310 results on '"Mondal, AK"'
Search Results
2. Erratum to 'A clinical study to evaluate the efficacy and safety of Bacopa Caplets in memory and learning ability: a double blind placebo controlled study', Australian Journal of Herbal Medicine 2011, 23:3;122-125
- Author
-
Mondal, AK, Hegde, S, and Patki, PS
- Published
- 2013
3. Graphene-Based Planar Microsupercapacitors: Recent Advances and Future Challenges
- Author
-
Liang, J, Mondal, AK, Wang, DW, and Iacopi, F
- Abstract
© 2018 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim The continuous development of integrated electronics such as maintenance-free biosensors, remote and mobile environmental sensors, wearable personal electronics, nanorobotics etc. and their continued miniaturization has led to an increasing demand for miniaturized energy storage units. Microsupercapacitors with graphene electrodes hold great promise as miniaturized, integrated power sources thanks to their fast charge/discharge rates, superior power performance, and long cycling stability. In addition, planar interdigitated electrodes also have the capability to reduce ion diffusion distances leading to a greatly improved electrochemical performance. Either as standalone power sources or complementing energy harvesting units, it is expected that graphene-based microsupercapacitors will play a key role as miniaturized power sources in electronic microsystems. This review highlights the recent development, challenges, and perspectives in this area, with an emphasis on the link between material and geometry design of planar graphene-based electrodes and their electrochemical performance and integrability.
- Published
- 2019
4. Nitrogen-doped porous carbon nanosheets from eco-friendly eucalyptus leaves as high performance electrode materials for supercapacitors and lithium ion batteries
- Author
-
Mondal, AK, Kretschmer, K, Zhao, Y, Liu, H, Wang, C, Sun, B, and Wang, G
- Subjects
General Chemistry - Abstract
© 2017 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim. Nitrogen-doped porous carbon nanosheets were prepared from eucalyptus tree leaves by simply mixing the leaf powders with KHCO3 and subsequent carbonisation. Porous carbon nanosheets with a high specific surface area of 2133 m2g-1 were obtained and applied as electrode materials for supercapacitors and lithium ion batteries. For supercapacitor applications, the porous carbon nanosheet electrode exhibited a supercapacitance of 372 Fg-1 at a current density of 500 mAg-1 in 1m H2SO4 aqueous electrolyte and excellent cycling stability over 15000 cycles. In organic electrolyte, the nanosheet electrode showed a specific capacitance of 71 Fg-1 at a current density of 2 Ag-1 and stable cycling performance. When applied as the anode material for lithium ion batteries, the as-prepared porous carbon nanosheets also demonstrated a high specific capacity of 819 mAhg-1 at a current density of 100 mAg-1, good rate capability, and stable cycling performance. The outstanding electrochemical performances for both supercapacitors and lithium ion batteries are derived from the large specific surface area, porous nanosheet structure and nitrogen doping effects. The strategy developed in this paper provides a novel route to utilise biomass-derived materials for low-cost energy storage systems.
- Published
- 2017
5. A novel lithium-ion hybrid capacitor based on an aerogel-like MXene wrapped Fe2O3 nanosphere anode and a 3D nitrogen sulphur dual-doped porous carbon cathode
- Author
-
Tang, X, Liu, H, Guo, X, Wang, S, Wu, W, Mondal, AK, Wang, C, Wang, G, Tang, X, Liu, H, Guo, X, Wang, S, Wu, W, Mondal, AK, Wang, C, and Wang, G
- Abstract
© 2018 the Partner Organisations. Lithium-ion capacitors (LICs) have emerged as promising energy storage devices with both high energy density and high power density. However, due to the mismatch of charge-storage capacity and electrode kinetics between battery-type anodes and capacitor-type cathodes, the application of lithium-ion capacitors has been limited. In this work, interconnected aerogel-like MXene wrapped Fe2O3 nanospheres have been prepared and investigated as battery-type anode materials for lithium-ion capacitors. In this rationally designed hybrid electrode, the Ti3C2Tx MXene matrix is capable of providing fast transport of electrons and suppressing the volume change of Fe2O3. Simultaneously, Fe2O3 hollow nanospheres offer large specific capacity and prevent restacking of the MXene layers, synergizing to boost the electrochemical performances of such hybrid electrodes. Meanwhile, the three-dimensional (3-D) nitrogen and sulphur dual-doped porous carbon (NS-DPC) derived from biomass has also been fabricated as a capacitor-type cathode material for lithium-ion capacitors. Consequently, the lithium-ion capacitors can demonstrate a high energy density of 216 W h kg-1 at a power density of 400 W kg-1 and a high power density of 20 kW kg-1 at an energy density of 96.5 W h kg-1. This work elucidates that both high energy density and power density can be achieved in hybrid lithium-ion capacitors.
- Published
- 2018
6. On a conductor formula of Bushnell, Henniart and Kutzko
- Author
-
MONDAL, AK
- Subjects
Representations ,Rankin-Selberg Convolutions ,Gl(N) - Abstract
The explicit conductor formula of Bushnell, Henniart and Kutzko [BHK98] computes the conductor of a pair of supercuspidal representations of general linear groups over a non-archimedean local field in terms of inducing data for these representations. There are essentially two cases to consider, depending on whether a supercuspidal type admits a split cover or not. The strategy in [BHK98] is to deal with the split case first and to reduce the non-split case to the split case. In this paper, we give a direct proof of the non-split (self-dual) case of the conductor formula.
- Published
- 2016
7. Influence of the micro-structural factors upon thermal and mechanical properties of various bag leathers
- Author
-
Mondal, AK, primary and Chattopadhyay, PK, primary
- Published
- 2017
- Full Text
- View/download PDF
8. Microwave synthesis of α-Fe2O3 nanoparticles and their lithium storage properties: A comparative study
- Author
-
Mondal, AK, Chen, S, Su, D, Kretschmer, K, Liu, H, and Wang, G
- Subjects
Materials - Abstract
© 2015 Elsevier B.V. All rights reserved. This work introduces a simple microwave method for the preparation of α-Fe2O3 nanoparticles with two different sizes. Both the materials were characterized by X-ray powder diffraction, scanning electron microscopy, transmission electron microscopy and Brunauer-Emmett-Teller methods. The lithium storage properties were evaluated and compared in terms of their reversible capacity, rate capability and cycling performance. Interestingly, the electrode made of large particles (200-300 nm) show the reversible capacity of 1012 mA h g-1, better rate capability and excellent cycling stability than those of the small particles (20-30 nm). The poor electrochemical performances of small particles can be ascribed to their agglomeration during repeated charging and discharge process. The agglomeration of small particles may substantially decrease the surface area, which results in the lack of sufficient electro active sites for electrochemical reaction.
- Published
- 2015
9. Naturally nitrogen doped porous carbon derived from waste shrimp shells for high-performance lithium ion batteries and supercapacitors
- Author
-
Mondal, AK, Kretschmer, K, Zhao, Y, Liu, H, Fan, H, Wang, G, Mondal, AK, Kretschmer, K, Zhao, Y, Liu, H, Fan, H, and Wang, G
- Abstract
© 2017 Elsevier Inc. Transformation of biomass wastes into sustainable low cost carbon materials is now a topic of great interest. Here, we describe porous carbon from biomass derived waste shrimp shells and its application in two different energy storage systems. The unique porous structure with the presence of heteroatoms (O, N) makes it promising material for both lithium ion batteries and supercapacitors. When applied as anode materials for lithium ion batteries, the as-prepared carbon showed a specific capacity as high as 1507 mA h g−1 and 1014 mA h g−1 at current densities of 0.1 A g−1 and 0.5 A g−1, respectively, good rate performance and superior cycling stability. The porous carbon-based supercapacitor also delivered a specific capacitance of 239 F g−1 at a current density of 0.5 A g−1 in 6 M KOH electrolyte. The specific capacitance retention is 99.4% even after 5000 charge-discharge cycles, indicating excellent cycling stability. The superior electrochemical performances for both lithium ion batteries and supercapacitors could be ascribed to the high specific surface area, porous structure and nitrogen doping effect.
