1
|
Plater MJ, Harrison WTA. Chiral Thianthrenes. Int J Mol Sci 2024; 25:4311. [PMID: 38673898 PMCID: PMC11050469 DOI: 10.3390/ijms25084311] [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: 03/13/2024] [Revised: 04/08/2024] [Accepted: 04/09/2024] [Indexed: 04/28/2024] Open
Abstract
The absolute configuration and stability of two thianthrene chiral sulfoxides has been determined by means of X-ray single-crystal structure determinations. The analyses and configurations allow verification that the diastereomeric sulfoxides are stable in solution and are not interconverting, which has been suggested in some studies of sulfoxides. The two thianthrene sulfoxides have slightly different Rf values, which allowed their separation using flash chromatography on silica. The spots run back-to-back, which posed a challenge for their separation. The pure, separated compounds in solution remain as separate, single spots on a Thin Layer Chromatography (TLC) plate.
Collapse
Affiliation(s)
- M. John Plater
- Department of Chemistry, University of Aberdeen, Meston Walk, Aberdeen AB24 3UE, UK
| | | |
Collapse
|
2
|
Yang JS, Zhao YJ, Li XM, Dong XY, Si YB, Xiao LY, Hu JH, Yu Z, Zang SQ. Staggered Assembly of a Dimeric Au 13 Cluster: Impacts on Coupling of Geometric Isomerism. Angew Chem Int Ed Engl 2024; 63:e202318030. [PMID: 38308534 DOI: 10.1002/anie.202318030] [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: 11/25/2023] [Revised: 01/26/2024] [Accepted: 02/02/2024] [Indexed: 02/04/2024]
Abstract
The specific states of aggregation of metal atoms in sub-nanometer-sized gold clusters are related to the different quantum confinement volumes of electrons, leading to novel optical and electronic properties. These volumes can be tuned by changing the relative positions of the gold atoms to generate isomers. Studying the isomeric gold core and the electron coupling between the basic units is fundamentally important for nanoelectronic devices and luminescence; however, appropriate cases are lacking. In this study, the structure of the first staggered di-superatomic Au25 -S was solved using single-crystal X-ray diffraction. The optical properties of Au25 -S were studied by comparing with eclipsed Au25 -E. From Au25 -E to Au25 -S, changes in the electronic structures occurred, resulting in significantly different optical absorptions originating from the coupling between the two Au13 modules. Au25 -S shows a longer electron decay lifetime of 307.7 ps before populating the lowest triplet emissive state, compared to 1.29 ps for Au25 -E. The experimental and theoretical results show that variations in the geometric isomerism lead to distinct photophysical processes owing to isomerism-dependent electronic coupling. This study offers new insights into the connection between the geometric isomerism of nanosized building blocks and the optical properties of their assemblies, opening new possibilities for constructing function-specific nanomaterials.
Collapse
Affiliation(s)
- Jin-Sen Yang
- College of Chemistry and Chemical Engineering, Henan Polytechnic University, 454000, Jiaozuo, China
- College of Chemistry, Zhengzhou University, 450001, Zhengzhou, China
| | - Yu-Jing Zhao
- College of Chemistry, Zhengzhou University, 450001, Zhengzhou, China
| | - Xin-Mao Li
- College of Chemistry and Molecular Engineering, Peking University, 100871, Beijing, China
| | - Xi-Yan Dong
- College of Chemistry and Chemical Engineering, Henan Polytechnic University, 454000, Jiaozuo, China
- College of Chemistry, Zhengzhou University, 450001, Zhengzhou, China
| | - Yu-Bing Si
- College of Chemistry, Zhengzhou University, 450001, Zhengzhou, China
| | - Lu-Yao Xiao
- College of Chemistry, Zhengzhou University, 450001, Zhengzhou, China
| | - Jia-Hua Hu
- College of Chemistry, Zhengzhou University, 450001, Zhengzhou, China
| | - Zhihao Yu
- College of Chemistry and Molecular Engineering, Peking University, 100871, Beijing, China
| | - Shuang-Quan Zang
- College of Chemistry, Zhengzhou University, 450001, Zhengzhou, China
| |
Collapse
|
3
|
Zhong X, Nag A, Takada K, Nakajima A, Kaneko T. Incorporation of Aramids into Polybenzimidazoles to Achieve Ultra-High Thermoresistance and Toughening Effects. Molecules 2024; 29:1058. [PMID: 38474570 DOI: 10.3390/molecules29051058] [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: 01/11/2024] [Revised: 02/17/2024] [Accepted: 02/26/2024] [Indexed: 03/14/2024] Open
Abstract
Polybenzimidazoles (PBIs) are recognized for their remarkable thermal stability due to their unique molecular structure, which is characterized by aromaticity and rigidity. Despite their remarkable thermal attributes, their tensile properties limit their application. To improve the mechanical performance of PBIs, we made a vital modification to their molecular backbone to improve their structural flexibility. Non-π-conjugated components were introduced into PBIs by grafting meta-polyamide (MA) and para-polyamide (PA) onto PBI backbones to form the copolymers PBI-co-MA and PBI-co-PA. The results indicated that the cooperation between MA and PA significantly enhanced mechanical strain and overall toughness. Furthermore, the appropriate incorporation of aromatic polyamide components (20 mol% for MA and 15% for PA) improved thermal degradation temperatures by more than 30 °C. By investigating the copolymerization of PBIs with MA and PA, we unraveled the intricate relationships between composition, molecular structure, and material performance. These findings advance copolymer design strategies and deepen the understanding of polymer materials, offering tailored solutions that address thermal and mechanical demands across applications.
Collapse
Affiliation(s)
- Xianzhu Zhong
- Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, School of Chemical and Material Engineering, Jiangnan University, 1800 Lihu Avenue, Wuxi 214122, China
- Graduate School of Advanced Science and Technology, Japan Advanced Institute of Science and Technology (JAIST), 1-1 Asahidai, Nomi 923-1292, Ishikawa, Japan
| | - Aniruddha Nag
- Graduate School of Advanced Science and Technology, Japan Advanced Institute of Science and Technology (JAIST), 1-1 Asahidai, Nomi 923-1292, Ishikawa, Japan
| | - Kenji Takada
- Graduate School of Advanced Science and Technology, Japan Advanced Institute of Science and Technology (JAIST), 1-1 Asahidai, Nomi 923-1292, Ishikawa, Japan
| | - Akinori Nakajima
- Graduate School of Advanced Science and Technology, Japan Advanced Institute of Science and Technology (JAIST), 1-1 Asahidai, Nomi 923-1292, Ishikawa, Japan
| | - Tatsuo Kaneko
- Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, School of Chemical and Material Engineering, Jiangnan University, 1800 Lihu Avenue, Wuxi 214122, China
- Graduate School of Advanced Science and Technology, Japan Advanced Institute of Science and Technology (JAIST), 1-1 Asahidai, Nomi 923-1292, Ishikawa, Japan
| |
Collapse
|
4
|
Gupta T, Rani D, Nainwal LM, Badhwar R. Advancement in chiral heterocycles for the antidiabetic activity. Chirality 2024; 36:e23637. [PMID: 38384150 DOI: 10.1002/chir.23637] [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: 08/27/2023] [Revised: 11/19/2023] [Accepted: 12/11/2023] [Indexed: 02/23/2024]
Abstract
For the synthesis and development of pharmaceuticals, chirality is an important structural component. Chiral heterocyclic compounds have annoyed the interest of synthetic chemists who are working to create useful and efficient techniques for these molecules. As indicated by the expanding number of chiral drugs created in the last two decades, the link between chirality and pharmacological activity has become more important in the pharmaceutical and biopharmaceutical industries. Approximately 65% of currently used drugs are chiral, and many of them are promoted as racemates in many circumstances. There are a growing number of new chiral heterocyclic compounds with important biological properties and intriguing uses in medical chemistry and drug discovery. In this study, we review current breakthroughs in chiral heterocycles and their different physiological activities that have been published in the last year (from 2010 to early 2023). This study focuses on the current trends in the use of chiral heterocycles in drug design and the creation of several powerful and competent candidates for diabetic illnesses.
Collapse
Affiliation(s)
- Tinku Gupta
- Department of Pharmacognosy & Phytochemistry, School of Pharmaceutical Education & Research, Jamia Hamdard, New Delhi, India
| | - Dimpy Rani
- School of Medical and Allied Sciences, G.D. Goenka University, Haryana, India
| | - Lalit Mohan Nainwal
- Department of Pharmaceutical Chemistry, KIET School of Pharmacy, KIET Group of Institutions, Ghaziabad, India
| | - Reena Badhwar
- Department of Pharmacy, SGT University, Budhera, Haryana, India
| |
Collapse
|
5
|
He J, Cao L, Cui J, Fu G, Jiang R, Xu X, Guan C. Flexible Energy Storage Devices to Power the Future. Adv Mater 2024; 36:e2306090. [PMID: 37543995 DOI: 10.1002/adma.202306090] [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: 06/23/2023] [Revised: 08/03/2023] [Indexed: 08/08/2023]
Abstract
The field of flexible electronics is a crucial driver of technological advancement, with a strong connection to human life and a unique role in various areas such as wearable devices and healthcare. Consequently, there is an urgent demand for flexible energy storage devices (FESDs) to cater to the energy storage needs of various forms of flexible products. FESDs can be classified into three categories based on spatial dimension, all of which share the features of excellent electrochemical performance, reliable safety, and superb flexibility. In this review, the application scenarios of FESDs are introduced and the main representative devices applied in disparate fields are summarized first. More specifically, it focuses on three types of FESDs in matched application scenarios from both structural and material aspects. Finally, the challenges that hinder the practical application of FESDs and the views on current barriers are presented.
Collapse
Affiliation(s)
- Junyuan He
- Frontiers Science Center for Flexible Electronics, Institute of Flexible Electronics, Northwestern Polytechnical University, Xi'an, 710072, China
- Key laboratory of Flexible Electronics of Zhejiang Province, Ningbo Institute of Northwestern Polytechnical University, Ningbo, 315103, China
| | - Leiqing Cao
- Frontiers Science Center for Flexible Electronics, Institute of Flexible Electronics, Northwestern Polytechnical University, Xi'an, 710072, China
- Key laboratory of Flexible Electronics of Zhejiang Province, Ningbo Institute of Northwestern Polytechnical University, Ningbo, 315103, China
| | - Jiaojiao Cui
- Frontiers Science Center for Flexible Electronics, Institute of Flexible Electronics, Northwestern Polytechnical University, Xi'an, 710072, China
- Key laboratory of Flexible Electronics of Zhejiang Province, Ningbo Institute of Northwestern Polytechnical University, Ningbo, 315103, China
| | - Gangwen Fu
- Frontiers Science Center for Flexible Electronics, Institute of Flexible Electronics, Northwestern Polytechnical University, Xi'an, 710072, China
- Key laboratory of Flexible Electronics of Zhejiang Province, Ningbo Institute of Northwestern Polytechnical University, Ningbo, 315103, China
| | - Ruiyi Jiang
- Frontiers Science Center for Flexible Electronics, Institute of Flexible Electronics, Northwestern Polytechnical University, Xi'an, 710072, China
- Key laboratory of Flexible Electronics of Zhejiang Province, Ningbo Institute of Northwestern Polytechnical University, Ningbo, 315103, China
| | - Xi Xu
- Frontiers Science Center for Flexible Electronics, Institute of Flexible Electronics, Northwestern Polytechnical University, Xi'an, 710072, China
- Key laboratory of Flexible Electronics of Zhejiang Province, Ningbo Institute of Northwestern Polytechnical University, Ningbo, 315103, China
- Research & Development Institute of Northwestern Polytechnical University in Shenzhen, Sanhang Science &Technology Building, No. 45th, Gaoxin South 9th Road, Nanshan District, Shenzhen City, 518063, China
| | - Cao Guan
- Frontiers Science Center for Flexible Electronics, Institute of Flexible Electronics, Northwestern Polytechnical University, Xi'an, 710072, China
- Key laboratory of Flexible Electronics of Zhejiang Province, Ningbo Institute of Northwestern Polytechnical University, Ningbo, 315103, China
| |
Collapse
|
6
|
An H, Fang J, Wang M, Lin H, Sun Y, Hu B, He Z, Ge Z, Wei Y. Stereoselective study of fluoxetine and norfluoxetine across the blood-brain barrier mediated by organic cation transporter 1/3 in rats using an enantioselective UPLC-MS/MS method. Chirality 2023; 35:983-992. [PMID: 37464916 DOI: 10.1002/chir.23613] [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: 05/23/2023] [Revised: 07/04/2023] [Accepted: 07/06/2023] [Indexed: 07/20/2023]
Abstract
Fluoxetine (FLT) is a widely used antidepressant in clinical practice, which can be metabolized into active norfluoxetine (NFLT) in vivo. The stereoselectivity of FLT and NFLT enantiomers across the blood-brain barrier (BBB) is still to be clarified. In this study, accurate and reliable UPLC-MS/MS enantioselective analysis was established in rat plasma and brain. The characteristics of FLT and NFLT enantiomers across the BBB were studied by chemical knockout of rat transporters. We found that the dominant enantiomers of FLT and NFLT were S-FLT and R-NFLT, respectively, both in plasma and in brain. The FLT and NFLT enantiomers showed significant stereoselectivity across the BBB, and S-FLT and S-NFLT were the dominant configurations across the BBB. Chemical knockout of organic cation transporter 1 (OCT1) and OCT3 can affect the ratio of plasma FLT and NFLT enantiomers into the brain, suggesting that OCT1/3 is stereoselective for FLT and NFLT transport across the BBB.
