Ultrathin Sectioning of Fixed but Unembedded Tissue
This is intended as a progress report to demonstrate that it is feasible within limits to section unembedded, glutaraldehyde-fixed tissue thinly enough for transmission electron microscopy. Much cytological detail will be preserved. The work has been predicated upon a demonstration of J.L. Farrant and J.D. McLean1 that x-linking concentrated serum albumin gel with glutaraldehyde can produce an adequate support for sectioning small biological objects such as erythrocytes, small algae, bacteria, and mitochondria. Subsequently, G.L. Nicolson2 utilized the same technique to obtain interesting sections of isolated chloroplasts. These experiments suggested to me that the proteins of the cytosol of many cell types might also be adequately x-linked with glutaraldehyde to permit ultrathin sectioning if the specimens could otherwise be suitably supported.