Ronald R. Ray

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Biosynthesis of extracellular beta-amylase in Bacillus megaterium B6 was induced by starch, although maltodextrin was found to be the actual inducer. Amongst the carbon sources tested, glucose was found to be the most potent repressor and when added exogenously to a starch-induced culture it brought about an immediate fall in enzyme synthesis through carbon(More)
Studies on the irreversible thermoinactivation of beta-amylase from Bacillus megaterium B6 exposed to 60 degrees C revealed that the deactivation mechanism probably results from the oxidation of thiols present at the active site of the enzyme. Several attempts were made to increase its thermostability, which indicated that Mn2+ played a key role in(More)
The extracellular beta-amylase from starch induced Bacillus megaterium B6 was purified to homogeneity in a very convenient way; through molecular sieving as demonstrated by the presence of a single band of protein in SDS-PAGE and single peak in gel scanning. The molecular mass of the purified enzyme (monomer) was found to be unusually high, around 105,000(More)
Bacillus megaterium B6 ATCC 51946, a potent beta-amylase producing strain produced extracellular xylanase (EC 3.2.1.8) when cultivated in the presence of xylan as sole carbon source. The strain showed maximum xylanolytic activity after 12 h growth, and was capable of fermenting various agricultural wastes, of which under-utilized jute stalk proved to be(More)
The induction of endoglucanase of Rhizopus oryzae PR7 MTCC 9642 has been observed in cultivation medium using a batch-fermentation technique. The effect of various experimental parameters such as use various carbon sources as inducers, concentration of inducer and effect of different additives were investigated. Salicin at concentrations from 0.25 to 0.75%(More)
From 1967 to 1997, pioneering propulsion flight research activities have been conceived and conducted at the NASA Dryden Flight Research Center. Many of these programs have been flown jointly with the United States Department of Defense, industry, or the Federal Aviation Administration. Propulsion research has been conducted on the XB-70, F-111A, F-111E,(More)
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