1
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Mondal AK, Maiti AK, Chattopadhyay S, Bhar D. A randomised, double-blind, comparative study of preoperative magnesium sulphate versus zinc sulphate gargle for prevention of postoperative sore throat following endotracheal intubation. Indian J Anaesth 2023; 67:S261-S267. [PMID: 38187966 PMCID: PMC10768894 DOI: 10.4103/ija.ija_975_22] [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: 11/30/2022] [Revised: 09/21/2023] [Accepted: 09/22/2023] [Indexed: 01/09/2024] Open
Abstract
Background and Aims Magnesium sulphate and zinc sulphate have been reported to attenuate postoperative sore throat (POST). The study aims to compare the effect of preoperative magnesium sulphate and zinc sulphate gargle on the incidence and severity of POST following endotracheal intubation within 24 h. Methods After ethics committee approval, 132 patients were randomly allocated to three groups (M, Z and D). Fifteen minutes before laryngoscopy and tracheal intubation, patients assigned to groups M and Z received a solution for gargle containing magnesium sulphate 20 mg/kg and zinc sulphate containing 40 mg of elemental zinc dissolved in 20 ml of 5% dextrose solution, respectively. Group D received 20 ml of 5% dextrose solution. Incidence and severity of POST (4-point score: Grade 0- no sore throat, Grade 1- mild sore throat, Grade 2- moderate sore throat, Grade 3- severe sore throat) was assessed for 24 h after extubation. Statistica, Version 8.0 (StatSoft, Inc., Tulsa, Oklahoma, USA) was used for analysing the data. Results The lowest incidence of POST in group M was 13.6% (95% confidence interval [CI] 3.5-23.7) compared to 0% in group Z, whereas the highest incidence recorded in group M was 25% (95% CI 12.2-37.7) in contrast to 13.6% (95% CI 3.5-23.7) in group Z during the first 24 h after operation. It was observed that the incidence of mild POST (POST score 1) was significantly lower (P < 0.05) in group Z compared to group M in the first 4 h postoperatively. Conclusion Zinc sulphate gargle before laryngoscopy and tracheal intubation is more effective for reducing the incidence of POST than magnesium sulphate gargle.
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Affiliation(s)
- Amit Kumar Mondal
- Department of Anaesthesiology, Midnapore Medical College, Vidyasagar Road, Midnapore, Paschim Medinipur, West Bengal, India
| | - Asim Kumar Maiti
- Department of Anaesthesiology, Midnapore Medical College, Vidyasagar Road, Midnapore, Paschim Medinipur, West Bengal, India
| | - Suman Chattopadhyay
- Department of Anaesthesiology, Midnapore Medical College, Vidyasagar Road, Midnapore, Paschim Medinipur, West Bengal, India
| | - Debasish Bhar
- Department of Anaesthesiology, Midnapore Medical College, Vidyasagar Road, Midnapore, Paschim Medinipur, West Bengal, India
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2
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Kumar Das T, Mondal AK, Tiwari OS, Makam P, Leitus G, Gazit E, Claudio F, Naaman R. Spin-induced electron transmission through metal-organic chiral crystals. Phys Chem Chem Phys 2023; 25:22124-22129. [PMID: 37563955 DOI: 10.1039/d3cp02579a] [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: 08/12/2023]
Abstract
Metal-organic Co(II)-phenylalanine crystals were studied and were found to possess magnetic properties and long-range spin transport. Magnetic measurements confirmed that in the crystals there are antiferromagnetic interactions between Co(II) and the lattice. The metal-organic crystals (MOCs) also present the chirality-induced spin selectivity (CISS) effect at room temperature. A long-range spin polarization is observed using a magnetic conductive-probe atomic force microscope. The spin polarization is found to be in the range of 35-45%.
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Affiliation(s)
- Tapan Kumar Das
- Department of Chemical and Biological Physics, Weizmann Institute of Science, Rehovot, 7610001, Israel.
| | - Amit Kumar Mondal
- Department of Chemical and Biological Physics, Weizmann Institute of Science, Rehovot, 7610001, Israel.
- Institute of Nano Science and Technology (INST), Sector-81, Mohali 140306, Punjab, India
| | - Om Shanker Tiwari
- The Shmunis School of Biomedicine and Cancer Research, The George S. Wise Faculty of Life Sciences, Tel Aviv University, Tel Aviv 6997801, Israel
| | - Pandeeswar Makam
- The Shmunis School of Biomedicine and Cancer Research, The George S. Wise Faculty of Life Sciences, Tel Aviv University, Tel Aviv 6997801, Israel
| | - Gregory Leitus
- Chemical Research Support, Weizmann Institute of Science, Rehovot, 7610001, Israel
| | - Ehud Gazit
- The Shmunis School of Biomedicine and Cancer Research, The George S. Wise Faculty of Life Sciences, Tel Aviv University, Tel Aviv 6997801, Israel
| | - Fontanesi Claudio
- Department of Engineering "Enzo Ferrari," University of Modena and Reggio Emilia, Modena 41125, Italy
| | - Ron Naaman
- Department of Chemical and Biological Physics, Weizmann Institute of Science, Rehovot, 7610001, Israel.
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3
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Mondal AK, Pan X, Kwon O, Vardeny ZV. Degradation Analysis of Organic Light-Emitting Diodes through Dispersive Magneto-Electroluminescence Response. ACS Appl Mater Interfaces 2023; 15:9697-9704. [PMID: 36749918 DOI: 10.1021/acsami.2c20070] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
Understanding the stability and degradation of organic light-emitting diodes (OLEDs) under working conditions is a significant area of research for developing more effective OLEDs and further improving their performance. However, studies of degradation processes by in situ noninvasive methods have not been adequately developed. In this work, tris-(8-hydroxyquinolino) aluminum (Alq3)-based OLED degradation processes have been analyzed through the investigation of the device dispersive magneto-electroluminescence (MEL(B)) response measured at room temperature. By studying the change in the MEL(B) response during the device degradation under different external stimuli, such as exposing the device to the atmosphere and prolonged illumination by a strong visible light source, we have gained insight into the microscopic spin-dependent phenomena that control the recombination of e-h polaron pairs in the device. We found that the device degradation leads to a shorter e-h polaron lifetime, smaller dispersive parameter, and broader lifetime distribution function that shows increased disorder in the active layer. This study could offer a potential tool that may be beneficial for assessing the degradation of OLED devices based on various active layers.
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Affiliation(s)
- Amit Kumar Mondal
- Department of Physics & Astronomy, University of Utah, Salt Lake City, Utah 84112, United States
| | - Xin Pan
- Department of Physics & Astronomy, University of Utah, Salt Lake City, Utah 84112, United States
| | - Ohyun Kwon
- Samsung Advanced Institute of Technology, Samsung Electronics Co., Ltd., 130, Samsung-Ro, Yeongtong-gu, Suwon-Si 16678, Gyeonggi-do, Republic of Korea
| | - Zeev Valy Vardeny
- Department of Physics & Astronomy, University of Utah, Salt Lake City, Utah 84112, United States
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4
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Bhowmick DK, Das TK, Santra K, Mondal AK, Tassinari F, Schwarz R, Diesendruck CE, Naaman R. Spin-induced asymmetry reaction-The formation of asymmetric carbon by electropolymerization. Sci Adv 2022; 8:eabq2727. [PMID: 35947656 PMCID: PMC9365291 DOI: 10.1126/sciadv.abq2727] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/29/2022] [Accepted: 06/27/2022] [Indexed: 06/09/2023]
Abstract
We describe the spin polarization-induced chirogenic electropolymerization of achiral 2-vinylpyridine, which forms a layer of enantioenhanced isotactic polymer on the electrode. The product formed is enantioenriched in asymmetric carbon polymer. To confirm the chirality of the polymer film formed on the electrode, we also measured its electron spin polarization properties as a function of its thickness. Two methods were used: First, spin polarization was measured by applying magnetic contact atomic force microscopy, and second, magnetoresistance was assessed in a sandwich-like four-point contact structure. We observed high spin-selective electron transmission, even for a layer thickness of 120 nm. A correlation exists between the change in the circular dichroism signal and the change in the spin polarization, as a function of thickness. The spin-filtering efficiency increases with temperature.
