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Ghosh R, Singh B, Basu S, Mondal A, Maiti PK, De M. Reversing the Trend: Deciphering Self-Assembly of Unconventional Amphiphiles having both Alkyl-chain and PEG. Chempluschem 2024:e202400147. [PMID: 38623044 DOI: 10.1002/cplu.202400147] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2024] [Revised: 04/15/2024] [Accepted: 04/15/2024] [Indexed: 04/17/2024]
Abstract
In the field of molecular self-assembly, the core of an assembly is always made up of hydrophobic moiety like a long alkyl chain, whereas the outer part has always been a hydrophilic moiety such as poly(ethylene glycol) (PEG), or charged species. Hence, reversing the trend to manifest self-assembled structures with a PEG core and a surface consisting of alkyl chains in aqueous system is incredibly challenging. Herein, we architected a unique class of cationic bolaamphiphiles containing low molecular weight PEG and alkyl chains of different lengths. The bolaamphiphiles spontaneously form vesicles without external stimuli. These vesicles are unprecedented because PEG makes up the vesicle core, while the alkyl chains appear on the vesicles' exterior. Hence, this is the first report on an assembly that reverses the usual trend. The vesicle size increases with the increase in alkyl chain-length. To our great surprise, we obtained large micelles for longest alkyl-chain amphiphile, which in turn act as a gemini amphiphile. The shift from a particular bolaamphiphile to gemini amphiphile with the variation of alkyl chain is also unexplored. Therefore, this specific class of self-assembled structure would compound a new paradigm in the fields of molecular self-assembly and supramolecular chemistry.
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Affiliation(s)
- Rita Ghosh
- Indian Institute of Science, Department of Organic Chemistry, INDIA
| | - Bharat Singh
- Indian Institute of Science, Department of Physics, INDIA
| | - Subhadip Basu
- Indian Institute of Science, Department of Physics, INDIA
| | - Avijit Mondal
- Indian Institute of Science, Department of Organic Chemistry, INDIA
| | | | - Mrinmoy De
- Indian Institute of Science, Organic Chemistry, Bangalore, 560094, Bangalore, INDIA
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2
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Samanta A, Behera P, Chaubey A, Mondal A, Pal D, Mohar K, Roy L, Srimani D. Experimental and theoretical insights for designing Zn 2+ complexes to trigger chemo-selective hetero-coupling of alcohols. Chem Commun (Camb) 2024; 60:4056-4059. [PMID: 38505958 DOI: 10.1039/d4cc00864b] [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: 03/21/2024]
Abstract
Designing well-defined Zn-complexes for sustainable dehydrogenative catalysis overcoming the difficulties associated with activating Zn2+(d10)-metal species is considered paramount goal in catalysis. Herein, we explore the plausibility of β-alkylation of secondary alcohols with primary alcohols by well-defined 3d10 Zn-complexes. Detailed organometallic and catalytic investigations, in conjunction with computational analyses, were conducted to ascertain the potential involvement of the catalyst at various stages of the catalytic process.
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Affiliation(s)
- Arup Samanta
- Department of Chemistry, Indian Institute of Technology-Guwahati, Kamrup, Assam 781039, India.
| | - Prativa Behera
- Institute of Chemical Technology Mumbai, IOC Odisha Campus Bhubaneswar, Bhubaneswar, Odisha 751013, India.
| | - Amit Chaubey
- Department of Chemistry, Indian Institute of Technology-Guwahati, Kamrup, Assam 781039, India.
| | - Avijit Mondal
- Department of Chemistry, Indian Institute of Technology-Guwahati, Kamrup, Assam 781039, India.
| | - Debjyoti Pal
- Department of Chemistry, Indian Institute of Technology-Guwahati, Kamrup, Assam 781039, India.
| | - Kailash Mohar
- Department of Chemistry, Indian Institute of Technology-Guwahati, Kamrup, Assam 781039, India.
| | - Lisa Roy
- Institute of Chemical Technology Mumbai, IOC Odisha Campus Bhubaneswar, Bhubaneswar, Odisha 751013, India.
| | - Dipankar Srimani
- Department of Chemistry, Indian Institute of Technology-Guwahati, Kamrup, Assam 781039, India.
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3
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Mondal A, Pal D, Phukan HJ, Roy M, Kumar S, Purkayastha S, Guha AK, Srimani D. Manganese Complex Catalyzed Sequential Multi-component Reaction: Enroute to a Quinoline-Derived Azafluorenes. ChemSusChem 2024; 17:e202301138. [PMID: 38096176 DOI: 10.1002/cssc.202301138] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/02/2023] [Revised: 11/06/2023] [Indexed: 01/09/2024]
Abstract
The development of innovative synthetic strategies for constructing complex molecular structures is the heart of organic chemistry. This significance of novel reactions or reaction sequences would further enhance if they permitted the synthesis of new classes of structural motifs, which have not been previously created. The research on the synthesis of heterocyclic compounds is one of the most active topics in organic chemistry due to the widespread application of N-heterocycles in life and material science. The development of a new catalytic process that employs first-row transition metals to produce a range of heterocycles from renewable raw materials is considered highly sustainable approach. This would be more advantageous if done in an eco-friendly and atom-efficient manner. Herein we introduce, the synthesis of various new quinoline based azafluorenes via sequential dehydrogenative multicomponent reaction (MCR) followed by C(sp3)-H hydroxylation and annulation. Our newly developed, Mn-complexes have the ability to direct the reaction in order to achieve a high amount of desired functionalized heterocycles while minimizing the possibility of multiple side reactions. We also performed a series of control experiments, hydride trapping experiments, reaction kinetics, catalytic intermediate and DFT studies to comprehend the detailed reaction route and the catalyst's function in the MCR sequence.
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Affiliation(s)
- Avijit Mondal
- Department of Chemistry, Indian Institute of Technology-Guwahati, Kamrup, Assam, 781039, India
| | - Debjyoti Pal
- Department of Chemistry, Indian Institute of Technology-Guwahati, Kamrup, Assam, 781039, India
| | - Hirak Jyoti Phukan
- Department of Chemistry, Indian Institute of Technology-Guwahati, Kamrup, Assam, 781039, India
| | - Mithu Roy
- Department of Chemistry, Indian Institute of Technology-Guwahati, Kamrup, Assam, 781039, India
| | - Saurabh Kumar
- Department of Chemistry, Indian Institute of Technology-Guwahati, Kamrup, Assam, 781039, India
| | | | - Ankur Kanti Guha
- Advanced Computational Chemistry Centre, Cotton University, Guwahati, 781001, India
| | - Dipankar Srimani
- Department of Chemistry, Indian Institute of Technology-Guwahati, Kamrup, Assam, 781039, India
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4
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Mondal A, Phukan HJ, Pal D, Kumar S, Roy M, Srimani D. Well-Defined Mn(II)-complex Catalyzed Switchable De(hydrogenative) Csp 3 -H Functionalization of Methyl Heteroarenes: A Sustainable Approach for Diversification of Heterocyclic Motifs. Chemistry 2024; 30:e202303315. [PMID: 37933814 DOI: 10.1002/chem.202303315] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2023] [Revised: 11/06/2023] [Accepted: 11/07/2023] [Indexed: 11/08/2023]
Abstract
Catalytic activities of Mn(I) complexes derived from expensive MnBr(CO)5 salt have been explored in various dehydrogenative transformations. However, the reactivity and selectivity of inexpensive high spin Mn(II) complexes are uncommon. Herein, we have synthesized four new Mn(II) complexes and explored switchable alkenylation and alkylation of methyl heteroarenes employing a single Mn(II)catalyst. The developed protocol selectively furnishes a series of functionalized E-heteroarenes and C-alkylated heteroarenes with good to excellent yields. Various medicinally and synthetically useful compounds are successfully synthesized using our developed protocol. Various controls and kinetics experiments were executed to shed light on the mechaism,which reveals that α-C-H bond breaking of alcohol is the slowest step.
