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Bera D, Sarkar R, Dhar T, Saha P, Ghosh P, Mukhopadhyay C. DMSO promoted catalyst-free oxidative C-N/C-O couplings towards synthesis of imidazoles and oxazoles. Org Biomol Chem 2024. [PMID: 38624070 DOI: 10.1039/d4ob00383g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/17/2024]
Abstract
Dimethyl sulfoxide (DMSO)-promoted catalyst-free oxidative C-N coupling and C-O coupling under oxidant-free conditions are outlined. This protocol is operationally simple and leads to various functionalized substituted imidazoles or oxazoles in good yields. To date, a very limited number of oxidation protocols have been established, where DMSO acts solely as a catalyst or an oxidant or both. In this report, DMSO is not only used as a C-N/C-O coupling agent but is also used as the oxidant required for these oxidative transformations. Hence, our demonstrated DMSO-promoted catalyst-free coupling transformation has the ability to lead to a new dimension in the field of oxidative coupling.
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Affiliation(s)
- Debasish Bera
- Department of Chemistry, University of Calcutta, 92 APC Road, Kolkata-700009, India.
| | - Rajib Sarkar
- Department of Chemistry, Prabhu Jagatbandhu College, Jhorehat, Andul-Mouri, Howrah-711302, India
| | - Tiyasa Dhar
- Department of Chemistry, University of Calcutta, 92 APC Road, Kolkata-700009, India.
| | - Pinaki Saha
- Department of Chemistry, R. K. Mission Residential College, Narendrapur, Kolkata-700103, India
| | - Prasanta Ghosh
- Department of Chemistry, R. K. Mission Residential College, Narendrapur, Kolkata-700103, India
| | - Chhanda Mukhopadhyay
- Department of Chemistry, University of Calcutta, 92 APC Road, Kolkata-700009, India.
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2
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Onajah S, Sarkar R, Islam MS, Lalley M, Khan K, Demir M, Abdelhamid HN, Farghaly AA. Silica-Derived Nanostructured Electrode Materials for ORR, OER, HER, CO 2RR Electrocatalysis, and Energy Storage Applications: A Review. CHEM REC 2024; 24:e202300234. [PMID: 38530060 DOI: 10.1002/tcr.202300234] [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: 07/03/2023] [Revised: 02/13/2024] [Indexed: 03/27/2024]
Abstract
Silica-derived nanostructured catalysts (SDNCs) are a class of materials synthesized using nanocasting and templating techniques, which involve the sacrificial removal of a silica template to generate highly porous nanostructured materials. The surface of these nanostructures is functionalized with a variety of electrocatalytically active metal and non-metal atoms. SDNCs have attracted considerable attention due to their unique physicochemical properties, tunable electronic configuration, and microstructure. These properties make them highly efficient catalysts and promising electrode materials for next generation electrocatalysis, energy conversion, and energy storage technologies. The continued development of SDNCs is likely to lead to new and improved electrocatalysts and electrode materials. This review article provides a comprehensive overview of the recent advances in the development of SDNCs for electrocatalysis and energy storage applications. It analyzes 337,061 research articles published in the Web of Science (WoS) database up to December 2022 using the keywords "silica", "electrocatalysts", "ORR", "OER", "HER", "HOR", "CO2RR", "batteries", and "supercapacitors". The review discusses the application of SDNCs for oxygen reduction reaction (ORR), oxygen evolution reaction (OER), hydrogen evolution reaction (HER), carbon dioxide reduction reaction (CO2RR), supercapacitors, lithium-ion batteries, and thermal energy storage applications. It concludes by discussing the advantages and limitations of SDNCs for energy applications.
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Affiliation(s)
- Sammy Onajah
- Chemical Sciences and Engineering Division, Argonne National Laboratory, Lemont, Illinois, 60439, United States
- Pritzker School of Molecular Engineering, The University of Chicago, Chicago, Illinois, 60637, United States
| | - Rajib Sarkar
- Department of Chemistry, Virginia Commonwealth University, Richmond, Virginia, 23284-2006, United States
| | - Md Shafiul Islam
- Chemical Sciences and Engineering Division, Argonne National Laboratory, Lemont, Illinois, 60439, United States
| | - Marja Lalley
- Department of Chemistry, University of Chicago, Chicago, Illinois, 60637, United States
| | - Kishwar Khan
- Department of Chemistry, City University of Hong Kong, Hong Kong, 999077, China
| | - Muslum Demir
- Department of Chemical Engineering, Bogazici University, 34342, Istanbul, Turkey
- TUBITAK Marmara Research Center, Material Institute, Gebze, 41470, Turkey
| | - Hani Nasser Abdelhamid
- Advanced Multifunctional Materials Laboratory, Department of Chemistry, Assiut University, Assiut, 71516, Egypt
- Egyptian Russian University, Badr City, Cairo, 11829, Egypt
| | - Ahmed A Farghaly
- Chemical Sciences and Engineering Division, Argonne National Laboratory, Lemont, Illinois, 60439, United States
- Pritzker School of Molecular Engineering, The University of Chicago, Chicago, Illinois, 60637, United States
- Chemistry Department, Faculty of Science, Assiut University, Assiut, 71516, Egypt
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3
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Bandyopadhyay A, Biswas P, Kundu SK, Sarkar R. Electrochemistry-enabled residue-specific modification of peptides and proteins. Org Biomol Chem 2024; 22:1085-1101. [PMID: 38231504 DOI: 10.1039/d3ob01857a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2024]
Abstract
Selective chemical reactions at precise amino acid residues of peptides and proteins have become an exploding field of research in the last few decades. With the emerging utility of bioconjugated peptides and proteins as drug leads and therapeutic agents, the design of smart protocols to modulate and conjugate biomolecules has become necessary. During this modification, the most important concern of biochemists is to keep intact the structural integrity of the biomolecules. Hence, a soft and selective biocompatible reaction environment is necessary. Electrochemistry, a mild and elegant tunable reaction platform to synthesize complex molecules while avoiding harsh and toxic chemicals, can provide such a reaction condition. However, this strategy is yet to be fully exploited in the field of selective modification of polypeptides. With this possibility, the use of electrochemistry as a reaction toolbox in peptide and protein chemistry is flourishing day by day. Unfortunately, there is no suitable review article summarizing the residue-specific modification of biomolecules. The present review provides a comprehensive summary of the latest manifested electrochemical approaches for the modulation of five redox-active amino acid residues, namely cysteine, tyrosine, tryptophan, histidine and methionine, found in peptides and proteins. The article also highlights the incredible potential of electrochemistry for the regio- as well as chemoselective bioconjugation strategy of biomolecules.
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Affiliation(s)
- Ayan Bandyopadhyay
- Department of Chemistry, Chapra Government College, Nadia-741123, West Bengal, India
| | - Pranay Biswas
- Department of Physics, Dinabandhu Mahavidyalaya, 24 Parganas (N), 743235, West Bengal, India
| | - Sudipta K Kundu
- Department of Chemistry, Muragachha Government College, Nadia-741154, West Bengal, India.
| | - Rajib Sarkar
- Department of Chemistry, Muragachha Government College, Nadia-741154, West Bengal, India.
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Sarkar R, Graves LS, Taylor JR, Arachchige IU. Self-Supported Ag/Pt/Pd Alloy Aerogels as High-Performance Bifunctional and Durable Electrocatalysts for Methanol and Ethanol Oxidation Reactions. ACS Appl Mater Interfaces 2023. [PMID: 37903332 DOI: 10.1021/acsami.3c07740] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/01/2023]
Abstract
Assembly of nanoparticles (NPs) into functional macrostructures is imperative for the development of NP-based devices. However, existing methods employ insulating organic ligands, polymers, and biomolecules as mediators for the NP assembly, which are detrimental for charge transport and interparticle coupling that impede the efficient integration of low-dimensional properties. Herein, we report a methodology for the direct self-supported assembly of Ag/Pt/Pd alloy NPs into high surface area (119.1 ± 3.9 to 140.1 ± 5.7 m2/g), mesoporous (19.7 ± 6.2 to 23.0 ± 1.6 nm), and conducting nanostructures (aerogels) that show superior electrocatalytic activity and stability in methanol (MOR) and ethanol (EOR) oxidation reactions. Ultrasmall (3.9 ± 1.3 nm) and quasi-spherical Ag/Pt/Pd alloy NPs were synthesized via stepwise galvanic replacement reaction (GRR) of glutathione (GSH)-coated Ag NPs. As-synthesized NPs were transformed into free-standing alloy hydrogels via chemical oxidation of the GSH ligands. The composition of alloy aerogels was tuned by varying the oxidant/thiolate molar ratio of the precursor NP sol that prompts Ag dealloying with in situ generated HNO3, selectively enriching the Pt and Pd catalytic sites on the aerogel surface. The highest-performing alloy aerogel (Ag0.449Pt0.480Pd0.071) demonstrates excellent mass activity for methanol (3179.5 mA/mg) and ethanol (2444.5 mA/mg) electro-oxidation reactions, which are ∼4-5 times higher than those of commercial Pt/C and Pd/C electrocatalysts. The aerogel also maintained high alcohol oxidation activity for 17 h at a constant potential of -0.3 V in an alkaline medium. The synergistic effects of noble metal alloying, high surface area and mesoporosity, and the pristine active surface of aerogels provide efficient interaction of analytes with the nanostructure surface, facilitating both MOR and EOR activity and improving tolerance for poisonous byproducts, enabling the Ag/Pt/Pd alloy aerogel a promising (electro)catalyst for a number of new technologies.
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Affiliation(s)
- Rajib Sarkar
- Department of Chemistry, Virginia Commonwealth University, Richmond, Virginia 23284-2006, United States
| | - Lisa S Graves
- Department of Chemistry, Virginia Commonwealth University, Richmond, Virginia 23284-2006, United States
| | - Jessie R Taylor
- Department of Chemistry, Virginia Commonwealth University, Richmond, Virginia 23284-2006, United States
| | - Indika U Arachchige
- Department of Chemistry, Virginia Commonwealth University, Richmond, Virginia 23284-2006, United States
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Kyndiah L, Sarkar FK, Gajurel S, Sarkar R, Anal JMH, Pal AK. Pd@GO catalyzed stereo- and regio-selective addition of arenes to alkynes and synthesis of coumarins via C-H functionalization. Org Biomol Chem 2023; 21:7928-7934. [PMID: 37766675 DOI: 10.1039/d3ob01237a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/29/2023]
Abstract
A stereo- and regio-selective addition of arenes to alkynes via C-H bond functionalization has been developed using palladium nanoparticles supported on graphite oxide (Pd@GO) as the reusable catalyst. The prepared catalyst was characterized by various spectroscopic techniques such as FT-IR, TEM, SEM, EDX, P-XRD, and XPS analysis. The thermal stability of the catalyst was established by TGA. The C-H functionalized products were obtained in good to excellent yields (69-92%) at room temperature. The methodology further extended to the synthesis of biologically and pharmaceutically important coumarin molecules from phenols and alkynes. Good to excellent yields of the coumarins (74-92%) were obtained. After the reaction, the catalyst was separated by centrifugation followed by filtration. The recovered catalyst was washed and reused up to five cycles. The advantages of this method are the simple procedure of the catalyst preparation, high catalytic efficiency, high selectivity, good functional group tolerance, low catalyst loading, and gram-scale synthesis.
