(n.) A gaseous compound of hydrogen and nitrogen, NH3, with a pungent smell and taste: -- often called volatile alkali, and spirits of hartshorn.
Example Sentences:
(1) This method provided myocardial perfusion images of high quality which were well correlated with N-13 ammonia images.
(2) Studies were performed to characterize the determinants of proximal tubule ammonia entry (and retention) in vivo.
(3) Confirmation of the striking correlation between increased urinary ammonia and lowered neonatal ponderal index may afford a simple test for the identification of nutrient-related growth retardation.
(4) However, almost all of the numerous compounds found to inhibit ammonia oxidizers also inhibit methanotrophs, and most of the inhibitors act upon the monooxygenases.
(5) An otherwise progressive rise in blood ammonia concentration was halted in the treatment group.
(6) The high rate of H pylori ammonia production in uraemic patients should accentuate any ammonia induced effects.
(7) The determination of ammonia in plasma, using glutamate dehydrogenase, is complicated by non-specific oxidation of the coenzyme, promoted by components of the sample matrix.
(8) The methanol-ammonia (20:1) and chloroform-methanol-ammonia (2:2:1) systems, used with silica-gel plates, are the most promising for rapid preliminary screening of tuna fish extracts for histamine.
(9) The effect of ammonia is partially reversed by nitrate.
(10) The addition of glutamine or ammonia increased glycine incorporation of control cultures, but failed to do so in treated cultures.
(11) Plasma dextrose and bicarbonate declined in concentration while potassium, lactate, LDH, ammonia, and hemoglobin rose with storage.
(12) The changes were proportional to the concentration and duration of ammonia treatment.
(13) The Km for ammonia of carbamyl phosphate synthetase was determined by preincubating isolated liver cells for 30 min in the absence of ammonia and bicarbonate and in the presence of ornithine, chloroquine, which blocks lysosomal proteolysis, and aminoxy acetic acid, which inhibits transaminases.
(14) The highest predictive values for the exclusion of TiC are shown by inconspicuous concentration capacity accompanied by normal ammonia excretion, total acid excretion, water diuresis, free water clearance or urine dilution capacity.
(15) All dogs were evaluated at the beginning of the study by complete physical examination; total and differential WBC counts; serum biochemical analysis (alanine transaminase and alkaline phosphatase activities and bilirubin and albumin concentrations); sulfobromophthalein excretion, ammonia tolerance, and glucagon response testing; portal and intraparenchymal pressure determinations; operative mesenteric portography; and histologic assessment of hepatic biopsy specimens.
(16) The significant differences (p=0.001) are found by lysine, ammonia, histidine, arginine, threonine, glutaminic acid, and phenyl alanine.
(17) Formation of anthranilate will proceed in the presence of partially pure subunit I provided ammonia is available in place of glutamine.
(18) Net synthesis of microbial N (Nn) was calculated from ammonia-N incorporation.
(19) Attachment of sufficient quantities of PEG to phenylalanine ammonia-lyase substantially reduces immunological recognition and clearance of the conjugated enzyme in mice.
(20) No direct relationship exists between glutamate dehydrogenase (NADP+) and glutamate-ammonia ligase in P. denitrificans, while the glutamate synthase (NADPH) activity changes in parallel with that of the latter enzyme.
Hydroxylamine
Definition:
(n.) A nitrogenous, organic base, NH2.OH, resembling ammonia, and produced by a modified reduction of nitric acid. It is usually obtained as a volatile, unstable solution in water. It acts as a strong reducing agent.
Example Sentences:
(1) The 1-0-methylalduronic-acidmethylesters, obtained by the methanolysis of the polysaccharides, are reduced with boronhydrid to the corresponding methyl glycosides; there are split with acid to the aldoses, which are converted in pyridine with hydroxylamine to the aldoximes and than with acetic anhydride to the aldonitrilacetates, which can be separated by gaschromatography without difficulty.
(2) Both diaminobutyric and diaminopropionic acids were seen in the acid hydrolyzate of the protein treated with hydroxylamine and subjected to rearrangement in the presence of carbodiimide.
(3) Most of the somatogenic binding activity was recovered by hydroxylamine treatment, which removes O-acetyl groups from tyrosine residues but not N-acetyl groups from lysine residues.
(4) The chemistry involved reaction rate constant measurements of MSF hydrolysis and for reactions with phenolic, amine, oxime, hydroxamic acid, phenyl N-hydroxycarbamate, and hydroxylamine compounds and cupric imidazole and bipyridyl complexes.
(5) The data analyses indicate that the hydroxylamine method is a suitable substitute for the microbiological method for potency assays and stability studies of ampicillin formulations.
(6) Metabolites identified include products from side-chain C-hydroxylation (benzyl alcohols and benzaldehydes) and N-hydroxylation (hydroxylamines and nitroso derivatives).
(7) The syntheses of the secondary hydroxylamines of nor1chlorpromazine and nor1promazine via their corresponding primary hydroxylamines and oximes are described.
(8) The microsomal oxidation of 2-aminobenzyl alcohol also resulted in the formation of two reducing agents, one of which was the corresponding hydroxylamine.
(9) Hydroxylamine mutagenesis was used to alter the tar gene that encodes the transmembrane Tar protein required for chemotaxis.
(10) The enzyme displayed a very broad substrate specificity, reducing various N-oxide and sulfoxide compounds as well as chlorate and hydroxylamine.
(11) Antisera to NADPH-cytochrome c reductase markedly decreased hydroxylamine accumulation during incubation but had no effect on the rate of 2-naphthylamine N-oxidation.
(12) The single oxidation of the oxygen binding site can be reversed by reduction with hydroxylamine, and the oxygen binding properties of the protein are simultaneously restored.
(13) After inactivation by 1-D-1,2-anhydro-myo-inositol the label was released by hydroxylamine and identified as scyllo-inositol.
(14) Enzyme inactivated with diethyl pyrocarbonate was re-activated by hydroxylamine.
(15) Hydroxylamine (1 mM) and ethanolamine-O-sulfate (10 mM), well-known inhibitors of cerebral GABA formation and GABA catabolism respectively, inhibited renal tubular GABA formation at 100% and 44% respectively.
(16) The mesophyll material could be made to resemble the bundle-sheath chloroplasts in respect of both phenomena by adding to it 1-(3',4'-dichlorophenyl)-3,3-dimethyl-urea and hydroxylamine, together.
(17) Hydroxylamine removes (reduces) oxidizing equivalents, generated in the water-splitting system by flash excitation.
(18) A nucleotide-peptide linkage involving a phosphoamide bond is unlikely since the complex is resistant to 3.5 M hydroxylamine at pH 4.75.
(19) By hydroxylamine mutagenesis, we have identified a rad1 mutant allele whose encoded protein fails to complex with RAD10.
(20) Among the compounds studied 4 hydroxylamine derivatives were observed to have a mutagenic effect.