Nutritional versatility of a starch-utilizing Flavobacterium at low substrate concentrations
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β-galactosidase stability at high substrate concentrations
Enzymatic synthesis of galacto-oligosaccharides is usually performed at high initial substrate concentrations since higher yields are obtained. We report here on the stability of β-galactosidase from Bacillus circulans at 25, 40, and 60°C in buffer, and in systems with initially 5.0 and 30% (w/w) lactose. In buffer, the half-life time was 220 h and 13 h at 25 and 40°C, respectively, whereas the...
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C O M P l L E D BY N.-G. ASP, J. M. M. V A N AMELSVOORT A N D J. G. A. J. HAUTVAST* Applied Nutrition and Food Chemistry, Chemical Center, Lund University, P.O. Box 124, S-221 00 Lund, Sweden (N-GA), Unilever Research Laboratory, P.O. Box 114, 3 130 AC Vlaardingen, The Netherlands (JMMvA), and Department of Human Nutrition, Wageningen Agricultural University, Bomenweg 2, 6703 HD Wageningen, The...
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We previously showed using a fluorescent analogue of cholesterol (NBD-cholesterol, or 25-[N-[(7-nitrobenz-2-oxa-1,3-diazol-4-yl)-methyl]amino]-27-norcholesterol), that cholesterol may exhibit local organization at low concentrations in membranes by the formation of transbilayer tail-to-tail dimers of cholesterol (Rukmini, R., Rawat, S.S., Biswas, S.C., Chattopadhyay, A., 2001. Biophys. J. 81, 2...
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This article describes an integrated rate equation for the time course of covalent enzyme inhibition under the conditions where the substrate concentration is significantly lower than the corresponding Michaelis constant, for example, in the Omnia assays of epidermal growth factor receptor (EGFR) kinase. The newly described method is applicable to experimental conditions where the enzyme concen...
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ژورنال
عنوان ژورنال: Applied and Environmental Microbiology
سال: 1983
ISSN: 0099-2240,1098-5336
DOI: 10.1128/aem.45.3.804-810.1983