X
symbol, Kienböck’s unit (of x-ray exposure).
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X disease
see chlorinated naphthalenes.
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X factor
see hemin.
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x radiation
see radiation, x-ray.
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xanth(o)-
word element. [Gr.] yellow.
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xanthemia
the presence of yellow coloring matter in the blood; carotenemia.
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xanthic
1. yellow. 2. pertaining to xanthine.
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xanthine
a purine compound found in most bodily tissues and fluids; it is a precursor of uric acid. Xanthine compounds such as theophylline have diuretic properties.
x. calculi see xanthine urolith.
dimethyl x. theobromine.
x. oxidase key enzyme in the pathway for purine breakdown. Catalyzes the conversion of hypoxanthine to xanthine and then to uric acid. Generates hydrogen peroxide, whi... |
xanthinuria
excess of xanthine in the urine.
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Xanthium
plant genus in the family Asteraceae; the seeds contain a potent toxin, carboxyatractyloside, which causes acute hepatic necrosis. Poisoning results from eating the seeds, or the cotyledons of the young seedlings that grow in profusion after rain falls. Includes X. ambrosioides, X. californicum, X. cavanillesii (South American cockleburr), X. chinense, X. italicum (Italian cockleburr), X. oriental... |