(n.) A compound radical, NH4, having the chemical relations of a strongly basic element like the alkali metals.
Example Sentences:
(1) Thus, saponin and ammonium chloride can be used to isolate whole infected erythrocytes, depleted of hemoglobin, by selective disruption of uninfected cells.
(2) Both SAA and non-SAA enhanced ammonium excretion but only non-SAA enhanced organic anion excretion, an indicator of incomplete oxidation of organic acids.
(3) Substrate availability or accumulations of lactate and ammonium could have significant roles.
(4) The first step is the preparation of a globulin-enriched fraction by precipitation with ammonium sulfate at 50% saturation, or of an immune-complex-enriched fraction by precipitation with 5% polyethylene glycol 6000.
(5) The enzyme extracted from strains containing the recombinant plasmid was identical to N. crassa catabolic dehydroquinase by the criteria of heat stability, ammonium sulfate fractionation, immunological crossreactivity, molecular weight, and purification characteristics.
(6) Hydropathic analysis of the inferred amino acid sequence of the gene product predicts that amtA encodes a cytoplasmic component of the ammonium transport system.
(7) Ratfish serum proteins have been fractionated by ammonium sulfate, followed by gel filtration on Sepharose 6B.
(8) The relationship between urine pH, modified by the oral administration of either ammonium chloride or sodium bicarbonate, and the urinary excretion of prostaglandin E (PGE) was studied in healthy female subjects.
(9) These results suggest that ammonium ions influence the appetite through their effect on prepyriform cortical areas.
(10) Murine liver extract (LEx) purified by ammonium sulfate (45-70% saturation) possesses a strong inhibitory effect on human lymphocyte proliferation.
(11) The method was based on a pre-column reaction; a fluorescent substance was formed by a coupling reaction between 2 mol of cyclohexan-1,3-dione and 1 mol of acetaldehyde with ammonium acetate.
(12) The purification involved the following steps: (a) ammonium sulfate fractionation; (b) Sephadex G-100 chromatography; (c) DEAE-cellulose chromatography; and (d) hydroxylapatite chromatography.
(13) Two additional quaternary ammonium compounds, tetraethylammonium and N1-methylnicotinamide, were not significantly bound to either tissue.
(14) These effects are due to residual silanols on the surface of the column material and may be remedied by adding suitable amines or quaternary ammonium ions to the eluent as anti-tailing agents.
(15) The crystals grow from solutions of ammonium sulfate during growth periods from several months to a year.
(16) A quantitative thin layer chromatographic (TLC) method has been developed for determination of the antiarrhythmic quaternary ammonium compound N,N-bis (phenylcarbamoyl methyl) dimethylammonium chloride (QX-572) in biological materials.
(17) While currently available antiarrhythmic agents fail to achieve the desired effect, the recent evidence dealing with the quaternary ammonium derivatives of propranolol, lidocaine, and bretylium provides some hope for the future development of drugs with antiarrhythmic as well as antifibrillatory properties which may provide a therapeutic approach to the prevention of SCD.
(18) Ammonium sulphate fractionation followed by immunoaffinity chromatography on a three column system using Protein A-Sepharose coupled D5, produced purified p29.
(19) (a) Ammonium sulphate precipitation and gel filtration on Sepharose 4B.
(20) Separation of bound and free lactoferrin was accomplished by either of two procedures, a double-antibody technique or precipitation in the presence of 50% saturated ammonium sulfate.
Nitrogen
Definition:
(n.) A colorless nonmetallic element, tasteless and odorless, comprising four fifths of the atmosphere by volume. It is chemically very inert in the free state, and as such is incapable of supporting life (hence the name azote still used by French chemists); but it forms many important compounds, as ammonia, nitric acid, the cyanides, etc, and is a constituent of all organized living tissues, animal or vegetable. Symbol N. Atomic weight 14. It was formerly regarded as a permanent noncondensible gas, but was liquefied in 1877 by Cailletet of Paris, and Pictet of Geneva.
Example Sentences:
(1) These results are discussed in relation to the possible existence of enzyme-bound intermediates of nitrogen fixation.
(2) The measurement of the intestinal metabolism of the nitrogen moiety of glutamic acid has been investigated by oral ingestion of l-[15N]glutamic acid and sampling of arterialized blood.
(3) The induction of cells with two Y chromosomes by nitrogen mustard (NM) was examined.
(4) The disappearance of the herbicide, Avadex (40% diallate), from five agricultural soils (differing in either pH, carbon content, or nitrogen content), incubated under sterile and non-sterile conditions, was followed for a period of 20 weeks.
(5) Suspensions of isolated insect flight muscle thick filaments were embedded in layers of vitreous ice and visualized in the electron microscope under liquid nitrogen conditions.
(6) Airway closure (CV), functional residual capacity (FRC) and the distribution of inspired gas (nitrogen washout delay percentage, NWOD %) and arterial oxygen tension (PaO2) was measured by standard electrodes in eight extremely obese patients before and after weight loss (mean weights 142 and 94 kg, respectively) following intestinal shunt operation.
(7) Formula fed infants retained more nitrogen and gained weight faster.
(8) Triglyceride (Trigly) in female dogs, glutamic-pyruvic transaminase (GPT) and urea nitrogen (Urea-N) in male dogs tended to increase.
(9) Nitrogen retention was curvilinear in relation to metabolic live weight (kg0.75) in both series.
(10) Corynebacterium parvum-treated mice produce large amounts of circulating nitrogen oxides and develop a severe liver injury in response to lipopolysaccharide (LPS).
(11) Eight men and eight women each performed peak oxygen intake tests on a cycle ergometer breathing ambient air and a mixture of 12% oxygen in nitrogen (equivalent to an altitude of 4400 m) in the two experiments.
(12) From this, it was suggested that a negligible amount of oestradiol was released from these compounds and that the oestradiol moiety was useful as a carrier for the nitrogen mustard moiety.
(13) The intravenous administration of ovine placental lactogen to pregnant and non-pregnant sheep produced significant acute decreases in plasma free fatty acid, glucose and amino nitrogen concentrations.
(14) In contrast, nitrogen incubation did not alter the basal levels of TBA reactants except for a small rise associated with VE deficiency.
(15) MCT TPN was found to have some disadvantages, especially with regard to nitrogen balance and plasma albumin levels.
(16) Nitrogen mustard (N2M) treatment of rabbits induced neutropenia, and, in ligated ileal loops, it inhibited fluid secretion induced by salmonella or by cholera toxin (CT).
(17) For dipeptides containing the amino terminal residues glycine, alanine and phenylalanine, abstraction of the hydrogen from the carbon adjacent to the peptide nitrogen was the major process leading to the spin-adducts.
(18) The raw data are obtained by capillary gas chromatography using a nitrogen-phosphorus detector.
(19) Total protein, RNA, DNA, nitrogen, free amino acids and water content were determined in both lymphatic organs.
(20) This is the first evidence supporting carbon-nitrogen bond formation as the initial site of interaction between the two substrate molecules.