| molybdenum | <chemistry> A rare element of the chromium group, occurring in nature in the minerals molybdenite and wulfenite, and when reduced obtained as a hard, silver-white, difficulty fusible metal. Symbol Mo. Atomic weight 95.9. Origin: NL., cf. F. Molybdene. See Molybdena. Source: Websters Dictionary (01 Mar 1998) |
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| molybdenum breakthrough | <radiology> 0.15 uCi Mo-99 / mCi Tc-99m, must check EVERY elution of generator, use dose calibrator and lead shield, Mo-99 emits beta particles, has 67-hr half-life, it's taken up by liver (12 Dec 1998) |
| molybdenum cofactor | A complex of molybdenum and molybdopterin required for a number of enzymes. A deficiency of this cofactor will result in lower activities of sulfite oxidase, xanthine dehydrogenase, and aldehyde oxidase causing elevated levels of sulfite, thiosulfite, xanthine, etc. (05 Mar 2000) |
| molybdenum target tube | An X-ray tube with an anode surface made of molybdenum instead of tungsten, used in mammography. (05 Mar 2000) |
| molybdenum-99 | A reactor-produced radioisotope of molybdenum with a half-life of 2.7476 days, used in radionuclide generators for the production of technetium-99m. (05 Mar 2000) |
| molybdenum-iron protein aldehyde oxidoreductase | <enzyme> Related to xanthine oxidase; isolated from desulfovibrio gigas Registry number: EC 1.2.7.- Synonym: mop protein (26 Jun 1999) |