(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.
Tungstic
Definition:
(a.) Of or pertaining to tungsten; derived from, or resembling, tungsten; wolframic; as, tungstic oxide.
Example Sentences:
(1) After aldehyde-tannic fixation, Zinc-iodine-osmium fixation, Phospho Tungstic acid-chromium stain and two cytochemical reactions, the ultrastructure of the Golgi complex of early spermatids in the guinea pig reveals two different regions.
(2) Total preparations of P. aeruginosa (strain 65) were studied after contrastive treatment with 2% phosphato-tungstic acid and 2% uranyl acetate; ultrathin sections of bacteria treated with chlorhexidine bigluconate in various concentrations and fixied by the method of Hoffmann et al.
(3) Comparison of dye-bound-protein values with those for tungstic-acid-precipitated nitrogen x 6.25 for the LPC samples showed the heat-damaged samples to lie below the regression line for the other samples.
(4) Tungstic acid gel was applied to the motor area of the left side of the cortex, and the following results were obtained.
(5) Effects of anticonvulsants were electroencephalographically (EEG) and behaviorally examined on experimental epilepsy induced by cortical application of tungstic acid gel in rats.
(6) Pyramidal tract neurons (PTNs) from tungstic acid, cobalt and alumina gel foci in cat were studied for spontaneous and antidromically-evoked firing patterns.
(7) The wide spectrum of protein derivatives crossing the gut wall have been utilised to compare the relative effectiveness of 10% TCA, and 1% tungstic acid, as reagents for the quantitative assessment of radioactive proteins and peptides.
(8) Effects of zonisamide (AD-810, CI-912) were examined on tungstic acid gel-induced thalamic generalized seizures and conjugated estrogen-induced cortical spike-wave discharges in gallamine-immobilized cats.
(9) The procedure involves tungstic acid extraction, partitioning into ethyl acetate, evaporation of ethyl acetate, derivatization with pentafluorobenzyl bromide (PFB), and analysis of the resulting derivative (PFB-FAC) by capillary gas chromatography-mass spectrometry (CGC-MS) with specific ion monitoring (SIM).
(10) 1966.-Purified Vi antigen (Vi) mixed in equal amounts with bovine serum albumin (BSA) or human gamma globulin (HGG) at pH values above 4.7 formed a complex which was not precipitated by trichloroacetic acid or tungstic acid.
(11) The procedure requires about three minutes to perform and utilize a tungstic acid precipitant solution and urine glucose dipsticks.
(12) Values for protein by dye-binding correlated well with those for tungstic-acid-precipitated nitrogen (x6.25).
(13) Using rapid ionic fixation with molybdic or tungstic heteropolyanions (strong precipitating agents of quaternary ammonium cations such as choline and acetylcholine), acetylcholine-like cations were localized as point-like precipitates in the synaptic vesicles of resting (electrically nonstimulated) motor nerve terminals.
(14) Within the pH range 2.5-6.5 tungstic acid (an isopolyacid) prevents the reduction of silver ions by ascorbic or hydroquinone more effectively than either gum acacia or other protective colloids.
(15) Zonisamide prolonged the interictal periods of the generalized seizures by thalamic (centralis lateralis) application of tungstic acid gel (50 microliters) and, at the higher doses, abolished the seizures; its potency was near that of phenobarbital.
(16) The colloid state of tungstic acid can be stabilized with nonionic detergents, especially with Triton X-100.
(17) Trichloroacetic acid and tungstic acid are found to interfere in the assay.
(18) We have experienced a colorimetric procedure in which the sulfhydryl group of cystine reduces phosphotungstic acid to tungstic blue, which is determined photometrically.
(19) The LFI burst did occur spontaneously from PTNs in tungstic acid foci but could not be antidromically evoked.
(20) The method is based on a rapid precipitation of quarternary ammonium cations (such as acetylcholine or choline) by molybdic or tungstic heteropolyanions (such as phosphomolybdic acid, phosphotungstic acid and silicotungstic acid).