- Published
- 2017
10. A microwave synthesis of mesoporous NiCo2O4 nanosheets as electrode materials for lithium-ion batteries and supercapacitors
- Author
-
Mondal, AK, Su, D, Chen, S, Kretschmer, K, Xie, X, Ahn, HJ, and Wang, G
- Subjects
Chemical Physics - Abstract
© 2015 Wiley-VCH Verlag GmbH & Co. KGaA , Weinheim. A facile microwave method was employed to synthesize NiCo2O4 nanosheets as electrode materials for lithium-ion batteries and supercapacitors. The structure and morphology of the materials were characterized by X-ray diffraction, fieldemission scanning electron microscopy, transmission electron microscopy and Brunauer-Emmett-Teller methods. Owing to the porous nanosheet structure, the NiCo2O4 electrodes exhibited a high reversible capacity of 891 mAhg-1 at a current density of 100 mAg-1, good rate capability and stable cycling performance. When used as electrode materials for supercapacitors, NiCo2O4 nanosheets demonstrated a specific capacitance of 400 Fg-1 at a current density of 20 Ag-1 and superior cycling stability over 5000 cycles. The excellent electrochemical performance could be ascribed to the thin porous structure of the nanosheets, which provides a high specific surface area to increase the electrode-electrolyte contact area and facilitate rapid ion transport.
- Published
- 2015
11. Corrosion behaviour of creep-resistant AE42 magnesium alloy-based hybrid composites developed for powertrain applications
- Author
-
Mondal, AK, Blawert, C, and Kumar, S
- Subjects
Materials Engineering (formerly Metallurgy) - Abstract
The corrosion behaviour of AE42 magnesium alloy and its composites reinforced with Saffil short fibres and SiC particles in various combinations was investigated. The corrosion rate of the unreinforced alloy was the lowest. The composite reinforced with Saffil short fibre alone exhibited slightly lower corrosion rate than the hybrid composites containing both Saffil short fibres and SiC particles. However, there was no specific trend observed in the corrosion rate of the hybrid composites with respect to the SiC particle content. The degradation of corrosion resistance of the composites was mainly attributed to the irregular and loose surface films.
- Published
- 2015
12. Electrode materials for lithium-ion batteries and supercapacitors
- Author
-
Mondal, AK
- Abstract
University of Technology, Sydney. Faculty of Science. With the increasing demand for energy and growing concern about environmental pollution caused by the enormous consumption of fossil fuels, it is an urgent need of renewable energy and clean energy sources. Development of suitable mobile electronics or energy storage technologies that can be used in electric vehicles would help to address problem. As energy storage devices, lithium-ion batteries have attracted attention due to their high energy density and storage capacity. Supercapacitors have attracted enormous attention due to high power density and long cycle life. The exploration of new electrode materials for lithium-ion batteries and supercapacitors is the focus of research to satisfy the ever-rising demands for better performance including longer cycle life and improved safety. Nanostructured materials exhibit excellent electrochemical performances, and they are regarded as promising materials for high-performance lithium-ion batteries and supercapacitors. In this doctoral study, various nanostructured materials such as, nanosheets, nanospheres, nanobelts, nanoflakes, hybrid nanostructures and mesoporous structures have been successfully synthesized and characterised, using different methods. Their electrochemical properties have also been evaluated by cyclic voltammetry, galvanostatic charge-discharge, and electrochemical impedance spectra. Nickel oxide (NiO) nanosheets have been synthesized, using a simple ethylene glycol mediated hydrothermal method. When evaluated as anode materials for lithium ion batteries, NiO nanosheets exhibited high reversible capacities of 1193 mA h g⁻¹ at the current density of 500 mA g⁻¹ with enhanced rate capability and good cycling stability. While as electrode materials for supercapacitors, NiO nanosheets also demonstrated a superior specific capacitance of 999 F g⁻¹ at the current density of 20 A g⁻¹ with excellent cycling performance. The spherical β-Ni(OH)₂ superstructures was successfully synthesised in a single-step microwave-assisted process, without using any templates. Due to its unique morphology, the prepared β-Ni(OH)2 electrode displayed a high and specific capacitance of 2147 F g⁻¹ at a discharge current of 1 A g⁻¹ with excellent cycling stability (99.5 % capacitance retained after 2000 cycles). A straight forward microwave reaction was employed to successfully prepare α-Fe₂O₃ nanoparticles with two different sizes. When used as anode materials for lithium ion batteries of both the materials showed good electrochemical performances. Remarkably, the electrode made of larger particles (200-300 nm) exhibited higher reversible capacity of 1012 mA h g⁻¹ with better rate capability and excellent cycling stability (88 % retention after 80 cycles) than those of the smaller particles (20-30 nm) (49 % retention after 80 cycles). The better lithium storage properties of the large particles can be attributed to their structural integrity during cycling, which offers adequate spaces to accommodate volume expansion during Li⁺ insertion/extraction and shortens the diffusion paths of lithium ions. Highly porous NiCo₂O₄ nanoflakes and nanobelts were prepared in two steps; the NiCo₂O₄ intermediates were first formed by a hydrothermal method and the intermediates were simply thermal treated to the final product. Owing to their unique porous structural features, the NiCo₂O₄ nanoflakes and nanobelts exhibited high specific capacities of 1033 mA h g⁻¹ and 1056 mA h g⁻¹, respectively, good cycling stability and rate capability. These exceptional electrochemical performances could be attributed to the unique structure of high surface area and void spaces within the surface of nanoflakes and nanobelts, which provides large contact areas between electrolyte and active materials for electrolyte diffusion and cushions the volume change during charge-discharge cycling. Graphene/MnO₂ hybrid nanosheets were prepared by the incorporating graphene and MnO₂ nanosheets in ethylene glycol. As electrode materials for supercapacitors, graphene/MnO₂ hybrid nanosheets of different ratios were investigated. The graphene/MnO₂ hybrid nanosheets with a weight ratio of 1:4 (graphene: MnO₂) delivered the highest specific capacitance of 320 F g⁻¹, and exhibited good capacitance retention on 2000 cycles. Mesoporous NiCo₂O₄ nanosheets were synthesized by microwave method and applied as electrode materials for lithium ion batteries and supercapacitors. Due to its porous nanosheet structure, the NiCo₂O₄ electrodes exhibited a high reversible capacity of 891 mA h g⁻¹ at the current density of 100 mA g⁻¹ with good rate capability and stable cycling performance. When used as electrode materials for supercapacitors, NiCo₂O₄ nanosheets demonstrated a specific capacitance of 400 F g⁻¹ at the current density of 20 A g⁻¹ and superior cycling stability over 5000 cycles. The excellent electrochemical performance could be ascribed to the thin porous nanosheet structure, which provided high specific surface area to increase electrode-electrolyte contact area and facilitate rapid ion transport. Mesoporous flake-like Manganese-cobalt composite oxide (MnCo₂O₄) was successfully synthesized, using the hydrothermal method. The flake-like MnCo₂O₄ was evaluated as anode materials for lithium ion batteries. It exhibited superior rate capability and good cycling stability with a high reversible capacity of 1066 mA h g⁻¹. As electrode materials for supercapacitors, MnCo₂O₄ also demonstrated a high super capacitance of 1487 F g⁻¹ at the current density of 1 A g⁻¹ and superior cycling stability over 2000 charge-discharge cycles.
- Published
- 2015
13. A comparative investigation on the effects of nitrogen-doping into graphene on enhancing the electrochemical performance of SnO2/graphene for sodium-ion batteries
- Author
-
Xie, X, Su, D, Zhang, J, Chen, S, Mondal, AK, and Wang, G
- Subjects
Nanoscience & Nanotechnology - Abstract
© 2015 The Royal Society of Chemistry. SnO2/nitrogen-doped graphene nanohybrids have been synthesized by an in situ hydrothermal method, during which the formation of SnO2 nanocrystals and nitrogen doping of graphene occur simultaneously. The as-prepared SnO2/nitrogen-doped graphene nanohybrids exhibit enhanced electrochemical performance for sodium-ion batteries compared to SnO2/graphene nanocomposites. A systematic comparison between SnO2/nitrogen-doped graphene nanohybrids and the SnO2/graphene counterpart as anode materials for sodium-ion batteries has been conducted. The comparison is in a reasonable framework, where SnO2/nitrogen-doped graphene nanohybrids and the SnO2/graphene counterpart have the same SnO2 ratio, similar SnO2 crystallinity and particle size, close surface area and pore size. The results clearly manifest that the improved electron transfer efficiency of SnO2/nitrogen-doped graphene due to nitrogen-doping plays a more important role than the increased electro-active sites within graphene network in enhancing the electro-activity of SnO2/nitrogen-doped graphene nanohybrids compared to the SnO2/graphene counterpart. In contrast to the previous reports which often ascribe the enhanced electro-activity of nitrogen-doped graphene based composites to two nitrogen-doping effects (improving the electron transfer efficiency and increasing electro-active sites within graphene networks) in one single declaration, this work is expected to provide more specific information for understanding the effects of nitrogen-doping into graphene on improving the electrochemical performance of graphene based composites.
