(n.) Any one of series of compounds, hydrosulphides of alcohol radicals, in composition resembling the alcohols, but containing sulphur in place of oxygen, and hence called also the sulphur alcohols. In general, they are colorless liquids having a strong, repulsive, garlic odor. The name is specifically applied to ethyl mercaptan, C2H5SH. So called from its avidity for mercury, and other metals.
Example Sentences:
(1) Sodium dodecyl sulfate-polyacrylamide gel analyses of these cross-linked nuclear receptor complexes labeled with the covalently attaching ligand [3H]tamoxifen aziridine reveal a species of about 130,000 mol wt, while the noncross-linked or the cross-linked but mercaptan-cleaved receptor is 65,000 mol wt.
(2) Linear distortion of the mercaptan (polysulfide) rubber base that takes place during setting is a cause of this problem.
(3) Three dialysis membranes, including a polyacrilonitrile membrane, a polycarbonate membrane and a cuprophan membrane coated with charcoal, have been compared with cuprophan in order to assess their ability to clear from aqueous solution and plasma, substances thought to be of pathogenetic importance in hepatic coma (ammonia, short chain fatty acids and mercaptans), some protein bound (glycocholate and bromsulphthalein) and some middle molecular weight molecules (ethylenediaminetetracetic acid, cyanocobalamin and inulin).
(4) A single and chronic inhalation exposure to a complex of chemical substances being part of hydrogen sulphide-containing natural gas (hydrogen sulphide, hydrocarbon, mercaptan, sulphur dioxide) results in a decline in humoral indicators of non-specific body resistance.
(5) A series of alkylthiocolchcines (methyl, ethyl, n-butyl, n-hexy, n-octyl, and pinanyl) was prepared from colchicine by treatment with the appropriate alkyl mercaptan and p-toluenesulfonic acid.
(6) Varieties of thioalkyl-containing quinone and hydroquinone analogues of quinocarcin (1a) were prepared effectively, by addition of mercaptan to 3a-c, which were derived from 1a via DX-52-1 (1b).
(7) Nine of these compounds, hydrogen sulfide, methyl mercaptan, dimethyl sulfide, dimethyl disulfide, methyl acetate, ethyl acetate, heptadiene, methanol, and ethanol, were found on chicken spoiled at both 2 and 10 degrees C. xylene, benzaldehyde, and 2,3-dithiahexane were detected only in samples stored at 2 degrees C and methyl thiolacetate, 2-butanone, and ethyl propionate were associated with 10 degrees C spoilage.
(8) Silicone and polyether materials exhibited perceptibly less permanent deformation than mercaptan materials ten minutes after mixing.
(9) Nucleophilic opening of the chiral epoxide with dodecyl mercaptan gave optically active 1-S-dodecyl-3-O-trityl-1-thio-glycerol, which was used to synthesize 1-S-dodecyl-2-O-decanoyl-thio-sn-glycero-3-phosphocholine.
(10) To induce increased tissue levels of ammonia, mercaptans and fatty acids which are found in HE due to FHF, carefully predetermined doses of urease, dimethyldisulphide and octanoic acid were administered.
(11) The structures of mercaptan and sodium borohydride reaction products of neocarzinostatin chromophore A (NCS Chrom A) are compared.
(12) Metabolic ethyl mercaptan is sufficiently bound to be undetectable by the methods used without hydrolysis.
(13) This system has been shown to be capable of catalyzing the desired reactions with endogenous toxins such as phenols and mercaptans in vitro, and phenols in rabbits in vivo.
(14) P-site cross-linking was more sensitive to mercaptan quenching (50% at 0.5 mM) than was that at the A site (50% at greater than 2.0 mM) but both were partially shielded from solvent.
(15) The drug, only under acidic conditions, reacted with a stoichiometric amount of ethyl mercaptan (or beta-mercaptoethanol) to produce regio-isomers of N-sulfenylated omeprazole sulfide (5-methoxy-2[[(4-methoxy-3,5- dimethyl-2-pyridinyl)methyl]thio]-1- or 3-(ethylthio)benzimidazole).
(16) from L-methionine, the production of large amounts of both dimethyl disulfide and methyl mercaptan was found to be a characteristic of the genus.
(17) The hemolytic action of commercially available nonionic surfactants and synthesized polyoxyethylene fatty acids and mercaptans on human erythrocytes was measured.
(18) Running of gas-cylinder buses (GCB) fueled with liquefied propane-butane mixture added with ethyl mercaptan odorant leads to undesirable medical and social consequences.
