title: [Urea and amino acid transport by an isolated human placenta].
abstract: A method of bilateral perfusion of the isolated human placenta was used to study the urea transport from the fetal placental stream into the maternal one, and of amino acid transport in the opposite direction. Experiments demonstrated that the method provided a sufficiently full perfusion of the intervillous space and offered possibilities for studying the placental transport. With equal amino nitrogen concentration in both circulations, its content in the fetal stream increased during the experiment. This elevation was more expressed when amino acid was added to the maternal circulation. The idea of amino acid "secretion" by the trophoblast cell elements into the fetal circulation was confirmed by the above experiments.
mesh_terms: D000596:Amino Acids / Q000378:metabolism*; D001692:Biological Transport; D005260:Female; D006801:Humans; D066298:In Vitro Techniques; D008431:Maternal-Fetal Exchange; D010920:Placenta / Q000378:metabolism*; D011225:Pre-Eclampsia / Q000378:metabolism; D011247:Pregnancy; D014508:Urea / Q000378:metabolism*
chemical_list: D000596:Amino Acids; D014508:Urea
vernacular_title: Perenos mocheviny i aminokislot izolirovannoĭ platsentoĭ cheloveka