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Embryonic differentiation of fibre types in normal, paralysed and aneural avian superior oblique muscle.
J Embryol Exp Morphol
July 1986
The influence of innervation on the initial differentiation of muscle fibre types was investigated by using the trochlear nucleus-superior oblique muscle system of duck. The adult muscle is composed of three types of fibres (designated as type I, II, III) as identified with the histochemical techniques for ATPase pH sensitivity. Type I fibre ATPase activity was acid-stable, alkali-labile; type II alkali-stable, acid-labile; and type III both acid- and alkali-stable.
View Article and Find Full Text PDFThe low molecular weight RNA species which have been purified and characterized in this laboratory (T.S. Ro-Choi and H.
View Article and Find Full Text PDFA comparison was made of muscle from two locations in both the longissimus and the semitendinous muscles of normal and malignant hyperthermia-susceptible swine. Serial frozen sections were stained for alkali-stable adenosine triphosphatase (ATPase), phosphorylase, and the oxidative enzymes succinate dehydrogenase and reduced nicotinamide adenine dinucleotide (NADH)-diaphorase. Myofiber types were identified on the basis of these staining reactions.
View Article and Find Full Text PDFThe effects of histidine starvation on the methylation of ribosomal RNA.
Eur J Biochem
September 1977
The effect of amino acid starvation on the control of ribosome biosynthesis at the post-transcriptional level has been studied in Ehrlich ascites cells. A comparison of the turnover rates of ribosomal precursor RNA (pre-rRNA) and the degree of methylation of ribosomal RNA after histidine deprivation revealed that the slow down of ribosome formation is accompanied by a significant inhibition of rRNA methylation. Analysis of nucleolar and cytoplasmic RNA double-labelled with L-[Me-3H]methionine and [14C]uridine, as well as a quantitative determination of alkali-stable dinucleotides on DEAE-Sephadex, showed that methylation of rRNA species was inhibited by about 50% under shift-down conditions.
View Article and Find Full Text PDFTwo hypermodified, alkali-stable dinucleotide sequences, each containing a base modification in addition to sugar methylation, are known to be present in wheat embryo 26S + 18S rRNA (Gray, M.W. (1974) Biochemistry 13, 5453-5463).
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