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Figure 1
(a) Image of the central section through a frog eye obtained by phase-contrast X-ray tomography using a Talbot grating interferometer (Hoshino et al., 2011BB11). The rod is located at the outer rim of the retina and the outer segment is pointing away from the light. (b) Schematic drawing of the arrangement of the disk membranes in a rod outer segment. Each disk membrane comprises of a pair of bilayers. d is the inter-disk spacing, while a is the intra-disk distance, i.e. the distance between two bilayers in one disk. Since d is about 30 nm and the length of the rod outer segment is about 50 µm, the number of disk membranes is about 1500. The electron density profile across two disk membranes is represented schematically.

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SYNCHROTRON
RADIATION
ISSN: 1600-5775
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