- Published
- 2015
14. Multiwall carbon nanotube-nickel cobalt oxide hybrid structure as high performance electrodes for supercapacitors and lithium ion batteries
- Author
-
Mondal, AK, Liu, H, Li, ZF, Wang, G, Mondal, AK, Liu, H, Li, ZF, and Wang, G
- Abstract
© 2015 Elsevier Ltd. All rights reserved. We developed a simple strategy to prepare a multiwall carbon nanotube-nickel cobalt oxide nanosheet hybrid structure by using a microwave method followed by subsequent calcination in air. The structure and morphology of the material are characterized by X-ray diffraction, scanning electron microscopy and transmission electron microscopy. When applied as electrode material in 2 M KOH electrolyte for supercapacitors, the multiwall carbon nanotube-nickel cobalt oxide nanosheet structure shows a high specific capacitance of 1395 F g-1 at a current density of 1 A g-1 and excellent cycling stability over 5000 cycles. As an anode material for lithium ion battery applications, the hybrid material presents a high reversible capacity of 904 mA h g-1, good rate capability and better cycling performance than nickel cobalt oxide nanosheets and pristine multiwall carbon nanotube. The improved performances of supercapacitors and lithium ion batteries could be accredited to the unique structural features, which support high electron conductivity and rapid ion/electron transport within the electrode and at the electrode/electrolyte interface, and also accommodate volume variation during charge-discharge cycling.
- Published
- 2016
15. Organic sodium terephthalate@graphene hybrid anode materials for sodium-ion batteries
- Author
-
Wang, Y, Kretschmer, K, Zhang, J, Mondal, AK, Guo, X, Wang, G, Wang, Y, Kretschmer, K, Zhang, J, Mondal, AK, Guo, X, and Wang, G
- Abstract
© The Royal Society of Chemistry 2016. In the search for high-performance electrodes for sodium-ion battery applications, there is a high demand for organic materials with satisfactory electrochemical performances, especially high rate capabilities. Herein, we report an organic based composite, sodium terephthalate@graphene (Na2TP@GE) hybrid synthesized via freeze-drying technique. This material shows an interconnected, multi-channelled monolith structure, which resulted in outstanding rate capability for sodium storage. This hybrid material demonstrated a high reversible capacity of 268.9 mA h g-1 and prolonged cyclability with capacity retention of 77.3% over 500 cycles.
- Published
- 2016
16. Biogas from slaughter house waste and optimization of the process
- Author
-
Rouf, MA, primary, Islam, MS, primary, Rabeya, T, primary, Mondal, AK, primary, Khanam, M, primary, Samadder, PR, primary, and Ara, Y, primary
- Published
- 2016
- Full Text
- View/download PDF
17. A simple approach to prepare nickel hydroxide nanosheets for enhanced pseudocapacitive performance
- Author
-
Mondal, AK, Su, D, Chen, S, Sun, B, Li, K, and Wang, G
- Abstract
Nickel hydroxide nanosheets were synthesized by a simple microwave assisted heating method and investigated as electrochemical pseudo-capacitive materials for supercapacitors. The crystalline structure and morphology of the as-obtained Ni(OH)2 nanosheets were characterized by X-ray diffraction, nitrogen adsorption-desorption isotherms, field emission scanning electron microscopy and transmission electron microscopy. The electrochemical properties of the Ni(OH)2 nanosheets were evaluated by cyclic voltammetry and chronopotentiometry technology in 2 M KOH solution. The nickel hydroxide nanosheet electrode shows a maximum specific capacitance of 2570 F g -1 at a current density of 5 A g-1 and exhibits superior cycling stability. These results suggest its potential application as an electrode material for supercapacitors. © the Partner Organisations 2014.
- Published
- 2014
18. Fabrication and enhanced electrochemical performances of Mo03/graphene composite as anode material for lithium-ion batteries
- Author
-
Mondal, AK, Chen, S, Su, D, Liu, H, and Wang, G
- Abstract
Molybdenum trioxide (Mo0#)/graphene composite were prepared by integrating Mo03 and graphene in dimethylformamide (DMF). The morphology and structure of the materials were characterized by X-ray diffraction, field emission scanning electron microscopy and transmission electron microscopy. The electrochemical properties of Mo03/graphene composite with different ratios were studied as anode materials for lithium-ion batteries using galavanostatic charge-discharge and cyclic voltammetry. We observed that the Mo03/graphene anode with a weight ratio of 1:1 (Mo03 graphene) exhibits a high lithium storage capacity of 967 mA h g-1 at the current density of 500 mA g-1, satisfactory cycling stability and good rate capability.
- Published
- 2014
19. Preparation and enhanced electrochemical performance of MnO 2 nanosheets for supercapacitors
- Author
-
Mondal, AK, Wang, B, Su, D, Wang, Y, Zhang, X, and Wang, G
- Subjects
General Chemistry - Abstract
MnO 2 nanosheets have been synthesized by using a redox reaction of manganese nitrate tetrahydrate and potassium permanganate without any surfactants. The morphology and microstructure of the as-prepared material were characterized by field emission scanning electron microscopy, transmission electron microscopy and X-ray diffraction (XRD). Electrochemical performances as electrode materials for supercapacitor were evaluated using cyclic voltammetry and galvanostatic charge-discharge in 1 M Na 2SO 4 aqueous electrolyte. It was found that MnO 2 nanosheets showed an excellent capacitive behaviour with good cycling stability. The specific capacitance of the MnO 2 nanosheet electrode can reach up to 332.8 Fg -1 at a current density of 500 mA/g and a stable cycling performance. © 2012 The Chemical Society Located in Taipei & Wiley-VCH Verlag GmbH & Co. KGaA,Weinheim.
- Published
- 2012
20. Anaerobic digestion of mixed dried fallen leaves by mixing with cow dung
- Author
-
Rouf, MA, primary, Islam, MS, primary, Rabeya, T, primary, and Mondal, Ak, primary
- Published
- 2015
- Full Text
- View/download PDF
21. Interrupted creep of newly developed high pressure die cast Magnesium Alloys
- Author
-
Fechner, D, Dieringa, H, Maier, P, Kainer, KU, Mondal, AK, and Kumar, S
- Subjects
Materials Engineering (formerly Metallurgy) - Published
- 2007
22. Graphene/MnO2 hybrid nanosheets as high performance electrode materials for supercapacitors
- Author
-
Mondal, AK, Wang, B, Su, D, Wang, Y, Chen, S, Zhang, X, Wang, G, Mondal, AK, Wang, B, Su, D, Wang, Y, Chen, S, Zhang, X, and Wang, G
- Abstract
Graphene/MnO2 hybrid nanosheets were prepared by incorporating graphene and MnO2 nanosheets in ethylene glycol. Scanning electron microscopy and transmission electron microscopy analyses confirmed nanosheet morphology of the hybrid materials. Graphene/MnO2 hybrid nanosheets with different ratios were investigated as electrode materials for supercapacitors by cyclic voltammetry (CV) and galvanostatic charge-discharge in 1 M Na2SO4 electrolyte. We found that the graphene/MnO2 hybrid nanosheets with a weight ratio of 1:4 (graphene:MnO2) delivered the highest specific capacitance of 320 F g-1. Graphene/MnO2 hybrid nanosheets also exhibited good capacitance retention on 2000 cycles. © 2013 Elsevier B.V. All rights reserved.
- Published
- 2014
23. Microwave hydrothermal synthesis of urchin-like NiO nanospheres as electrode materials for lithium-ion batteries and supercapacitors with enhanced electrochemical performances
- Author
-
Mondal, AK, Su, D, Wang, Y, Chen, S, Liu, Q, Wang, G, Mondal, AK, Su, D, Wang, Y, Chen, S, Liu, Q, and Wang, G
- Abstract
Urchin-like NiO nanospheres were synthesised by a microwave hydrothermal method. The as-synthesised NiO nanospheres were characterised by X-ray diffraction, field emission scanning electron microscopy and transmission electron microscopy. It was found that NiO nanosphere consists of a nanoporous structure and nanosize crystals. When applied as anode materials in lithium-ion batteries, NiO nanospheres exhibited a high reversible specific capacity of 1027 mA h g-1, an excellent cycling performance and a good high rate capability. NiO nanospheres also showed a high specific capacitance as electrode materials for supercapacitors. © 2013 Elsevier B.V. All rights reserved.
