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Banerjee J, Batabyal S, Biswas S, Bhattacharyya D, Habib M, Das AK, Nanda PK, Samanta I, Dandapat P, Bandyopadhyay S. Stray Dogs (Mongrels) Are Potent Reservoir of Drug-Resistant Pathogens: A Study in Peri-Urban Areas of Kolkata, India. Microb Drug Resist 2024. [PMID: 38656133 DOI: 10.1089/mdr.2023.0249] [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: 04/26/2024] Open
Abstract
This study depicts the drug-resistance and phylogenomic characteristics of 365 Escherichia coli (EC) and 76 Klebsiella pneumoniae (KP) isolated from stray dogs (293) in and around Kolkata, India. Initial screening found 59 isolates, including 48 E. coli and 11 KP multidrug resistant, which included 33 extended-spectrum β-lactamase, 41 AmpC β-lactamase and 18 metallo-β-lactamase producers carrying blaNDM-1 (11) and blaNDM-5 (7) genes. Majority of them had the resistant genes such as blaCTX-M (33), blaTEM (18), blaSHV (4), blaOXA (17), blaFOX (2), blaDHA (2), blaCITM (15), blaCMY-2 (13), blaGES (2) and blaVEB (2), qnrS (15), qnrB (3), aac-6'-Ib-cr (14), tetA (26), tetB (14), sul-1 (25), armA (2) and rmtB (6), in addition to adherence genes such as csgA (33), fimA (27), fliC (13), sdiA (33), rcsA (38), and rpoS (39). They also carried plasmid of diverse replicon types of which IncFIA and FIB were the most frequent. Phylogrouping categorized most of the MDR E. coli in phylogroup A (20), B1 (14), and B2 (6). Enterobacteriaceae repetitive intergenic consensus-polymerase chain reaction (ERIC-PCR) showed genetic diversity of multidrug resistant isolates irrespective of their origin, resistance, and virulence types, differentiating the EC in five clades (A-E) and KP in four clades (A-D). As these stray dogs, which had no history or scope of previous antimicrobial therapy, were found to have contracted potential antimicrobial resistance pathogens, the role of environment in spread of such pathogens and further possibility of human infections cannot be ruled out.
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Affiliation(s)
- Jaydeep Banerjee
- ICAR-Indian Veterinary Research Institute, Eastern Regional Station, Kolkata, India
| | - Subhasis Batabyal
- West Bengal University of Animal and Fishery Sciences, Kolkata, India
| | - Suman Biswas
- West Bengal University of Animal and Fishery Sciences, Kolkata, India
| | | | - Md Habib
- ICAR-Indian Veterinary Research Institute, Eastern Regional Station, Kolkata, India
| | - Arun K Das
- ICAR-Indian Veterinary Research Institute, Eastern Regional Station, Kolkata, India
| | - Pramod K Nanda
- ICAR-Indian Veterinary Research Institute, Eastern Regional Station, Kolkata, India
| | - Indranil Samanta
- West Bengal University of Animal and Fishery Sciences, Kolkata, India
| | - Premanshu Dandapat
- ICAR-Indian Veterinary Research Institute, Eastern Regional Station, Kolkata, India
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Saifi S, Dey G, Shakir R, Karthikeyan J, Kumar R, Bhattacharyya D, Sinha ASK, Aijaz A. Single-Atomic Co-N 4 Sites with CrCo Nanoparticles for Metal-Air Battery-Driven Hydrogen Evolution. Inorg Chem 2024; 63:7218-7232. [PMID: 38593245 DOI: 10.1021/acs.inorgchem.3c04443] [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: 04/11/2024]
Abstract
Designing highly active and robust earth abundant trifunctional electrocatalysts for energy storage and conversion applications remain an enormous challenge. Herein, we report a trifunctional electrocatalyst (CrCo/CoN4@CNT-5), synthesized at low calcination temperature (550 °C), which consists of Co-N4 single atom and CrCo alloy nanoparticles and exhibits outstanding electrocatalytic performance for the hydrogen evolution reaction, oxygen evolution reaction, and oxygen reduction reaction. The catalyst is able to deliver a current density of 10 mA cm-2 in an alkaline electrolytic cell at a very low cell voltage of ∼1.60 V. When the catalyst is equipped in a liquid rechargeable Zn-air battery, it endowed a high open-circuit voltage with excellent cycling durability and outperformed the commercial Pt/C+IrO2 catalytic system. Furthermore, the Zn-air battery powered self-driven water splitting system is displayed using CrCo/CoN4@CNT-5 as sole trifunctional catalyst, delivering a high H2 evolution rate of 168 μmol h-1. Theoretical calculations reveal synergistic interaction between Co-N4 active sites and CrCo nanoparticles, favoring the Gibbs free energy for H2 evolution. The presence of Cr not only enhances the H2O adsorption and dissociation but also tunes the electronic property of CrCo nanoparticles to provide optimized hydrogen binding capacity to Co-N4 sites, thus giving rise to accelerated H2 evolution kinetics. This work highlights the importance of the presence of small quantity of Cr in enhancing the electrocatalytic activity as well as robustness of single-atom catalyst and suggests the design of the multifunctional robust electrocatalysts for long-term H2 evolution application.
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Affiliation(s)
- Shadab Saifi
- Department of Sciences & Humanities, Rajiv Gandhi Institute of Petroleum Technology (RGIPT)-Jais, Amethi, Uttar Pradesh 229304, India
| | - Gargi Dey
- Department of Sciences & Humanities, Rajiv Gandhi Institute of Petroleum Technology (RGIPT)-Jais, Amethi, Uttar Pradesh 229304, India
| | - Renna Shakir
- Department of Sciences & Humanities, Rajiv Gandhi Institute of Petroleum Technology (RGIPT)-Jais, Amethi, Uttar Pradesh 229304, India
| | - Jeyakumar Karthikeyan
- Department of Sciences & Humanities, Rajiv Gandhi Institute of Petroleum Technology (RGIPT)-Jais, Amethi, Uttar Pradesh 229304, India
- Department of Physics, National Institute of Technology, Durgapur 713209, West Bengal, India
| | - Ravi Kumar
- Atomic & Molecular Physics Division, Bhabha Atomic Research Centre, Mumbai 400094, India
| | - D Bhattacharyya
- Atomic & Molecular Physics Division, Bhabha Atomic Research Centre, Mumbai 400094, India
| | - A S K Sinha
- Department of Chemical Engineering & Biochemical Engineering, Rajiv Gandhi Institute of Petroleum Technology (RGIPT) - Jais, Amethi, Uttar Pradesh 229304, India
| | - Arshad Aijaz
- Department of Sciences & Humanities, Rajiv Gandhi Institute of Petroleum Technology (RGIPT)-Jais, Amethi, Uttar Pradesh 229304, India
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Dey G, Jana R, Saifi S, Kumar R, Bhattacharyya D, Datta A, Sinha ASK, Aijaz A. Dual Single-Atomic Co-Mn Sites in Metal-Organic-Framework-Derived N-Doped Nanoporous Carbon for Electrochemical Oxygen Reduction. ACS Nano 2023; 17:19155-19167. [PMID: 37774140 DOI: 10.1021/acsnano.3c05379] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/01/2023]
Abstract
Synthesizing dual single-atom catalysts (DSACs) with atomically isolated metal pairs is a challenging task but can be an effective way to enhance the performance for electrochemical oxygen reduction reaction (ORR). Herein, well-defined DSACs of Co-Mn, stabilized in N-doped porous carbon polyhedra (named CoMn/NC), are synthesized using high-temperature pyrolysis of a Co/Mn-doped zeolitic imidazolate framework. The atomically isolated Co-Mn site in CoMn/NC is recognized by combining microscopic as well as spectroscopic techniques. CoMn/NC exhibited excellent ORR activities in alkaline (E1/2 = 0.89 V) as well as in acidic (E1/2 = 0.82 V) electrolytes with long-term durability and enhanced methanol tolerance. Density functional theory (DFT) suggests that the Co-Mn site is efficiently activating the O-O bond via bridging adsorption, decisive for the 4e- oxygen reduction process. Though the Co-Mn sites favor O2 activation via the dissociative ORR mechanism, stronger adsorption of the intermediates in the dissociative path degrades the overall ORR activity. Our DFT studies conclude that the ORR on an Co-Mn site mainly occurs via bridging side-on O2 adsorption following thermodynamically and kinetically favorable associative mechanistic pathways with a lower overpotential and activation barrier. CoMn/NC performed excellently as a cathode in a proton exchange membrane (PEM) fuel cell and rechargeable Zn-air battery with high peak power densities of 970 and 176 mW cm-2, respectively. This work provides the guidelines for the rational design and synthesis of nonprecious DSACs for enhancing the ORR activity as well as the robustness of DSACs and suggests a design of multifunctional robust electrocatalysts for energy storage and conversion devices.
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Affiliation(s)
- Gargi Dey
- Department of Sciences & Humanities, Rajiv Gandhi Institute of Petroleum Technology (RGIPT) - Jais, Amethi, Uttar Pradesh 229304, India
| | - Rajkumar Jana
- School of Chemical Sciences, Indian Association for the Cultivation of Science (IACS), Kolkata 700032, India
| | - Shadab Saifi
- Department of Sciences & Humanities, Rajiv Gandhi Institute of Petroleum Technology (RGIPT) - Jais, Amethi, Uttar Pradesh 229304, India
| | - Ravi Kumar
- Atomic & Molecular Physics Division, Bhabha Atomic Research Centre, Mumbai 400094, India
| | - D Bhattacharyya
- Atomic & Molecular Physics Division, Bhabha Atomic Research Centre, Mumbai 400094, India
| | - Ayan Datta
- School of Chemical Sciences, Indian Association for the Cultivation of Science (IACS), Kolkata 700032, India
| | - A S K Sinha
- Department of Chemical & Biochemical Engineering, Rajiv Gandhi Institute of Petroleum Technology (RGIPT) - Jais, Amethi, Uttar Pradesh 229304, India
| | - Arshad Aijaz
- Department of Sciences & Humanities, Rajiv Gandhi Institute of Petroleum Technology (RGIPT) - Jais, Amethi, Uttar Pradesh 229304, India
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Banerjee D, Dey CC, Kumar R, Modak B, Hazra S, Datta S, Ghosh B, Thakare SV, Jha SN, Bhattacharyya D. Comprehensive study on the origin of orthorhombic phase stabilization in Gd-doped HfO 2 and DFT calculations. Phys Chem Chem Phys 2023; 25:21479-21491. [PMID: 37539659 DOI: 10.1039/d3cp00062a] [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: 08/05/2023]
Abstract
In recent times, ultra-thin films of hafnium oxide (HfO2) have shown ferroelectricity (FE) attributed to the orthorhombic (o) phase of HfO2 with space group Pca21. This polar o-phase could be stabilized in the doped thin film of the oxide. In the present work, both polar and non-polar o-phases of HfO2 could be stabilized in Gd-doped bulk polycrystalline HfO2. Rietveld analysis of XRD data shows that the relative population of o-phases in the presence of the monoclinic (m) phase of HfO2 increases with increasing Gd-content. The local environment around the host atom has been investigated by time differential perturbed angular correlation (TDPAC) spectroscopy, synchrotron based X-ray near edge structure (XANES) and extended X-ray absorption fine structure (EXAFS) measurements. Field emission scanning electron microscopy (FESEM) and transmission electron microscopy (TEM) measurements showed a reduction in grain size with increasing Gd-dopant indicating a solute drag effect. It could be established that the segregation of the Gd-dopant in the grain boundary is a thermodynamically favorable process and the solute drag effect plays an important role in nucleation of the o-phase in bulk HfO2. Stabilization of Gd in both Pbca and Pca21 phases of HfO2 was supported by defect formation energy calculations using density functional theory (DFT). The present study has important implications in future applications of HfO2 in ferroelectric devices and in understanding the role of dopants in stabilizing the o-phase of HfO2 in the bulk.
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Affiliation(s)
- D Banerjee
- Radiochemistry Division (BARC), Variable Energy Cyclotron Centre, Kolkata 700064, India.
