anhydrase (medicine) and radioactive (iou)

anhydrase (medicine)

anhydrase
<enzyme> An enzyme that catalyses the removal of water from a compound; most such enzymes are now known as hydrases, hydro-lyases, or dehydratases.

Carbonic anhydrase, a zinc-containing enzyme that catalyses the interconversion of CO2 with HCO3- and H+. There are at least seven human isozymes that appear predominantly in red blood cells, secretory tissues, muscle, etc. A deficiency of carbonic anhydrase II can result in osteopetrosis and metabolic acidosis. The inhibition of carbonic anhydrase IV and possibly carbonic anhydrase II by sulfonamides is a current therapy in the treatment of glaucoma.

Synonym: carbonate dehydratase, carbonate hydro-lyase.

radioactive (iou)

radioactive adjective. L19.
[from Radio- 4 + ACTIVE.]
Of an atomic nucleus, a substance, etc.: (capable of) undergoing spontaneous nuclear decay involving emission of ionizing radiation in the form of particles or gamma rays. L19.
Of a process, phenomenon, etc.: of, pertaining to, involving, or produced by radioactivity. E20.
M. Marrin Measure the age of the substance..from its radioactive decay.
Special collocations: radioactive equilibrium a condition in which the quantities of radioactive daughter nuclides in a material remain constant because each is formed as fast as it decays. radioactive series a series of radioactive nuclides each member of which decays into the next, together with a non-radioactive end-product; the series of transformations relating such a set of nuclides. radioactive waste waste material that is radioactive, esp. spent nuclear fuel.
radioactively adverb by radioactive decay; with radioactive material; by means of a technique dependent on radioactivity: E20.

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