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Affiliation(s)
- Lenida Kyndiah
- Department of Chemistry, Centre for Advanced Studies, North-Eastern Hill University, Shillong-793022, Meghalaya, India.
| | - Fillip Kumar Sarkar
- Department of Chemistry, Centre for Advanced Studies, North-Eastern Hill University, Shillong-793022, Meghalaya, India.
| | - Sushmita Gajurel
- Department of Chemistry, Centre for Advanced Studies, North-Eastern Hill University, Shillong-793022, Meghalaya, India.
| | - Rajib Sarkar
- Department of Chemistry, Centre for Advanced Studies, North-Eastern Hill University, Shillong-793022, Meghalaya, India.
| | - Jasha Momo H Anal
- Natural Products & Medicinal Chemistry Division, CSIR-Indian Institute of Integrative Medicine, Jammu, Canal Road, Jammu-180001, India
| | - Amarta Kumar Pal
- Department of Chemistry, Centre for Advanced Studies, North-Eastern Hill University, Shillong-793022, Meghalaya, India.
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6
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Sarkar FK, Kyndiah L, Gajurel S, Sarkar R, Jana S, Pal AK. A sustainable avenue for the synthesis of propargylamines and benzofurans using a Cu-functionalized MIL-101(Cr) as a reusable heterogeneous catalyst. Sci Rep 2023; 13:12908. [PMID: 37558730 PMCID: PMC10412598 DOI: 10.1038/s41598-023-40154-0] [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: 05/30/2023] [Accepted: 08/05/2023] [Indexed: 08/11/2023] Open
Abstract
A heterogeneous copper-catalyzed A3 coupling reaction of aldehydes, amines, and alkynes for the synthesis of propargylamines and benzofurans has been developed. Here, the modified metal-organic framework MIL-101(Cr)-SB-Cu complex was chosen as the heterogeneous copper catalyst and prepared via post-synthetic modification of amino-functionalized MIL-101(Cr). The structure, morphology, thermal stability, and copper content of the catalyst were determined by FT-IR, PXRD, SEM, TEM, EDX, TGA, XPS, and ICP-OES. The catalyst shows high catalytic activity for the aforementioned reactions under solvent-free reaction conditions. High yields, low catalyst loading, easy catalyst recovery and reusability with not much shrink in catalytic activity, and a good yield of 82% in gram-scale synthesis are some of the benefits of this protocol that drove it towards sustainability.
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Affiliation(s)
- Fillip Kumar Sarkar
- Department of Chemistry, Centre for Advanced Studies, North-Eastern Hill University, Shillong, Meghalaya, 793022, India
| | - Lenida Kyndiah
- Department of Chemistry, Centre for Advanced Studies, North-Eastern Hill University, Shillong, Meghalaya, 793022, India
| | - Sushmita Gajurel
- Department of Chemistry, Centre for Advanced Studies, North-Eastern Hill University, Shillong, Meghalaya, 793022, India
| | - Rajib Sarkar
- Department of Chemistry, Centre for Advanced Studies, North-Eastern Hill University, Shillong, Meghalaya, 793022, India
| | - Samaresh Jana
- Department of Chemistry, School of Applied Sciences, KIIT- Deemed to be University, Bhubaneswar, Odisha, 751024, India
| | - Amarta Kumar Pal
- Department of Chemistry, Centre for Advanced Studies, North-Eastern Hill University, Shillong, Meghalaya, 793022, India.
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7
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Bera D, Sarkar R, Saha P, Ghosh P, Mukhopadhyay C. Aqueous mediated iodine catalyzed C-N coupling followed by C-C coupling towards 5 H-pyrazino[2,3- b]indoles. Chem Commun (Camb) 2023. [PMID: 37264649 DOI: 10.1039/d3cc01631e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Our study describes a new development featuring iodine-catalyzed two consecutive oxidative cross-coupling reactions involving Cα(sp3)-H of benzyl amines followed by intramolecular cyclization in water under air. Here, C-N coupling followed by C-C coupling occurs in a green environment to provide a variety of 5H-pyrazino[2,3-b]indoles within a short time period.
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Affiliation(s)
- Debasish Bera
- Department of Chemistry, University of Calcutta, 92 APC Road, Kolkata-700009, India.
| | - Rajib Sarkar
- Department of Chemistry, University of Calcutta, 92 APC Road, Kolkata-700009, India.
| | - Pinaki Saha
- Department of Chemistry, Ramakrishna Mission Residential College (Autonomous), Narendrapur, Kolkata-700103, India
| | - Prasanta Ghosh
- Department of Chemistry, Ramakrishna Mission Residential College (Autonomous), Narendrapur, Kolkata-700103, India
| | - Chhanda Mukhopadhyay
- Department of Chemistry, University of Calcutta, 92 APC Road, Kolkata-700009, India.
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Hossain MS, Shahiduzzaman M, Rahim MA, Paul M, Sarkar R, Chaity FS, Uddin MN, Rana GM, Yeasmin MS, Kibria A, Islam S. Bioactive properties and organosulfur compounds profiling of newly developed garlic varieties of Bangladesh. Food Chem X 2023; 17:100577. [PMID: 36845496 PMCID: PMC9944507 DOI: 10.1016/j.fochx.2023.100577] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [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: 08/23/2022] [Revised: 01/09/2023] [Accepted: 01/11/2023] [Indexed: 01/15/2023] Open
Abstract
Studies are being carried out on achieving the maximum quality of garlic through various approaches. In Bangladesh, new garlic varieties (BARI 1-4, BAU-1, BAU-2, BAU-5) have been recently developed by artificial selection to enhance their quality. The present study aimed to evaluate their potency in terms of bioactive properties and organosulfur compounds content using different bioassay and GC-MS techniques while comparing them with other accessible varieties (Chinese, Indian, Local). The new variety, BARI-3 showed the highest antioxidant activity and total phenolic content. It was also found with the highest level of a potent blood pressure-lowering agent, 2-vinyl-4H-1,3-dithiine (78.15 %), which is never reported in any garlic at this percentage. However, the local variety exhibited greater inhibitory properties against the tested organisms including multidrug-resistant pathogens compared to other varieties. This study primarily shows the potential of these two kinds of garlic for their further utilization and development.
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Affiliation(s)
- Md. Saddam Hossain
- Industrial Microbiology Research Division, BCSIR Chattogram Laboratories, Bangladesh Council of Scientific & Industrial Research (BCSIR), Chattogram 4220, Bangladesh
| | - Md. Shahiduzzaman
- Regional Spices Research Centre, Bangladesh Agriculture Research Institute, Gazipur 1701, Bangladesh
| | - Mohammad Abdur Rahim
- Department of Horticulture, Bangladesh Agriculture University, Mymensingh 2202, Bangladesh
| | - Methun Paul
- Department of Microbiology, Noakhali Science & Technology University, Noakhali 3814, Bangladesh
| | - Rajib Sarkar
- Industrial Microbiology Research Division, BCSIR Chattogram Laboratories, Bangladesh Council of Scientific & Industrial Research (BCSIR), Chattogram 4220, Bangladesh
| | - Farjana Showline Chaity
- Industrial Microbiology Research Division, BCSIR Chattogram Laboratories, Bangladesh Council of Scientific & Industrial Research (BCSIR), Chattogram 4220, Bangladesh
| | - Md. Najem Uddin
- Pharmaceutical Sciences Research Division, BCSIR Dhaka Laboratories, Bangladesh Council of Scientific & Industrial Research (BCSIR), Dhaka, Dhaka 1205, Bangladesh
| | - G.M. Masud Rana
- Oils, Fats & Waxes Research Division, BCSIR Rajshahi Laboratories, Bangladesh Council of Scientific & Industrial Research (BCSIR), Rajshahi 6206, Bangladesh
| | - Mst. Sarmina Yeasmin
- Oils, Fats & Waxes Research Division, BCSIR Rajshahi Laboratories, Bangladesh Council of Scientific & Industrial Research (BCSIR), Rajshahi 6206, Bangladesh
| | - Amena Kibria
- Aromatic and Medicinal Plant Research Division, BCSIR Chattogram Laboratories, Bangladesh Council of Scientific & Industrial Research (BCSIR), Chattogram 4220, Bangladesh
| | - Saiful Islam
- Industrial Microbiology Research Division, BCSIR Chattogram Laboratories, Bangladesh Council of Scientific & Industrial Research (BCSIR), Chattogram 4220, Bangladesh
- Corresponding author.
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9
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Gajurel S, Sarkar FK, Sarkar R, Kyndiah L, Pal AK. Cu incorporated polymeric heterogeneous catalyst: Exploring an expedient approach to construct amide bonds and extending its application to triazole hybrid amides synthesis. NEW J CHEM 2023. [DOI: 10.1039/d2nj04090e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/29/2023]
Abstract
A self-assembly of copper-grafted imidazole polymeric complex is synthesized via a coordinative-convolution method. The structural characterization of the polymeric copper catalyst was completed through FT-IR, SEM, TEM-EDX, SAED, PXRD, TGA,...
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10
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Chakraborty D, Arefin P, Bhattacharjee SC, Hasan M, Sarkar R, Das S, Rahman S, Habib MS, Islam S, Jahan F, Ray G, Ferdous J, Farhana F, Islam MA, Mostafa M. Biological activity of Mesua ferrea (Nageswar) seed extracts: An in vitro and in silico study. Informatics in Medicine Unlocked 2023. [DOI: 10.1016/j.imu.2023.101166] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023] Open
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11
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Gajurel S, Sarkar R, Sarkar FK, Kyndiah L, Pal AK. Versatile and Sustainable Approach to Access Biologically Relevant Chromeno[2,3- b]pyridine and Benzylpyrazolyl Coumarin Derivatives Using Graphitic Carbon Nitride as a Reusable Heterogeneous Catalyst. ACS Omega 2022; 7:48087-48099. [PMID: 36591201 PMCID: PMC9798746 DOI: 10.1021/acsomega.2c06070] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/20/2022] [Accepted: 11/30/2022] [Indexed: 06/17/2023]
Abstract
Herein, the synthesis of graphitic carbon nitride (g-C3N4) via the simple heating of cheap and readily available urea as the starting material has been reported. The catalytic activity of the prepared g-C3N4 was investigated for the synthesis of chromeno[2,3-b]pyridine and benzylpyrazolyl coumarin derivatives in an ethanol medium. The reactions were performed under mild conditions to achieve widely functionalized target products in a one-pot operation. The as-synthesized g-C3N4, being a heterogeneous catalyst, demonstrates excellent recyclability up to the 5th consecutive run without a significant decrease in its catalytic activity and yield of the product. A gram-scale reaction was performed to demonstrate the industrial applications of the present protocol. The green chemistry metrics such as environmental factor (E-factor), atom economy (AE), carbon efficiency (CE), and reaction mass efficiency (RME) were calculated and found to be very close to the ideal values. Additionally, operation simplicity, wide substrate scope, easy reusability of the catalyst, and avoidance of metal contamination in the products drive the process toward green and sustainable development.
