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- W2048723258 abstract "Abstract— A segment, defined by gross anatomic boundaries, which comprises most of the sciatic nerve was dissected from rabbits aged from birth to 1 yr. The mean and standard deviation of the variance determined for the weights of pairs of nerve units removed from single animals of an age group did not exceed 2·7 per cent and 12·3 per cent respectively of the average weight of the two nerve units which were the values determined for a group of newborn animals. During the period from birth to one year of age, the weight and length of the nerve unit increased 47- and 6-fold respectively while the animal's weight increased 78-fold. Whereas the nerve unit length increased little after 8 weeks, its weight and that of the whole animal continued to increase up to 1 year. Estimations of nucleic acids in the nerve unit from adult animals gave values of 54 μg DNA-P and 25 μg RNA-P per g fresh weight. During the period birth to 1 yr the absolute amount of DNA in the nerve unit increased 11-fold, 71 per cent of this having occurred by 6 weeks of age. The absolute amount of RNA increased 11 -fold by 8 weeks of age and remained constant thereafter. During the period birth to 1 yr, the proportion of the nerve constituents accounted for by lipid-free solids remained constant at 10 per cent, while lipids increased from 5 to 18 per cent and tissue water declined from 84 to 71 per cent. Changes in some lipid classes were examined also. Increases of absolute content in the nerve unit over the first year and concentrations on a fresh weight basis attained in year-old animals were as follows: cholesterol, 132-fold and 86 mg/g; triglyceride 554-fold and 43·2 mg/g; total phospholipid, 85-fold and 61 mg/g; cerebroside 205-fold and 28 μmol/g; sulphatide, 154-fold and 10 μmol/g; monogalactosyl diglyceride, 31-fold and 0·6 μmol/g. The ratio cholesterol/phospholipid/galactolipid in whole nerve units from adult animals was 2·0/2·1/1·0 and the change in this ratio in the first year was compatible with enrichment of myelin in galactolipid during myelination. The ratio of cerebroside to sulphatide increased from 2·0 to 2·6 during this period. Increases in absolute content and concentrations attained for sialic acid-containing components representing cell surface constituents were as follows: ganglioside sialic acid, 33-fold, and 83 μg/g; glycoprotein sialic acid, 57-fold and 371 μg/g. The quantitative pattern of ganglioside fractions separated by thin-layer chromatography in one direction resembled that of whole brain and was the same at all ages studied. The changes reported reflect a composite picture of changes in a variety of cell membranes indicative of marked variation during development in quantity and composition of membranes." @default.
- W2048723258 created "2016-06-24" @default.
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- W2048723258 date "1974-11-01" @default.
- W2048723258 modified "2023-09-23" @default.
- W2048723258 title "CHANGES IN THE SCIATIC NERVE OF THE RABBIT AND ITS TISSUE CONSTITUENTS DURING DEVELOPMENT" @default.
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- W2048723258 doi "https://doi.org/10.1111/j.1471-4159.1974.tb10751.x" @default.
- W2048723258 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/4436685" @default.
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