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Mkhayar K, Daoui O, Haloui R, Elkhattabi K, Elabbouchi A, Chtita S, Samadi A, Elkhattabi S. Ligand-Based Design of Novel Quinoline Derivatives as Potential Anticancer Agents: An In-Silico Virtual Screening Approach. Molecules 2024; 29:426. [PMID: 38257339 PMCID: PMC10819159 DOI: 10.3390/molecules29020426] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2023] [Revised: 01/03/2024] [Accepted: 01/09/2024] [Indexed: 01/24/2024] Open
Abstract
In this study, using the Comparative Molecular Field Analysis (CoMFA) approach, the structure-activity relationship of 33 small quinoline-based compounds with biological anti-gastric cancer activity in vitro was analyzed in 3D space. Once the 3D geometric and energy structure of the target chemical library has been optimized and their steric and electrostatic molecular field descriptions computed, the ideal 3D-QSAR model is generated and matched using the Partial Least Squares regression (PLS) algorithm. The accuracy, statistical precision, and predictive power of the developed 3D-QSAR model were confirmed by a range of internal and external validations, which were interpreted by robust correlation coefficients (RTrain2=0.931; Qcv2=0.625; RTest2=0.875). After carefully analyzing the contour maps produced by the trained 3D-QSAR model, it was discovered that certain structural characteristics are beneficial for enhancing the anti-gastric cancer properties of Quinoline derivatives. Based on this information, a total of five new quinoline compounds were developed, with their biological activity improved and their drug-like bioavailability measured using POM calculations. To further explore the potential of these compounds, molecular docking and molecular dynamics simulations were performed in an aqueous environment for 100 nanoseconds, specifically targeting serine/threonine protein kinase. Overall, the new findings of this study can serve as a starting point for further experiments with a view to the identification and design of a potential next-generation drug for target therapy against cancer.
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Affiliation(s)
- Khaoula Mkhayar
- Laboratory of Engineering, Systems and Applications, National School of Applied Sciences, Sidi Mohamed Ben Abdellah-Fez University, Fez 30000, Morocco; (K.M.); (O.D.); (R.H.)
| | - Ossama Daoui
- Laboratory of Engineering, Systems and Applications, National School of Applied Sciences, Sidi Mohamed Ben Abdellah-Fez University, Fez 30000, Morocco; (K.M.); (O.D.); (R.H.)
| | - Rachid Haloui
- Laboratory of Engineering, Systems and Applications, National School of Applied Sciences, Sidi Mohamed Ben Abdellah-Fez University, Fez 30000, Morocco; (K.M.); (O.D.); (R.H.)
| | - Kaouakeb Elkhattabi
- Laboratory for Oral Biology and Biotechnology Research, Department of Fundamental Sciences, Faculty of Medicine Dentistry, Mohammed V University, Rabat 10106, Morocco;
| | - Abdelmoula Elabbouchi
- Euromed Research Center, Euromed Faculty of Pharmacy, Euromed University of Fes (UEMF), Meknes Road, Fez 30000, Morocco;
| | - Samir Chtita
- Laboratory of Analytical and Molecular Chemistry, Faculty of Sciences Ben M’Sik, Hassan II University of Casablanca, Casablanca P.O. Box 7955, Morocco;
| | - Abdelouahid Samadi
- Department of Chemistry, College of Science, United Arab Emirates University, Al Ain P.O. Box 15551, United Arab Emirates
| | - Souad Elkhattabi
- Laboratory of Engineering, Systems and Applications, National School of Applied Sciences, Sidi Mohamed Ben Abdellah-Fez University, Fez 30000, Morocco; (K.M.); (O.D.); (R.H.)
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Abouelenein MG, El-Rashedy AA, Awad HM, El Farargy AF, Nassar IF, Nassrallah A. Synthesis, molecular modeling Insights, and anticancer assessment of novel polyfunctionalized Pyridine congeners. Bioorg Chem 2023; 141:106910. [PMID: 37871393 DOI: 10.1016/j.bioorg.2023.106910] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2023] [Revised: 09/26/2023] [Accepted: 10/06/2023] [Indexed: 10/25/2023]
Abstract
The present study describes synthesizing a novel series of polyfunctionalized pyridine congeners 1-18 and assessed for cytotoxic efficacies versus HCT-116, MCF-7, and HepG-2 among one non-cancerous BJ-1 human normal cell. Most compounds were precisely potent anticancer candidate drugs. The molecular impact of the most active compounds 9, 10, 11, 13, 15, and 17 was evaluated after MCF-7 treatment. The gene expression of pro- and ant-apoptosis markers P53, Bax, Caspase-3 and Bcl-2 as well as VEGFR-2 and HER2 were determined. Compounds 13 and 15 induced upregulation of pro-apoptosis of P53, Bax, Caspase-3 and downregulation of anti-apoptosis Bcl-2 gene. However, compound 15 showed higher effect compared to 13 and respective control. Moreover, a slight reduction in HER2 gene expression was detected due to compound 15 treatment, while VEGFR-2 gene was upregulated. In agreement, the immunoblotting analysis showed higher accumulation of P53, Bax, Caspase-3 proteins and of decrease the Bcl-2 protein levels. Furthermore, docking studies united with molecular dynamic simulation exposed compounds 13 and 15 fitting in the middle of the active site at the interface linking the ATP binding site and the allosteric hydrophobic binding pocket. Finally, we performed Petra/Osiris/ Molinspiration (POM) analysis for the newly synthesized compounds. The evaluation of primary in silico parameters revealed significant differences among individual polyfunctionalized pyridine compounds, highlighting the most promising candidates. These preliminary results may help in coordinating and initiating other research projects focused on polyfunctionalized pyridine compounds, especially those with predicted bioactivity, low toxicity, optimal ADME parameters, and promising perspectives.
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Affiliation(s)
- Mohamed G Abouelenein
- Chemistry Department, Faculty of Science, Menofia University, Shebin El-Koam, Menofia, Egypt.
| | - Ahmed A El-Rashedy
- Natural and Microbial Products Department, National Research Center (NRC), Egypt
| | - Hanem M Awad
- Department of Tanning Materials and Leather Technology, Chemical Industries Research Institute, National Research Centre (NRC), Egypt
| | - Ahmed F El Farargy
- Department of Chemistry, Faculty of Science, Zagazig University, Zagazig 44519, Egypt
| | - Ibrahim F Nassar
- Faculty of Specific Education, Ain Shams University, Abassia, Cairo, Egypt
| | - Amr Nassrallah
- Basic Applied Science Institute, Egypt-Japan University of Science and Technology (E-JUST) P.O. Box 179, New Borg El-Arab City Postal Code 21934, Alexandria, Egypt; Biochemistry Department, Faculty of Agriculture, Cairo University, 12613 Giza, Egypt
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Yue Z, Wang R, Li J, Tang M, Yang L, Gu H, Wang X, Sun T. Recent Advances in Polyoxometalate Based Nanoplatforms Mediated Reactive Oxygen Species Cancer Therapy. Chem Asian J 2023; 18:e202300749. [PMID: 37755123 DOI: 10.1002/asia.202300749] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2023] [Revised: 09/25/2023] [Accepted: 09/25/2023] [Indexed: 09/28/2023]
Abstract
The potential of reactive oxygen species (ROS) cancer therapy in tumor treatment has been greatly enhanced by the introduction of catalytically superior polyoxometalate (POM)-based nanoplatforms, mainly composed of atomic clusters consisting of pre-transition metals and oxygen. These nanoplatforms have unique advantages, such as Fenton activity at neutral pH, induction of cellular ferroptosis instead of just apoptosis, and sensitivity to external field stimulation. However, there are also inevitable challenges such as neutralization of ROS by the antioxidant system of the tumor microenvironment (TME), hypoxia, and limited hydrogen peroxide concentrations. This review article aims to provide an overview of recent research advancements in POM-based nanoplatforms for ROS therapy from the perspective of chemical reactions and biological processes, addressing endogenous and exogenous factors that affect the antitumor efficacy. Endogenous factors include the mechanism of ROS generation by POM, the impact of pH and antioxidant systems on POM, and the various manners of tumor cell death. Exogenous stimuli mainly include light, heat, X-rays, and electricity. The article analyzes the specific mechanisms of action of each influencing factor in the first two sections, concluding with the limitations of the present study and some possible directions for future research.
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Affiliation(s)
- Zhengya Yue
- College of Chemistry, Chemical Engineering, and Resource Utilization, Northeast Forestry University, Harbin, 150040, PR China
| | - Runjie Wang
- College of Chemistry, Chemical Engineering, and Resource Utilization, Northeast Forestry University, Harbin, 150040, PR China
| | - Jialun Li
- College of Chemistry, Chemical Engineering, and Resource Utilization, Northeast Forestry University, Harbin, 150040, PR China
| | - Minglu Tang
- College of Chemistry, Chemical Engineering, and Resource Utilization, Northeast Forestry University, Harbin, 150040, PR China
| | - Li Yang
- College of Chemistry, Chemical Engineering, and Resource Utilization, Northeast Forestry University, Harbin, 150040, PR China
| | - Hao Gu
- College of Chemistry, Chemical Engineering, and Resource Utilization, Northeast Forestry University, Harbin, 150040, PR China
| | - Xijin Wang
- The First Psychiatric Hospital of Harbin, Hongwei Road, Harbin, 150040, PR China
| | - Tiedong Sun
- College of Chemistry, Chemical Engineering, and Resource Utilization, Northeast Forestry University, Harbin, 150040, PR China
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Kawsar SMA, Munia NS, Saha S, Ozeki Y. In Silico Pharmacokinetics, Molecular Docking and Molecular Dynamics Simulation Studies of Nucleoside Analogs for Drug Discovery- A Mini Review. Mini Rev Med Chem 2023; 24:MRMC-EPUB-136050. [PMID: 37957918 DOI: 10.2174/0113895575258033231024073521] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2023] [Revised: 08/26/2023] [Accepted: 09/22/2023] [Indexed: 11/15/2023]
Abstract
Nucleoside analogs have been widely used as antiviral, antitumor, and antiparasitic agents due to their ability to inhibit nucleic acid synthesis. Adenosine, cytidine, guanosine, thymidine and uridine analogs such as didanosine, vidarabine, remdesivir, gemcitabine, lamivudine, acyclovir, abacavir, zidovusine, stavudine, and idoxuridine showed remarkable anticancer and antiviral activities. In our previously published articles, our main intention was to develop newer generation nucleoside analogs with acylation-induced modification of the hydroxyl group and showcase their biological potencies. In the process of developing nucleoside analogs, in silico studies play an important role and provide a scientific background for biological data. Molecular interactions between drugs and receptors followed by assessment of their stability in physiological environments, help to optimize the drug development process and minimize the burden of unwanted synthesis. Computational approaches, such as DFT, FMO, MEP, ADMET prediction, PASS prediction, POM analysis, molecular docking, and molecular dynamics simulation, are the most popular tools to culminate all preclinical study data and deliver a molecule with maximum bioactivity and minimum toxicity. Although clinical drug trials are crucial for providing dosage recommendations, they can only indirectly provide mechanistic information through researchers for pathological, physiological, and pharmacological determinants. As a result, in silico approaches are increasingly used in drug discovery and development to provide mechanistic information of clinical value. This article portrays the current status of these methods and highlights some remarkable contributions to the development of nucleoside analogs with optimized bioactivity.
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Affiliation(s)
- Sarkar M A Kawsar
- Laboratory of Carbohydrate and Nucleoside Chemistry (LCNC), Department of Chemistry, Faculty of Science, University of Chittagong, Chittagong-4331, Bangladesh
| | - Nasrin S Munia
- Laboratory of Carbohydrate and Nucleoside Chemistry (LCNC), Department of Chemistry, Faculty of Science, University of Chittagong, Chittagong-4331, Bangladesh
| | - Supriyo Saha
- Uttaranchal Institute of Pharmaceutical Sciences, Uttaranchal University, Premnagar-248007, Dehradun, Uttarakhand-248007, India
| | - Yasuhiro Ozeki
- School of Sciences, Yokohama City University, 22- 2, Seto, Kanazawa-ku, Yokohama 236-0027, Japan
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Suleiman M, Almalki FA, Ben Hadda T, Kawsar SMA, Chander S, Murugesan S, Bhat AR, Bogoyavlenskiy A, Jamalis J. Recent Progress in Synthesis, POM Analyses and SAR of Coumarin-Hybrids as Potential Anti-HIV Agents-A Mini Review. Pharmaceuticals (Basel) 2023; 16:1538. [PMID: 38004404 PMCID: PMC10675815 DOI: 10.3390/ph16111538] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2023] [Revised: 10/18/2023] [Accepted: 10/27/2023] [Indexed: 11/26/2023] Open
Abstract
The human immunodeficiency virus (HIV) is the primary cause of acquired immune deficiency syndrome (AIDS), one of the deadliest pandemic diseases. Various mechanisms and procedures have been pursued to synthesise several anti-HIV agents, but due to the severe side effects and multidrug resistance spawning from the treatment of HIV/AIDS using highly active retroviral therapy (HAART), it has become imperative to design and synthesise novel anti-HIV agents. Literature has shown that natural sources, particularly the plant kingdom, can release important metabolites that have several biological, mechanistic and structural representations similar to chemically synthesised compounds. Certainly, compounds from natural and ethnomedicinal sources have proven to be effective in the management of HIV/AIDS with low toxicity, fewer side effects and affordability. From plants, fungi and bacteria, coumarin can be obtained, which is a secondary metabolite and is well known for its actions in different stages of the HIV replication cycle: protease, integrase and reverse transcriptase (RT) inhibition, cell membrane fusion and viral host attachment. These, among other reasons, are why coumarin moieties will be the basis of a good building block for the development of potent anti-HIV agents. This review aims to outline the synthetic pathways, structure-activity relationship (SAR) and POM analyses of coumarin hybrids with anti-HIV activity, detailing articles published between 2000 and 2023.
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Affiliation(s)
- Mustapha Suleiman
- Department of Chemistry, Faculty of Science, Universiti Teknologi Malaysia, Johor Bahru 81310, Johor, Malaysia;
- Department of Chemistry, Sokoto State University, Birnin Kebbi Road, Sokoto 852101, Nigeria
| | - Faisal A. Almalki
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy, Umm Al-Qura University, Mecca 21955, Saudi Arabia; (F.A.A.); (T.B.H.)
| | - Taibi Ben Hadda
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy, Umm Al-Qura University, Mecca 21955, Saudi Arabia; (F.A.A.); (T.B.H.)