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Affiliation(s)
- Deb Kumar Bhowmick
- Department of Chemical and Biological Physics, Weizmann Institute, Rehovot 7610001, Israel
| | - Tapan Kumar Das
- Department of Chemical and Biological Physics, Weizmann Institute, Rehovot 7610001, Israel
| | - Kakali Santra
- Department of Chemical and Biological Physics, Weizmann Institute, Rehovot 7610001, Israel
| | - Amit Kumar Mondal
- Department of Chemical and Biological Physics, Weizmann Institute, Rehovot 7610001, Israel
| | - Francesco Tassinari
- Department of Chemical and Biological Physics, Weizmann Institute, Rehovot 7610001, Israel
- Department of Chemical and Geological Sciences, University of Modena and Reggio Emilia, Via Campi 103, 41125 Modena, Italy
| | - Rony Schwarz
- Schulich Faculty of Chemistry, Technion, Israel Institute of Technology, Haifa, 3200008 Israel
| | - Charles E. Diesendruck
- Schulich Faculty of Chemistry, Technion, Israel Institute of Technology, Haifa, 3200008 Israel
| | - Ron Naaman
- Department of Chemical and Biological Physics, Weizmann Institute, Rehovot 7610001, Israel
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5
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Zhu Q, Danowski W, Mondal AK, Tassinari F, van Beek CLF, Heideman GH, Santra K, Cohen SR, Feringa BL, Naaman R. Multistate Switching of Spin Selectivity in Electron Transport through Light-Driven Molecular Motors. Adv Sci (Weinh) 2021; 8:e2101773. [PMID: 34292678 PMCID: PMC8456272 DOI: 10.1002/advs.202101773] [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] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/28/2021] [Revised: 06/10/2021] [Indexed: 05/25/2023]
Abstract
It is established that electron transmission through chiral molecules depends on the electron's spin. This phenomenon, termed the chiral-induced spin selectivity (CISS), effect has been observed in chiral molecules, supramolecular structures, polymers, and metal-organic films. Which spin is preferred in the transmission depends on the handedness of the system and the tunneling direction of the electrons. Molecular motors based on overcrowded alkenes show multiple inversions of helical chirality under light irradiation and thermal relaxation. The authors found here multistate switching of spin selectivity in electron transfer through first generation molecular motors based on the four accessible distinct helical configurations, measured by magnetic-conductive atomic force microscopy. It is shown that the helical state dictates the molecular organization on the surface. The efficient spin polarization observed in the photostationary state of the right-handed motor coupled with the modulation of spin selectivity through the controlled sequence of helical states, opens opportunities to tune spin selectivity on-demand with high spatio-temporal precision. An energetic analysis correlates the spin injection barrier with the extent of spin polarization.
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Affiliation(s)
- Qirong Zhu
- Department of Chemical and Biological PhysicsWeizmann Institute of ScienceRehovot76100Israel
| | - Wojciech Danowski
- Centre for Systems ChemistryStratingh Institute for ChemistryUniversity of GroningenNijenborgh 4Groningen9747 AGThe Netherlands
| | - Amit Kumar Mondal
- Department of Chemical and Biological PhysicsWeizmann Institute of ScienceRehovot76100Israel
| | - Francesco Tassinari
- Department of Chemical and Biological PhysicsWeizmann Institute of ScienceRehovot76100Israel
| | - Carlijn L. F. van Beek
- Centre for Systems ChemistryStratingh Institute for ChemistryUniversity of GroningenNijenborgh 4Groningen9747 AGThe Netherlands
| | - G. Henrieke Heideman
- Centre for Systems ChemistryStratingh Institute for ChemistryUniversity of GroningenNijenborgh 4Groningen9747 AGThe Netherlands
| | - Kakali Santra
- Department of Chemical and Biological PhysicsWeizmann Institute of ScienceRehovot76100Israel
| | - Sidney R. Cohen
- Chemical Research SupportWeizmann Institute of ScienceRehovot76100Israel
| | - Ben L. Feringa
- Centre for Systems ChemistryStratingh Institute for ChemistryUniversity of GroningenNijenborgh 4Groningen9747 AGThe Netherlands
| | - Ron Naaman
- Department of Chemical and Biological PhysicsWeizmann Institute of ScienceRehovot76100Israel
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6
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Mondal AK, Preuss MD, Ślęczkowski ML, Das TK, Vantomme G, Meijer EW, Naaman R. Spin Filtering in Supramolecular Polymers Assembled from Achiral Monomers Mediated by Chiral Solvents. J Am Chem Soc 2021; 143:7189-7195. [PMID: 33926182 PMCID: PMC8297732 DOI: 10.1021/jacs.1c02983] [Citation(s) in RCA: 49] [Impact Index Per Article: 16.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
![]()
In past studies,
spin selective transport was observed in polymers
and supramolecular structures that are based on homochiral building
blocks possessing stereocenters. Here we address the question to what
extent chiral building blocks are required for observing the chiral
induced spin selectivity (CISS) effect. We demonstrate the CISS effect
in supramolecular polymers exclusively containing achiral monomers,
where the supramolecular chirality was induced by chiral solvents
that were removed from the fibers before measuring. Spin-selective
transport was observed for electrons transmitted perpendicular to
the fibers’ long axis. The spin polarization correlates with
the intensity of the CD spectra of the polymers, indicating that the
effect is nonlocal. It is found that the spin polarization increases
with the samples’ thickness and the thickness dependence is
the result of at least two mechanisms: the first is the CISS effect,
and the second reduces the spin polarization due to scattering. Temperature
dependence studies provide the first support for theoretical work
that suggested that phonons may contribute to the spin polarization.
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Affiliation(s)
- Amit Kumar Mondal
- Department of Chemical and Biological Physics, Weizmann Institute of Science, Rehovot 76100, Israel
| | - Marco D Preuss
- Institute for Complex Molecular Systems and Laboratory of Macromolecular and Organic Chemistry, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
| | - Marcin L Ślęczkowski
- Institute for Complex Molecular Systems and Laboratory of Macromolecular and Organic Chemistry, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
| | - Tapan Kumar Das
- Department of Chemical and Biological Physics, Weizmann Institute of Science, Rehovot 76100, Israel
| | - Ghislaine Vantomme
- Institute for Complex Molecular Systems and Laboratory of Macromolecular and Organic Chemistry, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
| | - E W Meijer
- Institute for Complex Molecular Systems and Laboratory of Macromolecular and Organic Chemistry, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
| | - Ron Naaman
- Department of Chemical and Biological Physics, Weizmann Institute of Science, Rehovot 76100, Israel
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7
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Alviña K, Jodeiri Farshbaf M, Mondal AK. Long term effects of stress on hippocampal function: Emphasis on early life stress paradigms and potential involvement of neuropeptide Y. J Neurosci Res 2021; 99:57-66. [PMID: 32162350 DOI: 10.1002/jnr.24614] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2019] [Revised: 02/06/2020] [Accepted: 02/27/2020] [Indexed: 01/06/2023]
Abstract
The brain is both central in orchestrating the response to stress, and, a very sensitive target when such response is not controlled. In fact, stress has long been associated with the onset and/or exacerbation of several neuropsychiatric disorders such as anxiety, depression, and drug addiction. The hippocampus is a key brain region involved in the response to stress, not only due to its anatomical connections with the hypothalamic-pituitary-adrenal axis but also as a major target of stress mediators. The hippocampal dentate gyrus (DG)-CA3 circuit, composed of DG granule cells axons (mossy fibers) synapsing onto CA3 pyramidal cells, plays an essential role in memory encoding and retrieval, functions that are vulnerable to stress. Although naturally excitatory, this circuit is under the inhibitory control of GABAergic interneurons that maintain the excitation/inhibition balance. One subgroup of such interneurons produces neuropeptide Y (NPY), which has emerged as a promising endogenous stress "resilience molecule" due to its anxiolytic and anti-epileptic properties. Here we examine existing evidence that reveals a potential role for hilar NPY+ interneurons in mediating stress-induced changes in hippocampal function. We will focus specifically on rodent models of early life stress (ELS), defined as adverse conditions during the early postnatal period that can have profound consequences for neurodevelopment. Collectively, these findings suggest that the long-lasting effects of ELS might stem from the loss of GABAergic NPY+ cells, which then can lead to reduced inhibition in the DG-CA3 pathway. Such change might then lead to hyperexcitability and concomitant hippocampal-dependent behavioral deficits.
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Affiliation(s)
- Karina Alviña
- Department of Biological Sciences, Texas Tech University, Lubbock, TX, USA
- Department of Neuroscience, University of Florida, Gainesville, FL, USA
| | | | - Amit Kumar Mondal
- Department of Biological Sciences, Texas Tech University, Lubbock, TX, USA
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8
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Gupta A, Singh A, Bharadwaj D, Mondal AK. Humans and Robots: A Mutually Inclusive Relationship in a Contagious World. Int. J. Autom. Comput. 2021; 18. [PMCID: PMC7837077 DOI: 10.1007/s11633-020-1266-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
The Coronavirus global pandemic has spread faster and more severely than experts had anticipated. While this has presented itself as a great challenge, researchers worldwide have shown ingenuity and dexterity in adapting technology and devising new strategies to combat this pandemic. However, implementing these strategies alone impedes the nature of everyone’s daily life. Hence, an intersection between these strategies and the technological advantages of robotics, artificial intelligence, and autonomous systems is essential for near-to-normal operation. In this review paper, different applications of robotic systems, various aspects of modern technologies, including medical imaging, telemedicine, and supply chains, have been covered with respect to the COVID-19 pandemic. Furthermore, concerns over user’s data privacy, job losses, and legal aspects of the implementation of robotics are also been discussed.