- Homi Bhabha National Institute, Anushaktinagar, Mumbai 400094, India
| | - C C Dey
- Applied Nuclear Physics Division, Saha Institute of Nuclear Physics, Kolkata 700064, India
- Homi Bhabha National Institute, Anushaktinagar, Mumbai 400094, India
| | - Ravi Kumar
- Atomic & Molecular Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, India
| | - Brindaban Modak
- Chemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400085, India
| | - Snehamoyee Hazra
- Department of Condensed Matter and Materials Physics, S. N. Bose National Centre for Basic Sciences, JD Block, Sector-III, Salt Lake City, Kolkata 700106, India
| | - Subarna Datta
- Material Science Section, Physics Group, Variable Energy Cyclotron Centre, 1/AF, Bidhan Nagar, Kolkata 700064, India
| | - Barnali Ghosh
- Department of Condensed Matter and Materials Physics, S. N. Bose National Centre for Basic Sciences, JD Block, Sector-III, Salt Lake City, Kolkata 700106, India
| | - S V Thakare
- Radiopharmaceutical Division, Bhabha Atomic Research Centre, Mumbai 400085, India
| | - S N Jha
- Beamline Development and Application Section, Bhabha Atomic Research Centre, Mumbai 400085, India
| | - D Bhattacharyya
- Atomic & Molecular Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, India
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Saifi S, Dey G, Karthikeyan J, Kumar R, Bhattacharyya D, Sinha ASK, Aijaz A. Coupling Single-Ni-Atom with Ni-Co Alloy Nanoparticle for Synergistically Enhanced Oxygen Reduction Reaction. Inorg Chem 2023; 62:8200-8209. [PMID: 37196161 DOI: 10.1021/acs.inorgchem.3c00584] [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: 05/19/2023]
Abstract
Developing nonprecious metal-based oxygen reduction reaction (ORR) electrocatalysts with superior activity and durability is crucial for commercializing proton-exchange membrane (PEM) fuel cells. Herein, we report a metal-organic framework (MOF)-derived unique N-doped hollow carbon structure (NiCo/hNC), comprising of atomically dispersed single-Ni-atom (NiN4) and small NiCo alloy nanoparticles (NPs), for highly efficient and durable ORR catalysis in both alkaline and acidic electrolytes. Density functional theory (DFT) calculations reveal the strong coupling between NiN4 and NiCo NPs, favoring the direct 4e- transfer ORR process by lengthening the adsorbed O-O bond. Moreover, NiCo/hNC as a cathode electrode in PEM fuel cells delivered a stable performance. Our findings not only furnish the fundamental understanding of the structure-activity relationship but also shed light on designing advanced ORR catalysts.
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Affiliation(s)
- Shadab Saifi
- Department of Sciences & Humanities, Rajiv Gandhi Institute of Petroleum Technology (RGIPT), Jais, Amethi, Uttar Pradesh 229304, India
| | - Gargi Dey
- Department of Sciences & Humanities, Rajiv Gandhi Institute of Petroleum Technology (RGIPT), Jais, Amethi, Uttar Pradesh 229304, India
| | - J Karthikeyan
- Department of Sciences & Humanities, Rajiv Gandhi Institute of Petroleum Technology (RGIPT), Jais, Amethi, Uttar Pradesh 229304, India
- Department of Physics, National Institute of Technology, Durgapur 713209, West Bengal, India
| | - Ravi Kumar
- Atomic & Molecular Physics Division, Bhabha Atomic Research Centre, Mumbai 400094, India
| | - D Bhattacharyya
- Atomic & Molecular Physics Division, Bhabha Atomic Research Centre, Mumbai 400094, India
| | - A S K Sinha
- Department of Chemical Engineering & Biochemical Engineering, Rajiv Gandhi Institute of Petroleum Technology (RGIPT), Jais, Amethi, Uttar Pradesh 229304, India
| | - Arshad Aijaz
- Department of Sciences & Humanities, Rajiv Gandhi Institute of Petroleum Technology (RGIPT), Jais, Amethi, Uttar Pradesh 229304, India
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Sarkar P, Biswas A, Kumar R, Rai S, Jha SN, Bhattacharyya D. Role of C and B 4C barrier layers in controlling diffusion propagation across the interface of Cr/Sc multilayers. Phys Chem Chem Phys 2023; 25:3072-3082. [PMID: 36620902 DOI: 10.1039/d2cp03785h] [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: 01/10/2023]
Abstract
The optical performance of low-bilayer-thickness metallic multilayers (ML) can be improved significantly by limiting the intermixing of consecutive layers at the interfaces. Barrier layers are supposed to exhibit a decisive role in controlling diffusion across the interfaces. The element-specific grazing incidence extended X-ray absorption fine structure technique using synchrotron radiation has been used in conjunction with grazing incidence X-ray reflectivity and diffuse X-ray scattering measurements to study the impact of the two most common barrier layers, viz., C and B4C, at the interfaces of Cr/Sc MLs. The diffusion propagation is reduced by both the barrier layers; however, it is found that the improvement is more significant with the B4C barrier layer. It is seen that C forms an intermixed layer with Sc and leads to carbide formation at the interface, which then acts as shielding and prevents further interdiffusion, while B4C hardly penetrates into Sc and stops the overlap between Sc and Cr directly by wetting the corresponding interface. Thus, the above measurements reveal crucial and precise information regarding the elemental diffusion kinetics at the interfaces of Cr/Sc MLs in a non-destructive way, which is very important for technological applications of these MLs as X-ray optical devices.
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Affiliation(s)
- P Sarkar
- Atomic & Molecular Physics Division, Bhabha Atomic Research Centre, Mumbai 400 085, India.
| | - A Biswas
- Atomic & Molecular Physics Division, Bhabha Atomic Research Centre, Mumbai 400 085, India.
| | - Ravi Kumar
- Atomic & Molecular Physics Division, Bhabha Atomic Research Centre, Mumbai 400 085, India.
| | - S Rai
- Synchrotron Utilisation Section, Raja Ramnna Centre for Advanced Technology, Indore 752013, India
| | - S N Jha
- Beamline Development & Applications Section Bhabha Atomic Research Centre, Mumbai 400 085, India
| | - D Bhattacharyya
- Atomic & Molecular Physics Division, Bhabha Atomic Research Centre, Mumbai 400 085, India.
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Chatterjee T, Bhattacharyya D, Yadav A, Pal M. Quantification of physiological and mental workloads of faster and slower finishers of a long-distance military training activity. BMJ Mil Health 2022:e002154. [PMID: 36283744 DOI: 10.1136/military-2022-002154] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2022] [Accepted: 09/24/2022] [Indexed: 06/16/2023]
Abstract
BACKGROUND Long-distance runs with equipment are practised in military training establishments to develop physical stamina and prepare for battles. A study was planned to quantify and compare the physiological and mental workloads of the early and late finishers of a military endurance run through the jungle terrain of north-eastern India in hot and humid conditions. METHODS Twenty-five soldiers of the Indian Army completed a 15 km run through a rural and jungle track with 6.5 kg of equipment. Twelve participants who finished the race before 130 min were categorised as 'early finishers', and 13 were categorised as 'late finishers' who finished the race after 130 min. Physiological parameters, viz., heart rate (HR), breathing rate (BR), estimated core temperature (ECT), peak acceleration (PAC), and physiological intensity (PHYI) and mechanical intensity (MECHI) were recorded using BioHarness V.3 (Zephyr Technologies, USA) and NASA Task Load Index scores were obtained to assess mental workload. Mann-Whitney U test was applied to assess the level of significance at a p value of <0.05. RESULTS HR, ECT and PAC were significantly higher (167.9 and 156.0 beats/min, 39.0℃ and 38.4℃, and 1.1 and 1.0 g, respectively) for the first group compared with the second group. The second group expressed higher BR and subjective responses ('total scores' were 76.5 and 82.5, respectively) than the first. The PHYI was significantly higher (from 7.2 to 6.3) for the first group, whereas the MECHI was similar in both groups. CONCLUSION The successful completion by the first group can be attributed to their motivation to continue heavy work in an adverse environment, and their ability to negotiate with natural obstacles was reflected through controlled subjective responses. Adoption of a possible safe and stable approach to the same task might have led the second group to take a longer duration, exert higher mental effort and demand lower physiological cost.
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Affiliation(s)
- Tirthankar Chatterjee
- Ergonomics, DRDO Defence Institute of Physiology and Allied Sciences, New Delhi, Delhi, India
| | - D Bhattacharyya
- Ergonomics, DRDO Defence Institute of Physiology and Allied Sciences, New Delhi, Delhi, India
| | - A Yadav
- Ergonomics, DRDO Defence Institute of Physiology and Allied Sciences, New Delhi, Delhi, India
| | - M Pal
- Ergonomics, DRDO Defence Institute of Physiology and Allied Sciences, New Delhi, Delhi, India
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Banerjee J, Bhattacharyya D, Habib M, Chaudhary S, Biswas S, Maji C, Nanda PK, Das AK, Dandapat P, Samanta I, Lorenzo JM, Dutt T, Bandyopadhyay S. Antimicrobial Resistance Pattern, Clustering Mechanisms and Correlation Matrix of Drug-Resistant Escherichia coli in Black Bengal Goats in West Bengal, India. Antibiotics (Basel) 2022; 11:antibiotics11101344. [PMID: 36290002 PMCID: PMC9598321 DOI: 10.3390/antibiotics11101344] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2022] [Revised: 09/26/2022] [Accepted: 09/28/2022] [Indexed: 11/09/2022] Open
Abstract
A cross-sectional study covering four agro-climatic zones of West Bengal, India, was carried out to understand the risk-factors, antimicrobial resistance mechanism and clustering of the resistance characteristics of Escherichia coli isolated from healthy (170) and diarrhoeic (74) goats reared under intensive (52) and semi-intensive (192) farming practices. Of the 488 E. coli isolates, the majority, including the extended spectrum (n: 64, 13.11%) and AmpC β-lactamase (ACBL) (n: 86, 17.62%) producers, were resistant to tetracycline (25.2%), followed by enrofloxacin (24.5%), cefotaxime (21.5%) and amikacin (20.5%). Statistical modelling revealed that the isolates from diarrhoeic animals (p < 0.001) are likely to be more ACBL-positive than those from the healthy counterparts. Similarly, cefotaxime (p < 0.05) and enrofloxacin-resistance (p < 0.01) were significantly higher in diarrhoeic goats and in goats reared intensively. The isolates (n = 35) resistant to multiple drugs revealed the presence of β-lactamase [blaCTXM-1-(21), blaSHV-(7), blaTEM-(3), blaCMY-6-(1), blaCITM-(3)]; quinolone [qnrB-(10), qnrS-(7), aac(6’)-Ib-cr-(3)]; tetracycline [tetA-(19), tetB-(4)] and sulphonamide resistance determinants [sul1-(4)]; multiple plasmids, especially those belonging to the IncF and IncI1 replicon types; and active acrAB efflux pumps. Further, two isolates harbored the carbapenem resistance (blaNDM-5) gene and eight were strong biofilm producers. This first ever study conducted to unravel the status of AMR in goat farming reveals that not only the intensive farming practices but also certain clinical ailments such as diarrhoea can increase the shedding of the drug-resistant isolate. The emergence of multi-drug resistant (MDR) E. coli in goats, particularly those that are carbapenem resistant, is a cause for concern that indicates the spread of such pathogens even in the livestock sub-sector generally considered as naive.
