Results 231 to 240 of about 59,957 (280)
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Urological Research, 1979
Urinary stones form as a consequence of urinary supersaturation. Supersaturation occurs as a result of elevated concentrations of urinary solutes. Dietary, metabolic, endocrine, hereditary, and infectious processes alter urinary solute concentrations. Struvite (MgNH4PO.
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Urinary stones form as a consequence of urinary supersaturation. Supersaturation occurs as a result of elevated concentrations of urinary solutes. Dietary, metabolic, endocrine, hereditary, and infectious processes alter urinary solute concentrations. Struvite (MgNH4PO.
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2013
Urease is a nickel-dependent enzyme that catalyzes the reaction of water with urea. The reaction initially produces ammonia and carbamate, which then spontaneously decomposes to yield another molecule of ammonia and hydrogen carbonate. The structure and function of ureases are described.
S. Benini +2 more
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Urease is a nickel-dependent enzyme that catalyzes the reaction of water with urea. The reaction initially produces ammonia and carbamate, which then spontaneously decomposes to yield another molecule of ammonia and hydrogen carbonate. The structure and function of ureases are described.
S. Benini +2 more
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Metal Ion Interactions with Urease and UreD-Urease Apoproteins
Biochemistry, 1996Klebsiella aerogenes urease in a Ni-containing enzyme (two Ni per alpha beta gamma unit) that is purified as an apoprotein from cells grown in Ni-free medium. Partial activation of urease and UreD-urease apoproteins is achieved in vitro by incubation in the presence of Ni(II) and CO2, whereas incubation of these proteins with Ni alone leads to the ...
I S, Park, R P, Hausinger
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Nature, 1948
IN a previous communication1, we were able to confirm that urease is present in the gastric mucosa and, to some extent, in the duodenal mucosa. It was pointed out that the amount of the ferment present in the whole stomach of an animal is sufficient to release enough ammonia from urea to neutralize large amounts of hydrochloric acid.
O, FitzGERALD, P, MURPHY
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IN a previous communication1, we were able to confirm that urease is present in the gastric mucosa and, to some extent, in the duodenal mucosa. It was pointed out that the amount of the ferment present in the whole stomach of an animal is sufficient to release enough ammonia from urea to neutralize large amounts of hydrochloric acid.
O, FitzGERALD, P, MURPHY
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Immobilization of cholinesterase and urease
Analytical Biochemistry, 1970Abstract Procedures are described for the immobilization (insolubilization) of the enzymes cholinesterase and urease in starch and polyacrylamide. Various parameters affecting the immobilization are discussed, and the stability of the insolubilized enzymes in storage and in use is reported.
G G, Guilbault, J, Das
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Journal of the American Chemical Society, 2005
At the active site of urease, urea undergoes nucleophilic attack by water, whereas urea decomposes in solution by elimination of ammonia so that its rate of spontaneous hydrolysis is unknown. Quantum mechanical simulations have been interpreted as indicating that urea hydrolysis is extremely slow, compared with other biological reactions proceeding ...
Brian P, Callahan +2 more
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At the active site of urease, urea undergoes nucleophilic attack by water, whereas urea decomposes in solution by elimination of ammonia so that its rate of spontaneous hydrolysis is unknown. Quantum mechanical simulations have been interpreted as indicating that urea hydrolysis is extremely slow, compared with other biological reactions proceeding ...
Brian P, Callahan +2 more
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Soybean leaf urease: Comparison with seed urease
Physiologia Plantarum, 1983Soybeans, Glycine max (L.) Merr., from ureides for transport of nitrogen from the root nodule to the shoot. The most direct routes for ureide utilization include the degradation of ureide‐derived urea to NH3 and CO2. Ureolytic activity was found in leaf disks of soybean and exhbited optimal activity at pH 7 in the presence of a high concentration of ...
P. S. Kerr +3 more
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Incorporation of urease into liposomes
Biochimica et Biophysica Acta (BBA) - General Subjects, 1977Abstract 1. 1. Urease was entrapped in egg lecithin liposomes. About 1 mg of protein was incorporated per 10 mg of lipid, which corresponds to a molar lipid: protein ration of about 4600. 2. 2. The entrapment procedure led to a change of the apparent Michaelis constant from about 68 mM (free enzyme) to about 167 mM (entrapped enzyme). The V
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American Journal of Physiology-Legacy Content, 1961
Ammonium intoxication in dogs was induced by intravenous administration of urease. This method affords a unique preparation for the study of ammonia metabolism in vivo, since, within limits, a self-perpetuating, cyclic release of ammonia is achieved.
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Ammonium intoxication in dogs was induced by intravenous administration of urease. This method affords a unique preparation for the study of ammonia metabolism in vivo, since, within limits, a self-perpetuating, cyclic release of ammonia is achieved.
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Inhibition of urease by hydroxyurea
Biochemical Pharmacology, 1965Abstract Hydroxyurea was shown to be a potent inhibitor of urease; 50% inhibition occurred at a concentration of approximately 5 × 10−5 M. Preincubation of the enzyme with the inhibitor prior to addition of substrate yielded inhibition which progressed with time, whereas simultaneous addition of inhibitor and substrate to the enzyme reduced the ...
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