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12
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Vasilchikova T, Vavilova E, Salikhov T, Nalbandyan V, Dengre S, Sarkar R, Klauss HH, Vasiliev A. Static and Resonant Properties and Magnetic Phase Diagram of LiMn 2TeO 6. Materials (Basel) 2022; 15:8694. [PMID: 36500188 PMCID: PMC9735636 DOI: 10.3390/ma15238694] [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: 10/21/2022] [Revised: 11/28/2022] [Accepted: 12/02/2022] [Indexed: 06/17/2023]
Abstract
Physical properties of the mixed-valent tellurate of lithium and manganese, LiMn2TeO6, were investigated in measurements of ac and dc magnetic susceptibility χ, magnetization M, specific heat Cp, electron spin resonance (ESR), and nuclear magnetic resonance (NMR) in the temperature range 2−300 K under magnetic field up to 9 T. The title compound orders magnetically in two steps at T1 = 20 K and T2 = 13 K. The intermediate phase at T2 < T < T1 is fully suppressed by magnetic field µ0H of about 4 T. Besides magnetic phases transitions firmly established in static measurements, relaxation-type phenomena were observed well above magnetic ordering temperature in resonant measurements.
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Affiliation(s)
- Tatyana Vasilchikova
- Low Temperature Physics and Superconductivity Department, Lomonosov Moscow State University, 119991 Moscow, Russia
- Functional Quantum Materials Laboratory, National University of Science and Technology “MISiS”, 119049 Moscow, Russia
| | - Evgeniya Vavilova
- Zavoisky Physical-Technical Institute, FRC Kazan Scientific Center of RAS, 420029 Kazan, Russia
| | - Timur Salikhov
- Zavoisky Physical-Technical Institute, FRC Kazan Scientific Center of RAS, 420029 Kazan, Russia
| | - Vladimir Nalbandyan
- Faculty of Chemistry, Southern Federal University, 344090 Rostov-on-Don, Russia
| | - Shanu Dengre
- Institute for Solid State and Material Physics, Technische Universität Dresden, 01069 Dresden, Germany
| | - Rajib Sarkar
- Institute for Solid State and Material Physics, Technische Universität Dresden, 01069 Dresden, Germany
| | - Hans-Henning Klauss
- Institute for Solid State and Material Physics, Technische Universität Dresden, 01069 Dresden, Germany
| | - Alexander Vasiliev
- Low Temperature Physics and Superconductivity Department, Lomonosov Moscow State University, 119991 Moscow, Russia
- Functional Quantum Materials Laboratory, National University of Science and Technology “MISiS”, 119049 Moscow, Russia
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13
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Alam K, Mazumder A, Sikdar S, Zhao YM, Hao J, Song C, Wang Y, Sarkar R, Islam S, Zhang Y, Li A. Streptomyces: The biofactory of secondary metabolites. Front Microbiol 2022; 13:968053. [PMID: 36246257 PMCID: PMC9558229 DOI: 10.3389/fmicb.2022.968053] [Citation(s) in RCA: 41] [Impact Index Per Article: 20.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2022] [Accepted: 08/15/2022] [Indexed: 11/13/2022] Open
Abstract
Natural products derived from microorganisms serve as a vital resource of valuable pharmaceuticals and therapeutic agents. Streptomyces is the most ubiquitous bacterial genus in the environments with prolific capability to produce diverse and valuable natural products with significant biological activities in medicine, environments, food industries, and agronomy sectors. However, many natural products remain unexplored among Streptomyces. It is exigent to develop novel antibiotics, agrochemicals, anticancer medicines, etc., due to the fast growth in resistance to antibiotics, cancer chemotherapeutics, and pesticides. This review article focused the natural products secreted by Streptomyces and their function and importance in curing diseases and agriculture. Moreover, it discussed genomic-driven drug discovery strategies and also gave a future perspective for drug development from the Streptomyces.
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Affiliation(s)
- Khorshed Alam
- Helmholtz International Lab for Anti-Infectives, Shandong University-Helmholtz Institute of Biotechnology, State Key Laboratory of Microbial Technology, Shandong University, Qingdao, China
| | - Arpita Mazumder
- Department of Microbiology, University of Chittagong, Chittagong, Bangladesh
| | - Suranjana Sikdar
- Department of Microbiology, University of Chittagong, Chittagong, Bangladesh
| | - Yi-Ming Zhao
- Helmholtz International Lab for Anti-Infectives, Shandong University-Helmholtz Institute of Biotechnology, State Key Laboratory of Microbial Technology, Shandong University, Qingdao, China
| | - Jinfang Hao
- Helmholtz International Lab for Anti-Infectives, Shandong University-Helmholtz Institute of Biotechnology, State Key Laboratory of Microbial Technology, Shandong University, Qingdao, China
| | - Chaoyi Song
- Helmholtz International Lab for Anti-Infectives, Shandong University-Helmholtz Institute of Biotechnology, State Key Laboratory of Microbial Technology, Shandong University, Qingdao, China
| | - Yanyan Wang
- Helmholtz International Lab for Anti-Infectives, Shandong University-Helmholtz Institute of Biotechnology, State Key Laboratory of Microbial Technology, Shandong University, Qingdao, China
| | - Rajib Sarkar
- Industrial Microbiology Research Division, BCSIR Chattogram Laboratories, Bangladesh Council of Scientific and Industrial Research (BCSIR), Chattogram, Bangladesh
| | - Saiful Islam
- Industrial Microbiology Research Division, BCSIR Chattogram Laboratories, Bangladesh Council of Scientific and Industrial Research (BCSIR), Chattogram, Bangladesh
- Saiful Islam,
| | - Youming Zhang
- Helmholtz International Lab for Anti-Infectives, Shandong University-Helmholtz Institute of Biotechnology, State Key Laboratory of Microbial Technology, Shandong University, Qingdao, China
- Chinese Academy of Sciences (CAS) Key Laboratory of Quantitative Engineering Biology, Shenzhen Institute of Synthetic Biology, Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, Shenzhen, China
- Youming Zhang,
| | - Aiying Li
- Helmholtz International Lab for Anti-Infectives, Shandong University-Helmholtz Institute of Biotechnology, State Key Laboratory of Microbial Technology, Shandong University, Qingdao, China
- *Correspondence: Aiying Li,
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Nandi S, Jamatia R, Sarkar R, Sarkar FK, Alam S, Pal AK. One‐Pot Multicomponent Reaction: A Highly Versatile Strategy for the Construction of Valuable Nitrogen‐Containing Heterocycles. ChemistrySelect 2022. [DOI: 10.1002/slct.202201901] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Sibaji Nandi
- Department of Chemistry North-Eastern Hill University Shillong Meghalaya 793022 India
| | - Ramen Jamatia
- Department of Chemistry Rajiv Gandhi University, Rono Hills, Doimukh Arunachal Pradesh 791112 India
| | - Rajib Sarkar
- Department of Chemistry North-Eastern Hill University Shillong Meghalaya 793022 India
| | - Fillip Kumar Sarkar
- Department of Chemistry North-Eastern Hill University Shillong Meghalaya 793022 India
| | - Safiul Alam
- Department of Chemistry Aliah University, IIA/27, New Town Kolkata 700160 India
| | - Amarta Kumar Pal
- Department of Chemistry North-Eastern Hill University Shillong Meghalaya 793022 India
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Khatri VN, Nainegali L, Sarkar R, Das SK. Assessment of Overburden Dump and Highwall Slope Stability for Jambad Open Cast Coal Mine, West Bengal, India, using in Situ and Laboratory Testing. CURR SCI INDIA 2022. [DOI: 10.18520/cs/v123/i2/184-193] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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16
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Sarkar R, Gajurel S, Gupta A, Kumar Pal A. Synergistic Catalysis by Copper Oxide/Graphene Oxide Nanocomposites: A Facile Approach to Prepare Quinazolines and Quinazoline Containing Triazole/Tetrazole Moieties under Mild Reaction Conditions. ChemistrySelect 2022. [DOI: 10.1002/slct.202200297] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Rajib Sarkar
- Department of Chemistry, Centre for Advanced Studies North-Eastern Hill University Shillong 793022 India
| | - Sushmita Gajurel
- Department of Chemistry, Centre for Advanced Studies North-Eastern Hill University Shillong 793022 India
| | - Ajay Gupta
- Department of Chemistry, Centre for Advanced Studies North-Eastern Hill University Shillong 793022 India
| | - Amarta Kumar Pal
- Department of Chemistry, Centre for Advanced Studies North-Eastern Hill University Shillong 793022 India
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Zeiser R, Russo D, Ram R, Hashmi S, Chakraverty R, Moritz Middeke J, Giebel S, Sarkar R, Gowda M, Gunes S, Stefanelli T, Lee SJ, Teshima T, Locatelli F. P1389: RUXOLITINIB DEMONSTRATES A GREATER CORTICOSTEROID-SPARING EFFECT THAN BEST AVAILABLE THERAPY IN PATIENTS WITH CORTICOSTEROID-REFRACTORY/DEPENDENT CHRONIC GRAFT-VS-HOST DISEASE. Hemasphere 2022. [PMCID: PMC9429566 DOI: 10.1097/01.hs9.0000848416.66197.62] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/02/2022] Open
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18
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Sarkar R, Roychoudhury P, Kumar S, Dutta S, Konwar N, Subudhi PK, Dutta TK. Rapid detection of Actinobacillus pleuropneumoniae targeting the apxIVA gene for diagnosis of contagious porcine pleuropneumonia in pigs by Polymerase Spiral Reaction. Lett Appl Microbiol 2022; 75:442-449. [PMID: 35616177 DOI: 10.1111/lam.13749] [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: 03/20/2022] [Revised: 05/13/2022] [Accepted: 05/16/2022] [Indexed: 11/29/2022]
Abstract
Actinobacillus pleuropneumoniae is the primary etiological agent of contagious porcine pleuropneumonia associated with serious economic impact on pig husbandry worldwide. Diagnosis of the disease by existing techniques including isolation and identification bacteria followed by serotyping, serological techniques, conventional PCR, real-time PCR and LAMP assays are cumbersome, time consuming, costly and not suitable for rapid field application. A novel isothermal polymerase chain reaction (PSR) technique is standardized for all the reagents, incubation time and incubation temperature against A. pleuropneumoniae. Sensitivity of the assay was determined against various dilutions of purified DNA and total bacterial count. Specificity of the assay was determined against 11 closely related bacterial isolates. The relative sensitivity and specificity was compared with bacterial isolation, conventional PCR and real-time PCR assays. The PSR assay for specific detection was standardized at 64o C for 30 minutes incubation in a water bath. The result was visible by the naked eye after centrifugation of the reaction mixture or after incorporation of SYBR Green dye as yellow-green fluorescence. The technique was found to be 100% specific and equally sensitive with real-time PCR and 10 times more sensitive than conventional PCR. The PSR assay could be applicable in detection of the organisms in porcine nasal swabs spiked with A. pleuropneumoniae. This is the first ever report on development of PSR for specific detection of A. pleuropneumoniae and can be applied for early diagnosis at field level.
