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  • 1
    Electronic Resource
    Electronic Resource
    LDH-B genotype-specific hatching times of Fundulus heteroclitus embryos (1982)
    [s.l.] : Nature Publishing Group
    Nature 296 (1982), S. 563-564 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The LDH-B polymorphism in R heteroclitus is due to two co-dominant alleles25'26 which exhibit a cline in gene frequencies along the Atlantic Coast of the United States4'27. We have shown that there are temperature- and pH-dependent kinetic differences between the LDH-B allelic isozymes7. Moreover, ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/296563a0
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  • 2
    Electronic Resource
    Electronic Resource
    Similarities between l-Phenylalanine and m-Fluorophenylalanine as Substrates for l-Phenylalanine Ammonia-Lyase (1976)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 37 (1976), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: The ability of l-phenylalanine ammonia-lyase (E.C. 4.3.1.5) to metabolize dl-m-, dl-o- and dl-p-fluorophenylalanine in Avena sativa has been examined. Although all three amino acid analogues served as substrates for this enzyme, there was a marked difference in the behavior of the meta isomer from that of the para and ortho species. The Michaelis constant for the meta analogue was similar to that obtained for the natural substrate, l-phenylalanine, but distinct from the kinetic data for the para and ortho isomers. In addition, in vivo analyses demonstrated that both l-phenylalanine and the meta-fluoro-derivative served to protect against chlorogenic acid loss, whereas previous studies have shown that the para and ortho species depressed levels of this phenolic derivative. Finally, treatment of coleoptile apices with either the meta isomer or l-phenylalanine reversed dl-p-fluorophenylalanine stimulated growth and attendant reduction in chlorogenic acid content. These findings provide further clarification of the effects of fluorophenylalanines upon l-phenylalanine ammonia-lyase mediated biosynthesis of low molecular weight phenols in Avena.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1976.tb03972.x
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  • 3
    Electronic Resource
    Electronic Resource
    Quantitative Assay of Cyclin-Dependent Kinase Activity As a Sensitive Marker of Cell Proliferation in Marine Teleost Larvae (1999)
    Springer
    Marine biotechnology 1 (1999), S. 297-310 
    Details
    ISSN: 1436-2236
    Keywords: Key words: cell proliferation, Cdks, MPF, suc1, growth, teleost
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract: An evolutionarily conserved family of cyclin-dependent kinases (Cdks) regulates cell cycle progression in eukaryotes. Mitosis-promoting factor (MPF) is a transiently activated Cdk required for mitosis. We propose use of partially purified MPF kinase activity as a sensitive marker of cell proliferation in marine teleost larvae and describe a quantitative spin-filter assay of suc1-precipitated MPF activity. MPF extracted from embryos and larvae of red drum, Sciaenops ocellatus, phosphorylated histone H1 protein and a Cdk-specific peptide substrate. Kinetic analyses demonstrated that apparent K m values of red drum MPF for adenosine triphosphate and the peptide substrate were 98.3 and 18.2 μM, respectively. A simple growth experiment showed that MPF activity was significantly greater in rapidly growing red drum larvae than in intermittently fed cohorts growing more slowly.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/PL00011779
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