Book Description

Excerpt from The University of North Carolina Record; October 20, 1936, Vol. 311: Research in Progress, October, 1935-October, 1936 The Role Of Blood Cells in Excretion in Ascidians. Biological Bulletin, 71: 249-254. 1936. In many ascidians in which there are no renal vesicles the wastes Of purine metabolism appear to be withdrawn from the tissue fluids by cells Of the connective tissue and blood. Vesicular cells with stored excretion products have been found in the circulating blood or fixed in the connective tissue spaces of, many Species. The excretion granules may range in size from the limits Of visibility with the highest powers Of the microscope to intracellular calculi several microns in diameter. In the living cells they are sometimes, probably always, one color (usually brown) by transmitted light and another color (usually white) by reflected light. The structure Of these cells and the icon centration of purine bases within the vacuoles indicate that extremely thin protoplasmic membranes may act in a glandular capacity, or at least as selec tive excretory membranes. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.