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Affiliation(s)
- R Sarkar
- Department of Veterinary Microbiology, Central Agricultural University, Selesih, Aizawl, Mizoram-796 014, India
| | - P Roychoudhury
- Department of Veterinary Microbiology, Central Agricultural University, Selesih, Aizawl, Mizoram-796 014, India
| | - S Kumar
- Department of Veterinary Microbiology, Central Agricultural University, Selesih, Aizawl, Mizoram-796 014, India
| | - S Dutta
- Department of Veterinary Microbiology, Central Agricultural University, Selesih, Aizawl, Mizoram-796 014, India
| | - N Konwar
- Department of Veterinary Microbiology, Central Agricultural University, Selesih, Aizawl, Mizoram-796 014, India
| | - P K Subudhi
- Department of Veterinary Microbiology, Central Agricultural University, Selesih, Aizawl, Mizoram-796 014, India
| | - T K Dutta
- Department of Veterinary Microbiology, Central Agricultural University, Selesih, Aizawl, Mizoram-796 014, India
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Anand A, Sarkar R. Bearing capacity of spatially variable unsaturated fly ash deposit using random field theory. CURR SCI INDIA 2022. [DOI: 10.18520/cs/v122/i5/542-556] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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20
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Nathues A, Hoffmann M, Schmedemann N, Sarkar R, Thangjam G, Mengel K, Hernandez J, Hiesinger H, Pasckert JH. Brine residues and organics in the Urvara basin on Ceres. Nat Commun 2022; 13:927. [PMID: 35194036 PMCID: PMC8863799 DOI: 10.1038/s41467-022-28570-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2021] [Accepted: 01/24/2022] [Indexed: 11/09/2022] Open
Abstract
Ceres is a partially differentiated dwarf planet, as confirmed by NASA's Dawn mission. The Urvara basin (diameter ~170 km) is its third-largest impact feature, enabling insights into the cerean crust. Urvara's geology and mineralogy suggest a potential brine layer at the crust-mantle transition. Here we report new findings that help in understanding the structure and composition of the cerean crust. These results were derived by using the highest-resolution Framing Camera images acquired by Dawn at Ceres. Unexpectedly, we found meter-scale concentrated exposures of bright material (salts) along the crater's upper central ridge, which originate from an enormous depth, possibly from a deep-seated brine or salt reservoir. An extended resurfacing modified the southern floor ~100 Myr after crater formation (~250 Myr), long after the dissipation of the impact-generated heat. In this resurfaced area, one floor scarp shows a granular flow pattern of bright material, showing spectra consistent with the presence of organic material, the first such finding on Ceres beyond the vast Ernutet area. Our results strengthen the hypothesis that Ceres is and has been a geologically active world even in recent epochs, with salts and organic-rich material playing a major role in its evolution.
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Affiliation(s)
- A Nathues
- Max Planck Institute for Solar System Research, Justus-von-Liebig-Weg 3, 37077, Goettingen, Germany.
| | - M Hoffmann
- Max Planck Institute for Solar System Research, Justus-von-Liebig-Weg 3, 37077, Goettingen, Germany
| | - N Schmedemann
- Institut für Planetologie, WWU Münster, Münster, Germany
| | - R Sarkar
- Max Planck Institute for Solar System Research, Justus-von-Liebig-Weg 3, 37077, Goettingen, Germany
| | - G Thangjam
- School of Earth and Planetary Sciences, National Institute of Science Education and Research, NISER, HBNI, Bhubaneswar, India
| | - K Mengel
- Max Planck Institute for Solar System Research, Justus-von-Liebig-Weg 3, 37077, Goettingen, Germany
| | - J Hernandez
- Max Planck Institute for Solar System Research, Justus-von-Liebig-Weg 3, 37077, Goettingen, Germany
| | - H Hiesinger
- Institut für Planetologie, WWU Münster, Münster, Germany
| | - J H Pasckert
- Institut für Planetologie, WWU Münster, Münster, Germany
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21
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Sarkar FK, Gajurel S, Kyndiah L, Sarkar R, Devan RS, Pal AK. Palladium incorporated MIL-101(Cr): A heterogeneous and reusable catalyst for C-H functionalization of unactivated arenes. NEW J CHEM 2022. [DOI: 10.1039/d2nj03889g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Herein, palladium containing metal-organic framework was designed for utilizing in C-H functionalization of unactivated arenes. The catalyst was prepared via post-synthetic modification of amino-functionalized MIL-101(Cr) and was well characterized using...
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22
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Basu K, Sarkar S, Karmakar S, Das D, Das C, Sarkar R. Role of cytokines in Granulomatous Colitis. Bangladesh J Med Sci 2021. [DOI: 10.3329/bjms.v20i4.54135] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
Abstract
Background: Intestinal tuberculosis (ITB) have significant immunological similarity with Crohn’s disease (CD). T helper cells and various cytokines secreted by them play a very crucial role in the pathogenesis of both the diseases. It is of great clinical relevance in a country like India to perform a comparative study between CD and ITB with respect to pathogenesis.
Objectives: To study the levels of four cytokines(IL-4,IL-17, IFN-ϒ & TGF-β1 ) s in serum of patients with CD & ITB which indirectly reflects the levels of CD4+ T cells.
Material and method: An observational, cross-sectional study was done on patients, attending Gastroenterolory clinic in a tertiary care hospital, with features of ileitis, colitis or ileo-colitis due to CD or ITB.12 cases of Crohn’s disease & 13 cases of intestinal tuberculosis were taken( control-20 cases). 5 biopsies were taken from the ulcerated mucosa & 3 biopsies were taken from normal mucosa. H & E study & serum levels of four cytokines(IL-4,IL-17, IFN-ϒ & TGF-β1 ) were estimated.
Results & analysis: In CD & ITB we found marginal increase of IFN-ϒ & TGF-β1 compared to control. IL17 level was found decreased in ITB compared to control (p=0.001).CD4+ T cells study by ELISA also showed significant increase in the concentration of IFN-γ (p=0.007) in ITB. There was no change in IL4 levels.
Conclusion: Cytokines have an important role in the pathogenesis of grannulomatuos inflammatory bowel diseases. The identification of cytokines & their role in the pathogenesis might be helpful for future therapy based on cytokines, and anti-cytokine antibodies.
Bangladesh Journal of Medical Science Vol.20(4) 2021 p.784-789
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Ma Q, Zhang J, Lu B, Lin H, Sarkar R, Wu T, Li X. Nanoemulgel for Improved Topical Delivery of Desonide: Formulation Design and Characterization. AAPS PharmSciTech 2021; 22:163. [PMID: 34031790 DOI: 10.1208/s12249-021-02035-5] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2020] [Accepted: 04/27/2021] [Indexed: 02/01/2023] Open
Abstract
This research aimed to develop a novel drug delivery system to improve treatment of skin disorders. The system is comprised of a Carbopol 980-based nanoemulgel (NE-gel) containing a desonide (DES; 0.05%, w/w) nanoemulsion (NE), which has a small particle size, high encapsulation efficiency, good thermodynamic stability, good permeation ability, and high skin retention. DES-loaded NE (DES-NE) was prepared by high-pressure homogenization. The developed formulation was characterized by differential scanning calorimetry (DSC), X-ray diffraction, drug release, skin permeation, and drug retention. DES in vitro release and skin permeation studies with different formulations of artificial membrane and rat abdominal skin were performed with the Franz diffusion cell system. Confocal laser scanning microscopy (CLSM) was used to detect the localization and permeation pathways of drugs in the skin. Compared with commercially available gel (CA-gel) and NE, the NE-gel release process conformed to the Higuchi release model (R2 = 0.9813). NE-gel prolonged the drug release time and allowed for reduced administration dose and frequency. The unit cumulative permeation of NE and NE-gel through the skin for 12 h was 63.13 ± 2.78 and 42.53 ± 2.06 μg/cm2, respectively, values significantly higher (p < 0.01) than that of the CA-gel (30.65 ± 1.25 μg/cm2) and CA-cream (15.21 ± 0.97 μg/cm2). The DES-NE and DES NE-gel skin drug retention was significantly higher than commercially available formulations (p < 0.01). Hence, the prepared NE-gel is a potential vehicle for improved topical DES delivery for better treatment of skin disorders.
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Das S, Sarkar R. Monitoring and evaluating the spatiotemporal variations of the water quality of a stretch of the Bhagirathi-Hugli River, West Bengal, India, using geospatial technology and integrated statistical methods. Environ Sci Pollut Res Int 2021; 28:15853-15869. [PMID: 33244692 DOI: 10.1007/s11356-020-11655-6] [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] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/07/2020] [Accepted: 11/12/2020] [Indexed: 06/11/2023]
Abstract
Water quality is a critical environmental issue because all forms of life depend on the water. The present study primarily focused on the spatiotemporal trends of water quality in a section of the Bhagirathi-Hugli River, West Bengal, using geospatial technology and integrated statistical methods. For this purpose, 83 samples of 7 water parameters were analysed and compared them with Indian Standards (IS 2004), Environmental Protection Agency (EPA 2001) and World Health Organization (WHO 1993) for the protection of aquatic life and human consumption. Correlation, box and whisker plots, paired sample t test, water quality index (WQI), cluster analysis (CA) and principal component analysis (PCA) were applied as an integrated multivariate statistical approach to understanding the nature of water quality. Pollution sources were identified by PCA indicating different origins both naturally and anthropogenic sources. The box and whisker plots displayed the significantly spatiotemporal variations and concentration of the variables. The paired sample t test identified that the surface water quality varied significantly between the seasons with significant value p < 0.05. Cluster analysis grouped 83 monitoring sites into 4 clusters to identify the pollution status such as low, moderate, high and very high pollution sites. Principal component analysis confirmed that the first three PCs with eigenvalues are higher than 1 contributing 90.83% of total variability for various parameters. The conductivity, total dissolved solids (TDS), salt and pH were expressively influenced by the anthropogenic effect while the temperature, oxidation-reduction potential (ORP) and dissolved oxygen (DO) were affected by seasonal factors. Results of WQI ranged from 45.04 to 83.79, and an average value was 69.55 with 69% samples representing poor water quality for drinking and domestic purposes. It also indicates that the water quality of rural sites was better than industrial and urban sites in both seasons and also shows that it was better for the duration of the post-monsoon than pre-monsoon.
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Affiliation(s)
- Sanat Das
- Department of Geography, Adamas University, Kolkata, West Bengal, 700126, India.
| | - Rajib Sarkar
- Department of Geography, Adamas University, Kolkata, West Bengal, 700126, India
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Abstract
The use of small organic molecules as organocatalysts in organic synthesis has been intensely
studied over the past decade. In this emerging field, considerable studies have led to the introduction
of various efficient organocatalyzed synthetic methods of carbon-carbon and carbon-
heteroatom bond formations. The use of these organocatalysts also showed environmentally benign
reaction conditions compared to the metal-catalyzed transformations. In this review, we paid
special attention to the most recent organocatalytic protocols reported for the synthesis of heterocycles.
The studies have been outlined, depending on the organocatalysts used as: (i) nitrogen-based
molecules as organocatalyst, (ii) NHCs as organocatalyst, and (iii) phosphorus-based molecules as
organocatalysts. The discussion intends to reveal the scope as well as the vitality of organocatalysis
in the area of heterocycle synthesis.
