A5020902663- Photochemistry and Electron Transfer Studies
- Spectroscopy and Quantum Chemical Studies
- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Free Radicals and Antioxidants
- Protein Interaction Studies and Fluorescence Analysis
- Porphyrin and Phthalocyanine Chemistry
- Lipid Membrane Structure and Behavior
- Surfactants and Colloidal Systems
- Atomic and Molecular Physics
- Photochromic and Fluorescence Chemistry
- Advanced Chemical Physics Studies
- Luminescence and Fluorescent Materials
- Protein Structure and Dynamics
- RNA Interference and Gene Delivery
- Photosynthetic Processes and Mechanisms
- Nuclear physics research studies
- International Business and FDI
- Photoreceptor and optogenetics research
- DNA and Nucleic Acid Chemistry
- Chemical Reactions and Mechanisms
- Advanced biosensing and bioanalysis techniques
- Microfluidic and Capillary Electrophoresis Applications
- Electrochemical Analysis and Applications
- Electron Spin Resonance Studies
West Bengal State University
2016-2025
Institute of Post Graduate Medical Education and Research
2023
Creative Commons
2023
Indian Institute of Science Bangalore
2022
University of Calcutta
2021
Indian Institute of Management Calcutta
1996-2017
Laboratoire de Biophotonique et Pharmacologie
2012
Université de Strasbourg
2009-2012
Centre National de la Recherche Scientifique
2008-2012
Bhabha Atomic Research Centre
2012
Based on inductive reasoning—case evidence from Indian family business groups and the authors' experience with businesses in India—this article explores impact succession performance of to a nonfamily professional manager as compared member, commonly referred professionalization management. An important distinction is drawn between family-owned managed professionally businesses. Then, drawing case studies process three groups, puts forth five propositions pertaining management performance....
The archetypical fluorescent nucleoside analog, 2-aminopurine (2Ap), has been used in countless assays, though it suffers from very low quantum yield, especially when included double strands, and the fact that its residual emission frequently does not represent biologically relevant conformations. To conquer 2Ap's deficiencies, deoxythienoguanosine (d(th)G) was recently developed. Here, steady-state time-resolved fluorescence spectroscopy to compare ability of 2Ap d(th)G, substitute provide...
Oral delivery of rifampicin through chitosan nanoparticles.
Fluorescent amino acids bearing environment-sensitive fluorophores are highly valuable tools for site-selective probing of peptide/ligand interactions. Herein, we synthesized a fluorescent l-amino acid the 4′-methoxy-3-hydroxyflavone fluorophore (M3HFaa) that shows dual emission, as result an excited state intramolecular proton transfer (ESIPT). The emission M3HFaa was found to be substantially more sensitive hydration compared previous analogues. By replacing Ala30 and Trp37 residues HIV-1...
Ethyl p-(dimethylamino)cinnamate (EDAC) has been used as a fluorescence probe for monitoring the interaction between model water-soluble protein, bovine serum albumin (BSA), and an anionic surfactant, sodium dodecyl sulfate (SDS). The EDAC undergoes intramolecular charge transfer (ICT) in excited state water other polar solvents. emission from ICT becomes more intense blue-shifted due to reduced polarity hydrophobic environments of BSA SDS micelles relative that pure water. intensity...
To realize a customizable biogenic delivery platform, herein we propose combining cell-derived extracellular vesicles (EVs) derived from breast cancer cell line MCF-7 with synthetic cationic liposomes using fusogenic agent, polyethylene glycol (PEG). We performed fluorescence resonance energy transfer (FRET)-based lipid-mixing assay varying PEG 1000 concentrations (0%, 15%, and 30%) correlated flow cytometry-based analysis supported by dimensional dynamic light scattering (DLS), transmission...
Charge separation is at the heart of solar energy applications, and efficient materials require fast photoinduced electron transfer (ET) slow charge recombination (CR). Using time-dependent self-consistent density functional tight-binding theory combined with nonadiabatic (NA) molecular dynamics, we report a detailed analysis ET CR in hybrids composed photoactive covalent organic polyhedra (COP) encapsulated fullerenes. The occurs on subpicosecond time scale accelerates increasing fullerene...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructure, spectroscopic, and redox properties of Rhodobacter sphaeroides reaction centers bearing point mutations near the primary electron donorJosef Wachtveitl, Joseph W. Farchaus, Ranjan Das, Marc Lutz, Bruno Robert, Tony A. MattioliCite this: Biochemistry 1993, 32, 47, 12875–12886Publication Date (Print):November 1, 1993Publication History Published online1 May 2002Published inissue 1 November...