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Affiliation(s)
- Jaydeep Banerjee
- ICAR-Indian Veterinary Research Institute, Eastern Regional Station, 37 Belgachia Road, Kolkata 700 037, India
| | - Debaraj Bhattacharyya
- ICAR-Indian Veterinary Research Institute, Eastern Regional Station, 37 Belgachia Road, Kolkata 700 037, India
| | - Md Habib
- ICAR-Indian Veterinary Research Institute, Eastern Regional Station, 37 Belgachia Road, Kolkata 700 037, India
| | - Siddharth Chaudhary
- ICAR-Indian Veterinary Research Institute, Eastern Regional Station, 37 Belgachia Road, Kolkata 700 037, India
| | - Suman Biswas
- Faculty of Veterinary Science, West Bengal University of Animal and Fishery Sciences, Kolkata 700 037, India
| | - Chinmoy Maji
- Faculty of Veterinary Science, West Bengal University of Animal and Fishery Sciences, Kolkata 700 037, India
| | - Pramod Kumar Nanda
- ICAR-Indian Veterinary Research Institute, Eastern Regional Station, 37 Belgachia Road, Kolkata 700 037, India
| | - Arun K. Das
- ICAR-Indian Veterinary Research Institute, Eastern Regional Station, 37 Belgachia Road, Kolkata 700 037, India
| | - Premanshu Dandapat
- ICAR-Indian Veterinary Research Institute, Eastern Regional Station, 37 Belgachia Road, Kolkata 700 037, India
| | - Indranil Samanta
- Faculty of Veterinary Science, West Bengal University of Animal and Fishery Sciences, Kolkata 700 037, India
| | - Jose M. Lorenzo
- Centro Tecnológico de la Carne de Galicia, Avd. Galicia nº 4, Parque Tecnológico de Galicia, San Cibrao das Viñas, 32900 Ourense, Spain
- Área de Tecnoloxía dos Alimentos, Facultade de Ciencias, Universidade de Vigo, 32004 Ourense, Spain
- Correspondence: (S.B.); (J.M.L.)
| | - Triveni Dutt
- Division of Livestock Production and Management, ICAR-Indian Veterinary Research Institute, Izatnagar 243 122, India
| | - Samiran Bandyopadhyay
- ICAR-Indian Veterinary Research Institute, Eastern Regional Station, 37 Belgachia Road, Kolkata 700 037, India
- Correspondence: (S.B.); (J.M.L.)
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Das SS, Mukherjee S, Chakrapani A, Bhattacharyya D. Clinical perspectives, immunohematologic insights, and transfusion management in IgA-associated autoimmune hemolytic anemia. Immunohematology 2022; 38:82-89. [PMID: 36190199 DOI: 10.21307/immunohematology-2022-047] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
Autoimmune hemolytic anemia (AIHA) due to warm-reacting IgA autoantibodies is rare. Here, we explored the clinical and immunohematologic characteristics of patients suffering from IgA-associated warm AIHA (WAIHA) and their transfusion management. The 9-year study included 214 patients with WAIHA who were further classified into two groups: (1) IgA-associated WAIHA and (2) non-IgA-associated WAIHA. Clinical and laboratory details were obtained from patient files and the Hospital Information System. All immunohematologic investigations were performed following standard operating procedures and established protocols. Among the 214 patients with WAIHA, 17 (7.9%) belonged to the IgA-associated group; of these, two IgA-only WAIHA cases were found. The mean hemoglobin in this group was 5.58 g/dL, and 15 (88.2%) of these patients received a total of 32 units of packed red blood cell (RBC) transfusions. In vivo hemolytic markers were significantly abnormal in the IgA-associated WAIHA group when compared with the non-IgA group. Secondary WAIHA was found in 11 (64.7%) patients with IgA-associated WAIHA. Patients with IgA-associated WAIHA received more blood transfusions than individuals in the non-IgA group (p = 0.0004). A total of 17 (7.9%) patients with WAIHA experienced adverse events to blood transfusion. Detailed characterization of WAIHA with particular emphasis on IgA-associated and non-IgA-associated WAIHA is essential to evaluate the disease characteristics, access the degree of hemolysis, understand the immunohematologic behaviors of the antibodies, and manage blood transfusions.
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Affiliation(s)
- S S Das
- Transfusion Medicine, Apollo Multispeciality Hospitals Ltd., 58 Canal Circular Road, Kadapara, Phool Bagan, Kankurgachi, Kolkata, West Bengal, India, 700054
| | - S Mukherjee
- Transfusion Medicine, Apollo Multispeciality Hospitals Ltd., Kolkata, India
| | - A Chakrapani
- Clinical Hematology, Apollo Multispeciality Hospitals Ltd., Kolkata, India
| | - D Bhattacharyya
- Clinical Hematology, Apollo Multispeciality Hospitals Ltd., Kolkata, India
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Tyagi AK, Sen M, Shukla R, Pathak N, Bhasin V, Jha SN, Bhattacharyya D, Sathian V, Chaudhury P. Al510/11bo9:Tb3+: Synthesis, Structural Characterization and Thermoluminescence Dosimetry Studies for High Intensity Thermal Neutron Beams. SSRN Journal 2022. [DOI: 10.2139/ssrn.4307861] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/19/2023]
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11
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Bhattacharyya D, Banerjee J, Habib M, Thapa G, Samanta I, Nanda PK, Dutt T, Sarkar K, Bandyopadhyay S. Elucidating the resistance repertoire, biofilm production, and phylogenetic characteristics of multidrug-resistant Escherichia coli isolated from community ponds: A study from West Bengal, India. Water Environ Res 2021; 94:e1678. [PMID: 34907618 DOI: 10.1002/wer.1678] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/09/2021] [Revised: 11/29/2021] [Accepted: 12/08/2021] [Indexed: 06/14/2023]
Abstract
This study details about the phenotypic and molecular characteristics of multidrug-resistant (MDR) Escherichia coli in the fresh community pond water (n = 257) collected from three districts of West Bengal, India. In total, 57 isolates were MDR of which 38 emerged as extended spectrum and 7 as AmpC-type β-lactamase producers in phenotypic assay. Among β-lactamase genes, blaCTXM-1was predominant (87.71%) followed by blaAmpC (77.2%) and blaTEM-1 (22.8%). Six MDR strains carried metallo-β-lactamase (MBL, blaNDM-1) gene. Tissue culture plate assay confirmed strong biofilm (SP) production in four MDR and one non-MDR isolates. In PCR-based replicon typing (PBRT), multiple plasmids of diverse replicon types (Frep, FIB, I1, FIA, K/B, HI1, and Y) were identified. The enterobacterial repetitive intergenic consensus-polymerase chain reaction (ERIC-PCR)-based phylogenetic analysis revealed a high degree of genetic divergence among the MDR isolates. Multiplex PCR-based phylogrouping categorized 11 isolates as virulent (B2/D/F), which carried blaCTXM-1 gene and three had blaNDM-1 gene. Relative transcriptional activity of AcrAB efflux pump was significantly elevated among the SP and MBL producers. The presence of MDR E. coli isolates, particularly those resistant to carbapenem, in pond water used for daily domestic and household work, is a cause of concern as these pathogens may sneak into human food chain causing life-threatening infections. PRACTITIONER POINTS: Multidrug-resistant biofilm producing E. coli isolated from community pond water. A few of them were carbapenem-resistant and belonged to virulent (B2/D) types. Expression of AcrAB efflux pumps was found significantly elevated among biofilm producers and carbapenem-resistant population.
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Affiliation(s)
- Debaraj Bhattacharyya
- ICAR-Indian Veterinary Research Institute, Kolkata, India
- Department of Microbiology, University of Kalyani, Kalyani, India
| | | | - Md Habib
- ICAR-Indian Veterinary Research Institute, Kolkata, India
| | | | - Indranil Samanta
- Department of Veterinary Microbiology, Faculty of Veterinary and Animal Sciences, West Bengal University of Animal & Fishery Sciences, Kolkata, India
| | | | - Triveni Dutt
- Division of Livestock Production and Management, ICAR-Indian Veterinary Research Institute, Izatnagar, India
| | - Keka Sarkar
- Department of Microbiology, University of Kalyani, Kalyani, India
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Singh GN, Bhattacharyya D, Bandyopadhyay A. Calibration estimation of population variance under stratified successive sampling in presence of random non response. COMMUN STAT-THEOR M 2021. [DOI: 10.1080/03610926.2020.1719158] [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: 10/25/2022]
Affiliation(s)
- G. N. Singh
- Department of Mathematics & Computing, Indian Institute of Technology (Indian School of Mines), Dhanbad, Jharkhand, India
| | - D. Bhattacharyya
- Department of Mathematics & Computing, Indian Institute of Technology (Indian School of Mines), Dhanbad, Jharkhand, India
| | - A. Bandyopadhyay
- Department of Mathematics, Asansol Engineering College, Asansol, West Bengal, India
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Bandyopadhyay S, Bhattacharyya D, Samanta I, Banerjee J, Habib M, Dutta TK, Dutt T. Characterization of Multidrug-Resistant Biofilm-Producing Escherichia coli and Klebsiella pneumoniae in Healthy Cattle and Cattle with Diarrhea. Microb Drug Resist 2021; 27:1457-1469. [PMID: 33913759 DOI: 10.1089/mdr.2020.0298] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023] Open
Abstract
This study describes comparative occurrence and characterization of multidrug-resistant (MDR) Escherichia coli and Klebsiella pneumoniae (KP) in healthy cattle (HC) and cattle with diarrhea (DC) in India. During 2018-2020, 72 MDR isolates, including 35 E. coli (DC: 27; HC 8) and 37 K. pneumoniae (DC: 34; HC: 3), from 251 rectal swabs (DC: 219; HC: 32) were investigated for extended-spectrum beta-lactamase (ESBL), AmpC type β-lactamase and carbapenemase production, antimicrobial susceptibility profile, biofilm production, and efflux pump activity. Fifty-five MDR isolates were ESBL producers (ESBLPs) (DC: 50; HC: 5) and ESBLPs from DC were coresistant to multiple antibiotics. The blaCTX-M gene (50) was the most frequently detected β-lactamases followed by blaAmpC (22), blaTEM1 (13), blaCMY-6 (6), blaOXA1 (5), blaPER (2), blaDHA, and blaFOX and blaSHV12 (1 each). Plasmid-mediated quinolone resistance determinants qnrB, qnrS, qnrA, and qepA were detected in 18, 16, 2, and 3 isolates, respectively. Twenty three isolates revealed mutation in gyrA and parC genes. Tetracycline-resistance markers tetA, tetB, tetC, and tetE were detected in 33, 10, 3, and 2 isolates, respectively. Only one of the 41 imipenem-resistant isolates harbored blaNDM-5 and two were colistin-resistant. Altogether, 20 MDR isolates were strong biofilm producers and 19 harbored different virulence factors. This is the first ever report from India on the presence of MDR Enterobacteriaceae with resistance to even last-resort antimicrobials in the bovine diarrhea.
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Affiliation(s)
| | | | - Indranil Samanta
- Department of Veterinary Microbiology, Faculty of Veterinary and Animal Sciences, West Bengal University of Animal and Fishery Sciences, Kolkata, India
| | - Jaydeep Banerjee
- ICAR-Indian Veterinary Research Institute, Eastern Regional Station, Kolkata, India
| | - Md Habib
- ICAR-Indian Veterinary Research Institute, Eastern Regional Station, Kolkata, India
| | - Tapan K Dutta
- C.V.Sc. & A.H, Central Agricultural University, Aizawl, India
| | - Triveni Dutt
- Division of Livestock Production and Management, ICAR-Indian Veterinary Research Institute, Izatnagar, India
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Nayak C, Abharana N, Modak B, Halankar K, Jha SN, Bhattacharyya D. Insight into the charging-discharging of magnetite electrodes: in situ XAS and DFT study. Phys Chem Chem Phys 2021; 23:6051-6061. [PMID: 33683228 DOI: 10.1039/d0cp05151a] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
The structural changes of Fe3O4 nanoparticle electrodes in Li ion batteries during charging-discharging cycles have been investigated using in situ X-ray absorption spectroscopy (XAS). Chemometric methods viz., Principal Component Analysis (PCA) and Multivariate Curve Resolution-Alternate Least Square (MCR-ALS) have been used for analysis of the in situ XANES data during the charge-discharge cycle, which help to identify the various species formed during the lithiation-delithiation of Fe3O4. The concentration variation of the different species has also been determined and the detailed intercalation-conversion mechanism of the Fe3O4 electrodes during the first discharge has been established. Subsequently, the first charge and second discharge cycles were also studied to apprehend the difference in redox reaction between the first discharge and subsequent cycles. The above studies clearly identify the four species involved in the whole intercalation-conversion process of Fe3O4 electrode of a Li ion battery and also indicate the irreversibility of the conversion reaction in subsequent cycles which may be one of the reasons for capacity fading of these electrodes. The above results have also been corroborated with density functional theory (DFT)based ab inito calculations.