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Affiliation(s)
- Akash Gupta
- Department of Mechanical Engineering, University of Petroleum and Energy Studies, Dehradun, 248007 India
| | - Anshuman Singh
- Department of Systems Engineering, University of Maryland, College Park, Maryland 20742 USA
| | - Deepak Bharadwaj
- Department of Mechanical Engineering, University of Petroleum and Energy Studies, Dehradun, 248007 India
| | - Amit Kumar Mondal
- Department of Mechatronics Engineering, Manipal Academy of Higher Education, Dubai, 345050 UAE
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9
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Mondal AK, Brown N, Mishra S, Makam P, Wing D, Gilead S, Wiesenfeld Y, Leitus G, Shimon LJW, Carmieli R, Ehre D, Kamieniarz G, Fransson J, Hod O, Kronik L, Gazit E, Naaman R. Long-Range Spin-Selective Transport in Chiral Metal-Organic Crystals with Temperature-Activated Magnetization. ACS Nano 2020; 14:16624-16633. [PMID: 33095016 PMCID: PMC7760088 DOI: 10.1021/acsnano.0c07569] [Citation(s) in RCA: 34] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/08/2020] [Accepted: 10/13/2020] [Indexed: 05/22/2023]
Abstract
Room-temperature, long-range (300 nm), chirality-induced spin-selective electron conduction is found in chiral metal-organic Cu(II) phenylalanine crystals, using magnetic conductive-probe atomic force microscopy. These crystals are found to be also weakly ferromagnetic and ferroelectric. Notably, the observed ferromagnetism is thermally activated, so that the crystals are antiferromagnetic at low temperatures and become ferromagnetic above ∼50 K. Electron paramagnetic resonance measurements and density functional theory calculations suggest that these unusual magnetic properties result from indirect exchange interaction of the Cu(II) ions through the chiral lattice.
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Affiliation(s)
- Amit Kumar Mondal
- Department
of Chemical and Biological Physics, Weizmann
Institute of Science, Rehovot 76100, Israel
| | - Noam Brown
- School
of Molecular Cell Biology and Biotechnology, George S. Wise Faculty
of Life Sciences, Tel Aviv University, Tel Aviv 6997801, Israel
- Department
of Physical Chemistry, School of Chemistry, Raymond and Beverly Sackler
Faculty of Exact Sciences, Tel Aviv University, Tel Aviv 6997801, Israel
| | - Suryakant Mishra
- Department
of Chemical and Biological Physics, Weizmann
Institute of Science, Rehovot 76100, Israel
| | - Pandeeswar Makam
- School
of Molecular Cell Biology and Biotechnology, George S. Wise Faculty
of Life Sciences, Tel Aviv University, Tel Aviv 6997801, Israel
| | - Dahvyd Wing
- Department
of Materials and Interfaces, Weizmann Institute
of Science, Rehovot 76100, Israel
| | - Sharon Gilead
- School
of Molecular Cell Biology and Biotechnology, George S. Wise Faculty
of Life Sciences, Tel Aviv University, Tel Aviv 6997801, Israel
| | - Yarden Wiesenfeld
- Department
of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6323, United States
| | - Gregory Leitus
- Department
of Chemical Research Support, Weizmann Institute
of Science, Rehovot 76100, Israel
| | - Linda J. W. Shimon
- Department
of Chemical Research Support, Weizmann Institute
of Science, Rehovot 76100, Israel
| | - Raanan Carmieli
- Department
of Chemical Research Support, Weizmann Institute
of Science, Rehovot 76100, Israel
| | - David Ehre
- Department
of Materials and Interfaces, Weizmann Institute
of Science, Rehovot 76100, Israel
| | - Grzegorz Kamieniarz
- Department
of Materials and Interfaces, Weizmann Institute
of Science, Rehovot 76100, Israel
- Faculty
of Physics, A. Mickiewicz University, 61-614 Poznań, Poland
| | - Jonas Fransson
- Department
of Physics and Astronomy, Uppsala University, SE-75237 Uppsala, Sweden
| | - Oded Hod
- Department
of Physical Chemistry, School of Chemistry, Raymond and Beverly Sackler
Faculty of Exact Sciences, Tel Aviv University, Tel Aviv 6997801, Israel
- The
Sackler Center for Computational Molecular and Materials Science, Tel Aviv University, Tel Aviv 6997801, Israel
| | - Leeor Kronik
- Department
of Materials and Interfaces, Weizmann Institute
of Science, Rehovot 76100, Israel
| | - Ehud Gazit
- School
of Molecular Cell Biology and Biotechnology, George S. Wise Faculty
of Life Sciences, Tel Aviv University, Tel Aviv 6997801, Israel
| | - Ron Naaman
- Department
of Chemical and Biological Physics, Weizmann
Institute of Science, Rehovot 76100, Israel
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10
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Mishra S, Mondal AK, Smolinsky EZB, Naaman R, Maeda K, Nishimura T, Taniguchi T, Yoshida T, Takayama K, Yashima E. Spin Filtering Along Chiral Polymers. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202006570] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Suryakant Mishra
- Department of Chemical and Biological Physics Weizmann Institute Rehovot 76100 Israel
| | - Amit Kumar Mondal
- Department of Chemical and Biological Physics Weizmann Institute Rehovot 76100 Israel
| | - Eilam Z. B. Smolinsky
- Department of Chemical and Biological Physics Weizmann Institute Rehovot 76100 Israel
| | - Ron Naaman
- Department of Chemical and Biological Physics Weizmann Institute Rehovot 76100 Israel
| | - Katsuhiro Maeda
- WPI Nano Life Science Institute (WPI-NanoLSI) Kanazawa University Kakuma-machi Kanazawa 920-1192 Japan
- Graduate School of Natural Science and Technology Kanazawa University Kakuma-machi Kanazawa 920-1192 Japan
| | - Tatsuya Nishimura
- Graduate School of Natural Science and Technology Kanazawa University Kakuma-machi Kanazawa 920-1192 Japan
| | - Tsuyoshi Taniguchi
- Graduate School of Natural Science and Technology Kanazawa University Kakuma-machi Kanazawa 920-1192 Japan
| | - Takumu Yoshida
- Graduate School of Natural Science and Technology Kanazawa University Kakuma-machi Kanazawa 920-1192 Japan
| | - Kokoro Takayama
- Graduate School of Natural Science and Technology Kanazawa University Kakuma-machi Kanazawa 920-1192 Japan
| | - Eiji Yashima
- Department of Molecular and Macromolecular Chemistry Graduate School of Engineering Nagoya University Chikusa-ku Nagoya 464-8603 Japan
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11
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Mishra S, Mondal AK, Smolinsky EZB, Naaman R, Maeda K, Nishimura T, Taniguchi T, Yoshida T, Takayama K, Yashima E. Spin Filtering Along Chiral Polymers. Angew Chem Int Ed Engl 2020; 59:14671-14676. [PMID: 32533565 PMCID: PMC7496609 DOI: 10.1002/anie.202006570] [Citation(s) in RCA: 37] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2020] [Revised: 05/28/2020] [Indexed: 11/09/2022]
Abstract
Spin-dependent conduction and polarization in chiral polymers were studied for polymers organized as self-assembled monolayers with conduction along the polymer backbone, namely, along its longer axis. Large spin polarization and magnetoresistance effects were observed, showing a clear dependence on the secondary structure of the polymer. The results indicate that the spin polarization process does not include spin flipping and hence it results from backscattering probabilities for the two spin states.
