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Search Results: 1 - 4 of 4 matches for " ANKITASH TULYANI "
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International Journal of Bioinformatics Research , 2011,
Abstract: Fermentation products are indigenous to many civilizations, and they have been produced by industriessince a long time. Saccharomyces cerevisiae S288C (commonly known as baker's yeast) is the strain mainly usedin the Glucose based fermentation industries. We have seen the use of same yeast strain at different places withdifferent Phenotypic Constraints. The way to improve the adaptability of considered strain for desired phenotypicconditions, using smart selection of genes through cybernetic modeling is illustrated. Phylogenetic homologues forall S. cerevisiae S288c Glucose Fermentation pathway genes were screened to search evolutionarily relatedfunctional domains in other yeast strains like Saccharomyces cerevisiae YJM789, Candida glabrata CBS138,Kluyveromyces lactis NRRL Y-1140, Ashbya gossypii ATCC10895 etc., which are adapted naturally in different setof environment. We observed that Saccharomyces cerevisiae YJM789, Candida glabrata CBS138, Ashbyagossypii ATCC10895, Kluyveromyces lactis NRRL Y-1140 possess highly conserved functional domains, whichcan be carefully selected based on usage. This study aims at designing an algorithm to select and incorporateevolutionary homologues for genes of a considered strain, which mostly show sub-optimal performance in thedesired set of experimental constraints. Such a consideration of native microenvironment and evolutionarycloseness in the selection of functional homologues of the entire genetic set can thus be significantly fruitful.
A Comparison of Physical Properties and Fuel Cell Performance of Nafion and Zirconium Phosphate/Nafion Composite Membranes
Chris Yang,S. Srinivasan,A. B. Bocarsly,S. Tulyani,J. B. Benziger
Physics , 2003,
Abstract: The physio-chemical properties of Nafion 115 and a composite Nafion 115/Zirconium Phosphate (25wt%) membranes are compared. The composite membrane takes up more water than Nafion at the same water activity. However, the proton conductivity of the composite membrane is slightly less than that for Nafion 115. Small angle X-ray scattering shows the hydrophilic phase domains in the composite membrane are spaced further apart than in Nafion 115, and the composite membrane shows less restructuring with water uptake. Despite the lower proton conductivity of the composite membranes they display better fuel cell performance than Nafion 115 when the fuel cell is operated under-humidified. It is suggested that the composite membrane has a greater rigidity that accounts for its improved fuel cell performance.
The Autohumidification Polymer Electrolyte Membrane Fuel Cell
J. B. Benziger,J. Moxley,S. Tulyani,A. Turner,A. B. Bocarsly,Y. G. Kevrekidis
Physics , 2003,
Abstract: A PEM fuel cell was specially constructed to determine kinetics under conditions of well-defined gas phase composition and cell temperature. Steady state multiplicity was discovered in the autohumidification PEM fuel cell, resulting from a balance between water production and water removal. Ignition was observed in the PEM fuel cell for a critical water activity of about 0.1. Ignition is a consequence of the exponential increase of proton conductivity with water activity, which creates an autocatalytic feedback between the water production and the proton conduction. The steady state current in the ignited state decreases with increasing temperature between 50 to 105 deg C. At temperatures greater than 70 deg C five steady states were observed in the PEM fuel cell. The steady state performance has been followed with variable load resistance and hysteresis loops have been mapped. The dynamics of transitions between steady states are slow about 10^3 to 10^4 s. These slow dynamics are suggested to result from a coupling of mechanical and chemical properties of the membrane electrode assembly due to swelling of the membrane with water absorption.
Surface tension model for surfactant solutions at the critical micelle concentration
S. F. Burlatsky,V. V. Atrazhev,D. V. Dmitriev,V. I. Sultanov,E. N. Timokhina,E. A. Ugolkova,S. Tulyani,A. Vincitore
Physics , 2013, DOI: 10.1016/j.jcis.2012.10.020
Abstract: A model for the limiting surface tension of surfactant solutions (surface tension at and above the critical micelle concentration, cmc) was developed. This model takes advantage of the equilibrium between the surfactant molecules on the liquid/vacuum surface and in micelles in the bulk at the cmc. An approximate analytical equation for the surface tension at the cmc was obtained. The derived equation contains two parameters, which characterize the intermolecular interactions in the micelles, and the third parameter, which is the surface area per surfactant molecule at the interface. These parameters were calculated using a new atomistic modeling approach. The performed calculations of the limiting surface tension for four simple surfactants show good agreement with experimental data (~30% accuracy). The developed model provides the guidance for design of surfactants with low surface tension values.
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