Sudeshna Sen Roy

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Demand for microbial amylase production persists because of its immense importance in wide spectrum industries. The present work has been initiated with a goal of optimization of solid state fermentation condition for amylase using agroindustrial waste and microbial strain like B. amyloliquefaciens (MTCC 1270). In an aim to improve the productivity of(More)
Microalgal biotechnology has gained considerable importance in recent decades and its use is extending day by day into several areas like nutraceutical research, renewable energy source, production of essential biomolecules like β-carotene, astaxanthin, PUFA, bio colorant production, wastewater treatment, bioremediation and aquaculture etc. Among all these,(More)
We report a simple method for creating a nanopatterned surface with continuous variation in feature height on an elastomeric thin film. The technique is based on imprinting the surface of a film of thermo-curable elastomer (Sylgard 184), which has continuous variation in cross-linking density introduced by means of differential heating. This results in(More)
We show that the morphology of a thin polymer film spin coated directly on to a topographically patterned substrate is strongly influenced by the wettability of the substrate, in addition to other well-known parameters such as concentration of the polymer solution (c(n)), spin speed (RPM), and spin duration. Similar to spin coating on a flat surface, (1, 2)(More)
Controlled dewetting of a thin polymer film on a topographically patterned substrate is an interesting approach for aligning isotropic dewetted structures. In this article, we investigate the influence of substrate feature height (H(S)) on the dewetting pathway and final pattern morphology by studying the dewetting of polystyrene (PS) thin films on grating(More)
Composite algal mix has been used as feed supplement in nutrition of Oreochromis mossambicus and its effect on growth performance, feed efficiency, nutrient utilisation and body composition was investigated in a 12 week feeding trial. Three isonitrogenous diets containing 0 % (conventional feed, CF), 35% (value added feed, VAF) and 100% (algal feed, AF)(More)
HYPOTHESIS Dewetting pathways, kinetics and morphologies of thin films of phase separating polymer blends are governed by the relative mobilities of the two components. EXPERIMENTS We characterize the morphological transformations of the nanostructures of a PS/PMMA blend by annealing in toluene and chloroform vapors. Toluene leads to faster reorganization(More)
This paper results from an ongoing investigation of the rheology of dry and wet granular materials. We describe the different time scales involved and the related dimensionless numbers that govern dry as well as wet granular flows, with a focus to the dimensionless numbers relevant for flow in the quasistatic wet system at low confining stress. The(More)
This paper presents the rheology of weakly wetted granular materials in the slow frictional regime, using Discrete Element Method (DEM) simulations. In a split-bottom ring shear cell geometry a slow, quasi-static deformation leads to wide shear bands away from the walls. Dry non-cohesive and cohesive materials are compared in order to understand the effect(More)
Wide variability was observed for all the characters among 110 lentil accessions. Stem colour varied from normal green (45%) to purple (55%). Prominent and rudimentary tendrils were found in 60% and 40% of the accessions, respectively. Among the characters, flower colour showed the highest variation. White flower colour was observed in 49%, violet in 28%,(More)