Small-angle X-ray data processing for planar multilayered structures. 2. Experimental determination of the parameters for retinal photoreceptors and sarcoplasmic reticulum membranes

The Fourier-transform values are obtained by multiplying the integrated intensities of X-ray patterns by the correction factor C(h). The problem of determining C(h) for biological specimens which have a planar multi-layered structure and which remain stationary during the X-ray experiment is treated. Parameters for evaluating C(h) can be obtained from pinhole (limited slit) collimated small-angle X-ray diffraction patterns. Two biological structures, namely retinal photoreceptors and sarcoplasmic reticulum membranes have been studied. Correction factors for these structures have been experimentally measured.