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  • 1
    Electronic Resource
    Electronic Resource
    Intracellular levels of polyadenylated RNA and loss of vigour in germinating wheat embryos (1982)
    Springer
    Planta 156 (1982), S. 413-420 
    Details
    ISSN: 1432-2048
    Keywords: Embryo vigour ; Germination (embryo) ; Poly(A) RNA ; Vigour (seed) ; Triticum (seed vigour)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Polyadenylated-RNA (Poly(A)+RNA) levels have been studied during the germination of wheat embryos of high viability but differing vigour. In high-vigour embryos imbibed at 20°C the level of poly(A)+RNA falls dramatically over the first hour of imbibition, then remains constant up to 3 h of imbibition before increasing rapidly to a level similar to that found in the quiescent state by 7 h of imbibition. Median-vigour embryos imbibed at 20°C show similar changes in poly(A)+RNA content but the initial decrease and subsequent increase in poly(A)+RNA levels are less marked. On imbibition at 10°C, the poly(A)+RNA content in high-vigour embryos decreases to a lesser extent during the first hour than at 20°C and the level increases more slowly over the next 6 h than during the same time period at 20°C. The level of poly(A)+RNA in medianvigour embryos remains constant over the first 4 h of germination and then falls to a level of about half that found in quiescent high-vigour embryos. Polyacrylamide gel electrophoresis of total-RNA samples shows that the polyadenylic acid (poly(A)) sequences occur in RNA species ranging in size from 35-7S. Polyacrylamide gel electrophoresis of isolated poly(A) sequences demonstrates the presence of two size classes of poly(A) in quiescent embryos, but at 20°C a more heterodisperse pattern appears by 2 h of imbibition. At 10°C, two size classes of poly(A) persist throughout the period studied in both high- and median-vigour embryos, although in median-vigour embryos the ratio of larger: smaller poly(A)-tail sizes decreases more rapidly than in high-vigour embryos.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00393312
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Crosslinking and scission yields for polystyrene subjected to γ irradiation in vacuo (1979)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 17 (1979), S. 4081-4088 
    Details
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Measurements of molecular weight averages and distributions have been made on three samples of narrow molecular size distribution polystyrene with molecular weights from 100, 000 to 400, 000 subjected to 60Co γ irradiation in vacuo for various doses within the pregel region+ G(X), the radiation chemical yield of crosslinking, has been determined as 0.043 ± 0.002 and G(S)/G(X), the ratio of scission to crosslinking, as 0.02; no effect of molecular weight was observed. By comparison with previous experimental results for polystyrene irradiated in air it has been established unequivocally that an oxygen environment leads to enhanced scission at the expense of crosslinking. Literature values of G(X) and G(S)/G(X) are reviewed in the light of these results and explanations are offered to account for major discrepancies.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1979.170171227
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  • 3
    Electronic Resource
    Electronic Resource
    Evaluation of radiation chemical yields from the reciprocal relationship between irradiation dose and weight-average molecular weight (1978)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Physics Edition 16 (1978), S. 1515-1518 
    Details
    ISSN: 0098-1273
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1978.180160816
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    Paper (German National Licenses)
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