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Affiliation(s)
- C Nayak
- Atomic and Molecular Physics Division, Bhabha Atomic Research Centre, Trombay, Mumbai, India.
| | - N Abharana
- Atomic and Molecular Physics Division, Bhabha Atomic Research Centre, Trombay, Mumbai, India.
| | - B Modak
- Theoretical Chemistry Section, Bhabha Atomic Research Centre, Trombay, Mumbai, India
| | - K Halankar
- Chemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai, India
| | - S N Jha
- Atomic and Molecular Physics Division, Bhabha Atomic Research Centre, Trombay, Mumbai, India.
| | - D Bhattacharyya
- Atomic and Molecular Physics Division, Bhabha Atomic Research Centre, Trombay, Mumbai, India.
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Nilsson J, Winfree K, Molife C, Bhattacharyya D, D'Yachova Y, Wang X, Malmenäs M, Taipale K. P10.04 A Budget Impact Analysis for Treatment with Ramucirumab Plus Erlotinib in Metastatic EGFR-Mutated NSCLC in the US. J Thorac Oncol 2021. [DOI: 10.1016/j.jtho.2021.01.493] [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: 10/21/2022]
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Bandyopadhyay S, Banerjee J, Bhattacharyya D, Tudu R, Samanta I, Dandapat P, Nanda PK, Das AK, Mondal B, Batabyal S, Dutta TK. Companion Animals Emerged as an Important Reservoir of Carbapenem-Resistant Enterobacteriaceae: A Report from India. Curr Microbiol 2021; 78:1006-1016. [PMID: 33527166 DOI: 10.1007/s00284-021-02355-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2020] [Accepted: 01/10/2021] [Indexed: 10/22/2022]
Abstract
The emergence and spread of carbapenem-resistant Enterobacteriaceae (CRE) are perceived as a serious public-health threat world-wide. Despite sporadic reports, no systemic study has been carried out on CRE in companion animals in Indian subcontinent. In total, 237 canine specimens collected from five veterinary polyclinics in and around Kolkata were analyzed for isolation, antimicrobial resistance profiling and molecular characterization of carbapenem-resistant (CR) E. coli. Of the 29 CR isolates, 19 were identified as metallo-β-lactamase producers (MP-CRE) and 10 as metallo-β-lactamase non-producers (MNP-CRE). Eleven of them were extended spectrum β-lactamase and/or AmpC type β-lactamase producers and harboured fluoroquinolone-, tetracycline-, sulfonamide- and aminoglycoside-resistant genes. Beside uropathogenic virulence determinants, they carried the adhesion factors mediating biofilm production which was remarkably higher in 6 MP-CRE and one MNP-CRE isolates. Although the CRE were of diverse origin including the healthy and the diseased dogs, these were more frequently isolated from canine pyometra. The MP-CRE harboured plasmids of IncF and IncA/C types. Phylo-type B1 was observed in 38% of the CR isolates, followed by A0 in 31% and rest were attributed to A1 and D1. The Enterobacterial repetitive intergenic consensus-PCR (ERIC-PCR) revealed that these isolates were genetically diverse and constituted of a heterogenous population. Detection of CRE in pet dogs despite the fact that carbapenems are not used in animals in India emphasizes the need for active surveillance to identify the transmission and dynamics of such pathogens in companion animals.
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Affiliation(s)
- Samiran Bandyopadhyay
- ICAR-Indian Veterinary Research Institute, Eastern Regional Station, 37 Belgachia Road, Kolkata, 700 037, India.
| | - Jaydeep Banerjee
- ICAR-Indian Veterinary Research Institute, Eastern Regional Station, 37 Belgachia Road, Kolkata, 700 037, India
| | - Debaraj Bhattacharyya
- ICAR-Indian Veterinary Research Institute, Eastern Regional Station, 37 Belgachia Road, Kolkata, 700 037, India
| | - Rahul Tudu
- West Bengal University of Animal and Fishery Sciences, 37 & 68 K B Sarani, Kolkata, India
| | - Indranil Samanta
- West Bengal University of Animal and Fishery Sciences, 37 & 68 K B Sarani, Kolkata, India
| | - Premanshu Dandapat
- ICAR-Indian Veterinary Research Institute, Eastern Regional Station, 37 Belgachia Road, Kolkata, 700 037, India
| | - Pramod K Nanda
- ICAR-Indian Veterinary Research Institute, Eastern Regional Station, 37 Belgachia Road, Kolkata, 700 037, India
| | - Arun K Das
- ICAR-Indian Veterinary Research Institute, Eastern Regional Station, 37 Belgachia Road, Kolkata, 700 037, India
| | - Bimalendu Mondal
- ICAR-Indian Veterinary Research Institute, Eastern Regional Station, 37 Belgachia Road, Kolkata, 700 037, India
| | - Subhasis Batabyal
- West Bengal University of Animal and Fishery Sciences, 37 & 68 K B Sarani, Kolkata, India
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18
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Banerjee D, Dey CC, Kumar R, Sewak R, Jha SN, Bhattacharyya D, Acharya R, Pujari PK. Probing the solute-drag effect and its role in stabilizing the orthorhombic phase in bulk La-doped HfO 2 by X-ray and gamma ray spectroscopy. Phys Chem Chem Phys 2021; 23:16258-16267. [PMID: 34309608 DOI: 10.1039/d1cp00096a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
The recent observation of ferroelectricity in ultra thin films of hafnium oxide (HfO2) has been attributed to the orthorhombic (o) phase of HfO2 with space group Pca21. Although this oxide is polymorphic in nature, this polar o-phase is known to be stabilized in the doped thin film oxide. The objective of the present experiment is to stabilize the o-phases in La doped bulk polycrystalline HfO2 and investigate their evolution with the doping concentration through Time Differential Perturbed Angular Correlation (TDPAC), X-ray Absorption Near Edge Structure (XANES) and Extended X-ray Absorption Fine Structure (EXAFS) measurements. The present work reports the presence of both the polar Pca21 phase and the antipolar Pbca phase at different La-concentrations. Two o-phases of HfO2 with space groups Pca21 and Pbca, difficult to distinguish by other complimentary methods, could be unambiguously identified by utilizing the atomic scale sensitivity of the electric field gradient (EFG) embedded in TDPAC spectroscopy. The determination of the oxidation state and the local environment of La-atoms by XANES and EXAFS measurements illuminates the microscopic role of the dopant in stabilizing the o-phase. The "solute drag model" proposes a critical crystallite size for the nucleation of the o-phase in bulk HfO2 and explains the role of the La-dopant in stabilizing the o-phase. Thus the present study shows the possibility of stabilizing the polar o-phase and hence attaining ferroelectricity in bulk HfO2 to augment the scope of future application for this ferroelectric device.
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Affiliation(s)
- D Banerjee
- Radiochemistry Laboratory, RCD (BARC), Variable Energy Cyclotron Centre, 1/AF Bidhannagar, Kolkata 700064, India.
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George J, Bhattacharyya D. Biocarbon reinforced polypropylene composite: An investigation of mechanical and filler behavior through advanced dynamic atomic force microscopy and X-ray micro CT. EXPRESS POLYM LETT 2021. [DOI: 10.3144/expresspolymlett.2021.20] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
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20
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Sarkar P, Biswas A, Abharana N, Rai S, Modi MH, Bhattacharyya D. Interface modification of Cr/Ti multilayers with C barrier layer for enhanced reflectivity in the water window regime. J Synchrotron Radiat 2021; 28:224-230. [PMID: 33399572 DOI: 10.1107/s1600577520013429] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/08/2020] [Accepted: 10/07/2020] [Indexed: 06/12/2023]
Abstract
The influence of a carbon barrier layer to improve the reflectivity of Cr/Ti multilayers, intended to be used in the water window wavelength regime, is investigated. Specular grazing-incidence X-ray reflectivity results of Cr/Ti multilayers with 10 bilayers show that interface widths are reduced to ∼0.24 nm upon introduction of a ∼0.3 nm C barrier layer at each Cr-on-Ti interface. As the number of bilayers increases to 75, a multilayer with C barrier layers maintains almost the same interface widths with no cumulative increase in interface imperfections. Using such interface-engineered Cr/C/Ti multilayers, a remarkably high soft X-ray reflectivity of ∼31.6% is achieved at a wavelength of 2.77 nm and at a grazing angle of incidence of 16.2°, which is the highest reflectivity reported so far in the literature in this wavelength regime. Further investigation of the multilayers by diffused grazing-incidence X-ray reflectivity and grazing-incidence extended X-ray absorption fine-structure measurements using synchrotron radiation suggests that the improvement in interface microstructure can be attributed to significant suppression of inter-diffusion at Cr/Ti interfaces by the introduction of C barrier layers and also due to the smoothing effect of the C layer promoting two-dimensional growth of the multilayer.
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Affiliation(s)
- P Sarkar
- Atomic and Molecular Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, India
| | - A Biswas
- Atomic and Molecular Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, India
| | - N Abharana
- Atomic and Molecular Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, India
| | - S Rai
- Synchrotron Utilisation Section, Raja Ramnna Centre for Advanced Technology, Indore 752013, India
| | - M H Modi
- Synchrotron Utilisation Section, Raja Ramnna Centre for Advanced Technology, Indore 752013, India
| | - D Bhattacharyya
- Atomic and Molecular Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, India
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21
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Singh GN, Bhattacharyya D, Bandyopadhyay A. A general class of calibration estimators under stratified random sampling in presence of various kinds of non-sampling errors. COMMUN STAT-SIMUL C 2020. [DOI: 10.1080/03610918.2020.1855447] [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: 10/22/2022]
Affiliation(s)
- G. N. Singh
- Department of Mathematics & Computing, Indian Institute of Technology (Indian School of Mines), Dhanbad, Jharkhand, India
| | - D. Bhattacharyya
- Department of Mathematics & Computing, Indian Institute of Technology (Indian School of Mines), Dhanbad, Jharkhand, India
| | - A. Bandyopadhyay
- Department of Mathematics, Asansol Engineering College, Asansol, West Bengal, India
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22
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Singh GN, Bhattacharyya D, Bandyopadhyay A. Some logarithmic and sine-type imputation techniques for missing data in survey sampling in the presence of measurement errors. J STAT COMPUT SIM 2020. [DOI: 10.1080/00949655.2020.1828414] [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: 10/23/2022]
Affiliation(s)
- G. N. Singh
- Department of Mathematics & Computing, Indian Institute of Technology (Indian School of Mines), Dhanbad, India
| | - D. Bhattacharyya
- Department of Mathematics & Computing, Indian Institute of Technology (Indian School of Mines), Dhanbad, India
| | - A. Bandyopadhyay
- Department of Mathematics, Asansol Engineering College, Asansol, India
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Bhattacharyya D, Pavithran T. PUK7 Budget Impact Of A New Mobile Application Reimbursement Strategy For Diabetic Patients In Andhra Pradesh (India). Value Health Reg Issues 2020. [DOI: 10.1016/j.vhri.2020.07.568] [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: 10/23/2022]
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Tuly I, Bhattacharyya D, Shafique S, Hossain SH, Anwar I. Gender disparity in the physicians in public sector in Bangladesh: a mixed-method exploratory study. Eur J Public Health 2020. [DOI: 10.1093/eurpub/ckaa166.526] [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: 11/14/2022] Open
Abstract
Abstract
Background
Gender equality is needed in health service delivery systems to support universal health coverage (UHC). Women are reluctant to visit male doctors for medical problems. However, number of female doctors is inadequate in many low and middle income countries (LMICs) which is a challenge for establishing gender-sensitive health system. We explored the production and distribution of female physicians in the public sector in Bangladesh to support policy for actions.
Methodology
This is a mixed-method exploratory study using documentary review; Key Informant Interviews and secondary data analysis. Multiple stakeholder consultations and a policy dialogue were organized to validate the study findings.