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Affiliation(s)
- Avijit Mondal
- Department of Chemistry, Indian Institute of Technology-Guwahati, Kamrup, Assam, 781039, India
| | - Hirak Jyoti Phukan
- Department of Chemistry, Indian Institute of Technology-Guwahati, Kamrup, Assam, 781039, India
| | - Debjyoti Pal
- Department of Chemistry, Indian Institute of Technology-Guwahati, Kamrup, Assam, 781039, India
| | - Saurabh Kumar
- Department of Chemistry, Indian Institute of Technology-Guwahati, Kamrup, Assam, 781039, India
| | - Mithu Roy
- Department of Chemistry, Indian Institute of Technology-Guwahati, Kamrup, Assam, 781039, India
| | - Dipankar Srimani
- Department of Chemistry, Indian Institute of Technology-Guwahati, Kamrup, Assam, 781039, India
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5
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Mondal A, Salampuriya R, Umesh A, De M. Thiol ligand-mediated exfoliation of bulk sulfur to nanosheets and nanodots: applications in antibacterial activity. J Mater Chem B 2024; 12:973-983. [PMID: 38175035 DOI: 10.1039/d3tb02403b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2024]
Abstract
Reducing bulk materials to layers or dots results in profound alterations in their physiochemical and optoelectronic properties, leading to a wide array of applications, spanning from device manufacturing to biomedicine. In this regard, the preparation of sulfur nanomaterials has garnered significant attention due to their low toxicity. Traditional methods for sulfur nanomaterial synthesis often involve harsh reaction conditions, leaving a gap for convenient approaches to create nanomaterials, such as nanosheets (NSs) and nanodots (NDs). Herein, the mechanical exfoliation of bulk sulfur using a surfactant thiol ligand with probe sonication is reported, making a unique contribution to existing methods. In the reported method, the thiol group binds to sulfur surfaces, facilitating exfoliation and stabilization, while the hydrophilic ends provide functional groups for exfoliated nanomaterials. Exfoliation can yield either nanosheets or nanodots, depending on the thiol ligand and exfoliation time. This approach offers the opportunity to exfoliate bulk sulfur using bioactive thiol ligands. With this goal in mind, bulk sulfur was exfoliated with 4-mercaptophenylboronic acid (BA) to target Gram-positive bacteria. This innovative exfoliation strategy of bulk sulfur using thiol ligands holds immense promise for synthesizing functionalized sulfur nanomaterials with wide-ranging applications, particularly in biomedicine.
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Affiliation(s)
- Avijit Mondal
- Department of Organic Chemistry, Indian Institute of Science, Bangalore 560012, India.
| | - Rashi Salampuriya
- Department of Organic Chemistry, Indian Institute of Science, Bangalore 560012, India.
| | - Aditya Umesh
- Department of Organic Chemistry, Indian Institute of Science, Bangalore 560012, India.
| | - Mrinmoy De
- Department of Organic Chemistry, Indian Institute of Science, Bangalore 560012, India.
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6
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Pal D, Mondal A, Sarmah R, Srimani D. Designing Cobalt(II) Complexes for Tandem Dehydrogenative Synthesis of Quinoline and Quinazoline Derivatives. Org Lett 2024. [PMID: 38194364 DOI: 10.1021/acs.orglett.3c03944] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2024]
Abstract
In this work, we have constructed three new Co(II) complexes in which steric features govern their structural geometry. The metal ligand-cooperation behavior of the alkoxy arm is utilized to explore the catalytic activities of these complexes with respect to dehydrogenation. A wide range of C-3-substituted quinoline and quinazoline derivatives were synthesized in high yields. The developed protocol's usefulness is enhanced by the chemoselective transformation of different fatty alcohols to synthesize heterocycles having distal unsaturation. Various kinetic, mechanistic, and control studies were conducted to comprehend the reaction route.
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Affiliation(s)
- Debjyoti Pal
- Department of Chemistry, Indian Institute of Technology-Guwahati, Kamrup, Assam 781039, India
| | - Avijit Mondal
- Department of Chemistry, Indian Institute of Technology-Guwahati, Kamrup, Assam 781039, India
| | - Rajashri Sarmah
- Department of Chemistry, Indian Institute of Technology-Guwahati, Kamrup, Assam 781039, India
| | - Dipankar Srimani
- Department of Chemistry, Indian Institute of Technology-Guwahati, Kamrup, Assam 781039, India
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7
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Bali S, Goswami S, Halder A, Mondal A. A facile approach for selective detection of arsenite ions using plasmonic behaviour of silver nanoparticles. Anal Methods 2024; 16:170-174. [PMID: 38099858 DOI: 10.1039/d3ay01701j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/05/2024]
Abstract
A specific reagent/aptamer-free easy redox strategy between silver(I) moieties present in a citrate-stabilized colloidal silver nanoparticle (NP) system and arsenite ions is described that enables plasmonic change of AgNPs for the selective quantification of arsenite ions in the range of 0 to 30 μM with a low limit of quantification value of 50 nM (5.3 ppb).
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Affiliation(s)
- Somnath Bali
- Department of Chemistry, Presidency University, 86/1 College Street, Kolkata 700073, India.
| | - Subhajit Goswami
- Department of Chemistry, Presidency University, 86/1 College Street, Kolkata 700073, India.
| | - Arnab Halder
- Department of Chemistry, Presidency University, 86/1 College Street, Kolkata 700073, India.
| | - Avijit Mondal
- Department of Chemistry, Presidency University, 86/1 College Street, Kolkata 700073, India.
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8
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Mondal A, Pandit S, Sahoo J, Subramaniam Y, De M. Post-functionalization of sulfur quantum dots and their aggregation-dependent antibacterial activity. Nanoscale 2023; 15:18624-18638. [PMID: 37975185 DOI: 10.1039/d3nr04287a] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2023]
Abstract
Sulfur quantum dots (SQDs) have emerged as an intriguing class of luminescent nanomaterial due to their exceptional physiochemical and optoelectronic properties. However, their biomedical application is still in its infancy due to the limited scope of their surface functionalization. Herein, we explored the surface functionalization of SQDs through different thiol ligands with tuneable functionality and tested their antibacterial efficacy. Notably, very high antibacterial activity of functionalized SQDs (10-25 ng ml-1) was noted, which is 105 times higher compared to that of nonfunctionalized SQDs. Moreover, a rare phenomenon of the reverse trend of antibacterial activity through surface modification was observed, with increasing surface hydrophobicity of various nanomaterials as the antibacterial activity increased. However, we also noted that as the surface hydrophobicity increased, the SQDs tended to exhibit a propensity for aggregation, which consequently decreased their antibacterial efficacy. This identical pattern was also evident in in vivo assessments. Overall, this study illuminates the importance of surface modifications of SQDs and the role of surface hydrophobicity in the development of antibacterial agents.
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Affiliation(s)
- Avijit Mondal
- Department of Organic Chemistry, Indian Institute of Science, Bangalore 560012, India.
| | - Subrata Pandit
- Department of Organic Chemistry, Indian Institute of Science, Bangalore 560012, India.
| | - Jagabandhu Sahoo
- Department of Organic Chemistry, Indian Institute of Science, Bangalore 560012, India.
| | | | - Mrinmoy De
- Department of Organic Chemistry, Indian Institute of Science, Bangalore 560012, India.
