| catabiotic | Used up in the carrying on of the vital processes other than growth, or in the performance of function, referring to the energy derived from food. Origin: cata-+ G. Biotikos, relating to life (05 Mar 2000) |
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| catabolic | <biochemistry> Of or pertaining to catabolism; as, catabolic processes, which give rise to substances (catastates) of decreasing complexity and increasing stability. (16 Mar 1998) |
| catabolic pathway | <biochemistry> A series of reactions in a metabolic pathway that break down complex compounds into simpler ones, usually releasing energy in the process. Compare: anabolic pathway. (16 Mar 1998) |
| catabolin | <protein> Protein, later shown to be interleukin-1 IL-1, that stimulates the breakdown of connective tissue extracellular matrix. (18 Nov 1997) |
| catabolism | <biochemistry> Any destructive metabolic process by which organisms convert substances into excreted compounds. Origin: Gr. Katabol = a throwing down (18 Nov 1997) |
| catabolite | <biochemistry> Product of catabolism, the breakdown of complex molecules into simpler ones. (16 Mar 1998) |
| catabolite (gene) activator protein | A protein that can be activated by cAMP, whereupon it affects the action of RNA polymerase by binding it with it or near it on the DNA to be transcribed. Synonym: cAMP receptor protein, catabolite gene activator. (05 Mar 2000) |
| catabolite gene activator | catabolite (gene) activator protein |
| catabolite gene activator protein | <molecular biology, protein> A regulatory protein that triggers the transcription of genes that generate the enzymes bacteria need to usenutrients when glucose isabsent. (16 Mar 1998) |
| catabolite repression | <biochemistry, molecular biology> Inducible enzyme systems in some microorganisms (such as the lac operon) that are repressed when a more favoured carbon source, such as glucose, is available. Repression in E. Coli is partially relieved if cAMP is bound to the cAMP catabolite activator protein (cAMP receptor protein, CRP) that binds to DNA upstream of the repressed operon concerned. Catabolite repression (of the respiratory system) is seen in yeast in high glucose concentrations, though the mechanism is different. (16 Mar 1998) |
| catachronobiology | The study of the deleterious effects of time on a living system. Origin: cata-+ G. Chronos, time, + biology (05 Mar 2000) |
| catacrotic | Denoting a pulse tracing in which the downstroke is interrupted by one or more upward waves. (05 Mar 2000) |
| catacrotic pulse | A pulse in which there is an upward notch interrupting the descending limb of the sphygmogram. Synonym: pulsus catacrotus. (05 Mar 2000) |
| catacrotism | A condition of the pulse in which there are one or more secondary expansions of the artery following the main beat, producing secondary upward waves on the downstroke of the pulse tracing. Origin: cata-+ G. Krotos, beat (05 Mar 2000) |
| catadicrotic | Denoting a pulse tracing in which there are two minor elevations interrupting the downstroke. (05 Mar 2000) |