(a.) A very soluble crystalline body which is the chief constituent of the urine in mammals and some other animals. It is also present in small quantity in blood, serous fluids, lymph, the liver, etc.
Example Sentences:
(1) These data suggest that the hybrid is formed by the same mechanism in the absence and presence of the urea step.
(2) The fourth cluster included the type strains of Actinobacillus lignieresii, A. equuli, A. pleuropneumoniae, A. suis, A. ureae, H. parahaemolyticus, H. parainfluenzae, H. paraphrohaemolyticus, H. ducreyi, and P. haemolytica.
(3) Thymus and spleen cells from such hypogammaglobulinaemic chickens were extracted with non-ionic detergents, acid urea, or combinations of urea and detergent, and the extracts were analysed for Ig by the inhibition assay.
(4) Triglyceride (Trigly) in female dogs, glutamic-pyruvic transaminase (GPT) and urea nitrogen (Urea-N) in male dogs tended to increase.
(5) The two main subunits present in rabbit skeletal tropomyosin, which have been named the alpha- and beta-chains, were separated by chromatography on CM-cellulose in urea at pH4.0.
(6) The temperature-activated 4 to 5 S EBP transformation is found to be highly reproducible without loss of [3H]estradiol-binding activity in a buffer containing an excess of [3H]estradiol, 40 mM Tris, 1 mM dithiothreitol, and 1 M urea at pH 7.4.
(7) The blockage of the tubular system by the calcium oxalate deposits leads to a temporary reversible increase in serum urea and serum creatinine.
(8) Urea was determined by means of diacetyl monoxim in the blood cells of 80 cockerels of the initial breed White Leghorn, commercial hybrid Primant.
(9) Urea decreased and valine increased in the TD medulla-pons.
(10) The complex was found to be unstable toward low values of pH and ionic strength, concentrations of urea exceeding 1 M, modifications of the cysteine residues, and fragmention in which the C terminal portions of either H3 or H4 are removed.
(11) The decrease in the amount of excreted urea by 85% was also accompanied by a reduced glomerular filtration rate (GFR).
(12) The modified osmium-urea method gave better results and was easier to perform than the collagenase method.
(13) Conversely, when fed NIH-07, both mouse genotypes had a 20-22% higher (p less than 0.003) serum urea nitogren and 2-3.5% higher erythrocyte count (p less than 0.001) and hemoglobin concentration (p less than 0.04) than when fed AIN-76A.
(14) (7) The first-order radical transformation rates are independent of the (initial) concentration of N3 or peptide and unaffected by urea (as a modifier of hydrogen bond structures).
(15) Treatment of the enzyme with acid and urea resulted in dissociation of the enzyme followed by loss of catalytic activity.
(16) 6) The subunits alpha and beta of bovine follitropin were obtained by incubation in acidic urea, the chains being then separated by anion exchange chromatography.
(17) There were no major differences in blood composition, apart from increases in blood urea N, as a result of N fertilization.
(18) In contrast to the facilitated water and urea transport systems in the red blood cell, these results suggest that the mechanism for water and urea transport in the platelet is primarily by diffusion through membrane phospholipid.
(19) A significant treatment X time interaction was found for plasma urea.
(20) The disc-gel patterns of the 8 m urea-soluble proteins showed that C. perfringens caused extensive proteolysis in pig muscle and a lesser extent of proteolysis in rabbit muscle.
Ureide
Definition:
(n.) Any one of the many complex derivatives of urea; thus, hydantoin, and, in an extended dense, guanidine, caffeine, et., are ureides.
Example Sentences:
(1) The enantiomeric ureides were prepared by a room-temperature, 60-second procedure, accomplishing simultaneous extraction and derivatization and utilizing achiral 3,5-dinitrophenyl isocyanate as reagent.
(2) Twelve numerical descriptors were used as variables in a discriminant function analysis which categorized the ureide analogues with respect to their bioactivity.
(3) These nodules synthesize large quantities of purines because nitrogen fixed by bacteria contained within this tissue is transferred to the shoots in the form of ureides, which are degradation products of purines.
(4) The 4-hydroxylation of the benzene ring and the C 3 hydroxylation of the aliphatic chain led to the formation of two major metabolites: 2-(4-hydroxyphenyl)-butyroylurea (70.5%) and 3-hydroxy-2-phenyl-butyroylurea (19.6%), whereas the hydrolysis of the ureide function was less important.
(5) Ureidoglycolate is an intermediate of allantoin catabolism in ureide-transporting legumes.
(6) Classes of drugs included in this study are pyridine derivatives, hydrazines, pyridylamine derivatives, variously substituted phenols, barbiturates, ureides, imides, hydantoins, and conjugted ketones (enones).
(7) Racemic phenylpropanolamine was resolved on a high performance liquid chromatographic (HPLC) chiral stationary phase (CSP) as the 3,5-dinitrophenyl ureide derivative.
(8) Intermediates of ureide metabolism (allantoin, allantoic acid, uric acid, inosine, xanthosine, and XMP) did not affect the enzyme, while AMP, GMP, and NADH were inhibitors.
(9) The authors present their results from the treatment of urological infections with the new semisynthetic penicillin antibiotic azlocillin (acyl-ureide-penicillin) in 86 patients with various, in kind and clinical manifestations, infections of the urinary system.
(10) A series of ureides active against grand mal epilepsy have been studied by using classical potential energy calculations.
(11) The conformational studies led to the proposal of a general model for anticonvulsant activity comprising two aromatic rings or their equivalent in a favored orientation and a third region, usually a cyclic ureide, comprising a number of hydrogen-bond-forming functional groups.
(12) The significance of the properties of IMP oxidoreductase for regulation of ureide biosynthesis in legume root nodules is discussed.
(13) Specific pharmacokinetic aspects of bromide and bromo-ureide are outlined and the clinical features of chronic bromine poisoning are considered with reference to possible diagnostic errors.
(14) Albiciine (alpha-amino-beta-ureide propionic acid) proved to be the strongest inhibitor (100%).
(15) In the case of mixed anhydrides formed from acid derivatives of which vicinal carbon atoms of ethylene bond built on into appropriate cyclic system were connected with methyl and carboxylic group (-C)CH3=C(COOH(-), it was found, that the main reaction products were: the suitable ureids and ethoxypenicillin or ethoxydesacetylcephalosporin.
(16) The hydrolysis of the ureide function and the 4-hydroxylation of the benzene ring led to the formation of two major metabolites: 2-(4-hydroxyphenyl)-butyroylurea (37.5%) and 2-phenylbutyric acid (40.6%), and to one minor metabolite: 2-(4-hydroxyphenyl)-butyric acid (11.9%).
(17) In G. max ureides apparently are metabolized via an amidohydrolase reaction with subsequent degradation of ureidoglycine, yielding glyoxylate, NH+4 and CO2.
(18) It has been demonstrated with an in vitro model that hemoperfusion through Amberlite XAD4 or coated charcoal containing cartridges eliminates carbromal and its ureid derivatives more efficiently than hemodialysis.
(19) In leaves of nitrogen-fixing legumes, this reductase may also be involved in ureide breakdown, utilizing the glyoxylate produced during allantoate metabolism.
(20) Ultrastructural specialization for ureide synthesis, characteristic of legumes that form determinate nodules, was absent.