Protein concentration in the arterial and venous renal blood serum of the rabbit

In normal rabbits, under Nembutal anesthesia, the total protein and albumin content of the arterial blood serum are significantly higher than the same fractions of the renal venous blood serum. This condition is reversed in the rabbits after removal of more than 15 ml. blood/kg.Renal innervation plays a role in the regulation of the protein concentration in the renal venous blood, after hemorrhage.No significant difference of protein fractions in the arterial and renal venous blood sera has been observed in a series of rabbits with experimental renal hypertension.Parallel estimations of color intensity of previously injected Evans Blue, and of the protein fractions (by electrophoretic and turbidimetric methods) in the arterial and renal venous blood specimens of normal rabbits corroborate the possibility of a renal mechanism of albumin storage.     

The Peltier Effect and its Use in the Measurement of Suction Pressure

1. A method is described by means of which the suction pressureof living material may be measured by observations on its equilibriumvapour pressure.
2. It employs a very fine thermocouple whosetip is cooled by meansof the Peltier effect, below the dew-point.It collects a minuteamount of dew, and can thus be used asan exceedingly fine ‘wet-bulb’thermometer. As suchit is convenient to use, quick in action,and causes very littledisturbance to the system under observation.
3. The thermocoupleis calibrated by means of salt solutions ofknown strength.The scale is fairly linear.
4. The method possesses the advantagesof giving the suction pressureby direct observation ratherthan by interpolation; of speedin the actual measurement; ofnot subjecting the tissue to immersion;and of permitting organslike leaves, otherwise difficult tohandle, to be easily dealtwith. It also opens possibilitiesoutside the range of the conventionalmethods.