- Laboratory of Applied Chemistry & Environment, Faculty of Sciences, Mohammed Premier University, MB 524, Oujda 60000, Morocco
| | - Sarkar M. A. Kawsar
- Laboratory of Carbohydrate and Nucleoside Chemistry, Department of Chemistry, University of Chittagong, Chittagong 4331, Bangladesh;
| | - Subhash Chander
- Amity Institute of Phytochemistry & Phytomedicine, Amity University Uttar Pradesh, Noida 201313, India;
| | - Sankaranarayanan Murugesan
- Medicinal Chemistry Research Laboratory, Birla Institute of Technology & Science Pilani (BITS Pilani), Pilani Campus, Pilani 333031, India;
| | - Ajmal R. Bhat
- Department of Chemistry, R.T.M. Nagpur University, Nagpur 440033, India;
| | - Andrey Bogoyavlenskiy
- Research and Production Center for Microbiology and Virology, Almaty 050010, Kazakhstan
| | - Joazaizulfazli Jamalis
- Department of Chemistry, Faculty of Science, Universiti Teknologi Malaysia, Johor Bahru 81310, Johor, Malaysia;
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Tjendra Y, Kerr DA, Zuo Y, Menendez SG, Jorda M, Gomez-Fernandez C, Velez Torres JM. Probability of malignancy and molecular alterations as determined by ThyroSeq v3 genomic classifier in Bethesda Category IV. Cancer Cytopathol 2023; 131:586-595. [PMID: 37358081 DOI: 10.1002/cncy.22737] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2023] [Revised: 05/21/2023] [Accepted: 05/22/2023] [Indexed: 06/27/2023]
Abstract
BACKGROUND ThyroSeq molecular testing assesses the probability of malignancy (POM) in thyroid fine-needle aspiration cytology (FNAC) with indeterminate cytology. The aim was to investigate whether Bethesda category IV (BIV) subcategories are associated with specific molecular alterations, molecular-derived risk of malignancy (MDROM), and risk of malignancy (ROM). METHODS FNAC slides, associated ThyroSeq, version 3, Genomic Classifier results, and surgical follow-up were retrieved for BIV nodules. Nodules were subcategorized as follicular neoplasm (FN) with or without cytologic atypia or oncocytic follicular neoplasm (OFN). The MDROM, ROM, and frequency of molecular alterations in FN and OFN were analyzed. p < .05 was considered significant. RESULTS A total of 92 FNAC were identified and subcategorized into 46 FN (15 with and 31 without cytologic atypia) and 46 OFN. The benign call rate and the positive call rate were 49% and 51%, respectively. The MDROM in BIV was 34.3%, trending lower in OFN than in FN. RAS mutations were significantly more frequent in FN when compared to OFN (p = .02). Chromosomal copy number alterations were more often present in OFN than in FN (p < .01). On histologic follow-up, ROM in OFN was trending lower than in FN (p = .1). The most common diagnosis in OFN was oncocytic adenoma, whereas follicular variant papillary thyroid carcinoma was most common in FN. CONCLUSIONS The MDROM and ROM were trending lower in OFN compared with FN, and the molecular alterations differed between OFN and FN subcategories.
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Affiliation(s)
- Youley Tjendra
- Department of Pathology and Laboratory Medicine, University of Miami Miller School of Medicine, Miami, Florida, USA
| | - Darcy A Kerr
- Department of Pathology and Laboratory Medicine, Dartmouth-Hitchcock Medical Center, Lebanon, New Hampshire, USA
- Geisel School of Medicine at Dartmouth, Hanover, New Hampshire, USA
| | - Yiqin Zuo
- Department of Pathology and Laboratory Medicine, University of Miami Miller School of Medicine, Miami, Florida, USA
| | - Silvia Gra Menendez
- Department of Medicine, Division of Endocrinology, Diabetes, and Metabolism, University of Miami Miller School of Medicine, Miami, Florida, USA
| | - Merce Jorda
- Department of Pathology and Laboratory Medicine, University of Miami Miller School of Medicine, Miami, Florida, USA
| | - Carmen Gomez-Fernandez
- Department of Pathology and Laboratory Medicine, University of Miami Miller School of Medicine, Miami, Florida, USA
| | - Jaylou M Velez Torres
- Department of Pathology and Laboratory Medicine, University of Miami Miller School of Medicine, Miami, Florida, USA
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Bončina T, Glodež S, Polanec B, Hočuršćak L, Zupanič F. Comprehensive Analysis of Different Coating Materials on the POM Substrate. Materials (Basel) 2023; 16:4365. [PMID: 37374549 DOI: 10.3390/ma16124365] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/22/2023] [Revised: 06/06/2023] [Accepted: 06/08/2023] [Indexed: 06/29/2023]
Abstract
This study presents a comprehensive analysis of different coating materials on the POM substrate. Specifically, it investigated physical vapour deposition (PVD) coatings of aluminium (Al), chromium (Cr), and chromium nitride (CrN) of three various thicknesses. The deposition of Al was accomplished through a three-step process, particularly plasma activation, metallisation of Al by magnetron sputtering, and plasma polymerisation. The deposition of Cr was attained using the magnetron sputtering technique in a single step. For the deposition of CrN, a two-step process was employed. The first step involved the metallisation of Cr using magnetron sputtering, while the second step involved the vapour deposition of CrN, obtained through the reactive metallisation of Cr and nitrogen using magnetron sputtering. The focus of the research was to conduct comprehensive indentation tests to obtain the surface hardness of the analysed multilayer coatings, SEM analyses to examine surface morphology, and thorough adhesion analyses between the POM substrate and the appropriate PVD coating.
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Affiliation(s)
- Tonica Bončina
- Faculty of Mechanical Engineering, University of Maribor, Smetanova 17, 2000 Maribor, Slovenia
| | - Srečko Glodež
- Faculty of Mechanical Engineering, University of Maribor, Smetanova 17, 2000 Maribor, Slovenia
| | - Brigita Polanec
- Faculty of Mechanical Engineering, University of Maribor, Smetanova 17, 2000 Maribor, Slovenia
| | - Lara Hočuršćak
- Faculty of Mechanical Engineering, University of Maribor, Smetanova 17, 2000 Maribor, Slovenia
| | - Franc Zupanič
- Faculty of Mechanical Engineering, University of Maribor, Smetanova 17, 2000 Maribor, Slovenia
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Ripatti L, Viljamaa HR, Suihko A, Pakkasjärvi N. High-pressure balloon dilatation of primary obstructive megaureter in children: a systematic review. BMC Urol 2023; 23:30. [PMID: 36869342 DOI: 10.1186/s12894-023-01199-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2022] [Accepted: 02/24/2023] [Indexed: 03/05/2023] Open
Abstract
OBJECTIVE We aimed to evaluate the effectiveness and complication rates of endoscopic high-pressure balloon dilatation (HPBD) in treating primary obstructive megaureter (POM) in children based on current literature. Specifically, we wanted to clarify the evidence on the use of HPBD in children under one year of age. METHODS A systematic search of the literature was performed via several databases. The preferred reporting items for systematic reviews and meta-analyses guidelines were followed. The primary outcomes studied in this systematic review were the effectiveness of HBPD in relieving obstruction and reducing hydroureteronephrosis in children. The secondary outcome was to study the complication rate of endoscopic high-pressure balloon dilatation. Studies that reported one or both of these outcomes (n = 13) were considered eligible for inclusion in this review. RESULTS HPBD significantly decreased both ureteral diameter (15.8 mm [range 2-30] to 8.0 mm [0-30], p = 0.00009) and anteroposterior diameter of renal pelvis (16.7 mm [0-46] to 9.7 mm [0-36], p = 0.00107). The success rate was 71% after one HPBD and 79% after two HPBD. The median follow-up time was 3.6 years (interquartile range 2.2-6.4 years). A complication rate of 33% was observed, but no Clavien-Dindo grade IV-V complications were reported. Postoperative infections and VUR were detected in 12% and 7.8% of cases, respectively. For children under one year of age, outcomes of HPBD seem to be similar to those in older children. CONCLUSIONS This study indicates that HPBD appears to be safe and can be used as the first-line treatment for symptomatic POM. Further comparative studies are needed addressing the effect of treatment in infants, and also long-term outcomes of the treatment. Due to the nature of POM, identifying those patients who will benefit from HPBD remains challenging.
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Derrien D, Barré P, Basile-Doelsch I, Cécillon L, Chabbi A, Crème A, Fontaine S, Henneron L, Janot N, Lashermes G, Quénéa K, Rees F, Dignac MF. Current controversies on mechanisms controlling soil carbon storage: implications for interactions with practitioners and policy-makers. A review. Agron Sustain Dev 2023; 43:21. [PMID: 36777236 PMCID: PMC9901420 DOI: 10.1007/s13593-023-00876-x] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 01/16/2023] [Indexed: 06/17/2023]
Abstract
There is currently an intense debate about the potential for additional organic carbon storage in soil, the strategies by which it may be accomplished and what the actual benefits might be for agriculture and the climate. Controversy forms an essential part of the scientific process, but on the topic of soil carbon storage, it may confuse the agricultural community and the general public and may delay actions to fight climate change. In an attempt to shed light on this topic, the originality of this article lies in its intention to provide a balanced description of contradictory scientific opinions on soil carbon storage and to examine how the scientific community can support decision-making despite the controversy. In the first part, we review and attempt to reconcile conflicting views on the mechanisms controlling organic carbon dynamics in soil. We discuss the divergent opinions about chemical recalcitrance, the microbial or plant origin of persistent soil organic matter, the contribution of particulate organic matter to additional organic carbon storage in soil, and the spatial and energetic inaccessibility of soil organic matter to decomposers. In the second part, we examine the advantages and limitations of big data management and modeling, which are essential tools to link the latest scientific theories with the actions taken by stakeholders. Finally, we show how the analysis and discussion of controversies can guide scientists in supporting stakeholders for the design of (i) appropriate trade-offs for biomass use in agriculture and forestry and (ii) climate-smart management practices, keeping in mind their still unresolved effects on soil carbon storage.
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Affiliation(s)
| | - Pierre Barré
- Laboratoire de Géologie, École Normale Supérieure, CNRS, PSL University, IPSL, Paris, France
| | | | - Lauric Cécillon
- Laboratoire de Géologie, École Normale Supérieure, CNRS, PSL University, IPSL, Paris, France
| | - Abad Chabbi
- UMR EcoSys, INRAE, AgroParisTech, Université Paris-Saclay, 78850 Thiverval-Grignon, France
| | - Alexandra Crème
- UMR EcoSys, INRAE, AgroParisTech, Université Paris-Saclay, 78850 Thiverval-Grignon, France
| | - Sébastien Fontaine
- Université Clermont Auvergne, INRAE, VetAgro Sup, UMR Ecosystème Prairial, 63000 Clermont-Ferrand, France
| | - Ludovic Henneron
- USC ECODIV-Rouen 7603, Normandie Université, UNIROUEN, INRAE, 76000 Rouen, France
| | - Noémie Janot
- ISPA, Bordeaux Sciences Agro, INRAE, F-33140 Villenave d’Ornon, France
| | - Gwenaëlle Lashermes
- Université de Reims Champagne Ardenne, INRAE, FARE, UMR A 614, 51097 Reims, France
| | - Katell Quénéa
- Sorbonne Université, CNRS, EPHE, PSL, UMR METIS, F-75005 Paris, France
| | - Frédéric Rees
- UMR EcoSys, INRAE, AgroParisTech, Université Paris-Saclay, 78850 Thiverval-Grignon, France
| | - Marie-France Dignac
- INRAE, CNRS, Sorbonne Université, UMR iEES-Paris, 4 place Jussieu, 75005 Paris, France
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Liu X, Luo Y, Zhang H, Wu J, Zhu R, Wang H. Spatial heterogeneity of particulate organic matter for the sorption of ciprofloxacin at the microstructure scale. Sci Total Environ 2022; 847:157326. [PMID: 35850335 DOI: 10.1016/j.scitotenv.2022.157326] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/05/2022] [Revised: 07/08/2022] [Accepted: 07/09/2022] [Indexed: 06/15/2023]
Abstract
Particulate organic matter (POM) is a major antibiotic sorbent of the active soil organic carbon pool. Until now, the spatial heterogeneity of POM for ciprofloxacin (CFC) sorption at the microstructure scale has not been quantified. To our knowledge, this is the first study that combines a batch sorption experiment, NanoSIMS, and a 13C isotopic tracer to expound the distribution characteristics of CFC and the dominant sorption components of POM. Four POMs separated from soils (wetland, oil waste field, and farmlands) were utilized to study the sorption mechanisms using batch experiments. POM separated from the wetland was utilized for further study at the microstructure scale. The results revealed that the POM had a great CFC sorption capacity ranging from 65.20 mg g-1 to 77.51 mg g-1. Both the kinetics and NanoSIMS results showed that the sorption mechanisms included surface distribution and intra-particle diffusion. The microstructural distribution characteristics exhibited a marginal accumulation tendency and a surface accumulation effect. A combination of the NanoSIMS with the pH and salinity results explained that CFC adsorption was dominated by the organic components of POM. Overall, the present study demonstrates that the characteristics and organic components of the POM played a decisive role in the CFC-POM interactions. This study provides the first evidence of the vector potential of CFC rereleased into the environment during the POM turnover process.
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Affiliation(s)
- Xinghua Liu
- Institute of Animal Science and Veterinary Medicine Shandong Academy of Agricultural Sciences, Key Laboratory of Livestock Disease Control and Breeding, Jinan 250100, China; Key Laboratory of Livestock and Poultry Multi-omics of MARA, China
| | - Yongming Luo
- Institute of Soil Science, Chinese Academy of Sciences, Key Laboratory of Soil Environment and Pollution Remediation, Nanjing 210008, China
| | - Haibo Zhang
- Key Laboratory of Soil Contamination Bioremediation of Zhejiang Province, School of Environmental and Resource Sciences, Zhejiang A & F University, Hangzhou 311300, China.
| | - Jiaqiang Wu
- Institute of Animal Science and Veterinary Medicine Shandong Academy of Agricultural Sciences, Key Laboratory of Livestock Disease Control and Breeding, Jinan 250100, China; Key Laboratory of Livestock and Poultry Multi-omics of MARA, China
| | - Rongsheng Zhu
- Institute of Animal Science and Veterinary Medicine Shandong Academy of Agricultural Sciences, Key Laboratory of Livestock Disease Control and Breeding, Jinan 250100, China; Key Laboratory of Livestock and Poultry Multi-omics of MARA, China
| | - Huaizhong Wang
- Institute of Animal Science and Veterinary Medicine Shandong Academy of Agricultural Sciences, Key Laboratory of Livestock Disease Control and Breeding, Jinan 250100, China; Key Laboratory of Livestock and Poultry Multi-omics of MARA, China
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11
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Baruah B, Phillips GD, Ferreira DR, Boone NJ, Mcnutt DA. Comparing Cs + binding affinity of Keggin type polyoxometalate and sodium Tetrakis(4-florophenyl)borate in solution and from Cs-doped pure phase vermiculite. J Environ Radioact 2022; 253-254:107008. [PMID: 36095854 DOI: 10.1016/j.jenvrad.2022.107008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/08/2022] [Revised: 08/18/2022] [Accepted: 08/30/2022] [Indexed: 06/15/2023]
Abstract
We assessed the aptitude of cesium (Cs+) binding by Keggin type polyoxometalates (POMs) and compared the results with the Cs+ binding by sodium tetrakis(4-fluorophenyl)-borate (Na-TFPB). In this work, we aimed to establish a system to treat radioactive Cs+ contaminated soil with POMs economically. We evaluated the effect of initial Cs+ concentration (0.1M) and precipitant (POMs and TFPB) concentrations (0.01M) on Cs+ precipitation. Our comparison of Cs+ precipitation by three different POMs and TFPB was obtained by Inductively Coupled Plasma Optical Emission Spectroscopy (ICP-OES). We synthesized POMs molybdovanadophosphoric acid, H5PMo10V2O40 (MVPA), and silicotungstic acid, H4SiW12O40 (STA), and used commercially available phosphotungstic acid, H3PW12O40 (PTA), and TFPB. Cs-doped pure phase vermiculite was also used to demonstrate the extraction potential of Cs+ by TFPB, STA, and PTA. All the POMs and corresponding Cs-bound POMs were characterized by UV-visible spectroscopy, Fourier-transform infrared spectroscopy (FTIR), Raman spectroscopy, and X-ray powder diffraction (XRD). In this simulation study, we demonstrated that the Cs+ removal by POMs is much more effective than TFPB and could be a promising method for the treatment of radiocesium contaminated soil.