Results
An increasing trend of female medical students was observed since 2011 in admission. In 2018, out of total 5528 students enrolled, 54% were female whereas 46% were male. However, fewer female doctors were enrolled in the public service compared to their male peers. The male-female ratio was almost 2:1 in the public sector. Out of 471 sub-district health managers, 52 were female; out of 64 district health mangers only one was female; and out of 8 Division Directors only one was female. Female doctors reported to face practical problems in rural settings with regard to housing, safety and security. There is no provision of deploying married couples at the same or nearby health facilities. All these compelled female doctors to quit rural posting or even the government service. Moreover, female physicians prefer certain specialties such as obstetrics and gynaecology, medicine and certain basic subjects which may create more gender imbalance in service delivery system.
Conclusions
In adequate number of female physicians in public sector and their retention in rural areas is a major concern for the health systems in Bangladesh. Policy attention is needed to take necessary steps to make gender-responsive health systems to improve health service to achieve UHC.
Key messages
Poor presence of female physicians in deployed doctors in public sector in Bangladesh creates problems in health service delivery and is becoming a major concern for the health systems in Bangladesh. Policy needs to take remedial measures to make women-friendly working environment in the public sector hospitals in Bangladesh to provide health service delivery for all leaving no one behind.
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Affiliation(s)
- I Tuly
- Health Systems and Population Studies Division, icddr,b, Dhaka, Bangladesh
| | - D Bhattacharyya
- Health Systems and Population Studies Division, icddr,b, Dhaka, Bangladesh
| | - S Shafique
- Health Systems and Population Studies Division, icddr,b, Dhaka, Bangladesh
| | - S h Hossain
- Health Systems and Population Studies Division, icddr,b, Dhaka, Bangladesh
| | - I Anwar
- Health Systems and Population Studies Division, icddr,b, Dhaka, Bangladesh
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Pahan S, Sengupta A, Yadav AK, Jha SN, Bhattacharyya D, Musharaf Ali S, Khan PN, Debnath AK, Banerjee D, Vincent T, Manohar S, Kaushik CP. Exploring functionalized titania for task specific application of efficient separation of trivalent f-block elements. NEW J CHEM 2020. [DOI: 10.1039/d0nj01014f] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Functionalized titania, obtained by grafting the dipicolinic acid functionality, was explored for task specific application of highly efficient separation of trivalent f-block elements.
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Affiliation(s)
- Sumit Pahan
- Process Development Division
- Bhabha Atomic Research Centre
- India
- Homi Bhabha National Institute
- India
| | - Arijit Sengupta
- Homi Bhabha National Institute
- India
- Radiochemistry Division
- Bhabha Atomic Research Centre
- India
| | - A. K. Yadav
- Atomic and Molecular Physics Division
- Bhabha Atomic Research Centre
- India
| | - S. N. Jha
- Atomic and Molecular Physics Division
- Bhabha Atomic Research Centre
- India
| | - D. Bhattacharyya
- Atomic and Molecular Physics Division
- Bhabha Atomic Research Centre
- India
| | | | - P. N. Khan
- Process Development Division
- Bhabha Atomic Research Centre
- India
| | - A. K. Debnath
- Technical Physics Division
- Bhabha Atomic Research Centre
- India
| | - D. Banerjee
- Process Development Division
- Bhabha Atomic Research Centre
- India
| | - T. Vincent
- Process Development Division
- Bhabha Atomic Research Centre
- India
| | - S. Manohar
- Process Development Division
- Bhabha Atomic Research Centre
- India
| | - C. P. Kaushik
- Homi Bhabha National Institute
- India
- Nuclear Recycle Group
- Bhabha Atomic Research Centre
- India
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Marwah V, Bhattacharyya D, Ali M, Rajput A, Sengupta P, Bhati G. Diagnostic utility of medical thoracoscopy in undiagnosed exudative pleural effusions. Med J DY Patil Vidyapeeth 2020. [DOI: 10.4103/mjdrdypu.mjdrdypu_277_19] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
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Abstract
The formation of O-vacancies along with their local environment and locus of formation for the O-vacancies has been understood using EXAFS and ab initio techniques in a doped (Zn2+) anatase lattice.
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Affiliation(s)
- Kaustava Bhattacharyya
- Chemistry Division
- Bhabha Atomic Research Centre
- Mumbai-40085
- India
- Homi Bhabha National Institute
| | - B. Modak
- Theoretical Chemistry Section
- Bhabha Atomic Research Centre
- Mumbai-40085
- India
| | - C. Nayak
- Atomic & Molecular Physics Division
- Bhabha Atomic Research Centre
- Mumbai-400 085
- India
| | - R. G. Nair
- Chemistry Division
- Bhabha Atomic Research Centre
- Mumbai-40085
- India
| | - D. Bhattacharyya
- Homi Bhabha National Institute
- Anushaktinagar
- Mumbai-400094
- India
- Atomic & Molecular Physics Division
| | - S. N. Jha
- Homi Bhabha National Institute
- Anushaktinagar
- Mumbai-400094
- India
- Atomic & Molecular Physics Division
| | - A. K. Tripathi
- Chemistry Division
- Bhabha Atomic Research Centre
- Mumbai-40085
- India
- Homi Bhabha National Institute
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Kalita P, Saini S, Rajput P, Jha SN, Bhattacharyya D, Ojha S, Avasthi DK, Bhattacharya S, Ghosh S. Oxygen vacancy mediated cubic phase stabilization at room temperature in pure nano-crystalline zirconia films: a combined experimental and first-principles based investigation. Phys Chem Chem Phys 2019; 21:22482-22490. [PMID: 31588473 DOI: 10.1039/c9cp02121c] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We report here the stabilization of the cubic phase under ambient conditions in the thin films of zirconia synthesized by electron beam evaporation. The cubic phase stabilization was achieved without the use of chemical stabilizers and/or concurrent ion beam bombardment. Films of two different thicknesses (660 nm and 140 nm) were deposited. While the 660 nm as-deposited films were in the cubic phase, as indicated by X-ray diffraction and Raman spectroscopy, the 140 nm as-deposited films were amorphous and the transformation to the cubic phase was obtained after thermal annealing. Extended X-ray absorption fine structure measurements revealed the existence of oxygen vacancies in the local structure surrounding zirconium for all films. However, the amount of these oxygen vacancies was found to be significantly higher for the amorphous films as compared to that for the films in the cubic phase (660 nm as-deposited and 140 nm annealed films). The stabilization of the cubic phase is attributed to the breaking of the oxygen-zirconium bonds due to the presence of the oxygen vacancies, which results in the suppression of the soft X2- mode of vibration of the oxygen sub-lattice. Our first-principles modeling under the framework of density functional theory shows that the cubic structure with oxygen vacancies is indeed more stable under ambient conditions than its pristine (without vacancies) counterpart due to breaking of the oxygen bonds. The requirement of a critical amount of these vacancies for cubic phase stabilization is discussed.
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Affiliation(s)
- Parswajit Kalita
- Department of Physics, Indian Institute of Technology Delhi, New Delhi - 110016, India.
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Bhattacharyya D, Ghosh R, Gupta P, Gupta A, Roychoudhury S, Nath S. Incidence of imatinib resistance in chronic myeloid leukemia (CML) patients: Experience from resource poor center of eastern India. Ann Oncol 2019. [DOI: 10.1093/annonc/mdz251.033] [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: 11/12/2022] Open
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Singh GN, Bhattacharyya D, Bandyopadhyay A. Formulation of logarithmic type estimators to estimate population mean in successive sampling in presence of random non response and measurement errors. COMMUN STAT-SIMUL C 2019. [DOI: 10.1080/03610918.2019.1659364] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Affiliation(s)
- G. N. Singh
- Department of Applied Mathematics, Indian Institute of Technology (Indian School of Mines), Dhanbad, Jharkhand, India
| | - D. Bhattacharyya
- Department of Applied Mathematics, Indian Institute of Technology (Indian School of Mines), Dhanbad, Jharkhand, India
| | - A. Bandyopadhyay
- Department of Mathematics, Asansol Engineering College, Asansol, India
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Damaraju M, Yoshihara H, Bhattacharyya D, Panda TK, Kurilla KK. Phosphorus recovery from the sludge generated from a continuous bipolar mode electrocoagulation (CBME) system. Water Sci Technol 2019; 79:1348-1356. [PMID: 31123234 DOI: 10.2166/wst.2019.131] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Phosphorus is known to be a limited non-renewable resource. Phosphorus is obtained from phosphate rock, which is likely to be depleted in the next few decades. Therefore, it is very important to find alternate sources of phosphorus from which phosphorus can be recycled and recovered. This study focuses on the recovery of phosphorus from the sludge generated from a continuous bipolar mode electrocoagulation (CBME) system, used for treating a palm oil mill effluent (POME). The sludge generated from the CBME system is leached with oxalic acid and sulphuric acid for phosphorus recovery with and without thermal treatment. Acid leaching was carried out at various time intervals using various liquid/solid (L/S) ratios of acids and sludge. The CBME system caused a 73% removal of phosphorus from POME, where phosphorus is precipitated in sludge as iron phosphates or adsorbed as phosphates depending on the pH in the system. Acid leaching resulted in nearly 85% recovery of phosphorus with both sulphuric acid and oxalic acid for sludge combusted at 900 °C. Statistical analysis was carried out to find the significance of the operational conditions on the phosphorus yield. Acid leaching results in the formation of orthophosphates, which can be used as a raw material for synthesis of chemical fertilizers.
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Affiliation(s)
- M Damaraju
- Department of Civil Engineering, Indian Institute of Technology-Hyderabad, Telangana, 502285, India E-mail:
| | - H Yoshihara
- Division of Environmental Engineering, Hokkaido University, Sapporo, 060-0808, Japan
| | - D Bhattacharyya
- Department of Civil Engineering, Indian Institute of Technology-Hyderabad, Telangana, 502285, India E-mail:
| | - T K Panda
- Department of Chemistry, Indian Institute of Technology Hyderabad, Telangana, 502285, India
| | - K K Kurilla
- Rahyals Envergy India Pvt Ltd, Kukatpally, Hyderabad, Telangana, 500085, India
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32
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Patra N, Sachan UGPS, SundarRajan S, Malhotra S, Harad V, Agarwal A, Divedi A, Jha SN, Bhattacharyya D. First results from the XMCD facility at the Energy-Dispersive EXAFS beamline of the Indus-2 synchrotron source. J Synchrotron Radiat 2019; 26:445-449. [PMID: 30855254 DOI: 10.1107/s1600577519000602] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/05/2018] [Accepted: 01/11/2019] [Indexed: 06/09/2023]
Abstract
Setting up of the X-ray Magnetic Circular Dichroism (XMCD) measurement facility with hard X-rays at the Energy-Dispersive EXAFS beamline (BL-08) at the Indus-2 synchrotron source is reported. This includes the design and development of a water-cooled electromagnet having a highest magnetic field of 2 T in a good field volume of 125 mm3 and having a 10 mm hole throughout for passage of the synchrotron beam. This also includes the development of an (X-Z-θ) motion stage for the heavy electromagnet for aligning its axis and the beam hole along the synchrotron beam direction. Along with the above developments, also reported is the first XMCD signal measured on a thick Gd film in the above set-up which shows good agreement with the reported results. This is the first facility to carry out XMCD measurement with hard X-rays in India.
