منابع مشابه
Lactose metabolism in Erwinia chrysanthemi.
Wild-type strains of the phytopathogenic enterobacterium Erwinia chrysanthemi are unable to use lactose as a carbon source for growth although they possess a beta-galactosidase activity. Lactose-fermenting derivatives from some wild types, however, can be obtained spontaneously at a frequency of about 5 X 10(-7). All Lac+ derivatives isolated had acquired a constitutive lactose transport system...
متن کاملFactors in the Metabolism of Lactose
It has been established that the tolerance for galactose is less than for lactose and considerably less than for glucose. The criterion taken in this regard has usually been the amount of the substance that could be ingested without causing melituria. In view of the possible effects of different renal thresholds, a consideration of the effects on the basis of blood pictures should be of interes...
متن کاملLactose and melibiose metabolism in Erwinia chrysanthemi.
A Lac+ mutant of Erwinia chrysanthemi was isolated from the Lac- wild type on lactose agar. beta-Galactosidase was expressed independently of lactose transport in both the mutant and the wild type, and neither strain expressed thiogalactoside transacetylase. Lactose transport and alpha-galactosidase, constitutive in the Lac+ strain, were coordinately induced in the Lac- strain by melibiose and ...
متن کاملFactors in the Metabolism of Lactose
The interest pertaining to lactose, because it is the carbohydrate in the diet of the nursling, is magnified by virtue of a number of other more or less related considerations. Half of its molecule is composed of galactose, to which is attributed the importance of serving as a source of certain essential tissue constituents, particularly those of the nervous system. Is it to be concluded that t...
متن کاملInfluence of lactose on phosphate metabolism in rats.
1. Lactose, sucrose or maltose were administered to rats by gavage together with 32PO4, and blood 32P was determined. 2. PO4 uptake into blood was increased only when lactose and PO4 were administered into the gut. 3. Weaned male rats were fed on a control diet or a diet containing 30, 60 or 120 g lactose/kg. After a 5 d period of adaptation, a 6 d P balance was carried out. After a further 24 ...
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ژورنال
عنوان ژورنال: Journal of Biological Chemistry
سال: 1954
ISSN: 0021-9258
DOI: 10.1016/s0021-9258(18)65646-7