Collapse
Affiliation(s)
- Hai An
- Zhejiang Key Laboratory of Neuropsychiatric Drug Research, School of Pharmacy, Hangzhou Medical College, Hangzhou, Zhejiang, China
| | - Jinjun Fang
- Zhejiang Key Laboratory of Neuropsychiatric Drug Research, School of Pharmacy, Hangzhou Medical College, Hangzhou, Zhejiang, China
| | - Min Wang
- Zhejiang Key Laboratory of Neuropsychiatric Drug Research, School of Pharmacy, Hangzhou Medical College, Hangzhou, Zhejiang, China
| | - Haiyang Lin
- Zhejiang Key Laboratory of Neuropsychiatric Drug Research, School of Pharmacy, Hangzhou Medical College, Hangzhou, Zhejiang, China
| | - Yingying Sun
- Zhejiang Key Laboratory of Neuropsychiatric Drug Research, School of Pharmacy, Hangzhou Medical College, Hangzhou, Zhejiang, China
| | - Bingying Hu
- Zhejiang Key Laboratory of Neuropsychiatric Drug Research, School of Pharmacy, Hangzhou Medical College, Hangzhou, Zhejiang, China
| | - Zhisheng He
- Zhejiang Key Laboratory of Neuropsychiatric Drug Research, School of Pharmacy, Hangzhou Medical College, Hangzhou, Zhejiang, China
| | - Zhen Ge
- Zhejiang Key Laboratory of Neuropsychiatric Drug Research, School of Pharmacy, Hangzhou Medical College, Hangzhou, Zhejiang, China
| | - Yang Wei
- Zhejiang Key Laboratory of Neuropsychiatric Drug Research, School of Pharmacy, Hangzhou Medical College, Hangzhou, Zhejiang, China
| |
Collapse
|
7
|
Yang T, Rui B, Zhang C. Assessing health human resource structure at Urumqi's center for disease control and prevention. Medicine (Baltimore) 2023; 102:e36209. [PMID: 38050251 PMCID: PMC10695540 DOI: 10.1097/md.0000000000036209] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/29/2023] [Accepted: 10/30/2023] [Indexed: 12/06/2023] Open
Abstract
By conducting an in-depth investigation and analysis of the health human resource framework within the Urumqi Center for Disease Control and Prevention (CDC), this study aims to offer valuable insights for the objective assessment and future enhancement of its talent development endeavors. A questionnaire survey was administered, followed by a descriptive analysis, involving the healthcare professionals affiliated with the Urumqi Center for CDC. The Urumqi Center for CDC exhibited a lower compilation number than its on-duty personnel count. When compared to county (district) level, the municipal level CDC displayed a higher educational attainment, a more favorable title distribution, and a younger workforce demographic. The human resource count in both Urumqi's city and county (district) level CDCs has decreased, but the relative numbers have improved, indicating enhanced quality and a younger workforce. The municipal-level CDC boasts a superior human resource structure compared to the county (district) level, with better fairness in population distribution by area than geography. Allocation equity within the central urban area is higher than in distant urban areas, highlighting regional disparities as a significant factor.
Collapse
Affiliation(s)
- Tong Yang
- Department of Public Health, Xinjiang Medical University, Urumqi, Xijiang, China
| | - Baoling Rui
- Urumqi Center for Disease Control and Prevention, Urumqi, Xijiang, China
| | - Chen Zhang
- Department of Public Health, Xinjiang Medical University, Urumqi, Xijiang, China
| |
Collapse
|
8
|
Brewer JM, Broman LM, Swol J, Lorusso R, Conrad SA, Maybauer MO. Standardized nomenclature for peripheral percutaneous cannulation of the pulmonary artery in extracorporeal membrane oxygenation: Current uptake and recommendations for improvement. Perfusion 2023:2676591231210457. [PMID: 37930875 DOI: 10.1177/02676591231210457] [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] [Indexed: 11/08/2023]
Abstract
The rising application of extracorporeal membrane oxygenation (ECMO) has emphasized the need for consistent and standardized terminology, especially concerning peripheral percutaneous cannulation of the pulmonary artery (PPC-PA). The Extracorporeal Life Support Organization (ELSO) Nomenclature Task Force produced the ELSO Maastricht Treaty for extracorporeal life support (ECLS) Nomenclature to address this challenge. However, adherence to nomenclature recommendations has been poor in publications describing PPC-PA. We aim to describe common nomenclature errors and provide a user-guide for abbreviations that can be used by authors, reviewers, and journal staff to ensure properadherence to standardized nomenclature in publications describing PPC-PA.
Collapse
Affiliation(s)
- J Michael Brewer
- Nazih Zuhdi Transplant Institute, Specialty Critical Care and Acute Circulatory Support Service, INTEGRIS Baptist Medical Center, Oklahoma City, OK, USA
| | - L Mikael Broman
- ECMO Centre Karolinska, Karolinska University Hospital, Stockholm, Sweden
- Department of Physiology and Pharmacology, Karolinska Institutet, Stockholm, Sweden
| | - Justyna Swol
- Department of Respiratory Medicine, Paracelsus Medical University, Nuremberg, Germany
| | - Roberto Lorusso
- ECLS Centrum, Cardio-Thoracic Surgery Department, and Cardiology Department, Heart & Vascular Center, Maastricht University Medical Center, Maastricht (MUMC), The Netherlands
- Cardiovascular Research Institute (CARIM), Maastricht, the Netherlands
| | - Steven A Conrad
- Department of Medicine, Louisiana State University Health Sciences Center, Shreveport, LA, USA
| | - Marc O Maybauer
- Department of Anaesthesiology and Intensive Care Medicine, Philipps University, Marburg, Germany
- Critical Care Research Group, Prince Charles Hospital, University of Queensland, Brisbane, Australia
- Department of Anesthesiology, Division of Critical Care Medicine, University of Florida, Gainesville, FL, USA
| |
Collapse
|
9
|
Welz PJ, Thobejane MP, van Blerk GN. Ammonium oxidizing bacterial populations in South African activated sludge wastewater treatment plants. Water Environ Res 2023; 95:e10945. [PMID: 37897128 DOI: 10.1002/wer.10945] [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: 08/16/2023] [Revised: 10/09/2023] [Accepted: 10/18/2023] [Indexed: 10/29/2023]
Abstract
This is the first study that describes ammonium oxidizing bacterial populations and correlations of these populations with a range of criteria in activated sludge wastewater treatment plants in South Africa. In this study, not only the influent but also the activated sludge chemistry was comprehensively characterized. Multivariate statistical analyses were used to determine the relative significances of the geographical location (factor: site), wastewater treatment plant process (factor: configuration), seasonality (factor: season), and environmental parameters on the ammonium oxidizing bacterial genera in six municipal activated sludge wastewater treatments plants from two sites (the cities of Cape Town and Ekurhuleni). The geographical location (site) was significant for selection of the ammonium oxidizing genera (Global ANOSIM R value = 0.538, p = 0.001). It was established that the inter-site differences were not climatic in origin, nor related to the composition of the influent, but were rather driven by the activated sludge chemistry. It was found using BEST analysis that the activated sludge ammonia, activated sludge total phosphate, and activated sludge total chemical oxygen demand were the most significant (p < 0.001) drivers for ammonium oxidizing bacterial selection (ANOSIM Global R value 0.419) and were significantly higher in the activated sludge from the City of Cape Town wastewater treatment plants. Nitrosospira was the most abundant ammonium oxidizing bacterial genus, with notably higher relative and estimated actual abundances in the City of Cape Town wastewater treatment plants than the City of Ekurhuleni wastewater treatment plants. The strong selection of Nitrosospira in the City of Cape Town wastewater treatment plants with higher nutrient concentrations strongly suggests that high concentrations of activated sludge ammonia, activated sludge total phosphate, and activated sludge total chemical oxygen demand are key selective drivers for this genus. PRACTITIONER POINTS: First comprehensive study describing ammonium oxidizing bacterial populations in Southern African domestic activated sludge wastewater treatment plants. The geographical location (site) was significant for selection of different ammonium oxidizing genera (Global ANOSIM R value = 0.538, p = 0.001). Inter-site differences driven by the activated sludge chemistry, not climate or influent wastewater composition. Selection of Nitrosospira driven by high concentrations of activated sludge ammonia, total phosphate and total chemical oxygen demand.
Collapse
Affiliation(s)
- Pamela J Welz
- Applied Microbial and Health Biotechnology Institute (AMBHI), Bellville campus, Symphony Way Cape Peninsula University of Technology, Cape Town, South Africa
| | - Mfundisi P Thobejane
- Applied Microbial and Health Biotechnology Institute (AMBHI), Bellville campus, Symphony Way Cape Peninsula University of Technology, Cape Town, South Africa
- Ekurhuleni Water Care Company (ERWAT), Kempton Park, South Africa
| | | |
Collapse
|
10
|
Brabon A, Hughes KJ, Labens R. Comparison of interfragmentary compression across simulated condylar fractures repaired using four techniques. Front Vet Sci 2023; 10:1233921. [PMID: 37808116 PMCID: PMC10553202 DOI: 10.3389/fvets.2023.1233921] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2023] [Accepted: 09/08/2023] [Indexed: 10/10/2023] Open
Abstract
Introduction Equine condylar fractures are commonly repaired using cortex screws applied in lag fashion. Inadequate interfragmentary compression can lead to post-operative complications. Methods Lateral condylar fractures were simulated in 21 cadaver limbs (8 third metatarsals, 13 third metacarpals). In each limb, pressure-sensitive film (Prescale®, Fuji Photo Film Co.) was placed in each osteotomy prior to repair with 4.5 mm diameter cortex screws placed in lag fashion. Screws were placed in linear (L), triangular (T), linear plus a washer (LW) and sequentially tightened triangular configurations (TD1). All screws were tightened to a torque of 4 Nm. Pressure prints obtained were scanned using dedicated software (Fuji FPD-8010E, Fuji Photo Film Co.). A Bayesian Network (BN) model was developed to investigate the impact and interrelationship of each factor on interfragmentary compression. Sixty-three repairs (20*L, 24* T, 11*TD1, and 8*LW) performed on 21 limbs were included in the analysis. Results The BN predicted mean contact area (±s.d.) for pressures within the operating range of the prescale film [≥2.5 Megapascals (MPa) ≤ 10 MPa] by L, T, TD1 and LW repairs were 403mm2 ± (140), 411 mm2 ± (120), 403 mm2 ± (120), and 366mm2 ± (70). The mean contact area (± s.d.) created by L, T, TD1 and LW repairs at pressures >10 MPa were 112 mm2 ± (48), 167 mm2 ± (67), 142 mm2 ± (50), and 100mm2 ± (27). When pressures ≥2.5 MPA to ≤10 MPa were considered, the construct (T or L), washer and screw tightening sequence variables had a very low effect on interfragmentary contact area. At pressures >10 MPa BN sensitivity findings were 16.3, 5.03, and 0.133% for construct, washer and screw tightening sequence. The BN model indicated that triangular repair configuration had a weak influence in the ≥2.5 MPa ≤ 10 MPa range and a moderate influence in the <10 MPa range, on interfragmentary compression. The addition of a washer and the screw tightening sequence had a weak influence on interfragmentary compression at all pressure ranges. Discussion The results show that triangular repairs create larger interfragmentary contact areas at greater interfragmentary pressure in simulated condylar fractures, however it is unknown if this results in improved repair stability in the clinical scenario.
Collapse
Affiliation(s)
- Ashley Brabon
- Faculty of Science, School of Agricultural, Environmental and Veterinary Sciences, Charles Sturt University, Wagga Wagga, NSW, Australia
| | | | | |
Collapse
|
11
|
Yi H, Yang Z, Bramlage LC, Ludwig BR. Morphology and Hemodynamics of Cerebral Arteries and Aneurysms in a Rare Pair of Monozygotic Twins. Diagnostics (Basel) 2023; 13:2004. [PMID: 37370899 DOI: 10.3390/diagnostics13122004] [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: 04/11/2023] [Revised: 05/25/2023] [Accepted: 06/06/2023] [Indexed: 06/29/2023] Open
Abstract
In this preliminary study, the underlying pathophysiology mechanisms of cerebral aneurysms (CAs) in monozygotic twins (MTs) were investigated via a rare pair of MTs (twin A and twin B) involving four reconstructed arterial models using preclinical information. First, dimensions and configurated outlines of three-perspective geometries were compared. Adopting an in-vitro validated numerical CA model, hemodynamic characteristics were investigated in the MTs, respectively. Despite expected genetic similarities, morphological comparisons show that configurations of cerebral arteries exhibit significant differences between the twins. The ICA size of twin A is larger than that in twin B (2.23~25.86%), varying with specific locations, attributing to variations during embryological developments and environmental influences. Numerical modeling indicates the MTs have some hemodynamic similarities such as pressure distributions (~13,400 Pa) and their oscillatory shear index (OSI) (0~0.49), but present significant differences in local regions. Specifically, the difference in blood flow rate in the MTs is from 16% to 221%, varying with specifically compared arteries. The maximum time-averaged wall shear stress (53.6 Pa vs. 37.8 Pa) and different local OSI distributions were also observed between the MTs. The findings revealed that morphological variations in MTs could be generated by embryological and environmental factors, further influencing hemodynamic characteristics on CA pathophysiology.
Collapse
Affiliation(s)
- Hang Yi
- Department of Mechanical and Materials Engineering, Wright State University, Dayton, OH 45435, USA
| | - Zifeng Yang
- Department of Mechanical and Materials Engineering, Wright State University, Dayton, OH 45435, USA
| | - Luke C Bramlage
- Division of NeuroInterventional Surgery, Department of Neurology, Wright State University/Premier Health-Clinical Neuroscience Institute, 30E Apple St., Dayton, OH 45409, USA
- Boonshoft School of Medicine, Wright State University, Dayton, OH 45435, USA
| | - Bryan R Ludwig
- Division of NeuroInterventional Surgery, Department of Neurology, Wright State University/Premier Health-Clinical Neuroscience Institute, 30E Apple St., Dayton, OH 45409, USA
- Boonshoft School of Medicine, Wright State University, Dayton, OH 45435, USA
| |
Collapse
|
12
|
Sun Z, Tan W, Gong J, Wei G. Electrokinetic Remediation of Zn-Polluted Soft Clay Using a Novel Electrolyte Chamber Configuration. Toxics 2023; 11:263. [PMID: 36977028 PMCID: PMC10051708 DOI: 10.3390/toxics11030263] [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: 02/01/2023] [Revised: 03/07/2023] [Accepted: 03/10/2023] [Indexed: 06/18/2023]
Abstract
This study investigated a novel electrolyte chamber configuration for heavy-metal-contaminated fine-grained soil to reduce the leakage of electrolyte solution and alleviate secondary pollution, finally promoting the electrokinetic remediation (EKR) potential to be scaled up for application. Experiments were conducted on clay spiked with Zn to investigate the feasibility of the novel EKR configuration and the effect of different electrolyte compositions on the electrokinetic remedial efficiency. The results show that the electrolyte chamber situated above the soil surface is promising for the remediation of Zn-contaminated soft clay. Using 0.2 M citric acid as the anolytes and catholytes was an excellent choice for pH control in the soil and the electrolytes. Through this, the removal efficiency in different soil sections was relatively uniform and more than 90% of the initial Zn was removed. The supplementing of electrolytes resulted in the water content in the soil being distributed evenly and finally sustained at approximately 43%. Consequently, this study proved that the novel EKR configuration is suitable for fine-grained soil contaminated with Zn.
