[Optical and histochemical polarization studies of the composition of the sialomucin coat at the trophoblast surface of the rabbit placenta depending on the stage of pregnancy].

Polarization microscopical and histochemical investigations were performed in 43 placentas of rabbits from the 10th to the 35th d of pregnancy at the maternal surface of the metabolic barrier of the placenta. The carboxyl groups of sialic acid and of proteins, sulphur containing amino acids of proteins and neutral carbohydrates were detected quantitatively and qualitatively by polarization optical and histochemical investigations. It is possible, that the increase of proteins in case of placenta insufficiency has diagnostic importancy.