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  • Articles  (2)
  • 5.8s rRNA  (1)
  • Cell & Developmental Biology  (1)
  • 1975-1979  (2)
  • 1935-1939
  • 1890-1899
Collection
  • Articles  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    The rates of evolution in some ribosomal components (1977)
    Springer
    Journal of molecular evolution 9 (1977), S. 191-201 
    Details
    ISSN: 1432-1432
    Keywords: Substitution rates ; 5s rRNA ; 5.8s rRNA ; Ribosomal proteins ; Pattern of amino acid substitution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The rate of nucleotide substitution (k(nuc)) of 5s RNA was estimated to be (1.8 ± 0.5) × 10−10 per site per year by comparing the nucleotide sequences of human andXenopus 5s RNA and using the geological time elapsed since the separation of mammals and amphibians. Similarly, k(nuc) of 5.8s rRNA was calculated to be 0.93 – 1.4 × 10−10 per site per year from the sequences of rat hepatoma cells andSaccharomyces cerevisiae. For the comparison of these data with the amino acid substitution rate of known proteins, the k(nuc) values of 5s rRNA and 5.8s rRNA were converted to the rate of amino acid substitution (k(aa′)). The k(aa′) values in pauling units were 0.4 and 0.2 – 0.3, respectively. The average k(aa) of ribosomal proteins was also estimated to be 0.2 – 0.3 pauling from the N-terminal amino acid sequences of seventeen 30s ribosomal proteins ofBacillus stearothermophilus andEscherichia coli. Thus, the evolutionary rates of these ribosomal components studied here are similar to each other; they are considerably slower than that of the known cellular proteins. Most, if not all, of the replacements in ribosomal proteins occurred between amino acids of a chemically similar nature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01796108
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  • 2
    Electronic Resource
    Electronic Resource
    The accumulation of manganese from the environmental medium by the egg of Oryzias latipes (1979)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Cellular Physiology 98 (1979), S. 241-243 
    Details
    ISSN: 0021-9541
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: The manganese content of the egg and embryo of the Medaka, Oryzias latipes was determined by activation analysis. A remarkable increase in the amount of manganese in the egg was observed within one hour after fertilization. The rate of increase was reduced by the gastrula stage and the concentration of manganese remained unchanged at a later stage. The accumulation of manganese by the Oryzias egg was discussed in relation to the effect of manganese on respiratory enzyme systems.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jcp.1040980126
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