Collapse
Affiliation(s)
- Zhaohua Sun
- School of Transportation and Civil Engineering, Nantong University, Nantong 226019, China
- Key Laboratory of New Technology for Construction of Cities in Mountain Area, Ministry of Education, Chongqing University, Chongqing 400045, China
| | - Wanxia Tan
- School of Transportation and Civil Engineering, Nantong University, Nantong 226019, China
| | - Jian Gong
- Guangxi Key Laboratory of Disaster Prevention and Engineering Safety, Guangxi University, Nanning 530004, China
| | - Guowei Wei
- Jiangsu Zhongnan Construction Industry Group Co., Ltd., Nantong 226199, China
| |
Collapse
|
13
|
Liu J, Yang L, Zhang H, Zhang J, Hu Y. Effects of Allogeneic Bone Substitute Configurations on Cell Adhesion Process In Vitro. Orthop Surg 2023; 15:579-590. [PMID: 36453151 PMCID: PMC9891915 DOI: 10.1111/os.13395] [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] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/28/2021] [Revised: 06/04/2022] [Accepted: 06/17/2022] [Indexed: 12/03/2022] Open
Abstract
OBJECTIVE To explore the potential effect of three allogenic bone substitute configurations on the viability, adhesion, and spreading of osteoblasts in vitro. METHODS Freeze-dried cortical bone were ground and fractions were divided into three groups with different sizes and shapes, defined as bone fiber (0.1 mm × 0.1 mm × 3 mm), bone powder (0.45-0.9 mm), and bone granule group (3-6 mm). MC3T3-E1 cells were divided and co-cultured within groups to induce cell adhesion. The configuration of allogenic bone was captured by scanning electron microscopy and confocal laser scanning microscopy, and substrate roughness values were quantified. Cell adhesion rate was assessed using the hemocyte counting method, cell viability was determined by CCK-8 assay and live/dead staining, and cell morphology was visualized by Phalloidin and DAPI, and the mRNA expression of adhesion-related gene (vinculin) of different substitutes were determined with quantitative real-time polymerase chain reaction. RESULTS The roughness values of bone fiber, bone powder, and bone granule group were 1.878 μm (1.578-2.415 μm), 5.066 μm (3.891-6.162 μm), and 0.860 μm (0.801-1.452 μm), respectively (bone powder group compared with bone granule group, H = 18.015, P < 0.001). Similar OD values of all groups in CCK-8 assay indicated good biocompatibility of these substitutes (bone fiber, 0.201 ± 0.004; bone powder, 0.206 ± 0.008; bone granule group, 0.197 ± 0.006; and the control group, 0.202 ± 0.016, F = 0.7152, P > 0.05). In addition, representative cell adhesion rates at 24 h showed significantly lower cell adhesion rate in bone fiber group (20.3 ± 1.6%) compared to bone powder (29.3 ± 4.4%) and bone granule group (27.3 ± 3.2%) (F = 10.51,P = 0.009 and P = 0.034, respectively), but there was no significant difference between the latter two groups (P > 0.05). Interestingly, the expression of vinculin mRNA steadily decreased in a time-dependent manner. The vinculin expression reached its peak at 6 h in each group, and the vinculin levels in bone fiber, bone powder, and bone granule group were 2.119 ± 0.052, 3.842 ± 0.108, and 3.585 ± 0.068 times higher than those in the control group, respectively (F = 733.643, all P < 0.001). Meanwhile, there was a significant difference in the expression of target gene between bone powder and bone granule group (P = 0.006). CONCLUSION All allogenic bone substitutes presented an excellent cell viability. Moreover, bone powder and bone granule group were more likely to promote cell adhesion and spreading compared to bone fiber group.
Collapse
Affiliation(s)
- Jie Liu
- Tianjin Medical UniversityTianjinChina
| | - Li Yang
- Tianjin Medical UniversityTianjinChina
| | - Hao Zhang
- Tianjin Medical UniversityTianjinChina
| | | | | |
Collapse
|
14
|
Langenohl F, Rösler J, Zühlke S, Kirchhoff JL, Strohmann C. A Silicon-Stereogenic Silanol - 18 O-Isotope Labeling and Stereogenic Probe Reveals Hidden Stereospecific Water Exchange Reaction. Chemistry 2023; 29:e202202935. [PMID: 36166278 PMCID: PMC10100314 DOI: 10.1002/chem.202202935] [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: 09/20/2022] [Indexed: 01/04/2023]
Abstract
A silicon-stereogenic aminosilanol was isolated in excellent diastereomeric ratio and the absolute configuration was determined. The silanol is configurative and condensation stable in solution and shows stereoselective transformations with a clean stereospecific pathway in follow-up reactions, which leads to the isolation of a silicon-stereogenic zinc complex and siloxane compounds. Investigations with 18 O-labelled water and mass spectrometry analysis revealed an otherwise hidden exchange of oxygen atoms of silanol and water in solution that proceeds with retention of the configuration at the silicon center. This novel combination of a stereochemical probe and isotopic labeling in a silicon-stereogenic compound opens new analytic possibilities to study stereochemical courses of reactions with the aid of chiral silanols mechanistically.
Collapse
Affiliation(s)
- Felix Langenohl
- Inorganic Chemistry, TU Dortmund University, Otto-Hahn-Straße 6/6a, 44227, Dortmund, Germany
| | - Jonas Rösler
- Center for Mass Spectrometry (CMS), TU Dortmund University, Otto-Hahn-Straße 6/6a, 44227, Dortmund, Germany
| | - Sebastian Zühlke
- Center for Mass Spectrometry (CMS), TU Dortmund University, Otto-Hahn-Straße 6/6a, 44227, Dortmund, Germany
| | - Jan-Lukas Kirchhoff
- Inorganic Chemistry, TU Dortmund University, Otto-Hahn-Straße 6/6a, 44227, Dortmund, Germany
| | - Carsten Strohmann
- Inorganic Chemistry, TU Dortmund University, Otto-Hahn-Straße 6/6a, 44227, Dortmund, Germany
| |
Collapse
|
15
|
Kuettel J, Bay RC, McIsaac TL. Configuration variability of the six-minute walk test among licensed physical therapists working with neurologic conditions: a pilot survey. Physiother Theory Pract 2022:1-17. [PMID: 36345213 DOI: 10.1080/09593985.2022.2140318] [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: 09/21/2021] [Revised: 07/13/2022] [Accepted: 10/11/2022] [Indexed: 11/10/2022]
Abstract
BACKGROUND The six-minute walk test (6MWT) is considered reliable and valid for assessing walking capacity in people with neurologic conditions. However, the consistency in the test length and configuration used is unclear. PURPOSE To determine how the 6MWT was configured by licensed physical therapists working with patients with neurologic conditions in clinical practice, identify their knowledge of the American Thoracic Society (ATS) and Academy of Neurologic Physical Therapy (ANPT) guidelines for the 6MWT and assess relationships between therapist demographic characteristics and knowledge of the 6MWT guidelines. METHODS One hundred forty-six therapists completed a survey related to the configuration they used for the 6MWT. RESULTS Configuration of the 6MWT varied widely. Space limitation was the most frequently selected reason for reported configurations. Over half had available the standardized 100-feet straight walkway but fewer than one-third used this configuration of the ATS guidelines. Fewer than half knew of the ATS guidelines and nearly three-fourths knew of the ANPT guidelines. American Physical Therapy Association membership and having a higher percentage of neurologic patients were associated with knowledge of both guidelines. CONCLUSION The 6MWT must be completed within the constraints of the working environment, and this requirement is clinically relevant when comparing patient results to normative values and measurements across clinics. Our results suggest a need for updated norms that are more congruent with space constraints in current practice settings.
Collapse
Affiliation(s)
- Jamie Kuettel
- Department of Physical Therapy, Arizona School of Health Sciences, A.T. Still University, Mesa, AZ, USA
| | - Ralph Curtis Bay
- Department of Interdisciplinary Sciences, Arizona School of Health Sciences, A.T. Still University, Mesa, AZ, USA
| | - Tara L McIsaac
- Department of Physical Therapy, Arizona School of Health Sciences, A.T. Still University, Mesa, AZ, USA
| |
Collapse
|
16
|
Fisser C, Palmér O, Sallisalmi M, Paulus M, Foltan M, Philipp A, Malfertheiner MV, Lubnow M, Müller T, Broman LM. Corrigendum: Recirculation in single lumen cannula venovenous extracorporeal membrane oxygenation: A non-randomized bi-centric trial. Front Med (Lausanne) 2022; 9:1045207. [PMID: 36267622 PMCID: PMC9577499 DOI: 10.3389/fmed.2022.1045207] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2022] [Accepted: 09/16/2022] [Indexed: 12/01/2022] Open
Affiliation(s)
- Christoph Fisser
- Department of Internal Medicine II, University Medical Center Regensburg, Regensburg, Germany,*Correspondence: Christoph Fisser
| | - Oscar Palmér
- ECMO Centre Karolinska, Pediatric Perioperative Medicine and Intensive Care, Karolinska University Hospital, Stockholm, Sweden
| | - Marko Sallisalmi
- ECMO Centre Karolinska, Pediatric Perioperative Medicine and Intensive Care, Karolinska University Hospital, Stockholm, Sweden
| | - Michael Paulus
- Department of Internal Medicine II, University Medical Center Regensburg, Regensburg, Germany
| | - Maik Foltan
- Department of Cardiothoracic Surgery, University Medical Center Regensburg, Regensburg, Germany
| | - Alois Philipp
- Department of Cardiothoracic Surgery, University Medical Center Regensburg, Regensburg, Germany
| | | | - Matthias Lubnow
- Department of Internal Medicine II, University Medical Center Regensburg, Regensburg, Germany
| | - Thomas Müller
- Department of Internal Medicine II, University Medical Center Regensburg, Regensburg, Germany
| | - Lars Mikael Broman
- ECMO Centre Karolinska, Pediatric Perioperative Medicine and Intensive Care, Karolinska University Hospital, Stockholm, Sweden,Department of Physiology and Pharmacology, Karolinska Institutet, Stockholm, Sweden
| |
Collapse
|
17
|
Liang L, Yuan T, Guo X, Meng C, Lv J, Fei J, Mei S. The path of depression among frontline nurses during COVID-19 pandemic: A fuzzy-set qualitative comparative analysis. Int J Ment Health Nurs 2022; 31:1239-1248. [PMID: 35727700 PMCID: PMC9350022 DOI: 10.1111/inm.13033] [Citation(s) in RCA: 1] [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] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 05/22/2022] [Indexed: 12/23/2022]
Abstract
This study aimed to explore the combination of different conditional variables that led to depressive symptoms among frontline nurses who were fought against COVID-19 during the outbreak in Wuhan City, Hubei Province of China. The study was conducted in August 2020, which included 331 frontline clinical nurses who supported Wuhan's fight against COVID-19. The age range was 21-57 years and included 315 female nurses and 16 male nurses. This study used the fuzzy-set qualitative comparative analysis research method to explore the path of depression among frontline nurses. This study generated nine different configurations for the path of depression among frontline nurses, and had a detailed demonstration for each configuration. Each configuration distinguishes the different effects of influencing factors. For example, in the first configuration, gender, sleep disorder and PTSD exist as core conditions, while social support exists as a core condition lack. This study was presented results which was different what linear regression model reports. It takes into consideration the combined effect of each conditional variable on the development of depression. Nurse managers should pay attention to the combination of multiple influencing factors, instead of focus on single factors.
Collapse
Affiliation(s)
- Leilei Liang
- Department of Social Medicine and Health Management, School of Public Health, Jilin University, Changchun, China
| | - Tongshuang Yuan
- Department of Social Medicine and Health Management, School of Public Health, Jilin University, Changchun, China
| | - Xinmeng Guo
- Department of Social Medicine and Health Management, School of Public Health, Jilin University, Changchun, China
| | - Cuicui Meng
- Department of Social Medicine and Health Management, School of Public Health, Jilin University, Changchun, China
| | - Jianping Lv
- Department of Social Medicine and Health Management, School of Public Health, Jilin University, Changchun, China
| | - Junsong Fei
- Department of Social Medicine and Health Management, School of Public Health, Jilin University, Changchun, China
| | - Songli Mei
- Department of Social Medicine and Health Management, School of Public Health, Jilin University, Changchun, China
| |
Collapse
|
18
|
Lu Y, Zheng L, Zhang B, Li W. Configuration of prosocial motivations to enhance employees' innovation behaviors: From the perspective of coupling of basic and applied research. Front Psychol 2022; 13:958949. [PMID: 36248497 PMCID: PMC9554000 DOI: 10.3389/fpsyg.2022.958949] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2022] [Accepted: 08/16/2022] [Indexed: 11/13/2022] Open
Abstract
Prosocial motivation refers to the employees' willingness to invest for the sake of helping others. It improves basic and applied research behaviors of employees and the interaction between them. Employees' innovation behavior depends on prosocial motivation because the motivation to protect the interests of others may promote knowledge sharing and knowledge coupling. However, there is a research gap in solving the optimal solution of prosocial motivations that facilitates different types of innovation behaviors based on the combination of prosocial motivations. We perform a qualitative comparative study on the effect of the motivation configurations on innovation behaviors. We find that highly basic and highly applied research behaviors share in common collectivism-based, principlism-based, contextual, and situational motivations which work in all configurations. But the core conditions between the two are different, which are principlism-based and situational motivations, respectively. In addition, both highly basic-to-applied and highly applied-to-basic transformation behaviors share the same core condition and the same secondary conditions with highly basic and highly applied research behaviors, respectively. Moreover, the behaviors of non-highly basic research and non-highly basic-to-applied transformation share the severe absence of egoism-based motivation as the core condition in common. Non-highly behaviors of applied research and applied-to-basic transformation have a common point of the severe absence of the pressure-based type as the key. Finally, we also analyze active and passive prosocial degrees of all types of high/non-high innovation behaviors. Our study deepens the academics' thinking on multi-dimensional prosocial motivation and the classification management of coupling innovation behavior and provides implications for practice.
Collapse
Affiliation(s)
- Yuting Lu
- Fujian Academy of Social Sciences, Fuzhou, China
| | - Linlin Zheng
- Business School, Huaqiao University, Quanzhou, China
| | - Binghua Zhang
- School of Architecture and Urban-Rural Planning, Fuzhou University, Fuzhou, China
| | - Wenzhuo Li
- Business School, Hohai University, Nanjing, China
| |
Collapse
|
19
|
Wang M, Zhang X, Huang H, Qin Z, Liu C, Chen Y. Amino Acid Configuration Affects Volatile Fatty Acid Production during Proteinaceous Waste Valorization: Chemotaxis, Quorum Sensing, and Metabolism. Environ Sci Technol 2022; 56:8702-8711. [PMID: 35549463 DOI: 10.1021/acs.est.1c07894] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
During proteinaceous waste valorization to produce volatile fatty acids (VFAs), protein needs to be hydrolyzed to amino acids (AAs), but the effects of the configuration of AAs on their biotransformation and VFA production have not been investigated. In this study, more residual d-AAs than their corresponding l-AAs were observed after VFAs were produced from kitchen waste in a pilot-scale bioreactor. For all AAs investigated, the VFA production from d-AAs was lower than that from corresponding l-AAs. The metagenomics and metaproteomics analyses revealed that the l-AA fermentation system exhibited greater bacterial chemotaxis and quorum sensing (QS) than d-AAs, which benefited the establishment of functional microorganisms (such as Clostridium, Sedimentibacter, and Peptoclostridium) and expression of functional proteins (e.g., substrate transportation cofactors, l-AA dehydrogenase, and acidogenic proteins). In addition, d-AAs need to be racemized to l-AAs before being metabolized, and the difference of VFA production between d-AAs and l-AAs decreased with the increase of racemization activity. The findings of the AA configuration affecting bacterial chemotaxis and QS, which altered microorganism communities and functional protein expression, provided a new insight into the reasons for higher l-AA metabolism than d-AAs and more d-AAs left during VFA production from proteinaceous wastes.
