Results 261 to 270 of about 108,982 (307)

Repressible and inducible enzymic forms of dimethylnitrosamine-demethylase

Zeitschrift f�r Krebsforschung und Klinische Onkologie, 1977
Two enzymic forms, with different kinetic characteristics and responding in opposite ways to in vivo “enzyme inducer” pretreatment, underlie hepatic dimethylnitrosamine(DMN)-demethylase activity. Determination of the Hofstee plot of DMN-demethylase using a DMN substrate concentration range of 0.5 to 200 mM yields three intersecting line segments from ...
J C, Arcos, D L, Davies, C E, Brown, M F, Argus   +3 more
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Enzyme induction and repression in anabolic and catabolic pathways

Archiv f�r Mikrobiologie, 1967
Microorganisms have evolved enzymes which catalyze a large number of reactions in the sequences to form essential cellular constituents and liberate energy and carbon for cellular processes. Regulation of the use of energy and of the monomeric cellular precursors to the synthesis of those enzymes required under changing environmental conditions depends
I C, Gunsalus, A U, Bertland, L A, Jacobson   +2 more
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Biosynthese eines Enzyms. Information, Induktion, Repression

Angewandte Chemie, 1959
AbstractDie genetische und biochemische Untersuchung des Systems, das bei Escherichia coli für die Synthese der β‐Galactosidase verantwortlich ist, ergab, daß die Fähigkeit zur Enzymsynthese von einem Gen bestimmt wird, das offenbar die gesamte Information über die Struktur des Proteinmoleküls enthält. Ein zweites Gen, dem ersten unmittelbar benachbart,
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Parameters deducible from the kinetics of enzyme induction and repression

Journal of Theoretical Biology, 1967
Abstract A model of enzyme induction and repression is derived in terms of the four microscopic parameters: transcription time of the message, ribosome scanning time over a message, ribosome scanning interval in an active polyribosome and the decay constant of the message.
R D, Parker, T L, Lincoln
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Enzyme repression in the arginine pathway ofSaccharomyces cerevisiae

Antonie van Leeuwenhoek, 1969
Enzyme repression in the arginine pathway ofSaccharomyces cerevisiae was demonstrated by comparison of specific enzyme activities in yeast grown with and without arginine in various mineral salts media. Of the enzymes tested only ornithine transcarbamoylase was found to be repressed by exogenous arginine.
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Induction and repression of enzymes in microbial culture

Journal of Chemical Technology and Biotechnology, 1981
AbstractKinetic models of induction and repression of microbial enzymes are reviewed with a special emphasis on the mathematical formulation of quantitative aspects of the regulation mechanisms. In connection with this, some chemostat data have been collected from the literature.
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Enzyme Repression in Anabolic Pathways

2004
Fifty years ago, the following observation was made at the Pasteur Institute: if the wild-type of E. coli was grown in the presence of an exogenous amino acid, the content of an enzyme involved in the biosynthesis of this amino acid was significantly lower in the cell suspensions or the extracts from these bacteria. Table 1 illustrates this observation
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Glucose repression and induction of enzyme synthesis in rat liver

Advances in Enzyme Regulation, 1964
Summary Glucose has long been known as a key metabolite in intermediary metabolism. Its importance as a regulator of protein synthesis is emphasized by its ability to repress the induced synthesis of threonine dehydrase and ornithine transaminase in rat liver.
H C, Pitot, C, Peraino, N, Pries, A L, Kennan   +3 more
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Repressers, Cryptic Enzymes and Structural Genes

Nature, 1963
The Multiple Alleles at the MZ Locus. The fermentation of melezitose1 by Saccharomyces is controlled by a gene which generates a single enzyme capable of hydrolysing the five α-glucosides, namely, turanose, maltose, sucrose, α-methyl-glucoside and melezitose2.
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Periodic enzyme synthesis: Reconsideration of the theory of oscillatory repression

Journal of Theoretical Biology, 1979
Abstract The period of oscillation in a negative feedback loop is shown to be much longer than the half-life of the most stable element of the loop. This places a severe constraint on the theory that stepwise increases in enzyme activity are caused by periodic repression of enzyme synthesis.
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