- Published
- 2014
24. Hydrothermal synthesis of nickel oxide nanosheets for lithium-ion batteries and supercapacitors with excellent performance
- Author
-
Mondal, AK, Su, D, Wang, Y, Chen, S, Wang, G, Mondal, AK, Su, D, Wang, Y, Chen, S, and Wang, G
- Abstract
Nickel oxide nanosheets have been successfully synthesized by a facile ethylene glycol mediated hydrothermal method. The morphology and crystal structure of the nickel oxide nanosheets were characterized by X-ray diffraction, field-emission SEM, and TEM. When applied as electrode materials for lithium-ion batteries and supercapacitors, nickel oxide nanosheets exhibited a high, reversible lithium storage capacity of 1193 mA h g-1 at a current density of 500 mA g-1, an enhanced rate capability, and good cycling stability. Nickel oxide nanosheets also demonstrated a superior specific capacitance of 999 F g-1 at a current density of 20 A g-1 in supercapacitors. Between the sheets: NiO nanosheets were synthesized by a facile ethylene glycol mediated hydrothermal method (see picture). The NiO nanosheets exhibited a high, reversible lithium storage capacity of 1193 mA h g-1 at a current density of 500 mA g-1 for lithium-ion batteries and a superior specific capacitance of 999 F g-1 at a current density of 20 A g-1 in supercapacitors. Copyright © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
- Published
- 2013
25. Isolation and Qualitative Characterization of Antidepressant Marsiline by Liquid Chromatography Tandem Mass Spectrometry [LC-MS/MS] from Marsilea quadrifolia L.
- Author
-
Mondal, AK, primary, Sarkar, AK, additional, Pal, TK, additional, Das, N, additional, and Mondal (Parui), S, additional
- Published
- 2009
- Full Text
- View/download PDF
26. A Performance Evaluation of Lightweight Non-Contact Pavement Profilers
- Author
-
Petersen, DR, primary, Link, RE, additional, Hand, AJ, additional, Mondal, AK, additional, and Ward, DR, additional
- Published
- 2001
- Full Text
- View/download PDF
27. A Performance Evaluation of Lightweight Non-Contact Pavement Profilers
- Author
-
Hand, AJ, Mondal, AK, and Ward, DR
- Abstract
Pavement smoothness was recently identified as the most significant factor the motoring public uses to judge the quality of U.S. roadways. A new generation of lightweight profilers has been developed that have the potential of providing nearly instantaneous smoothness measurements, giving contractors a tool to identify and address process control issues promptly and cost effectively. This new technology was cooperatively evaluated by a team of Purdue University and Indiana Department of Transportation (INDOT) researchers to assess the performance of the devices, as well as the potential for their use in Indiana.A successful field test was conducted using four lightweight profilers that performed five replicate measurements at each of six sites: three, hot mix asphalt (HMA) and three, portland cement concrete (PCC). Smoothness data were reported in terms of International Roughness Index (IRI) and Profile Index with 0.0 and 0.2 in. (PI-0.0 and PI-0.2) blanking bands. The field test data showed good repeatability and poor reproducibility in terms of the smoothness indices considered, the profiles generated, and the identification of must-grind locations. Estimates of precision for the devices were determined in accordance with ASTM standards. The observed precision statements as well as statistical tests of between-vendor performance suggest that the performance of the devices, especially the reproducibility, should be improved prior to implementation of their use in construction specifications.
- Published
- 2001
- Full Text
- View/download PDF
28. Study on the preparation and properties of lignin-based flexible polyurethane foams with NaCl as a medium.
- Author
-
Han S, Huang G, Han H, Yan X, Xie J, He H, Mondal AK, Lin W, and Huang F
- Abstract
Currently, most polyols used in polyurethane foam (PUF) synthesis are derived from petrochemicals. However, lignin as the most abundant aromatic biopolymer rich in hydroxyl groups, is a suitable filler for synthesizing polyurethane foam. Therefore, in this study, Kraft lignin (KL) was utilized as a partial substitute for flexible polyethylene glycol 400 (PEG400). After adding 15 % KL, NaCl was introduced as a medium for synthesizing LFPUF and Polydimethylsiloxane (PDMS) was used as a foam stabilizer. Lignin-based flexible polyurethane foam (LFPUF) with high elasticity was synthesized. The aromatic ring structure of KL acted as a reinforcement for the foam, while the flexible PEG400 provided excellent flexibility to LFPUF. Na
+ interacts with oxygen atoms in the long chain of PEG to form a cyclic crown ether structure. This promotes proximity and ordering of the hydroxyl groups, thereby facilitating proton transfer and optimising the cell size of the foam. Ultimately, the foam synthesized with 3 % NaCl (LFPUF-3%NaCl) exhibited an average cell size and hole size of 484.1 and 183.6 μm, respectively, significantly smaller than those of the foam synthesized without NaCl (843.5 and 249.3 μm, respectively). The foam resilience and elastic recovery of LFPUF-3%NaCl were 39.56 and 99.03 %, respectively, which was higher than that of the foam synthesized without NaCl (20.36 % and 97.08 %, respectively). In addition, LFPUF-3%NaCl maintained a high elastic recovery of 97.61 % after 20 cycles of compression. The egg drop test demonstrated that the foam effectively provided protective cushioning for fragile items., Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2025 Elsevier B.V. All rights reserved.)- Published
- 2025
- Full Text
- View/download PDF
29. Overexpression of CBK1 or deletion of SSD1 confers fludioxonil resistance in yeast by suppressing Hog1 activation.
- Author
-
Kundu D, Martoliya Y, Sharma A, Partap Sasan S, Wasi M, Prasad R, and Mondal AK
- Subjects
- Gene Expression Regulation, Fungal drug effects, Gene Deletion, Histidine Kinase genetics, Histidine Kinase metabolism, Fungicides, Industrial pharmacology, Cell Wall metabolism, Cell Wall genetics, Antifungal Agents pharmacology, Saccharomyces cerevisiae Proteins genetics, Saccharomyces cerevisiae Proteins metabolism, Saccharomyces cerevisiae genetics, Saccharomyces cerevisiae metabolism, Pyrroles pharmacology, Mitogen-Activated Protein Kinases metabolism, Mitogen-Activated Protein Kinases genetics, Drug Resistance, Fungal genetics, Dioxoles pharmacology
- Abstract
Group III hybrid histidine kinases (HHK3) are known molecular targets of the widely used fungicidal agent fludioxonil which indirectly converts these kinases to a phosphatase form that causes constitutive activation of Hog1 MAPK. To better understand the fungicidal effect of fludioxonil we have screened S. cerevisiae haploid deletion collection for fludioxonil resistant mutant and identified Ssd1 as a critical factor for this. Deletion of SSD1 not only promoted resistance to fludioxonil but also abrogated Hog1 activation and other cellular damages caused by fludioxonil. Our results showed that fludioxonil perturbed the localization of Cbk1 kinase, an essential protein in yeast, at the bud neck triggering the accumulation of Ssd1 in P-bodies. As a result, localized synthesis of Ssd1 bound mRNA encoding cell wall proteins at the polarized growth site was impaired which created a sustained cell wall stress causing constitutive activation of Hog1. Our data, for the first time, clearly indicated the role of Cbk1 upstream of Hog1 and provided a novel paradigm in the mechanism of action of fludioxonil., Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2024 Elsevier B.V. All rights reserved.)