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Affiliation(s)
- Suryakant Mishra
- Department of Chemical and Biological PhysicsWeizmann InstituteRehovot76100Israel
| | - Amit Kumar Mondal
- Department of Chemical and Biological PhysicsWeizmann InstituteRehovot76100Israel
| | | | - Ron Naaman
- Department of Chemical and Biological PhysicsWeizmann InstituteRehovot76100Israel
| | - Katsuhiro Maeda
- WPI Nano Life Science Institute (WPI-NanoLSI)Kanazawa UniversityKakuma-machiKanazawa920-1192Japan
- Graduate School of Natural Science and TechnologyKanazawa UniversityKakuma-machiKanazawa920-1192Japan
| | - Tatsuya Nishimura
- Graduate School of Natural Science and TechnologyKanazawa UniversityKakuma-machiKanazawa920-1192Japan
| | - Tsuyoshi Taniguchi
- Graduate School of Natural Science and TechnologyKanazawa UniversityKakuma-machiKanazawa920-1192Japan
| | - Takumu Yoshida
- Graduate School of Natural Science and TechnologyKanazawa UniversityKakuma-machiKanazawa920-1192Japan
| | - Kokoro Takayama
- Graduate School of Natural Science and TechnologyKanazawa UniversityKakuma-machiKanazawa920-1192Japan
| | - Eiji Yashima
- Department of Molecular and Macromolecular ChemistryGraduate School of EngineeringNagoya UniversityChikusa-kuNagoya464-8603Japan
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12
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Gupta A, Singh A, Verma V, Mondal AK, Gupta MK. Developments and clinical evaluations of robotic exoskeleton technology for human upper-limb rehabilitation. Adv Robot 2020. [DOI: 10.1080/01691864.2020.1749926] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Akash Gupta
- Department of Mechanical Engineering, University of Petroleum and Energy Studies, Dehradun, India
| | - Anshuman Singh
- Department of Systems Engineering, University of Maryland, College Park, MD, USA
| | - Varnita Verma
- Department of Electrical and Electronics Engineering, University of Petroleum and Energy Studies, Dehradun, India
| | - Amit Kumar Mondal
- Department of Mechatronics Engineering, Manipal University, Dubai, UAE
| | - Mukul Kumar Gupta
- Department of Electrical and Electronics Engineering, University of Petroleum and Energy Studies, Dehradun, India
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13
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Kulkarni C, Mondal AK, Das TK, Grinbom G, Tassinari F, Mabesoone MFJ, Meijer EW, Naaman R. Highly Efficient and Tunable Filtering of Electrons' Spin by Supramolecular Chirality of Nanofiber-Based Materials. Adv Mater 2020; 32:e1904965. [PMID: 31922628 DOI: 10.1002/adma.201904965] [Citation(s) in RCA: 100] [Impact Index Per Article: 25.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/01/2019] [Revised: 11/13/2019] [Indexed: 05/19/2023]
Abstract
Organic semiconductors and organic-inorganic hybrids are promising materials for spintronic-based memory devices. Recently, an alternative route to organic spintronic based on chiral-induced spin selectivity (CISS) is suggested. In the CISS effect, the chirality of the molecular system itself acts as a spin filter, thus avoiding the use of magnets for spin injection. Here, spin filtering in excess of 85% in helical π-conjugated materials based on supramolecular nanofibers at room temperature is reported. The high spin-filtering efficiency can even be observed in nanofibers assembled from mixtures of chiral and achiral molecules through chiral amplification effect. Furthermore and most excitingly, it is shown that both "up" and "down" orientations of filtered spins can be obtained in a single enantiopure system via the temperature-dependent helicity (P and M) inversion of supramolecular nanofibers. The findings showcase that materials based on helical noncovalently assembled systems are modular platforms with an emerging structure-property relationship for spintronic applications.
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Affiliation(s)
- Chidambar Kulkarni
- Institute for Complex Molecular Systems, Eindhoven University of Technology, P.O. Box 513, 5600 MB, Eindhoven, The Netherlands
| | - Amit Kumar Mondal
- Department of Chemical and Biological Physics, Weizmann Institute of Science, Rehovot, 76100, Israel
| | - Tapan Kumar Das
- Department of Chemical and Biological Physics, Weizmann Institute of Science, Rehovot, 76100, Israel
| | - Gal Grinbom
- Department of Chemical and Biological Physics, Weizmann Institute of Science, Rehovot, 76100, Israel
| | - Francesco Tassinari
- Department of Chemical and Biological Physics, Weizmann Institute of Science, Rehovot, 76100, Israel
| | - Mathijs F J Mabesoone
- Institute for Complex Molecular Systems, Eindhoven University of Technology, P.O. Box 513, 5600 MB, Eindhoven, The Netherlands
| | - E W Meijer
- Institute for Complex Molecular Systems, Eindhoven University of Technology, P.O. Box 513, 5600 MB, Eindhoven, The Netherlands
| | - Ron Naaman
- Department of Chemical and Biological Physics, Weizmann Institute of Science, Rehovot, 76100, Israel
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14
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Mishra S, Pirbadian S, Mondal AK, El-Naggar MY, Naaman R. Spin-Dependent Electron Transport through Bacterial Cell Surface Multiheme Electron Conduits. J Am Chem Soc 2019; 141:19198-19202. [DOI: 10.1021/jacs.9b09262] [Citation(s) in RCA: 38] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Suryakant Mishra
- Department of Chemical and Biological Physics, Weizmann Institute of Science, Rehovot 76100, Israel
| | - Sahand Pirbadian
- Department of Physics and Astronomy, University of Southern California, Los Angeles, California 90089, United States
| | - Amit Kumar Mondal
- Department of Chemical and Biological Physics, Weizmann Institute of Science, Rehovot 76100, Israel
| | - Mohamed Y. El-Naggar
- Department of Physics and Astronomy, University of Southern California, Los Angeles, California 90089, United States
- Department of Chemistry, University of Southern California, Los Angeles, California 90089, United States
- Department of Biological Sciences, University of Southern California, Los Angeles, California 91030, United States
| | - Ron Naaman
- Department of Chemical and Biological Physics, Weizmann Institute of Science, Rehovot 76100, Israel
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15
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Bullard G, Tassinari F, Ko CH, Mondal AK, Wang R, Mishra S, Naaman R, Therien MJ. Low-Resistance Molecular Wires Propagate Spin-Polarized Currents. J Am Chem Soc 2019; 141:14707-14711. [DOI: 10.1021/jacs.9b06142] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Affiliation(s)
- George Bullard
- Department of Chemistry, Duke University, Durham, North Carolina 27708, United States
| | - Francesco Tassinari
- Department of Chemical and Biological Physics, Weizmann Institute of Science, Rehovot 76100, Israel
| | - Chih-Hung Ko
- Department of Chemistry, Duke University, Durham, North Carolina 27708, United States
| | - Amit Kumar Mondal
- Department of Chemical and Biological Physics, Weizmann Institute of Science, Rehovot 76100, Israel
| | - Ruobing Wang
- Department of Chemistry, Duke University, Durham, North Carolina 27708, United States
| | - Suryakant Mishra
- Department of Chemical and Biological Physics, Weizmann Institute of Science, Rehovot 76100, Israel
| | - Ron Naaman
- Department of Chemical and Biological Physics, Weizmann Institute of Science, Rehovot 76100, Israel
| | - Michael J. Therien
- Department of Chemistry, Duke University, Durham, North Carolina 27708, United States
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Abstract
The first example of a pentacoordinate CoII single-ion magnet based on a P-donor ligand with vacant octahedral coordination geometry is reported here. Thorough magnetic measurements reveal the presence of field induced slow relaxation behavior with an easy-plane magnetic anisotropy. The combined theoretical and experimental studies disclose that direct and quantum tunneling processes become dominant at low temperature to relax the magnetization; however, from the thermal dependence of relaxation time it can be observed that the optical or acoustic Raman processes become important to the overall relaxation process.
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Affiliation(s)
- Amit Kumar Mondal
- Department of Chemistry, Indian Institute of Science Education and Research (IISER), Bhopal Bypass Road, Bhauri, Bhopal-462066, India.
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17
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Roy M, Adhikary A, Mondal AK, Mondal R. Multifunctional Properties of a 1D Helical Co(II) Coordination Polymer: Toward Single-Ion Magnetic Behavior and Efficient Dye Degradation. ACS Omega 2018; 3:15315-15324. [PMID: 31458193 PMCID: PMC6644332 DOI: 10.1021/acsomega.8b02212] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/29/2018] [Accepted: 10/31/2018] [Indexed: 05/16/2023]
Abstract
This contribution deals with the synthesis and utilization of a new pyrazole-based unsymmetrical ligand, 3-(3-carboxyphenyl)-1H-pyrazole-5-carboxylic acid (H2CPCA), for generating multifunctional materials. The reaction with the Co(II) salt in the presence of a co-ligand 2,9-dimethyl phenanthroline (dmphen) results in the formation of the helical compound {[Co2(dmphen)2(CPCA)2]DMF} n (1). However, two isostructural monomeric complexes are formed {[M(HCPCA)2(H2O)2], M = Co(II), (2) and Mn(II) (3)} when reactions were carried out in the absence of dmphen. Compound 1 shows some highly encouraging single-ion magnetic (SIM) properties. Detailed magnetic studies unveil slow relaxation of magnetization of compound 1, driven by the higher magnetic anisotropy of the cobalt ion, with the energy barrier of ∼9.2 K and relaxation time of 9.1 × 10-5 s, suggesting a SIM behavior. Moreover, UV-vis and fluorescence studies confirm the selective dye degradation of compound 1 with methylene blue both in the presence and absence of H2O2, with the remarkable degradation efficiency of ∼98 and ∼82%, respectively.
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Affiliation(s)
- Manasi Roy
- School
of Chemical Sciences, Indian Association
for the Cultivation of Science, 2A & 2B, Raja S.C. Mullick Road, Kolkata 700032, West Bengal, India
| | - Amit Adhikary
- School
of Chemical Sciences, Indian Association
for the Cultivation of Science, 2A & 2B, Raja S.C. Mullick Road, Kolkata 700032, West Bengal, India
- E-mail: (A.A.)
| | - Amit Kumar Mondal
- Department
of Chemical and Biological Physics, Weizmann
Institute of Science, 234 Herzl Street, P.O. Box 26, Rehovot 7610001, Israel
| | - Raju Mondal
- School
of Chemical Sciences, Indian Association
for the Cultivation of Science, 2A & 2B, Raja S.C. Mullick Road, Kolkata 700032, West Bengal, India
- E-mail: (R.M.)
