منابع مشابه
The operon revisited.
Simple observation of living organisms allows one to conclude that the entire genetic potential of any given cell is never expressed at any given moment. In bacteria this phenomenon is termed genetic adaptation and it occurs in two apparently contradictory ways. The synthesis of enzymes responsible for a catabolic process generally appears to be turned on (induced) by the substrate (1) while fo...
متن کاملThe birth of the operon.
www.sciencemag.org SCIENCE VOL 332 13 MAY 2011 757 COVER Composite confocal image of an adult planarian (Schmidtea mediterranea) showing a growing colony of dividing cells (red) that initiated from a single, pluripotent stem cell called a clonogenic neoblast (cNeoblast). The ~1-millimeter-long animal is visualized with differential interference contrast microscopy and nuclear staining (blue). T...
متن کاملThe lac operon galactoside acetyltransferase.
Of the proteins encoded by the three structural genes of the lac operon, the galactoside acetyltransferase (thiogalactoside transacetylase, LacA, GAT) encoded by lacA is the only protein whose biological role remains in doubt. Here, we briefly note the classical literature that led to the identification and initial characterization of GAT, and focus on more recent results which have revealed it...
متن کاملExpression of the leucine operon.
Burns, R. O. (Cold Spring Harbor Laboratories of Quantitative Biology, Cold Spring Harbor, N.Y.), J. Calvo, P. Margolin, and H. E. Umbarger. Expression of the leucine operon. J. Bacteriol. 91:1570-1576. 1966.-The four genes which specify the structure of the three enzymes specifically involved in the biosynthesis of leucine in Salmonella typhimurium constitute a single operon. Three types of co...
متن کاملAround and around: The expectations hypothesis
We show how to construct arbitrage-free models of the term structure of interest rates in which various expectations hypotheses can hold. McCulloch (1993) provided a Gaussian non-Markovian example of the unbiased expectations hypothesis (U{EH), thereby contradicting the assertion by Cox, Ingersoll, and Ross (CIR, 1981) that only the so-called local expectations hypothesis could hold. We general...
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ژورنال
عنوان ژورنال: Nature New Biology
سال: 1971
ISSN: 0090-0028,2058-1092
DOI: 10.1038/newbio229031a0