- Published
- 2025
- Full Text
- View/download PDF
30. Identification of a distinctive immunogenomic gene signature in stage-matched colorectal cancer.
- Author
-
Ahluwalia P, Mondal AK, Vashisht A, Singh H, Alptekin A, Ballur K, Omar N, Ahluwalia M, Jones K, Barrett A, Kota V, and Kolhe R
- Subjects
- Humans, Female, Retrospective Studies, Male, Middle Aged, Aged, Neoplasm Staging, Prognosis, Transcriptome, Gene Expression Profiling methods, Gene Expression Regulation, Neoplastic, Colorectal Neoplasms genetics, Colorectal Neoplasms immunology, Colorectal Neoplasms pathology, Biomarkers, Tumor genetics
- Abstract
Background: Colorectal cancer (CRC) remains one of the leading causes of cancer-related mortality worldwide. Despite advances in diagnosis and treatment, including surgery, chemotherapy, and immunotherapy, accurate clinical markers are still lacking. The development of prognostic and predictive indicators, particularly in the context of personalized medicine, could significantly improve CRC patient management., Method: In this retrospective study, we used FFPE blocks of tissue samples from CRC patients at Augusta University (AU) to quantify a custom 15-gene panel. To differentiate the tumor and adjacent normal regions (NAT), H&E staining was utilized. For the quantification of transcripts, we used the NanoString nCounter platform. Kaplan-Meier and Log-rank tests were used to perform survival analyses. Several independent datasets were explored to validate the gene signature. Orthogonal analyses included single-cell profiling, differential gene expression, immune cell deconvolution, neoantigen prediction, and biological pathway assessment., Results: A 3-gene signature (GTF3A, PKM, and VEGFA) was found to be associated with overall survival in the AU cohort (HR = 2.26, 95% CI 1.05-4.84, p = 0.02, 93 patients), TCGA cohort (HR = 1.57, 95% CI 1.05-2.35, p < 0.02, 435 patients) and four other GEO datasets. Independent single-cell analysis identified relatively higher expression of the 3-gene signature in the tumor region. Differential analysis revealed dysregulated tissue inflammation, immune dysfunction, and neoantigen load of cell cycle processes among high-risk patients compared to low-risk patients., Conclusion: We developed a 3-gene signature with the potential for prognostic and predictive clinical assessment of CRC patients. This gene-based stratification offers a cost-effective approach to personalized cancer management. Further research using similar methods could identify therapy-specific gene signatures to strengthen the development of personalized medicine for CRC patients., Competing Interests: Declarations. Conflcit of interest: The authors declare no competing interests. Ethical Standards: The study was approved by the Institutional Review Board (IRB-HAC # 611298) of Augusta University. Consent to participate: The research was conducted using de-identified samples and no consent was required. Consent for publication: N/A., (© 2024. The Author(s).)
- Published
- 2024
- Full Text
- View/download PDF
31. Electron Spin Polarization and Memory Effect in Supramolecular Gel Exclusively From Achiral Building Blocks.
- Author
-
Nakka N, Garg R, Bisht PS, and Mondal AK
- Abstract
Chirality has been identified as a crucial component in achieving high spin selectivity in organic polymers and π-conjugated molecules. In particular, chiral polymers and supramolecular structures have emerged as promising candidates for spin filtering due to the chirality-induced spin selectivity (CISS) effect. However, the CISS effect in supramolecular systems has not been extensively investigated, despite its potential for applications in spintronics. In this work, for the first time, the potential applications of the CISS effect in supramolecular gel materials and shed light on its untapped possibilities have been successfully explored. The ability of supramolecular gel exclusively made from achiral building blocks to selectively filter electron's spin through the symmetry breaking has been demonstrated. Furthermore, this study shows that their spin filtering efficacy can be improved by using chiral solvents. More importantly, the CISS effect has been employed to explore a novel phenomenon referred to as the "spin memory effect", where the desired spin information is preserved by retaining the helicity even in the absence of the chiral solvent. These findings underscore the immense potential for spintronics applications that rely solely on achiral components, thereby paving the way for new possibilities in device design and functionality., (© 2024 Wiley‐VCH GmbH.)
- Published
- 2024
- Full Text
- View/download PDF
32. Single episode of moderate to severe traumatic brain injury leads to chronic neurological deficits and Alzheimer's-like pathological dementia.
- Author
-
Vaibhav K, Gulhane M, Ahluwalia P, Kumar M, Ahluwalia M, Rafiq AM, Amble V, Zabala MG, Miller JB, Goldman L, Mondal AK, Deak F, Kolhe R, Arbab AS, and Vale FL
- Subjects
- Animals, Mice, Magnetic Resonance Imaging, Male, Dementia etiology, Brain pathology, Brain Injuries, Traumatic pathology, Brain Injuries, Traumatic complications, Brain Injuries, Traumatic physiopathology, Alzheimer Disease pathology, Alzheimer Disease physiopathology, Disease Models, Animal
- Abstract
Traumatic brain injury (TBI) is one of the foremost causes of disability and mortality globally. While the scientific and medical emphasis is to save lives and avoid disability during acute period of injury, a severe health problem can manifest years after injury. For instance, TBI increases the risk of cognitive impairment in the elderly. Remote TBI history was reported to be a cause of the accelerated clinical trajectory of Alzheimer's disease-related dementia (ADRD) resulting in earlier onset of cognitive impairment and increased AD-associated pathological markers like greater amyloid deposition and cortical thinning. It is not well understood whether a single TBI event may increase the risk of dementia. Moreover, the cellular signaling pathways remain elusive for the chronic effects of TBI on cognition. We have hypothesized that a single TBI induces sustained neuroinflammation and disrupts cellular communication in a way that results later in ADRD pathology. To test this, we induced TBI in young adult CD1 mice and assessed the behavioral outcomes after 11 months followed by pathological, histological, transcriptomic, and MRI assessment. On MRI scans, these mice showed significant loss of tissue, reduced CBF, and higher white matter injury compared to sham mice. We found these brains showed progressive atrophy, markers of ADRD, sustained astrogliosis, loss of neuronal plasticity, and growth factors even after 1-year post-TBI. Because of progressive neurodegeneration, these mice had motor deficits, showed cognitive impairments, and wandered randomly in open field. We, therefore, conclude that progressive pathology after adulthood TBI leads to neurodegenerative conditions such as ADRD and impairs neuronal functions., (© 2024. The Author(s), under exclusive licence to American Aging Association.)
- Published
- 2024
- Full Text
- View/download PDF
33. Optical genome mapping identifies hidden structural variation in acute myeloid leukemia: Two case reports.
- Author
-
Singh H, Sahajpal NS, Gupta V, Farmaha J, Vashisht A, Mondal AK, and Kolhe R
- Abstract
Competing Interests: Conflicts of interest The authors declare no conflicts of interest.
- Published
- 2024
- Full Text
- View/download PDF
34. From Genomic Exploration to Personalized Treatment: Next-Generation Sequencing in Oncology.
- Author
-
Vashisht V, Vashisht A, Mondal AK, Woodall J, and Kolhe R
- Abstract
Next-generation sequencing (NGS) has revolutionized personalized oncology care by providing exceptional insights into the complex genomic landscape. NGS offers comprehensive cancer profiling, which enables clinicians and researchers to better understand the molecular basis of cancer and to tailor treatment strategies accordingly. Targeted therapies based on genomic alterations identified through NGS have shown promise in improving patient outcomes across various cancer types, circumventing resistance mechanisms and enhancing treatment efficacy. Moreover, NGS facilitates the identification of predictive biomarkers and prognostic indicators, aiding in patient stratification and personalized treatment approaches. By uncovering driver mutations and actionable alterations, NGS empowers clinicians to make informed decisions regarding treatment selection and patient management. However, the full potential of NGS in personalized oncology can only be realized through bioinformatics analyses. Bioinformatics plays a crucial role in processing raw sequencing data, identifying clinically relevant variants, and interpreting complex genomic landscapes. This comprehensive review investigates the diverse NGS techniques, including whole-genome sequencing (WGS), whole-exome sequencing (WES), and single-cell RNA sequencing (sc-RNA-Seq), elucidating their roles in understanding the complex genomic/transcriptomic landscape of cancer. Furthermore, the review explores the integration of NGS data with bioinformatics tools to facilitate personalized oncology approaches, from understanding tumor heterogeneity to identifying driver mutations and predicting therapeutic responses. Challenges and future directions in NGS-based cancer research are also discussed, underscoring the transformative impact of these technologies on cancer diagnosis, management, and treatment strategies.
- Published
- 2024
- Full Text
- View/download PDF
35. Exploring SARS-CoV-2 infection and vaccine-induced immunity in chronic myeloid leukemia patients: insights from real-world data in Brazil and the United States.