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Affiliation(s)
- Rajib Sarkar
- Department of Chemistry, University of Calcutta, 92 APC Road, Kolkata-700009, India
| | - Chhanda Mukhopadhyay
- Department of Chemistry, University of Calcutta, 92 APC Road, Kolkata-700009, India
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Kalita A, Talukdar M, Sarma K, Kalita PC, Barman NN, Roychoudhury P, Kalita G, Choudhary OP, Doley PJ, Debroy S, Keneisenuo K, Sarkar R. Lymphocyte subsets in the small intestine of piglets fed with probiotic and zinc: a qualitative and quantitative micro-anatomical study. Folia Morphol (Warsz) 2021; 81:82-90. [PMID: 33438190 DOI: 10.5603/fm.a2020.0148] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2020] [Revised: 12/06/2020] [Accepted: 12/07/2020] [Indexed: 11/25/2022]
Abstract
BACKGROUND Piglet mortality is a real concern to the pig farmers. The major cause is due to the late maturation of the immune system and dietary changes in post-weaned piglets. The potential role of probiotic and zinc in the stimulation of the immune system is well established. Hence, the present study was undertaken to evaluate alterations of T and B cells in the small intestine after dietary inclusion of probiotic and zinc in pre and post-weaned piglets. MATERIALS AND METHODS A total of 18 healthy LWY piglets, irrespective of sex obtained from 3 litters at the age-group of 20, 30 and 60 days. They were divided into a control group fed with basal diet and a treatment group fed with probiotic and zinc supplement along with the basal diet, consisting of three animals in each group. The piglets were weaned at 28 days of age. After sacrificing the animals at day 20, 30 and 60 from both the groups, the abdominal cavity was opened and small intestinal tissue samples were collected, processed and stained by indirect immunofluorescence technique. The slides were evaluated under the fluorescent light microscope. The data were statistically analyzed. RESULTS The different T and B cell subsets were recorded in the lining epithelium, core of villus, crypt area of LP and PP area. The number of CD4+, CD8+, IgA+ and IgM+ cells was higher in the treated piglets than the control group of animals, irrespective of segments of intestine and age-group. CONCLUSIONS It can be concluded that the dietary supplementation of probiotic and zinc was found to be good additives as they can stimulate the immune response in piglets, especially during the critical early post-weaning period.
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Affiliation(s)
- A Kalita
- Departemtn of Veterinary Anatomy and Histology, College of Veterinary Sciences and Animal Husbandry, Central Agricultural University (I), 796015 Selesih, Aizawl, Mizoram, India
| | - M Talukdar
- Department of Veterinary Anatomy and Histology, College of Veterinary Science, Assam Agricultural University, Khanapara, 781022 Guwahati, Assam, India
| | - K Sarma
- Department of Veterinary Anatomy and Histology, College of Veterinary Science, Assam Agricultural University, Khanapara, 781022 Guwahati, Assam, India
| | - P C Kalita
- Departemtn of Veterinary Anatomy and Histology, College of Veterinary Sciences and Animal Husbandry, Central Agricultural University (I), 796015 Selesih, Aizawl, Mizoram, India
| | - N N Barman
- Department of Veterinary Microbiology, College of Veterinary Science, Assam Agricultural University, Khanapara,, 781022 Guwahati, Assam, India
| | - P Roychoudhury
- Department of Veterinary Microbiology, College of Veterinary Sciences and Animal Husbandry, Central Agricultural University (I), 796015 Aizawl, Mizoram, India
| | - G Kalita
- Department of Livestock Production and Management, College of Veterinary Sciences and Animal Husbandry, Central Agricultural University (I), 796015 Aizawl, Mizoram, India
| | - O P Choudhary
- Departemtn of Veterinary Anatomy and Histology, College of Veterinary Sciences and Animal Husbandry, Central Agricultural University (I), 796015 Selesih, Aizawl, Mizoram, India.
| | - P J Doley
- Departemtn of Veterinary Anatomy and Histology, College of Veterinary Sciences and Animal Husbandry, Central Agricultural University (I), 796015 Selesih, Aizawl, Mizoram, India
| | - S Debroy
- Departemtn of Veterinary Anatomy and Histology, College of Veterinary Sciences and Animal Husbandry, Central Agricultural University (I), 796015 Selesih, Aizawl, Mizoram, India
| | - K Keneisenuo
- Departemtn of Veterinary Anatomy and Histology, College of Veterinary Sciences and Animal Husbandry, Central Agricultural University (I), 796015 Selesih, Aizawl, Mizoram, India
| | - R Sarkar
- Departemtn of Veterinary Anatomy and Histology, College of Veterinary Sciences and Animal Husbandry, Central Agricultural University (I), 796015 Selesih, Aizawl, Mizoram, India
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Gupta A, Sarkar FK, Sarkar R, Jamatia R, Lee CY, Gupta G, Pal AK. Development of a new catalytic and sustainable methodology for the synthesis of benzodiazepine triazole scaffold using magnetically separable CuFe
2
O
4
@MIL‐101(Cr) nano‐catalyst in aqueous medium. Appl Organomet Chem 2020. [DOI: 10.1002/aoc.5782] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Ajay Gupta
- Department of Chemistry, Centre for Advanced StudiesNorth‐Eastern Hill University Shillong 793022 India
| | - Fillip Kumar Sarkar
- Department of Chemistry, Centre for Advanced StudiesNorth‐Eastern Hill University Shillong 793022 India
| | - Rajib Sarkar
- Department of Chemistry, Centre for Advanced StudiesNorth‐Eastern Hill University Shillong 793022 India
| | - Ramen Jamatia
- Department of Chemistry, Centre for Advanced StudiesNorth‐Eastern Hill University Shillong 793022 India
| | - Chang Yeon Lee
- Department of Energy and Chemical Engineering/Innovation Centre for Chemical EngineeringIncheon National University 119 Academy‐ro, Yeonsu‐gu Incheon 22012 Republic of Korea
| | - Gajendra Gupta
- Department of Energy and Chemical Engineering/Innovation Centre for Chemical EngineeringIncheon National University 119 Academy‐ro, Yeonsu‐gu Incheon 22012 Republic of Korea
| | - Amarta Kumar Pal
- Department of Chemistry, Centre for Advanced StudiesNorth‐Eastern Hill University Shillong 793022 India
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Marsili F, Travaglini M, Stinco G, Manzoni R, Tiberio R, Prignano F, Mazzotta A, Cannavò SP, Cuccia A, Germino M, Bongiorno MR, Persechino S, Florio T, Pettinato M, Tabanelli M, Sarkar R, Aloisi E, Bartezaghi M, Orsenigo R. Effectiveness of cyclosporine A in patients with moderate to severe plaque psoriasis in a real-life clinical setting in Italy: the TRANSITION study. J DERMATOL TREAT 2020; 33:401-407. [PMID: 32349568 DOI: 10.1080/09546634.2020.1757017] [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: 10/24/2022]
Abstract
Background: Cyclosporine A (CsA) is one of the systemic therapeutic options for moderate-to-severe psoriasis, based on its efficacy and rapidity of action. The current study investigated the response to CsA in patients with moderate-to-severe plaque psoriasis.Materials and Methods: TRANSITION was an observational, cross-sectional, multicentre study which evaluated the proportion of partial- and suboptimal-responders among patients with moderate-to-severe plaque psoriasis treated with continuous CsA for ≥12 weeks. Patients demonstrating a Psoriasis Area and Severity Index (PASI) response of ≥90, ≥75 and <90, ≥50 and <75 and <50 were defined as responders, suboptimal-responders, partial-responders, and non-responders, respectively.Results: A total of 196 patients (mean age, 46.6 years; 62.8% males) from 14 sites in Italy were evaluated. At the study visit, the mean (SD) PASI score was 4.2(5.5) compared with 15.3(7.1) prior to the last CsA cycle. For response categories, 39.8%, 22.4%, 16.8%, and 20.9% of patients were responders, suboptimal-responders, partial-responders, and non-responders to CsA treatment. Overall, 28.6% of patients permanently discontinued treatment with CsA (lack of efficacy [10.2%], poor tolerability and voluntary discontinuation [3.6% each], and other [11.7%]).Conclusion: Patients were only partially satisfied with CsA treatment, reporting measurable impact on quality of life. Only 40% patients showed a satisfactory response to CsA.
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Affiliation(s)
- F Marsili
- Unit of Dermatology, Versilia Hospital, Lido di Camaiore, Lucca, Italy
| | - M Travaglini
- Centro per la cura della Psoriasi, Hospital "Di Summa-Perrino", Brindisi, Italy
| | - G Stinco
- Institute of Dermatology, Department of Medicine, University Hospital, Udine, Italy
| | - R Manzoni
- Division of Dermatology, Azienda Sanitaria Locale of Biella, Ponderano, Italy
| | - R Tiberio
- SCDU Dermatology, AOU Maggiore della Carità, Novara, Italy
| | - F Prignano
- Department of Health Science Dermatology Unit, University of Florence, Firenze, Italy
| | - A Mazzotta
- Dermatology Unit, San Camillo-Forlanini Hospital, Rome, Italy
| | - S P Cannavò
- Dermatology Unit, University Hospital Policlinico "G. Martino", Messina, Italy
| | - A Cuccia
- Unit of Dermatology, San Donato Hospital, Arezzo, Italy
| | - M Germino
- Department of Dermatology, Hospital Policlinico Città di Udine, Udine, Italy
| | - M R Bongiorno
- Dermatology Unit, University Hospital Policlinico "P. Giaccone", Palermo, Italy
| | - S Persechino
- Dermatology Unit, NESMOS Department, S. Andrea Hospital, University of Rome "Sapienza", Rome, Italy
| | - T Florio
- Dermatology Unit, Hospital Di Venere-Carbonara di Bari, Bari, Italy
| | - M Pettinato
- Dermatology Unit, University Hospital "Policlinico-Vittorio Emanuele", Catania, Italy
| | - M Tabanelli
- U.O.C. Dermatologia Ravenna AUSL Romagna, Ospedale Santa Maria delle Croci, Ravenna, Italy
| | - R Sarkar
- Novartis Pharma AG, Basel, Switzerland
| | - E Aloisi
- Novartis Farma SpA, Origgio, Italy
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Sarkar R, Gupta A, Jamatia R, Pal AK. Reduced graphene oxide supported copper oxide nanocomposites: An efficient heterogeneous and reusable catalyst for the synthesis of ynones, 1,3‐diynes and 1,5‐benzodiazepines in one‐pot under sustainable reaction conditions. Appl Organomet Chem 2020. [DOI: 10.1002/aoc.5646] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Rajib Sarkar
- Department of Chemistry, Centre for Advanced StudiesNorth‐Eastern Hill University Shillong 793022 India
| | - Ajay Gupta
- Department of Chemistry, Centre for Advanced StudiesNorth‐Eastern Hill University Shillong 793022 India
| | - Ramen Jamatia
- Department of Chemistry, Centre for Advanced StudiesNorth‐Eastern Hill University Shillong 793022 India
| | - Amarta Kumar Pal
- Department of Chemistry, Centre for Advanced StudiesNorth‐Eastern Hill University Shillong 793022 India
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Rajeswari JS, Sarkar R, Dutta SC, Singh JP, Saw R. Seismic Behaviour of RC Building with Raft Foundation in the Ganges Basin, India. CURR SCI INDIA 2020. [DOI: 10.18520/cs/v118/i5/759-770] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Ghosh S, Pramanik S, Biswas K, Bhattacharjee K, Sarkar R, Chowdhury S, Mukhopadhyay P. Levothyroxine Absorption Test to Differentiate Pseudomalabsorption from True Malabsorption. Eur Thyroid J 2020; 9:19-24. [PMID: 32071898 PMCID: PMC7024890 DOI: 10.1159/000504218] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [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: 08/29/2019] [Accepted: 10/18/2019] [Indexed: 12/31/2022] Open
Abstract
BACKGROUND The levothyroxine absorption test for evaluation of pseudomalabsorption in patients with primary hypothyroid is not standardised. An individual in whom a workup for malabsorption is warranted remains undefined. METHODS Twenty-five euthyroid, 25 newly diagnosed hypothyroid, 25 treated hypothyroid with normalised TSH, and 25 hypothyroid subjects with elevated TSH despite adequate dose of levothyroxine for more than 6 months, and 10 euthyroid subjects with true malabsorption were administered levothyroxine (10 μg/kg or maximum 600 μg) to study its absorption profile by measuring free T4 level at hourly intervals for 5 h. Results : Free T4 peaked at 3 h with marginal insignificant decline at 4 h in all groups. The increments of free T4 (between baseline and 3 h) of the four groups (except malabsorption) were not statistically different. The mean increment of free T4 in true malabsorption was 0.39 ng/dL (95% CI: 0.29-0.52) and it was 0.78 ng/dL (95% CI: 0.73-0.85) (10.4 pmol/L) for other groups combined together. The cut off of free T4 increment at 3 h from baseline above 0.40 ng/dL had a sensitivity of 97% and specificity of 80% (AUC 0.904, p < 0.001) to exclude true malabsorption. CONCLUSION Subjects with elevated TSH on adequate dose of LT4 can be reliably diagnosed to be non-adherent to treatment with levothyroxine absorption test. The incremental value above 0.40 ng/dL (5.14 pmol/L) at 3 h may be useful to identify individuals where workup of malabsorption is unwarranted.