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Affiliation(s)
- N Patra
- Atomic and Molecular Physics Division, Bhabha Atomic Research Centre, Mumbai 400 085, India
| | - U G P S Sachan
- Accelerator Control Division, Bhabha Atomic Research Centre, Mumbai 400 085, India
| | - S SundarRajan
- Accelerator Control Division, Bhabha Atomic Research Centre, Mumbai 400 085, India
| | - Sanjay Malhotra
- Accelerator Control Division, Bhabha Atomic Research Centre, Mumbai 400 085, India
| | - Vijay Harad
- Accelerator Control Division, Bhabha Atomic Research Centre, Mumbai 400 085, India
| | - Ankur Agarwal
- Atomic and Molecular Physics Division, Bhabha Atomic Research Centre, Mumbai 400 085, India
| | - Ashutosh Divedi
- Atomic and Molecular Physics Division, Bhabha Atomic Research Centre, Mumbai 400 085, India
| | - S N Jha
- Atomic and Molecular Physics Division, Bhabha Atomic Research Centre, Mumbai 400 085, India
| | - D Bhattacharyya
- Atomic and Molecular Physics Division, Bhabha Atomic Research Centre, Mumbai 400 085, India
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Rawat N, Kar A, Bhattacharyya A, Yadav AK, Bhattacharyya D, Jha SN, Kumar P, Nayak SK, Tomar BS. Complexation of U(VI) with Cucurbit[5]uril: Thermodynamic and Structural investigation in aqueous medium. Spectrochim Acta A Mol Biomol Spectrosc 2019; 207:354-362. [PMID: 30292112 DOI: 10.1016/j.saa.2018.09.037] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/11/2018] [Revised: 09/17/2018] [Accepted: 09/18/2018] [Indexed: 06/08/2023]
Abstract
The assessment of cucurbituril (CBn) for selective removal of actinides from nuclear waste streams requires comprehensive understanding of binding parameters and coordination of these complexes. The present work is the first experimental report on complexation of actinide ion with Cucurbit[5]uril (CB5) in solution. The thermodynamic parameters (ΔG, ΔH and ΔS) for complexation of CB5 with U(VI) in formic acid water medium were determined using microcalorimetry and UV-Vis spectroscopy. The enthalpy and entropy of complexation revealed the partial binding of U(VI) to CB5 portal. The partial binding was confirmed by spectroscopic techniques viz. extended X absorption fine structure spectroscopy (EXAFS), 1H and 13C NMR. The EXAFS χ(r) versus r spectra for U-CB5 complex has been fitted from 1.4 to 3.5 Å with two oxygen shells and a carbon shell. The presence of three carbon atom in secondary shell shows the involvement of only three carbonyl oxygens directly bonding to U(VI) which is in contrast to that calculated from gas phase DFT calculation of unhydrated system. The combined effect of hydration and formic acid encapsulation led to the enhanced stability of partially bound U(VI) to CB5. In the present work the binding of formic acid has also been studied by fluorescence spectroscopy. ESI-MS data shows the unusual stabilization of U(VI) by CB5 in gas phase.
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Affiliation(s)
- Neetika Rawat
- Radioanalytical Chemistry Division, Trombay, Mumbai 400085, India; Homi Bhabha National Institute, Mumbai 400094, India.
| | - Aishwarya Kar
- Radioanalytical Chemistry Division, Trombay, Mumbai 400085, India
| | - A Bhattacharyya
- Radiochemistry Division, Trombay, Mumbai 400085, India; Homi Bhabha National Institute, Mumbai 400094, India
| | - A K Yadav
- Atomic and Molecular Physics Division, Trombay, Mumbai 400085, India
| | - D Bhattacharyya
- Atomic and Molecular Physics Division, Trombay, Mumbai 400085, India; Homi Bhabha National Institute, Mumbai 400094, India
| | - S N Jha
- Atomic and Molecular Physics Division, Trombay, Mumbai 400085, India
| | - P Kumar
- Fuel Chemistry Division, Trombay, Mumbai 400085, India
| | - S K Nayak
- Bioorganic Chemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400085, India; Homi Bhabha National Institute, Mumbai 400094, India
| | - B S Tomar
- Homi Bhabha National Institute, Mumbai 400094, India
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Gawai UP, Gaikwad DK, Bodke MR, Khawal HA, Pandey KK, Yadav AK, Jha SN, Bhattacharyya D, Dole BN. Doping effect on the local structure of metamagnetic Co doped Ni/NiO:GO core–shell nanoparticles using X-ray absorption spectroscopy and the pair distribution function. Phys Chem Chem Phys 2019; 21:1294-1307. [DOI: 10.1039/c8cp05267k] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Core–shell nanoparticles of Co doped Ni/NiO and incorporated GO sheets evidenced that the metamagnetic behavior at 5 K to 300 K temperatures.
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Affiliation(s)
- U. P. Gawai
- Department of Physics
- YCSPM's
- DDSP
- Arts Commerce and Science College
- Dist- Jalgaon-425109
| | - D. K. Gaikwad
- Department of Physics
- Dr. Babasaheb Ambedkar Marathwada University
- Aurangabad – 431004
- India
| | - M. R. Bodke
- Department of Electronics
- Modern College of Arts
- Commerce and Science
- Pune-5
- India
| | - H. A. Khawal
- Advanced Materials Research Laboratory
- Department of Physics
- Dr Babasaheb Ambedkar Marathwada University
- Auranagabad-431004
- India
| | - K. K. Pandey
- High Pressure & Synchrotron Radiation Physics Division
- Bhabha Atomic Research Centre
- Mumbai
- India
| | - A. K. Yadav
- Atomic & Molecular Physics Division
- Bhabha Atomic Research Centre
- Mumbai – 400 094
- India
| | - S. N. Jha
- Atomic & Molecular Physics Division
- Bhabha Atomic Research Centre
- Mumbai – 400 094
- India
| | - D. Bhattacharyya
- Atomic & Molecular Physics Division
- Bhabha Atomic Research Centre
- Mumbai – 400 094
- India
| | - B. N. Dole
- Advanced Materials Research Laboratory
- Department of Physics
- Dr Babasaheb Ambedkar Marathwada University
- Auranagabad-431004
- India
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35
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Nayak C, Jain P, Vinod CP, Jha SN, Bhattacharyya D. Operando X-ray absorption spectroscopy study of the Fischer-Tropsch reaction with a Co catalyst. J Synchrotron Radiat 2019; 26:137-144. [PMID: 30655478 DOI: 10.1107/s1600577518015588] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/01/2018] [Accepted: 11/03/2018] [Indexed: 06/09/2023]
Abstract
This article describes the setting up of a facility on the energy-scanning EXAFS beamline (BL-09) at RRCAT, Indore, India, for operando studies of structure-activity correlation during a catalytic reaction. The setup was tested by operando X-ray absorption spectroscopy (XAS) studies performed on a Co-based catalyst during the Fischer-Tropsch reaction to obtain information regarding structural changes in the catalyst during the reaction. Simultaneous gas chromatography (GC) measurements during the reaction facilitate monitoring of the product gases, which in turn gives information regarding the activity of the catalyst. The combination of XAS and GC techniques was used to correlate the structural changes with the activity of the catalyst at different reaction temperatures. The oxide catalyst was reduced to the metallic phase by heating at 400°C for 5 h under H2 at ambient pressure and subsequently the catalytic reaction was studied at four different temperatures of 240, 260, 280 and 320°C. The catalyst was studied for 10 h at 320°C and an attempt has been made to understand the process of its deactivation from the XANES and EXAFS results.
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Affiliation(s)
- Chandrani Nayak
- Atomic and Molecular Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, India
| | - Preeti Jain
- Catalysis and Inorganic Chemistry Division, CSIR - National Chemical Laboratory, Dr Homi Bhabha Road, Pune 411008, India
| | - C P Vinod
- Catalysis and Inorganic Chemistry Division, CSIR - National Chemical Laboratory, Dr Homi Bhabha Road, Pune 411008, India
| | - S N Jha
- Atomic and Molecular Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, India
| | - D Bhattacharyya
- Atomic and Molecular Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, India
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36
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Sahoo M, Yadav AK, Ghosh S, Jha SN, Bhattacharyya D, Mathews T. Structural studies of spray pyrolysis synthesized oxygen deficient anatase TiO2 thin films by using X-ray absorption spectroscopy. Phys Chem Chem Phys 2019; 21:6198-6206. [DOI: 10.1039/c8cp06811a] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
The present work focuses on synthesis and X-ray absorption studies of single phase oxygen deficient anatase TiO2 thin films.
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Affiliation(s)
- Madhusmita Sahoo
- Surface and Nanoscience Division
- Materials Science Group
- IGCAR
- HBNI
- Kalpakkam
| | - A. K. Yadav
- Atomic and Molecular Physics Division
- BARC
- Mumbai
- India
| | - Subrata Ghosh
- Surface and Nanoscience Division
- Materials Science Group
- IGCAR
- HBNI
- Kalpakkam
| | - S. N. Jha
- Atomic and Molecular Physics Division
- BARC
- Mumbai
- India
| | | | - Tom Mathews
- Surface and Nanoscience Division
- Materials Science Group
- IGCAR
- HBNI
- Kalpakkam
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Malhari AA, Bhattacharyya D, Arya K, Chatterjee T, Pal M. Assessment of vibration exposure and physiological responses of crew members during Infantry Combat Vehicle (ICV) operation: a pilot study. J ROY ARMY MED CORPS 2018; 165:152-158. [PMID: 30317216 DOI: 10.1136/jramc-2018-001022] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2018] [Accepted: 08/06/2018] [Indexed: 11/03/2022]
Abstract
BACKGROUND Operation of infantry combat vehicle (ICV) influences the cardiorespiratory responses as well as the risk of vibration exposure on the crew members which adversely affect their performance and health. AIM To assess the effect of stress factors, that is, ICV's compartmental temperature, relative humidity (RH) and vehicular vibration on the physiological parameters (heart rate (HR), respiratory frequency (RF), estimated core body temperature (ECT)) of the crew members during the ICV operation. METHODS A 1 hour run trial of the ICV operation was conducted with its crew members at their respective positions. Compartmental temperature and RH were monitored at an interval of every 15 min during the run trial. Physiological parameters were monitored continuously during the run trial. Whole body vibration (WBV) and hand-arm vibration (HAV) of the crew members were also measured during the run trial time. RESULTS The findings showed a strong positive correlation (p<0.05) between the increasing compartmental temperature and RH with its run trial time. Significant changes were observed in the physiological parameters (p<0.05) along with the increasing run trial time. Additionally, the physiological parameters showed a strong positive correlation with compartmental temperature and RH, respectively (p<0.05). Also, a significant increase (p<0.05) in the muscle strength was recorded after their exposure to ICV operation. The study also confirmed high level of WBV exposure of the crew members during the ICV operation. CONCLUSION Increase in HR, RF and ECT along with increase in temperature and RH is a predictive indicator of physiological stress. Moreover, high levels of vibration exposure of various operations may bring deleterious effect on soldiers' health as well as their performance. Proper ergonomic intervention can reduce exposure to vibration, physiological stress and increase comfort which may ultimately ensure an optimum performance of soldiers and successful completion of mission.
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Affiliation(s)
- Archana A Malhari
- Defence Institute of Physiology and Allied Sciences, Defence Research and Development Organisation, Lucknow Road, Delhi-110054, India
| | - D Bhattacharyya
- Defence Institute of Physiology and Allied Sciences, Defence Research and Development Organisation, Lucknow Road, Delhi-110054, India
| | - K Arya
- Defence Institute of Physiology and Allied Sciences, Defence Research and Development Organisation, Lucknow Road, Delhi-110054, India
| | - T Chatterjee
- Defence Institute of Physiology and Allied Sciences, Defence Research and Development Organisation, Lucknow Road, Delhi-110054, India
| | - M Pal
- Defence Institute of Physiology and Allied Sciences, Defence Research and Development Organisation, Lucknow Road, Delhi-110054, India
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Wang H, Swann R, Thomas E, Innes HA, Valerio H, Hayes PC, Allen S, Barclay ST, Wilks D, Fox R, Bhattacharyya D, Kennedy N, Morris J, Fraser A, Stanley AJ, Gunson R, Mclntyre PG, Hunt A, Hutchinson SJ, Mills PR, Dillon JF. Impact of previous hepatitis B infection on the clinical outcomes from chronic hepatitis C? A population-level analysis. J Viral Hepat 2018; 25:930-938. [PMID: 29577515 DOI: 10.1111/jvh.12897] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/07/2017] [Accepted: 02/11/2018] [Indexed: 12/13/2022]
Abstract
Chronic coinfection with hepatitis C virus (HCV) and hepatitis B virus (HBV) is associated with adverse liver outcomes. The clinical impact of previous HBV infection on liver disease in HCV infection is unknown. We aimed at determining any association of previous HBV infection with liver outcomes using antibodies to the hepatitis B core antigen (HBcAb) positivity as a marker of exposure. The Scottish Hepatitis C Clinical Database containing data for all patients attending HCV clinics in participating health boards was linked to the HBV diagnostic registry and mortality data from Information Services Division, Scotland. Survival analyses with competing risks were constructed for time from the first appointment to decompensated cirrhosis, hepatocellular carcinoma (HCC) and liver-related mortality. Records of 8513 chronic HCV patients were included in the analyses (87 HBcAb positive and HBV surface antigen [HBsAg] positive, 1577 HBcAb positive and HBsAg negative, and 6849 HBcAb negative). Multivariate cause-specific proportional hazards models showed previous HBV infection (HBcAb positive and HBsAg negative) significantly increased the risks of decompensated cirrhosis (hazard ratio [HR]: 1.29, 95% CI: 1.01-1.65) and HCC (HR: 1.64, 95% CI: 1.09-2.49), but not liver-related death (HR: 1.02, 95% CI: 0.80-1.30). This is the largest study to date showing an association between previous HBV infection and certain adverse liver outcomes in HCV infection. Our analyses add significantly to evidence which suggests that HBV infection adversely affects liver health despite apparent clearance. This has important implications for HBV vaccination policy and indications for prioritization of HCV therapy.