The photophysics of a ratiometric fluorescent probe, N-[[4'- N, N-diethylamino-3-hydroxy-6-flavonyl]methyl]- N-methyl- N-(3-sulfopropyl)-1-dodecanaminium, inner salt (F2N12S), incorporated into phospholipid unilamellar vesicles is presented. reconstructed time-resolved emission spectra (TRES) unravels unique feature in the this probe. TRES exhibit signatures both an excited-state intramolecular proton transfer (ESIPT) and dynamic Stokes shift associated with solvent relaxation lipid bilayer....
The energetics of ground and excited state proton transfer in an isolated 4-methyl-2,6-diformylphenol molecule has been systematically studied by the configuration interaction method at AM1 level approximation. singlet triplet are predicted to have rather large activation barriers on respective paths while barrier height is much lower corresponding surface. process be endothermic exothermic more so state. From analysis under-barrier vibrational levels supported asymmetric double-well...
The photophysics of 2-(2′-benzofuryl)-3-hydroxychromone (BFHC) is remarkably modulated in its complexes with macrocyclic hosts such as β-cyclodextrin (β-CD), hydroxypropyl-β-cyclodextrin (HP-β-CD) and methyl-β-cyclodextrin (M-β-CD). BFHC exhibits dual emission bands, attributable to excited normal (N*) tautomer (T*) forms, where the latter originates from former through an excited-state intramolecular proton transfer (ESIPT) reaction. Fluorescence lifetimes tautomer, along intensity ratio...
The maintenance of cell membrane fluidity is critical importance for various cellular functions. At lower temperatures when decreases, plants and cyanobacteria react by introducing unsaturation in the lipids, so that membranes return to a more fluidic state. To probe how introduction leads reduced fluidity, model cationic lipid dioctadecyldimethylammonium bromide (DODAB) has been chosen, effects an unsaturated monoolein (MO) on structural dynamics phase behavior DODAB have monitored...
The dynamics of the excited-state intramolecular proton-transfer (ESIPT) reaction 2-(2'-furyl)-3-hydroxychromone (FHC) was studied in micelles by time-resolved fluorescence. FHC found to be sensitive hydration and charge micelles, demonstrated through a decrease ESIPT rate constant (k(PT)) sequence cationic → nonionic anionic micelles. A remarkably slow with time (τ(PT)) ~100 ps observed sodium dodecyl sulfate tetradecyl whereas it quite fast (τ(PT) ≈ 15 ps) cetyltrimethylammonium bromide...
Relaxation dynamics at the surface of biologically important macromolecules is taking into account their functionality in molecular recognition. Over years it has been shown that solvation a fluorescent probe biomolecular surfaces and interfaces for relaxation polar residues associated water molecules. However, sensitivity depends largely on localization exposure probe. For noncovalent probes, region interest addition to an added challenge compared covalently attached probes biological...
The molecule 4-methyl-2,6-dicarbomethoxyphenol (CMOH) which undergoes ultrafast excited-state intramolecular proton transfer (ESIPT) has been employed as a guest to probe ESIPT within the interior of host α- and β-cyclodextrins (CDx) in water highly polar nonaqueous solvents. reaction CMOH is favored its microencapsulated form both aqueous media. As consequence, resultant enhancement tautomer emission, following ESIPT, relative that homogeneous bulk media observed. forms 1:2 1:1 complexes...
Consumption of excess fluorides through drinking water and its adverse effects on human health is global concern. Given that people from at least 25 countries are suffering fluorosis, management this issue immense importance. Here, we developed a sensor called FeFlu, based an anionic micelle (SDS)–hematoporphyrin (Hp) complex, sensitized by Fe(III) chloride for the detection fluoride in water. The micelle–hematoporphyrin (SDS–Hp) complex almost nonfluorescent, but prototype (FeFlu device) it...
The temperature dependent catalytic activity of almond beta-glucosidase controlled by concerted motions loop regions (LRs).
Abstract The effect of alcohols on the proton-transfer processes in ground and excited states 4-methyl-2,6-diformylphenol (MFOH) has been investigated experimentally by steady state time resolved emission spectroscopy. It is shown that large Stokes-shifted fluorescence band due to 4-methyl-2,6-diformylphenolate anion (MFO−), except case 1-butanol. In 1-butanol single broad observed visible region assigned partially ionized species; found depend excitation wavelength. Dual only...