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9
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Solanki P, Bose B, Mondal A, Kottayasamy Seenivasagam R. Solid pseudopapillary neoplasm of the pancreas mimicking gastrointestinal stromal tumour. BMJ Case Rep 2023; 16:e254805. [PMID: 37723092 PMCID: PMC10510940 DOI: 10.1136/bcr-2023-254805] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/20/2023] Open
Abstract
Solid pseudopapillary neoplasm (SPN) of pancreas is an uncommon low-grade malignant tumour that has a remarkable postoperative cure rate. Improved awareness and widespread use of imaging have resulted in more frequent diagnosis of these tumours. We report a case of a woman in her 20s who had an abdominal lump identified as a gastrointestinal stromal tumour on imaging elsewhere. The patient was reevaluated in our hospital and given a provisional diagnosis of SPN on radiology, which was later confirmed on postoperative histopathology.
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Sharma R, Mondal A, Samanta A, Srimani D. A Strategic Approach For Csp3-H Functionalization of 9H-Fluorene: A Acceptorless Dehydrogenation and Borrowing Hydrogen Approach. Catal Sci Technol 2023. [DOI: 10.1039/d2cy02060b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Herein we described the selective synthesis of both alkylated and alkenylated fluorenes using a single SNS ligand derived nickel complex. The protocol was employed for a wide range of substrates,...
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Sharma R, Mondal A, Samanta A, Biswas N, Das B, Srimani D. Well‐Defined Ni−SNS Complex Catalysed Borrowing Hydrogenative α‐Alkylation of Ketones and Dehydrogenative Synthesis of Quinolines. Adv Synth Catal 2022. [DOI: 10.1002/adsc.202200209] [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: 11/09/2022]
Affiliation(s)
- Rahul Sharma
- Department of Chemistry Indian Institute of Technology-Guwahati Kamrup Assam 781039 India
| | - Avijit Mondal
- Department of Chemistry Indian Institute of Technology-Guwahati Kamrup Assam 781039 India
| | - Arup Samanta
- Department of Chemistry Indian Institute of Technology-Guwahati Kamrup Assam 781039 India
| | - Nandita Biswas
- Department of Chemistry Indian Institute of Technology-Guwahati Kamrup Assam 781039 India
| | - Babulal Das
- Department of Chemistry Indian Institute of Technology-Guwahati Kamrup Assam 781039 India
| | - Dipankar Srimani
- Department of Chemistry Indian Institute of Technology-Guwahati Kamrup Assam 781039 India
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Mondal A, Sharma R, Dutta B, Pal D, Srimani D. Well-Defined NNS-Mn Complex Catalyzed Selective Synthesis of C-3 Alkylated Indoles and Bisindolylmethanes Using Alcohols. J Org Chem 2022; 87:3989-4000. [PMID: 35258302 DOI: 10.1021/acs.joc.1c02702] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Herein, we demonstrated Mn-catalyzed selective C-3 functionalization of indoles with alcohols. The developed catalyst can also furnish bis(indolyl)methanes from the same set of substrates under slightly modified reaction conditions. Mechanistic studies reveal that the C-3 functionalization of indoles is going via a borrowing hydrogen pathway. To highlight the practical utility, a diverse range of substrates including nine structurally important drug molecules are synthesized. Furthermore, we also introduced a one-pot cascade strategy for synthesizing C-3 functionalized indoles directly from 2-aminophenyl ethanol and alcohol.
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Affiliation(s)
- Avijit Mondal
- Department of Chemistry, Indian Institute of Technology-Guwahati, Kamrup, Assam 781039, India
| | - Rahul Sharma
- Department of Chemistry, Indian Institute of Technology-Guwahati, Kamrup, Assam 781039, India
| | - Bishal Dutta
- Department of Chemistry, Indian Institute of Technology-Guwahati, Kamrup, Assam 781039, India
| | - Debjyoti Pal
- Department of Chemistry, Indian Institute of Technology-Guwahati, Kamrup, Assam 781039, India
| | - Dipankar Srimani
- Department of Chemistry, Indian Institute of Technology-Guwahati, Kamrup, Assam 781039, India
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Pal D, Mondal A, Srimani D. Well-defined manganese complex catalyzed dehydrogenative synthesis of quinazolin-4(3 H)-ones and 3,4-dihydro-2 H-1,2,4-benzothiadiazine 1,1-dioxides. Catal Sci Technol 2022. [DOI: 10.1039/d2cy00260d] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The synthesis of N-heterocycles has been considered an emerging topic of chemical research due to its widespread usage in medicinal chemistry, materials science, and natural product synthesis.
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Affiliation(s)
- Debjyoti Pal
- Department of Chemistry, Indian Institute of Technology-Guwahati, Kamrup, Assam 781039, India
| | - Avijit Mondal
- Department of Chemistry, Indian Institute of Technology-Guwahati, Kamrup, Assam 781039, India
| | - Dipankar Srimani
- Department of Chemistry, Indian Institute of Technology-Guwahati, Kamrup, Assam 781039, India
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14
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Hatua K, Das HS, Mondal A, Nandi PK. Electronic second hyperpolarizability of alkaline earth metal chains end capped with −NH2 and –CN. J INDIAN CHEM SOC 2021. [DOI: 10.1016/j.jics.2021.100234] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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15
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Mondal A, Sharma R, Pal D, Srimani D. Manganese catalyzed switchable C-alkylation/alkenylation of fluorenes and indene with alcohols. Chem Commun (Camb) 2021; 57:10363-10366. [PMID: 34541595 DOI: 10.1039/d1cc03529k] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
The usage of earth-abundant, nontoxic transition metals in place of rare noble metals is a central goal in catalysis. This would be especially interesting when the reactivity and selectivity patterns can be tuned. Herein, we introduced the first Mn-catalyzed selective C-alkylation and olefination of fluorene, and indene with alcohols. Various substrates including benzylic, heteroaromatic, and aliphatic primary and secondary alcohols are employed as alkylating agents. Mechanistic investigations and a kinetic study underpin the involvement of the olefinated intermediate to furnish the alkylated product.
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Affiliation(s)
- Avijit Mondal
- Department of Chemistry, Indian Institute of Technology-Guwahati, Kamrup, Assam 781039, India.
| | - Rahul Sharma
- Department of Chemistry, Indian Institute of Technology-Guwahati, Kamrup, Assam 781039, India.
| | - Debjyoti Pal
- Department of Chemistry, Indian Institute of Technology-Guwahati, Kamrup, Assam 781039, India.
| | - Dipankar Srimani
- Department of Chemistry, Indian Institute of Technology-Guwahati, Kamrup, Assam 781039, India.