- Author
-
Toreli ACM, Miranda-Galvis M, Sharara M, Addas-Carvalho M, Miranda E, Fechio L, Silva Santos Duarte A, Basso A, Duarte G, Souza Medina S, Pericole F, Benites B, Jones K, Singh H, Farmaha J, Vashisht A, Kolhe R, Mondal AK, Saad STO, de Souza CA, Cortes JE, and Pagnano K
- Subjects
- Humans, Brazil epidemiology, Male, Female, Middle Aged, United States epidemiology, Aged, Adult, Vaccination, Leukemia, Myelogenous, Chronic, BCR-ABL Positive immunology, Leukemia, Myelogenous, Chronic, BCR-ABL Positive epidemiology, COVID-19 immunology, COVID-19 epidemiology, COVID-19 prevention & control, COVID-19 Vaccines immunology, SARS-CoV-2 immunology, Antibodies, Viral blood, Antibodies, Viral immunology
- Abstract
This study investigates COVID-19 outcomes and immune response in chronic myeloid leukemia (CML) patients post-SARS-CoV-2 vaccination, comparing effectiveness of various vaccine options. Data from 118 CML patients (85 in Brazil, 33 in the US) showed similar infection rates prior (14% Brazil, 9.1% US) and post-vaccination (24.7% vs. 27.3%, respectively). In Brazil, AstraZeneca and CoronaVac were the most commonly used vaccine brands, while in the US, Moderna and Pfizer-BioNTech vaccines dominated. Despite lower seroconversion in the Brazilian cohort, all five vaccine brands analyzed prevented severe COVID-19. Patients who received mRNA and recombinant viral vector vaccines (HR: 2.20; 95%CI 1.07-4.51; p < .031) and those that had achieved at least major molecular response (HR: 1.51; 95% CI 1.01-3.31; p < .0001) showed higher seroconversion rates. Our findings suggest that CML patients can generate antibody responses regardless of the vaccine brand, thereby mitigating severe COVID-19. This effect is more pronounced in patients with well-controlled disease.
- Published
- 2024
- Full Text
- View/download PDF
36. Flexible high electrochemical collagen/lignin composite hydrogel for sensing and supercapacitor applications.
- Author
-
Alam MA, Debnath A, Uddin MT, Tamanna A, Kamruzzaman S, Begum HA, Ray SK, Fatima S, Khan AA, Tang Z, and Mondal AK
- Subjects
- Electric Conductivity, Electrochemical Techniques, Tensile Strength, Lignin chemistry, Hydrogels chemistry, Electric Capacitance, Collagen chemistry
- Abstract
Synthesis of polymer-based highly conductive hydrogels from natural and renewable sources with robust mechanical performances in flexible electronics remains a great challenge. In this research, a dynamic redox system is designed by using collagen (CL), sulfonate lignin (SL), acrylic acid (AA), and Al
3+ to synthesize CL/PAA/SL/Al hydrogels. The formation of effective complexes of Al3+ with the abundant functional groups of CL, SL and PAA, the prepared hydrogel delivers various specific properties, for example, excellent ionic conductivity (4.61 S·m-1 ), stretchability and antimicrobial performance. The CL/PAA/SL/Al hydrogel demonstrates good mechanical strength, while the maximum tensile strength of the hydrogels is ∼604 kPa at a stretching of 1254 %, and the maximum compressive strength is ∼0.45 MPa, with the maximum stretching of 59.6 %. The CL/PAA/SL/Al hydrogel acts as a flexible strain sensor with high sensitivity. Enough hydroxyl and carboxyl groups in the hydrogels are essential for delivering the maximum 191 mV of open circuit voltage (Voc ) rendered during moisture spraying. The supercapacitor assembled from CL/PAA/SL/Al hydrogel manifests specific capacitance (Cs ), maximum energy density (Ed ) and power density (Pd ) of 268.75 F·g-1 , 23.89 Wh·kg-1 and 2.4 kW·kg-1 , respectively. The supercapacitor can retain its capacitance of 95.8 % after 5000 consecutive charge-discharge cycles., Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2024 Elsevier B.V. All rights reserved.)- Published
- 2024
- Full Text
- View/download PDF
37. Superfast, large-scale harvesting of cellulose molecules via ethanol pre-swelling engineering of natural fibers.
- Author
-
Jiang J, Zhang Q, Luo X, Cheng B, Chen Q, Yang J, Huang L, Mondal AK, Yuan Z, Chen L, and Li J
- Abstract
Cellulose molecules, as the basic unit of biomass cellulose, have demonstrated advancements in versatile engineering and modification of cellulose toward sustainable and promising materials in our low-carbon society. However, harvesting high-quality cellulose molecules from natural cellulosic fibers (CF) remains challenging due to strong hydrogen bonds and unique crystalline structure, which limit solvents (such as ionic liquid, IL) transport and diffusion within CF, making the process energy/time-intensively. Herein, we superfast and sustainably engineer biomass fibers into high-performance cellulose molecules via ethanol pre-swelling of CF followed by IL treatment in the microwave (MW) system. Ethanol-pre-swelled cellulosic fibers (SCF) feature modified morphological and structural distinctions, with improved fiber width, pore size, and specific surface area. The ethanol in the SCF structure is appropriately removed through MW heating and cooling, leaving transport and diffusion pathways of IL within the SCF. Such strategy enables the superfast (140 s) and large-scale (kilogram level) harvesting of cellulose molecules with high molecular weight, resulting in high-performance, versatile cellulose ionogel with a 300 % increase in strength and 1027 % in toughness, monitoring human movement, external pressure, and temperature. Our strategy paves the way for time/energy-effectively, sustainably harvesting high-quality polymer molecules from natural sources beyond cellulose toward versatile and advanced materials., Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2024 Elsevier Ltd. All rights reserved.)
- Published
- 2024
- Full Text
- View/download PDF
38. The chirality-induced spin selectivity effect in asymmetric spin transport: from solution to device applications.
- Author
-
Gupta R, Balo A, Garg R, Mondal AK, Ghosh KB, and Chandra Mondal P
- Abstract
The chirality-induced spin selectivity (CISS) effect has garnered significant interest in the field of molecular spintronics due to its potential to create spin-polarized electrons without the need for a magnet. Recent studies devoted to CISS effects in various chiral materials demonstrate exciting prospects for spintronics, chiral recognition, and quantum information applications. Several experimental studies have confirmed the applicability of chiral molecules in spin-filtering properties, influencing spin-polarized electron transport and photoemission. Researchers aim to predict CISS phenomena and apply this concept to practical applications by compiling experimental results. To expand the possibilities of spin manipulation and create new opportunities for spin-based technologies, researchers are diligently exploring different chiral organic and inorganic materials for probing the CISS effect. This ongoing research holds promise for developing novel spin-based technologies and advancing the understanding of the intricate relationship between chirality and electron spin. The review highlights the remarkable experimental and theoretical frameworks related to the CISS effect, its impact on spintronics, and its relevance in other scientific areas., Competing Interests: The authors declare no competing interests related to this work., (This journal is © The Royal Society of Chemistry.)
- Published
- 2024
- Full Text
- View/download PDF
39. Dual Signature of Chirality Induced Spin Selectivity through Spontaneous Resolution of 2D Metal-Organic Frameworks.
- Author
-
Garg R, Bisht PS, Sahoo SC, and Mondal AK
- Abstract
The Chiral-Induced Spin Selectivity (CISS) effect has emerged as a fascinating phenomenon within the realm of electron's spin manipulation, showcasing a unique interplay between electron's spin and molecular chirality. Subsequent to its discovery, researchers have been actively involved in exploring the new chiral molecules as effective spin filters. In the realm of observing the CISS effect, the conventional approach has mandated the utilization of two distinct enantiomers of chiral molecules. However, this present study represents a significant advancement by demonstrating the ability to control both spin states of electrons in a single system. In this work, we have demonstrated the preparation of chiral metal-organic frameworks (MOFs) via a "spontaneous resolution" process, obviating the requirement for chiral sources. This resulted in the production of chiral crystals exhibiting opposite handedness (1P and 1M) and these crystals were subsequently employed as a new class of spin filters based on CISS effect. Remarkably, this work signifies the first instance of achieving dual signature of spin selectivity from a single and exclusively achiral system through a spontaneous resolution process. This holds immense potential as it facilitates the production of two distinct spin-filtering materials from a unified system. Furthermore, we investigated the contact potential differences (CPD) of these chiral crystals and, for the first time, associated it with the preferential spin transport properties. Our findings revealed a correlation between the CPD and the chirality of the crystals, as well as the magnetization orientations of the ferromagnetic substrate, which can be elucidated by the CISS effect. In overall, the significant findings achieved using these robust and easily synthesized MOF crystals without the requirement for chiral medium represent a crucial advancement in enhancing the effectiveness of spin filtering materials to produce spintronic devices., (© 2024 Wiley-VCH GmbH.)
