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- W2029198045 abstract "Disorder in the stacking of membrane layers in nerve myelin has an important effect on the X-ray diffraction pattern. In a previous report we found broadening of the Bragg reflections and diffuse intensity between them. A model for the disorder was presented to account for these effects, and some of the model parameters were evaluated by analysis of the X-ray diffraction pattern in the region of Bragg reflections 1 to 6, where the phasing is well established. In this paper, we present further data and derive a more complete and precise set of values for the parameters. Then, assuming these values, all possible combinations of phases for reflections 7 to 15 are used to calculate the corresponding diffraction patterns for comparison with observation. The 20 best fitting phase combinations are considered in detail. Sixteen of these are eliminated, leaving four possible combinations which differ only in the phases for orders 8 and 15. Electron density profiles computed using the four possible phase combinations are not very different from one another. All four profiles show a markedly higher electron density in the extracellular half of the membrane bilayer than in the cytoplasmic half. Our calculations indicate that the cytoplasmic half can be accounted for entirely by myelin lipids, including cholesterol. However, an unreasonably high proportion of cholesterol would be needed to account for the extracellular half of the bilayer, and we tentatively conclude that an appreciable part of the myelin protein is inserted into this half of the bilayer. Analytical methods used by other investigators are considered in light of our experimental observations and model predictions in order to reconcile conflicting results. Failure to account properly for diffuse intensity arising from the disorder makes previous determinations of myelin membrane structure at moderate resolution questionable." @default.
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- W2029198045 date "1978-02-01" @default.
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- W2029198045 title "Disorder in nerve myelin: Phasing the higher order reflections by means of the diffuse scatter" @default.
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- W2029198045 doi "https://doi.org/10.1016/0022-2836(78)90287-5" @default.
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