(n.) A rare element of the chromium group found in certain minerals, as wolfram and scheelite, and isolated as a heavy steel-gray metal which is very hard and infusible. It has both acid and basic properties. When alloyed in small quantities with steel, it greatly increases its hardness. Symbol W (Wolframium). Atomic weight, 183.6. Specific gravity, 18.
(n.) Scheelite, or calcium tungstate.
Example Sentences:
(1) Moments later, explosive charges blasted free two tungsten blocks, to shift the balance of the probe so it could fly itself to a prearranged landing spot .
(2) This in vivo incorporation of tungsten was competitively hindered by molybdenum.
(3) The results of transmission measurements for neutrons, cobalt-60 gamma-rays, and 10 and 15 MV photons made with close-packed arrays of tungsten rods are presented.
(4) Using a tungsten microelectrode, activities of medullary inspiratory neurons were recorded around nucleus ambiguus.
(5) Treatment was administered with white light produced by a commercially available halogen-tungsten lamp.
(6) The results support the hypothesis that mild steel welding and to a lesser extent stainless steel welding with tungsten inert gas is associated with reduced semen quality at exposure in the range of the Danish process specific threshold limit values of welding.
(7) All xeroradiographic measurements were made with a tungsten target source with aluminum filtration at half-value layers of 1.5 to 1.56 mm Al.
(8) The electrode consists of a 30 gauge stainless steel cannula through which multiple strands of 13 micron insulated tungsten microwires are threaded.
(9) Under these conditions, blue absorbing intermediate(s) is (are) formed, the time constant of regeneration of rhodopsin is much faster than after long tungsten bleaches, and the kinetic equation is not valid.9.
(10) Dense projections of the presynaptic grid are most sensitive to hypoxia: their height, distinctness of the frame, and the intensity degree of phosphoric tungsten acid staining decrease.
(11) For larger angles some discrepancies appear which could be either due to increased filtration by tungsten (surface roughness) or limited applicability of the data used.
(12) The uptake of cobalt by macrophages in the presence of tungsten carbide was found to be increased.
(13) A previous study from this laboratory, using morphological and biochemical (LDH release) parameters, has shown that tungsten carbide-cobalt dust exhibits a greater cytotoxicity toward isolated macrophages than cobalt metal powder alone.
(14) After a recovery period of approximately one month, physiological recordings were made with tungsten micro-electrodes from the central nucleus of the inferior colliculus of animals with SOC lesions.
(15) A high prevalence of gout among workers of the mining industry and early age at the onset of disease suggest probable association of gout with some industrial factors (manganese, tungsten, molybdenum, bismuth).
(16) Biological systems show a marked preference for molybdenum over tungsten.
(17) To determine the physiological role of xanthine oxidase in renal ischemia, we depleted rats of xanthine oxidase by feeding tungsten.
(18) A cross-sectional study of 1,039 tungsten carbide (TC) production workers was carried out.
(19) Intercellular interconnections in neuropil of dorsal ganglia in the subpharyngeal complex and nerves have been studied in a mature snail (Helix pomatia), dimensions of the shell--3.0 X 3.5 sm, after double fixation (glutaraldehyde and osmium tetraoxide) and treatment with phosphoric tungsten acid.
(20) Images of DNA and ribosomal subunits contrasted by sputter shadowing with tungsten are shown.
Tungstite
Definition:
(n.) The oxide of tungsten, a yellow mineral occurring in a pulverulent form. It is often associated with wolfram.