Collapse
Affiliation(s)
- Meng Wang
- State Key Laboratory of Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, China
| | - Xuemeng Zhang
- State Key Laboratory of Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, China
| | - Haining Huang
- State Key Laboratory of Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, China
| | - Zhiyi Qin
- State Key Laboratory of Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, China
| | - Chao Liu
- State Key Laboratory of Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, China
| | - Yinguang Chen
- State Key Laboratory of Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, China
| |
Collapse
|
20
|
Wang J, Wang T, Jiang Q, Zhang Y, Qiu Y, Wang H, Yin G, Liao Y, Xie X. Configuration-Dependent Liquid Crystal and Gel Behaviors of Tetraphenylethene-Containing Main-Chain Copolyesters. Macromol Rapid Commun 2022; 43:e2200154. [PMID: 35511696 DOI: 10.1002/marc.202200154] [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: 02/19/2022] [Revised: 04/16/2022] [Indexed: 11/07/2022]
Abstract
The construction of aggregation-induced emission-active (AIE-active) gelators with liquid crystal properties remains a challenge. Moreover, it is still unclear for the effect of AIE configuration on liquid crystal, gel and AIE behaviors in one system. Herein, two main-chain liquid crystalline copolyester gelators with a single configuration of AIEgen TPE, mesogen biphenyl and pendent amide groups have been synthesized through melt polycondensation. Both copolyesters display smectic phase, while E-P20 possesses a wider temperature range of liquid crystal and a narrower layer distance owing to the more serious nonlinear "defect" of Z-TPE than E-TPE units. In addition, E-P20 and Z-P20 can form AIE-active gels with the minimum gelation concentration (MGC) values of 10 wt% and 4 wt% in ethyl acetate mainly via hydrogen bond between the pendent amide groups, respectively. These AIE-active gels show potential applications in temperature sensor, information storage, and so on. This article is protected by copyright. All rights reserved.
Collapse
Affiliation(s)
- Jing Wang
- Key Laboratory of Material Chemistry for Energy Conversion and Storage, Ministry of Education, Hubei Key Laboratory of Material Chemistry and Service Failure, Hubei Engineering Research Center for Biomaterials and Medical Protective Materials, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan, 430074, China
| | - Tian Wang
- Key Laboratory of Material Chemistry for Energy Conversion and Storage, Ministry of Education, Hubei Key Laboratory of Material Chemistry and Service Failure, Hubei Engineering Research Center for Biomaterials and Medical Protective Materials, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan, 430074, China
| | - Qian Jiang
- Key Laboratory of Material Chemistry for Energy Conversion and Storage, Ministry of Education, Hubei Key Laboratory of Material Chemistry and Service Failure, Hubei Engineering Research Center for Biomaterials and Medical Protective Materials, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan, 430074, China
| | - Yuping Zhang
- Key Laboratory of Material Chemistry for Energy Conversion and Storage, Ministry of Education, Hubei Key Laboratory of Material Chemistry and Service Failure, Hubei Engineering Research Center for Biomaterials and Medical Protective Materials, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan, 430074, China
| | - Yuan Qiu
- Key Laboratory of Material Chemistry for Energy Conversion and Storage, Ministry of Education, Hubei Key Laboratory of Material Chemistry and Service Failure, Hubei Engineering Research Center for Biomaterials and Medical Protective Materials, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan, 430074, China
| | - Hong Wang
- Key Laboratory of Material Chemistry for Energy Conversion and Storage, Ministry of Education, Hubei Key Laboratory of Material Chemistry and Service Failure, Hubei Engineering Research Center for Biomaterials and Medical Protective Materials, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan, 430074, China
| | - Guochuan Yin
- Key Laboratory of Material Chemistry for Energy Conversion and Storage, Ministry of Education, Hubei Key Laboratory of Material Chemistry and Service Failure, Hubei Engineering Research Center for Biomaterials and Medical Protective Materials, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan, 430074, China
| | - Yonggui Liao
- National Anti-counterfeit Engineering Research Center, Huazhong University of Science and Technology, Wuhan, 430074, China
| | - Xiaolin Xie
- National Anti-counterfeit Engineering Research Center, Huazhong University of Science and Technology, Wuhan, 430074, China
| |
Collapse
|
21
|
Fritsch C, Poulet Y, Bascou J, Thoreux P, Sauret C. How Was Studied the Effect of Manual Wheelchair Configuration on Propulsion Biomechanics: A Systematic Review on Methodologies. Front Rehabil Sci 2022; 3:863113. [PMID: 36189035 PMCID: PMC9397681 DOI: 10.3389/fresc.2022.863113] [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] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/26/2022] [Accepted: 03/28/2022] [Indexed: 11/13/2022]
Abstract
Background For both sports and everyday use, finding the optimal manual wheelchair (MWC) configuration can improve a user's propulsion biomechanics. Many studies have already investigated the effect of changes in MWC configuration but comparing their results is challenging due to the differences in experimental methodologies between articles. Purpose The present systematic review aims at offering an in-depth analysis of the methodologies used to study the impact of MWC configuration on propulsion biomechanics, and ultimately providing the community with recommendations for future research. Methods The reviewing process followed the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) flowchart on two databases (Scopus and PubMed) in March 2022. Results Forty-five articles were included, and the results highlighted the multiplicity of methodologies regarding different experimental aspects, including propulsion environment, experimental task, or measurement systems, for example. More importantly, descriptions of MWC configurations and their modifications differed significantly between studies and led to a lack of critical information in many cases. Discussion Studying the effect of MWC configuration on propulsion requires recommendations that must be clarified: (1) the formalism chosen to describe MWC configuration (absolute or relative) should be consistent with the type of study conducted and should be documented enough to allow for switching to the other formalism; (2) the tested MWC characteristics and initial configuration, allowing the reproduction or comparison in future studies, should be properly reported; (3) the bias induced by the experimental situation on the measured data must be considered when drawing conclusions and therefore experimental conditions such as propulsion speed or the effect of the instrumentation should be reported. Conclusion Overall, future studies will need standardization to be able to follow the listed recommendations, both to describe MWC configuration and mechanical properties in a clear way and to choose the experimental conditions best suited to their objectives.
Collapse
Affiliation(s)
- Capucine Fritsch
- Centre d'Études et de Recherche sur l'Appareillage des Handicapés, Institution Nationale des Invalides, Paris, France
- Arts et Métiers Institute of Technology, Université Sorbonne Paris Nord, IBHGC – Institut de Biomécanique Humane Georges Charpak, HESAM Université, 151 Bd de l'Hôpital, Paris, France
| | - Yoann Poulet
- Centre d'Études et de Recherche sur l'Appareillage des Handicapés, Institution Nationale des Invalides, Paris, France
| | - Joseph Bascou
- Centre d'Études et de Recherche sur l'Appareillage des Handicapés, Institution Nationale des Invalides, Paris, France
| | - Patricia Thoreux
- Hôpital Hôtel-Dieu, AP-HP, Paris, France
- Université Sorbonne Paris Nord, Arts et Métiers Institute of Technology, IBHGC – Institut de Biomécanique Humane Georges Charpak, HESAM Université, 151 Bd de l'Hôpital, Paris, France
| | - Christophe Sauret
- Centre d'Études et de Recherche sur l'Appareillage des Handicapés, Institution Nationale des Invalides, Paris, France
- Arts et Métiers Institute of Technology, Université Sorbonne Paris Nord, IBHGC – Institut de Biomécanique Humane Georges Charpak, HESAM Université, 151 Bd de l'Hôpital, Paris, France
| |
Collapse
|
22
|
Sedaghat S, Ravesh MS, Sedaghat M, Meschede J, Jansen O, Both M. Does the primary soft-tissue sarcoma configuration predict configuration of recurrent tumors on magnetic resonance imaging? Acta Radiol 2022; 63:642-651. [PMID: 33853376 DOI: 10.1177/02841851211008381] [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] [Indexed: 11/16/2022]
Abstract
BACKGROUND Soft-tissue sarcomas (STS) are rare malignancies of the soft tissue. PURPOSE To assess whether the magnetic resonance imaging (MRI) configuration of primary STS can predict the configuration of a recurring tumor and whether the MRI configuration of multiple recurrences differs in one and the same patient. MATERIAL AND METHODS Thirty-nine patients with histologically proven recurrent STS were included in this retrospective study and underwent pre- and post-treatment MRI. Three main configurations of primary and recurrent tumors were identified: polycyclic/multilobulated; ovoid/nodular; and streaky. RESULTS Sixty recurrent lesions were detected: 34 ovoid/nodular; 15 polycyclic/multilobulated; and 11 streaky. Five recurrences were multifocal and eight were bifocal. Of 39 patients, 28 (71.8%) presented one recurrence within the MRI follow-up period (P = 0.006); in 10 patients (25.6%), up to three different configurations of recurring STS were identified in one patient. Recurrences of polycyclic/multilobulated primaries were mostly ovoid/nodular (48%; P = 0.003) or polycyclic/multilobulated (37%; P = 0.014), and recurring ovoid/nodular STS significantly most often showed the same configuration as the primary tumor (85%; P < 0.001). Primary STS with a streaky configuration recurred in all three configurations in roughly equal proportions. Homogeneity/heterogeneity and tumor borders are significantly associated with the configuration of recurrences. CONCLUSION Primary STS configuration may help predict recurrent tumor configuration when the primary STS had a polycyclic/multilobulated or ovoid/nodular configuration. However, recurrent STS configuration can also differ from primary STS configuration, especially when the primary STS had a streaky configuration, rendering recurrent STS difficult to predict. Different configurations of recurrent STS in one and the same patient are common.
Collapse
Affiliation(s)
- Sam Sedaghat
- Department for Radiology and Neuroradiology, University Hospital Schleswig-Holstein, Campus Kiel, Germany
- Institute of Diagnostic and Interventional Radiology and Nuclear Medicine, University Hospital Bergmannsheil, Bochum, Germany
| | - Mona Salehi Ravesh
- Department for Radiology and Neuroradiology, University Hospital Schleswig-Holstein, Campus Kiel, Germany
| | - Maya Sedaghat
- Department for Radiology and Neuroradiology, University Hospital Schleswig-Holstein, Campus Kiel, Germany
- Institute of Diagnostic and Interventional Radiology and Nuclear Medicine, University Hospital Bergmannsheil, Bochum, Germany
| | - Jens Meschede
- Institute of Diagnostic and Interventional Radiology and Nuclear Medicine, University Hospital Bergmannsheil, Bochum, Germany
- Department for Radiology and Neuroradiology, Klinikum Dortmund, Germany
| | - Olav Jansen
- Department for Radiology and Neuroradiology, University Hospital Schleswig-Holstein, Campus Kiel, Germany
| | - Marcus Both
- Department for Radiology and Neuroradiology, University Hospital Schleswig-Holstein, Campus Kiel, Germany
| |
Collapse
|
23
|
Park S, Tandon A, Raza MT, Lee S, Nguyen TBN, Vu THN, Ha TH, Park SH. Construction and Configuration Analysis of Zelkova Serrata Lenticel-Like Patterns Generated through DNA Algorithmic Self-Assembly. ACS Appl Bio Mater 2022; 5:97-104. [PMID: 35014830 DOI: 10.1021/acsabm.1c00455] [Citation(s) in RCA: 2] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
Multiple models and simulations have been proposed and performed to understand the mechanism of the various pattern formations existing in nature. However, the logical implementation of those patterns through efficient building blocks such as nanomaterials and biological molecules is rarely discussed. This study adopts a cellular automata model to generate simulation patterns (SPs) and experimental patterns (EPs) obtained from DNA lattices similar to the discrete horizontal brown-color line-like patterns on the bark of the Zelkova serrata tree, known as lenticels [observation patterns (OPs)]. SPs and EPs are generated through the implementation of six representative rules (i.e., R004, R105, R108, R110, R126, and R218) in three-input/one-output algorithmic logic gates. The EPs obtained through DNA algorithmic self-assembly are visualized by atomic force microscopy. Three different modules (A, B, and C) are introduced to analyze the similarities between the SPs, EPs, and OPs of Zelkova serrata lenticels. Each module has unique configurations with specific orientations allowing the calculation of the deviation of the SPs and the EPs with respect to the OPs within each module. The findings show that both the SP and the EP generated under R105 and R126 and analyzed with module B provide a higher similarity of Zelkova serrata lenticel-like patterns than the other four rules. This study provides a perspective regarding the use of DNA algorithmic self-assembly for the construction of various complex natural patterns.
Collapse
Affiliation(s)
- Suyoun Park
- Department of Physics, Institute of Basic Science, and Sungkyunkwan Advanced Institute of Nanotechnology (SAINT), Sungkyunkwan University, Suwon 16419, Korea
| | - Anshula Tandon
- Department of Physics, Institute of Basic Science, and Sungkyunkwan Advanced Institute of Nanotechnology (SAINT), Sungkyunkwan University, Suwon 16419, Korea
| | - Muhammad Tayyab Raza
- Department of Physics, Institute of Basic Science, and Sungkyunkwan Advanced Institute of Nanotechnology (SAINT), Sungkyunkwan University, Suwon 16419, Korea
| | - Sungjin Lee
- Department of Physics, Institute of Basic Science, and Sungkyunkwan Advanced Institute of Nanotechnology (SAINT), Sungkyunkwan University, Suwon 16419, Korea
| | - Thi Bich Ngoc Nguyen
- Department of Physics, Institute of Basic Science, and Sungkyunkwan Advanced Institute of Nanotechnology (SAINT), Sungkyunkwan University, Suwon 16419, Korea
| | - Thi Hong Nhung Vu
- Department of Physics, Institute of Basic Science, and Sungkyunkwan Advanced Institute of Nanotechnology (SAINT), Sungkyunkwan University, Suwon 16419, Korea
| | - Tai Hwan Ha
- Core Facility Management Center, Korea Research Institute of Bioscience and Biotechnology (KRIBB), Daejeon 34141, Korea
| | - Sung Ha Park
- Department of Physics, Institute of Basic Science, and Sungkyunkwan Advanced Institute of Nanotechnology (SAINT), Sungkyunkwan University, Suwon 16419, Korea
| |
Collapse
|
24
|
Orosz L, Gyöngyösi Z, Susán Z, Siró P, Hoksbergen AW, Csiba L, Fülesdi B. Assessment of malformations, variations and diameters of vessels forming the circle of Willis - An autopsy study in a non-cerebrovascular cohort. Transl Neurosci 2022; 13:398-406. [PMID: 36406464 PMCID: PMC9644724 DOI: 10.1515/tnsci-2022-0253] [Citation(s) in RCA: 2] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2022] [Revised: 09/05/2022] [Accepted: 09/15/2022] [Indexed: 07/20/2023] Open
Abstract
BACKGROUND A PURPOSE The collateral capacity of the circle of Willis (CoW) may play an important role in the development of ischemic strokes. The occurrence of classical polygon shows wide geographical variations and morphological data on diameters of the Willisian collaterals are scarce. We aimed to assess CoW variations and vessel diameters in a Central European cohort. SUBJECTS AND METHODS CoWs were removed during routine autopsy. The morphological pattern of the circles was recorded. The prepared circles were then put between two glass plates and tightly compressed. The length of the vessels and half of the circumference were measured under a light microscope enabling measurement with an approximation of 0.1 mm. Vessel diameters were calculated from vessel circumference. RESULTS A total of 110 circles were analysed. Incomplete circles (missing one or two segments of CoW) were found in 25 cases (22.7%). Any forms of anatomical variations were detected in 14 cases (12.7%). When applying the <1 mm diameter threshold for analysis, 36 anterior communicating arteries (32.7%), 53 right posterior communicating arteries (48.2%), 73 left posterior communicating arteries (66.4%) and 18 posterior communicating arteries (16.3%) on both the sides were considered hypoplastic. CONCLUSIONS In patients without stroke in their history, complete CoW may be present in >60% of the cases. Our diameter data may serve as reference values for the Central-European population.
