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Kinetics studies and mechanism evolution of the epoxidation of styrene over nanoporous Au doped TS-1

100%
Saxena S., Dwivedi R., Bhadauria S., Chumbhale V., Prasad R.
Polish Journal of Chemical Technology
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2010
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vol. 12
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issue 4
72-78
EN
A kinetic investigation of the slurry phase epoxidation of styrene with hydrogen peroxide has been carried out, for the first time, over nanoporous Au doped TS-1 catalyst, in a batch reactor, in the temperature range of 313-333 K. It was found that product selectivity and the rate of reaction are greatly influenced by concentrations of styrene and hydrogen peroxide. Kinetics studies reveal that the mechanism of the reaction is of the "Redox" type. The rate equation, r = k1 k2 PO PH / (k1 PO + k2 PH) deduced, assuming a steady state involving two stage oxidation-reduction process, represent the data most satisfactorily for the conversion of styrene to styrene oxide. A tentative mechanism of the process has also been suggested.
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Comparative studies on cell stimulatory, permeabilizing and toxic effects induced in sensitive and multidrug resistant fungal strains by amphotericin B (AMB) and N-methyl-N-D-fructosyl amphotericin B methyl ester (MFAME).

100%
Szlinder-Richert J., Cybulska B., Grzybowska J., Borowski E., Prasad R.
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2000
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vol. 47
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issue 1
133-140
EN
N-Methyl-N-D-fructosyl-amphotericin B methyl ester (MFAME) is a new derivative of amphotericin B, which is characterised by low toxicity to mammalian cells and good solubility in water of its salts. The antifungal activity and effects of MFAME towards Candida albicans and Saccharomyces cerevisiae multidrug resistant MDR(+) and sensitive MDR(-) strains was compared with those of parent compound. The results obtained indicate that MDR(+) S. cerevisiae was sensitive to MFAME as well as to AMB. MFAME exhibited the same effects on fungal cells studied as parent antibiotic. The two antibiotics, depending on the dose applied induced cell stimulation, K+ efflux, and/or had a toxic effect.
3
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Multiple drug resistance in Candida albicans

86%
Prasad R., Krishna Murthy S., Gupta V., Prasad R.
Acta Biochimica Polonica
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1995
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vol. 42
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issue 4
497-504
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