[Recapitulation in the development of the components of the counterflow system in the vertebrate metanephros]. / Rekapituliatsiia v razvitii komponentov protivotochnoi sistemy metanefrosa pozvonochnykh.

The investigation has been performed on 107 renal preparations obtained from persons of various age (from 5-month-old fetuses up to 45 years of age), certain representatives of other classes of the Vertebrata are also included: fish, amphibia, reptile and mammalia at various stages of pre- and postnatal periods of ontogenesis by means of preparing graphic and plastic reconstructive models, histological investigation and microdissection. The complexity of the intrarenal branching of derivatives of the mesonephric duct diverticulum, development and structure of the canalicular part in nephrons directly depend on the phylogenetic position of the animal. Complexity of the nephron architectonics occurs along the progressive line of taxonomic groups of higher Vertebrata. The nephron loop becomes longer, thin segment of the nephron canalicular part increases in its length and, at last, in mammalia a cone-shaped fasciculus appears as a structural-functional unit of the osmoregulating apparatus of the constant kidney. In the comparative anatomical and comparative embryological aspects recapitulation is observed concerning certain morphological signs of derivatives of the metanephric duct and nephron.

[Acid-excreting activity of the kidneys in dogs administered ammonium chloride into the carotid artery]. / Kislotno-vydelitel'naia deiatel'nost' pochek u sobak pri vvedenii v sonnuiu arteriiu khlorida ammoniia.

Injection of 0.5 mM of ammonium chloride into the dog carotid artery caused no changes in the blood acid-base balance, but distinctly increased the urinary excretion of both titratable acids and active hydrogen ions. The rate of glomerular filtration was slightly increased. The amount of sodium reabsorbed in the tubules was also risen. The role of humoral factors stimulating the renal acid-excreting activity, is discussed.