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Affiliation(s)
- Sujoy Ghosh
- Department of Endocrinology and Metabolism, I.P.G.M.E&R, Kolkata, India
| | - Subhodip Pramanik
- Department of Endocrinology and Metabolism, I.P.G.M.E&R, Kolkata, India
| | - Kaushik Biswas
- Department of Endocrinology and Metabolism, I.P.G.M.E&R, Kolkata, India
| | | | - Rajib Sarkar
- School of Digestive and Liver Diseases, Kolkata, India
| | | | - Pradip Mukhopadhyay
- Department of Endocrinology and Metabolism, I.P.G.M.E&R, Kolkata, India
- *Assoc. Prof. Pradip Mukhopadhyay, MD, DM, Department of Endocrinology and Metabolism, I.P.G.M.E&R, 244 AJC Bose Road, Kolkata 700020 (India), E-Mail
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Abstract
In the last few decades, considerable research has led to the introduction of selective and
efficient green as well as sustainable synthetic methods of functionalization of carbon-hydrogen bonds
to form new carbon-carbon and carbon-heteroatom bonds. In this emerging field, significant development
has been attained under various environmentally benign conditions including aqueous medium.
In this review, we have summarized the current development of C-H functionalization carried out in
an aqueous medium and its synthetic applications according to carbon-carbon and carbon-heteroatom
bond formations under green conditions.
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Affiliation(s)
- Rajib Sarkar
- Department of Chemistry, University of Calcutta, 92 APC Road, Kolkata-700009, India
| | - Chhanda Mukhopadhyay
- Department of Chemistry, University of Calcutta, 92 APC Road, Kolkata-700009, India
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Sultania S, Sarkar R, Das K, Dhali GK. Argon plasma coagulation is an effective treatment for chronic radiation proctitis in gynaecological malignancy: an observational study. Colorectal Dis 2019; 21:465-471. [PMID: 30585689 DOI: 10.1111/codi.14541] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [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: 06/02/2018] [Accepted: 11/12/2018] [Indexed: 12/31/2022]
Abstract
AIM Chronic radiation proctitis (CRP) develops in 5-15% of patients after pelvic radiation therapy, with rectal bleeding being the main symptom. Reports suggest that argon plasma coagulation (APC) can be an effective therapy for CRP following radiotherapy for prostate cancer, but there is less information about how useful it is after radiotherapy for gynaecological malignancy. The aim of this work therefore was to study the efficacy of APC for CRP after radiotherapy for gynaecological malignancy. METHOD This was a prospective study of consecutive patients with CRP following radiotherapy for gynaecological malignancy at IPGME&R, SDLD, Kolkata, India; symptoms included rectal bleeding grade (RBG) ≥ 2. APC was performed at monthly intervals to a maximum of four treatment sessions. Severity of disease at baseline was graded (endoscopically) by the total colonoscopic severity score (TCSS) and treatment response was assessed by reduction in RBG from ≥ 2 to ≤ 1 measured at > 6 months after cessation of APC. RESULTS Seventy patients [90% with cervical cancer, 10% with endometrial cancer; mean age 51.93 ± 9.15 years; median RBG 3 (range 2-4)] received APC. Seven patients died due to underlying malignancy and seven patients were lost to follow-up. Fifty-six (85.7%) patients responded to therapy after a median of 2 (range 1-4) treatment sessions. Multivariate analysis demonstrated that a lower haemoglobin at the start of treatment predicted failure of therapy (P < 0.05). CONCLUSION APC is an effective management option for CRP in female patients with gynaecological malignancy. However, the more anaemic the patient the less likely it is to be successful.
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Affiliation(s)
- S Sultania
- Department of Gastroenterology, CKS Hospitals, Jaipur, Rajasthan, India
| | - R Sarkar
- Department of Gastroenterology, School of Digestive and Liver disease, Kolkata, West Bengal, India
| | - K Das
- Department of Gastroenterology, School of Digestive and Liver disease, Kolkata, West Bengal, India
| | - G K Dhali
- Department of Gastroenterology, School of Digestive and Liver disease, Kolkata, West Bengal, India
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Sarkar R, Maji K, Haldar D. Correction: An efficient one pot ipso-nitration: structural transformation of a dipeptide by N-terminus modification. RSC Adv 2019; 9:21564-21565. [PMID: 35532427 PMCID: PMC9066153 DOI: 10.1039/c9ra90053e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2019] [Accepted: 06/27/2019] [Indexed: 11/25/2022] Open
Abstract
Correction for ‘An efficient one pot ipso-nitration: structural transformation of a dipeptide by N-terminus modification’ by Rajib Sarkar et al., RSC Adv., 2015, 5, 59570–59575.
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Affiliation(s)
- Rajib Sarkar
- Department of Chemical Sciences
- Indian Institute of Science Education and Research Kolkata
- Mohanpur
- India
| | - Krishnendu Maji
- Department of Chemical Sciences
- Indian Institute of Science Education and Research Kolkata
- Mohanpur
- India
| | - Debasish Haldar
- Department of Chemical Sciences
- Indian Institute of Science Education and Research Kolkata
- Mohanpur
- India
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Singsardar M, Mondal S, Sarkar R, Hajra A. (Diacetoxy)iodobenzene-Mediated Regioselective Imidation of Imidazoheterocycles with N-Fluorobenzenesulfonimide. ACS Omega 2018; 3:12505-12512. [PMID: 31457983 PMCID: PMC6645145 DOI: 10.1021/acsomega.8b02088] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/18/2018] [Accepted: 09/25/2018] [Indexed: 06/10/2023]
Abstract
Metal-free (diacetoxy)iodobenzene-mediated regioselective imidation of imidazoheterocycles using commercially available N-fluorobenzenesulfonimide as an imidating reagent has been developed. This protocol exhibits broad substrate scope with good to excellent yields of the imidated imidazopyridines under mild conditions in short reaction times. The present protocol also represents an efficient way to access the imidated derivatives of imidazo[2,1-b]thiazole, benzo[d]imidazo-[2,1-b]thiazole, indoles, and indolizines. A radical mechanistic pathway has been proposed for the present protocol.
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Singsardar M, Dey A, Sarkar R, Hajra A. Visible-Light-Induced Organophotoredox-Catalyzed Phosphonylation of 2H-Indazoles with Diphenylphosphine Oxide. J Org Chem 2018; 83:12694-12701. [DOI: 10.1021/acs.joc.8b02019] [Citation(s) in RCA: 69] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Mukta Singsardar
- Department of Chemistry, Visva-Bharati (A Central University), Santiniketan 731235, India
| | - Amrita Dey
- Department of Chemistry, Visva-Bharati (A Central University), Santiniketan 731235, India
| | - Rajib Sarkar
- Department of Chemistry, Visva-Bharati (A Central University), Santiniketan 731235, India
| | - Alakananda Hajra
- Department of Chemistry, Visva-Bharati (A Central University), Santiniketan 731235, India
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Shekhar C, Kumar N, Grinenko V, Singh S, Sarkar R, Luetkens H, Wu SC, Zhang Y, Komarek AC, Kampert E, Skourski Y, Wosnitza J, Schnelle W, McCollam A, Zeitler U, Kübler J, Yan B, Klauss HH, Parkin SSP, Felser C. Anomalous Hall effect in Weyl semimetal half-Heusler compounds RPtBi (R = Gd and Nd). Proc Natl Acad Sci U S A 2018; 115:9140-9144. [PMID: 30154165 PMCID: PMC6140499 DOI: 10.1073/pnas.1810842115] [Citation(s) in RCA: 84] [Impact Index Per Article: 14.0] [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: 11/18/2022] Open
Abstract
Topological materials ranging from topological insulators to Weyl and Dirac semimetals form one of the most exciting current fields in condensed-matter research. Many half-Heusler compounds, RPtBi (R = rare earth), have been theoretically predicted to be topological semimetals. Among various topological attributes envisaged in RPtBi, topological surface states, chiral anomaly, and planar Hall effect have been observed experimentally. Here, we report an unusual intrinsic anomalous Hall effect (AHE) in the antiferromagnetic Heusler Weyl semimetal compounds GdPtBi and NdPtBi that is observed over a wide temperature range. In particular, GdPtBi exhibits an anomalous Hall conductivity of up to 60 Ω-1⋅cm-1 and an anomalous Hall angle as large as 23%. Muon spin-resonance (μSR) studies of GdPtBi indicate a sharp antiferromagnetic transition (TN) at 9 K without any noticeable magnetic correlations above TN Our studies indicate that Weyl points in these half-Heuslers are induced by a magnetic field via exchange splitting of the electronic bands at or near the Fermi energy, which is the source of the chiral anomaly and the AHE.
