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- W1489756129 abstract "The algorithm described in the accompanying paper was applied to X-ray scattering experiments performed with rat sciatic nerves, either as a function of the age of the animal (4 to 30 days), or with adult nerves swollen in non-isotonic media. The results were all consistent with the model of disorder used in the theoretical treatment. The algorithm leads, in one step, from the data to the numerical values of the parameters, avoiding all intermediate manipulation. For each experiment a variety of parameters was determined: the average D and the variance σD/2 of the repeat distance, the average number <N> of motifs per crystallite, the set {idiff(h/D)}, which defines the diffuse scattering, the fraction αloose of myelin that does not belong to the compact sheaths, and the set {imotif(k/2D)}, which suffices to define the continuous intensity curve of the motif imotif(s). Note the remarkable wealth of information, especially by contrast with conventional analyses which, as a rule, only yield the values of D and of the set {imotif(h/D)} (insufficient to determine the function imotif(s)). The function imotif(s) and the parameters D and σD (and thus the local structure of the myelin sheaths) were shown to be almost invariant in the course of myelinogenesis; what varies is mainly the total amount of myelin in the nerve and the number of membranes per sheath. Swelling agents have a dramatic influence on the X-ray scattering spectra, but in spite of the conspicuous variation of D, σD and <N> the structure of the motif is invariant. The structure of the motif was shown to be quite different in the native and in the swollen samples: the stacking disorder appears to involve mainly the cytoplasmic space in native myelin, the external space in swollen nerves. The very notion of electron density profile, when disorder is present, is discussed. Two criteria were proposed to select the “best” signs of the reflections: two sets came out at almost the same rank, one corresponding to Caspar & Kirschner's the other to Worthington & McIntosh's proposals, neither of which can be ruled out according to the criteria used in this work." @default.
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- W1489756129 date "1990-10-01" @default.
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- W1489756129 title "Order-disorder phenomena in myelinated nerve sheaths" @default.
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- W1489756129 doi "https://doi.org/10.1016/s0022-2836(05)80359-6" @default.
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