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Affiliation(s)
- Bharat Baruah
- Department of Chemistry and Biochemistry, Kennesaw State University, Kennesaw, GA, 30144-5591, USA.
| | - Grayson D Phillips
- Department of Chemistry and Biochemistry, Kennesaw State University, Kennesaw, GA, 30144-5591, USA
| | - Daniel R Ferreira
- Department of Ecology, Evolution, & Organismal Biology Kennesaw State University, Kennesaw, GA, 30144, USA
| | - Nathan J Boone
- Department of Chemistry and Biochemistry, Kennesaw State University, Kennesaw, GA, 30144-5591, USA
| | - Derek A Mcnutt
- Department of Ecology, Evolution, & Organismal Biology Kennesaw State University, Kennesaw, GA, 30144, USA
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12
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Kalita P, Singh RK, Bhattacharjee A. Interactions of a biological macromolecule with thermotropic liquid crystals: Applications of liquid crystals in biosensing platform. Spectrochim Acta A Mol Biomol Spectrosc 2022; 278:121347. [PMID: 35550995 DOI: 10.1016/j.saa.2022.121347] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/17/2022] [Revised: 04/08/2022] [Accepted: 05/01/2022] [Indexed: 06/15/2023]
Abstract
Liquid crystal biosensor was developed based on a 4'-octyl-4-biphenylcarbonitrile (8CB) by adsorption of biological macromolecule bovine serum albumin (BSA) at the 8CB interface. BSA was detected by examining the changes in the director configurations of 8CB molecules under a polarizing optical microscope. The transitions in the director configuration were due to the non-covalent bonds. This technique demonstrated high sensitivity at a concentration of 100 µM of BSA. The binding events between the 8CB and BSA were investigated through molecular docking studies that confirmed the protein-ligand interaction. The most probable binding location of 8CB to dock with BSA were determined at a subdomain IB of Sudlow's site I. The active residues on analyzing were found to stabilize the 8CB molecules through different interactions. These active residues that were involved in the protein-ligand interaction were further confirmed with Raman spectroscopy. This study provided the vibrational properties and structural changes that occurred due to the various interactions between the 8CB and BSA. The results presented in this work lead to a potential biosensing tool for detecting and sensing proteins using LCs.
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Affiliation(s)
- Priyanki Kalita
- Department of Physics, National Institute of Technology Meghalaya, Bijni Complex, Shillong 793003, India
| | - Ranjan K Singh
- Department of Physics, Banaras Hindu University, Varanasi, Uttar Pradesh 221005, India
| | - Ayon Bhattacharjee
- Department of Physics, National Institute of Technology Meghalaya, Bijni Complex, Shillong 793003, India.
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13
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Munia NS, Hosen MA, Azzam KMA, Al-Ghorbani M, Baashen M, Hossain MK, Ali F, Mahmud S, Shimu MSS, Almalki FA, Hadda TB, Laaroussi H, Naimi S, Kawsar SMA. Synthesis, antimicrobial, SAR, PASS, molecular docking, molecular dynamics and pharmacokinetics studies of 5'- O-uridine derivatives bearing acyl moieties: POM study and identification of the pharmacophore sites. Nucleosides Nucleotides Nucleic Acids 2022; 41:1036-1083. [PMID: 35797068 DOI: 10.1080/15257770.2022.2096898] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/22/2022] [Revised: 06/08/2022] [Accepted: 06/27/2022] [Indexed: 06/15/2023]
Abstract
Because of their superior antibacterial and pharmacokinetic capabilities, many nucleoside-based esters show potential against microorganisms, and may be used as pharmacological agents to address multidrug-resistant pathogenic problems. In this study, several aliphatic and aromatic groups were inserted to synthesize various 5'-O-decanoyluridine (2-5) and 5'-O-lauroyluridine derivatives (6-7) for antimicrobial, in silico computational, pharmacokinetic and POM (Petra/Osiris/Molinspiration). The chemical structures of the synthesized uridine derivatives were confirmed by physicochemical, elemental, and spectroscopic analyses. In vitro antimicrobial screening against five bacteria and two fungi, as well as the prediction of substance activity spectra (PASS), revealed that these uridine derivatives have promising antifungal properties when compared to the antibacterial activities. Density functional theory (DFT) was used to calculate the thermodynamic and physicochemical properties. Molecular docking was conducted against lanosterol 14a-demethylase CYP51A1 (3JUV) and Aspergillus flavus (1R4U) and revealed binding affinities and non-covalent interactions with the target. Then, a 150 ns molecular dynamic simulation was performed to confirm the behavior of the complex structure formed by microbial protein under in silico physiological conditions to examine its stability over time, which revealed a stable conformation and binding pattern in a stimulating environment of uridine derivatives. The acyl chain {CH3(CH2)9CO-} and {CH3(CH2)10CO-} in conjunction with sugar, was determined to have the most potent activity against bacterial and fungal pathogens in a structure-activity relationships (SAR) investigation. POM analyses were conducted with the presence of an antifungal (O δ- -- O' δ-) pharmacophore site. Overall, the present study might be useful for the development of uridine-based novel multidrug-resistant antimicrobial.
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Affiliation(s)
- Nasrin S Munia
- Department of Chemistry, Faculty of Science, University of Chittagong, Chittagong, Bangladesh
| | - Mohammed A Hosen
- Department of Chemistry, Faculty of Science, University of Chittagong, Chittagong, Bangladesh
| | - Khaldun M A Azzam
- Pharmacological and Diagnostic Research Center (PDRC), Department of Pharmaceutical Sciences, Faculty of Pharmacy, Al-Ahliyya Amman University, Amman, Jordan
| | - Mohammed Al-Ghorbani
- Department of Chemistry, Faculty of Science and Arts, Ulla, Taibah University, Medina, Saudi Arabia
| | - Mohammed Baashen
- Department of Chemistry, Science and Humanities College, Shaqra University, Shaqra, KSA
| | - Mohammed K Hossain
- Department of Pharmacy, Faculty of Biological Science, University of Chittagong, Chittagong, Bangladesh
| | - Ferdausi Ali
- Department of Microbiology, Faculty of Biological Science, University of Chittagong, Chittagong, Bangladesh
| | - Shafi Mahmud
- Department of Genome Science, John Curtin School of Medical Research, Australian National University, Canberra, Australia
| | - Mst S S Shimu
- Microbiology Laboratory, Department of Genetic Engineering and Biotechnology, University of Rajshahi, Rajshahi, Bangladesh
| | - Faisal A Almalki
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy, Umm Al-Qura University, Makkah, Saudi Arabia
| | - Taibi B Hadda
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy, Umm Al-Qura University, Makkah, Saudi Arabia
- Laboratory of Applied Chemistry & Environment, Faculty of Sciences, Mohammed Premier University, Oujda, Morocco
| | - Hamid Laaroussi
- Laboratory of Applied Chemistry & Environment, Faculty of Sciences, Mohammed Premier University, Oujda, Morocco
| | - Souad Naimi
- Department of Biological Sciences, Sanofi-Aventis, Vitry, France
| | - Sarkar M A Kawsar
- Department of Chemistry, Faculty of Science, University of Chittagong, Chittagong, Bangladesh
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14
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Su S, Li X, Zhang X, Zhu J, Liu G, Tan M, Wang Y, Luo M. Keggin-type SiW 12 encapsulated in MIL-101(Cr) as efficient heterogeneous photocatalysts for nitrogen fixation reaction. J Colloid Interface Sci 2022; 621:406-415. [PMID: 35472667 DOI: 10.1016/j.jcis.2022.04.006] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2022] [Revised: 03/31/2022] [Accepted: 04/01/2022] [Indexed: 10/18/2022]
Abstract
The incorporation of polyoxometalates (POMs) in metal-organic frameworks (MOFs) with host-guest structure have proven to be effective strategy to rational design of heterogeneous catalysis. In this study, the Keggin-type POM@MIL-101(Cr) composite catalysts (PMo12, PW12 and SiW12) are synthesized for nitrogen fixation reaction without sacrificial agents at room temperature in the first time. The SiW12 molecules are encapsulated in smaller cavities of MIL-101(Cr) by solvothermal method and in larger cavities by impregnation method, respectively. Solvothermal synthesized catalyst has a performance of 75.56 μmol·h-1·g-1cat and TOF value of 1.95 h-1, which are about 10 and 88 times than that of Na4SiW12O40. The excellent performance is ascribed to the synergistic effect of SiW12 and MIL-101(Cr). The MIL-101(Cr) adsorbs a large amount of N2 and generates sufficiently photogenerated electrons under sunlight irradiation, and electrons quickly transfer to the SiW12 through hydrogen bonds. Moreover, the agglomeration effect of the homogeneous catalyst SiW12 is weakened due to encapsulation with more exposed active sites. This work provides a feasible route to design and synthesize nanocomposite materials with exceptional performance for photocatalytic nitrogen fixation.
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Affiliation(s)
- Senda Su
- State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering, School of Chemistry and Chemical Engineering, Ningxia University, Yinchuan, Ningxia 750021, PR China
| | - Xiaoman Li
- State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering, School of Chemistry and Chemical Engineering, Ningxia University, Yinchuan, Ningxia 750021, PR China.
| | - Xu Zhang
- State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering, School of Chemistry and Chemical Engineering, Ningxia University, Yinchuan, Ningxia 750021, PR China
| | - Jingting Zhu
- International Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology of Ministry of Education Institute of Microscale Optoelectronics, Shenzhen University, Shenzhen 518060, PR China
| | - Guodong Liu
- State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering, School of Chemistry and Chemical Engineering, Ningxia University, Yinchuan, Ningxia 750021, PR China
| | - Mengyao Tan
- State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering, School of Chemistry and Chemical Engineering, Ningxia University, Yinchuan, Ningxia 750021, PR China
| | - Yingying Wang
- State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering, School of Chemistry and Chemical Engineering, Ningxia University, Yinchuan, Ningxia 750021, PR China
| | - Min Luo
- State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering, School of Chemistry and Chemical Engineering, Ningxia University, Yinchuan, Ningxia 750021, PR China.
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15
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Wytrych P, Utko J, Lis T, John Ł. Polyoxometalate-like structure of new potassium triphenylsiloxides: [K 6(OSiPh 3) 6(C 3H 7OH)(H 2O)]·2C 6H 5CH 3 and [K 6(OSiPh 3) 6(H 2O) 2]. Acta Crystallogr C 2021; 77:522-528. [PMID: 34482295 DOI: 10.1107/s2053229621008160] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2021] [Accepted: 08/09/2021] [Indexed: 11/10/2022] Open
Abstract
The synthesis and structural characterization of two new potassium triphenylsiloxides, namely, aqua(propan-2-ol)hexakis(triphenylsilanolato)hexapotassium toluene disolvate, [K6(C18H15OSi)6(C3H8O)(H2O)]·2C7H8, and diaquahexakis(triphenylsilanolato)hexapotassium, [K6(C18H15OSi)6(H2O)2], are reported. Both compounds crystallize in the triclinic space group P-1. The structure in each case resembles an alkali metal polyoxometalate-like structure, in which electrostatic interactions are observed in the metal-oxygen core. Furthermore, both compounds also resemble a reverse micelles-like architecture, in which the hydrophilic core is enclosed in a hydrophobic shell. The cores of the complexes are flanked by hydrophobic aromatic rings derived from Ph3SiO- anions, where intramolecular π-interactions between the aromatic rings and potassium cations stabilize the cores of the crystals. Moreover, in both structures, the presence of hydrogen bonds is observed; until now, no crystal structures have been described containing K atoms and triphenylsiloxide molecules in which the presence of hydrogen bonds was confirmed. Thus, these coordination entities could be considered as attractive reagents for further synthetic protocols towards heterometallic complexes.
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Affiliation(s)
- Patrycja Wytrych
- Faculty of Chemistry, University of Wrocław, 14 F. Joliot-Curie, 50-383 Wrocław, Poland
| | - Józef Utko
- Faculty of Chemistry, University of Wrocław, 14 F. Joliot-Curie, 50-383 Wrocław, Poland
| | - Tadeusz Lis
- Faculty of Chemistry, University of Wrocław, 14 F. Joliot-Curie, 50-383 Wrocław, Poland
| | - Łukasz John
- Faculty of Chemistry, University of Wrocław, 14 F. Joliot-Curie, 50-383 Wrocław, Poland
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16
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Sifaki K, Gumerova NI, Giester G, Rompel A. Synthesis and characterization of the Anderson-Evans tungstoantimonate [Na 5(H 2O) 18{(HOCH 2) 2CHNH 3} 2][SbW 6O 24]. Acta Crystallogr C Struct Chem 2021; 77:420-425. [PMID: 34216448 PMCID: PMC8254527 DOI: 10.1107/s2053229621006239] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2021] [Accepted: 06/16/2021] [Indexed: 11/11/2022] Open
Abstract
A novel tungstoantimonate, [Na5(H2O)18{(HOCH2)2CHNH3}2][SbVWVI6O24] (SbW6), was synthesized from an aqueous solution and structurally characterized by single-crystal X-ray diffraction, which revealed C2/c symmetry. The structure contains two serinol [(HOCH2)2CHNH3]+ and five Na+ cations, which are octahedrally surrounded by 18 water molecules, and one [SbVWVI6O24]7- anion. The serinol molecules also play a critical role in the synthesis by acting as a mild buffering agent. Each of the WVI and SbV ions is six-coordinated and displays a distorted octahedral motif. A three-dimensional supramolecular framework is formed via hydrogen-bonding interactions between the tungstoantimonates and cations. Powder X-ray diffraction, elemental analysis, thermogravimetric analysis and IR spectroscopy were performed on SbW6 to prove the purity, to identify the water content and to characterize the vibrational modes of the crystallized phase.
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Affiliation(s)
- Kleanthi Sifaki
- Universität Wien, Fakultät für Chemie, Institut für Biophysikalische Chemie, Althanstraße 14, 1090 Wien, Austria
| | - Nadiia I. Gumerova
- Universität Wien, Fakultät für Chemie, Institut für Biophysikalische Chemie, Althanstraße 14, 1090 Wien, Austria
| | - Gerald Giester
- Universität Wien, Fakultät für Geowissenschaften, Geographie und Astronomie, Institut für Mineralogie und Kristallographie, Althanstraße 14, 1090 Wien, Austria
| | - Annette Rompel
- Universität Wien, Fakultät für Chemie, Institut für Biophysikalische Chemie, Althanstraße 14, 1090 Wien, Austria
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17
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Gupta S, Das PP, Kula P, Parisi E, Centore R. Phase behaviour and crystal structures of 2',3'-difluorinated p-terphenyl derivatives. Acta Crystallogr C Struct Chem 2021; 77:435-440. [PMID: 34216450 DOI: 10.1107/s2053229621006367] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/30/2021] [Accepted: 06/18/2021] [Indexed: 11/10/2022]
Abstract
The crystal structures of difluorine derivatives of p-terphenyls (nTm) have been determined by single-crystal X-ray diffraction. For the unsymmetrical substituted compounds 2',3'-difluoro-4-methyl-p-terphenyl (1T0, C19H14F2) and 4-ethyl-2',3'-difluoro-4''-methyl-p-terphenyl (1T2, C21H18F2), the crystal structure is disordered, with molecules statistically entering the crystal in up and down orientations, with full superposition of all the atoms, except for those of the terminal groups (H/methyl for 1T0 and methyl/ethyl for 1T2). For triclinic 2',3'-difluoro-4,4''-dimethyl-p-terphenyl (1T1, C20H16F2), with the space group P-1, the two crystallographically independent molecules have the same conformation, which is different from monoclinic 1T0 (space group C2) and 1T2 (space group C2/c). A common feature of the conformation of the three compounds is the noncoplanar twisted arrangement of the three rings of the p-terphenyl moiety. Two-dimensional (2D) Hirshfeld fingerprint plots are consistent with H...H and C...H contacts in the crystal packing. For the three compounds, the phase behaviour has been investigated by POM (Petra/Osiris/Molinspiration) and differential scanning calorimetry (DSC) analysis. 1T2 is mesogenic, with enantiotropic nematic behaviour.