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16
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Bhandare MS, Mondal A, Chaudhari V, Bal M, Yadav S, Ramaswamy A, Ostwal V, Shetty N, Shrikhande SV. Factors influencing local and distant recurrence following resection of periampullary cancer. Br J Surg 2021; 108:427-434. [PMID: 33723577 DOI: 10.1093/bjs/znaa143] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2020] [Revised: 06/27/2020] [Accepted: 11/24/2020] [Indexed: 12/13/2022]
Abstract
BACKGROUND Recurrence of periampullary cancer after pancreatoduodenectomy is common. The aim of this study was to investigate patterns of recurrence, incidence, and factors associated with local and distant recurrences. METHODS This retrospective, single-centre study included consecutive patients with periampullary cancer who underwent resection with curative intent from January 2012 to January 2018. Survival, patterns of recurrence, and factors associated with recurrences were analysed. RESULTS Median overall survival (OS) and disease-free survival among 398 included patients was 58.4 and 49.5 months respectively. Twenty-three patients (5.8 per cent) developed isolated local recurrences (LR), 50 (12.6 per cent) developed LR along with distant metastasis (DM), and 103 (25.9 per cent) developed isolated DM. Median OS was 40.4 months for patients with isolated LR versus 23 months for those with DM (P < 0.001). Tumour subtype (distal common bile duct (CBD): odds ratio (OR) 6.18, 95 per cent c.i. 2.19 to 17.46) and node-positive status (OR 2.36, 1.26 to 4.43) were independently associated with higher rates of LR. The most common site for isolated LR was along the superior mesenteric artery (12 of 23 patients). Tumour subtype (distal CBD: OR 2.86, 1.09 to 7.52), nodal positivity (OR 2.46, 1.53 to 3.94), and presence of perineural invasion (OR 1.80, 1.02 to 3.18) were independently associated with DM. CONCLUSION Isolated LR is associated with better survival than DM and occurs most commonly along the superior mesenteric artery.
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Affiliation(s)
- M S Bhandare
- Gastrointestinal and Hepato-Pancreato-Biliary Service, Department of Surgical Oncology, Tata Memorial Hospital, Homi Bhabha National Institute, Mumbai, India
| | - A Mondal
- Gastrointestinal and Hepato-Pancreato-Biliary Service, Department of Surgical Oncology, Tata Memorial Hospital, Homi Bhabha National Institute, Mumbai, India
| | - V Chaudhari
- Gastrointestinal and Hepato-Pancreato-Biliary Service, Department of Surgical Oncology, Tata Memorial Hospital, Homi Bhabha National Institute, Mumbai, India
| | - M Bal
- Department of Pathology, Tata Memorial Hospital, Homi Bhabha National Institute, Mumbai, India
| | - S Yadav
- Department of Pathology, Tata Memorial Hospital, Homi Bhabha National Institute, Mumbai, India
| | - A Ramaswamy
- Department of Medical Oncology, Tata Memorial Hospital, Homi Bhabha National Institute, Mumbai, India
| | - V Ostwal
- Department of Medical Oncology, Tata Memorial Hospital, Homi Bhabha National Institute, Mumbai, India
| | - N Shetty
- Department of Intervention Radiology, Tata Memorial Hospital, Homi Bhabha National Institute, Mumbai, India
| | - S V Shrikhande
- Gastrointestinal and Hepato-Pancreato-Biliary Service, Department of Surgical Oncology, Tata Memorial Hospital, Homi Bhabha National Institute, Mumbai, India
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Mondal A, Sharma R, Pal D, Srimani D. Recent Progress in the Synthesis of Heterocycles through Base Metal‐Catalyzed Acceptorless Dehydrogenative and Borrowing Hydrogen Approach. European J Org Chem 2021. [DOI: 10.1002/ejoc.202100517] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Avijit Mondal
- Department of Chemistry Indian Institute of Technology Guwahati, Assam Kamrup (Rural) 781039 India
| | - Rahul Sharma
- Department of Chemistry Indian Institute of Technology Guwahati, Assam Kamrup (Rural) 781039 India
| | - Debjyoti Pal
- Department of Chemistry Indian Institute of Technology Guwahati, Assam Kamrup (Rural) 781039 India
| | - Dipankar Srimani
- Department of Chemistry Indian Institute of Technology Guwahati, Assam Kamrup (Rural) 781039 India
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Mondal A, Bhat IA, Karunakaran S, De M. Supramolecular Interaction of Molecular Cage and β-Galactosidase: Application in Enzymatic Inhibition, Drug Delivery and Antimicrobial Activity. Chembiochem 2021; 22:1955-1960. [PMID: 33817948 DOI: 10.1002/cbic.202100008] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2021] [Revised: 03/31/2021] [Indexed: 12/20/2022]
Abstract
Enzyme inhibitors play a crucial role in diagnosis of a wide spectrum of diseases related to bacterial infections. We report here the effect of a water-soluble self-assembled PdII 8 molecular cage towards β-galactosidase enzyme activity. The molecular cage is composed of a tetrapyridyl donor (L) and cis-[(en)Pd(NO3 )2 ] (en=ethane-1,2-diamine) acceptor and it has a hydrophobic internal cavity. We have observed that the acceptor moiety mainly possesses the ability to inactivate the β-galactosidase enzyme activity. Kinetic investigation revealed the mixed mode of inhibition. This inhibition strategy was extended to control the growth of methicillin-resistant Staphylococcus aureus. The internalization of the Pd(II) cage inside the bacteria was confirmed when bacterial solutions were incubated with curcumin loaded cage. The intrinsic green fluorescence of curcumin made the bacteria glow when put under an optical microscope. Furthermore, this curcumin loaded molecular cage shows an enhanced antibacterial activity. Thus, PdII 8 molecular cage is quite attractive due to its dual role as enzyme inhibitor and drug carrier.
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Affiliation(s)
- Avijit Mondal
- Department of Organic Chemistry, Indian Institute of Science, Bangalore, 560012, India
| | - Imtiyaz Ahmad Bhat
- Department of Inorganic and Physical Chemistry, Indian Institute of Science, Bangalore, 560012, India
| | - Subbaraj Karunakaran
- Department of Organic Chemistry, Indian Institute of Science, Bangalore, 560012, India
| | - Mrinmoy De
- Department of Organic Chemistry, Indian Institute of Science, Bangalore, 560012, India
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Affiliation(s)
- Ramen Jamatia
- Department of Chemistry Indian Institute of Technology-Guwahati Kamrup Assam 781039 India
| | - Avijit Mondal
- Department of Chemistry Indian Institute of Technology-Guwahati Kamrup Assam 781039 India
| | - Dipankar Srimani
- Department of Chemistry Indian Institute of Technology-Guwahati Kamrup Assam 781039 India
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Kamsheh A, Edelson J, Quarshie W, Faerber J, Mondal A, Burstein D, Wittlieb Weber C, Lin K, Maeda K, Mascio C, Gaynor J, Chen J, Fuller S, Goldsmith M, O'Connor M, Birati E, Rossano J. Mechanical Circulatory Support in Pediatric Myocarditis: Utilization and Patient Outcomes. J Heart Lung Transplant 2021. [DOI: 10.1016/j.healun.2021.01.510] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022] Open
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21
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Ward TL, Raybould SJ, Mondal A, Lambert J, Patel B. Predicting the length of stay at admission for emergency general surgery patients a cohort study. Ann Med Surg (Lond) 2021; 62:127-130. [PMID: 33520208 PMCID: PMC7819802 DOI: 10.1016/j.amsu.2021.01.011] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2020] [Revised: 01/08/2021] [Accepted: 01/09/2021] [Indexed: 11/30/2022] Open
Abstract
Introduction Predicting length of stay (LOS) is beneficial to patients and the health service. When a prolonged LOS is predicted, it gives the opportunity for focused therapies and allocation of resources to reduce this period. In emergency general surgery (EGS) there has been limited investigation of variables that may be important predictors of LOS. This study examines social characteristics alongside measures of severity of acute illness and co-morbidities in an adult EGS population to establish their contribution to LOS. Methods Data were collected prospectively from patients at admission including medical variables, demographics, and therapeutic requirements. The length of hospital admission was measured, and multiple regression analysis was used to identify variables which predicted the LOS. Results Data were collected from 105 patients. The regression model gave an R2 of 0.34, p = 0.0006. Barthal index (measure of independence in activities of daily living) was a significant predictor of LOS [logworth 1.649, p0.02243]. Housing status and Level of social support both correlated in one-way analysis with LOS. Conclusion There are non-surgical variables, measurable at admission which are of significant value in predicting LOS of EGS patients. This warrants further investigation through a larger study to better quantify the contributions of these variables, and establish potential early interventions to reduce the LOS. Barthal Index is a significant predictor of length of stay at admission for patients admitted under EGS. Unstable housing and a lack of social support independently correlate with a longer length of stay. It may be possible to intervene at admission to reduce the length of stay for patients admitted under EGS.
