Define catabolic steroids

The role of quadriceps strengthening exercises on already involved knees was further investigated by Sharma, L et al.[22] Adults with primary knee osteoarthritis were studied prospectively for eighteen months. Baseline quadriceps strength was measured and greater strength was associated with greater risk for progressive tibiofemoral joint space narrowing among adults with malaligned or very lax knees. Although these results do not imply that physical activity in adults with knee osteoarthritis is harmful it does call into question whether maximum quadriceps exercise in patients with malaligned and/or lax knees is protective or actually harmful.

An E. coli cell growing on a carbon source such as glucose or glycerol contains fewer than 10 molecules of β -galactosidase. In contrast, the same cell contains several thousand molecules of the enzyme when grown on lactose. The presence of lactose in the culture medium induces a large increase in the amount of β -galactosidase by eliciting the synthesis of new enzyme molecules rather than by activating a preexisting but inactive precursor. A crucial clue to the mechanism of gene regulation is that two other proteins are synthesized in concert with β -galactosidase namely, galactoside permease and thiogalactoside transacetylase . The permease is required for the transport of lactose across the bacterial cell membrane. The transacetylase is not essential for lactose metabolism but appears to play a role in the detoxification of compounds that also may be transported by the permease. Thus, the expression levels of a set of enzymes that all contribute to the adaptation to a given change in the environment change together . Such a coordinated unit of gene expression is called an operon .

Define catabolic steroids

define catabolic steroids


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