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Affiliation(s)
- H Wang
- Dundee Epidemiology and Biostatistics Unit, Population Health Sciences, University of Dundee, Dundee, UK
| | - R Swann
- Department of Gastroenterology, Gartnavel General Hospital, NHS Greater Glasgow and Clyde, Glasgow, UK
| | - E Thomas
- Department of Medicine for the Elderly, North Middlesex Hospital, London, UK
| | - H A Innes
- School of Health and Life Sciences, Glasgow Caledonian University, Glasgow, UK.,Health Protection Scotland, Glasgow, UK
| | - H Valerio
- School of Health and Life Sciences, Glasgow Caledonian University, Glasgow, UK.,Health Protection Scotland, Glasgow, UK
| | - P C Hayes
- Liver Transplant Unit, Royal Infirmary Edinburgh, Edinburgh, UK
| | - S Allen
- Department of Infectious Diseases, University Hospital Crosshouse, Kilmarnock, UK
| | - S T Barclay
- Department of Gastroenterology, Glasgow Royal Infirmary, Glasgow, UK
| | - D Wilks
- Department of Infectious Diseases, Western General Hospital, Edinburgh, UK
| | - R Fox
- The Brownlee Centre, Glasgow, UK
| | | | | | - J Morris
- Department of Gastroenterology, Queen Elizabeth University Hospital, Glasgow, UK
| | - A Fraser
- Aberdeen Royal Infirmary, Aberdeen, UK
| | - A J Stanley
- Department of Gastroenterology, Glasgow Royal Infirmary, Glasgow, UK
| | - R Gunson
- West of Scotland Virology Centre, Glasgow Royal Infirmary, Glasgow, UK
| | - P G Mclntyre
- Department of Microbiology, Ninewells Hospital and Medical School, Dundee, UK
| | - A Hunt
- Department of Virology, Aberdeen Royal Infirmary, Aberdeen, UK
| | - S J Hutchinson
- School of Health and Life Sciences, Glasgow Caledonian University, Glasgow, UK.,Health Protection Scotland, Glasgow, UK
| | - P R Mills
- Department of Gastroenterology, Gartnavel General Hospital, NHS Greater Glasgow and Clyde, Glasgow, UK
| | - J F Dillon
- Division of Molecular and Clinical Medicine, Ninewells Hospital and Medical School, Dundee, UK
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Abstract
Selective separation of small molecules by membranes is inhibited by the performance gap between nanofiltration and ultrafiltration membranes. In this work, a membrane that can efficiently remove small molecules (> 300 Da) was created by incorporating graphene oxide quantum dots (GQDs) into a cellulose membrane using an ionic liquid (1-ethyl-3-methylimidazolium acetate). Incorporation of GQD into cellulose membranes using an ionic liquid brings several advantages over traditional mixed matrix membranes: 1) GQDs are abundant in peripheral hydroxyl and carboxyl groups, thus GQDs have strong binding with cellulose through hydrogen bonding and forms a stable composite membrane. 2) Negative surface charge of GQDs helps prevent aggregation. 3) The size (5 nm) of GQD is smaller than most nanoparticles used in membranes, allowing for interesting pore forming properties. GQD-cellulose membranes were prepared by non-solvent induced phase separation in water. It was determined that about 45% of GQDs are incorporated from solution to membrane. GQDs were determined to be located on the membrane surface, giving the membrane negative surface charge and improved hydrophilicity. GQDs showed no leaching after convective flow through the membrane. Impact of GQD on membrane permeability and rejection was studied through convective flow experiments, and through longer term permeability studies.
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Affiliation(s)
- A Colburn
- Department of Chemical and Materials Engineering, 177F. Paul Anderson Tower, University of Kentucky, Lexington, KY 40506, USA
| | - N Wanninayake
- Department of Chemistry, University of Kentucky, Lexington, KY 40506, USA
| | - D Y Kim
- Department of Chemistry, University of Kentucky, Lexington, KY 40506, USA
| | - D Bhattacharyya
- Department of Chemical and Materials Engineering, 177F. Paul Anderson Tower, University of Kentucky, Lexington, KY 40506, USA
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Bandyopadhyay S, Banerjee J, Bhattacharyya D, Samanta I, Mahanti A, Dutta TK, Ghosh S, Nanda PK, Dandapat P, Bandyopadhyay S. Genomic Identity of Fluoroquinolone-Resistant blaCTX-M-15-Type ESBL and pMAmpC β-Lactamase Producing Klebsiella pneumoniae from Buffalo Milk, India. Microb Drug Resist 2018; 24:1345-1353. [PMID: 29565231 DOI: 10.1089/mdr.2017.0368] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022] Open
Abstract
We investigated the occurrence of extended-spectrum β-lactamase (ESBL) and AmpC-type β-lactamase (ACBL) producing quinolone-resistant Klebsiella pneumoniae (KP) in milk samples of apparently healthy buffaloes (n = 348) and buffaloes (n = 19) with evidence of subclinical mastitis from seven districts of West Bengal, India. In total, 12 ESBL producing KP were isolated with blaCTX-M-15 gene and 7 of them were ACBL producers, as well. The blaCTX-M-15 genes were carried by transposable element ISEcp1. The plasmid-mediated quinolone resistance genes-qnrS, qnrA, qnrB, qepA, and aac(6')-Ib-cr were detected in five, one, three, four, and one isolate (s), respectively. In addition, eight isolates carried mutation in gyrase (gyrA) and six in topoisomerase IV (parC). Resistance markers/genes for sulfonamide (sul1), tetracycline [tet(A) and tet(B)], and aminoglycoside (aacC2) were also detected in eight, four, and one isolate(s), respectively. The class I integrons identified in five isolates carried aad2/aad5 and dfrA12/dfrA17 gene cassettes. The enterobacterial repetitive intergenic consensus-PCR revealed that all the isolates were genetically diverse and comprised a heterogeneous population. Isolation of multidrug-resistant KP, a typical nosocomial pathogen from buffalo milk, reiterates the need to monitor farm animals for ESBL producing Enterobacteriaceae and emphasizes on judicious use of antibiotics in animal husbandry sector.
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Affiliation(s)
| | - Jaydeep Banerjee
- 1 ICAR-Indian Veterinary Research Institute , ERS, Kolkata, India
| | | | | | | | - Tapan K Dutta
- 3 Department of Veterinary Microbiology, CAU , Selesih, Aizawl, Mizoram, India
| | - Sarbaswarup Ghosh
- 4 Sasya Shyamala Krishi Vigyan Kendra, Ramakrishna Mission Vivekananda Educational and Research Institute , Arapanch, Sonarpur, Kolkata, India
| | - Pramod K Nanda
- 1 ICAR-Indian Veterinary Research Institute , ERS, Kolkata, India
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Abstract
BACKGROUND Coping style adopted by a person has been identified as an important factor in precipitating or preventing an intentional self-harm attempt. While the influence of reactive coping has received lot of research attention, effects of proactive coping on suicidal behavior has not been studied, even though it is known that proactive coping is associated with better mental health. The authors in the current study sought to investigate the relationship of proactive coping style with attempted deliberate self-harm. MATERIALS AND METHODS A total of 44 individuals who presented with intentional self-harm were compared with age, sex, marital status, and education-matched healthy controls. Pierce Suicide Intent Scale was used to ascertain suicidal intent, and Proactive Coping Inventory was used to assess proactive coping. RESULTS There were no significant differences between subjects and controls for proactive coping, preventive coping, emotional support seeking, avoidance coping, and instrumental support seeking. However, participants scored higher in strategic planning (P = 0.027). CONCLUSIONS Proactive coping has no significant relationship with intentional self-harm; however, more studies with better designs are needed to comment conclusively.
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Affiliation(s)
- D Bhattacharyya
- Department of Psychiatry, Base Hospital Delhi Cantt, New Delhi, India
| | - M Namdeo
- Department of Psychiatry, Base Hospital Delhi Cantt, New Delhi, India
| | - A K Dwivedi
- Department of Psychiatry, Base Hospital Delhi Cantt, New Delhi, India
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42
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Dixit S, Chauhan VS, Bhattacharyya D. Are Indian Peacekeepers on Path to Mental Peace? J Clin Diagn Res 2018. [DOI: 10.7860/jcdr/2018/37099.12320] [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: 11/24/2022]
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43
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Bajpai G, Srivastava T, Patra N, Moirangthem I, Jha SN, Bhattacharyya D, Riyajuddin S, Ghosh K, Basaula DR, Khan M, Liu SW, Biring S, Sen S. Correction: Effect of ionic size compensation by Ag + incorporation in homogeneous Fe-substituted ZnO: studies on structural, mechanical, optical, and magnetic properties. RSC Adv 2018; 8:29228-29229. [PMID: 35547997 PMCID: PMC9084492 DOI: 10.1039/c8ra90069h] [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: 08/03/2018] [Accepted: 08/03/2018] [Indexed: 11/26/2022] Open
Abstract
Correction for ‘Effect of ionic size compensation by Ag+ incorporation in homogeneous Fe-substituted ZnO: studies on structural, mechanical, optical, and magnetic properties’ by Gaurav Bajpai et al., RSC Adv., 2018, 8, 24355–24369.
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Affiliation(s)
- Gaurav Bajpai
- Metallurgical Engg. and Material Sciences
- Indian Institute of Technology Indore
- India
| | - Tulika Srivastava
- Metallurgical Engg. and Material Sciences
- Indian Institute of Technology Indore
- India
| | - N. Patra
- Atomic & Molecular Physics Division
- Bhabha Atomic Research Centre
- Mumbai
- India
| | | | - S. N. Jha
- Atomic & Molecular Physics Division
- Bhabha Atomic Research Centre
- Mumbai
- India
| | - D. Bhattacharyya
- Atomic & Molecular Physics Division
- Bhabha Atomic Research Centre
- Mumbai
- India
| | | | | | | | - Mahmud Khan
- Department of Physics
- Miami University
- Oxford
- USA
| | - Shun-Wei Liu
- Electronic Engg
- Ming Chi University of Technology
- New Taipei City
- Taiwan
| | - Sajal Biring
- Electronic Engg
- Ming Chi University of Technology
- New Taipei City
- Taiwan
| | - Somaditya Sen
- Metallurgical Engg. and Material Sciences
- Indian Institute of Technology Indore
- India
- Department of Physics
- Indian Institute of Technology Indore
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44
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Verma PK, Mohapatra PK, Bhattacharyya A, Yadav AK, Jha SN, Bhattacharyya D. Structural investigations on uranium(vi) and thorium(iv) complexation with TBP and DHOA: a spectroscopic study. NEW J CHEM 2018. [DOI: 10.1039/c7nj04460g] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Spectroscopic studies were carried out to understand the complexation of U(vi) and Th(iv) with tri-butyl phosphate (TBP) and N,N-dihexyl octanamide (DHOA) in different non-aqueous solvents.