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Affiliation(s)
- T L Ward
- Barts and the London SMD, Dept. Surgery and Surgical Skills, Barts Cancer Institute, London, UK
| | - S J Raybould
- St Helen's and Knowsley Teaching Hospitals, Department of Anaesthetics, Prescot, UK
| | - A Mondal
- Barts and the London SMD, Dept. Surgery and Surgical Skills, Barts Cancer Institute, London, UK
| | - J Lambert
- Homerton University Hospitals Foundation Trust, Department of Surgery, Homerton Row, London, E9 6SR, UK
| | - B Patel
- Barts and the London SMD, Dept. Surgery and Surgical Skills, Barts Cancer Institute, London, UK.,Royal London Hospital, Barts Health NHS Trust, Whitechapel Road, London, E1 1FR, UK
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Abstract
In today’s era Internet worm is a giant threat to the network infrastructure. Although there are different strategies to sense those hazard at early stages. They detect using some signature based approach. But when novel attacks come into the structure, it is very hard to detect them as they do not have any previous signature. For those some signature based methodology is used. In our work we have reviewed different strategies of internet worm detection and prevention and this article also explores the existing techniques to automate signatures for network worms.
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Lieb JA, Mondal A, Fehm T, Hampl M. Schwangerschafts- und Geburtskomplikationen sowie Rezidivrate nach gewebeschonender LEEP bei Zervixdysplasien. Geburtshilfe Frauenheilkd 2020. [DOI: 10.1055/s-0040-1717164] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022] Open
Affiliation(s)
- JA Lieb
- Klinik für Gynäkologie und Geburtshilfe, Universitätsklinikum Düsseldorf
| | - A Mondal
- Klinik für Gynäkologie und Geburtshilfe, Universitätsklinikum Düsseldorf
| | - T Fehm
- Klinik für Gynäkologie und Geburtshilfe, Universitätsklinikum Düsseldorf
| | - M Hampl
- Klinik für Gynäkologie und Geburtshilfe, Universitätsklinikum Düsseldorf
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Bark V, Mondal A, Hampl M. Regressionsraten von CIN 2/CIN 3 bei Frauen unter 25 Jahren. Geburtshilfe Frauenheilkd 2020. [DOI: 10.1055/s-0040-1718120] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022] Open
Affiliation(s)
- V Bark
- Klinik für Frauenheilkunde und Geburtshilfe
| | - A Mondal
- Klinik für Frauenheilkunde und Geburtshilfe
| | - M Hampl
- Klinik für Frauenheilkunde und Geburtshilfe
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Edwards J, Edelson J, Katcoff H, Mondal A, Reza N, Griffis H, Ravishankar C, Rossano J, Lin K, Birati E. Age-Dependent Emergency Department Resource Utilization in Patients with a Ventricular Assist Device. J Heart Lung Transplant 2020. [DOI: 10.1016/j.healun.2020.01.318] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022] Open
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26
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Edelson J, Edwards J, Katcoff H, Mondal A, Reza N, Mazurek J, Wald J, Griffis H, Burstein D, Rossano J, Lin K, Birati E. Epidemiology of Patients with Ventricular Assist Devices Presenting to the Emergency Room from 2006-2014. J Heart Lung Transplant 2020. [DOI: 10.1016/j.healun.2020.01.362] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
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Kumar A, Srivastava AK, Gangwar SK, Misra N, Brahmachari G, Mondal A, Mondal S. FT-IR, UV–visible, and NMR Spectral Analyses, Molecular Structure, and Properties of Nevadensin Revealed by Density Functional Theory and Molecular Docking. Polycycl Aromat Compd 2020. [DOI: 10.1080/10406638.2018.1458741] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Affiliation(s)
- Abhishek Kumar
- Department of Physics, University of Lucknow, Lucknow, Uttar Pradesh, India
| | - Ambrish Kumar Srivastava
- P. G. Department of Physics, Veer Kunwar Singh University, Ara, Bihar, India
- Laboratory of Natural Products & Organic Synthesis, Department of Chemistry, Visva-Bharati (a Central University), Santiniketan, West Bengal, India
| | | | - Neeraj Misra
- Department of Physics, University of Lucknow, Lucknow, Uttar Pradesh, India
| | - Goutam Brahmachari
- P. G. Department of Physics, Veer Kunwar Singh University, Ara, Bihar, India
- Laboratory of Natural Products & Organic Synthesis, Department of Chemistry, Visva-Bharati (a Central University), Santiniketan, West Bengal, India
| | - Avijit Mondal
- P. G. Department of Physics, Veer Kunwar Singh University, Ara, Bihar, India
- Laboratory of Natural Products & Organic Synthesis, Department of Chemistry, Visva-Bharati (a Central University), Santiniketan, West Bengal, India
| | - Sadan Mondal
- P. G. Department of Physics, Veer Kunwar Singh University, Ara, Bihar, India
- Laboratory of Natural Products & Organic Synthesis, Department of Chemistry, Visva-Bharati (a Central University), Santiniketan, West Bengal, India
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Brahmachari G, Mandal B, Mandal M, Mondal A. Sopherone A and B: Two new biologically relevant dibenzo-α-pyrones from Cassia sophera. Fitoterapia 2019; 136:104169. [DOI: 10.1016/j.fitote.2019.05.008] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2019] [Revised: 05/05/2019] [Accepted: 05/06/2019] [Indexed: 01/01/2023]
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Das K, Mondal A, Pal D, Srimani D. Sustainable Synthesis of Quinazoline and 2-Aminoquinoline via Dehydrogenative Coupling of 2-Aminobenzyl Alcohol and Nitrile Catalyzed by Phosphine-Free Manganese Pincer Complex. Org Lett 2019; 21:3223-3227. [DOI: 10.1021/acs.orglett.9b00939] [Citation(s) in RCA: 61] [Impact Index Per Article: 12.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Kalicharan Das
- Department of Chemistry, Indian Institute of Technology-Guwahati, Kamrup, Assam 781039, India
| | - Avijit Mondal
- Department of Chemistry, Indian Institute of Technology-Guwahati, Kamrup, Assam 781039, India
| | - Debjyoti Pal
- Department of Chemistry, Indian Institute of Technology-Guwahati, Kamrup, Assam 781039, India
| | - Dipankar Srimani
- Department of Chemistry, Indian Institute of Technology-Guwahati, Kamrup, Assam 781039, India
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Das K, Mondal A, Pal D, Srivastava HK, Srimani D. Phosphine-Free Well-Defined Mn(I) Complex-Catalyzed Synthesis of Amine, Imine, and 2,3-Dihydro-1H-perimidine via Hydrogen Autotransfer or Acceptorless Dehydrogenative Coupling of Amine and Alcohol. Organometallics 2019. [DOI: 10.1021/acs.organomet.9b00131] [Citation(s) in RCA: 53] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Affiliation(s)
- Kalicharan Das
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati 781039, Assam, India
| | - Avijit Mondal
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati 781039, Assam, India
| | - Debjyoti Pal
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati 781039, Assam, India
| | - Hemant Kumar Srivastava
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati 781039, Assam, India
| | - Dipankar Srimani
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati 781039, Assam, India
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Mondal A, Hatua K, Nandi PK. Why lithiation results large enhancement of second hyperpolarizability of delta shaped complexes M-C2H2 (M = Be, Mg and Ca)? Chem Phys Lett 2019. [DOI: 10.1016/j.cplett.2019.01.055] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Mondal A, Rodriguez-Florez N, O’Hara JL, Ong J, Jeelani N, Dunaway DJ, James G. WPI-13 Lack of association of cranial lacunae with intracranial hypertension in children with crouzon syndrome and apert syndrome: a 3D morphometric quantitative analysis. J Neurol Neurosurg Psychiatry 2019. [DOI: 10.1136/jnnp-2019-abn.14] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