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18
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Mondal S, Mondal AK, Sharma A, Devalla V, Rana S, Kumar S, Pandey JK. An Overview of Cleaning and Prevention Processes for Enhancing Efficiency of Solar Photovoltaic Panels. CURR SCI INDIA 2018. [DOI: 10.18520/cs/v115/i6/1065-1077] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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19
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Mondal AK, Mondal A, Dey B, Konar S. Influence of the Coordination Environment on Easy-Plane Magnetic Anisotropy of Pentagonal Bipyramidal Cobalt(II) Complexes. Inorg Chem 2018; 57:9999-10008. [DOI: 10.1021/acs.inorgchem.8b01162] [Citation(s) in RCA: 40] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Amit Kumar Mondal
- Department of Chemistry, Indian Institute of Science Education and Research Bhopal, Bhopal Bypass Road, Bhauri, Bhopal, 462066 Madhya Pradesh, India
| | - Arpan Mondal
- Department of Chemistry, Indian Institute of Science Education and Research Bhopal, Bhopal Bypass Road, Bhauri, Bhopal, 462066 Madhya Pradesh, India
| | - Bijoy Dey
- Department of Chemistry, Indian Institute of Science Education and Research Bhopal, Bhopal Bypass Road, Bhauri, Bhopal, 462066 Madhya Pradesh, India
| | - Sanjit Konar
- Department of Chemistry, Indian Institute of Science Education and Research Bhopal, Bhopal Bypass Road, Bhauri, Bhopal, 462066 Madhya Pradesh, India
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20
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Dey B, Roy S, Mondal AK, Santra A, Konar S. Zero Field SMM Behavior and Magnetic Refrigeration in Rare Heterometallic Double Stranded Helicates of Cu2
Ln2
(Ln = Dy, Tb, Gd). Eur J Inorg Chem 2018. [DOI: 10.1002/ejic.201800075] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Bijoy Dey
- Department of Chemistry; Indian Institute of Science Education and Research Bhopal; Bhopal by-pass road 462066 Bhauri, Bhopal MP India
| | - Subhadip Roy
- Department of Chemistry; Indian Institute of Science Education and Research Bhopal; Bhopal by-pass road 462066 Bhauri, Bhopal MP India
| | - Amit Kumar Mondal
- Department of Chemistry; Indian Institute of Science Education and Research Bhopal; Bhopal by-pass road 462066 Bhauri, Bhopal MP India
| | - Atanu Santra
- Department of Chemistry; Indian Institute of Science Education and Research Bhopal; Bhopal by-pass road 462066 Bhauri, Bhopal MP India
| | - Sanjit Konar
- Department of Chemistry; Indian Institute of Science Education and Research Bhopal; Bhopal by-pass road 462066 Bhauri, Bhopal MP India
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21
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Mondal AK, Sundararajan M, Konar S. A new series of tetrahedral Co(ii) complexes [CoLX2] (X = NCS, Cl, Br, I) manifesting single-ion magnet features. Dalton Trans 2018; 47:3745-3754. [DOI: 10.1039/c7dt04007e] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
The influence of ligand field strength on the magnetic anisotropy of a series of isostructural tetrahedral CoII complexes has been investigated by using a combined experimental and theoretical approach.
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Affiliation(s)
- Amit Kumar Mondal
- Department of Chemistry
- Indian Institute of Science Education and Research Bhopal
- Bhauri
- India
| | - Mahesh Sundararajan
- Theoretical Chemistry Section
- Bhabha Atomic Research Centre
- Mumbai 400085
- India
| | - Sanjit Konar
- Department of Chemistry
- Indian Institute of Science Education and Research Bhopal
- Bhauri
- India
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22
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Mondal AK, Jover J, Ruiz E, Konar S. Quantitative Estimation of Ising-Type Magnetic Anisotropy in a Family ofC3-Symmetric CoIIComplexes. Chemistry 2017; 23:12550-12558. [DOI: 10.1002/chem.201702108] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2017] [Indexed: 12/14/2022]
Affiliation(s)
- Amit Kumar Mondal
- Department of Chemistry; Indian Institute of Science Education and Research Bhopal; Bhopal Bypass Road, Bhauri Bhopal 462066, MP India
| | - Jesús Jover
- Departament de Química Inorgànica I Orgànica; Secció de Química Inorgànica and Institut de Recerca de Química Teòrica i Computacional; Universitat de Barcelona; Diagonal 645 08028 Barcelona Spain
| | - Eliseo Ruiz
- Departament de Química Inorgànica I Orgànica; Secció de Química Inorgànica and Institut de Recerca de Química Teòrica i Computacional; Universitat de Barcelona; Diagonal 645 08028 Barcelona Spain
| | - Sanjit Konar
- Department of Chemistry; Indian Institute of Science Education and Research Bhopal; Bhopal Bypass Road, Bhauri Bhopal 462066, MP India
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23
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Mondal AK, Goswami T, Misra A, Konar S. Probing the Effects of Ligand Field and Coordination Geometry on Magnetic Anisotropy of Pentacoordinate Cobalt(II) Single-Ion Magnets. Inorg Chem 2017; 56:6870-6878. [PMID: 28561569 DOI: 10.1021/acs.inorgchem.7b00233] [Citation(s) in RCA: 51] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
In this work, the effects of ligand field strength as well as the metal coordination geometry on magnetic anisotropy of pentacoordinated CoII complexes have been investigated using a combined experimental and theoretical approach. For that, a strategic design and synthesis of three pentacoordinate CoII complexes [Co(bbp)Cl2]·(MeOH) (1), [Co(bbp)Br2]·(MeOH) (2), and [Co(bbp)(NCS)2] (3) has been achieved by using the tridentate coordination environment of the ligand in conjunction with the accommodating terminal ligands (i.e., chloride, bromide, and thiocyanate). Detailed magnetic studies disclose the occurrence of slow magnetic relaxation behavior of CoII centers with an easy-plane magnetic anisotropy. A quantitative estimation of ZFS parameters has been successfully performed by density functional theory (DFT) calculations. Both the sign and magnitude of ZFS parameters are prophesied well by this DFT method. The theoretical results also reveal that the α → β (SOMO-SOMO) excitation contributes almost entirely to the total ZFS values for all complexes. It is worth noting that the excitation pertaining to the most positive contribution to the ZFS parameter is the dxy → dx2-y2 excitation for complexes 1 and 2, whereas for complex 3 it is the dz2 → dx2-y2 excitation.
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Affiliation(s)
- Amit Kumar Mondal
- Department of Chemistry, Indian Institute of Science Education and Research Bhopal , Bhopal Bypass Road, Bhauri, Bhopal 462066, Madhya Pradesh, India
| | - Tamal Goswami
- Department of Chemistry, University of North Bengal , Siliguri, Darjeeling 734013, West Bengal, India
| | - Anirban Misra
- Department of Chemistry, University of North Bengal , Siliguri, Darjeeling 734013, West Bengal, India
| | - Sanjit Konar
- Department of Chemistry, Indian Institute of Science Education and Research Bhopal , Bhopal Bypass Road, Bhauri, Bhopal 462066, Madhya Pradesh, India
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24
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Mondal AK, Jover J, Ruiz E, Konar S. Investigation of easy-plane magnetic anisotropy in P-ligand square-pyramidal CoII single ion magnets. Chem Commun (Camb) 2017; 53:5338-5341. [DOI: 10.1039/c7cc02584j] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.7] [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
Field induced slow magnetic relaxation behavior has been studied for the first time for two P-donor ligand-based square-pyramidal CoII complexes with an easy-plane magnetic anisotropy.
