scholarly journals (Isotope tracer studies of diffusion in silicates and of geological transport processes using actinide elements)

1991 ◽  
Author(s):  
G.J. Wasserburg
Keyword(s):  
Transport Processes ◽  
Tracer Studies ◽  
Isotope Tracer ◽  
Actinide Elements

scholarly journals Simulation of the dynamics of nitrogen metabolism in sheep

1976 ◽  
Vol 35 (1) ◽  
pp. 149-174 ◽  
Author(s):  
A. Mazanov ◽  
J. V. Nolan
Keyword(s):  
Mathematical Model ◽  
Nitrogen Metabolism ◽  
Transport Processes ◽  
Simulation Studies ◽  
Tracer Studies ◽  
First Order ◽  
Isotope Tracer ◽  
First Order Kinetics ◽  
Pool Model ◽  
N Metabolism

1. The results of isotope tracer studies of the dynamics of nitrogen metabolism in mature sheep were used to construct a seven-pool mathematical model.2. The model was extended to a nine-pool model, which incorporates lags describing the time taken for the passage of digesta through the gut of sheep.3. Simulation studies using these models satisfactorily predicted results of independent experiments.4. The dynamics of N metabolism in sheep appear to be best approximated by first-order kinetics; that is, many of the important N transport processes are substantially linear or concentration-dependent.

scholarly journals Positional Enrichment by Proton Analysis (PEPA): A One-Dimensional 1 H-NMR Approach for 13 C Stable Isotope Tracer Studies in Metabolomics

2017 ◽  
Vol 56 (13) ◽  
pp. 3531-3535 ◽  
Author(s):  
Maria Vinaixa ◽  
Miguel A. Rodríguez ◽  
Suvi Aivio ◽  
Jordi Capellades ◽  
Josep Gómez ◽  
...  
Keyword(s):  
Stable Isotope ◽  
Tracer Studies ◽  
Stable Isotope Tracer ◽  
One Dimensional ◽  
Isotope Tracer ◽  
H Nmr

Neonatal Respiratory Diseases in the Newborn Infant: Novel Insights from Stable Isotope Tracer Studies

Neonatology ◽  
2016 ◽  
Vol 109 (4) ◽  
pp. 325-333 ◽  
Author(s):  
Virgilio P. Carnielli ◽  
Chiara Giorgetti ◽  
Manuela Simonato ◽  
Luca Vedovelli ◽  
Paola Cogo
Keyword(s):  
Stable Isotope ◽  
Newborn Infant ◽  
Respiratory Diseases ◽  
Tracer Studies ◽  
Stable Isotope Tracer ◽  
Isotope Tracer

Accelerator mass spectrometry: application to study of aluminum kinetics in the rat

1991 ◽  
Vol 260 (3) ◽  
pp. F466-F469 ◽  
Author(s):  
O. Meirav ◽  
R. A. Sutton ◽  
D. Fink ◽  
R. Middleton ◽  
J. Klein ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Renal Clearance ◽  
Intravenous Injection ◽  
Accelerator Mass Spectrometry ◽  
Ultrasensitive Detection ◽  
Tracer Studies ◽  
Isotope Tracer ◽  
Tracer Dose ◽  
Normal Rat ◽  
Mass Spectrometry Application

The advent of accelerator mass spectrometry (AMS) now permits the ultrasensitive detection of extremely long-lived isotopes, including 14C, 26Al, and 41Ca. Until now, tracer studies of aluminum kinetics have not been possible because aluminum has only two isotopes, with half-lives of 6.5 min (29Al) and 7 x 10(5) yr (26Al), neither of which is suitable for conventional studies. In a novel experiment we have employed AMS to study aluminum kinetics in a normal rat and a 5/6-nephrectomized rat over a 3-wk period of intravenous injection of a tracer dose of 26Al. Kinetics were similar in the two animals; approximately 75% of intravenously injected tracer 26Al was excreted in the urine in the first 24 h as was approximately 80% after 3 wk. Renal clearance of 26Al was approximately 0.75 ml.min-1.kg body wt-1 in both rats. The results clearly demonstrate the potential of this technique for isotope tracer studies in animals as well as in humans.

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