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Journal of Cell Science, Vol 13, 787-797, Copyright © 1973 by Company of Biologists

Submitted on March 8, 1973

Changes in Structure of the Disks of Retinal Rods in Hypotonic Solutions

GERTRUDE FALK 1 and P. FATT 1

1 Biophysics Department, University College London, London WC1E 6BT, England

Changes in isolated frog rod outer segments, suspended in hypotonic solutions, have been examined by light and electron microscopy. Swelling of the disk occurs in hypotonic solutions. When one half or more NaCl is omitted from the Ringer solution used for suspending the rod outer segments, swelling is accompanied by the appearance of localized, irregular expansions projecting as buds from the disks. The axes of the buds tend to be in the plane of the disk, as can be seen in cross-sections of outer segments. In longitudinal sections of outer segments, the sectioned buds have profiles which were previously interpreted as vesicles. Attention is drawn to the properties of the disk edge, among which is a resistance to extension.

Submitted on March 8, 1973




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© The Company of Biologists Ltd 1973