ObjectivesCranial lacunae on CT is equivalent to the plain X-ray ‘copper beating’ seen in craniosynostosis. Copper beating has not been shown to correlate to intracranial hypertension (IH). However it is a purely quantitative assessment – can qualitative measurement of CT cranial lacunae more accurately predict IH in children with craniosynostosis?DesignRetrospective cohort study.Subjects18 consecutive children with Crouzon and 17 with Apert syndrome were identified.MethodsPatients were divided into IH and non-IH groups defined on an intention to treat basis. 3D software was used to analyse% of calvarial lacunae.ResultsMean age at CT scan was 380 days (range 6–1778). Of the 35 children, 21 required surgery for raised ICP (17 posterior vault expansion 2 ventriculo-peritoneal shunts (VPS), 1 spring-assisted cranioplasty and 1 fronto-orbital advancement) at mean age of 512 days (range 38–1710). Of the 21 children with raised ICP, 15 had lacunae with mean lacuna/calvarium percentage of 3% (0%–28%). Of the 14 non-raised ICP children, 8 had lacunae with mean lacuna/calvarium percentage of 2% (0%–8%). T-test demonstrated no significant difference between the 2 groups. For both groups, parietal bones were most likely to show lacunae (IH 14/21, non-IH 9/14), followed by occipital (IH 8/21, non-IH 3/14), followed by frontal (IH 6/21, non-IH 2/14).ConclusionsResults suggest that cranial lacunae, measured using quantitative 3D methods, do not predict IH, in agreement with evidence from qualitative plain skull radiograph studies.
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Sarkar S, Mondal A, Giri N, Ray R. Spin glass like transition and the exchange bias effect in Co 3O 4 nanoparticles anchored onto graphene sheets. Phys Chem Chem Phys 2018; 21:260-267. [PMID: 30519700 DOI: 10.1039/c8cp06659k] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We have synthesized Co3O4 nanoparticles having 40 nm average size, which are anchored on reduced graphene oxide. X-ray diffraction, FESEM, TEM and Raman spectroscopy are performed for the characterization. The temperature dependence of field cooled (FC) and zero field cooled (ZFC) magnetization curves exhibits antiferromagnetic (AFM) transition around ∼30 K, as observed for bulk Co3O4. The exchange bias effect is observed below ∼30 K. A significant change in the exchange bias effect is noted around ∼8 K, which is close to a spin-glass-like transition. The spin-glass-like phase has been confirmed by the memory effects observed by different experimental protocols. The possible origin of exchange bias is discussed in the manuscript.
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Affiliation(s)
- S Sarkar
- Department of Physics, Jadavpur University, Kolkata 700 032, India.
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Bartens A, Fehm T, Mondal A, Hampl M. Vulvakarzinom in der Schwangerschaft – Management anhand von Case Reports. Geburtshilfe Frauenheilkd 2018. [DOI: 10.1055/s-0038-1671225] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022] Open
Affiliation(s)
- A Bartens
- Universitätsklinikum Düsseldorf, Frauenheilkunde und Geburtshilfe, Düsseldorf, Deutschland
| | - T Fehm
- Universitätsklinikum Düsseldorf, Frauenheilkunde und Geburtshilfe, Düsseldorf, Deutschland
| | - A Mondal
- Universitätsklinikum Düsseldorf, Frauenheilkunde und Geburtshilfe, Düsseldorf, Deutschland
| | - M Hampl
- Universitätsklinikum Düsseldorf, Frauenheilkunde und Geburtshilfe, Düsseldorf, Deutschland
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Ghosh S, Maji S, Mondal A. Study of selective sensing of Hg2+ ions by green synthesized silver nanoparticles suppressing the effect of Fe3+ ions. Colloids Surf A Physicochem Eng Asp 2018. [DOI: 10.1016/j.colsurfa.2018.07.012] [Citation(s) in RCA: 39] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Dey S, Sahoo S, Agrawal H, Mondal A, Bhowmik T, Tiwari VN. Personalized cumulative UV tracking on mobiles & wearables. Annu Int Conf IEEE Eng Med Biol Soc 2018; 2017:2341-2344. [PMID: 29060367 DOI: 10.1109/embc.2017.8037325] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Maintaining a balanced Ultra Violet (UV) exposure level is vital for a healthy living as the excess of UV dose can lead to critical diseases such as skin cancer while the absence can cause vitamin D deficiency which has recently been linked to onset of cardiac abnormalities. Here, we propose a personalized cumulative UV dose (CUVD) estimation system for smartwatch and smartphone devices having the following novelty factors; (a) sensor orientation invariant measurement of UV exposure using a bootstrap resampling technique, (b) estimation of UV exposure using only light intensity (lux) sensor (c) optimal UV exposure dose estimation. Our proposed method will eliminate the need for a dedicated UV sensor thus widen the user base of the proposed solution, render it unobtrusive by eliminating the critical requirement of orienting the device in a direction facing the sun. The system is implemented on android mobile platform and validated on 1200 minutes of lux and UV index (UVI) data collected across several days covering morning to evening time frames. The result shows very impressive final UVI estimation accuracy. We believe our proposed solution will enable the future wearable and smartphone users to obtain a seamless personalized UV exposure dose across a day paving a way for simple yet very useful recommendations such as right skin protective measure for reducing risk factors of long term UV exposure related diseases like skin cancer and, cardiac abnormality.
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Das K, Mondal A, Srimani D. Selective Synthesis of 2-Substituted and 1,2-Disubstituted Benzimidazoles Directly from Aromatic Diamines and Alcohols Catalyzed by Molecularly Defined Nonphosphine Manganese(I) Complex. J Org Chem 2018; 83:9553-9560. [DOI: 10.1021/acs.joc.8b01316] [Citation(s) in RCA: 96] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Affiliation(s)
- Kalicharan Das
- Department of Chemistry, Indian Institute of Technology-Guwahati, Kamrup, Assam 781039, India
| | - Avijit Mondal
- Department of Chemistry, Indian Institute of Technology-Guwahati, Kamrup, Assam 781039, India
| | - Dipankar Srimani
- Department of Chemistry, Indian Institute of Technology-Guwahati, Kamrup, Assam 781039, India
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Hatua K, Mondal A, Nandi PK. Static second hyperpolarizability of inverse sandwich compounds (M 1-C 5H 5-M 2) of alkali (M 1 = Li, Na, K) and alkaline earth metals (M 2 = Be, Mg, Ca). Phys Chem Chem Phys 2018; 20:13331-13339. [PMID: 29717731 DOI: 10.1039/c8cp01210e] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
In the investigated inverse sandwich complexes, charge transfer from alkali metal (M1) led to aromatically stabilized Cp ring, which prevented further charge transfer from the alkaline earth metal (M2). This electron push effect resulted in diffusion of electron density from the outermost "ns" subshell of alkaline earth metal. The alkaline earth metal is weakly bound to the alkali metal-C5H5 complex. The vertical ionization energy of the chosen M1-Cp-M2 complexes was smaller than that of the corresponding alkaline earth metals. Large second hyperpolarizability (106-108 a.u.) was obtained for the studied molecules. The correction due to the basis set superposition error (BSSE) in the calculated second hyperpolarizability was found to be small for larger systems, while it was rather significant for small systems. The MP4SDQ and CCSD results were in fair agreement, which indicates the necessity of higher order electron correlation treatment in the accurate description of second hyperpolarizability. Calculated dynamic second hyperpolarizabilities at 1064 nm were found to increase considerably for most of the chosen metal complexes.
