(n.) A compound of arsenic and hydrogen, AsH3, a colorless and exceedingly poisonous gas, having an odor like garlic; arseniureted hydrogen.
Example Sentences:
(1) Higher concentrations of methemoglobin in animals in the 2.500 ppm exposure group (measured after 90 days of exposure) indicated that the rate of oxidation of heme (ferrous to ferric) increased due to exposure to arsine gas.
(2) Arsine and in general airborne arsenic compounds show the main cancer promoting characteristics.
(3) In order to examine possible species differences in response to arsine exposure, multiple inhalation studies consisting of acute (1-day), subacute (14- and 28-day), and subchronic (90-day) exposures to this agent were conducted using three different species of rodents.
(4) Fetuses weighed more than in the control group but other endpoints of developmental toxicity were not affected by arsine exposure.
(5) While the clinical picture suggested arsine or stibine poisoning, preliminary investigation of the plant revealed no obvious source of arsenic, antimony, or hydrogen gas.
(6) Hematocrit values at 24 hr after exposure decreased linearly with increasing arsine concentration in the range 5 to 26 ppmv; the hematocrit of the 26-ppmv group reached 10.5% at 24 hr, compared to 48.4% for control mice.
(7) A 1 g sample is wet washed in a 16 x 150 mm 10 mL volumetric test tube on a programmed heating block with nitric, sulfuric, and perchloric acids at up to 310 degrees C. After treatment with hydrochloric acid and potassium iodide, arsenic is reduced by sodium borohydride to arsine in a simplified continuous flow manifold.
(8) To examine these, we exposed male and female mice to 0.000, 0.025, 0.500 and 2.500 ppm arsine gas for 6 h a day, 5 days a week during a 90-day period.
(9) Concern about semiconductor workers prompted an in-depth study of arsine at the National Institute of Environmental Health Sciences to determine the hematopoietic effects of prolonged exposure to this gas.
(10) Effects on other organs were not observed, suggesting that the hematopoietic system is the primary target for arsine.
(11) At least three times more arsine than dimethylarsine was produced in soil incubated with dimethylarsinate.
(12) The number of live fetuses, mean fetal body weight, and percentages of resorptions or malformations per litter were not affected by arsine exposure.
(13) In most situations where arsine can be formed if antimony is present.
(14) After 5, 15, and 90 days of exposure, blood was collected and routine hematologic profiles were performed to document the effects of arsine gas on peripheral blood.
(15) The National Institute for Occupational Safety and Health (NIOSH) recommends that appropriate workpractices be implemented to reduce the risk of worker exposure to arsine (AsH3) gas.
(16) We drew a conclusion that TM-As is far less an toxic than arsine, most probably due to its in vivo conversion to TMAO.
(17) A series of eight neutral technetium(II)-99m complexes of general formula tr-[99mTcIID2X2]0, where D represents a chelating ditertary phosphine or arsine ligand and X represents a halide or pseudohalide ligand, has been prepared and characterized by HPLC comparisons to the known 99Tc analogs.
(18) This recommendation is based on several reports of worker exposure to arsine resulting in severe toxic effects or death.
(19) Among these arsines, dimethylarsine was mutagenic in WP2 (wild-type; Exc+Rec+) and WP2uvrA (uvrA-; Exc-Rec+), while trimethylarsine was not.
(20) An accuracy investigation, initiated because of conflicting analytical data on the arsenic content for some 24 drinkinig water locations in the Mojave Desert, revealed that interference with the evolution of arsine in the American Public Health Association silver diethyldithiocarbamate method caused either color enhancement or arsine suppression.
Hydride
Definition:
(n.) A compound of the binary type, in which hydrogen is united with some other element.
Example Sentences:
(1) The corresponding hydrides, mono-n-butyltin hydride, di-n-butyltin hydride, tri-n-butyltin hydride, monophenyltin hydride, diphenyltin hydride triphenyltin hydride, are detected by electron-capture gas chromatography after clean-up by silica gel column chromatography.
(2) The latter compounds were reduced with lithium aluminium hydride to the respective amines (II a-c) and then N-alkylated by reaction with 2-propynyl-, 2-butynyl- or 2,3-butadienyl bromides to the corresponding amines (III a-j).
