[Current state and perspectives of the use of the 15N-tracer technic in gastroenterologic studies].

The importance of 15N as tracer in medical research is increasing. Since 1965 many results were obtained in cooperation of surgeons (Surgical clinic of Karl-Marx-University; Bezirkskrankenhaus St. Georg, Leipzig) and coworkers of Central Institute of Isotope and Radiation research. Using 3 test models (15N-labelled amino acid solution, permanent infused; 15N-labelled glycine, given as one single dose; 15N-labelled casein, oral given) healthy persons, patients in stress condition and after gastric operations and rats after performing several types of gastric operations were studied. Possibilities of calculations with mathematical models are shown.