Hamed Mohammed El-Shora

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The pattern and the extent of formation of proteases and secretion varied with the fungus, age and/or the nature of the co-supplement. Addition of yeast extract induced the best yield of proteases from both Aspergillus niger and A. terreus. Proteases from A. niger were highly induced by glutamic acid, alanine or albumin, with minor differences, whereas(More)
The results regarding the production of proteases fromAspergillus niger andAspergillus terreus revealed that different nitrogen complements induced different growth and enzyme productivity depending on the individual organism, nature of cosupplement and/or concentration. The two steps fermentation process increased the yield of fungal biomass and proteases.(More)
In Chenopodium album, leaf excision and light both increase urease (EC. 3.5.1.5) activity. Dithiothreitol (DTT), reduced glutathione (GSH), cysteine and diazoinedicarboxylic acid bis(N,N-dimethylamide) (diamide) activated the crude enzyme. In contrast, crude urease was inhibited by phenylmethylsulphonyl fluoride (PMSF) and Na-p -tosyl-L-lysine chloromethyl(More)
The level of glutamine synthetase (GS; EC 6.3.1.2) obtained as a function of culture age ofPenicillium cyclopium showed that GS activity increased continuously up to 120 hours after which the enzyme activity started to decline. Glutamine synthetase fromP. cyclopium was purified to homogeneity by ammonium sulphate, diethylaminoethyl (DEAE)-cellulose and(More)
The aim of this work was to determine the maximum catalytic activity and intracellular location of NADP+-linked malic enzyme (EC 1.1.1.40) in C3 plants. Appreciable activities, ranging from 80 to 712 nmol · (gFW)−1 · min−1, were found in a wide range of tissues (roots and leaves of Pisum sativum L., cotyledons of Cucurbit a pepo Alef., developing seeds of(More)
α-Glucosidase (α-D-glucoside glucohydrolase, EC 3.2.1.20) was isolated fromPenicillium notatum. The enzyme was induced by gibberellic acid (GA3). The GA3-mediated increase in the enzyme activity was repressed in presence of abscisic acid, cycloheximide and the antibiotics chloramphenicol, cordycepin, and rifampicin which are inhibitors of protein synthesis.(More)
Various microorganisms have been found to produce glucose isomerase (Deshmukh et al., 1994; Belfaquih and Penninckx., 2000; Givry and Duchiron, 2007). The conversion of glucose to fructose chemically has been known to demand high pH and temperature. The possibility of producing fructose chemically from glucose has been studied by Barker et al. (1973).(More)
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