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Affiliation(s)
- Sakuntala Gupta
- Department of Physics, Raiganj University, Raiganj, Uttar Dinajpur, Pin 733134, W.B., India
| | - Partha Pratim Das
- Bhagilata High School (H.S.), Kantore, Raiganj, Uttar Dinajpur, Pin 733156, W.B., India
| | - Przemysław Kula
- Institute of Chemistry, Military University of Technology, Warsaw, Poland
| | - Emmanuele Parisi
- Department of Chemical Sciences, University of Naples Federico II, via Cintia, I-80126 Naples, Italy
| | - Roberto Centore
- Department of Chemical Sciences, University of Naples Federico II, via Cintia, I-80126 Naples, Italy
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18
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Liu Y, Zhang X, Gao Q, Huang H, Liu Y, Min M, Wang L. Structure and Properties of Polyoxymethylene/Silver/Maleic Anhydride-Grafted Polyolefin Elastomer Ternary Nanocomposites. Polymers (Basel) 2021; 13:1954. [PMID: 34208419 PMCID: PMC8231272 DOI: 10.3390/polym13121954] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2021] [Revised: 06/03/2021] [Accepted: 06/04/2021] [Indexed: 11/17/2022] Open
Abstract
In the present study, silver (Ag) nanoparticles and maleic anhydride-grafted polyolefin elastomer (MAH-g-POE) were used as enhancement additives to improve the performance of the polyoxymethylene (POM) homopolymer. Specifically, the POM/Ag/MAH-g-POE ternary nanocomposites with varying Ag nanoparticles and MAH-g-POE contents were prepared by a melt mixing method. The effects of the additives on the microstructure, thermal stability, crystallization behavior, mechanical properties, and dynamic mechanical thermal properties of the ternary nanocomposites were studied. It was found that the MAH-g-POE played a role in the bridging of the Ag nanoparticles and POM matrix and improved the interfacial adhesion between the Ag nanoparticles and POM matrix, owing to the good compatibility between Ag/MAH-g-POE and the POM matrix. Moreover, it was found that the combined addition of Ag nanoparticles and MAH-g-POE significantly enhanced the thermal stability, crystallization properties, and mechanical properties of the POM/Ag/MAH-g-POE ternary nanocomposites. When the Ag/MAH-g-POE content was 1 wt.%, the tensile strength reached the maximum value of 54.78 MPa. In addition, when the Ag/MAH-g-POE content increased to 15wt.%, the elongation at break reached the maximum value of 64.02%. However, when the Ag/MAH-g-POE content further increased to 20 wt.%, the elongation at break decreased again, which could be attributed to the aggregation of excessive Ag nanoparticles forming local defects in the POM/Ag/MAH-g-POE ternary nanocomposites. Furthermore, when the Ag/MAH-g-POE content was 20 wt.%, the maximum decomposition temperature of POM/Ag/MAH-g-POE ternary nanocomposites was 398.22 °C, which was 71.39 °C higher than that of pure POM. However, compared with POM, the storage modulus of POM/Ag/MAH-g-POE ternary nanocomposites decreased with the Ag/MAH-g-POE content, because the MAH-g-POE elastomer could reduce the rigidity of POM.
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Affiliation(s)
- Yang Liu
- Key Laboratory of Oceanic and Polar Fisheries, Ministry of Agriculture and Rural Affairs, East China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Shanghai 200090, China; (Y.L.); (X.Z.); (Q.G.); (H.H.); (Y.L.)
- Joint Laboratory for Open Sea Fishery Engineering, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266237, China
- Hunan Engineering Research Center for Rope & Net, Hunan Xinhai Co., Ltd., Yiyang 413100, China
| | - Xun Zhang
- Key Laboratory of Oceanic and Polar Fisheries, Ministry of Agriculture and Rural Affairs, East China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Shanghai 200090, China; (Y.L.); (X.Z.); (Q.G.); (H.H.); (Y.L.)
- Joint Laboratory for Open Sea Fishery Engineering, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266237, China
| | - Quanxin Gao
- Key Laboratory of Oceanic and Polar Fisheries, Ministry of Agriculture and Rural Affairs, East China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Shanghai 200090, China; (Y.L.); (X.Z.); (Q.G.); (H.H.); (Y.L.)
- College of Life Science, Huzhou University, Huzhou 313000, China
| | - Hongliang Huang
- Key Laboratory of Oceanic and Polar Fisheries, Ministry of Agriculture and Rural Affairs, East China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Shanghai 200090, China; (Y.L.); (X.Z.); (Q.G.); (H.H.); (Y.L.)
| | - Yongli Liu
- Key Laboratory of Oceanic and Polar Fisheries, Ministry of Agriculture and Rural Affairs, East China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Shanghai 200090, China; (Y.L.); (X.Z.); (Q.G.); (H.H.); (Y.L.)
| | - Minghua Min
- Key Laboratory of Oceanic and Polar Fisheries, Ministry of Agriculture and Rural Affairs, East China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Shanghai 200090, China; (Y.L.); (X.Z.); (Q.G.); (H.H.); (Y.L.)
- Joint Laboratory for Open Sea Fishery Engineering, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266237, China
| | - Lumin Wang
- Key Laboratory of Oceanic and Polar Fisheries, Ministry of Agriculture and Rural Affairs, East China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Shanghai 200090, China; (Y.L.); (X.Z.); (Q.G.); (H.H.); (Y.L.)
- Joint Laboratory for Open Sea Fishery Engineering, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266237, China
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19
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Pang YJ, Xu WS, Yang BT, Ni HY, Chen J. Influence of early thermal-oxidative ageing on the structure and properties of polyoxymethylene copolymer. R Soc Open Sci 2021; 8:210034. [PMID: 34113454 PMCID: PMC8188004 DOI: 10.1098/rsos.210034] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/19/2021] [Accepted: 04/30/2021] [Indexed: 06/12/2023]
Abstract
Thermal-oxidative ageing of polyoxymethylene (POM) copolymer in the oven at 100°C for 1, 2, 3, 5, 7, 10, 14 and 21 days and the influence of early thermal-oxidative ageing on POM structure and properties were studied by means of wide-angle X-ray diffraction, Fourier transform infrared spectroscopy, differential scanning calorimetry and tensile test. Based on the results, we found that the early thermal-oxidative ageing of POM copolymer can be divided into three regions. The region I is the initial 3 days. In this region, some molecular chains rearranged, resulting in internal stress relaxation, increase of crystallinity degree and grain size due to the perfection of crystal structure; both extended chain crystal (ECC) and folded chain crystal (FCC) increased and ECC grew faster than FCC. The region II is from 3 days to 10 days, and in this region, chain scission took place in amorphous region and led to chemi-crystallization. The region III is after 10 days. In this region, the structure and performance of POM copolymer reached a stable situation at this stage. In this work, the difference between skin and core were also analysed.
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Affiliation(s)
- Yuan-Jin Pang
- ShanDong Shinva Saraya Biotechnology Co., Ltd, People's Republic of China
| | - Wen-Shuai Xu
- ShanDong Shinva Saraya Biotechnology Co., Ltd, People's Republic of China
| | - Ben-Tengzi Yang
- Department of Polymer Processing and Engineering, College of Polymer Science and Engineering, Sichuan University, Chengdu, Sichuan 610065, People's Republic of China
| | - Hai-Ying Ni
- Department of Polymer Processing and Engineering, College of Polymer Science and Engineering, Sichuan University, Chengdu, Sichuan 610065, People's Republic of China
| | - Jun Chen
- Department of Polymer Processing and Engineering, College of Polymer Science and Engineering, Sichuan University, Chengdu, Sichuan 610065, People's Republic of China
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Chen WT. Crystal structure and photophysical properties of a novel polyoxomolybdate porphyrin. Acta Crystallogr C Struct Chem 2020; 76:1062-1067. [PMID: 33273143 DOI: 10.1107/s2053229620014461] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/24/2020] [Accepted: 10/30/2020] [Indexed: 11/10/2022]
Abstract
A novel polyoxomolybdate with a diprotonated porphyrin as counter-cation, namely, 5,10,15,20-tetrakis(4-carboxyphenyl)-21H,22H,23H,24H-porphine(2+) hexamolybdate(VI) pentahydrate, (C48H32N4O8)[Mo6O19]·5H2O or (H2TCPP)[Mo6O19]·5H2O, I, was prepared via the hydrothermal reaction of MoCl5, 5,10,15,20-tetrakis(4-carboxyphenyl)-21H,23H-porphine (TCPP) and distilled water. The crystal structure of hydrated polyoxometalate (POM) salt I was characterized by single-crystal X-ray diffraction. The compound is characterized by an isolated (zero-dimensional, 0D) structure, because it cannot extend via covalent bonds. The structure contains one [Mo6O19]2- anion, one (H2TCPP)2+ cation and five lattice water molecules. Each of the Mo6+ ions is six-coordinated and displays a distorted octahedral motif. The (H2TCPP)2+ cation displays a distorted saddle motif. A three-dimensional (3D) supramolecular framework is formed via hydrogen-bonding interactions. The compound shows a red photoluminescence emission.
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Affiliation(s)
- Wen Tong Chen
- Institute of Applied Chemistry, School of Chemistry and Chemical Engineering, Jian Key Laboratory of Photoelectric Crystal Materials and Device, Jiangxi Province Key Laboratory of Coordination Chemistry, Humic Acid Utilization Engineering Research Center of Jiangxi Province, Jinggangshan University, Jian, Jiangxi 343009, Peoples Republic of China, State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, Peoples Republic of China, and Department of Ecological and Resources Engineering, Fujian Key Laboratory of Eco-industrial Green Technology, Wuyi University, Wuyishan, Fujian 354300, Peoples Republic of China
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21
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Panteleieva OS, Ponomarova VV, Shtemenko AV, Domasevitch KV. Supramolecular networks supported by the anion...π linkage of Keggin-type heteropolyoxotungstates. Acta Crystallogr C 2020; 76:753-762. [PMID: 32756038 DOI: 10.1107/s205322962000950x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2020] [Accepted: 07/13/2020] [Indexed: 11/10/2022] Open
Abstract
Anion...π interactions are newly recognized weak supramolecular forces which are relevant to many types of electron-deficient aromatic substrates. Being less competitive with respect to conventional hydrogen bonding, anion...π interactions are only rarely considered as a crystal-structure-defining factor. Their significance dramatically increases for polyoxometalate (POM) species, which offer extended oxide surfaces for maintaining dense aromatic/inorganic stacks. The structures of tetrakis(caffeinium) μ12-silicato-tetracosa-μ2-oxido-dodecaoxidododecatungsten trihydrate, (C8H11N4O2)4[SiW12O40]·3H2O, (1), and tris(theobrominium) μ12-phosphato-tetracosa-μ2-oxido-dodecaoxidododecatungsten ethanol sesquisolvate, (C7H9N4O2)3[PW12O40]·1.5C2H5OH, (2), support the utility of anion...π interactions as a special kind of supramolecular synthon controlling the structures of ionic lattices. Both caffeinium [(HCaf)+ in (1)] and theobrominium cations [(HTbr)+ in (2)] reveal double stacking patterns at both axial sides of the aromatic frameworks, leading to the generation of anion...π...anion bridges. The latter provide the rare face-to-face linkage of the anions. In (1), every square face of the metal-oxide cuboctahedra accepts the interaction and the above bridges yield flat square nets, i.e. {(HCaf+)2[SiW12O40]4-}n. Two additional cations afford single stacks only and they terminate the connectivity. Salt (2) retains a two-dimensional (2D) motif of square nets, with anion...π...anion bridges involving two of the three (HTbr)+ cations. The remaining cations complete a fivefold anion...π environment of [PW12O40]3-, acting as terminal groups. This single anion...π interaction is influenced by the specific pairing of (HTbr)+ cations by double amide-to-amide hydrogen bonding. Nevertheless, invariable 2D patterns in (1) and (2) suggest the dominant role of anion...π interactions as the structure-governing factor, which is applicable to the construction of noncovalent linkages involving Keggin-type oxometalates.
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Affiliation(s)
- Olha S Panteleieva
- Department of Inorganic Chemistry, Ukrainian State University of Chemical Technology, Gagarin Ave. 8, 49005 Dnipro, Ukraine
| | - Vira V Ponomarova
- Inorganic Chemistry Department, National Taras Shevchenko University of Kyiv, Volodymyrska Str. 64/13, 01601 Kyiv, Ukraine
| | - Alexander V Shtemenko
- Department of Inorganic Chemistry, Ukrainian State University of Chemical Technology, Gagarin Ave. 8, 49005 Dnipro, Ukraine
| | - Kostiantyn V Domasevitch
- Inorganic Chemistry Department, National Taras Shevchenko University of Kyiv, Volodymyrska Str. 64/13, 01601 Kyiv, Ukraine
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Eckert P, Knickmeyer MD, Heermann S. In Vivo Analysis of Optic Fissure Fusion in Zebrafish: Pioneer Cells, Basal Lamina, Hyaloid Vessels, and How Fissure Fusion is Affected by BMP. Int J Mol Sci 2020; 21:ijms21082760. [PMID: 32316164 PMCID: PMC7215994 DOI: 10.3390/ijms21082760] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2020] [Revised: 04/02/2020] [Accepted: 04/09/2020] [Indexed: 02/07/2023] Open
Abstract
Colobomata, persistent optic fissures, frequently cause congenital blindness. Here, we focused on optic fissure fusion using in vivo time-lapse imaging in zebrafish. We identified the fusion initiating cells, which we termed “pioneer cells.” Based on morphology, localization, and downregulation of the neuroretinal (NR) precursor marker rx2, these cells could be considered as retinal pigment epithelial (RPE) progenitors. Notably, pioneer cells regain rx2 expression and integrate into the NR after fusion, indicating that they do not belong to the pool of RPE progenitors, supported by the lack of RPE marker expression in pioneer cells. They establish the first cellular contact between the margins in the proximal fissure region and separate the hyaloid artery and vein. After initiation, the fusion site is progressing distally, increasing the distance between the hyaloid artery and vein. A timed BMP (Bone Morphogenetic Protein) induction, resulting in coloboma, did not alter the morphology of the fissure margins, but it did affect the expression of NR and RPE markers within the margins. In addition, it resulted in a persisting basal lamina and persisting remnants of periocular mesenchyme and hyaloid vasculature within the fissure, supporting the necessity of BMP antagonism within the fissure margins. The hampered fissure fusion had severe effects on the vasculature of the eye.
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Affiliation(s)
- Priska Eckert
- Department of Molecular Embryology, Institute of Anatomy and Cell Biology, Faculty of Medicine, University Freiburg, 79104 Freiburg, Germany; (P.E.); (M.D.K.)
- Faculty of Biology, University of Freiburg, Schaenzlestrasse 1, D-79104 Freiburg, Germany
| | - Max D. Knickmeyer
- Department of Molecular Embryology, Institute of Anatomy and Cell Biology, Faculty of Medicine, University Freiburg, 79104 Freiburg, Germany; (P.E.); (M.D.K.)
- Faculty of Biology, University of Freiburg, Schaenzlestrasse 1, D-79104 Freiburg, Germany
| | - Stephan Heermann
- Department of Molecular Embryology, Institute of Anatomy and Cell Biology, Faculty of Medicine, University Freiburg, 79104 Freiburg, Germany; (P.E.); (M.D.K.)