(3) The mechanism of hydrogen activation was shown to be heterolytic cleavage to an enzyme hydride and a proton.
(4) The lithium aluminum hydride reduction product of the 24R-acid (Vb) was identical with the naturally occurring 5 beta-ranol, hence 5 beta-ranol has the 24R configuration.
(5) An evaluation of the possible role of flavins (as a hydride carrier between NADPH and the steroid) has shown that progesterone 5 alpha-reduction is inhibited by high levels of flavins and flavin analogs.
(6) The higher the rate of hydride transfer at pH 7.65, the higher the pH of the cross-over point.
(7) Because we have been unable to detect trans coordination of 2-mercaptoethanol, we favor a mechanism that involves a hydride attack on the Co-methylene carbon of (carboxymethyl)cobalamin rather than a trans attack of the thiol on the cobalt atom.
(8) Only O-benzoylation occurred on reaction with benzoic an hydride.
(9) 40- and 60-S ribosomal subunits and 80-S ribosomes from rat liver were highly labelled by reductive methylation using formaldehyde and sodium boro-[3H] hydride, under conditions which did not decrease their activity in poly-U-directed polyphenylalanine synthesis.
(10) A new rapid high yield synthesis of radiolabeled N'-(4-11C-methyl)imipramine has been developed using a reductive-carboxylation approach, in which 11CO2 is reacted with either N'-trimethylsilyldesimipramine or N'-lithium derivative of desimipramine, followed by lithium aluminum hydride reduction, to give no carrier added or carrier added 11C-labeled imipramine respectively.
(11) Reduction of this mixture 1 with sodium aluminum bis-(methoxyethoxy)hydride furnished the 11 beta, 18, 21-triol 2a.
(12) The two mechanisms have been assessed in terms of the calculated absolute and relative pKas of the protonated species taking into account experimental information regarding possible stabilization of these forms in the enzyme active site and also the effectiveness of the various protonations in assisting the hydride ion transfer step.
(13) A radioactive label was introduced by using sodium boro[3H]hydride to reduce the initially formed Schiff's base.
(14) After deoxygenation of 2'-O-[[(4-methylphenyl)oxy]thiocarbonyl] compounds 20A-E with tributyltin hydride the 2,3'-anhydro bridge of the 2'-deoxynucleosides 21A-E was opened with LiN3 to produce the protected 3'-azido-2,3'-dideoxynucleoside derivatives 22A-G. Saponification with NaOCH3 gave 1-(3'-azido-2',3',5'-trideoxy-beta-D-allofuranosyl)thymine (2; homo-AZT), the 5'-C-(hydroxymethyl) derivatives of AZT 1-(3'-azido-2',3'- dideoxy-beta-D-allofuranosyl)thymine (3) and 1-(3'-azido-2',3'-dideoxy-alpha-L-talofuranosyl)thymine (4), and the 5'-C-methyl derivatives of AZT 1-(3'-azido-2',3',6'-trideoxy-beta-D-allofuranosyl)thymine (5) and 1-(3'-azido-2',3',6'-trideoxy-alpha-L-talofuranosyl)thymine (6).
(15) While further improvements might lead to potential enhancement of sensitivity and precision of as much as an order of magnitude, the present performance of the hydride system was satisfactory in relation to the requirements of isotopic analysis for metabolic investigations employing 74Se as the in vivo stable isotope tracer.
(16) These models, in turn, have suggested detailed mechanisms for the various chemical steps of the reaction: a ring opening catalysed by an activated histidine, a hydride-shift isomerization, and a ring closure which may be facilitated by a polarised water molecule.
(17) The disulfide form but not the sulfhydryl form of a boron hydride compound was found to be cataractogenic.
(18) Proper molecular orientation is required for hydride transfer (Dalziel and Dickinson, 1967).
(19) An alkylation technique using methyl iodide and sodium hydride in dimethyl sulfoxide has been evaluated for 3 carbamate and 7 urea herbicides in 9 foods.
(20) To determine the effectiveness of the selenium reduction and the completeness of the selenium hydride formation a parallel selenium determination was carried out by means of ICP-AES and FI-HAAS analysis.