[The effect of stimulation of the beta-adrenoreceptors on ion and water transport in the distal kidney tubule of the triton].

The ion and fluid reabsorption during perfusion of inter-tubular capillaries with different subtypes of beta-adrenergic agonists was studied in the newt distal tubule using the micropuncture technique and X-ray microanalysis. Isoproterenol (10(-5) M) did not affect the ion and water transport. Stimulation of beta 1-adrenergic receptor with isoproterenol and beta 2-adrenergic antagonist ICI 118.

[Effect of catecholamines on electrolyte and water transport in the nephron of lower vertebrates].

Micropuncture technique and electron microprobe analysis have been used to investigate the role of noradrenalin in ion and water balance in the renal tubules of the lamprey Lampetra fluviatilis and newt Triturus vulgaris. Noradrenalin decreased Na, K, and Ca concentrations in the proximal lumen of the lamprey increasing the value of (TF/P)in from 1.1 +/- 0.

[Role of the condition of serum water in regulating its osmolality in the suslik during spontaneous arousal].

An increase in osmolality, content of total lipids, sodium--free and potassium--free concentrations, and a decrease in magnesium concentration were revealed in suslik blood serum during hibernation and spontaneous awakening. The total water content was not changed. The data obtained suggest that the solvent condition plays a major part in maintenance of the osmotic pressure.

[Regulation of the rate of proximal and distal reabsorption after intratubular injection of cobalt ions].

The effect of cobalt on renal tubular electrolyte and water handling was studied in the newt using the method of stationary microperfusion of the proximal and early distal tubules. Na, K, Ca, Mg and Cl concentrations were measured by electron probe analysis in tubule samples. 3H inulin was used to estimate the net fluid reabsorption.

[Reason for the discrepancy between blood plasma osmolality and its Na+ concentration during cold stress in rats].

The body temperature decrease to 24 degrees C or intraperitoneal injection of adrenaline (0.3 mg per 100 g body mass) to rats entailed the increased plasma osmolality and reduction in it of Na+ concentration. All plasma samples were ultracentrifuged.

[Relation between osmo- and volume-regulation in mammals with different renal capacities for osmotic concentration of urine].

The effect of increase in osmolarity of the blood on osmotic and volume controls has been investigated in Wistar rats, Brattleboro rats and big gerbil by means of i. v. administration of polyethyleneglycol-400 (PEG).

[Role of renal and extrarenal mechanisms in the regulation of sodium blood levels after intravenous administration of hypertonic solution of sodium chloride to the rat].

I. v. administration of 1 M and 2 M NaCl solutions (0.