- Correspondence:
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Zeng Y, Liu Y, Wang L, Huang H, Zhang X, Liu Y, Min M, Li Y. Effect of Silver Nanoparticles on the Microstructure, Non-Isothermal Crystallization Behavior and Antibacterial Activity of Polyoxymethylene. Polymers (Basel) 2020; 12:E424. [PMID: 32059358 DOI: 10.3390/polym12020424] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2020] [Revised: 02/01/2020] [Accepted: 02/07/2020] [Indexed: 12/17/2022] Open
Abstract
Silver (Ag) nanoparticles were synthesized by a facile route in the presence of oleic acid and n-propylamine. It was shown that the average primary size of the as-synthesized Ag nanoparticles was approximately 10 nm and the surface of as-synthesized Ag nanoparticles was capped with monolayer surfactants with the content of 19.6%. Based on as-synthesized Ag nanoparticles, polyoxymethylene (POM)/Ag nanocomposites were prepared. The influence of Ag nanoparticles on non-isothermal crystallization behavior of POM was investigated by differential scanning calorimetry (DSC). The Jeziorny, Jeziorny-modified Avrami, Ozawa, Liu and Mo, Ziabicki and Kissinger models were applied to analyze the non-isothermal melt crystallization data of POM/Ag nanocomposites. Results of half time (t1/2), crystallization rate parameter (CRP), crystallization rate function (K(T)), kinetic parameter (F(T)), the kinetic crystallizability at unit cooling rate (GZ) and the crystallization activation energy (∆E) were determined. Small amounts of Ag nanoparticles dispersed into POM matrix were shown to act as heterogeneous nuclei, which could enhance the crystallization rate of POM, increase the number of POM spherulites and reduce POM spherulites size. However, the higher loading of Ag nanoparticles were easily aggregated, which restrained POM crystallization to some degree. Furthermore, the POM/Ag nanocomposites showed robust antibacterial activity against Escherichia coli and Staphylococcus aureus.
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Skorepova E, Harchani A, Ftini MM, Dušek M, Haddad A. Crystal structure of a new polyoxometalate ( POM) compound with a high level of crystallographic disorder. Acta Crystallogr C Struct Chem 2020; 76:164-169. [PMID: 32022711 DOI: 10.1107/s2053229619015596] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/25/2019] [Accepted: 11/18/2019] [Indexed: 05/30/2023]
Abstract
The crystal structure, Hirshfeld surface analysis and spectroscopic analysis of a new polyoxometalate (POM) compound, namely, nonakis(2-methoxyaniline) bis(diphosphopentamolybdate) trihydrate, (C7H9NO)9[P2Mo5O23]2·3H2O, is reported. The title compound was synthesized using the solution method and was structurally characterized by single-crystal X-ray diffraction, which revealed P-1 symmetry. A study of the intermolecular interactions using Hirshfeld surface analysis confirmed that the hydrogen-bonding interactions play the dominant role in the stability of the crystal structure. The refinement was complicated by extensive disorder affecting 11 of the 16 ions and molecules in the asymmetric unit. IR and UV-Vis spectroscopic techniques were used to identify the vibrational modes and to classify this compound as an insulator.
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Affiliation(s)
- Eliska Skorepova
- Institute of Physics ASCR, Na Slovance 2, 182 21 Praha 8, Czech Republic
| | - Ali Harchani
- Laboratoire de Matériaux, Cristallochimie et de Thermodynamique Appliquée, Université de Monastir, Faculté des Sciences Monastir, 5000 Monastir, Tunisia
| | - Mohamed Mongi Ftini
- Université de Monastir, Faculté des Sciences Monastir, 5000 Monastir, Tunisia
| | - Michal Dušek
- Institute of Physics ASCR, Na Slovance 2, 182 21 Praha 8, Czech Republic
| | - Amor Haddad
- Laboratoire de Matériaux, Cristallochimie et de Thermodynamique Appliquée, Université Tunis El Manar, Faculté des Sciences de Tunis, 2092 Tunis, Tunisia
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Polychronakis N, Lagouvardos P, Polyzois G, Sykaras N, Zoidis P. Color changes of polyetheretherketone (PEEK) and polyoxymethelene ( POM) denture resins on single and combined staining/cleansing action by CIELab and CIEDE2000 formulas. J Prosthodont Res 2019; 64:159-166. [PMID: 31852607 DOI: 10.1016/j.jpor.2019.06.005] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2019] [Revised: 05/27/2019] [Accepted: 06/17/2019] [Indexed: 10/25/2022]
Abstract
PURPOSE The purpose of study was to investigate the long-term effect of staining and/or cleansing solutions on the color stability of two non-metal removable partial denture materials. METHODS One hundred disks (25×3mm) of polyoxymethylene (POM) and polyetheretherketone (PEEK) were immersed in water, wine, coffee, cleanser and combo bath, simulating normal daily use. Color parameters in the CIELAB system was measured every 30 cycles up to 240 using a contact colorimeter and color differences estimated using ΔEab and ΔE00 formulas. Two-way repeated measures ANOVAs and regression analyses were performed at α=0.05. RESULTS Regression analysis indicated a strong R2 between color changes and number of cycles, for both materials. Tests of within-subjects effects for the ΔEab revealed significant differences among cycles and between the materials in the wine and coffee baths (p<0.001). Significant materialXcycles interactions were also recorded with all staining baths. ΔE00 values were lower than ΔEab up to 63.6%. Tests within and between-subjects effects for the ΔE00 gave similar but not the same with ΔEab results. CONCLUSIONS ΔE00 found to correlate well with ΔEab. Long term exposure of both materials showed a progressive discoloration in all except control baths. POM discolored more than PEEK in coffee, and combo baths but not in cleanser. Discoloration was smaller in combo bath (where a cleanser was also used) indicating the effectiveness of a cleanser to prevent long term discoloration of both materials.
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Affiliation(s)
- Nick Polychronakis
- Department of Prosthodontics, School of Dentistry, National and Kapodistrian University of Athens, Athens, Greece.
| | - Panagiotis Lagouvardos
- Department of Operative Dentistry, School of Dentistry, National and Kapodistrian University of Athens, Athens, Greece
| | - Gregory Polyzois
- Department of Prosthodontics, School of Dentistry, National and Kapodistrian University of Athens, Athens, Greece
| | - Nikitas Sykaras
- Department of Prosthodontics, School of Dentistry, National and Kapodistrian University of Athens, Athens, Greece
| | - Panagiotis Zoidis
- Department of Restorative Dental Sciences, Division of Prosthodontics, University of Florida College of Dentistry, Gainesville, FL, United States
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Lu YK, Li YP, Yang LY, Wang WH, Pan Y, Yan WF, Liu YQ. Modified polyoxometalate: a novel monocapped bi-supporting and reduced α-Keggin structure {PMo 12O 40[Cu(2,2'-bpy)]}[Cu(2,2'-bpy)(en)(H 2O)] 2. Acta Crystallogr C Struct Chem 2019; 75:1344-1352. [PMID: 31589150 DOI: 10.1107/s2053229619011999] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/17/2019] [Accepted: 08/29/2019] [Indexed: 11/10/2022]
Abstract
A novel modified polyoxometalate, {PMo12O40[Cu(2,2'-bpy)]}[Cu(2,2'-bpy)(en)(H2O)]2 [2,2'-bpy is 2,2'-bipyridyl (C10H8N2) and en is ethylenediamine (C2H8N2)], has been synthesized hydrothermally and structurally characterized by elemental analysis, TG, IR, XPS and single-crystal X-ray diffraction. The structural analysis reveals that the compound contains the reduced Keggin polyanion [PMo12O40]6- as the parent unit, which is monocapped by [Cu(2,2'-bpy)]2+ fragments via four bridging O atoms on an {Mo4O4} pit and bi-supported by two [Cu(2,2'-bpy)(en)(H2O)]2+ coordination cations simultaneously. There exist strong intramolecular π-π stacking between the capping and supporting units, which play a stabilizing role during the crystallization of the compound. Adjacent POM clusters are further aggregated to form a three-dimensional supramolecular network through noncovalent forces, hydrogen bonding and π-π stacking interactions. In addition, the photocatalytic properties were investigated in detail, and the results indicated that the compound can be used as a photocatalyst towards the decomposition of the organic pollutant methylene blue (MB).
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Affiliation(s)
- Yu Kun Lu
- College of Science and State Key Laboratory of Heavy Oil Processing, China University of Petroleum (East China), Qingdao 266580, People's Republic of China
| | - Ya Ping Li
- College of Science and State Key Laboratory of Heavy Oil Processing, China University of Petroleum (East China), Qingdao 266580, People's Republic of China
| | - Ling Yu Yang
- College of Science and State Key Laboratory of Heavy Oil Processing, China University of Petroleum (East China), Qingdao 266580, People's Republic of China
| | - Wen Hong Wang
- College of Science and State Key Laboratory of Heavy Oil Processing, China University of Petroleum (East China), Qingdao 266580, People's Republic of China
| | - Yuan Pan
- College of Science and State Key Laboratory of Heavy Oil Processing, China University of Petroleum (East China), Qingdao 266580, People's Republic of China
| | - Wen Fu Yan
- State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, Changchun 130012, People's Republic of China
| | - Yun Qi Liu
- College of Science and State Key Laboratory of Heavy Oil Processing, China University of Petroleum (East China), Qingdao 266580, People's Republic of China
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Abstract
During my postdoc interview in June of 1998, I asked Günter why he was moving more towards the nucleus in his latest studies. He said, "Well Joe, that's where everything starts." By the end of the interview, I accepted the postdoc. He had a way of making everything sound so cool. Günter's progression was natural, since the endoplasmic reticulum and the nucleus are the only organelles that share the same membrane. The nuclear envelope extends into a double membrane system with nuclear pore complexes embedded in the pore membrane openings. Even while writing this review, I remember Günter stressing; it is the nuclear pore complex. Just saying nuclear pore doesn't encompass the full magnitude of its significance. The nuclear pore complex is one of the largest collection of proteins that fit together for an overall function: transport. This review will cover the Blobel lab contributions in the quest for the blueprint of the nuclear pore complex from isolation of the nuclear envelope and nuclear lamin to the ring structures.
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Krivosudský L, Roller A, Rompel A. Regioselective synthesis and characterization of monovanadium-substituted β-octamolybdate [VMo 7O 26] 5. Acta Crystallogr C Struct Chem 2019; 75:872-876. [PMID: 31271374 PMCID: PMC6610555 DOI: 10.1107/s205322961900620x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/14/2019] [Accepted: 05/02/2019] [Indexed: 11/28/2022]
Abstract
The monovanadium-substituted β-octamolybdate [VMo7O26]5− was prepared by a one-pot approach using peroxido complexes of vanadium. 51V NMR spectroscopy confirmed the high selectivity of the synthesis. The monovanadium-substituted polyoxometalate anion [VMo7O26]5−, exhibiting a β-octamolybdate archetype structure, was selectively prepared as pentapotassium [hexaikosaoxido(heptamolybdenumvanadium)]ate hexahydrate, K5[VMo7O26]·6H2O (VMo7), by oxidation of a reduced vanadomolybdate solution with hydrogen peroxide in a fast one-pot approach. X-ray structure analysis revealed that the V atom occupies a single position in the cluster that differs from the other positions by the presence of one doubly-bonded O atom instead of two terminal oxide ligands in all other positions. The composition and structure of VMo7 was also confirmed by elemental analyses and IR spectroscopy. The selectivity of the synthesis was inspected by a 51V NMR investigation which showed that this species bound about 95% of VV in the crystallization solution. Upon dissolution of VMo7 in aqueous solution, the [VMo7O26]5− anion is substantially decomposed, mostly into [VMo5O19]3−, α-[VMo7O26]4− and [V2Mo4O19]4−, depending on the pH.
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Affiliation(s)
- Lukáš Krivosudský
- Universität Wien, Fakultät für Chemie, Institut für Biophysikalische Chemie, Althanstrasse 14, Wien 1090, Austria
| | - Alexander Roller
- Universität Wien, Fakultät für Chemie, Zentrum für Röntgenstrukturanalyse, Währinger Strasse 42, 1090 Wien, Austria
| | - Annette Rompel
- Universität Wien, Fakultät für Chemie, Institut für Biophysikalische Chemie, Althanstrasse 14, Wien 1090, Austria
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Derrien M, Shin KH, Hur J. Assessment on applicability of common source tracking tools for particulate organic matter in controlled end member mixing experiments. Sci Total Environ 2019; 666:187-196. [PMID: 30798229 DOI: 10.1016/j.scitotenv.2019.02.258] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/25/2019] [Revised: 02/15/2019] [Accepted: 02/16/2019] [Indexed: 06/09/2023]
Abstract
In this study, ideal mixing behaviors of the three commonly-used source tracking tools, which include fluorescence spectroscopy, stable isotope ratios, and lipid biomarkers, were evaluated in controlled particular organic matter (POM) mixtures of two contrasting end members e.g., soil and algae. In parallel, three different extraction methods based on water (WEOM) and two alkaline solutions were compared to identify the preferential pre-treatment option that leads to a good performance of the spectroscopic source tracking indices on the dissolved organic matter (DOM) extracted from the POM. Based on three evaluation criteria concerning the linearity of the relationships, the discrimination sensitivity, and the conservative mixing behavior of fourteen tested indices, the fluorescence proxies such as the relative distribution of the fluorescence components and the modified fluorescence index YFI of the WEOM were found to be reliable and robust indices for POM source tracking. The carbon stable isotope ratios of the POM samples exhibited an ideal mixing behavior even after the DOM extraction, while the biomarkers of sterols/stanols did not present a good linear and conservative behavior at similar conditions. In addition, the WEOM was identified as the preferred extraction method for the application of spectroscopic indices for POM source discrimination. This study provides a guideline to select the optimum indices for the POM source discrimination via the end member mixing analysis.
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Affiliation(s)
- Morgane Derrien
- Department of Environment and Energy, Sejong University, Seoul 143-747, South Korea
| | - Kyung-Hoon Shin
- Department of Environmental Marine Sciences, Hanyang University, Ansan, Gyeonggi do 15588, South Korea
| | - Jin Hur
- Department of Environment and Energy, Sejong University, Seoul 143-747, South Korea.
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Zheng X, Como S, Magni P, Huang L. Spatiotemporal variation in environmental features and elemental/isotopic composition of organic matter sources and primary producers in the Yundang Lagoon (Xiamen, China). Environ Sci Pollut Res Int 2019; 26:13126-13137. [PMID: 30900126 DOI: 10.1007/s11356-019-04720-2] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/07/2018] [Accepted: 02/26/2019] [Indexed: 06/09/2023]
Abstract
Aquatic eutrophication is a major problem globally, leading to significant chemical-compositional changes in the first trophic levels of a food web. These will consequently affect the whole food web dynamics in eutrophic coastal ecosystems. In this study, we analyzed the spatiotemporal variation in water chlorophyll-a, total organic carbon (TOC) and TOC/Chl-a ratio, and in the elemental/isotopic (Cat/Nat, δ13C, δ15N) composition of particulate organic matter (POM), phytoplankton, sedimentary organic matter, benthic microalgae, U. lactuca, and decaying leaves of mangrove plants in the eutrophic, urban lagoon of Yundang (Xiamen, China). Investigations were carried out in four different sectors of the lagoon in March (dominated by Ulva lactuca) and September (dominated by phytoplankton) 2009, and the feasible contribution of potential organic matter (OM) sources to POM was assessed in each period. The results showed significant spatiotemporal variation in δ13C and δ15N of POM, owing to changes in its carbon sources. The POM in the diversion canal (POMDC) of the lagoon originated mainly from terrestrial OM both in March and September, as evidenced by a Cat/Nat ratio of 12~17 and a TOC/Chl-a ratio exceeding 400, as well as depleted δ13C (- 27.3~- 23.7‰) and δ15N (- 2.8~0.1‰). The POM in the main canal (POMMC) and the inner (POMIL) and outer (POMOL) sectors of the lagoon were largely composed of lagoon-borne phytoplankton in September. This was revealed by TOC/Chl-a values below 100 and enriched δ13C values (- 22.7~- 17.9‰) which are close to the values typical for fresh phytoplankton. However, these were strongly regulated by exogenous OM in March. The combined contribution of POMMC and POMDC to POM in March reached 64-99% in the inner lagoon and 67-88% in the outer lagoon. Non-living POM, which originates from terrestrial organic detritus, was the main contributor to POM (60.7~85.7%) both in the inner and outer sections of the lagoon. Overall, the present study demonstrates that the temporal changes in the dominance of primary producers were reflected in significant variation in the environmental features and elemental/isotopic composition of OM sources and their contribution to POM in the Yundang Lagoon. To further our understanding of the effects of eutrophication due to different primary producers on the resource partitioning in the Yundang Lagoon, additional studies on the consumers and the whole food web of the lagoon are expected.
