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  • 1985-1989  (1)
  • 1975-1979  (2)
  • 1920-1924
  • Analytical Chemistry and Spectroscopy  (1)
  • Cell cycle  (1)
  • Disease resistance  (1)
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Material
Years
  • 1985-1989  (1)
  • 1975-1979  (2)
  • 1920-1924
  • 1990-1994  (1)
Year
Keywords
  • 1
    Electronic Resource
    Electronic Resource
    Development of the quiescent center in maturing embryonic radicles of pea (Pisum sativum L. cv. Alaska) (1977)
    Springer
    Planta 135 (1977), S. 233-240 
    Details
    ISSN: 1432-2048
    Keywords: Cell cycle ; DNA synthesis ; Embryo ; Pisum ; Quiescent center ; Root (radicle)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Maturing embryos of pea (Pisum sativum L. cv. Alaska) were treated with an aqueous solution of tritiated thymidine for 1 h, sectioned, and processed for autoradiography. An analysis of the distribution of labelled nuclei and mitotic figures demonstrated the presence of a quiescent center (QC) in the radicles of developing embryos. The QC developed in the radicle during the growth of the embryo. Immature radicles that did not contain a well-formed zone of root-cap initials did not show a QC. In the latter stages of seed ripening, the pattern of arrest of DNA synthesis and mitosis was tissue-specific. Cells within the QC remained inactive. The region lacking labelled nuclei and mitotic figures progressively expanded to include the root cap initials and then the provascular cylinder. Mitosis was arrested before DNA synthesis in the embryonic cortex. Cells within the QC synthesized DNA during the first stages of seed germination.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00384895
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Nuclear and cytoplasmic gene control of resistance to loose smut (Ustilago tritici (Pers.) Rostr.) in wheat (Triticum aestivum L.) (1989)
    Springer
    Theoretical and applied genetics 78 (1989), S. 897-903 
    Details
    ISSN: 1432-2242
    Keywords: Triticum ; Ustilago tritici ; Chromosome substitution lines ; Nuclear-cytoplasmic interactions ; Disease resistance
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Using disomic chromosome substitution lines based on the susceptible wheat cultivar ‘Chinese Spring’, loose smut resistance of wheat cultivars ‘Hope’ and ‘Thatcher’ was shown to be conferred in each case by a single dominant major gene carried on chromosome 7 A (‘Hope’) or 7 B (‘Thatcher’). Partial resistance was determined by genes on an additional eight ‘Hope’ or seven ‘Thatcher’ chromosomes, and similarities were evident between the partial resistance genotypes of‘Hope’ and ‘Thatcher’. ‘Chinese Spring’ exhibited a mean infection value of approximately 50%, indicating a significant level of partial resistance, which was found to be due, in part, to genes on the homoeologous chromosome arms 1 As, 1 Es and 1 Ds, and to cytoplasmic genes. Substitution of the ‘Chinese Spring’ nucleus into the cytoplasm of Aegilops squarrosa, Ae. variabilis or Ae. mutica resulted in increased susceptibility to Ustilago tritici. Several alloplasmic lines of the resistant wheat cultivars ‘Selkirk’ and ‘Chris’ exhibited race-specific susceptibility to U. tritici.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00266678
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Raman and IR spectra of matrix isolated OsO3F2 AND OsO4: The molecular shape of monomeric OsO3F2 (1976)
    Chichester [u.a.] : Wiley-Blackwell
    Journal of Raman Spectroscopy 4 (1976), S. 313-322 
    Details
    ISSN: 0377-0486
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: This paper reports fundamental vibration frequencies for molecular OsO3F2 and OsO4 isolated in argon matrices at low temperatures. OsO3F2 is shown to have D3h symmetry on the basis of Raman and IR selection rules, and this conclusion is confirmed by the results of 18O enrichment studies which demonstrate the presence of an OsO3 unit containing three equivalent oxygens. The argon matrix frequencies are 946.5 (A′1), 928.5 (E′), 646 (A′2), 619 (A′/1) 348 (E″), 316.5 (E′) 258 (A″2) and 206 (E′) cm-1. High resolution spectra are also reported for matrix isolated Os16O4 (ν1 963, ν2 332, ν3 956, and ν4 327 cm-1) and for 18O enriched OsO4 species.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jrs.1250040313
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    Paper (German National Licenses)
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