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Affiliation(s)
- Amit Kumar Mondal
- Department of Chemistry
- Indian Institute of Science Education and Research
- (IISER)
- Bhopal-462066
- India
| | - Jesús Jover
- Departament de Química Inorgànica i Orgànica and Institut de Recerca de Química Teòrica i Computacional
- Universitat de Barcelona
- E-08028 Barcelona
- Spain
| | - Eliseo Ruiz
- Departament de Química Inorgànica i Orgànica and Institut de Recerca de Química Teòrica i Computacional
- Universitat de Barcelona
- E-08028 Barcelona
- Spain
| | - Sanjit Konar
- Department of Chemistry
- Indian Institute of Science Education and Research
- (IISER)
- Bhopal-462066
- India
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25
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Devalla V, Mondal AK, Arun Jeya Prakash AJ, Prateek M, Prakash O. Guidance, Navigation and Control of a Powered Parafoil Aerial Vehicle. CURR SCI INDIA 2016. [DOI: 10.18520/cs/v111/i6/1045-1054] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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26
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Mondal AK, Khatua S, Tomar K, Konar S. Field‐Induced Single‐Ion‐Magnetic Behavior of Octahedral Co
II
in a Two‐Dimensional Coordination Polymer. Eur J Inorg Chem 2016. [DOI: 10.1002/ejic.201600847] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Amit Kumar Mondal
- Department of Chemistry Indian Institute of Science Education and Research Bhopal Bhopal by‐pass road 462066, MP Bhauri Bhopal India
| | - Sajal Khatua
- Department of Chemistry Indian Institute of Science Education and Research Bhopal Bhopal by‐pass road 462066, MP Bhauri Bhopal India
| | - Kapil Tomar
- Department of Chemistry Indian Institute of Science Education and Research Bhopal Bhopal by‐pass road 462066, MP Bhauri Bhopal India
| | - Sanjit Konar
- Department of Chemistry Indian Institute of Science Education and Research Bhopal Bhopal by‐pass road 462066, MP Bhauri Bhopal India
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Mondal AK, Khatua S, Tomar K, Konar S. Front Cover: Field‐Induced Single‐Ion‐Magnetic Behavior of Octahedral Co
II
in a Two‐Dimensional Coordination Polymer (Eur. J. Inorg. Chem. 22/2016). Eur J Inorg Chem 2016. [DOI: 10.1002/ejic.201670221] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Amit Kumar Mondal
- Department of Chemistry Indian Institute of Science Education and Research Bhopal Bhopal by‐pass road 462066, MP Bhauri Bhopal India
| | - Sajal Khatua
- Department of Chemistry Indian Institute of Science Education and Research Bhopal Bhopal by‐pass road 462066, MP Bhauri Bhopal India
| | - Kapil Tomar
- Department of Chemistry Indian Institute of Science Education and Research Bhopal Bhopal by‐pass road 462066, MP Bhauri Bhopal India
| | - Sanjit Konar
- Department of Chemistry Indian Institute of Science Education and Research Bhopal Bhopal by‐pass road 462066, MP Bhauri Bhopal India
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28
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Golla U, Adhikary A, Mondal AK, Tomar RS, Konar S. Synthesis, structure, magnetic and biological activity studies of bis-hydrazone derived Cu(ii) and Co(ii) coordination compounds. Dalton Trans 2016; 45:11849-63. [PMID: 27377047 DOI: 10.1039/c6dt01496h] [Citation(s) in RCA: 22] [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: 01/04/2023]
Abstract
Four coordination compounds of formulae [Cu(II)2(H2L(1))(HL(1))](ClO4)3·H2O (1), [Cu(II)2(H2L(2))(CH3OH)2](ClO4)2·2CH3OH (2), [Co(II)2(H2L(1))2](ClO4)4 (3) and [Co(II)2(H2L(2))2]·2H2O (4) were synthesized via self-assembly of succinohydrazone derived ligands (H2L(1) = N',N'-4-bis(2-pyridyl)succinohydrazide, H4L(2) = N',N'-4-bis(2-hydroxybenzylidene)succinohydrazide) and Cu(2+) and Co(2+) ions, respectively. The compounds were characterized by crystal structure determination, magnetic measurements and biological activities. Compounds 1, 3 and 4 have discrete double helicate structures, whereas compound 2 is a one-dimensional chain. Magnetic studies show antiferromagnetic exchange interactions in 2 with a J value of -67.1 cm(-1) and antiferromagnetic spin-canting in compound 3 originates through supramolecular H-bonding. For compound 3, a clear bifurcation was observed in zero field cooled (ZFC) and field cooled (FC) measurement at a temperature of 3.5 K and field of 0.1 T, implying long range magnetic ordering below this temperature. Interestingly, all of compounds 1-4 show significant changes in their absorption (hypo- and hyperchromism) in the presence of SS-DNA, inferring interaction between the compounds and DNA. In addition, compounds 1-4 significantly exhibited nuclease activities on both RNA and pUC19 plasmid DNA. Moreover, the nuclease activity was further enhanced in the presence of oxidant (H2O2) and suggests the possible role of reactive oxygen species in DNA nicking ability of compounds 1-4. Furthermore, compounds 1, 2 and 4 exhibited significant cytotoxicity against mammalian cancer cell lines (HeLa, A549 and MDAMB-231). In addition, our results from Annexin/PI staining and DNA fragmentation assays revealed that these compounds are capable of inducing apoptosis and have potential to act as anticancer drugs.
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29
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Mondal AK, Khatua S, Tomar K, Konar S. Field-Induced Single-Ion-Magnetic Behavior of Octahedral CoIIin a Two-Dimensional Coordination Polymer. Eur J Inorg Chem 2016. [DOI: 10.1002/ejic.201600569] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Amit Kumar Mondal
- Department of Chemistry; Indian Institute of Science Education and Research Bhopal; Bhopal by-pass road 462066, MP Bhauri Bhopal India
| | - Sajal Khatua
- Department of Chemistry; Indian Institute of Science Education and Research Bhopal; Bhopal by-pass road 462066, MP Bhauri Bhopal India
| | - Kapil Tomar
- Department of Chemistry; Indian Institute of Science Education and Research Bhopal; Bhopal by-pass road 462066, MP Bhauri Bhopal India
| | - Sanjit Konar
- Department of Chemistry; Indian Institute of Science Education and Research Bhopal; Bhopal by-pass road 462066, MP Bhauri Bhopal India
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30
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Mondal AK, Jena HS, Malviya A, Konar S. Lanthanide-Directed Fabrication of Four Tetranuclear Quadruple Stranded Helicates Showing Magnetic Refrigeration and Slow Magnetic Relaxation. Inorg Chem 2016; 55:5237-44. [DOI: 10.1021/acs.inorgchem.6b00177] [Citation(s) in RCA: 94] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Amit Kumar Mondal
- Department
of Chemistry, Indian Institute of Science Education and Research Bhopal, Bhopal-bypass road, Bahuri, Bhopal-462066, Madhya Pradesh, India
| | - Himanshu Sekhar Jena
- Department
of Chemistry, Indian Institute of Science Education and Research Bhopal, Bhopal-bypass road, Bahuri, Bhopal-462066, Madhya Pradesh, India
| | - Amita Malviya
- Department
of Chemistry, Indian Institute of Science Education and Research Bhopal, Bhopal-bypass road, Bahuri, Bhopal-462066, Madhya Pradesh, India
| | - Sanjit Konar
- Department
of Chemistry, Indian Institute of Science Education and Research Bhopal, Bhopal-bypass road, Bahuri, Bhopal-462066, Madhya Pradesh, India
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31
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Biswas S, Mondal AK, Konar S. Densely Packed Lanthanide Cubane Based 3D Metal–Organic Frameworks for Efficient Magnetic Refrigeration and Slow Magnetic Relaxation. Inorg Chem 2016; 55:2085-90. [DOI: 10.1021/acs.inorgchem.5b02486] [Citation(s) in RCA: 104] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Affiliation(s)
- Soumava Biswas
- Department of Chemistry, Indian Institute of Science Education and Research (IISER) Bhopal, Bhopal Bypass Road, Bhauri,
Bhopal 462 066, India
| | - Amit Kumar Mondal
- Department of Chemistry, Indian Institute of Science Education and Research (IISER) Bhopal, Bhopal Bypass Road, Bhauri,
Bhopal 462 066, India
| | - Sanjit Konar
- Department of Chemistry, Indian Institute of Science Education and Research (IISER) Bhopal, Bhopal Bypass Road, Bhauri,
Bhopal 462 066, India
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Mondal AK, Parmar VS, Biswas S, Konar S. Tetrahedral MII based binuclear double-stranded helicates: single-ion-magnet and fluorescence behaviour. Dalton Trans 2016; 45:4548-57. [DOI: 10.1039/c5dt04173b] [Citation(s) in RCA: 21] [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
It has been demonstrated that the slow relaxation of magnetization can be achieved in high spin tetrahedral CoII centres with an easy-plane magnetic anisotropy within the double-stranded helicates. The photoluminescence properties of the Zn analogues were studied in different solvents.
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Affiliation(s)
| | | | | | - Sanjit Konar
- Department of Chemistry
- IISER Bhopal
- Bhopal 462066
- India
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Malviya A, Jena HS, Mondal AK, Konar S. Europium‐Based Dinuclear Triple‐Stranded Helicate vs. Tetranuclear Quadruple‐Stranded Helicate: Effect of Stoichiometric Ratio on the Supramolecular Self‐Assembly. Eur J Inorg Chem 2015. [DOI: 10.1002/ejic.201500301] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Amita Malviya
- Department of Chemistry, Indian Institute of Science Education and Research Bhopal, Indore by‐pass road, Bhauri, Bhopal 462066, MP, India, http://skonarhomepage.wix.com/iiserb
| | - Himanshu Sekhar Jena
- Department of Chemistry, Indian Institute of Science Education and Research Bhopal, Indore by‐pass road, Bhauri, Bhopal 462066, MP, India, http://skonarhomepage.wix.com/iiserb
| | - Amit Kumar Mondal
- Department of Chemistry, Indian Institute of Science Education and Research Bhopal, Indore by‐pass road, Bhauri, Bhopal 462066, MP, India, http://skonarhomepage.wix.com/iiserb
| | - Sanjit Konar
- Department of Chemistry, Indian Institute of Science Education and Research Bhopal, Indore by‐pass road, Bhauri, Bhopal 462066, MP, India, http://skonarhomepage.wix.com/iiserb
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Abstract
This review highlights fundamental concepts and synthetic strategies of SMMs and selected examples of 3d, 4f, 5f and mixed 3d–4f, 4d–5d and 3d–5f based SMMs are discussed.
