[The behavior of the renin-angiotensin-aldosterone system in rats subject to audiogenic stress].

The behaviour of the renin-angiotensin-aldosterone system in adult albino rats was studied during audiogenic stress (92 dB - 2000 Hz) for different experimental times (4-8-12-16-20-24-28 min). The results show the two-phase behaviour of PRA (plasma renin activity), which is related to aldosterone levels. These changes do not appear to depend on plasma electrolytes (sodium and potassium), while a possible role of ACTH is suggested.

[The gamma-glutamyl transpeptidase (GGTP) as an index for the diagnosis of chronic alcoholic cholestatic hepatitis (author's transl)].

The GGTP is an enzyme localized, in the liver cell, inside microsome. At beginning the use of the GGTP was introduced for the diagnosis of chronic hepatitis; after it was noted as this was steady increased in the cholestasis and in the alcoholism. We have, hence, wanted to experiment if the changing of the level of the GGTP allowed to us a diagnosis of chronic alcoholic hepatitis.