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Affiliation(s)
- Xinqing Zheng
- Third Institute of Oceanography, Ministry of Natural Resources, Xiamen, 361005, People's Republic of China
| | - Serena Como
- National Research Council of Italy, Institute for the Study of Anthropogenic Impact and Sustainability in the Marine Environment (CNR-IAS), 09170, Oristano, Italy
| | - Paolo Magni
- National Research Council of Italy, Institute for the Study of Anthropogenic Impact and Sustainability in the Marine Environment (CNR-IAS), 09170, Oristano, Italy
| | - Lingfeng Huang
- Key Laboratory of the Ministry of Education for Coastal and Wetland Ecosystems, Xiamen University, Xiamen, 361102, People's Republic of China.
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Mishriky J, Stupans I, Chan V. Pharmacists' views on the upscheduling of codeine-containing analgesics to 'prescription only' medicines in Australia. Int J Clin Pharm 2019; 41:538-45. [PMID: 30879215 DOI: 10.1007/s11096-019-00804-8] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2018] [Accepted: 02/20/2019] [Indexed: 10/27/2022]
Abstract
Background Codeine is the most commonly used opioid worldwide, and is available over-the-counter (OTC) in many countries. There is continual debate regarding the risk:benefit profile for OTC codeine. In Australia, codeine containing analgesics became 'prescription only medicine' from February 2018. However, there is currently limited knowledge on the views of community pharmacists on this upscheduling and the perceived impacts on clinical practice. Objective To investigate the views of community pharmacists on the recent codeine upscheduling in Australia. Setting Community pharmacists in Australia, predominately recruited from Victoria. Method A descriptive cross-sectional study was conducted using a pre-tested customised anonymous self-administered online questionnaire between March and May 2018. To capture a broad range of demographics, pharmacists were recruited via local industry contacts and the Pharmaceutical Society newsletter, with further recruitment through snowball sampling. Main outcome measure Pharmacists' opinions to targeted questions regarding the perceived advantages and disadvantages of the recent 2018 codeine rescheduling from both their perspectives and their perceived impact on patients. Results A total of 113 pharmacists completed the survey. Approximately 43% of pharmacists agreed/strongly agreed that they believed upscheduling will positively impact their ability to manage pain; while 30% were neutral. Approximately 54% of pharmacists agreed/strongly agreed that they believed upscheduling will positively benefit their patients; while 25% were neutral. Perceived advantages for codeine upscheduling included: increased pharmacist/patient engagement, and less codeine use leading to better overall risk:benefit outcome; while disadvantages included: fewer analgesic options, and increased burden for patients, General Practitioners, and the health system. Conclusion This study showed that the current views on the recent codeine upscheduling are quite mixed, with both advantages and disadvantages perceived. Improving education and up-skilling in this space is essential.
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Wu C, Hu J, Tian J, Chu F, Yao Z, Zheng Y, Yin D, Li C. Stacking of Tailored Chalcogenide Nanosheets around MoO 2-C Conductive Stakes Modulated by a Hybrid POM⊂MOF Precursor Template: Composite Conversion-Insertion Cathodes for Rechargeable Mg-Li Dual-Salt Batteries. ACS Appl Mater Interfaces 2019; 11:5966-5977. [PMID: 30638364 DOI: 10.1021/acsami.8b18607] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Mg anode has pronounced advantages in terms of high volumetric capacity, resource abundance, and dendrite-free electrochemical plating, which make rechargeable Mg-based batteries stand out as a representative next-generation energy storage system utilized in the field of large-scale stationary electric grid. However, sluggish Mg2+ diffusion in cathode lattices and facile passivation on the Mg anode hinder the commercialization of Mg batteries. Exploring a highly electroactive cathode prototype with hierarchical nanostructure and compatible electrolyte system with the capability of activating both an anode and a cathode is still a challenge. Here, we propose a POM⊂MOF (NENU-5) core-shell architecture as a hybrid precursor template to achieve the stacking of tailored chalcogenide nanosheets around MoO2-C conductive stakes, which can be employed as conversion-insertion cathodes (Cu1.96S-MoS2-MoO2 and Cu2Se-MoO2) for Mg-Li dual-salt batteries. Li-salt modulation further activates the capacity and rate performance at the cathode side by preferential Li-driven displacement reaction in Cu+ extrusible lattices. The heterogeneous conductive network and conformal dual-doped carbon coating enable a reversible capacity as high as 200 mAh/g with a coulombic efficiency close to 100%. The composite cathode can endure a long-term cycling up to 400 cycles and a high current density up to 2 A/g. The diversity of MOF-based materials infused by functional molecules or clusters would enrich the nanoengineering of electrodes to meet the performance demand for future multivalent batteries.
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Affiliation(s)
- Chenglong Wu
- School of Environmental and Chemical Engineering , Shanghai University , Shanghai 200444 , China
- State Key Laboratory of High Performance Ceramics and Superfine Microstructure , Shanghai Institute of Ceramics, Chinese Academy of Sciences , Shanghai 200050 , China
| | - Jiulin Hu
- State Key Laboratory of High Performance Ceramics and Superfine Microstructure , Shanghai Institute of Ceramics, Chinese Academy of Sciences , Shanghai 200050 , China
| | - Jing Tian
- State Key Laboratory of High Performance Ceramics and Superfine Microstructure , Shanghai Institute of Ceramics, Chinese Academy of Sciences , Shanghai 200050 , China
| | - Fulu Chu
- State Key Laboratory of High Performance Ceramics and Superfine Microstructure , Shanghai Institute of Ceramics, Chinese Academy of Sciences , Shanghai 200050 , China
| | - Zhenguo Yao
- State Key Laboratory of High Performance Ceramics and Superfine Microstructure , Shanghai Institute of Ceramics, Chinese Academy of Sciences , Shanghai 200050 , China
| | - Yongjian Zheng
- State Key Laboratory of High Performance Ceramics and Superfine Microstructure , Shanghai Institute of Ceramics, Chinese Academy of Sciences , Shanghai 200050 , China
| | - Dongguang Yin
- School of Environmental and Chemical Engineering , Shanghai University , Shanghai 200444 , China
| | - Chilin Li
- State Key Laboratory of High Performance Ceramics and Superfine Microstructure , Shanghai Institute of Ceramics, Chinese Academy of Sciences , Shanghai 200050 , China
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Singh JSK, Ching YC, Liu DS, Ching KY, Razali S, Gan SN. Effects of PTFE Micro-Particles on the Fiber-Matrix Interface of Polyoxymethylene/Glass Fiber/Polytetrafluoroethylene Composites. Materials (Basel) 2018; 11:E2164. [PMID: 30400137 PMCID: PMC6267008 DOI: 10.3390/ma11112164] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/11/2018] [Revised: 10/15/2018] [Accepted: 10/18/2018] [Indexed: 11/16/2022]
Abstract
Reinforcing polyoxymethylene (POM) with glass fibers (GF) enhances its mechanical properties, but at the expense of tribological performance. Formation of a transfer film to facilitate tribo-contact is compromised due to the abrasiveness of GF. As a solid lubricant, for example, polytetrafluoroethylene (PTFE) significantly improves friction and wear resistance. The effects of chemically etched PTFE micro-particles on the fiber-matrix interface of POM/GF/PTFE composites have not been systematically characterized. The aim of this study is to investigate their tribological performance as a function of micro-PTFE blended by weight percentage. Samples were prepared by different compositions of PTFE (0, 1.7, 4.0, 9.5, 15.0 and 17.3 wt.%). The surface energy of PTFE micro-particles was increased by etching for 10 min using sodium naphthalene salt in tetrahydrofuran. Tribological performance was characterized through simultaneous acquisition of the coefficient of friction and wear loss on a reciprocating test rig in accordance to Procedure A of ASTM G133-95. Friction and wear resistance improved as the micro-PTFE weight ratio was increased. Morphology analysis of worn surfaces showed transfer film formation, encapsulating the abrasive GF. Energy dispersive X-ray spectroscopy (EDS) revealed increasing PTFE concentration from the GF surface interface region (0.5, 1.0, 1.5, 2.0, 2.5 µm).
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Affiliation(s)
- Jasbir Singh Kunnan Singh
- Department of Chemical Engineering, Faculty of Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia.
- Department of Mechanical Engineering, Faculty of Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia.
| | - Yern Chee Ching
- Department of Chemical Engineering, Faculty of Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia.
| | - De Shin Liu
- Department of Mechanical Engineering, Faculty of Engineering, National Chung Cheng University, Chiayi County 62102, Taiwan.
| | - Kuan Yong Ching
- School of Foundation, University of Reading Malaysia, Persiaran Graduan, Kota Ilmu, Educity, 79200 Iskandar Puteri Johor, Malaysia.
| | - Shaifulazuar Razali
- Department of Mechanical Engineering, Faculty of Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia.
| | - Seng Neon Gan
- Department of Chemistry, Faculty of Science, University of Malaya, 50603 Kuala Lumpur, Malaysia.
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Gumerova NI, Dobrov A, Roller A, Rompel A. Iron(II) and copper(II) paratungstates B: a single-crystal X-ray diffraction study. Acta Crystallogr C Struct Chem 2018; 74:1252-1259. [PMID: 30398176 PMCID: PMC6218883 DOI: 10.1107/s2053229618010021] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2018] [Accepted: 07/11/2018] [Indexed: 11/22/2022] Open
Abstract
Paratungstate B is a common isopolytungstate (IPOT) built of the [W12O40(OH)2]10- anion and exhibits a cluster-like construction of 12 W-centred distorted octahedra. Due to a high surface charge density, the paratungstate anion acts as a multidentate ligand forming high-dimensional extended structures, which exhibit unique catalytic and magnetic properties. Two new paradodecatungstate B compounds decorated by iron(II) or copper(II), namely Na5Fe2.5[W12O40(OH)2]·36H2O (Na5Fe2.5paraB) and Na4Cu3[W12O40(OH)2]·28H2O (Na4Cu3paraB), have been synthesized by a convenient aqueous solution method, and structurally characterized by single-crystal and powder X-ray diffraction, IR spectroscopy, elemental analysis and thermogravimetric analysis. Both compounds crystallize in the triclinic P-1 space group. In both compounds, the [W12O40(OH)2]10- polyanion acts as a multidentate ligand that links transition-metal and sodium cations, forming a three-dimensional framework.
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Affiliation(s)
- Nadiia I. Gumerova
- Universität Wien, Fakultät für Chemie, Institut für Biophysikalische Chemie, Althanstrasse 14, Wien 1090, Austria
| | - Anatolie Dobrov
- Universität Wien, Fakultät für Chemie, Institut für Biophysikalische Chemie, Althanstrasse 14, Wien 1090, Austria
| | - Alexander Roller
- Universität Wien, Fakultät für Chemie, Zentrum für Röntgenstrukturanalyse, Währinger Strasse 42, Wien 1090, Austria
| | - Annette Rompel
- Universität Wien, Fakultät für Chemie, Institut für Biophysikalische Chemie, Althanstrasse 14, Wien 1090, Austria
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Chen Q, Shen C, He L. Recent advances of polyoxometalate-catalyzed selective oxidation based on structural classification. Acta Crystallogr C Struct Chem 2018; 74:1182-1201. [PMID: 30398171 DOI: 10.1107/s2053229618010902] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/13/2018] [Accepted: 07/30/2018] [Indexed: 12/31/2022]
Abstract
The structural diversity and tenability observed in POMs has encouraged extensive investigations into their catalytic activity. Based on the structural classification of POMs, this review summarizes recent advances relating to POM-catalyzed selective oxidation and places most emphasis on dynamic developments from 2015 onwards. Work which contributes to comparing the catalytic performance of POMs with delicate structural differences (e.g. the same type of POM structure with differences of the heteroatom, addenda, protonated state or counter-ion) and in elucidating the origin/distinction of catalytic activity, as well as reasonable mechanisms, are especially highlighted.
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Affiliation(s)
- Qiongyao Chen
- State Key Laboratory for Oxo Synthesis and Selective Oxidation, Suzhou Research Institute of LICP, Lanzhou Institute of Chemical Physics (LICP), Chinese Academy of Sciences, Lanzhou 730000, People's Republic of China
| | - Chaoren Shen
- State Key Laboratory for Oxo Synthesis and Selective Oxidation, Suzhou Research Institute of LICP, Lanzhou Institute of Chemical Physics (LICP), Chinese Academy of Sciences, Lanzhou 730000, People's Republic of China
| | - Lin He
- State Key Laboratory for Oxo Synthesis and Selective Oxidation, Suzhou Research Institute of LICP, Lanzhou Institute of Chemical Physics (LICP), Chinese Academy of Sciences, Lanzhou 730000, People's Republic of China
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Reinoso S, Artetxe B, Gutiérrez-Zorrilla JM. Single-crystal-to-single-crystal transformations triggered by dehydration in polyoxometalate-based compounds. Acta Crystallogr C 2018; 74:1222-1242. [PMID: 30398173 DOI: 10.1107/s2053229618011269] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2018] [Accepted: 08/07/2018] [Indexed: 01/05/2023] Open
Abstract
Single-crystal-to-single-crystal transformations are solid-state phase transitions between different crystalline states in which the crystal integrity and the long-range structural order are retained through the whole transformation process. Such a phenomenon constitutes the structural response that some compounds afford when being exposed to a given external stimulus (temperature, pressure, light, etc.) and, therefore, its study has become a relevant focus of interest within crystal engineering because it allows for monitoring how certain properties (colour, magnetism, luminescence, porosity) of the stimuli-responsive material are modified as the structure evolves into the activated form. A range of organic, inorganic and hybrid systems have been found to undergo such phase transitions, but these examples only include a small number of compounds that incorporate polyoxometalate anions, among which the removal of guest solvent molecules (dehydration) stands out as the most common external stimulus able to induce the occurrence of a single-crystal-to-single-crystal transformation. This feature article compiles the examples of dehydration-triggered single-crystal-to-single-crystal transformation studies that have been reported to date for polyoxometalate-based compounds and reviews some of their most relevant structural aspects.
