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- W1592592777 abstract "An X-ray scattering study was performed on optic nerves dissected from rats aged from ten days to one year. The spectra were analysed using the procedure described in the previous papers of this series. Each experiment yields the values of a variety of parameters: the average D and the variance σD of the repeat distance, the average number 〈N〉 of motifs per crystallite, the fraction αloose of myelin that does not belong to the compact sheaths, the sets idiff(h/D) and imotif(k/2D) that suffice to define, respectively, the spurious scattering and the continuous intensity curve of the elementary membrane pair. A surprising result is that, in the native optic, as previously found in the swollen sciatic nerves, the stacking disorder affects the external space, whereas in native sciatic nerves the disorder affects the cytoplasmic space. An analysis of the evolution of the structure parameters as a function of the age of the animal and a comparison with the results previously obtained with rat sciatic nerves led to the following conclusions: the structure of the elementary membrane pair is constant throughout myelinogenesis; N is much smaller in optic than in sciatic nerves; N and the degree of myelination increase with age in the two types of nerve; D is smaller in optic than in sciatic nerves; in optic nerves, D decreases slightly with age, but in sciatic nerves it increases; σD is strongly age-dependent in optic nerves, but almost age-independent in sciatic nerves. In contrast to sciatic, the structure of optic nerve myelin was found to be almost insensitive to hypertonic solutions. Finally, a pair of electron density profiles was selected, quite similar to those selected previously in sciatic nerves, one corresponding to Caspar & Kirschner's the other to Worthington & Mclntosh's proposals, neither of which can be ruled out according to the criteria used in this work." @default.
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- W1592592777 date "1991-07-01" @default.
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- W1592592777 title "Order-disorder phenomena in myelinated nerve sheaths" @default.
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- W1592592777 doi "https://doi.org/10.1016/0022-2836(91)90018-2" @default.
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