(19) 2-hydroxyethyl-mercaptan an ingredient used in mammalian cell culture, inhibited antibody production in trout cells.
(20) 2-Cyano-6-alkylthio- and 6-phenylthiopyrazines were prepared from 2-cyano-6-chloropyrazine (CCP) in the reaction with mercaptans.
Mercury
Definition:
(n.) A Latin god of commerce and gain; -- treated by the poets as identical with the Greek Hermes, messenger of the gods, conductor of souls to the lower world, and god of eloquence.
(n.) A metallic element mostly obtained by reduction from cinnabar, one of its ores. It is a heavy, opaque, glistening liquid (commonly called quicksilver), and is used in barometers, thermometers, ect. Specific gravity 13.6. Symbol Hg (Hydrargyrum). Atomic weight 199.8. Mercury has a molecule which consists of only one atom. It was named by the alchemists after the god Mercury, and designated by his symbol, /.
(n.) One of the planets of the solar system, being the one nearest the sun, from which its mean distance is about 36,000,000 miles. Its period is 88 days, and its diameter 3,000 miles.
(n.) A carrier of tidings; a newsboy; a messenger; hence, also, a newspaper.
(n.) Sprightly or mercurial quality; spirit; mutability; fickleness.
(n.) A plant (Mercurialis annua), of the Spurge family, the leaves of which are sometimes used for spinach, in Europe.
(v. t.) To wash with a preparation of mercury.
Example Sentences:
(1) There is a considerably larger variability of the mercury levels in urine than in blood.
(2) Mercury compounds and EDTA were found to be potent inhibitors of proteinase yscJ activity.
(3) The effects of postnatal methyl mercury exposure on the ontogeny of renal and hepatic responsiveness to trophic stimuli were examined.
(4) The fact that it is still used is regrettable yet unavoidable at present, but the average quantity is three times less than the mercury released into the atmosphere by burning the extra coal need to power equivalent incandescent bulbs.
(5) As yet the observations demonstrate that workers exposed in their occupation to heavy metals (cadmium, lead, metalic mercury) and organic solvents should be subjected to special control for detection of renal changes.
(6) Concern about the safety of the patient and dental personnel does exist, however, due to the possibilities of mercury poisoning.
(7) In order to determine the specific action of cadmium on bone metabolism, the effect of cadmium on alkaline phosphatase activity, a marker enzyme of osteoblasts, was compared with that of other divalent heavy metal ions, i.e., zinc, manganese, lead, copper, nickel and mercury (10 microM each), using cloned osteoblast-like cells, MC3T3-E1.
(8) Inorganic mercury as HgSO4 or HgCl2, at dietary levels up to 200 p.p.m.
(9) An analysis of the clinical markers indicated no clear relationship between elevated urinary mercury concentrations and kidney dysfunction.
(10) In vivo the administration of captopril prevented the toxic effects of mercury poisoning on membrane permeability, oxidative phosphorylation and Ca++ homeostasis.
(11) Histological changes were similar in inorganic and methyl mercury treated fish except the higher intensity observed in the latter treatment.
(12) Unlike other eukaryotic enzymes, the plant enzyme showed no activation with organic mercurials and was inhibited by urea and KCl.
(13) Postoperative APR improved to 86.3 millimeters of mercury and ABI to 0.63 (p less than 0.05).
(14) Attempts to induce mercury resistance in the aerobic isolates were successful, but no induction was seen in the anaerobes.
(15) High concentrations of mercury, cadmium, and lead have also been observed in urban soils.
(16) In the presence of peripheral vasodilatation, adequate blood flow can be expected after such bypass grafts at blood pressures as low as 80 millimeters of mercury and hypotension per se does not produce vascular steal.
(17) A transistor radio activated by a mercury switch was used to reinforce head posture in two retarded children with severe cerebral palsy.
(18) This species, therefore, seems to be about twice as sensitive to the neurotoxic properties of methyl mercury salts as the laboratory rat.
(19) Under this condition, MeHg- and Hg(++)-induced increases in fluorescence were associated with depolarization of psi p. A second approach was used to assess changes in psi p. In synaptosomes, the magnitude of the increase in fluorescence resulting from depolarization of psi p with a stimulus of constant intensity is a function of the resting psi p. The fluorescence response to depolarization of synaptosomes previously exposed to either MeHg or Hg++ (1-20 microM each) was reduced in a concentration-dependent manner relative to mercury-free controls.
(20) Of the tubular cell ultrastructures, the lysosome was the most sensitive to mercury, and there was a close relation between the excretion of urinary mercury and the mercury detoxication mechanism of the kidney.