RATE OF EXCRETION OF N15 AFTER FEEDING N15-LABELED l-ASPARTIC ACID IN MAN
نویسندگان
چکیده
منابع مشابه
RATE OF EXCRETION OF N15 AFTER FEEDING N15-LABELED l-ASPARTIC ACID IN MAN
1. l-Aspartic acid labeled with N(15) was fed to one human adult and six infants, and the total N and N(15) were determined in the urine from time to time. 2. The N(15) concentration (or isotopic ratio) of urinary N reached its maximum in the adult about 2 hours and in the infants about 4 hours after feeding, then fell off logarithmically. 3. Assuming that the N of aspartic acid readily entered...
متن کاملRelative Concentrations of N15 in Urinary Ammonia N and Urea N after Feeding N15-labeled Compounds
Available data on the isotopic ratio See PDF for Equation of ammonia (r(a)) and that of urea (r(u)) after a single feeding of glycine, aspartic acid, and ammonium citrate are analyzed. From this analysis the following conclusions are drawn. 1. The isotopic ratio See PDF for Equation of ammonia (r(a)) is always higher than that of urea (r(u)) in the initial period after a single feeding of isoto...
متن کاملStudies of the metabolism of tryptophan labeled with N15 in the indole ring.
Recent interest in tryptophan metabolism has been stimulated by evidence that tryptophan is a precursor of nicotinic acid in mammals (1) as well as in Neurospora CTUSSU (2). The formation of kynurenine, kynurenic acid, and xanthurenic acid from tryptophan has been demonstrated by numerous experiments (3-5) and has been confirmed by isotope technique in the case of kynurenine and kynurenic acid ...
متن کاملIncorporation of N15-L-aspartic acid into the abnormal serum and urine proteins of multiple myeloma; studies of the inter-relationship of these proteins.
In a consideration of the abnormalities of protein metabolism observed in multiple myeloma, a number of fundamental problems remain unsolved. To state just two of these, it remains to be determined (a) precisely what relationship the abnormal serum globulins of myeloma bear to normal serum gamma globulin, and (b) what is the nature of the possible inter-relationship between the abnormal serum p...
متن کاملStudies of the effect of dietary protein and caloric levels on the kinetics of nitrogen metabolism using N15 L-aspartic acid.
There have been relatively few attempts to study the dynamic aspects of nitrogen metabolism from the standpoint of the intact overall organism. The complexity of the problem precludes an exact mathematical description at present, but models which purport to enable one to compute values for nitrogeneous metabolic pool size and rate of incorporation of nitrogen into the human have been devised by...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Journal of General Physiology
سال: 1951
ISSN: 1540-7748,0022-1295
DOI: 10.1085/jgp.34.3.339