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Affiliation(s)
- Chandra Shekhar
- Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany;
| | - Nitesh Kumar
- Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany
| | - V Grinenko
- Institute for Solid State and Materials Physics, Faculty of Physics, Technische Universität Dresden, 01069 Dresden, Germany
- Leibniz Institute for Solid State and Materials Research Dresden, 01069 Dresden, Germany
| | - Sanjay Singh
- Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany
| | - R Sarkar
- Institute for Solid State and Materials Physics, Faculty of Physics, Technische Universität Dresden, 01069 Dresden, Germany
| | - H Luetkens
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
| | - Shu-Chun Wu
- Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany
| | - Yang Zhang
- Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany
| | | | - Erik Kampert
- Dresden High Magnetic Field Laboratory (HLD-EMFL), Helmholtz-Zentrum Dresden-Rossendorf, 01328 Dresden, Germany
| | - Yurii Skourski
- Dresden High Magnetic Field Laboratory (HLD-EMFL), Helmholtz-Zentrum Dresden-Rossendorf, 01328 Dresden, Germany
| | - Jochen Wosnitza
- Institute for Solid State and Materials Physics, Faculty of Physics, Technische Universität Dresden, 01069 Dresden, Germany
- Dresden High Magnetic Field Laboratory (HLD-EMFL), Helmholtz-Zentrum Dresden-Rossendorf, 01328 Dresden, Germany
| | - Walter Schnelle
- Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany
| | - Alix McCollam
- High Field Magnet Laboratory (HFML-EMFL), Radboud University, 6525 ED Nijmegen, The Netherlands
| | - Uli Zeitler
- High Field Magnet Laboratory (HFML-EMFL), Radboud University, 6525 ED Nijmegen, The Netherlands
| | - Jürgen Kübler
- Institute for Solid State Physics, Technische Universität Darmstadt, 64289 Darmstadt, Germany
| | - Binghai Yan
- Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany
| | - H-H Klauss
- Institute for Solid State and Materials Physics, Faculty of Physics, Technische Universität Dresden, 01069 Dresden, Germany
| | - S S P Parkin
- Max Planck Institute of Microstructure Physics, 06120 Halle, Germany
| | - C Felser
- Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany
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39
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Sarkar R, Mdladla C, Macingwana L, Pietersen RD, Ngwane A, Tabb D, van Helden P, Wiid I, Baker B. Proteomic analysis reveals that sulfamethoxazole induces oxidative stress in M. tuberculosis. Tuberculosis (Edinb) 2018; 111:78-85. [DOI: 10.1016/j.tube.2018.05.010] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2018] [Revised: 03/27/2018] [Accepted: 05/15/2018] [Indexed: 02/04/2023]
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Saha A, Sarkar S, Mondal P, Sarkar R, Datta S. Recurrent Gastro-intestinal Bleeding Unfolded as Heyde's Syndrome. Indian J Pediatr 2018; 85:589-590. [PMID: 29313306 DOI: 10.1007/s12098-017-2587-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/13/2017] [Accepted: 12/18/2017] [Indexed: 10/18/2022]
Affiliation(s)
- Arpan Saha
- Department of Pediatric Medicine, Institute of Post-Graduate Medical Education and Research, Kolkata, India.
| | - Sumantra Sarkar
- Department of Pediatric Medicine, Institute of Post-Graduate Medical Education and Research, Kolkata, India
| | - Priyanker Mondal
- Department of Cardiology, Institute of Post-Graduate Medical Education and Research, Kolkata, India
| | - Rajib Sarkar
- Department of Gastro-enterology, School of Digestive and Liver Disease, Institute of Post-Graduate Medical Education and Research, Kolkata, India
| | - Supratim Datta
- Department of Pediatric Medicine, Institute of Post-Graduate Medical Education and Research, Kolkata, India
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41
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Rushel KZ, Hoque A, Alamgir MK, Islam MZ, Hasan KA, Rahman MR, Sarkar R, Hasan MK, Adhikary AB. Comparative Study between the Use of Multidose Standard Cardioplegia and Long Acting Del Nido Cardioplegia during Intracardiac Repair for Tetralogy of Fallot in Pediatric Patients. Mymensingh Med J 2018; 27:610-616. [PMID: 30141453] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Pediatric myocardium is unique from mature myocardium; thus, the use of adult cardioplegia for pediatric cardiac operations may provide suboptimal myocardial protection. It is found that children undergoing heart surgery show evidence of less myocardial damage when del Nido cardioplegia is used instead of a standard cardioplegic solution. Del Nido cardioplegia solution provides a depolarized hyperkalaemic arrest lasting up to 60 minutes, reduces spontaneous and inducible activity during arrest, and prevents hyper contraction during early reperfusion. In this single blind randomized trial, a total of 60 patients underwent intra cardiac repair for TOF in National Institute of Cardiovascular Diseases, Dhaka, Bangladesh from July 2014 to January 2016 fulfilling inclusion and exclusion criteria. They were randomly assigned in two groups- 30 patients in Del Nido group (Group A) and 30 patients in standard group (Group B). Comparison between groups was done by Chi square test and Student's test. All data were analyzed by SPSS 20.0 for windows. P value less than 0.05 was considered as significant. There was statistically significant difference among the patients in terms of mean total initial cardioplegia volume, mean number of additional dose, mean additional dose amount, mean cross clamp time, mean CPB time (331.67±188.07 vs. 458.67±226.62, p=0.022; 0.13±0.35 vs. 1.27±0.89, p=0.000; 23.33±60.76 vs. 336.83±259.6, p=0.000; 45.10±10.35 vs. 59.23±23.21, p=0.003; 89.30±15.73 vs. 111.10±29.23, p=0.001 respectively). Mean post operative serum troponin I level at arrival in ICU and after 24 hours between two groups were statistically significantly different (55.60±32.91 vs. 83.5±58.99; p=0.024 and 13.01±5.84 vs. 18.16±9.51; p=0.014 respectively). The mean ventilation duration, mean ICU stay were also statistically significant. This study showed that cardiac arrest with Del Nido cardioplegia during intra cardiac repair for TOF was associated with improved myocardial protection over standard cardioplegia in terms of reduced CPB and cross clamp times, lower total volume of cardioplegia.
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Affiliation(s)
- K Z Rushel
- Dr Khondokar Shamim Shahriar Ziban Rushel, Registrar, Department of Cardiac Surgery, National Institute of Cardiovascular Diseases (NICVD), Sher-e-Bangla Nagar, Dhaka, Bangladesh
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Dey A, Singsardar M, Sarkar R, Hajra A. Environment-Friendly Protocol for the Chlorination of Imidazoheterocycles by Chloramine-T. ACS Omega 2018; 3:3513-3521. [PMID: 31458602 PMCID: PMC6641228 DOI: 10.1021/acsomega.7b01844] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/23/2017] [Accepted: 03/15/2018] [Indexed: 05/27/2023]
Abstract
An environment-friendly method for the chlorination of imidazoheterocycles has been developed using chloramine-T, a novel chlorinating reagent. A bunch of C-3 chloro-substituted imidazo[1,2-a]pyridines with variety of functionalities have been synthesized in good yields under neat condition at room temperature within very short time. This chlorination process is also applicable to imidazo[2,1-b]thiazole scaffolds. The present methodology is relevant to gram-scale synthesis. The major advantages of this system such as wide applicability, easy availability of reactants, open-air and metal- and solvent-free reaction conditions, no need of work-up, and simple purification technique represent a green synthetic protocol.
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Kissikov T, Sarkar R, Lawson M, Bush BT, Timmons EI, Tanatar MA, Prozorov R, Bud'ko SL, Canfield PC, Fernandes RM, Curro NJ. Uniaxial strain control of spin-polarization in multicomponent nematic order of BaFe 2As 2. Nat Commun 2018. [PMID: 29535323 PMCID: PMC5849640 DOI: 10.1038/s41467-018-03377-8] [Citation(s) in RCA: 34] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
The iron-based high temperature superconductors exhibit a rich phase diagram reflecting a complex interplay between spin, lattice, and orbital degrees of freedom. The nematic state observed in these compounds epitomizes this complexity, by entangling a real-space anisotropy in the spin fluctuation spectrum with ferro-orbital order and an orthorhombic lattice distortion. A subtle and less-explored facet of the interplay between these degrees of freedom arises from the sizable spin-orbit coupling present in these systems, which translates anisotropies in real space into anisotropies in spin space. We present nuclear magnetic resonance studies, which reveal that the magnetic fluctuation spectrum in the paramagnetic phase of BaFe2As2 acquires an anisotropic response in spin-space upon application of a tetragonal symmetry-breaking strain field. Our results unveil an internal spin structure of the nematic order parameter, indicating that electronic nematic materials may offer a route to magneto-mechanical control. A fundamental understanding of nematic order is one of the most important issues to explore in the high temperature superconductors. Here, the authors unveil an internal spin structure of the nematic order in BaFe2As2 by using nuclear magnetic resonance under precisely controlled tunable strain.
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Affiliation(s)
- T Kissikov
- Department of Physics, University of California, Davis, CA, 95616, USA
| | - R Sarkar
- Institute for Solid State Physics, TU Dresden, D-01069, Dresden, Germany
| | - M Lawson
- Department of Physics, University of California, Davis, CA, 95616, USA
| | - B T Bush
- Department of Physics, University of California, Davis, CA, 95616, USA
| | - E I Timmons
- Ames Laboratory U.S. DOE and Department of Physics and Astronomy, Iowa State University, Ames, IA, 50011, USA
| | - M A Tanatar
- Ames Laboratory U.S. DOE and Department of Physics and Astronomy, Iowa State University, Ames, IA, 50011, USA
| | - R Prozorov
- Ames Laboratory U.S. DOE and Department of Physics and Astronomy, Iowa State University, Ames, IA, 50011, USA
| | - S L Bud'ko
- Ames Laboratory U.S. DOE and Department of Physics and Astronomy, Iowa State University, Ames, IA, 50011, USA
| | - P C Canfield
- Ames Laboratory U.S. DOE and Department of Physics and Astronomy, Iowa State University, Ames, IA, 50011, USA
| | - R M Fernandes
- School of Physics and Astronomy, University of Minnesota, Minneapolis, MN, 55455, USA
| | - N J Curro
- Department of Physics, University of California, Davis, CA, 95616, USA.
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Singsardar M, Sarkar R, Majhi K, Sinha S, Hajra A. Brønsted Acidic Ionic Liquid-Catalyzed Regioselective Synthesis of Pyrazolopyrimidines and Their Photophysical Properties. ChemistrySelect 2018. [DOI: 10.1002/slct.201702767] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Mukta Singsardar
- Department of Chemistry; Visva-Bharati (A Central University); Santiniketan 731235, West Bengal India
| | - Rajib Sarkar
- Department of Chemistry; Visva-Bharati (A Central University); Santiniketan 731235, West Bengal India
| | - Koushik Majhi
- Integrated Science Education and Research Centre; Siksha Bhavana; Visva-Bharati; Santiniketan 731 235 India
| | - Subrata Sinha
- Integrated Science Education and Research Centre; Siksha Bhavana; Visva-Bharati; Santiniketan 731 235 India
| | - Alakananda Hajra
- Department of Chemistry; Visva-Bharati (A Central University); Santiniketan 731235, West Bengal India
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Sarkar R, Ravanan R, Williams AJ, Birch PA, Banks RA. Restoration of Acutely Thrombosed Arterio-Venous Fistulae by rTPA and Percutaneous Angioplasty. J Vasc Access 2018; 2:150-3. [PMID: 17638279 DOI: 10.1177/112972980100200404] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Acute thrombosis in native arterio-venous fistulae (AVF) results in considerable patient morbidity. Interventional radiology (IR) comprising thrombolysis and percutaneous transluminal angioplasty (PTA) is well established in the management of thrombosed polytetrafluoroethylene (PTFE) grafts. However its role in thrombosed AVF is uncertain. We looked retrospectively at the role of IR in re-establishing blood flow in acutely thrombosed AVF. Between 1992–2000, 21 episodes of acutely thrombosed AVF in 15 patients (9 females; age range 29–80yrs) were referred for intervention. All fistulae were being used for haemodialysis at the time. Diagnosis was established by angiography and thrombolysis with recombinant tissue plasminogen activator (rTPA) was attempted in all patients. Discrete stenoses when present (n=12) were then treated with PTA and resistant or recurrent stenoses were managed by stent insertion (n=3). Patients were then heparinised for 24 hours. Technical success as defined by radiological patency was achieved in 86% cases. Clinical success i.e. the ability to reuse of the fistula for haemodialysis was achieved in 62% of the interventions, where patency rates at 3 and 6 months were 92% and 69% respectively. Five patients had recurrence of thrombosis >3 months after the primary procedure, 3 had successful re-intervention. Minor local bleeding was the only complication. Our retrospective study shows rTPA and PTA is successful in the management of acutely thrombosed AVF. We advocate the routine use of IR as a valuable technique for prolonging the life of native AVF in patients on maintenance haemodialysis.
