(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.
Quat
Definition:
(n.) A pustule.
(n.) An annoying, worthless person.
(v. t.) To satiate; to satisfy.
Example Sentences:
(1) The results show sustained brain levels of E2-Quat and prolonged half-life in brain compared to six peripheral tissues measured.
(2) The quaternaries present in organoclays (e.g., BENTONE type products) can also be identified by prior destruction of the silicate with hydrofluoric acid followed by chromatography of the residual quat fluorides.
(3) A reversed-phase high-performance liquid chromatographic (HPLC) method is presented for the analysis of E2-CDS and its oxidized quaternary metabolite (E2-Quat) in biological fluids or tissues.
(4) This surface complexation reaction was studied in detail by using a spin-labelled quat of intermediate allergenicity.
(5) The only exception was a Quat which did not disinfect fully even after 18 hours application.
(6) Two of the quats tested were found to be strong allergens which was due to stable association with membrane lipids at the surface of epidermal cells.
(7) A homologous series of eight quaternary ammonium salts (quats) were used as complex cations in a survey of contact hypersensitivity in guinea pigs.
(8) Mixtures of aliphatic and aromatic "quats" can be qualitatively identified in a one step chromatographic run.
(9) The effects of 26 different cosmetic ingredients (e.g., permanent wave and hair dye compounds, emulsifiers, resins, and detergents such as quats) were assessed by four end points indicative for qualitatively and quantitatively different cytotoxicity: (1) neutral red uptake reduction after 24 h of treatment (NR-90 and NR-50); (2) cell detachment from culture dish after 4 h of treatment (CD-25); (3) growth inhibition after 48 h of treatment (GI-50); and (4) membrane permeability measured by fluorescent dye retention (fluorescence shift FS-25) and dye exclusion (viability ratio VR-25).
(10) Previous work has indicated that a modified Quate-Lemons scanning acoustic microscope (SAM) is capable of measuring the acoustic propagation properties of sections of biological tissue.
(11) As the tiny ferry pushed through the waves and mist, marketing officer Amanda Anderson was busy on the phone to Raymond Blanc's Le Manoir aux Quat'Saisons , which has added it to its daily breakfast menu.