Collapse
Affiliation(s)
- László Orosz
- Department of Surgery, University of Debrecen, Debrecen, Hungary
| | - Zoltán Gyöngyösi
- Department of Anesthesiology and Intensive Care, University of Debrecen, H-4032, Nagyerdei krt. 98, Debrecen, Hungary
| | - Zsolt Susán
- Department of Surgery, University of Debrecen, Debrecen, Hungary
| | - Péter Siró
- Department of Anesthesiology and Intensive Care, University of Debrecen, H-4032, Nagyerdei krt. 98, Debrecen, Hungary
| | | | - László Csiba
- Department of Neurology, Faculty of Medicine, University of Debrecen, H-4032, Nagyerdei krt. 98, Debrecen, Hungary
| | - Béla Fülesdi
- Department of Anesthesiology and Intensive Care, University of Debrecen, H-4032, Nagyerdei krt. 98, Debrecen, Hungary
| |
Collapse
|
25
|
Cushman SA. Generalizing Boltzmann Configurational Entropy to Surfaces, Point Patterns and Landscape Mosaics. Entropy (Basel) 2021; 23:e23121616. [PMID: 34945922 PMCID: PMC8700675 DOI: 10.3390/e23121616] [Citation(s) in RCA: 3] [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] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/15/2021] [Revised: 11/14/2021] [Accepted: 11/23/2021] [Indexed: 11/29/2022]
Abstract
Several methods have been recently proposed to calculate configurational entropy, based on Boltzmann entropy. Some of these methods appear to be fully thermodynamically consistent in their application to landscape patch mosaics, but none have been shown to be fully generalizable to all kinds of landscape patterns, such as point patterns, surfaces, and patch mosaics. The goal of this paper is to evaluate if the direct application of the Boltzmann relation is fully generalizable to surfaces, point patterns, and landscape mosaics. I simulated surfaces and point patterns with a fractal neutral model to control their degree of aggregation. I used spatial permutation analysis to produce distributions of microstates and fit functions to predict the distributions of microstates and the shape of the entropy function. The results confirmed that the direct application of the Boltzmann relation is generalizable across surfaces, point patterns, and landscape mosaics, providing a useful general approach to calculating landscape entropy.
Collapse
Affiliation(s)
- Samuel A Cushman
- USDA Forest Service, Rocky Mountain Research Station, Flagstaff, AZ 86001, USA
| |
Collapse
|
26
|
Ganter C. Configuration space representation of MRI sequences. Magn Reson Med 2021; 87:2034-2043. [PMID: 34826167 DOI: 10.1002/mrm.29101] [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: 09/06/2021] [Revised: 10/19/2021] [Accepted: 11/08/2021] [Indexed: 11/06/2022]
Abstract
PURPOSE Local solutions provide little intuition about the contrast, generated by MRI sequences with unbalanced gradients. A configuration space representation of the spin density allows to formalize signal localization and thereby overcome these limitations. THEORY AND METHODS The continuous configuration model (CCM) constitutes a Fourier integral decomposition of the spin density, such that intrinsic tissue properties are separated from accumulated effects due to gradients and/or bulk off-resonance. Thereby, any set of local dynamic equations is automatically transformed into a corresponding set of differential equations between configurations. RESULTS The CCM generalizes the Fourier-based EPG formalism such that it becomes applicable to arbitrary MRI sequences. It enables a rigorous and concise treatment of signal localization (selective excitation, spatial encoding), inhomogeneous broadening and motion. Applied to frequency swept NMR, a close connection between SWIFT and SSFP sequences can be found. CONCLUSION The CCM allows to view arbitrary MRI sequences from a signal processing perspective, which might simplify the development and optimization of novel imaging strategies.
Collapse
Affiliation(s)
- Carl Ganter
- School of Medicine, Department of Diagnostic and Interventional Radiology, Klinikum rechts der Isar der TUM, Technical University of Munich, Munich, Germany
| |
Collapse
|
27
|
Cushman SA. Thermodynamic Consistency of the Cushman Method of Computing the Configurational Entropy of a Landscape Lattice. Entropy (Basel) 2021; 23:1420. [PMID: 34828118 PMCID: PMC8617622 DOI: 10.3390/e23111420] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [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: 09/02/2021] [Revised: 10/21/2021] [Accepted: 10/26/2021] [Indexed: 12/04/2022]
Abstract
There has been a recent surge of interest in theory and methods for calculating the entropy of landscape patterns, but relatively little is known about the thermodynamic consistency of these approaches. I posit that for any of these methods to be fully thermodynamically consistent, they must meet three conditions. First, the computed entropies must lie along the theoretical distribution of entropies as a function of total edge length, which Cushman showed was a parabolic function following from the fact that there is a normal distribution of permuted edge lengths, the entropy is the logarithm of the number of microstates in a macrostate, and the logarithm of a normal distribution is a parabolic function. Second, the entropy must increase over time through the period of the random mixing simulation, following the expectation that entropy increases in a closed system. Third, at full mixing, the entropy will fluctuate randomly around the maximum theoretical value, associated with a perfectly random arrangement of the lattice. I evaluated these criteria in a test condition involving a binary, two-class landscape using the Cushman method of directly applying the Boltzmann relation (s = klogW) to permuted landscape configurations and measuring the distribution of total edge length. The results show that the Cushman method directly applying the classical Boltzmann relation is fully consistent with these criteria and therefore fully thermodynamically consistent. I suggest that this method, which is a direct application of the classical and iconic formulation of Boltzmann, has advantages given its direct interpretability, theoretical elegance, and thermodynamic consistency.
Collapse
Affiliation(s)
- Samuel A Cushman
- USDA Forest Service, Rocky Mountain Research Station, Flagstaff, AZ 86004, USA
| |
Collapse
|
28
|
Yang J, Mori T, Wei X, Matsuda Y, Abe I. Structural Basis for Isomerization Reactions in Fungal Tetrahydroxanthone Biosynthesis and Diversification. Angew Chem Int Ed Engl 2021; 60:19458-19465. [PMID: 34180120 DOI: 10.1002/anie.202107884] [Citation(s) in RCA: 6] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2021] [Indexed: 11/08/2022]
Abstract
The novel isomerase NsrQ, from Aspergillus novofumigatus, is a key enzyme in the biosynthesis of fungal tetrahydroxanthones and is responsible for dearomatizing cyclization to provide a tetrahydroxanthone scaffold. NsrQ catalyzes a two-step isomerization reaction, involving the isomerization of allylic alcohol and subsequent inversion of configuration at the methyl group. We report on the biochemical and structural characterizations of NsrQ, and its homologue Dcr3, from Diaporthe longicolla. The crystal structures of NsrQ and Dcr3 revealed their similar overall structures, with a cone-shaped α+β barrel fold, to those of the nuclear transport factor 2-like superfamily enzymes. Furthermore, the structures of Dcr3 and NsrQ variants complexed with substrate analogues and the site-directed mutagenesis studies identified the catalytic residues and the important hydrophobic residues in shaping the active site pocket for substrate binding. These enzymes thus utilize Glu and His residues as acid-base catalysts. Based on these observations, we proposed a detailed reaction mechanism for NsrQ-catalyzed isomerization reactions.
Collapse
Affiliation(s)
- Jiali Yang
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-0033, Japan.,University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Takahiro Mori
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-0033, Japan.,Collaborative Research Institute for Innovative Microbiology, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo, 113-8657, Japan.,PRESTO Japan, Science and Technology Agency, Kawaguchi, Saitama, 332-0012, Japan
| | - Xingxing Wei
- Department of Chemistry, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong SAR, China
| | - Yudai Matsuda
- Department of Chemistry, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong SAR, China
| | - Ikuro Abe
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-0033, Japan.,Collaborative Research Institute for Innovative Microbiology, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo, 113-8657, Japan
| |
Collapse
|
29
|
Sánchez-Pedregal VM, Kertesz M, Weiss RG, Navarro-Vázquez A, Cid MM. NMR spectral fingerprint patterns as diagnostics for the unambiguous configurational analysis of the classic organo-gelator 1,3:2,4-dibenzylidene-d-sorbitol (DBS) and its derivatives. Magn Reson Chem 2021; 59:608-613. [PMID: 33368599 DOI: 10.1002/mrc.5124] [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] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/03/2020] [Revised: 12/11/2020] [Accepted: 12/17/2020] [Indexed: 06/12/2023]
Abstract
On the basis of experimental data and density functional theory (DFT) chemical shift and scalar coupling predictions, simple spectral nuclear magnetic resonance (NMR) fingerprint patterns have been established for the determination of the configuration in 1,3:2,4-dibenzylidene-d-sorbitol (DBS), a classic low molecular weight gelator, and its derivatives. The results rigorously prove the orientation of the phenyl rings in DBS that had been previously assumed in the literature on the basis of thermodynamic arguments.
Collapse
Affiliation(s)
- Víctor M Sánchez-Pedregal
- Departamento de Química Orgánica, Universidade de Santiago de Compostela, Santiago de Compostela, 15782, Spain
| | - Miklos Kertesz
- Department of Chemistry and Institute for Soft Matter Synthesis and Metrology, Georgetown University, Washington, District of Columbia, 20057-1227, USA
| | - Richard G Weiss
- Department of Chemistry and Institute for Soft Matter Synthesis and Metrology, Georgetown University, Washington, District of Columbia, 20057-1227, USA
| | - Armando Navarro-Vázquez
- Departmento de Química Fundamental, Centro de Ciências Exatas e da Natureza, Universidade Federal de Pernambuco, Recife, 50740-540, Brazil
| | - María Magdalena Cid
- Departmento de Química Orgánica and Agrupación Estratéxica CITACA, Universidade de Vigo, Vigo, 36310, Spain
| |
Collapse
|
30
|
Chen Y, Wang G, Chen C, Sun A, Feng W, Jiang W. [Design and mechanical properties of biodegradable polymeric stent]. Sheng Wu Yi Xue Gong Cheng Xue Za Zhi 2021; 37:967-973. [PMID: 33369335 DOI: 10.7507/1001-5515.202009039] [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] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
Biodegradable stents (BDSs) are the milestone in percutaneous coronary intervention(PCI). Biodegradable polymeric stents have received widespread attention due to their good biocompatibility, moderate degradation rate and degradation products without toxicity or side effects. However, due to the defects in mechanical properties of polymer materials, the clinical application of polymeric BDS has been affected. In this paper, the BDS geometric configuration design was analyzed to improve the radial strength, flexibility and reduce the shrinkage rate of biodegradable polymeric stents. And from the aspects of numerical simulation, in vitro experiment and animal experiment, the configuration design and mechanical properties of biodegradable polymeric stents were introduced in detail in order to provide further references for the development of biodegradable polymeric stents.
Collapse
Affiliation(s)
- Yu Chen
- Department of Mechanical Science and Engineering, Sichuan University, Chengdu 610065, P.R.China
| | - Guanshi Wang
- Department of Mechanical Science and Engineering, Sichuan University, Chengdu 610065, P.R.China
| | - Chong Chen
- Department of Mechanical Science and Engineering, Sichuan University, Chengdu 610065, P.R.China
| | - Anqiang Sun
- School of Biological Science and Medical Engineering, Beihang University, Beijing 100191, P.R.China
| | - Wentao Feng
- School of Biological Science and Medical Engineering, Beihang University, Beijing 100191, P.R.China
| | - Wentao Jiang
- Department of Mechanical Science and Engineering, Sichuan University, Chengdu 610065, P.R.China
| |
Collapse
|
31
|
Sedaghat S, Salehi Ravesh M, Sedaghat M, Both M, Jansen O. Configuration of soft-tissue sarcoma on MRI correlates with grade of malignancy. Radiol Oncol 2021; 55:158-63. [PMID: 33600679 DOI: 10.2478/raon-2021-0007] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [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: 11/11/2020] [Accepted: 12/14/2020] [Indexed: 11/20/2022] Open
Abstract
Background The aim of the study was to assess whether the configuration of primary soft-tissue sarcoma (STS) on MRI correlates with the grade of malignancy. Patients and methods 71 patients with histologically proven STS were included. Primary STS were examined for configuration, borders, and volume on MRI. The tumors were divided into high-grade (G3), intermediate-grade (G2) and low-grade (G1) STS according to the grading system of the French Federation of Cancer Centers Sarcoma Group (FNCLCC). Results 30 high-grade, 22 intermediate-grade and 19 low-grade primary STS lesions were identified. High- and intermediate-grade (G3/2) STS significantly most often appeared as polycyclic/multilobulated tumors (p < 0.001 and p = 0.002, respectively). Low-grade (G1) STS mainly showed an ovoid/nodular or streaky configuration (p = 0.008), and well-defined borders. The appearance of high-, intermediate- and low-grade STS with an ovoid/nodular configuration were mainly the same on MRI. All streaky G3/2 sarcoma and 17 of 20 patients with polycyclic/multilobulated G3 sarcoma showed infiltrative borders. High-grade streaky and polycyclic/multilobulated STS are larger in volume, compared to intermediate- and low-grade STS. Conclusions Configuration of STS on MRI can indicate the grade of malignancy. Higher-grade (G2/3) STS most often show a polycyclic/multilobulated configuration, while low-grade STS are mainly ovoid/nodular or streaky. Infiltrative behavior might suggest higher-grade STS in streaky and polycyclic/multilobulated STS.