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Affiliation(s)
- R Sarkar
- Departments of Renal Medicine, Gloucestershire Royal Hospital, Gloucester, UK
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Nikitin AM, Grinenko V, Sarkar R, Orain JC, Salis MV, Henke J, Huang YK, Klauss HH, Amato A, Visser AD. Macroscopic phase separation of superconductivity and ferromagnetism in Sr 0.5Ce 0.5FBiS 2-x Se x revealed by μSR. Sci Rep 2017; 7:17370. [PMID: 29234110 PMCID: PMC5727222 DOI: 10.1038/s41598-017-17637-y] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2017] [Accepted: 11/28/2017] [Indexed: 11/24/2022] Open
Abstract
The compound Sr0.5Ce0.5FBiS2 belongs to the intensively studied family of layered BiS2 superconductors. It attracts special attention because superconductivity at Tsc = 2.8 K was found to coexist with local-moment ferromagnetic order with a Curie temperature TC = 7.5 K. Recently it was reported that upon replacing S by Se TC drops and ferromagnetism becomes of an itinerant nature. At the same time Tsc increases and it was argued superconductivity coexists with itinerant ferromagnetism. Here we report a muon spin rotation and relaxation study (μSR) conducted to investigate the coexistence of superconductivity and ferromagnetic order in Sr0.5Ce0.5FBiS2−xSex with x = 0.5 and 1.0. By inspecting the muon asymmetry function we find that both phases do not coexist on the microscopic scale, but occupy different sample volumes. For x = 0.5 and x = 1.0 we find a ferromagnetic volume fraction of ~8 % and ~30 % at T = 0.25 K, well below TC = 3.4 K and TC = 3.3 K, respectively. For x = 1.0 (Tsc = 2.9 K) the superconducting phase occupies most (~64 %) of the remaining sample volume, as shown by transverse field experiments that probe the Gaussian damping due to the vortex lattice. We conclude ferromagnetism and superconductivity are macroscopically phase separated.
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Affiliation(s)
- A M Nikitin
- Van der Waals - Zeeman Institute, University of Amsterdam, 1098 XH, Amsterdam, The Netherlands. .,Laboratory for Muon-Spin Spectroscopy, Paul Scherrer Institute, 5232 Villigen PSI, Switzerland.
| | - V Grinenko
- Institute of Solid State and Materials Physics, Technical University Dresden, 01062, Dresden, Germany.,Leibniz Institute for Solid State and Materials Research (IFW), 01069, Dresden, Germany
| | - R Sarkar
- Institute of Solid State and Materials Physics, Technical University Dresden, 01062, Dresden, Germany
| | - J-C Orain
- Laboratory for Muon-Spin Spectroscopy, Paul Scherrer Institute, 5232, Villigen PSI, Switzerland
| | - M V Salis
- Van der Waals - Zeeman Institute, University of Amsterdam, 1098 XH, Amsterdam, The Netherlands
| | - J Henke
- Van der Waals - Zeeman Institute, University of Amsterdam, 1098 XH, Amsterdam, The Netherlands
| | - Y K Huang
- Van der Waals - Zeeman Institute, University of Amsterdam, 1098 XH, Amsterdam, The Netherlands
| | - H-H Klauss
- Institute of Solid State and Materials Physics, Technical University Dresden, 01062, Dresden, Germany
| | - A Amato
- Laboratory for Muon-Spin Spectroscopy, Paul Scherrer Institute, 5232, Villigen PSI, Switzerland
| | - A de Visser
- Van der Waals - Zeeman Institute, University of Amsterdam, 1098 XH, Amsterdam, The Netherlands.
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Khaiboullina SF, Uppal T, Sarkar R, Gorzalski A, St Jeor S, Verma SC. ZIKV infection regulates inflammasomes pathway for replication in monocytes. Sci Rep 2017; 7:16050. [PMID: 29167459 PMCID: PMC5700238 DOI: 10.1038/s41598-017-16072-3] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2017] [Accepted: 11/07/2017] [Indexed: 12/14/2022] Open
Abstract
ZIKV causes microcephaly by crossing the placental barrier, however, the mechanism of trans-placental dissemination of ZIKV remains unknown. Here, we sought to determine whether monocytes, which can cross tissue barriers, assist ZIKV dissemination to the fetus. We determined this by infecting monocytes with two strains of ZIKV: South American (PRVABC59) and Nigerian (IBH30656) and analyzing viral replication. We found that ZIKV infects and replicates in monocytes and macrophages, which results in the modulation of a large number of cellular genes. Analysis of these genes identified multiple pathways including inflammasome to be targeted by ZIKV, which was confirmed by analyzing the transcript levels of the proteins of inflammasome pathways, NLRP3, ASC, caspase 1, IL-1 and IL-18. Interestingly, IFNα and the IFN inducible gene, MxA were not enhanced, suggesting prevention of innate antiviral defense by ZIKV. Also, inhibition of inflammasome led to an increased transcriptional activity of IFNα, MxA and CXCL10. Based on these results we suggest that ZIKV transcription is regulated by inflammasomes.
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Affiliation(s)
- S F Khaiboullina
- Department of Microbiology and Immunology, University of Nevada, Reno School of Medicine, Reno, NV, USA
- Kazan Federal University, Kazan, Russian Federation
| | - T Uppal
- Department of Microbiology and Immunology, University of Nevada, Reno School of Medicine, Reno, NV, USA
| | - R Sarkar
- Department of Microbiology and Immunology, University of Nevada, Reno School of Medicine, Reno, NV, USA
| | | | - S St Jeor
- Department of Microbiology and Immunology, University of Nevada, Reno School of Medicine, Reno, NV, USA
- Genquest LLC, Sparks, NV, USA
| | - S C Verma
- Department of Microbiology and Immunology, University of Nevada, Reno School of Medicine, Reno, NV, USA.
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Abstract
BACKGROUND Psychological factors have been prominently implicated in the causation as well as maintenance of irritable bowel syndrome (IBS). Studies comparing psychiatric morbidity in IBS with healthy controls have reported contrasting findings. The current study was undertaken to assess the prevalence of anxiety and depression in patients with IBS in comparison to healthy controls and to explore the relationship, if any, of anxiety and depression with various subtypes of IBS. MATERIALS AND METHODS Fifty consecutive patients of IBS (diagnosed as per Rome III criteria) between 18 and 65 years of age and fifty age- and sex-matched healthy controls were assessed for the presence of anxiety and depression using Hamilton Rating Scale for Anxiety (HAMA) and Hamilton Rating Scale for Depression (HAMD), respectively. RESULTS The patient group scored higher than controls (P < 0.001) in both HAMA and HAMD scores. The HAMA scores were significantly higher (P < 0.001) in the severe IBS group compared to those with moderate IBS. HAMA scores predicted 25.6% (R2 = 0.256) of variance in IBS severity scores. However, there was no significant difference between the two groups in terms of HAMD scores. CONCLUSION The high prevalence of psychiatric comorbidities such as anxiety and depression in IBS samples in our study provides evidence in favor of proper screening for these disorders in gastrointestinal clinics. Recognition and treatment for these comorbidities can improve the quality of life as well as overall outcomes.
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Affiliation(s)
- Arko Banerjee
- Department of Gastroenterology, School of Digestive and Liver Diseases, IPGMER and SSKM Hospital, Kolkata, West Bengal, India
| | - Sujit Sarkhel
- Department of Psychiatry, Institute of Psychiatry, IPGMER and SSKM Hospital, Kolkata, West Bengal, India
| | - Rajib Sarkar
- Department of Gastroenterology, School of Digestive and Liver Diseases, IPGMER and SSKM Hospital, Kolkata, West Bengal, India
| | - Gopal Krishna Dhali
- Department of Gastroenterology, School of Digestive and Liver Diseases, IPGMER and SSKM Hospital, Kolkata, West Bengal, India
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Kissikov T, Sarkar R, Bush BT, Lawson M, Canfield PC, Curro NJ. Nuclear magnetic resonance probe head design for precision strain control. Rev Sci Instrum 2017; 88:103902. [PMID: 29092471 DOI: 10.1063/1.5002631] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
We present the design and construction of an NMR probe to investigate single crystals under strain at cryogenic temperatures. The probe head incorporates a piezoelectric-based apparatus from Razorbill Instruments that enables both compressive and tensile strain tuning up to strain values on the order of 0.3% with a precision of 0.001%. 75As NMR in BaFe2As2 reveals large changes to the electric field gradient and indicates that the strain is homogeneous to within 16% over the volume of the NMR coil.
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Affiliation(s)
- T Kissikov
- Department of Physics, University of California, Davis, California 95616, USA
| | - R Sarkar
- Institute for Solid State Physics, TU Dresden, D-01069 Dresden, Germany
| | - B T Bush
- Department of Physics, University of California, Davis, California 95616, USA
| | - M Lawson
- Department of Physics, University of California, Davis, California 95616, USA
| | - P C Canfield
- Ames Laboratory U.S. DOE and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA
| | - N J Curro
- Department of Physics, University of California, Davis, California 95616, USA
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Debnath M, Sarkar R, Nandi SK, Haldar D. C-Terminal -Aib-L-Leu-OMe Segment Promotes Schellman Loop from α-Peptides with Alternating L-Leu and Aib Residues in the Crystal State. ChemistrySelect 2017. [DOI: 10.1002/slct.201701577] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Mintu Debnath
- Department of Chemical Sciences; Indian Institute of Science Education and Research Kolkata; Mohanpur 741246, West Bengal India
| | - Rajib Sarkar
- Department of Chemical Sciences; Indian Institute of Science Education and Research Kolkata; Mohanpur 741246, West Bengal India
| | - Sujay Kumar Nandi
- Department of Chemical Sciences; Indian Institute of Science Education and Research Kolkata; Mohanpur 741246, West Bengal India
| | - Debasish Haldar
- Department of Chemical Sciences; Indian Institute of Science Education and Research Kolkata; Mohanpur 741246, West Bengal India
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