(n.) A mineral occurring in soft, lead-gray, foliated masses or scales, resembling graphite; sulphide of molybdenum.
Example Sentences:
(1) Exposure to molybdenum in dust was measured in a molybdenite roasting plant.
(2) Under prebiotic conditions such complexes could have been formed similarly from molybdenite and may have been precursors of molybdoenzymes.
(3) The differences followed the Main Karakoram Thrust, suggesting a geological goitrogen in the north, which might be minerals containing ions such as BF4- and SO3F-, and molybdenite and calcium, which are present in rocks in Baltistan.
Molybdenum
Definition:
(n.) 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.
Example Sentences:
(1) A knee simulator was used to study the wear of carbon fiber reinforced UHMWPE (Poly Two) (Poly Two is a registered trademark of Zimmer, USA) tibial and patellar components against Ti-6A1-4V, titanium nitride (TiN)-coated Ti-6A1-4V, and cobalt-chromium-molybdenum femoral components.
(2) This in vivo incorporation of tungsten was competitively hindered by molybdenum.
(3) Cystine increased the molybdenum requirement of Mol- mutants for nitrate reductase activity by at least 100-fold.
(4) Analysis of data on the influence of different metals (cadmium, cobalt, molybdenum) on the Drosophila melanogaster cells has revealed a considerable genotoxic effect of cadmium salts which manifests in the high percentage of cells elimination at the early stages of spermatogenesis--the premeiotic cells.
(5) The influence of the electric field of commerical frequency on metabolism and interorgan distribution of copper, molybdenum, iron and manganese was studied in the 4-month experiment on animals with their daily 30-minute exposition.
(6) Prevention of Enzootic Icterus by salts of molybdenum given orally confirms the identity.
(7) The molybdenum cofactor in a number of E. coli enzymes has been shown to contain GMP in addition to the metal-molybdopterin complex, with the GMP appended in pyrophosphate linkage to the terminal phosphate ester on the molybdopterin side chain.
(8) The accumulation of 99Mo (from 99MoO4(2-) into molybdenum-containing species in Clostridium pasteurianum was investigated to identify the molybdoprotein(s) involved in Mo metabolism.
(9) measurements at 35GHz near to 4.2K showed that the interaction has the same sign at all molybdenum orientations and is ferromagnetic.
(10) Molybdenum of both signal-giving species may be reduced with dithionite and reoxidized with nitrate.
(11) Gilded molybdenum-wire remains in the sclera and episclera without any reaction of the tissue.
(12) It is a molybdenum hydroxylase containing 1.6 mol of FAD, 7.3 mol of Fe, 8.3 mol of acid-labile sulphide and 1.3 mol of Mo per mol of enzyme.
(13) These complexes, as well as the low-pH form of the free enzyme, showed interaction of molybdenum with a single exchangeable proton.
(14) The influence of dietary molybdenum on esophageal carcinogenesis induced by N-methyl-N-benzylnitrosamine (2.5 mg per kg of body weight once a week for 20 wk s.c.) was studied in male F344 rats.
(15) Possible mammographic advantages of "trans-molybdenum" anodes (atomic number greater than ZMo) are decreased dose because the fluorescent radiation is more penetrating, and increased useful output; contrast degradation is known to be tolerable.
(16) This paper is a study of the effects of molybdenum on the experimental fluorine poisoning in rats and on sodium molybdate treatment of the F-stain teeth in children.
(17) The role of the molybdenum-containing enzymes aldehyde oxidase and xanthine oxidase in the generation of such free radicals was investigated by measuring alkane production (lipoperoxidation products) in isolated rat hepatocytes during ethanol metabolism.
(18) Moreover, high levels of molybdenum were found in isolated peroxisomal cores by atomic absorption spectroscopy, thus corroborating the association of the molybdenum-containing enzyme with the cores.
(19) The anaerobic enhancement of chlA expression is mediated via a mechanism that is distinct from the molybdenum cofactor effect.
(20) Following thiomolybdate administration, the concentration of copper in the liver was reduced, that of molybdenum increased and the concentration of copper and molybdenum in the kidney increased.