[Chronobiological characteristics of renal function under conditions of T4- and T3-hyperthyreosis]. / Khronobiologicheskie osobennosti funktsii pochek v usloviiakh T4- i T3-gipertireoza.

Hyperthyreosis in rats after 10 days of injecting T4 at the dose of 100 mg/kg of the body mass modified the chronostructure of renal functions by decreasing rhythms of the urinal pH mesor, and elevating rhythms of creatinine and protein excretion mesors, and the mesor and the amplitude of sodiuresis rhythms. Temporal readjustment of renal functions reflects peculiarities of the body adaptation to T4-induced hyperthyreosis. Injections of T3 (20 mg/kg of the body mass) during 10 days do not lead to any significant changes in the biorhythmic properties of the renal functions.

[Seasonal changes in the triiodothyronine level of the blood evoked by ultraviolet irradiation in vitro]. / Sezonnye izmeneniia urovnia triiodtironina v krovi, vyzvannye ul'trafioletovym oblucheniem in vitro.

Ultraviolet irradiation (lambda = 254 nm) of the whole blood of juvenile bulls in vitro results in a plasmatic T3 increase dependent on the time of exposure. Dynamics of the growth of hormone content because of UV varies with season. No negative correlation between plasmatic T3 and T4 in irradiated and non-irradiated blood samples was stated. Hence, increased T3 levels in blood after UV irradiation in vitro is a consequence of the output of erythrocyte-deposited hormone rather than photoactivation of the T4 to T3 conversion.