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The heat shock (HS) response is an adaptation of organisms to elevated temperature. It includes substantial changes in the composition of cellular membranes, proteins and soluble carbohydrates. To protect the cellular macromolecules, thermophilic organisms have evolved mechanisms of persistent thermotolerance. Many of those mechanisms are common for(More)
The composition of the membrane lipids and cytosol soluble carbohydrates under three kinds of unfavorable impacts (osmotic, oxidative, and cold) was studied. Changes in the composition of the membrane lipids, specifically, increasing content of phosphatidic acids and decreasing levels of phosphatidylcholines and phosphatidylethanolamines, were the general(More)
The pathways of hypothalamic control of the adrenal cortex function were studied in the experiments on young and old male Wistar rats. Immunohistochemical, morphometric, densitometric and radioimmunoassay methods were used. It was shown that in young rats under stress vasopressin (VP) is released into the portal circulation and probably in this way(More)
The regeneration of the hypothalamo-hypophyseal system (HHS) has been studied in the sterlet following hypophysectomy (HypoX). Significant portions of nonapeptide and corticoliberinergic (CRH) neurosecretory cells (NSCs) underwent degeneration. Surviving NSCs had a great regenerative ability; damaged axons formed anew, uncharacteristicly for intact fishes,(More)
Hypothalamo-pituitary neurosecretory system (HPNS) of the Northern redbacked vole, Clethrionomys rutilus was studied at different stages of the population cycle using paraldehyde-fuchsin staining and immunohistochemical revealing of vasopressin and oxytocin. We found at the stages of high voles number (peak and recession), an increase of vasopressin(More)
The hypothalamic region and the neural lobe of rats from the 16th foetal day to adult animals have been studied for acetylcholinesterase and cholinesterase activity after Karnovsky. The attention was focused on the magnocellular nuclei-supraoptic and paraventricular, the median eminence and the neural lobe. Acetylcholinesterase activity appears in the(More)
Light-microscopic immunohistochemical study of the brain with use of the unlabeled antibody to gonadotropin-releasing hormone (GnRH) was carried out on sexually mature individuals of the sturgeon of stage IV of gonadal maturity (before spawning). The brain was examined as a whole; the GnRH-immunoreactive (GnRH-IR) structures were revealed in the olfactory(More)
Corticoliberine-like activity of the paraventricular nucleus area and median eminence, concentration of plasma 11-oxycorticosteroids and total blood calcium were studied after parathyroidectomy, parathyroid hormone of calcium gluconate injections in rats. Hypercalcemia and especially parathyroid hormone stimulated the production and release of(More)
Hypothalamo-hypophyseal neurosecretory system (HHNS) of 1-30 days old lemmings Dicrostonyx torquatus from the Wrangel Island in the year of a decreased but still highly dense population was studied by paraldehyde fucshin method and immunohistochemically using antisera to vasopressin and oxytocin. In the period of first two weeks of postnatal development the(More)