Tushar Kanti Mukherjee

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Proteins inside a cell remain in highly crowded environments, and this often affects their structure and activity. However, most of the earlier studies involving serum albumins were performed under dilute conditions, which lack biological relevance. The effect of protein-protein interactions on the structure and properties of serum albumins at physiological(More)
The concentration-dependent self-association of bovine serum albumin (BSA) and subsequent altered interaction with sodium dodecyl sulfate (SDS) has been explored by means of photoluminescence (PL) spectroscopy, dynamic light scattering (DLS), circular dichroism (CD), PL imaging, and atomic force microscopy (AFM). By using an extrinsic luminescent probe,(More)
The effect of the microenvironment of a Nafion membrane on the excited-state proton transfer (ESPT) of 2-(2'-pyridyl)benzimidazole (2PBI) has been investigated by steady-state and time-resolved fluorescence spectroscopy. The mechanism of the ESPT is found to depend remarkably on the water content of the membrane. In the protonated form of the membrane, ESPT(More)
We have investigated the dynamics and mechanistic details of the interaction between bovine serum albumin (BSA) and allylamine-capped silicon quantum dots (Si QDs) by means of fluorescence spectroscopy, circular dichroism (CD), and FTIR spectroscopy. The intrinsic fluorescence of BSA gets quenched in the presence of Si QDs due to ground-state complex(More)
Excited-state proton transfer (ESPT) of 2-(2'-pyridyl)benzimidazole (2PBI) in reverse micelles has been studied by steady-state and time-resolved fluorescence spectroscopy. The nanometer sized water pool in the n-heptane/Aerosol OT (AOT)/water microemulsion is found to promote tautomer emission of this probe, as is evident from the emergence of a Stokes(More)
Understanding and resolving the mechanisms that affect the photoluminescence (PL) of Si QDs are of great importance because of their strong potential for optoelectronic and solar cell materials. In this article, the intrinsic exciton dynamics of water-dispersed allylamine-functionalized silicon quantum dots (Si QDs) have been explored as a function of(More)
The holotype of Caliris keralensis (Vyjayandi et al. 2006) (Mantodea: Caliridinae) is reviewed along with another paratype female not listed by the authors. The male of this species is re-described in details and is assigned paratype male. Photographs of the specimens are given. Male genital complex is described for better understanding the species.
The effect of micellar environment on the excited state proton transfer (ESPT) of 2-(2'-pyridyl)benzimidazole (2PBI) has been investigated by steady state and time resolved fluorescence spectroscopy. The ESPT, which occurs to a rather small extent at pH 7, is found to be enhanced remarkably at the interface of sodium dodecyl sulfate (SDS) micelles and(More)
The origin of the excitation wavelength (λex)-dependent photoluminescence (PL) of carbon dots (CDs) is poorly understood and still remains obscured. This phenomenon is often explained on the basis of surface trap/defect states, while the effect of quantum confinement is highly neglected in the literature. Here, we have shown that the λex-dependent PL of CDs(More)
2-(2(')-Pyridyl)benzimidazole (2PBI) undergoes excited state proton transfer (ESPT) in acidic solutions, leading to a tautomer emission at 460 nm. This photoprocess has been studied using ultrafast fluorescence spectroscopic techniques in acidic neat aqueous solutions, in viscous mixtures of glycerol with water, as well as in sucrose solutions. The tautomer(More)