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Affiliation(s)
- Santiago Reinoso
- Institute for Advanced Materials (InaMat), Universidad Pública de Navarra (UPNA), Edificio Jerónimo de Ayanz, Campus de Arrosadia, Pamplona 31006, Spain
| | - Beñat Artetxe
- Departamento de Química Inorgánica, Facultad de Ciencia y Tecnología, Universidad del País Vasco UPV/EHU, PO Box 644, Bilbao 48080, Spain
| | - Juan M Gutiérrez-Zorrilla
- Departamento de Química Inorgánica, Facultad de Ciencia y Tecnología, Universidad del País Vasco UPV/EHU, PO Box 644, Bilbao 48080, Spain
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Duan F, Liu X, Xu W, Tao Y, Li B, Wu L. Supramolecular interaction-induced assemblies of polyanions and 2-aminopyridinium in two polyoxometalate-based hybrids. Acta Crystallogr C Struct Chem 2018; 74:1325-1333. [PMID: 30398185 DOI: 10.1107/s2053229618012548] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/13/2018] [Accepted: 09/05/2018] [Indexed: 11/10/2022]
Abstract
Organic-inorganic hybrids consisting of organic cations and polyanions are promising functional materials due to their various compositions and structures. An important aspect of these materials is the interactions between the organic and inorganic components, which not only produce the final structures, but also influence the properties. Here, we investigated the interactions between organic cations and polyanions using protonated 2-aminopyridinium (Hap) as the cation, and successfully obtained two polyoxometalate-based hybrids, namely (C5H7N2)4[Mo8O26], (I), and (C5H7N2)2[NiMo6O16(OH)2{CH3C(CH2O)3}2]·4H2O, (II). In the crystal structure of (I), every Hap cation links with two polyanions by donating one or two N-H...O hydrogen bonds, and every polyanion is surrounded by eight Hap cations via terminal or bridging O atoms. Conversely, in compound (II), every Hap cation only links with one polyanion decorated by a triol ligand; this organic-inorganic component further assembles via uncoordinated water molecules. In the extended structures, Hap plays a key role, not only providing a counter charge, but also acting as `glue' linking polyanions in the role of hydrogen-bond donors. In both compounds, as the nodes of the supramolecular network, the polyanions exhibit an ordered two-dimensional arrangement due to strong hydrogen bonds and electrostatic interactions between the organic and inorganic parts. The electrochemistry of compound (I) shows that redox sourcing from polyanions is a surface-controlled process. Conversely, the magnetic behaviour of compound (II) indicates dominant antiferromagnetic properties.
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Affiliation(s)
- Fengxue Duan
- State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry and Institute of Theoretical Chemistry, Jilin University, Changchun 130012, People's Republic of China
| | - Xiaoting Liu
- State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry and Institute of Theoretical Chemistry, Jilin University, Changchun 130012, People's Republic of China
| | - Wei Xu
- State Key Laboratory of Inorganic Synthesis & Preparative Chemistry, Jilin University, Changchun 130012, People's Republic of China
| | - Yanchun Tao
- State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry and Institute of Theoretical Chemistry, Jilin University, Changchun 130012, People's Republic of China
| | - Bao Li
- State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry and Institute of Theoretical Chemistry, Jilin University, Changchun 130012, People's Republic of China
| | - Lixin Wu
- State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry and Institute of Theoretical Chemistry, Jilin University, Changchun 130012, People's Republic of China
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Sang XJ, Feng SL, Lu Y, Zhang YX, Su F, Zhang LC, Zhu ZM. A new hexamolybdate-based copper-2,2'-biimidazole coordination polymer serving as an acid catalyst and support for enzyme immobilization. Acta Crystallogr C Struct Chem 2018; 74:1362-1369. [PMID: 30398189 DOI: 10.1107/s2053229618013037] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/01/2018] [Accepted: 09/14/2018] [Indexed: 11/10/2022]
Abstract
The hydrothermal reaction of (NH4)3[CoMo6O24H6]·7H2O (CoMo6), CuCl2·2H2O and 2,2'-biimidazole (H2biim) led to the formation of a new coordination polymer, namely poly[diaquabis(2,2'-biimidazole)hexa-μ3-oxo-octa-μ2-oxo-hexaoxodicopper(II)hexamolybdate(VI)], [Cu2Mo6O20(C6H6N4)2(H2O)2]n (Cu-Mo6O20), at pH 2-3. It is obvious that in the formation of crystalline Cu-Mo6O20, the original Anderson-type skeleton of heteropolymolybdate CoMo6 was broken and the new isopolyhexamolybdate Mo6O20 unit was assembled. In Cu-Mo6O20, one Mo6O20 unit connects four [Cu(H2biim)(H2O)]2+ ions in a pentacoordinate mode via four terminal O atoms, resulting in a tetra-supported structure, and each CuII ion is shared by two adjacent Mo6O20 units. Infinite one-dimensional chains are established by linkage between two adjacent Mo6O20 units and two CuII ions, and these chains are further packed into a three-dimensional framework by hydrogen bonds, π-π interactions and electrostatic attractions. The catalytic performance of this crystalline material used as an efficient and reusable heterogeneous acid catalyst for carbonyl-group protection is discussed. In addition, Cu-Mo6O20 was applied as a new support for enzyme (horseradish peroxidase, HRP) immobilization, forming immobilized enzyme HRP/Cu-Mo6O20. HRP/Cu-Mo6O20 showed good catalytic activity and could be reused.
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Affiliation(s)
- Xiao Jing Sang
- School of Chemistry and Chemical Engineering, Liaoning Normal University, Huanghe Road 850, Dalian, Liaoning 116029, People's Republic of China
| | - Shu Li Feng
- School of Chemistry and Chemical Engineering, Liaoning Normal University, Huanghe Road 850, Dalian, Liaoning 116029, People's Republic of China
| | - Ying Lu
- School of Chemistry and Chemical Engineering, Liaoning Normal University, Huanghe Road 850, Dalian, Liaoning 116029, People's Republic of China
| | - Yue Xian Zhang
- School of Chemistry and Chemical Engineering, Liaoning Normal University, Huanghe Road 850, Dalian, Liaoning 116029, People's Republic of China
| | - Fang Su
- School of Chemistry and Chemical Engineering, Liaoning Normal University, Huanghe Road 850, Dalian, Liaoning 116029, People's Republic of China
| | - Lan Cui Zhang
- School of Chemistry and Chemical Engineering, Liaoning Normal University, Huanghe Road 850, Dalian, Liaoning 116029, People's Republic of China
| | - Zai Ming Zhu
- School of Chemistry and Chemical Engineering, Liaoning Normal University, Huanghe Road 850, Dalian, Liaoning 116029, People's Republic of China
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Xu J, Gable RW, Ritchie C. Targeted synthesis of a polypyridyl polyoxometalate coordination complex using microwave-assisted reaction conditions. Acta Crystallogr C Struct Chem 2018; 74:1384-1389. [PMID: 30398192 DOI: 10.1107/s205322961801183x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/04/2018] [Accepted: 08/21/2018] [Indexed: 11/10/2022]
Abstract
In this article, we build upon our recent efforts that have focused on demonstrating the value of microwave-assisted synthesis in polyoxometalate (POM) chemistry. Herein, we report for the first time a microwave-assisted approach that enabled the facile preparation and crystallization of a large POM-containing coordination complex. The judicious selection and reaction of a sparingly water-soluble transition-metal-substituted polyanion (TMSP) salt with the tritopic ligand 2,4,6-tris(4-pyridyl)-1,3,5-triazine (TPT) in a mixed solvent system under moderately forcing conditions yields Ba9[(BIIIWVI11O39CoIII)3(C18H12N6)]·38H2O in moderate yield. Crystallographic analysis reveals significant intermolecular interactions between the organic ligand and neighbouring polyanions, predominantly C-H...O(water) in nature; meanwhile, the solvated regions of the crystal show significant disorder. To supplement the crystallographic study, combustion analysis, and IR and 1H NMR spectroscopic analyses were conducted, revealing good bulk purity and the stability of the complex in aqueous media.
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Affiliation(s)
- Jingjing Xu
- The School of Chemistry, The University of Melbourne, Victoria 3010, Australia
| | - Robert W Gable
- The School of Chemistry, The University of Melbourne, Victoria 3010, Australia
| | - Chris Ritchie
- The School of Chemistry, The University of Melbourne, Victoria 3010, Australia
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Fura GD, Long Y, Yan J, Chen W, Lin CG, Song YF. Synthesis, structural characterization and fluorescence enhancement of chromophore-modified polyoxometalates. Acta Crystallogr C Struct Chem 2018; 74:1260-1266. [PMID: 30398177 DOI: 10.1107/s2053229618009361] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/23/2018] [Accepted: 06/28/2018] [Indexed: 11/11/2022]
Abstract
Intramolecular charge transfers between π-conjugated molecules and polyoxometalate (POM) clusters have been observed in donor-acceptor systems based on organic donors and inorganic POM acceptors, which unfortunately results in a general quenching of the chromophore luminescence. The development of POM-chromophore dyads that are capable of tackling the quenching process and enhancing the fluorescence intensity of such systems remains a highly challenging area of study. A family of organic-inorganic polyoxometalate <!?tlsb=-0.2pt>hybrids, {[(n-C4H9)4N]3[(MnMo6O24){(CH2)3CR}2]} [1, R = -NHCH2C14H9, namely (anthracen-9-ylmethyl)amino; 2, R = -NHCH2C13H9, (9H-fluoren-2-ylmethyl)amino; 3, R = -NHCH2C10H7, (naphthalen-2-ylmethyl)amino; 4, R = -NHCH2C16H9, (pyren-2-ylmethyl)amino], were synthesized by covalently tethering π-conjugated molecules onto an Anderson cluster. The resulting POM-chromophore dyads were fully characterized by various spectroscopic techniques, single-crystal X-ray diffraction analysis and ESI-MS. The fluorescence features of these dyads were studied in detail to verify a dramatic emission enhancement that can be achieved by fine-tuning the microenvironment in solution and suppressing the intrinsic photo-induced electron-transfer process.
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Affiliation(s)
- Gizaw D Fura
- Beijing Advanced Innovation Center for Soft Matter Science and Engineering, State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, People's Republic of China
| | - Yong Long
- Beijing Advanced Innovation Center for Soft Matter Science and Engineering, State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, People's Republic of China
| | - Jun Yan
- College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, People's Republic of China
| | - Wei Chen
- Beijing Advanced Innovation Center for Soft Matter Science and Engineering, State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, People's Republic of China
| | - Chang Gen Lin
- Beijing Advanced Innovation Center for Soft Matter Science and Engineering, State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, People's Republic of China
| | - Yu Fei Song
- Beijing Advanced Innovation Center for Soft Matter Science and Engineering, State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, People's Republic of China
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Galán-Mascarós JR, Kortz U. Special issue on Polyoxometalates. Acta Crystallogr C Struct Chem 2018; 74:1180-1181. [PMID: 30398170 DOI: 10.1107/s2053229618015188] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/29/2018] [Accepted: 10/29/2018] [Indexed: 11/10/2022]
Affiliation(s)
| | - Ulrich Kortz
- Department of Life Sciences and Chemistry, Jacobs University, Campus Ring 1, 28759 Bremen, Germany
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Kaushik R, Khan I, Saini MK, Hussain F, Sadakane M. Synthesis and characterization of carbonate-encapsulated ytterbium- and yttrium-containing polyoxotungstates. Acta Crystallogr C Struct Chem 2018; 74:1355-1361. [PMID: 30398188 DOI: 10.1107/s2053229618011841] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/18/2018] [Accepted: 08/21/2018] [Indexed: 11/10/2022]
Abstract
A sandwiched-type carbonate-encapsulated yttrium-containing arsenotungstate(III) has been synthesized under mild reaction conditions. The polyanion [NaCH3COO{Y2(H2O)3(B-α-AsW9O33)2(W2O5)(CO3)}]12- (1) was isolated as a solid crystalline material by the reaction of a YIII salt with the sodium salt of trilacunary [AsW9O33]9- in sodium acetate solution. The sodium salt of the polyanion, i.e. Na12[Na(CH3COO){Y2(AsW9O33)2(W2O5)(CO3)(H3O)3}]·22H2O (1a), was characterized by various analytical techniques, such as FT-IR, single-crystal X-ray diffraction (SC-XRD), TGA (thermogravimetric analysis), 13C NMR and ESI-MS (electrospray ionization mass spectrometry). SC-XRD studies revealed that the polyanion crystallizes in the triclinic space group P-1. The structure showed that the polyanion is a carbonate-encapsulated sandwich-type species, consisting of two trilacunary B-α-[AsW9O33]9-, with a lone-pair-containing AsIII heteroatom, together with two extra tungsten centres and two yttrium cations at the sandwich position, where CH3COO- and Na+ ions act as linkers between the two polyanion units. In addition, we have also synthesized two carbonate-encapsulated germanotungstates(IV), without lone-pair-containing heteroatoms, with the formula [Ln3(A-β-GeW9O34)2(CO3)(H2O)3]13- [Ln = YIII (2) and YbIII (3)], i.e. Y2K3Na4[Y3(A-β-GeW9O34)2(CO3)(H2O)3]·19H2O (2a) and YbK8Na2[Yb(A-β-GeW9O34)2(CO3)(H2O)3]·16H2O (3a), and characterized them by FT-IR, SC-XRD, TGA and ESI-MS. Here, the lanthanide ions act as linkers, extending the structures into higher dimensions. Sodium and potassium ions also play a key role as linkers, further extending the structure. The packing shows the presence of certain hydrophilic pores within the structure.
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Affiliation(s)
- Reetam Kaushik
- Department of Chemistry, University of Delhi, North Campus, Delhi 110 007, India
| | - Imran Khan
- Department of Chemistry, University of Delhi, North Campus, Delhi 110 007, India
| | - Mukesh Kumar Saini
- Department of Chemistry, University of Delhi, North Campus, Delhi 110 007, India
| | - Firasat Hussain
- Department of Chemistry, University of Delhi, North Campus, Delhi 110 007, India
| | - Masahiro Sadakane
- Department of Applied Chemistry, Graduate School of Engineering, Hiroshima University, 1-4-1, Kagamiyama, Higashi-Hiroshima 739-8527, Japan
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Harchani A, Trzybiński D, Pawlędzio S, Woźniak K, Haddad A. The new heteropolyoxometalate compound (C 6H 8N) 5[HAs 2Mo 6O 26(H 2O)]·3H 2O: crystal structure and Hirshfeld surface analysis. Acta Crystallogr C Struct Chem 2018; 74:1088-1093. [PMID: 30284973 DOI: 10.1107/s2053229618012317] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/18/2018] [Accepted: 08/30/2018] [Indexed: 11/10/2022]
Abstract
A detailed description of the crystal structure and a Hirshfeld surface analysis of the new heteropolyoxometalate compound (C6H8N)5[HAs2Mo6O26(H2O)]·3H2O are reported. The title compound was synthesized using solution methods and its structure was characterized by single-crystal X-ray diffraction. The investigated compound contains a new [HAs2Mo6O26(H2O)]5- polyanion and crystallizes in the monoclinic space group P21/c. The crystallographic analysis provided an understanding of the architecture and structural features of the complex crystal lattice and the Hirshfeld surface analysis shed more light on the intermolecular interactions occurring in the crystal.
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Affiliation(s)
- Ali Harchani
- Laboratoire de Matériaux, Cristallochimie et de Thermodynamique Appliquée, Université de Monastir, Faculté des Sciences Monastir, 5000 Monastir, Tunisia
| | - Damian Trzybiński
- Biological and Chemical Research Centre, Chemistry Department, University of Warsaw, Żwirki i Wigury 101, 02-089 Warszawa, Poland
| | - Sylwia Pawlędzio
- Biological and Chemical Research Centre, Chemistry Department, University of Warsaw, Żwirki i Wigury 101, 02-089 Warszawa, Poland
| | - Krzysztof Woźniak
- Biological and Chemical Research Centre, Chemistry Department, University of Warsaw, Żwirki i Wigury 101, 02-089 Warszawa, Poland
| | - Amor Haddad
- Laboratoire de Matériaux, Cristallochimie et de Thermodynamique Appliquée, Université de Monastir, Faculté des Sciences Monastir, 5000 Monastir, Tunisia
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Haouas M, Trébosc J, Roch-Marchal C, Cadot E, Taulelle F, Martineau-Corcos C. High-field 95 Mo and 183 W static and MAS NMR study of polyoxometalates. Magn Reson Chem 2017; 55:902-908. [PMID: 28437584 DOI: 10.1002/mrc.4601] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/01/2017] [Revised: 04/18/2017] [Accepted: 04/19/2017] [Indexed: 06/07/2023]
Abstract
The potential of high-field NMR to measure solid-state 95 Mo and 183 W NMR in polyoxometalates (POMs) is explored using some archetypical structures like Lindqvist, Keggin and Dawson as model compounds that are well characterized in solution. NMR spectra in static and under magic angle spinning (MAS) were obtained, and their analysis allowed extraction of the NMR parameters, including chemical shift anisotropy and quadrupolar coupling parameters. Despite the inherent difficulties of measurement in solid state of these low-gamma NMR nuclei, due mainly to the low spectral resolution and poor signal-to-noise ratio, the observed global trends compare well with the solution-state NMR data. This would open an avenue for application of solid-state NMR to POMs, especially when liquid-state NMR is not possible, e.g., for poorly soluble or unstable compounds in solution, and for giant molecules with slow tumbling motion. This is the case of Keplerate where we provide here the first NMR characterization of this class of POMs in the solid state. Copyright © 2017 John Wiley & Sons, Ltd.