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Affiliation(s)
| | | | - Sanjit Konar
- Department of Chemistry
- IISER Bhopal
- Bhopal 462066
- India
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Mondal AK, Goswami S, Konar S. Influence of the coordination environment on slow magnetic relaxation and photoluminescence behavior in two mononuclear dysprosium(iii) based single molecule magnets. Dalton Trans 2015; 44:5086-94. [DOI: 10.1039/c4dt03620d] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.1] [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
Two luminescent mononuclear Dy(iii) based complexes with SMM behaviour have been reported. The SMM behaviours differ due to the slight variation of local symmetry around the Dy(iii) centers and photoluminescence study showed quantum yields of 0.98 and 1.44%.
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Affiliation(s)
| | | | - Sanjit Konar
- Department of Chemistry
- IISER Bhopal
- Bhopal 462066
- India
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Matapurkar BG, Bhargave A, Rehan HS, Mondal AK, Ramteke VK. Neo-regeneration of urinary bladder: a desired metaplasia of autologous membrane from rectosigmoid colon containing stem cells of intestinal crypts. Indian J Exp Biol 2010; 48:1083-1093. [PMID: 21117447] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
The current management of diseases of urinary bladder requiring resection is by augmentation cystoplasty or transplantation of ureters. Transplantation of ureters is associated with morbidity and mortality. Ideal management will be by regenerating urinary bladder in vivo. Neo-regeneration of tissues and organs like abdominal wall, aponeurosis etc., has been attempted and patented. After neo-regeneration of mesoderm tissues and organs, regeneration of urinary bladder (developed from endoderm) was. In vivo surgical techniques were developed in dogs. It is known that the embryonic morphogenesis of urinary bladder is from uro-genital sinus of hind gut. A membrane, containing endoderm stem cells in crypts of recto-sigmoid colon, was surgically isolated and colonized with remnant of urinary bladder wall after extensive resection. Experimental study was performed in dogs, for 60 days to one and a half year. Regeneration of all the layers of tissues of the wall of urinary bladder was observed. The neo-regeneration phenomenon has been recognized as "desired metaplasia". The regenerated neo tissue/organ on histological examination and cystometry studies was found compatible with normal urinary bladder. The hypothesis, neo-regeneration and desired metaplasia, is discussed.
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Affiliation(s)
- B G Matapurkar
- Department of Surgery, Lok Nayak Hospital and Maulana Azad Medical College, New Delhi 110 001, India.
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De P, Kumar DP, Mondal AK, Mandal PC, Mukhopadhyay S, Banerjee R. In alkaline media, Fremy’s salt oxidizes alkanols by a hydrogen atom transfer mechanism. Polyhedron 2010. [DOI: 10.1016/j.poly.2010.01.018] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Woodi M, Mondal AK, Padmanabhan B, Rajagopalan KP. Analysis of protein posttranslational modifications by mass spectrometry: With special reference to haemoglobin. Indian J Clin Biochem 2009; 24:23-9. [PMID: 23105802 DOI: 10.1007/s12291-009-0004-3] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Mass spectrometry provides a convenient platform for the study of different protein post translational modifications from clinical specimen. Analysis of different post translational modifications of hemoglobin like glycation and glutathionylation can provide useful information on the disease progression and the possible outcome of therapies. In the present study, we have addressed post translational modifications of hemoglobin like glutathionylation and glycation in relation to diabetes and chronic renal failure. We found that both alpha and beta chains of human hemoglobin are glycated irrespective of the extent of glycemia as evidenced by a mass increment of 162 Da. The phenomenon of glutathionylation was observed with only the beta globin chain of hemoglobin probably due to the presence of an accessible cysteine residue indicated by a mass increment of 305 Da. Also, the extent of gltuathionylation observed in the CRF patients could correlate with the severity of the oxidative stress owing to renal replacement therapies like dialysis and transplantation.
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Affiliation(s)
- Murali Woodi
- Cauvery Medical Center, Bangalore, Karnataka India ; Cauvery Medical Center, # 43/2, Bellary road, N.H.7, Sahakara nagar, Banglore, 560 092 India
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Saha P, Mondal AK, Mayilraj S, Krishnamurthi S, Bhattacharya A, Chakrabarti T. Paenibacillus assamensis sp. nov., a novel bacterium isolated from a warm spring in Assam, India. Int J Syst Evol Microbiol 2005; 55:2577-2581. [PMID: 16280530 DOI: 10.1099/ijs.0.63846-0] [Citation(s) in RCA: 71] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
A polyphasic approach was used to characterize a bacterium, GPTSA 11(T), isolated from a warm spring located in a reserve forest in Assam, India. The cells are Gram-variable, strictly aerobic, sporulating motile rods. The major fatty acids of the strain are C(15 : 0) anteiso (48.42 %), C(16 : 0) iso (11.59 %), C(16 : 1)omega11c (6.16 %), C(15 : 0) iso (6.03 %), C(17 : 0) anteiso (5.68 %) and C(16 : 1)omega7c alcohol (5.01 %). The presence of the fatty acid C(16 : 1)omega7c alcohol distinguishes this strain from other closely related species of the genus Paenibacillus. The strain contains MK-7 as the diagnostic menaquinone. The G+C content of the genomic DNA is 41.2 mol%. Analysis of the 16S rRNA gene sequence (1466 nt) revealed the presence of signature sequences PAEN 515F (5'-GAGTAACTGCTCTCGGAATGACGGTACTTGAGAAGAAAGCCCC-3') and PAEN 862F (5'-TCGATACCCTTGGTGCCGAAGT-3'), which were found in the species of the genus Paenibacillus surveyed by Shida et al. [Shida, O., Takagi, H., Kadowaki, K., Nakamura, L. K. & Komagata, K. (1997). Int J Syst Bacteriol 47, 289-298]. The sequence shows closest similarity (95.85 %) to that of Paenibacillus apiarius, followed by Paenibacillus alvei (94.34 %), Paenibacillus cineris (93.87 %), Paenibacillus favisporus (93.80 %), Paenibacillus chibensis (93.47 %) and Paenibacillus azoreducens (93.40 %). Biochemical, physiological, chemotaxonomic and phylogenetic analyses justify placement of the strain in the genus Paenibacillus but not within any existing species. It should, therefore, be considered as representing a novel species, for which the name Paenibacillus assamensis sp. nov. is proposed. The type strain is GPTSA 11T (=MTCC 6934T=JCM 13186T).
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Affiliation(s)
- P Saha
- Institute of Microbial Technology, Sector 39A, Chandigarh 160 036, India
- Microbial Type Culture Collection and Gene Bank (MTCC), Sector 39A, Chandigarh 160 036, India
| | - A K Mondal
- Institute of Microbial Technology, Sector 39A, Chandigarh 160 036, India
| | - S Mayilraj
- Institute of Microbial Technology, Sector 39A, Chandigarh 160 036, India
- Microbial Type Culture Collection and Gene Bank (MTCC), Sector 39A, Chandigarh 160 036, India
| | - S Krishnamurthi
- Institute of Microbial Technology, Sector 39A, Chandigarh 160 036, India
- Microbial Type Culture Collection and Gene Bank (MTCC), Sector 39A, Chandigarh 160 036, India
| | - A Bhattacharya
- Institute of Microbial Technology, Sector 39A, Chandigarh 160 036, India
- Microbial Type Culture Collection and Gene Bank (MTCC), Sector 39A, Chandigarh 160 036, India
| | - T Chakrabarti
- Institute of Microbial Technology, Sector 39A, Chandigarh 160 036, India
- Microbial Type Culture Collection and Gene Bank (MTCC), Sector 39A, Chandigarh 160 036, India
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Sengupta J, Mondal AK, Jain P, Garg RD, Mathur NC, Moharana AK. Comparative evaluation of cefpodoxime versus cefixime in children with lower respiratory tract infections. Indian J Pediatr 2004; 71:517-21. [PMID: 15226561 DOI: 10.1007/bf02724293] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
OBJECTIVE The emergence of penicillin and macrolide resistant strains, responsible for Acute Lower Respiratory Tract Infections in children has offered third generation cephalosporins the platform to perform. The aim of the present study was to evaluate two third generation oral cephalosporins for their empirical use in community acquired lower respiratory tract infections in pediatric patients. An assessment of the clinical cure and bacteriological eradication rates and an overall tolerability was made. METHODS It was a prospective, open, comparative, multicentric study. 776 children (Mean age 10 years) with LRTIs were included and randomly allotted to two groups respectively. A total of 396 children were given cefpodoxime susp 5 mg/kg b.i.d. and 380 patients on cefixime 4 mg/kg b.i.d. for 10-14 days. RESULTS At the end of therapy, the clinical success with cefpodoxime was 97% as against 86.8% with cefixime. Bacterial eradication was 93.4% with cefpodoxime and 82.9% with cefixime. CONCLUSION Cefpodoxime has been found to be a well-tolerated and superior alternative to cefixime synergistically documenting the extended spectrum of activity.
