Changes in renal inactivation of angiotensin II in rats with hereditary spontaneous hypertension.

The inactivation of the pressor effect of angiotensin II by the renal vascular bed is less in spontaneously hypertensive rats than in normal rats. This phenomenon, which is observed only in adult animals but not in young ones, may be due to a slowing in the functional maturation of the kidney tissue.

Determination of body fluid compartments by electrical impedance measurements.

?The ratio of the LF and HF impedances appears to be an excellent and simple tool for investigation of liquid specimens, either of the total human body, taking into consideration global impedances, or of a particular organ, taking into consideration local impedances. We have sketched out in this communication a study of the global impedance ratio variations with age, but a large number of studies still remain to be undertaken in those cases of severe denutrition, as in all cases of metabolic illnesses. We can state that, in most cases, not only does the ratio decrease but that there is extreme difficulty in reestablishing normal values.