Collapse
|
32
|
Chai Y, Kondhare D, Zhang A, Leonard P, Seela F. The 2-Amino Group of 8-Aza-7-deaza-7-bromopurine-2,6-diamine and Purine-2,6-diamine as Stabilizer for the Adenine-Thymine Base Pair in Heterochiral DNA with Strands in Anomeric Configuration. Chemistry 2021; 27:2093-2103. [PMID: 33090562 PMCID: PMC7898646 DOI: 10.1002/chem.202004221] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [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: 09/16/2020] [Indexed: 02/05/2023]
Abstract
Stabilization of DNA is beneficial for many applications in the fields of DNA therapeutics, diagnostics, and materials science. Now, this phenomenon is studied on heterochiral DNA, an autonomous DNA recognition system with complementary strands in α-D and β-D configuration showing parallel strand orientation. The 12-mer heterochiral duplexes were constructed from anomeric (α/β-D) oligonucleotide single-strands. Purine-2,6-diamine and 8-aza-7-deaza-7-bromopurine-2,6-diamine 2'-deoxyribonucleosides having the capability to form tridentate base pairs with dT were used to strengthen the stability of the dA-dT base pair. Tm data and thermodynamic values obtained from UV melting profiles indicated that the 8-aza-7-deaza 2'-deoxyribonucleoside decorated with a bromo substituent is so far the most efficient stabilizer for heterochiral DNA. Compared with that, the stabilizing effect of the purine-2,6-diamine 2'-deoxyribonucleoside is low. Global changes of helix structures were identified by circular dichroism (CD) spectra during melting.
Collapse
Affiliation(s)
- Yingying Chai
- Laboratory of Bioorganic Chemistry and Chemical BiologyCenter for NanotechnologyHeisenbergstrasse 1148149MünsterGermany
- Department of RespiratoryCritical Care Medicine Targeted Tracer, Research and Development LaboratoryWest China HospitalSichuan610041P. R. China
| | - Dasharath Kondhare
- Laboratory of Bioorganic Chemistry and Chemical BiologyCenter for NanotechnologyHeisenbergstrasse 1148149MünsterGermany
| | - Aigui Zhang
- Laboratory of Bioorganic Chemistry and Chemical BiologyCenter for NanotechnologyHeisenbergstrasse 1148149MünsterGermany
| | - Peter Leonard
- Laboratory of Bioorganic Chemistry and Chemical BiologyCenter for NanotechnologyHeisenbergstrasse 1148149MünsterGermany
| | - Frank Seela
- Laboratory of Bioorganic Chemistry and Chemical BiologyCenter for NanotechnologyHeisenbergstrasse 1148149MünsterGermany
- Laboratorium für Organische und Bioorganische ChemieInstitut für Chemie neuer MaterialienUniversität OsnabrückBarbarastrasse 749069OsnabrückGermany
| |
Collapse
|
33
|
Li Z, Zhang W, Kong A, Ding Z, Wei H, Guo Y. Configuration Analysis of Influencing Factors of Technical Efficiency Based on DEA and fsQCA: Evidence from China's Medical and Health Institutions. Risk Manag Healthc Policy 2021; 14:49-65. [PMID: 33447109 PMCID: PMC7802899 DOI: 10.2147/rmhp.s282178] [Citation(s) in RCA: 3] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2020] [Accepted: 12/03/2020] [Indexed: 12/04/2022] Open
Abstract
Purpose This paper aims to measure the technical efficiency of China’s medical and health institutions from 2012 to 2017 and outline the path to achieve high-quality development. Methods The DEA-Malmquist was used to evaluate the total factor productivity of medical and health institutions in 31 provinces. A fuzzy set Qualitative Comparative Analysis (fsQCA) was used for configuration analysis of determinants affecting technical efficiency. Results The average total factor productivity (TFP) of those institutions was 0.965, namely TFP declined averagely by 3.5% annually. The efficiency change and the technical change were 0.998 and 0.967, respectively. The realization paths of high technical efficiency are composed of high fatality rate and high financial allocation-led, high population density and high GDP-led. Low dependency ratio and low financial allocation-led, low fatality rate and low financial allocation-led are the main reasons for low technical efficiency. Conclusion Due to advanced medical technology and economic development, major cities like Beijing, Shanghai, and Guangdong have attracted a large number of high-level health personnel, achieving long-term and stable health business growth. Hubei, Anhui, and Sichuan also have made rapid development of health care through appropriate financial subsidies and policy supports. The technical changes in Qinghai, Yunnan, and Inner Mongolia are higher than the national average, but the operation and management level of the medical and health institutions is relatively weak. Henan, Jiangxi, and Heilongjiang have a prominent performance in the efficiency change, but the technical change is weaker than the national average.
Collapse
Affiliation(s)
- Zhiguang Li
- School of Economics and Management, Anhui University of Chinese Medicine, Hefei, Anhui, People's Republic of China
| | - Wanying Zhang
- School of Economics and Management, Anhui University of Chinese Medicine, Hefei, Anhui, People's Republic of China
| | - Aijie Kong
- School of Economics and Management, Anhui University of Chinese Medicine, Hefei, Anhui, People's Republic of China
| | - Zhiyuan Ding
- School of Economics and Management, Anhui University of Chinese Medicine, Hefei, Anhui, People's Republic of China
| | - Hua Wei
- School of Economics and Management, Anhui University of Chinese Medicine, Hefei, Anhui, People's Republic of China
| | - Yige Guo
- King's Business School, King's College London, London, UK
| |
Collapse
|
34
|
Wang K, Liu H, Chang T, Han D, Pan Y, Wang C, Bian H. Numerical Optimization Simulation of Synchronous Four-Wing Rotor. Materials (Basel) 2020; 13:E5353. [PMID: 33255845 DOI: 10.3390/ma13235353] [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] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/19/2020] [Revised: 11/21/2020] [Accepted: 11/23/2020] [Indexed: 11/27/2022]
Abstract
The mixer is the most widely used batch mixing equipment in the rubber industry. The rotor is a core component and has a great impact on the mixing effect of the equipment. The current rotor structure design is done empirically, being tightly dependent on practical experience. This paper proposes a method for optimizing the rotor structure by using optimization algorithms combined with numerical simulation technology. Using MATLAB software, a parametric design program for synchronous rotors and a set of optimization programs for the particle swarm optimization (PSO) algorithm were written. The global distribution index was used as the fitness function to optimize the synchronous rotor configuration. A comparative analysis of the rotors before and after optimization shows that the optimization process is feasible, and the results are reliable. This provides new ideas for the design and development of mixer rotors.
Collapse
|
35
|
Jung SW, Jin JW, Kim DH, Kim HS, Lee GE, Kim JW, Jang MJ. Diagnostic value of the axial view of magnetic resonance imaging to identify two-dimensional shapes of full-thickness rotator cuff tears. Acta Radiol 2020; 61:1545-1552. [PMID: 32077302 DOI: 10.1177/0284185120905098] [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] [Indexed: 12/15/2022]
Abstract
BACKGROUND Coronal and sagittal views of magnetic resonance imaging (MRI) were used to determine rotator cuff tear size and fatty infiltration, but these images were not enough to identify the tear shape. PURPOSE To correlate the preoperative axial MRI views and arthroscopic surgical findings to identify the two-dimensional shapes in rotator cuff tears. MATERIAL AND METHODS This study included 166 patients who underwent arthroscopic repair between 2015 and 2018. Preoperative coronal, sagittal, and axial MRI views were evaluated for tear size and geographic configuration in axial sections, and the length and the width were measured and were matched with arthroscopic surgical views by lateral portals. RESULTS The agreement of axial MRI views with the arthroscopic view was 88.0% in crescent, 97.2% in longitudinal, 78.6% in massive, and 100% in rotator cuff tear arthropathy. The mean agreement rate of axial MRI views with arthroscopic view was 81.9%. Mean mediolateral and anteroposterior tear sizes on axial MRI were 16.68 mm and 19.33 mm, respectively. Mean mediolateral and anteroposterior tear sizes by arthroscopic view were 21.49 mm and 21.04 mm, respectively. Tear sizes by MRI axial images were 71.3% of arthroscopic view. SST/IST degenerative changes were noted in most patients with massive tears and rotator cuff arthropathy (P = 0.001). CONCLUSION Rotator cuff tear shape on preoperative axial MRI view had close agreement (81.9%) with arthroscopic findings by lateral portal, and tear size by preoperative axial MRI views was 71.3% of that of arthroscopic view. Axial MRI views helped to predict the geometric tear shape of rotator cuff tears.
Collapse
Affiliation(s)
- Sung-Weon Jung
- Department of Orthopedic Surgery, Samsung Changwon Hospital, Sungkyunkwan University School of Medicine, Geyongsangnam-do, Republic of Korea
| | - Jin-Woo Jin
- Department of Orthopedic Surgery, Samsung Changwon Hospital, Sungkyunkwan University School of Medicine, Geyongsangnam-do, Republic of Korea
| | - Dong-Hee Kim
- Department of Orthopedic Surgery, Samsung Changwon Hospital, Sungkyunkwan University School of Medicine, Geyongsangnam-do, Republic of Korea
| | - Hyeon-Soo Kim
- Department of Orthopedic Surgery, Samsung Changwon Hospital, Sungkyunkwan University School of Medicine, Geyongsangnam-do, Republic of Korea
| | - Gwang-Eun Lee
- Department of Orthopedic Surgery, Samsung Changwon Hospital, Sungkyunkwan University School of Medicine, Geyongsangnam-do, Republic of Korea
| | - Jin-Woo Kim
- Department of Orthopedic Surgery, Samsung Changwon Hospital, Sungkyunkwan University School of Medicine, Geyongsangnam-do, Republic of Korea
| | - Min-Jae Jang
- Department of Orthopedic Surgery, Samsung Changwon Hospital, Sungkyunkwan University School of Medicine, Geyongsangnam-do, Republic of Korea
| |
Collapse
|
36
|
Magen H, Peelen MV, Emmanouil TA, Gao Z. Editorial: Understanding the Operation of Visual Working Memory in Rich Complex Visual Context. Front Psychol 2020; 11:1996. [PMID: 32982837 PMCID: PMC7483652 DOI: 10.3389/fpsyg.2020.01996] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2020] [Accepted: 07/20/2020] [Indexed: 11/13/2022] Open
Affiliation(s)
- Hagit Magen
- School of Occupational Therapy, The Hebrew University, Jerusalem, Israel
| | - Marius V. Peelen
- Donders Institute for Brain, Cognition and Behaviour, Radboud University, Nijmegen, Netherlands
| | - Tatiana Aloi Emmanouil
- Baruch College and the Graduate Center of the City University of New York, New York, NY, United States
| | - Zaifeng Gao
- Department of Psychology and Behavioral Sciences, Zhejiang University, Hangzhou, China
| |
Collapse
|
37
|
Chang Y, Qin H, Wang X, Li X, Li M, Yang H, Xu K, Qing G. Visible and Reversible Restrict of Molecular Configuration by Copper Ion and Pyrophosphate. ACS Sens 2020; 5:2438-2447. [PMID: 32648441 DOI: 10.1021/acssensors.0c00619] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Molecular configuration strongly impacts on its functions; however, due to complicated and diverse configuration as well as easy and rapid conversion among various configurations, research of molecular configuration is extremely difficult. If the free rotation of a molecule could be "slowed down" or even "frozen" by an external stimulus, such as ultralow temperature, then one configuration of the molecule could be captured and characterized relatively easily. Here, we show that the rotation of a hemicyanine-labeled 2-(2'-hydroxyphenyl)-4-methyloxazole (H-HPMO) molecule could be specifically and reversibly restricted by sequential additions of copper ion (Cu2+) and pyrophosphate (P2O74-), reflecting as remarkable fluorescence quenching and recovery, which could be directly observed by naked eyes. Binding affinity tests and cryogenic 1H NMR indicate that Cu2+ forms intensive coordinate bonds with phenolic hydroxyl, oxazole, and methoxyl groups of HPMO, which strongly restricts the free rotations of these groups and blocks charge transfer. This study provides a precise, rapid, visible, reversible, and low-cost method to monitor the molecular configuration, indicating the broad application prospects of near-infrared fluorescent sensors in configuration analysis, biosensing, and drug-substrate complexation.
Collapse
Affiliation(s)
- Yongxin Chang
- Institute of Functional Organic Molecular Engineering, College of Chemistry and Chemical Engineering, Henan University, Kaifeng 475004, P. R. China
- Key Laboratory of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian 116023, P. R. China
| | - Haijuan Qin
- Research Centre of Modern Analytical Technology, Tianjin University of Science and Technology, No. 29, 13th. Avenue, Tianjin Economic and Technological Development Area (TEDA), Tianjin 300457, P. R. China
| | - Xue Wang
- Key Laboratory of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian 116023, P. R. China
| | - Xiaopei Li
- Key Laboratory of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian 116023, P. R. China
| | - Minmin Li
- Key Laboratory of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian 116023, P. R. China
| | - Hang Yang
- Key Laboratory of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian 116023, P. R. China
| | - Kuoxi Xu
- Institute of Functional Organic Molecular Engineering, College of Chemistry and Chemical Engineering, Henan University, Kaifeng 475004, P. R. China
| | - Guangyan Qing
- Key Laboratory of Separation Science for Analytical Chemistry, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian 116023, P. R. China
- College of Chemistry and Chemical Engineering, Wuhan Textile University, 1 Sunshine Road, Wuhan 430200, P. R. China
| |
Collapse
|
38
|
Song W, Chen P, Yan J, Zhu W, Ji H. The Tribological Properties of Reduced Graphene Oxide Doped by N and B Species with Different Configurations. ACS Appl Mater Interfaces 2020; 12:29737-29746. [PMID: 32510914 DOI: 10.1021/acsami.0c03467] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Reduced graphene oxide (rGO) was doped by nitrogen (N) and/or boron (B), leading to four different configurations: N-rGO (N-doped rGO), B-rGO (B-doped rGO), N-B-rGO (N and B codoped rGO with formation of B-N bond), and N,B-rGO (N and B isolate-doped rGO without formation of B-N bond). The preparations of different configurations were controlled by the chemical vapor deposition procedure, and their structures were further confirmed by Fourier transform infrared (FTIR) spectroscopy, X-ray photoelectron spectroscopy (XPS), Raman spectroscopy, and X-ray diffraction (XRD). The tribological performance of these was tested via a ball-on-flat tribometer under 5 N load. N,B-rGO displayed better friction-reducing and antiwear performance than N-rGO and B-rGO, while N-B-rGO presented poorer tribological properties. The morphology and components of the wear track after friction were further explored, revealing that N,B-rGO can be adsorbed on the rubbing surface to form a graphene-based protective layer, while N-B-rGO cannot. In addition, first-principles calculations based on density functional theory further confirmed a stronger interfacial energy of N,B-rGO on steel surface than that of N-B-rGO on the steel surface, which was in accordance with the experimental results.
