(1) If anionic production of quantum bumps in Limulus photoreceptors is mediated by changes in cyclic nucleotides, then the electrophysiological response of Limulus photoreceptors to tungstate may indicate a role for phosphodiesterase rather than adenylate cyclase in mediating light-induced cyclic nucleotide alterations in this cell.
(2) Film changer angiograms using conventional calcium-tungstate screen combinations.
(3) However, the tungstate effect was not very strong, and the P-2 type tended to change into the P-3.
(4) After staining with hematoxylin-phosphorus-tungstate, the vitelline epithelium of untreated and progesterone-treated rats showed a blue granulation.
(5) The addition of 1 mM tungstate to molybdate-containing media resulted in nearly complete loss of enzyme activity and decreased the intracellular concentration of molybdenum 10-fold.
(6) These studies show that the nontransformed, and the heat-, salt-, and ATP-transformed GRc from the rat liver cytosol can be separated chromatographically, and that the use of tungstate facilitates the resolution of these different receptor forms.
(7) The inactive enzyme obtained from cells grown in the presence of tungstate did not hold Mo but contained 1 mol of W. The content of Fe was not increased.
(8) The constitutive xanthine dehydrogenase and the inducible 2-furoyl-coenzyme A (CoA) dehydrogenase could be labeled with [185W]tungstate.
(9) The level of formate dehydrogenase of C. acidiurici increased 12-fold when 10(-7) M tungstate and selenite were present during growth.
(10) We evaluated six deproteinizing methods for determination of uric acid in serum by "high-performance" liquid chromatography with ultraviolet detection: those involving zinc hydroxide, sodium tungstate, trichloroacetic acid, perchloric acid, acetonitrile, and centrifugal ultrafiltration (with Amicon MPS-1 devices).
(11) Both xanthine dehydrogenase and formate dehydrogenase exhibited the highest level of activity if selenite and tungstate were present in that medium.
(12) Rare earth and barium fluorochloride screen-film combinations of different relative speeds were compared to conventional calcium tungstate systems in patients undergoing excretory urography under controlled conditions.
(13) Single molecules were contrasted with 2 percent potassium silico tungstate which gave better contrast and preservation of enzyme activity than ammonium molybdate.
(14) On the other hand, agents related to VRC and oxoanions of transient metals, such as ribonucleoside, vanadate, molybdate, tungstate and arsenate, exerted no effect on the DNA-cellulose binding ability of the receptor.
(15) Tungstate prevents the formation of NADH-nitrate reductase and FMNH(2)-nitrate reductase activities, but it causes superinduction of NADH-cytochrome c reductase activity.
(16) The results support the idea that NADH-nitrate reductase, FMNH(2)-nitrate reductase and NADH-cytochrome c reductase are activities of the same enzyme complex, and that in the presence of tungstate the 8S enzyme complex is formed but is functional only with respect to NADH-cytochrome c reductase activity.
(17) Rare earth and other new screens absorb a maximum of 1.5 times as much energy and emit twice as much light as comparable calcium tungstate screens.
(18) Furthermore, in vitro cytotoxicity experiments showed inhibition by tungstate of cartilage production in limb bud mesenchymal cultures at concentrations similar to those found in vivo.
(19) We evaluated the physical characteristics and contrast-dose-detail performance of 11 rare-earth and three calcium tungstate screen-film systems.
(20) The transformed and nontransformed GRc were also differentially fractionated by (NH4)2SO4: tungstate-treated (nontransformed) receptor required higher salt concentration and was precipitated at 55% saturation.
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).