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Affiliation(s)
- P. K. Verma
- Radiochemistry Division
- Bhabha Atomic Research Centre
- Mumbai – 400 085
- India
| | - P. K. Mohapatra
- Radiochemistry Division
- Bhabha Atomic Research Centre
- Mumbai – 400 085
- India
| | - A. Bhattacharyya
- Radiochemistry Division
- Bhabha Atomic Research Centre
- Mumbai – 400 085
- India
| | - A. K. Yadav
- Atomic and Molecular Physics Division, Bhabha Atomic Research Centre
- Mumbai – 400 085
- India
| | - S. N. Jha
- Atomic and Molecular Physics Division, Bhabha Atomic Research Centre
- Mumbai – 400 085
- India
| | - D. Bhattacharyya
- Atomic and Molecular Physics Division, Bhabha Atomic Research Centre
- Mumbai – 400 085
- India
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45
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Panda P, Ramaseshan R, Sahoo M, Krishna NG, Yadav AK, Jha SN, Bhattacharyya D. Local crystal structure in the vicinity of Cr in doped AlN thin films studied by X-ray absorption spectroscopy. Phys Chem Chem Phys 2018; 20:13084-13091. [DOI: 10.1039/c8cp01686k] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
This article reports the detailed X-ray absorption spectroscopy (XAS) study of Al1−xCrxN (x = 4, 6, 11%) thin films synthesized by the reactive magnetron co-sputtering technique.
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Affiliation(s)
- Padmalochan Panda
- Surface and Nanoscience Division
- Materials Science Group
- IGCAR
- HBNI
- Kalpakkam
| | - R. Ramaseshan
- Surface and Nanoscience Division
- Materials Science Group
- IGCAR
- HBNI
- Kalpakkam
| | - Madhusmita Sahoo
- Surface and Nanoscience Division
- Materials Science Group
- IGCAR
- HBNI
- Kalpakkam
| | | | - A. K. Yadav
- Atomic and Molecular Physics Division
- BARC
- Mumbai
- India
| | - S. N. Jha
- Atomic and Molecular Physics Division
- BARC
- Mumbai
- India
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46
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Gaur A, Nitin Nair N, Shrivastava B, Das B, Chakrabortty M, Jha S, Bhattacharyya D. Study of distorted octahedral structure in 3d transition metal complexes using XAFS. Chem Phys Lett 2018. [DOI: 10.1016/j.cplett.2017.12.067] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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47
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Bajpai G, Srivastava T, Patra N, Moirangthem I, Jha SN, Bhattacharyya D, Riyajuddin S, Ghosh K, Basaula DR, Khan M, Liu SW, Biring S, Sen S. Effect of ionic size compensation by Ag+ incorporation in homogeneous Fe-substituted ZnO: studies on structural, mechanical, optical, and magnetic properties. RSC Adv 2018; 8:24355-24369. [PMID: 35539190 PMCID: PMC9082016 DOI: 10.1039/c8ra02393j] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [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: 03/19/2018] [Revised: 08/16/2018] [Accepted: 06/21/2018] [Indexed: 11/26/2022] Open
Abstract
Substituting an ion of different size from that of the host element introduces lattice strain and defects. However, this mismatch may be significantly reduced by substituting an additional ion with a compensating size relative to the dopant. Such a double substitution might offer better solubility irrespective of the local distortions as well as the formation of defects in the valence states. Fe-substituted ZnO has been widely reported with conflicting results primarily arising from lack of chemical and structural homogeneity originating from preparation techniques, compositional fluctuations, and equivocal comprehension of actual solubility limits of the dopants. In this study, Ag ion has been incorporated in Fe-substituted ZnO to compensate the ionic size of Zn1−x[Fe0.8Ag0.2]xO (0 ≤ x ≤ 0.03125) by determining the solubility limit of the homogeneous material and their corresponding structural, mechanical, optical and magnetic properties have been investigated thoroughly. Co-substitution rearranges the lattice and leads to better crystal structures with tunable properties related to the amount of substitution. Substituting an ion of different size from that of the host element introduces lattice strain and defects.![]()
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Affiliation(s)
- Gaurav Bajpai
- Metallurgical Engg. and Material Sciences
- Indian Institute of Technology Indore
- India
| | - Tulika Srivastava
- Metallurgical Engg. and Material Sciences
- Indian Institute of Technology Indore
- India
| | - N. Patra
- Atomic & Molecular Physics Division
- Bhabha Atomic Research Centre
- Mumbai
- India
| | | | - S. N. Jha
- Atomic & Molecular Physics Division
- Bhabha Atomic Research Centre
- Mumbai
- India
| | - D. Bhattacharyya
- Atomic & Molecular Physics Division
- Bhabha Atomic Research Centre
- Mumbai
- India
| | | | | | | | - Mahmud Khan
- Department of Physics
- Miami University
- Oxford
- USA
| | - Shun-Wei Liu
- Electronic Engg
- Ming Chi University of Technology
- New Taipei City
- Taiwan
| | - Sajal Biring
- Electronic Engg
- Ming Chi University of Technology
- New Taipei City
- Taiwan
| | - Somaditya Sen
- Metallurgical Engg. and Material Sciences
- Indian Institute of Technology Indore
- India
- Department of Physics
- Indian Institute of Technology Indore
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48
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Banerjee D, Gupta SK, Patra N, Raja SW, Pathak N, Bhattacharyya D, Pujari PK, Thakare SV, Jha SN. Unraveling doping induced anatase–rutile phase transition in TiO2 using electron, X-ray and gamma-ray as spectroscopic probes. Phys Chem Chem Phys 2018; 20:28699-28711. [DOI: 10.1039/c8cp04310h] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The present work reports the microscopic details of anatase (A) to rutile (R) phase transformation in a Mn-doped TiO2 system.
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Affiliation(s)
- D. Banerjee
- Accelerator Chemistry Section
- Radiochemistry Division (BARC)
- Variable Energy Cyclotron Centre
- Kolkata-700064
- India
| | - Santosh K. Gupta
- Radiochemistry Division
- Bhabha Atomic Research Centre
- Mumbai-400085
- India
| | - N. Patra
- Atomic and Molecular Physics Division
- Bhabha Atomic Research Centre
- Mumbai-400085
- India
| | - Sk Wasim Raja
- Accelerator Chemistry Section
- Radiochemistry Division (BARC)
- Variable Energy Cyclotron Centre
- Kolkata-700064
- India
| | - N. Pathak
- Radiochemistry Division
- Bhabha Atomic Research Centre
- Mumbai-400085
- India
| | - D. Bhattacharyya
- Atomic and Molecular Physics Division
- Bhabha Atomic Research Centre
- Mumbai-400085
- India
| | - P. K. Pujari
- Radiochemistry Division
- Bhabha Atomic Research Centre
- Mumbai-400085
- India
| | - S. V. Thakare
- Radiopharmaceuticals Division
- Bhabha Atomic Research Centre
- Mumbai-400085
- India
| | - S. N. Jha
- Atomic and Molecular Physics Division
- Bhabha Atomic Research Centre
- Mumbai-400085
- India
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49
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Mallick Gupta A, Mukherjee S, Dutta A, Mukhopadhyay J, Bhattacharyya D, Mandal S. Identification of a suitable promoter for the sigma factor of Mycobacterium tuberculosis. Mol Biosyst 2017; 13:2370-2378. [PMID: 28952652 DOI: 10.1039/c7mb00317j] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Promoter binding specificity is one of the important characteristics of transcription by Mycobacterium tuberculosis (Mtb) sigma (σ) factors, which remains unexplored due to limited structural evidence. Our previous study on the structural features of Mtb-SigH, consisting of three alpha helices, and its interaction with core RNA polymerase has been extended herein to determine the little known DNA sequence recognition pattern involving its cognate promoters. Herein, high resolution X-ray crystallographic structures of the protein-DNA complexes were inspected to determine the tentative DNA-binding helix of the σ factor. The binding interface in the available crystal structures is found to be populated mainly with specific residues such as Arg, Asn, Lys, Gln, and Ser. We uncovered the helix 3 of Mtb-SigH containing most of these amino acids, which ranged from Arg 64 to Arg 75, forming the predicted active site. The complex of Mtb-SigH:DNA is modelled with 20 promoter sequences. The binding affinity is predicted by scoring these protein-DNA complexes through proximity and interaction parameters obtained by molecular dynamics simulations. The promoters are ranked considering hydrogen bonding, energy of interaction, buried surface area, and distance between centers of masses in interaction with the protein. The ranking is validated through in vitro transcription assays. The trends of these selected promoter interactions have shown variations parallel to the experimental evaluation, emphasizing the success of the active site determination along with screening of the promoter strength. The promoter interaction of Mtb-SigH can be highly beneficial for understanding the regulation of gene expression of a pathogen and also extends a solid platform to predict promoters for other bacterial σ factors.
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Affiliation(s)
- A Mallick Gupta
- Department of Microbiology, University of Calcutta, 35, Ballygunge Circular Road, Kolkata, 700019, India.
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50
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Mahanti A, Ghosh P, Samanta I, Joardar SN, Bandyopadhyay S, Bhattacharyya D, Banerjee J, Batabyal S, Sar TK, Dutta TK. Prevalence of CTX-M-Producing Klebsiella spp. in Broiler, Kuroiler, and Indigenous Poultry in West Bengal State, India. Microb Drug Resist 2017; 24:299-306. [PMID: 28829687 DOI: 10.1089/mdr.2016.0096] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023] Open
Abstract
This study was undertaken to detect the prevalence of CTX-M-producing Klebsiella spp. in healthy broiler, indigenous, and kuroiler birds reared in West Bengal (India) during November 2014-February 2015. In addition to CTX-M gene, the study was also conducted to reveal the occurrence of other β-lactamase and class I integron genes in Klebsiella spp. isolates along with their clonal relationship. A total of 321 cloacal swabs from healthy broiler, indigenous, and kuroiler birds were collected from different places of West Bengal, India. Klebsiella spp. isolation rate varies among different types of poultry birds (43.8-72.3%). In total, 33 (10.7%) Klebsiella spp. isolates were detected phenotypically as CTX-M producers and all the isolates possessed blaCTX-M in polymerase chain reaction. Whereas 17 (51.5%) and 16 (48.5%) Klebsiella spp. isolates possessed blaSHV, and blaTEM with blaCTX-M, respectively. None of the CTX-M-producing Klebsiella spp. isolates in this study possessed class I integron gene. Randomly amplified polymorphic DNA-based phylogenetic tree revealed the presence of clonal relationship among the CTX-M-producing Klebsiella spp. isolates, recovered from broilers and indigenous birds. This study identified broilers and indigenous game birds as a potential reservoir of CTX-M-producing Klebsiella spp., which could be transmitted to the human food chain directly or indirectly.
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Affiliation(s)
- Achintya Mahanti
- 1 Department of Veterinary Microbiology, West Bengal University of Animal and Fishery Sciences , Kolkata, India
| | - Pratik Ghosh
- 1 Department of Veterinary Microbiology, West Bengal University of Animal and Fishery Sciences , Kolkata, India
| | - Indranil Samanta
- 1 Department of Veterinary Microbiology, West Bengal University of Animal and Fishery Sciences , Kolkata, India
| | - Siddhartha Narayan Joardar
- 1 Department of Veterinary Microbiology, West Bengal University of Animal and Fishery Sciences , Kolkata, India
| | | | | | - Jaydeep Banerjee
- 2 Eastern Regional Station, Indian Veterinary Research Institute , Kolkata, India
| | - Subhasis Batabyal
- 3 Department of Veterinary Biochemistry, West Bengal University of Animal and Fishery Sciences , Kolkata, India
| | - Tapas Kumar Sar
- 4 Department of Veterinary Pharmacology and Toxicology, West Bengal University of Animal and Fishery Sciences , Kolkata, India
| | - Tapan Kumar Dutta
- 5 Department of Veterinary Microbiology, Central Agricultural University , Aizawl, India
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