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Affiliation(s)
- Kaushik Hatua
- Department of Chemistry, Indian Institute of Engineering Science and Technology, Shibpur, Howrah-711103, India.
| | - Avijit Mondal
- Department of Chemistry, Indian Institute of Engineering Science and Technology, Shibpur, Howrah-711103, India.
| | - Prasanta K Nandi
- Department of Chemistry, Indian Institute of Engineering Science and Technology, Shibpur, Howrah-711103, India.
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Mondal A, Hatua K, Roy RS, Nandi PK. Successive lithiation of acetylene, ethylene and benzene: a comprehensive computational study of large static second hyperpolarizability. Phys Chem Chem Phys 2018; 19:4768-4777. [PMID: 28133649 DOI: 10.1039/c6cp07845a] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
This work is a revisit of the study of the electron correlation effect of lithium substitution on the second hyperpolarizability (106 a.u.) of acetylene, ethylene and benzene. The large quenching of mean second hyperpolarizability has been addressed by CCSD calculations. The inclusion of triple excitation in the MP4 method generally overestimates second hyperpolarizability in comparison to the MP4SDQ method. The present CCSD γav value of C6Li6: 405 × 104 a.u. obtained with a relatively larger basis set established the earlier prediction of Sadlej et al. [Phys. Chem. Phys. Chem., 2000, 2, 3393-3399] where degenerate non-dipolar transitions in low lying excited states play the crucial role. The successive lithiation results in gradual red shifting of transition energy leading to significant enhancement of second hyperpolarizability. Most of the chosen DFT functionals predict the correct qualitative trend of second hyperpolarizability. The quantitatively different results may be attributed to the case when the ground state wave function cannot be approximated by a single SD.
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Affiliation(s)
- Avijit Mondal
- Department of Chemistry, Indian Institute of Engineering Science and Technology, Shibpur, Howrah-711103, India.
| | - Kaushik Hatua
- Department of Chemistry, Indian Institute of Engineering Science and Technology, Shibpur, Howrah-711103, India.
| | - Ria Sinha Roy
- Department of Chemistry, Indian Institute of Engineering Science and Technology, Shibpur, Howrah-711103, India.
| | - Prasanta K Nandi
- Department of Chemistry, Indian Institute of Engineering Science and Technology, Shibpur, Howrah-711103, India.
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Mondal A, Chatterjee R, Datta S. Umbrella Sampling and X-ray Crystallographic Analysis Unveil an Arg-Asp Gate Facilitating Inhibitor Binding Inside Phosphopantetheine Adenylyltransferase Allosteric Cleft. J Phys Chem B 2018; 122:1551-1559. [PMID: 29345931 DOI: 10.1021/acs.jpcb.7b09543] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Phosphopantetheine adenylyltransferase (PPAT) is a rate-limiting enzyme essential for biosynthesis of coenzyme A (CoA), which in turn is responsible to regulate the secretion of exotoxins via type III secretion system in Pseudomonas aeruginosa, causing severe health concerns ranging from nosocomial infections to respiratory failure. Acetyl coenzyme A (AcCoA) is a newly reported inhibitor of PPAT, believed to regulate the cellular levels of CoA and thereby the pathogenesis. Very little is known so far regarding the mechanistic details of AcCoA binding inside PPAT-binding cleft. Herein, we have used extensive umbrella sampling simulations to decipher mechanistic insight into the inhibitor accommodation inside the binding cavity. We found that R90 and D94 residues act like a gate near the binding cavity to accommodate and stabilize the incoming ligand. Mutational models concerning these residues also show considerable difference in AcCoA-binding thermodynamics. To substantiate our findings, we have solved the first crystal structure of apo-PPAT from P. aeruginosa, which also found to agree with the simulation results. Collectively, these results describe the mechanistic details of accommodation of inhibitor molecule inside PPAT-binding cavity and also offer valuable insight into regulating cellular levels of CoA/AcCoA and thus controlling the pathogenicity.
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Affiliation(s)
- A Mondal
- Structural Biology and Bioinformatics Division, Council of Scientific and Industrial Research-Indian Institute of Chemical Biology , 4 Raja SC Mullick Road, Jadavpur, Kolkata, West Bengal 700032, India
| | - R Chatterjee
- Structural Biology and Bioinformatics Division, Council of Scientific and Industrial Research-Indian Institute of Chemical Biology , 4 Raja SC Mullick Road, Jadavpur, Kolkata, West Bengal 700032, India
| | - S Datta
- Structural Biology and Bioinformatics Division, Council of Scientific and Industrial Research-Indian Institute of Chemical Biology , 4 Raja SC Mullick Road, Jadavpur, Kolkata, West Bengal 700032, India
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Das K, Mondal A, Srimani D. Phosphine free Mn-complex catalysed dehydrogenative C–C and C–heteroatom bond formation: a sustainable approach to synthesize quinoxaline, pyrazine, benzothiazole and quinoline derivatives. Chem Commun (Camb) 2018; 54:10582-10585. [DOI: 10.1039/c8cc05877f] [Citation(s) in RCA: 106] [Impact Index Per Article: 17.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Sustainable synthesis of quinoxalines, pyrazines, benzothiazoles and quinolines catalysed by a phosphine free Mn(i) complex.
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Affiliation(s)
- Kalicharan Das
- Department of Chemistry
- Indian Institute of Technology-Guwahati
- Kamrup
- India
| | - Avijit Mondal
- Department of Chemistry
- Indian Institute of Technology-Guwahati
- Kamrup
- India
| | - Dipankar Srimani
- Department of Chemistry
- Indian Institute of Technology-Guwahati
- Kamrup
- India
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Roy RS, Mondal A, Nandi PK. Erratum to: First hyperpolarizability of cyclooctatetraene modulated by alkali and alkaline earth metals. J Mol Model 2017; 23:303. [DOI: 10.1007/s00894-017-3466-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Brahmachari G, Mondal A, Nayek N, Kumar A, Srivastava AK, Misra N. Experimental and quantum chemical studies on poriferasterol – A natural phytosterol isolated from Cassia sophera Linn. (Caesalpiniaceae). J Mol Struct 2017. [DOI: 10.1016/j.molstruc.2017.04.086] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Chaudhary RG, Tanna JA, Mondal A, Gandhare NV, Juneja HD. Silica-coated nickel oxide a core-shell nanostructure: synthesis, characterization and its catalytic property in one-pot synthesis of malononitrile derivative. ACTA ACUST UNITED AC 2017. [DOI: 10.1080/22243682.2017.1296371] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Affiliation(s)
| | - J. A. Tanna
- P.G. Department of Chemistry, Seth Kesarimal Porwal College Kamptee, Kamptee, India
| | - A. Mondal
- Inorganic Materials and Catalysis Division, CSMRI, Bhavnagar, India
| | - N. V. Gandhare
- Department of Chemistry, Nabira Science College Katol, R.T.M. Nagpur University, Nagpur, India
| | - H. D. Juneja
- P.G.T.D. Chemistry, Rashtrasant Tukdoji Maharaj Nagpur University Nagpur, Nagpur, India
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45
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Roy RS, Mondal A, Nandi PK. First hyperpolarizability of cyclooctatetraene modulated by alkali and alkaline earth metals. J Mol Model 2017; 23:93. [PMID: 28243890 DOI: 10.1007/s00894-017-3273-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2016] [Accepted: 02/06/2017] [Indexed: 11/28/2022]
Abstract
In the present investigation, the first hyperpolarizability of alkali and alkaline earth metal derivatives of cyclooctatetraene (COT) has been calculated using BHHLYP and CAM-B3LYP functional for 6-311++G(d,p), 6-311++G(3df,3pd), and aug-pc 2 basis sets. Introduction of Na/K atoms at the axial position of COT and Li, Na, K/Be, Mg, Ca metal atoms and cyanide groups at the equatorial sites leads to lager enhancement of first hyperpolarizability. The ring charge density can account for the variation of first hyperpolarizability. The two state model has been invoked to explain the variation of first hyperpolarizability.