- Published
- 2024
- Full Text
- View/download PDF
40. Total Synthesis of the Dimeric Phytocannabinoid Cannabitwinol (CBD Dimer) and Its Analogues.
- Author
-
Shete SS, Mondal AK, and Reddy DS
- Subjects
- Molecular Structure, Stereoisomerism, Cannabis chemistry, Dimerization, Cannabinoids chemical synthesis, Cannabinoids chemistry
- Abstract
A new synthetic route to access the natural product phytocannabinoid cannabitwinol ( 1 ) starting from commercially available raw materials is disclosed. We have also demonstrated the synthesis of other related dimers, including their enantiomers, using the present sequence. This route avoids the legal constraints concerning the acquisition of cannabis plant material or CBD.
- Published
- 2024
- Full Text
- View/download PDF
41. Temperature Sensitive Glutamate Gating of AMPA-subtype iGluRs.
- Author
-
Mondal AK, Carrillo E, Jayaraman V, and Twomey EC
- Abstract
Ionotropic glutamate receptors (iGluRs) are tetrameric ligand-gated ion channels that mediate the majority of excitatory neurotransmission
1 . iGluRs are gated by glutamate, where upon glutamate binding, they open their ion channels to enable cation influx into post-synaptic neurons, initiating signal transduction2 . The structural mechanism of iGluR gating by glutamate has been extensively studied in the context of positive allosteric modulators (PAMs)3-15 . A fundamental question has remained - are the PAM activated states of iGluRs representative of glutamate gating in the absence of PAMs? Here, using the α-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid subtype iGluR (AMPAR) we show that glutamate gating is unique from gating in the presence of PAMs. We demonstrate that glutamate gating is temperature sensitive, and through temperature-resolved cryo-electron microscopy (cryo-EM), capture all major glutamate gating states. Physiological temperatures augment channel activation and conductance. Activation by glutamate initiates ion channel opening that involves all ion channel helices hinging away from the pores axis in a motif that is conserved across all iGluRs. Desensitization occurs when the local dimer pairs decouple and enables closure of the ion channel below through restoring the channel hinges and refolding the channel gate. Our findings define how glutamate gates iGluRs, provide foundations for therapeutic design, and point to iGluR gating being temperature sensitive., Competing Interests: Ethics Declarations The authors claim no competing interests.- Published
- 2024
- Full Text
- View/download PDF
42. Enhancing Precision in HIV Treatment: Validation of a Robust Next-Generation Sequencing System for Drug Resistance Mutation Analysis.
- Author
-
Vashisht A, Mondal AK, Vashisht V, Ananth S, Alptekin A, Jones K, Farmaha JK, and Kolhe R
- Abstract
Background: Multidrug-resistant HIV strains challenge treatment efficacy and increase mortality rates. Next-generation sequencing (NGS) technology swiftly detects variants, facilitating personalized antiretroviral therapy., Aim: This study aimed to validate the Vela Diagnostics NGS platform for HIV drug resistance mutation analysis, rigorously assessed with clinical samples and CAP proficiency testing controls previously analyzed by Sanger sequencing., Method: The experimental approach involved the following: RNA extraction from clinical specimens, reverse transcription polymerase chain reaction (RT-PCR) utilizing the Sentosa SX 101 platform, library preparation with the Sentosa SQ HIV Genotyping Assay, template preparation, sequencing using the Sentosa SQ301 instrument, and subsequent data analysis employing the Sentosa SQ Suite and SQ Reporter software. Drug resistance profiles were interpreted using the Stanford HIV Drug Resistance Database (HIVdb) with the HXB2 reference sequence., Results: The Vela NGS system successfully identified a comprehensive array of drug resistance mutations across the tested samples: 28 nucleoside reverse transcriptase inhibitors (NRTI), 25 non-nucleoside reverse transcriptase inhibitors (NNRTI), 25 protease inhibitors (PI), and 10 integrase gene-specific variants. Dilution experiments further validated the system's sensitivity, detecting drug resistance mutations even at viral loads lower than the recommended threshold (1000 copies/mL) set by Vela Diagnostics., Scope: This study underscores the validation and clinical applicability of the Vela NGS system, and its implementation may offer clinicians enhanced precision in therapeutic decision-making for individuals living with HIV.
- Published
- 2024
- Full Text
- View/download PDF
43. Using magnons as a quantum technology platform: a perspective.
- Author
-
Pal PK, Mondal AK, and Barman A
- Abstract
Traditional electronics rely on charge currents for controlling and transmitting information, resulting in energy dissipation due to electron scattering. Over the last decade, magnons, quanta of spin waves, have emerged as a promising alternative. This perspective article provides a brief review of experimental and theoretical studies on quantum and hybrid magnonics resulting from the interaction of magnons with other quasiparticles in the GHz frequency range, offering insights into the development of functional magnonic devices. In this process, we discuss recent advancements in the quantum theory of magnons and their coupling with various types of qubits in nanoscale ferromagnets, antiferromagnets, synthetic antiferromagnets, and magnetic bulk systems. Additionally, we explore potential technological platforms that enable new functionalities in magnonics, concluding with future directions and emerging phenomena in this burgeoning field., (© 2024 IOP Publishing Ltd.)
- Published
- 2024
- Full Text
- View/download PDF
44. Epigenome-metabolism nexus in the retina: implications for aging and disease.
- Author
-
Mondal AK, Gaur M, Advani J, and Swaroop A
- Subjects
- Humans, Macular Degeneration genetics, Macular Degeneration metabolism, Animals, Gene Expression Regulation genetics, Epigenomics, Glaucoma genetics, Glaucoma metabolism, DNA Methylation genetics, Aging genetics, Aging metabolism, Epigenome genetics, Retina metabolism, Epigenesis, Genetic
- Abstract
Intimate links between epigenome modifications and metabolites allude to a crucial role of cellular metabolism in transcriptional regulation. Retina, being a highly metabolic tissue, adapts by integrating inputs from genetic, epigenetic, and extracellular signals. Precise global epigenomic signatures guide development and homeostasis of the intricate retinal structure and function. Epigenomic and metabolic realignment are hallmarks of aging and highlight a link of the epigenome-metabolism nexus with aging-associated multifactorial traits affecting the retina, including age-related macular degeneration and glaucoma. Here, we focus on emerging principles of epigenomic and metabolic control of retinal gene regulation, with emphasis on their contribution to human disease. In addition, we discuss potential mitigation strategies involving lifestyle changes that target the epigenome-metabolome relationship for maintaining retinal function., Competing Interests: Declaration of interests The authors declare no competing interests., (Published by Elsevier Ltd.)
- Published
- 2024
- Full Text
- View/download PDF
45. Clinical Utility of Optical Genome Mapping for Improved Cytogenomic Analysis of Gliomas.
- Author
-
Singh H, Sahajpal NS, Mondal AK, Burke SL, Farmaha J, Alptekin A, Vashisht A, Jones K, Vashisht V, and Kolhe R
- Abstract
A glioma is a solid brain tumor which originates in the brain or brain stem area. The diagnosis of gliomas based on standard-of-care (SOC) techniques includes karyotyping, fluorescence in situ hybridization (FISH), and chromosomal microarray (CMA), for detecting the pathogenic variants and chromosomal abnormalities. But these techniques do not reveal the complete picture of genetic complexity, thus requiring an alternative technology for better characterization of these tumors. The present study aimed to evaluate the clinical performance and feasibility of using optical genome mapping (OGM) for chromosomal characterization of gliomas. Herein, we evaluated 10 cases of gliomas that were previously characterized by CMA. OGM analysis showed concordance with the results of CMA in identifying the characterized Structural Variants (SVs) in these cases. More notably, it also revealed additional clinically relevant aberrations, demonstrating a higher resolution and sensitivity. These clinically relevant SVs included cryptic translocation, and SVs which are beyond the detection capabilities of CMA. Our analysis highlights the unique capability of OGM to detect all classes of SVs within a single assay, thereby unveiling clinically significant data with a shorter turnaround time. Adopting this diagnostic tool as a standard of care for solid tumors like gliomas shows potential for improving therapeutic management, potentially leading to more personalized and timely interventions for patients.
- Published
- 2024
- Full Text
- View/download PDF
46. Neurological Complications of COVID-19: Unraveling the Pathophysiological Underpinnings and Therapeutic Implications.
