The renal tubules were investigated with the use of ruthenium red and lanthanum nitrate to titrate the carbohydrate groups which are localized on the differentiated surface of the cell membranes and intercellular spaces. Ruthenium red visualized the surface coat which is tightly bound to the outer lamellae of the cell membrane. Lanthanum nitrate used in this investigations is a valuable marker of the intercellular spaces. The applied markers have visualized in the kidney the canals which are originated from the foldings of membranes of the tubular cells which adhere to the basal membrane. The markers used in combination with the fixative glutaraldehyde-paraformaldehyde give an electrondense envelope of the cell membrane which is more distinct as compared with specimen treated with glutaraldehyde and markers only.
Animals Carbohydrates