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Affiliation(s)
- Ria Sinha Roy
- Department of Chemistry, Indian Institute of Engineering Science and Technology, Shibpur, Howrah, 711 103, India
| | - Avijit Mondal
- Department of Chemistry, Indian Institute of Engineering Science and Technology, Shibpur, Howrah, 711 103, India
| | - Prasanta K Nandi
- Department of Chemistry, Indian Institute of Engineering Science and Technology, Shibpur, Howrah, 711 103, India.
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46
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Chakrabartty S, Mondal A, Saha AK. Effect of Annealing on Optical, Electrical and Charge Trapping Properties of TiO₂ NPs Arrays. J Nanosci Nanotechnol 2017; 17:1287-1295. [PMID: 29683565] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Glancing angle deposition technique has been carried out to synthesize TiO₂ nanoparticles over SiO(x) thin film. The samples were annealed at different temperatures 550 °C and 950 °C. The average grain sizes and surface RMS roughness have been increased from 9 nm, 0.62 nm (as deposited); 21 nm, 2.47 nm (550 °C annealed) to 37 nm, 4.2 nm (950 °C annealed). Fivefold maximum increase in optical absorption has been recorded for the 950 °C annealed sample as compared to that of the as grown. The absorption and photoluminescence peaks show the red shift with an increase in annealing temperature and grain sizes. Transmission electron microscopy (TEM) has been used to investigate phases of nanoparticles. The junction capacitance of the Au/TiO₂ NPs device was observed to decrease with an increase in frequency. A minimum change in junction capacitance of 1 pF was calculated for 950 °C annealed device for the variation of frequency from 500 Hz to 1 MHz. The results are used to simulate the capacitance as a function of frequency and voltage characteristic of TiO₂ NPs based device in different temperature. Simulated results are exceptionally close to experimental results. The TiO₂ NPs based device annealed at 950 °C possessed higher impedance and lower conductance among all three type of devices. The sample annealed at 950 °C showed the maximum capacitance (0.09 pF at 0 V) as well as charge (˜0.6 Coulomb at +8 V) retention compared to that of the 550 °C annealed and as deposited samples.
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48
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Das A, Mondal A, Kumar P. A young boy with brownish papules and plaque. Indian J Paediatr Dermatol 2017. [DOI: 10.4103/2319-7250.184438] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
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49
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Kumar P, Das A, Mondal A. Secondary syphilis: An unusual presentation. Indian J Sex Transm Dis AIDS 2017. [PMID: 28442816 PMCID: PMC5389228 DOI: 10.4103/2589-0557.194318] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
Affiliation(s)
- Piyush Kumar
- Department of Dermatology, Katihar Medical College, Katihar, Bihar, India
| | - Anupam Das
- Department of Dermatology, KPC Medical College and Hospital, Kolkata, West Bengal, India,Address for correspondence: Dr. Anupam Das, “Prerana,” 19, Phoolbagan, Kolkata - 700 086, West Bengal, India. E-mail:
| | - Avijit Mondal
- Department of Dermatology, College of Medicine and JNM Hospital, Kalyani, West Bengal, India
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50
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Nair V, Madan H, Sofat S, Ganguli P, Jacob MJ, Datta R, Bharadwaj P, Sarkar RS, Pandit AJ, Nityanand S, Goel PK, Garg N, Gambhir S, George PV, Chandy S, Mathews V, George OK, Talwar KK, Bahl A, Marwah N, Bhatacharya A, Bhargava B, Airan B, Mohanty S, Patel CD, Sharma A, Bhatnagar S, Mondal A, Jose J, Srivastava A. Authors' response. Indian J Med Res 2016; 143:833. [PMID: 27748312 PMCID: PMC5094127 DOI: 10.4103/0971-5916.192081] [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] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
Affiliation(s)
- V Nair
- Army Hospital (Research & Referral), New Delhi, India
| | - H Madan
- Army Hospital (Research & Referral), New Delhi, India
| | - S Sofat
- Army Hospital (Research & Referral), New Delhi, India
| | - P Ganguli
- Army Hospital (Research & Referral), New Delhi, India
| | - M J Jacob
- Army Hospital (Research & Referral), New Delhi, India
| | - R Datta
- Military Hospital, Cardio Thoracic Centre, Pune, India
| | - P Bharadwaj
- Military Hospital, Cardio Thoracic Centre, Pune, India
| | - R S Sarkar
- Military Hospital, Cardio Thoracic Centre, Pune, India
| | - A J Pandit
- Military Hospital, Cardio Thoracic Centre, Pune, India
| | - S Nityanand
- Sanjay Gandhi Postgraduate Institute of Medical Sciences, Lucknow, India
| | - P K Goel
- Sanjay Gandhi Postgraduate Institute of Medical Sciences, Lucknow, India
| | - N Garg
- Sanjay Gandhi Postgraduate Institute of Medical Sciences, Lucknow, India
| | - S Gambhir
- Sanjay Gandhi Postgraduate Institute of Medical Sciences, Lucknow, India
| | - P V George
- Christian Medical College, Vellore, India
| | - S Chandy
- Christian Medical College, Vellore, India
| | - V Mathews
- Christian Medical College, Vellore, India
| | - O K George
- Christian Medical College, Vellore, India
| | - K K Talwar
- Postgraduate Institute of Medical Education & Research, Chandhigarh, India
| | - A Bahl
- Postgraduate Institute of Medical Education & Research, Chandhigarh, India
| | - N Marwah
- Postgraduate Institute of Medical Education & Research, Chandhigarh, India
| | - A Bhatacharya
- Postgraduate Institute of Medical Education & Research, Chandhigarh, India
| | - B Bhargava
- All India Institute of Medical Sciences, New Delhi, India
| | - B Airan
- All India Institute of Medical Sciences, New Delhi, India
| | - S Mohanty
- All India Institute of Medical Sciences, New Delhi, India
| | - C D Patel
- All India Institute of Medical Sciences, New Delhi, India
| | - A Sharma
- Department of Biotechnology, Government of India, New Delhi, India
| | - S Bhatnagar
- All India Institute of Medical Sciences, New Delhi, India
| | - A Mondal
- Institute of Nuclear Medicine & Allied Sciences, Delhi, India
| | - J Jose
- Christian Medical College, Vellore, India
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