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Bansal PK, Sharma P, Mondal AK. A minisatellite sequence in the upstream region of the DURA3 gene from the halotolerant yeast Debaryomyces hansenii. Yeast 2001; 18:1301-7. [PMID: 11571754 DOI: 10.1002/yea.774] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
Abstract
The URA3 gene of Debaryomyces hansenii, encoding orotidine 5'-phosphate decarboxylase enzyme, was isolated by complementation in the yeast Saccharomyces cerevisiae. The deduced amino acid sequence is highly similar to Ura3 proteins from other yeast and fungal species. Analysis of the region upstream of the coding sequence revealed the presence of AG-rich minisatellite DNA sequences. In addition, upstream of the DURA3 sequence, we have found the 3'-terminal of a gene encoding a GEA2-like protein.
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Affiliation(s)
- P K Bansal
- Institute of Microbial Technology, Sector 39A, Chandigarh 160 036, India
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Bansal PK, Sharma P, Mondal AK. A PBS2 homologue from Debaryomyces hansenii shows a differential effect on calcofluor and polymyxin B sensitivity in Saccharomyces cerevisiae. Yeast 2001; 18:1207-16. [PMID: 11561288 DOI: 10.1002/yea.769] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
Abstract
The PBS2 gene encodes a MAP kinase kinase that plays a pivotal role in osmosensing signal-transduction pathway in the yeast Saccharomyces cerevisiae. Mutation in the PBS2 gene has a pleotropic effect. Besides being osmosensitive, pbs2 mutants show altered sensitivity to polymyxin B and calcofluor. Recent studies revealed that Pbs2p plays a different role in osmoadaptation and calcofluor sensitivity. We have isolated a gene homologous to PBS2 from the highly salt-tolerant yeast Debaryomyces hansenii by phenotypic complementation. DNA sequencing of the clone revealed that the gene encoded a protein of 683 amino acid residues. Like Pbs2p, this protein also has a proline-rich motif. Further characterization revealed that this gene could complement polymyxin B sensitivity but did not affect calcofluor sensitivity. Thus, it appeared that Pbs2p also has an independent role in these two physiological processes. The GenBank Accession No. of this sequence is AF371315.
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Affiliation(s)
- P K Bansal
- Institute of Microbial Technology, Sector 39A, Chandigarh 160 036, India
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Abstract
In this study we assessed the role of DNA flow cytometry (FCM) as an adjunct to bladder irrigation cytology to detect carcinoma of the bladder. We selected only those cases who had urinary symptoms and cystoscopic examination or histology-proven cases of bladder cancer who underwent cystoscopy for a follow-up study. Cystoscopy, cytologic examination, and DNA FCM were performed in every case. There were 9 fresh cases and 21 follow-up cases of proven transitional-cell carcinoma (TCC) of the bladder. Cystoscopy revealed growth in all 9 fresh cases as well as in 11 follow-up cases. Cytology was positive in 16 cases, out of which there were 8 each of fresh and recurrent cases. None of the cases showed positive cytology with negative cystoscopy findings. DNA FCM was positive in 13 cases. Aneuploidy was detected in 5 cases, out of which there were 3 hyperdiploid and 2 hypodiploid cases. Nine cases had high (equal or more than 10%) S and G2-M phase cells, ranging from 10-19.36%. One case showed aneuploidy along with high S-G2M phase. Both cytology and DNA FCM were positive in 9 cases. In 2 cases, DNA FCM showed aneuploidy, but cytology and cystoscopy were negative. The sensitivity and specificity of the bladder wash cytology were 80% and 100%, and those for DNA FCM were 55% and 83.3%, respectively. We conclude that both bladder wash cytology and DNA FCM techniques should be done in all the cases of suspected TCC to detect more number of positive cases.
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Affiliation(s)
- N U Kumar
- Department of Surgery, Post Graduate Institute of Medical Education and Research (PGIMER), Chandigarh, India
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Abstract
DNA flow cytometry (FCM) was performed from fine-needle aspiration cytology (FNAC) of testis in 15 cases of male infertility to quantitate spermatogenesis. The results were correlated with FNAC findings. DNA FCM showed a ploidy relationship of haploid (1N) > diploid (2N) > tetraploid (4N) in cases of normal spermatogenesis. A ploidy relation of 2N > 1N > 4N was observed in cases of hypospermatogenesis or maturation arrest. In Sertoli cell-only cases, there were only 2N populations of cells. With the help of DNA FCM, a rapid and objective assessment of spermatogenesis is possible from FNAC of the testis.
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Affiliation(s)
- P Dey
- Department of Cytology, Post Graduate Institute of Medical Education and Research, Chandigarh, India.
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Abstract
The HOG1 gene encodes a MAP kinase that plays an essential role in maintaining water homeostasis in the yeast Saccharomyces cerevisiae. A gene homologous to S. cerevisiae HOG1 has been isolated from a highly salt-tolerant yeast, Debaryomyces hansenii, by phenotypic complementation. DNA sequencing of the clone revealed the presence of an open reading frame encoding a protein 387 amino acids long. The deduced amino acid sequence showed very high similarity with homologous genes identified from S. cerevisiae, Candida albicans and Zygosaccharomyces rouxii. In addition, it has also TGY motif characteristics of hyperosmolarity-activated MAP kinases. The Genbank Accession No. of this sequence is AF185278.
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Affiliation(s)
- P K Bansal
- Institute of Microbial Technology, Sector 39A, Chandigarh 160 036, India
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Chatterjee S, Mondal AK, Begum NA, Roychoudhury S, Das J. Ordered cloned DNA map of the genome of Vibrio cholerae 569B and localization of genetic markers. J Bacteriol 1998; 180:901-8. [PMID: 9473045 PMCID: PMC106970 DOI: 10.1128/jb.180.4.901-908.1998] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/1997] [Accepted: 12/06/1997] [Indexed: 02/06/2023] Open
Abstract
By using a low-resolution macrorestriction map as the foundation (R. Majumder et al., J. Bacteriol. 176:1105-1112, 1996), an ordered cloned DNA map of the 3.2-Mb chromosome of the hypertoxinogenic strain 569B of Vibrio cholerae has been constructed. A cosmid library the size of about 4,000 clones containing more than 120 Mb of V. cholerae genomic DNA (40-genome equivalent) was generated. By combining landmark analysis and chromosome walking, the cosmid clones were assembled into 13 contigs covering about 90% of the V. cholerae genome. A total of 92 cosmid clones were assigned to the genome and to regions defined by NotI, SfiI, and CeuI macrorestriction maps. Twenty-seven cloned genes, 9 rrn operons, and 10 copies of a repetitive DNA sequence (IS1004) have been positioned on the ordered cloned DNA map.
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Affiliation(s)
- S Chatterjee
- Biophysics Division, Indian Institute of Chemical Biology, Calcutta
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Mondal AK, Parui S, Mandal S. Protein profile of the allergenic pollen of Ipomoea fistulosa L.--a comparative study. Ann Agric Environ Med 1998; 5:131-134. [PMID: 9860814] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
The pollen of Ipomoea fistulosa L. is an important aeroallergen of India. The pollen of this plant was collected from full bloomed flowers growing in different places of West Bengal, India. Protein content and profile were studied by SDS-PAGE. Skin-prick tests with pollen antigens of all the samples were also performed. Considerable variation in the protein content and profile was noted with the highest protein content in the collected sample of Calcutta showing highest number of protein bands (10) designated as IF1 to IF10 with their weights ranging between 31 kDa to 89 kDa and 3 bands (IF8, IF9 and IF10) having molecular weights less than 29 kDa. Skin-prick tests also revealed highest degree of sensitivity to the Calcutta sample giving positive response in 52% of the patients. Skin reactivity ranged between 1+ to 3+.
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Affiliation(s)
- A K Mondal
- Department of Botany, Visva-Barati, Santiniketan - 731235, West Bengal, India.
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Mondal AK, Parui S, Mandal S. Analysis of the free amino acid content in pollen of nine Asteraceae species of known allergenic activity. Ann Agric Environ Med 1998; 5:17-20. [PMID: 9852488] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
The study reports the free amino acid composition of the pollen of nine members of the family Asteraceae, i.e. Ageratum conyzoides L., Blumea oxyodonta DC., Eupatorium odoratum L., Gnaphalium indicum L., Mikania scandens Willd., Parthenium hysterophorus L., Spilanthes acmella Murr., Vernonia cinerea (L.) Lees. and Xanthium strumarium L. by thin layer chromatography. The amino acid content was found to vary from 0.5-4.0% of the total dry weight. Fourteen amino acids were identified, among which amino-n-butyric acid, aspartic acid and proline were present in almost all pollen samples. The other major amino acids present in free form included arginine, cystine, glutamic acid, glycine, isoleucine, leucine, methionine, ornithine, tryptophan and tyrosine.
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Affiliation(s)
- A K Mondal
- Department of Botany, Visva-Bharati University, Santiniketan - 731235, West Bengal, India.
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Dasgupta A, Ghosh RN, Mondal AK. Malignant Brenner tumour of ovary. J Indian Med Assoc 1997; 95:25-6. [PMID: 9212569] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Affiliation(s)
- A Dasgupta
- Department of Pathology, Burdwan Medical College
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