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Affiliation(s)
- Mohamed Haouas
- ILV, UMR CNRS 8180, UVSQ, Versailles, 78035, Cedex, France
| | - Julien Trébosc
- Univ. de Lille Nord de France, Lille, 59000, France
- CNRS UMR 8181, UCCS; USTL, Villeneuve d'Ascq, 59652, France
| | | | - Emmanuel Cadot
- ILV, UMR CNRS 8180, UVSQ, Versailles, 78035, Cedex, France
| | | | - Charlotte Martineau-Corcos
- ILV, UMR CNRS 8180, UVSQ, Versailles, 78035, Cedex, France
- CEMHTI, CNRS UPR 3079, Orléans Cedex 2, 45071, France
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Gupta R, Huang W, Francesconi LC, Polenova T. Effect of positional isomerism and vanadium substitution on 51V magic angle spinning NMR Spectra Of Wells-Dawson polyoxotungstates. Solid State Nucl Magn Reson 2017; 84:28-33. [PMID: 27998683 PMCID: PMC5466850 DOI: 10.1016/j.ssnmr.2016.12.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/08/2016] [Revised: 12/02/2016] [Accepted: 12/04/2016] [Indexed: 06/06/2023]
Abstract
We examined the positional isomerism and vanadium substitution on the 51V magic angle spinning NMR spectra of potassium salts of vanadium-substituted polyoxotungstates of the Wells-Dawson series. NMR parameters of this class of catalytically active polyoxotungstates effect of are reported. Multiple species, indicative of differences in the local environment at the substitution sites, are observed in solid-state NMR spectra of the di- and tri- substituted complexes in contrast to solution NMR spectra, where single average chemical shift was observed. The quadrupolar and chemical shift anisotropy parameters depend strongly on the position and the degree of the vanadium substitution into the oxoanion core establishing 51V SATRAS NMR spectroscopy as a sensitive probe of the local electronic environment in these catalytically active solids.
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Affiliation(s)
- Rupal Gupta
- Department of Chemistry and Biochemistry, University of Delaware, Newark, DE 19716, USA
| | - Wenlin Huang
- Department of Chemistry and Biochemistry, University of Delaware, Newark, DE 19716, USA
| | - Lynn C Francesconi
- Department of Chemistry, City University of New York, Hunter College, 695 Park Avenue, New York 10021, USA; Ph.D. Program in Chemistry, The Graduate Center of the City University of New York, New York 10016, USA.
| | - Tatyana Polenova
- Department of Chemistry and Biochemistry, University of Delaware, Newark, DE 19716, USA.
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Singh S, Singh H, Tandon P, Chakraborty N, Rao NVS, Ayala AP. Study of Cr→SmA phase transition and hydrogen bonding in four-ring bent-core liquid crystal. Spectrochim Acta A Mol Biomol Spectrosc 2017; 178:142-150. [PMID: 28182984 DOI: 10.1016/j.saa.2017.01.067] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/12/2016] [Revised: 01/21/2017] [Accepted: 01/27/2017] [Indexed: 06/06/2023]
Abstract
A newly designed asymmetrical four-ring bent-core compound (4'-n-decyloxyphenylazo)-phenyl-4-yl-3-[N-(4'-n-octadecyloxy-2-hydroxybenzylidene) amino]-2-methyl benzoate exhibiting liquid crystalline behavior was synthesized and characterized. The thermal and textural morphology were studied using differential scanning calorimetry and polarizing optical microscopy, respectively. The study of hydrogen bonding and dynamics of the phase transition has been performed at the molecular level using temperature dependent Fourier transform infrared (FTIR) spectroscopy. The spectral analysis of OH, CH2/CH3, CO, and CN stretching vibrational bands revealed clear signatures of Cr→SmA phase transition at 125°C. Density functional theory has been adopted for the geometry optimization and conformational study of the monomer using the B3LYP/6-31G(d) method. The conformational analysis has been performed to predict the most stable conformer along with the possible conformers using one-dimensional potential energy scan employing the same level of theory. The combination of experimental findings and theoretical analysis helped to understand the mechanism of phase transitions at the molecular level.
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Affiliation(s)
- Swapnil Singh
- Department of Physics, University of Lucknow, Lucknow 226007, India
| | - Harshita Singh
- Department of Physics, University of Lucknow, Lucknow 226007, India
| | - Poonam Tandon
- Department of Physics, University of Lucknow, Lucknow 226007, India.
| | | | - N V S Rao
- Chemistry Department, Assam University, Silchar 788011, Assam, India
| | - A P Ayala
- Departamento de Física, Universidade Federal do Ceará, C.P. 6030, 60.455-900 Fortaleza, CE, Brazil
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Wang M, Zhang C, Wang X. The Wear Behavior of Textured Steel Sliding against Polymers. Materials (Basel) 2017; 10:ma10040330. [PMID: 28772688 PMCID: PMC5506931 DOI: 10.3390/ma10040330] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/11/2017] [Revised: 03/17/2017] [Accepted: 03/20/2017] [Indexed: 11/16/2022]
Abstract
Artificially fabricated surface textures can significantly improve the friction and wear resistance of a tribological contact. Recently, this surface texturing technique has been applied to polymer materials to improve their tribological performance. However, the wear behavior of textured tribo-pairs made of steel and polymer materials has been less thoroughly investigated and is not well understood; thus, it needs further research. The aim of this study is to investigate the wear properties of tribological contacts made of textured stainless steel against polymer surfaces. Three polymer materials were selected in this study, namely, ultrahigh molecular weight polyethylene (UHMWPE), polyoxymethylene (POM) and (polyetheretherketone) PEEK. Wear tests were operated through a ring-on-plane mode. The results revealed that the texture features and material properties affected the wear rates and friction coefficients of the textured tribo-pairs. In general, PEEK/textured steel achieved the lowest wear rate among the three types of tribo-pairs investigated. Energy dispersive x-ray spectroscopy (EDX) analysis revealed that the elements of C and O on the contacting counterfaces varied with texture features and indicated different wear behavior. Experimental and simulated results showed differences in the stress distribution around the dimple edge, which may influence wear performance. Wear debris with different surface morphologies were found for tribo-pairs with varying texture features. This study has increased the understanding of the wear behavior of tribo-pairs between textured stainless steel and polymer materials.
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Affiliation(s)
- Meiling Wang
- College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China.
| | - Changtao Zhang
- College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China.
| | - Xiaolei Wang
- College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China.
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Romshoo SA, Dar RA, Murtaza KO, Rashid I, Dar FA. Hydrochemical characterization and pollution assessment of groundwater in Jammu Siwaliks, India. Environ Monit Assess 2017; 189:122. [PMID: 28236149 DOI: 10.1007/s10661-017-5860-3] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/12/2016] [Accepted: 02/15/2017] [Indexed: 05/26/2023]
Abstract
Physico-chemical groundwater (GW) parameters were evaluated to understand the hydrogeochemical processes in the Siwalik plains of Jammu and Kashmir, India. During the 2012-2013 post-monsoon (POM) and pre-monsoon (PRM) seasons, GW samples (n = 207) from deep bore wells and shallow open wells were chemically analysed. Cations (Ca2+, Mg2+, Na+, K+ and Fe2+) and anions (HCO3-, Cl-, SO42- and F-) showed a wide spatio-temporal variation. Results suggest that weathering and dissolution of carbonates and silicate rocks is the main source of water mineralization. The major hydrochemical facies is characterized by Ca-Mg-HCO3 and Ca-HCO3 during the PRM and POM seasons respectively. The presence of sulphate-bearing water in a large number of the samples indicates a significant role of gypsum dissolution and anthropogenic contamination of the GW. Factor analysis (FA) and hierarchical cluster analysis (HCA) revealed that the variability of hydrochemistry is mainly related to rock-water interaction, dissolution of carbonates and other lithological units as well as the influence of anthropogenic activities in the area. Overall, it was found that the GW quality is within the limits of human consumption. The higher concentration of a few chemicals indicates an increasing trend of industrial contamination of the GW. For sustainable development of the portable GW in Siwaliks, it is necessary to minimize the adverse impacts of the anthropogenic and industrial contamination on the GW resources through best management practices and prevent its further contamination to a level that could make GW unsuitable for human uses.
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Affiliation(s)
- Shakil A Romshoo
- Department of Earth Sciences, University of Kashmir, Hazratbal, Srinagar, 190 006, India
| | - Reyaz Ahmad Dar
- Department of Earth Sciences, University of Kashmir, Hazratbal, Srinagar, 190 006, India.
| | - Khalid Omar Murtaza
- Department of Earth Sciences, University of Kashmir, Hazratbal, Srinagar, 190 006, India
| | - Irfan Rashid
- Department of Earth Sciences, University of Kashmir, Hazratbal, Srinagar, 190 006, India
| | - Farooq A Dar
- Department of Earth Sciences, University of Kashmir, Hazratbal, Srinagar, 190 006, India
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Symanski E, Tee Lewis PG, Chen TY, Chan W, Lai D, Ma X. Air toxics and early childhood acute lymphocytic leukemia in Texas, a population based case control study. Environ Health 2016; 15:70. [PMID: 27301866 PMCID: PMC4908700 DOI: 10.1186/s12940-016-0154-8] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2015] [Accepted: 06/06/2016] [Indexed: 05/22/2023]
Abstract
BACKGROUND Traffic exhaust, refineries and industrial facilities are major sources of air toxics identified by the U.S. Environmental Protection Agency (U.S. EPA) for their potential risk to human health. In utero and early life exposures to air toxics such as benzene and 1,3-butadiene, which are known leukemogens in adults, may play an etiologic role in childhood leukemia that comprises the majority of pediatric cancers. We conducted a population based case-control study to examine individual effects of benzene, 1,3-butadiene and polycyclic organic matter (POM) in ambient residential air on acute lymphocytic leukemia (ALL) diagnosed in children under age 5 years in Texas from 1995-2011. METHODS Texas Cancer Registry cases were linked to birth records and then were frequency matched by birth month and year to 10 population-based controls. Maternal and infant characteristics from birth certificates were abstracted to obtain information about potential confounders. Modelled estimates of benzene, 1,3-butadiene and POM exposures at the census tract level were assigned by linking geocoded maternal addresses from birth certificates to U.S. EPA National-Scale Air Toxics Assessment data for single and co-pollutant statistical analyses. Mixed-effects logistic regression models were applied to evaluate associations between air toxics and childhood leukemia. RESULTS In adjusted single pollutant models, odds of childhood leukemia among mothers with the highest ambient air exposures compared to those in the lowest quartile were 1.11 (95 % CI: 0.94-1.32) for POM, 1.17 (95 % CI: 0.98-1.39) for benzene and 1.29 (95 % CI: 1.08-1.52) for 1,3-butadiene. In co-pollutant models, odds ratios for childhood leukemia remained elevated for 1,3-butadiene but were close to the null value for benzene and POM. CONCLUSIONS We observed positive associations between 1,3-butadiene and childhood leukemia in single and co-pollutant models whereas effect estimates from single pollutant models were diminished for benzene and POM in co-pollutant models. Early life exposure to 1,3-butadiene rather than benzene or POM appears to increase early childhood risk of acute lymphocytic leukemia.
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Affiliation(s)
- Elaine Symanski
- Department of Epidemiology, Human Genetics and Environmental Sciences, University of Texas Health Science Center at Houston School of Public Health, Houston, Texas, USA.
| | - P Grace Tee Lewis
- Department of Epidemiology, Human Genetics and Environmental Sciences, University of Texas Health Science Center at Houston School of Public Health, Houston, Texas, USA
| | - Ting-Yu Chen
- Department of Biostatistics, University of Texas Health Science Center at Houston School of Public Health, Houston, Texas, USA
| | - Wenyaw Chan
- Department of Biostatistics, University of Texas Health Science Center at Houston School of Public Health, Houston, Texas, USA
| | - Dejian Lai
- Department of Biostatistics, University of Texas Health Science Center at Houston School of Public Health, Houston, Texas, USA
| | - Xiaomei Ma
- Yale University School of Public Health, New Haven, Connecticut, USA
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Amiraux R, Jeanthon C, Vaultier F, Rontani JF. Paradoxical effects of temperature and solar irradiance on the photodegradation state of killed phytoplankton. J Phycol 2016; 52:475-485. [PMID: 26992328 DOI: 10.1111/jpy.12410] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/26/2015] [Accepted: 02/28/2016] [Indexed: 06/05/2023]
Abstract
The aim of this paper was to study the effects of temperature and irradiance on the photodegradation state of killed phytoplankton cells. For this purpose, killed cells of the diatom Chaetoceros neogracilis RCC2022 were irradiated (photosynthetically active radiation) at 36 and 446 J · s(-1) · m(-2) (for the same cumulative dose of irradiation energy) and at two temperatures (7°C and 17°C). Analyses of specific lipid tracers (fatty acids and sterols) revealed that low temperatures and irradiances increased photooxidative damages of monounsaturated lipids (i.e., palmitoleic acid, cholesterol and campesterol). The high efficiency of type II photosensitized degradation processes was attributed to: (i) the relative preservation of the sensitizer (chlorophyll) at low irradiances allowing a longer production of singlet oxygen and (ii) the slow diffusion rate of singlet oxygen through membranes at low temperatures inducing more damages. Conversely, high temperatures and irradiances induced (i) a rapid degradation of the photosensitizer and a loss of singlet oxygen by diffusion outside the membranes (limiting type II photosensitized oxidation), and (ii) intense autoxidation processes degrading unsaturated cell lipids and oxidation products used as photodegradation tracers. Our results may explain the paradoxical relationship observed in situ between latitude and photodegradation state of phytoplankton cells.
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Affiliation(s)
- Rémi Amiraux
- Aix Marseille Université, CNRS/INSU, Université de Toulon, IRD, Mediterranean Institute of Oceanography (MIO) UM 110, Marseille, 13288, France
| | - Christian Jeanthon
- CNRS, UMR 7144, Marine Phototrophic Prokaryotes Team, Station Biologique de Roscoff, Roscoff, 29680, France
- Sorbonne Universités, UPMC Univ Paris 06, UMR 7144, Oceanic Plankton Group, Station Biologique de Roscoff, Roscoff, 29680, France
| | - Frédéric Vaultier
- Aix-Marseille University, Mediterranean Institute of Oceanography (MIO), Marseille Cedex 9, 13288, France
- CNRS-INSU/IRD UM 110, Université du Sud Toulon-Var, La Garde, 83957, France
| | - Jean-François Rontani
- Aix-Marseille University, Mediterranean Institute of Oceanography (MIO), Marseille Cedex 9, 13288, France
- CNRS-INSU/IRD UM 110, Université du Sud Toulon-Var, La Garde, 83957, France
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