Collapse
Affiliation(s)
- Wei Song
- Fine Chemical Industry Research Institute, School of Chemistry, Sun Yat-sen University, Guangzhou 510275, China
| | - Pin Chen
- National Supercomputer Center in Guangzhou, School of Data and Computer Science, Sun Yat-Sen University, Guangzhou 510006, China
| | - Jincan Yan
- Fine Chemical Industry Research Institute, School of Chemistry, Sun Yat-sen University, Guangzhou 510275, China
- State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China
| | - Wenshuai Zhu
- School of Chemistry and Chemical Engineering, Institute for Energy Research, Jiangsu University, Zhenjiang 212013, China
| | - Hongbing Ji
- Fine Chemical Industry Research Institute, School of Chemistry, Sun Yat-sen University, Guangzhou 510275, China
- School of Chemical Engineering, Guangdong University of Petrochemical Technology, Maoming 525000, China
| |
Collapse
|
39
|
Doumani M, Habib A, Alhalak AB, Al-Nahlawi TF, Al Hussain F, Alanazi SM. Root canal morphology of mandibular canines in the Syrian population: A CBCT Assessment. J Family Med Prim Care 2020; 9:552-555. [PMID: 32318380 PMCID: PMC7113924 DOI: 10.4103/jfmpc.jfmpc_655_19] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2019] [Revised: 12/18/2019] [Accepted: 12/27/2019] [Indexed: 12/17/2022] Open
Abstract
Introduction: The recent study aimed to assess the root canal morphology of mandibular canines in the Syrian population depending on the cone beam computed tomography (CBCT) images. Materials and Methods: A total of 418 fully developed mandibular canines in Syrian individuals aged between 16 and 60 years were included. The presence of at least one mandibular right or left canine with fully developed roots was recorded in each image. The root canal configurations were classified according to the method of Vertucci. The mandibular canines were examined in sagittal, coronal, and axial dimensions. The CBCT images were evaluated by three endodontists with at least 9 years of clinical experience in endodontics. Data were analyzed with descriptive analysis and Chi-square tests using the Statistical Package for the Social Sciences (SPSS) software version 25 (SPSS Inc, Chicago, IL, USA). Results: Out of the 418 mandibular canines, 409 (97.85%) were single-rooted canines while only 9 (2.15%) were double-rooted canines. The most common type of Vertucci in single-rooted canines was Type I (1-1) in the percentage of 95.87% and the least type was Type V (1-2) in the percentage of (0.24%). The Chi-square tests showed no significant association between gender and number of roots (P = 0.64) and gender and root canal configuration in single-rooted canine (P = 0.194). Conclusion: Single-rooted with Type I canal configuration was the most common anatomy in mandibular canines in the Syrian population. Incidence of more than one root canal foramen at the end of the single root was detected in one case only.
Collapse
Affiliation(s)
- Mazen Doumani
- Department of Restorative Dental Sciences, Alfarabi Colleges of Dentistry and Nursing, Riyadh, Saudi Arabia
| | - Adnan Habib
- Department of Restorative Dental Sciences, Buraydah Colleges, College of Dentistry, Buraydah, Saudi Arabia
| | - Ahmad Basem Alhalak
- Arab Board in Oral and Maxillofacial Surgery, General Secretary Syrian Society for Research and Preventive Dentistry, Damascus, Saudi Arabia
| | - Talal Fhmi Al-Nahlawi
- Department of Endodontics and Operative Dentistry, Syrian Private University, Damascus, Syria, Saudi Arabia
| | - Fadi Al Hussain
- Department of Endodontics and Operative Dentistry, Syrian Private University, Damascus, Syria, Saudi Arabia
| | | |
Collapse
|
40
|
Remmel TK. Distributions of Hyper-Local Configuration Elements to Characterize, Compare, and Assess Landscape-Level Spatial Patterns. Entropy (Basel) 2020; 22:e22040420. [PMID: 33286194 PMCID: PMC7516897 DOI: 10.3390/e22040420] [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: 03/11/2020] [Revised: 04/02/2020] [Accepted: 04/07/2020] [Indexed: 06/12/2023]
Abstract
Even with considerable attention in recent decades, measuring and working with patterns remains a complex task due to the underlying dynamic processes that form these patterns, the influence of scales, and the many further implications stemming from their representation. This work scrutinizes binary classes mapped onto regular grids and counts the relative frequencies of all first-order configuration components and then converts these measurements into empirical probabilities of occurrence for either of the two landscape classes. The approach takes into consideration configuration explicitly and composition implicitly (in a common framework), while the construction of a frequency distribution provides a generic model of landscape structure that can be used to simulate structurally similar landscapes or to compare divergence from other landscapes. The technique is first tested on simulated data to characterize a continuum of landscapes across a range of spatial autocorrelations and relative compositions. Subsequent assessments of boundary prominence are explored, where outcomes are known a priori, to demonstrate the utility of this novel method. For a binary map on a regular grid, there are 32 possible configurations of first-order orthogonal neighbours. The goal is to develop a workflow that permits patterns to be characterized in this way and to offer an approach that identifies how relatively divergent observed patterns are, using the well-known Kullback-Leibler divergence.
Collapse
Affiliation(s)
- Tarmo K Remmel
- Department of Geography, York University, 4700 Keele Street, Toronto, ON M3J 1P3, Canada
| |
Collapse
|
41
|
Ibáñez de Opakua A, Klama F, Ndukwe IE, Martin GE, Williamson RT, Zweckstetter M. Determination of Complex Small-Molecule Structures Using Molecular Alignment Simulation. Angew Chem Int Ed Engl 2020; 59:6172-6176. [PMID: 31971323 PMCID: PMC7187346 DOI: 10.1002/anie.202000311] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [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: 01/07/2020] [Revised: 01/23/2020] [Indexed: 11/12/2022]
Abstract
Correct structural assignment of small molecules and natural products is critical for drug discovery and organic chemistry. Anisotropy-based NMR spectroscopy is a powerful tool for the structural assignment of organic molecules, but it relies on the utilization of a medium that disrupts the isotropic motion of molecules in organic solvents. Here, we establish a quantitative correlation between the atomic structure of the alignment medium, the molecular structure of the small molecule, and molecule-specific anisotropic NMR parameters. The quantitative correlation uses an accurate three-dimensional molecular alignment model that predicts residual dipolar couplings of small molecules aligned by poly(γ-benzyl-l-glutamate). The technique facilitates reliable determination of the correct stereoisomer and enables unequivocal, rapid determination of complex molecular structures from extremely sparse NMR data.
Collapse
Affiliation(s)
- Alain Ibáñez de Opakua
- Structural Biology in DementiaGerman Center for Neurodegenerative Diseases (DZNE)Von-Siebold-Strasse 3a37075GöttingenGermany
| | - Frederik Klama
- Department for NMR-based Structural BiologyMax Planck Institute for Biophysical ChemistryAm Fassberg 1137077GöttingenGermany
| | - Ikenna E. Ndukwe
- Analytical Research & Development (Rahway)Merck & Co. Inc.KenilworthNJUSA
- Complex Carbohydrate Research CenterUniversity of GeorgiaAthensGA30602USA
| | - Gary E. Martin
- Analytical Research & Development (Rahway)Merck & Co. Inc.KenilworthNJUSA
- Department of Chemistry and BiochemistrySeton Hall UniversitySouth OrangeNJ07079USA
| | - R. Thomas Williamson
- Analytical Research & Development (Rahway)Merck & Co. Inc.KenilworthNJUSA
- Department of Chemistry & BiochemistryUniversity of North Carolina WilmingtonWilmingtonNC28409USA
| | - Markus Zweckstetter
- Structural Biology in DementiaGerman Center for Neurodegenerative Diseases (DZNE)Von-Siebold-Strasse 3a37075GöttingenGermany
- Department for NMR-based Structural BiologyMax Planck Institute for Biophysical ChemistryAm Fassberg 1137077GöttingenGermany
| |
Collapse
|
42
|
Turnaturi R, Pasquinucci L, Chiechio S, Grasso M, Marrazzo A, Amata E, Dichiara M, Prezzavento O, Parenti C. Exploiting the Power of Stereochemistry in Drug Action: 3-[(2 S,6 S,11 S)-8-Hydroxy-6,11-dimethyl-1,4,5,6-tetrahydro-2,6-methano-3-benzazocin-3(2 H)-yl]- N-phenylpropanamide as Potent Sigma-1 Receptor Antagonist. ACS Chem Neurosci 2020; 11:999-1005. [PMID: 32186844 DOI: 10.1021/acschemneuro.9b00688] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [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] [Indexed: 01/27/2023] Open
Abstract
(+)-(2S,6S,11S)- and (-)-(2R,6R,11R)-Benzomorphan derivatives have a different binding affinity for sigma-1 (σ1R) and opioid receptors, respectively. In this study, we describe the synthesis of the (+)-enantiomer [(+)-LP1] of the benzomorphan MOR agonist/DOR antagonist LP1 [(-)-LP1]. The binding affinity of both (+)-LP1 and (-)-LP1 for σ1R and sigma-2 receptor (σ2R) was tested. Moreover, (+)-LP1 opioid receptor binding affinity was also investigated. Finally, (+)-LP1 was tested in a mouse model of inflammatory pain. Our results showed a nanomolar σ1R and binding affinity for (+)-LP1. Both (+)-LP1 and (-)-LP1 elicited a significant analgesic effect in a formalin test. Differently from (-)-LP1, the analgesic effect of (+)-LP1 was not reversed by naloxone, suggesting a σ1R antagonist profile. Furthermore, σ1R agonist PRE-084 was able to unmask the σ1R antagonistic component of the benzomorphan compound. (+)-LP1 could constitute an useful lead compound to develop new analgesics based on mechanisms of action alternative to opioid receptor activation.
Collapse
MESH Headings
- Analgesics/chemistry
- Analgesics/pharmacology
- Analgesics, Opioid/pharmacology
- Animals
- Benzomorphans/chemical synthesis
- Benzomorphans/pharmacology
- Disease Models, Animal
- Mice
- Pain/drug therapy
- Receptors, Opioid/drug effects
- Receptors, Opioid/metabolism
- Receptors, Opioid, delta/drug effects
- Receptors, Opioid, delta/metabolism
- Receptors, Opioid, mu/drug effects
- Receptors, Opioid, mu/metabolism
- Receptors, sigma/antagonists & inhibitors
- Structure-Activity Relationship
- Sigma-1 Receptor
Collapse
Affiliation(s)
- Rita Turnaturi
- Department of Drug Sciences, Medicinal Chemistry Section, University of Catania, Viale A. Doria 6, 95125 Catania, Italy
| | - Lorella Pasquinucci
- Department of Drug Sciences, Medicinal Chemistry Section, University of Catania, Viale A. Doria 6, 95125 Catania, Italy
| | - Santina Chiechio
- Department of Drug Sciences, Pharmacology and Toxicology Section, University of Catania, Viale A. Doria 6, 95125 Catania, Italy
- Oasi Research Institute-IRCCS, Troina 94018, Italy
| | - Margherita Grasso
- Department of Drug Sciences, Pharmacology and Toxicology Section, University of Catania, Viale A. Doria 6, 95125 Catania, Italy
- Oasi Research Institute-IRCCS, Troina 94018, Italy
| | - Agostino Marrazzo
- Department of Drug Sciences, Medicinal Chemistry Section, University of Catania, Viale A. Doria 6, 95125 Catania, Italy
| | - Emanuele Amata
- Department of Drug Sciences, Medicinal Chemistry Section, University of Catania, Viale A. Doria 6, 95125 Catania, Italy
| | - Maria Dichiara
- Department of Drug Sciences, Medicinal Chemistry Section, University of Catania, Viale A. Doria 6, 95125 Catania, Italy
| | - Orazio Prezzavento
- Department of Drug Sciences, Medicinal Chemistry Section, University of Catania, Viale A. Doria 6, 95125 Catania, Italy
| | - Carmela Parenti
- Department of Drug Sciences, Pharmacology and Toxicology Section, University of Catania, Viale A. Doria 6, 95125 Catania, Italy
| |
Collapse
|
43
|
Zhang H, Wu Z, Lan T, Chen Y, Gao P. Calculating the Wasserstein Metric-Based Boltzmann Entropy of a Landscape Mosaic. Entropy (Basel) 2020; 22:e22040381. [PMID: 33286154 PMCID: PMC7516855 DOI: 10.3390/e22040381] [Citation(s) in RCA: 9] [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: 02/09/2020] [Revised: 03/13/2020] [Accepted: 03/24/2020] [Indexed: 11/16/2022]
Abstract
Shannon entropy is currently the most popular method for quantifying the disorder or information of a spatial data set such as a landscape pattern and a cartographic map. However, its drawback when applied to spatial data is also well documented; it is incapable of capturing configurational disorder. In addition, it has been recently criticized to be thermodynamically irrelevant. Therefore, Boltzmann entropy was revisited, and methods have been developed for its calculation with landscape patterns. The latest method was developed based on the Wasserstein metric. This method incorporates spatial repetitiveness, leading to a Wasserstein metric-based Boltzmann entropy that is capable of capturing the configurational disorder of a landscape mosaic. However, the numerical work required to calculate this entropy is beyond what can be practically achieved through hand calculation. This study developed a new software tool for conveniently calculating the Wasserstein metric-based Boltzmann entropy. The tool provides a user-friendly human-computer interface and many functions. These functions include multi-format data file import function, calculation function, and data clear or copy function. This study outlines several essential technical implementations of the tool and reports the evaluation of the software tool and a case study. Experimental results demonstrate that the software tool is both efficient and convenient.
Collapse
Affiliation(s)
- Hong Zhang
- Faculty of Geosciences & Environmental Engineering, Southwest Jiaotong University, Chengdu 611756, China
| | - Zhiwei Wu
- Faculty of Geosciences & Environmental Engineering, Southwest Jiaotong University, Chengdu 611756, China
- State Key Laboratory of Earth Surface Processes and Resource Ecology, Beijing Normal University, Beijing 100875, China
- Faculty of Geographical Science, Beijing Normal University, Beijing 100875, China
| | - Tian Lan
- Department of Land Surveying and Geoinformatics, The Hong Kong Polytechnic University, Kowloon, Hong Kong
| | - Yanyu Chen
- Faculty of Geosciences & Environmental Engineering, Southwest Jiaotong University, Chengdu 611756, China
| | - Peichao Gao
- State Key Laboratory of Earth Surface Processes and Resource Ecology, Beijing Normal University, Beijing 100875, China
- Faculty of Geographical Science, Beijing Normal University, Beijing 100875, China
- Department of Land Surveying and Geoinformatics, The Hong Kong Polytechnic University, Kowloon, Hong Kong
- Correspondence: ; Tel.: +86-10-5880-2788
| |
Collapse
|
44
|
Cruz-López F, Jimenez Gonzalez A, Alan Barber F, Cobaleda-Aristizabal AF. Biomechanical comparison of conventional double-row repair versus double row repair with the parachute configuration. Acta Ortop Mex 2020; 34:87-90. [PMID: 33244907] [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] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
INTRODUCTION The rotator cuff tears are a very frequent condition. The rotator cuff repair is a procedure often perform by the orthopedic surgeon. There are multiple techniques and suture configurations for this type of repairs. The double row configuration is one of the most used and consider very effective for mid-size and large size rotator cuff tears. The parachute configuration for this repair is a novel technique that may be useful for mid-size and large size tears, for this repair two medial double row anchors are used and one knotless lateral anchor. Our porpoise was to compare biomechanical performance and footprint coverage of a conventional suture-bridge double-row rotator cuff repair configuration versus a double-row-parachute. METHODS This paper shows the biomechanical behavior on a cadaver model of the parachute configuration, and also compares this conformation with a double row in a suture-bridge fashion. Our hipothesis was that the Parachute configurations biomechanical performance is equivalent to the suture-bridging double-row technique. RESULTS The parachute configuration advantages show the advantage of using less anchors, which will decrease the surgical time and also the risks of using multiple hardware in the humeral head.