- Author
-
Vashisht A, Vashisht V, Singh H, Ahluwalia P, Mondal AK, Williams C, Farmaha J, Woodall J, and Kolhe R
- Subjects
- Humans, Seizures physiopathology, Seizures virology, Seizures etiology, COVID-19 complications, COVID-19 physiopathology, Nervous System Diseases virology, Nervous System Diseases physiopathology, Nervous System Diseases etiology, SARS-CoV-2
- Abstract
Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), the causative agent of coronavirus disease (COVID-19), induced a global pandemic with a diverse array of clinical manifestations. While the acute phase of the pandemic may be waning, the intricacies of COVID-19's impact on neurological health remain a crucial area of investigation. Early recognition of the spectrum of COVID-19 symptoms, ranging from mild fever and cough to life-threatening respiratory distress and multi-organ failure, underscored the significance of neurological complications, including anosmia, seizures, stroke, disorientation, encephalopathy, and paralysis. Notably, patients requiring intensive care unit (ICU) admission due to neurological challenges or due to them exhibiting neurological abnormalities in the ICU have shown increased mortality rates. COVID-19 can lead to a range of neurological complications such as anosmia, stroke, paralysis, cranial nerve deficits, encephalopathy, delirium, meningitis, seizures, etc., in affected patients. This review elucidates the burgeoning landscape of neurological sequelae associated with SARS-CoV-2 infection and explores the underlying neurobiological mechanisms driving these diverse manifestations. A meticulous examination of potential neuroinvasion routes by SARS-CoV-2 underscores the intricate interplay between the virus and the nervous system. Moreover, we dissect the diverse neurological manifestations emphasizing the necessity of a multifaceted approach to understanding the disease's neurological footprint. In addition to elucidating the pathophysiological underpinnings, this review surveys current therapeutic modalities and delineates prospective avenues for neuro-COVID research. By integrating epidemiological, clinical, and diagnostic parameters, we endeavor to foster a comprehensive analysis of the nexus between COVID-19 and neurological health, thereby laying the groundwork for targeted therapeutic interventions and long-term management strategies.
- Published
- 2024
- Full Text
- View/download PDF
47. Femtosecond Laser-Induced Transient Magnetization Enhancement and Ultrafast Demagnetization Mediated by Domain Wall Origami.
- Author
-
Mondal AK, Mukhopadhyay S, Heinig P, Salikhov R, Hellwig O, and Barman A
- Abstract
Femtosecond laser-induced ultrafast magnetization dynamics are all-optically probed for different remanent magnetic domain states of a [Co/Pt]
22 multilayer sample, thus revealing the tunability of the direct transport of spin angular momentum across domain walls. A variety of different magnetic domain configurations (domain wall origami) at remanence achieved by applying different magnetic field histories are investigated by time-resolved magneto-optical Kerr effect magnetometry to probe the ultrafast magnetization dynamics. Depending on the underlying domain landscape, the spin-transport-driven magnetization dynamics show a transition from typical ultrafast demagnetization to being fully dominated by an anomalous transient magnetization enhancement (TME) via a state in which both TME and demagnetization coexist in the system. Thereby, the study reveals an extrinsic channel for the modulation of spin transport, which introduces a route for the development of magnetic spin-texture-driven ultrafast spintronic devices.- Published
- 2024
- Full Text
- View/download PDF
48. Development of lignin hydrogel reinforced polypyrrole rich electrode material for supercapacitor and sensing applications.
- Author
-
Lin W, Han H, Yan X, Xie J, He H, Han S, Ning D, Mondal AK, Wu S, and Huang F
- Subjects
- Electric Conductivity, Electrochemical Techniques methods, Pyrroles chemistry, Lignin chemistry, Polymers chemistry, Electrodes, Electric Capacitance, Hydrogels chemistry
- Abstract
The preparation of natural polymer-based highly conductive hydrogels with reliable durability for applications in supercapacitors (SCs) is still challenging. Herein, a facile method to prepare alkaline lignin (AL)-based polypyrrole (PPy)-rich, high-conductive PPy@AL/PEGDGE gel was reported, where AL was used as a dopant, polyethylene glycol diglycidyl ether (PEGDGE) as a cross-linking agent, and PPy as a conducting polymer. The PPy@AL/PEGDGE gel electrode materials with hollow structures were prepared by electrochemical deposition and chemical etching method and then assembled into sandwich-shaped SCs. Cyclic voltammetry (CV), galvanotactic charge discharge (GCD), electrochemical impedance spectroscopy (EIS) and cycling stability tests of the PPy@AL/PEGDGE SCs were performed. The results demonstrated that the SCs can achieve a conductivity of 25.9 S·m
-1 and a specific capacitance of 175 F·g-1 , which was 127.4 % higher compared to pure PPy (77 F·g-1 ) electrode. The highest energy density and power density for the SCs were obtained at 23.06 Wh·kg-1 and 5376 W·kg-1 , respectively. In addition, the cycling performance was also higher than that of pure PPy assembled SCs (50 %), and the capacitance retention rate can reach 72.3 % after 1000 cycles. The electrode materials are expected to be used as sensor and SCs devices., Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2024 Elsevier B.V. All rights reserved.)- Published
- 2024
- Full Text
- View/download PDF
49. Assessment of knowledge, attitudes, and practices on vaccine usage among small ruminant farmers in the Northern Region of Bangladesh.
- Author
-
Islam MS, Mondal AK, Auwul MR, Islam T, Islam O, Yasmin A, Mahmud MAA, Haque AKMZ, Begum M, Tipu JH, Mojumder Y, Roy M, and Islam MA
- Abstract
Background and Aim: Small ruminants require vaccines to prevent and manage diseases. Unfortunately, no studies have been conducted in Bangladesh to assess the knowledge, attitudes, and practices (KAP) of small ruminant farmers (SRF) regarding vaccine use against infectious diseases, affecting the success of vaccination campaigns. The present study aims to assess SRF's KAP regarding vaccines, revealing gaps and barriers to efficient vaccination., Materials and Methods: Two hundred and twenty-eight SRF in northern Bangladesh were surveyed in a cross-sectional study. Data were collected from random participants through face-to-face interviews using a structured questionnaire. KAP levels were categorized as "good" or "poor" and "positive" or "negative" using a scoring method with a 60% cutoff. The analysis comprised the utilization of descriptive statistics as well as logistic regression models., Results: Results showed that most participants were female (60.5%), aged 31-40 (34.2%), with secondary education (28.1%), and vaccination training (22.8%). While 75% knew about vaccines, only 37.3% understood their role in preventing infectious diseases, and 63.6% in reducing antibiotic use 68.4% of farmers were aware of negative drawbacks, and 61.8% reported vaccinating their herds. About 42.1% of the farmers had good knowledge, 52.6% had a positive attitude, and 22.8% followed good practices. Female farmers with graduate degrees and 6-10 years of goat farming experience, but not those with vaccination training, demonstrated stronger knowledge. Female farmers with a graduate degree and 6-10 years of goat farming experience displayed positive attitudes. Female goat farmers from Thakurgaon had a higher likelihood of following good vaccination practices than those with vaccination training., Conclusion: The study unearths disparities in KAP scores among farmers. To effectively address KAP gaps concerning vaccine usage and prevent potential infectious diseases, it is essential to design focused educational and training programs. About 52.6% of SRF hold a positive view toward vaccines., Competing Interests: The authors declare that they have no competing interests., (Copyright: © Islam, et al.)
- Published
- 2024
- Full Text
- View/download PDF
50. Spin Filtering and Amplification in Self-Assembled Nanofibers Based on Chiral Asymmetric Building Blocks.
- Author
-
Singh Bisht P, Garg R, Nakka N, and Mondal AK
- Abstract
The cooperativity in artificial self-assembling systems can be enhanced to expand their applications and redesign their properties. Recently, chiral molecules have garnered renewed attention due to their potential as highly efficient spin filters through the chiral-induced spin selectivity (CISS) effect. However, the potential of asymmetric building blocks based on chiral perylene diimides (PDIs) self-assembled materials to generate a spin-polarized current is still not widely acknowledged. In this work, we have demonstrated that nanofibers derived from "asymmetric PDIs" molecules have been found to exhibit promising spin-filtering property and the amplification of spin polarization at room temperature. Also, the exploration of chiral amplification and correlating it with the amplification of spin polarization have been reported for the first time through this work. These findings underscore the significance of self-assembled materials in the realm of spintronics, as they offer fascinating platforms with evolving structure-property relationship. It also provides the feasible possibility of enhancing the CISS-based spintronic devices that can accomplish controllability and high spin-filtering efficiency simultaneously.
- Published
- 2024
- Full Text
- View/download PDF
Catalog
Discovery Service for Jio Institute Digital Library
For full access to our library's resources, please sign in.