Collapse
Affiliation(s)
- F Cruz-López
- Instituto Nacional de Rehabilitación «Dr. Luis Guillermo Ibarra Ibarra». Av. México-Xochimilco 289, C.P. 14389. Ciudad de México. México
| | | | | | | |
Collapse
|
45
|
Doumani M, Habib A, Alhenaky MA, Alotaibi KSH, Alanazi MS, Alsalhani A. Root canal treatment of mandibular canine with two root canals: A case report series. J Family Med Prim Care 2019; 8:3763-3765. [PMID: 31803689 PMCID: PMC6881961 DOI: 10.4103/jfmpc.jfmpc_782_19] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2019] [Revised: 09/17/2019] [Accepted: 09/26/2019] [Indexed: 11/04/2022] Open
Abstract
Canine is the cornerstone of the mouth due to its position, which reflects its significance of mastication with incisors and premolars. Anomalous root canal morphology can be found in any tooth with different degrees. The unusual configuration of root canal system may lead to a lot of procedural errors during cleaning and shaping, and this, in turn, may increase the probability of root canal treatment failure. In most cases, mandibular canines have one root of a centrally located root canal and 15% of this type of tooth has two root canals.
Collapse
Affiliation(s)
- Mazen Doumani
- Department of Restorative Dental Sciences, Al Farabi Dental College, Riyadh, Saudi Arabia
| | - Adnan Habib
- Department of Restorative Dental Sciences, Al Farabi Dental College, Riyadh, Saudi Arabia
| | - Maram A Alhenaky
- Department of Restorative Dental Sciences, Al Farabi Dental College, Riyadh, Saudi Arabia
| | | | - Maali S Alanazi
- Department of Restorative Dental Sciences, Al Farabi Dental College, Riyadh, Saudi Arabia
| | - Anas Alsalhani
- Department of Oral Medicine and Diagnostic Sciences, Al Farabi Dental College, Riyadh, Saudi Arabia
| |
Collapse
|
46
|
Brodsky D, Shepley MM. Comparative Study of the Social Interactions of Two Differently Designed Long-Term Care Facilities for Individuals With Acquired Brain Injury. HERD 2019; 13:84-98. [PMID: 31779488 DOI: 10.1177/1937586719888847] [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] [Indexed: 11/17/2022]
Abstract
AIM This study focused on long-term care (LTC) settings for individuals with acquired brain injury (ABI). The goals were (1) to assess the impact of facility configuration on social interactions between residents and staff and (2) obtain a better understanding of staff and resident perceptions of the built environment. BACKGROUND A few studies have explored the relationship between the built environment and social interaction in LTC facilities, but there is little empirical data about ABI-specific LTC facilities. METHODS A literature review was conducted on the impact of the built environment on the LTC of brain injury survivors. Via a questionnaire, staff and residents in two settings, one with patient rooms off corridors and the other with patient rooms surrounding a common space, rated the effectiveness of the built environment in promoting social interaction. Behavioral observation was conducted on 18 residents for a duration of 4 hr per resident. RESULTS Via questionnaires, staff rated the corridor facility as more effective in promoting social interaction, but no significant differences were found between the assessments of the two resident populations. Contrary to staff questionnaire results, residents in the open configuration facility exhibited more social behaviors. CONCLUSIONS Building configuration may impact social interaction between staff and residents in ABI-specific LTC facilities and potentially impact staff and resident quality of life. However, configuration cannot be viewed in a vacuum; residents' physical and mental limitations, demographic information, and staff engagement must be also considered.
Collapse
|
47
|
Domhan C, Uhl P, Kleist C, Zimmermann S, Umstätter F, Leotta K, Mier W, Wink M. Replacement of l-Amino Acids by d-Amino Acids in the Antimicrobial Peptide Ranalexin and Its Consequences for Antimicrobial Activity and Biodistribution. Molecules 2019; 24:E2987. [PMID: 31426494 DOI: 10.3390/molecules24162987] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [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: 08/01/2019] [Revised: 08/12/2019] [Accepted: 08/16/2019] [Indexed: 01/09/2023] Open
Abstract
Infections caused by multidrug-resistant bacteria are a global emerging problem. New antibiotics that rely on innovative modes of action are urgently needed. Ranalexin is a potent antimicrobial peptide (AMP) produced in the skin of the American bullfrog Rana catesbeiana. Despite strong antimicrobial activity against Gram-positive bacteria, ranalexin shows disadvantages such as poor pharmacokinetics. To tackle these problems, a ranalexin derivative consisting exclusively of d-amino acids (named danalexin) was synthesized and compared to the original ranalexin for its antimicrobial potential and its biodistribution properties in a rat model. Danalexin showed improved biodistribution with an extended retention in the organisms of Wistar rats when compared to ranalexin. While ranalexin is rapidly cleared from the body, danalexin is retained primarily in the kidneys. Remarkably, both peptides showed strong antimicrobial activity against Gram-positive bacteria and Gram-negative bacteria of the genus Acinetobacter with minimum inhibitory concentrations (MICs) between 4 and 16 mg/L (1.9–7.6 µM). Moreover, both peptides showed lower antimicrobial activities with MICs ≥32 mg/L (≥15.2 µM) against further Gram-negative bacteria. The preservation of antimicrobial activity proves that the configuration of the amino acids does not affect the anticipated mechanism of action, namely pore formation.
Collapse
|
48
|
Yellinek S, Krizzuk D, Moreno Djadou T, Lavy D, Wexner SD. Endorectal advancement flap for complex anal fistula: does flap configuration matter? Colorectal Dis 2019; 21:581-587. [PMID: 30673146 DOI: 10.1111/codi.14564] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/08/2018] [Accepted: 01/08/2019] [Indexed: 12/23/2022]
Abstract
AIM Treatment of complex anal fistula (CAF) is challenging, often requiring multiple operations due to a high failure rate. The plethora of options attests to the lack of a panacea. Endorectal advancement flap (ERAF) carries the advantages of no sphincter division, no contour defect to the anal canal and no perineal wound. The failure rate of this procedure ranges between 15% and 60%. Although the procedure traditionally described a rhomboid (tongue-shaped) flap, an elliptical (curvilinear) flap was introduced to try to improve the results. This study aimed to describe the elliptical-shaped ERAF performed by the senior authors and others and compare failure rates between elliptical and rhomboid ERAFs for CAF. METHOD A retrospective review of all patients who underwent ERAF for CAF between 2011 and 2017 was undertaken. Patients were divided into two groups based on the type of flap: rhomboid or elliptical. The main outcomes measures were postoperative persistent or recurrent fistula. RESULTS Seventy-six ERAF procedures for CAF were identified in 71 patients; 39 had a classic rhomboid flap and 37 had an elliptical configuration with mean follow-up of 13.8 and 13.9 months, respectively. The groups were similar for demographic parameters and preoperative fistula characteristics. The overall failure rate was 37%, with a success rate of 64% in the rhomboid and 62% in the elliptical group. CONCLUSION The shape of the ERAF for treatment of CAF does not appear to influence failure rate.
Collapse
Affiliation(s)
- S Yellinek
- Department of Colorectal Surgery, Cleveland Clinic Florida, Weston, Florida, USA
| | - D Krizzuk
- Department of Colorectal Surgery, Cleveland Clinic Florida, Weston, Florida, USA
| | - T Moreno Djadou
- Department of Colorectal Surgery, Cleveland Clinic Florida, Weston, Florida, USA
| | - D Lavy
- Department of Colorectal Surgery, Cleveland Clinic Florida, Weston, Florida, USA
| | - S D Wexner
- Department of Colorectal Surgery, Cleveland Clinic Florida, Weston, Florida, USA
| |
Collapse
|
49
|
Florean C, Kim KR, Schnekenburger M, Kim HJ, Moriou C, Debitus C, Dicato M, Al-Mourabit A, Han BW, Diederich M. Synergistic AML Cell Death Induction by Marine Cytotoxin (+)-1( R), 6( S), 1'( R), 6'( S), 11( R), 17( S)-Fistularin-3 and Bcl-2 Inhibitor Venetoclax. Mar Drugs 2018; 16:md16120518. [PMID: 30572618 PMCID: PMC6316187 DOI: 10.3390/md16120518] [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] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2018] [Revised: 12/13/2018] [Accepted: 12/14/2018] [Indexed: 11/23/2022] Open
Abstract
Treatment of acute myeloid leukemia (AML) patients is still hindered by resistance and relapse, resulting in an overall poor survival rate. Recently, combining specific B-cell lymphoma (Bcl)-2 inhibitors with compounds downregulating myeloid cell leukemia (Mcl)-1 has been proposed as a new effective strategy to eradicate resistant AML cells. We show here that 1(R), 6(S), 1’(R), 6’(S), 11(R), 17(S)-fistularin-3, a bromotyrosine compound of the fistularin family, isolated from the marine sponge Suberea clavata, synergizes with Bcl-2 inhibitor ABT-199 to efficiently kill Mcl-1/Bcl-2-positive AML cell lines, associated with Mcl-1 downregulation and endoplasmic reticulum stress induction. The absolute configuration of carbons 11 and 17 of the fistularin-3 stereoisomer was fully resolved in this study for the first time, showing that the fistularin we isolated from the marine sponge Subarea clavata is in fact the (+)-11(R), 17(S)-fistularin-3 stereoisomer keeping the known configuration 1(R), 6(S), 1’(R), and 6’(S) for the verongidoic acid part. Docking studies and in vitro assays confirm the potential of this family of molecules to inhibit DNA methyltransferase 1 activity.
Collapse
MESH Headings
- Animals
- Antineoplastic Combined Chemotherapy Protocols/pharmacology
- Bridged Bicyclo Compounds, Heterocyclic/administration & dosage
- Bridged Bicyclo Compounds, Heterocyclic/pharmacology
- Cell Line, Tumor
- Cell Survival/drug effects
- Drug Screening Assays, Antitumor
- Drug Synergism
- Endoplasmic Reticulum Stress/drug effects
- HL-60 Cells
- Humans
- Isoxazoles/administration & dosage
- Isoxazoles/chemistry
- Isoxazoles/isolation & purification
- Isoxazoles/pharmacology
- Leukemia, Myeloid, Acute/drug therapy
- Leukemia, Myeloid, Acute/metabolism
- Leukemia, Myeloid, Acute/pathology
- Molecular Docking Simulation
- Porifera/chemistry
- Proto-Oncogene Proteins c-bcl-2/antagonists & inhibitors
- Proto-Oncogene Proteins c-bcl-2/metabolism
- Sulfonamides/administration & dosage
- Sulfonamides/pharmacology
- Tyrosine/administration & dosage
- Tyrosine/analogs & derivatives
- Tyrosine/chemistry
- Tyrosine/isolation & purification
- Tyrosine/pharmacology
- U937 Cells
Collapse
Affiliation(s)
- Cristina Florean
- Laboratoire de Biologie Moléculaire et Cellulaire du Cancer, Hôpital Kirchberg, 9, rue Edward Steichen, L-2540 Luxembourg, Luxembourg.
| | - Kyung Rok Kim
- Department of Pharmacy, Research Institute of Pharmaceutical Sciences, College of Pharmacy, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Korea.
| | - Michael Schnekenburger
- Laboratoire de Biologie Moléculaire et Cellulaire du Cancer, Hôpital Kirchberg, 9, rue Edward Steichen, L-2540 Luxembourg, Luxembourg.
| | - Hyun-Jung Kim
- College of Pharmacy, Chung-Ang University, 84 Heukseok-ro, Dongjak-gu, Seoul 06974, Korea.
| | - Céline Moriou
- Institut de Chimie des Substances Naturelles, CNRS UPR 2301, Univ. Paris-Sud, University of Paris-Saclay, 1, Avenue de la Terrasse, 91198 Gif-Sur-Yvette, France.
| | - Cécile Debitus
- LEMAR, IRD, UBO, CNRS, IFREMER, IUEM, 29280 Plouzané, France.
| | - Mario Dicato
- Laboratoire de Biologie Moléculaire et Cellulaire du Cancer, Hôpital Kirchberg, 9, rue Edward Steichen, L-2540 Luxembourg, Luxembourg.
| | - Ali Al-Mourabit
- Institut de Chimie des Substances Naturelles, CNRS UPR 2301, Univ. Paris-Sud, University of Paris-Saclay, 1, Avenue de la Terrasse, 91198 Gif-Sur-Yvette, France.
| | - Byung Woo Han
- Department of Pharmacy, Research Institute of Pharmaceutical Sciences, College of Pharmacy, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Korea.
| | - Marc Diederich
- Department of Pharmacy, Research Institute of Pharmaceutical Sciences, College of Pharmacy, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Korea.
| |
Collapse
|
50
|
Perrone M, Orr R, Hing W, Milne N, Pope R. The Impact of Backpack Loads on School Children: A Critical Narrative Review. Int J Environ Res Public Health 2018; 15:E2529. [PMID: 30424517 PMCID: PMC6267109 DOI: 10.3390/ijerph15112529] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/06/2018] [Revised: 11/05/2018] [Accepted: 11/06/2018] [Indexed: 11/16/2022]
Abstract
Background: Backpack loads of school students during school days have been suggested to range from 10% to as high as 25% of their body weight and may have a negative impact on their body. The aim of this review was to identify and review studies that have examined impacts of contemporary backpack loads on school children. Methods: A systematic search was conducted of the literature using key search terms. After relevant studies published in recent years were selected using strict inclusion and exclusion criteria, the studies were critically appraised and relevant data were extracted and tabulated prior to conducting a critical narrative synthesis of findings. Results: Twenty-one studies were included, ranging in methodological quality from poor to good (critical appraisal scores 22% to 77%). Students carried on average over 15% of their own body weight, which caused biomechanical and physiological adaptations that could increase musculoskeletal injury risk, fatigue, redness, swelling and discomfort. Conclusion: Considering the limited methodological quality and variations in foci across studies, further research is needed to elucidate: (1) the loads students carry around on a school day in their school backpacks and; (2) the biomechanical, physiological and physical effects of load carriage on students.
Collapse
Affiliation(s)
- Michelle Perrone
- Bond Institute of Health and Sport, Bond University, Gold Coast, QLD 4229, Australia.
| | - Robin Orr
- Bond Institute of Health and Sport, Bond University, Gold Coast, QLD 4229, Australia.
| | - Wayne Hing
- Bond Institute of Health and Sport, Bond University, Gold Coast, QLD 4229, Australia.
| | - Nikki Milne
- Bond Institute of Health and Sport, Bond University, Gold Coast, QLD 4229, Australia.
| | - Rodney Pope
- School of Community Health, Charles Sturt University, Albury-Wodonga, NSW 2640, Australia.
| |
Collapse
|