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  • Genetik  (1)
  • separation  (1)
  • Springer  (2)
  • 1990-1994  (2)
  • 1965-1969
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Verlag/Herausgeber
  • Springer  (2)
Erscheinungszeitraum
  • 1990-1994  (2)
  • 1965-1969
Jahr
  • 1
    ISSN: 1871-4528
    Schlagwort(e): Nematodenresistenz ; Sortenkreuzungen ; Spaltungszahlen ; Genetik
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Beschreibung / Inhaltsverzeichnis: Summary The inheritance of resistance toGlobodera rostochiensis pathotype Ro1 was studied in progenies of 10 selected cultivars which had resistance to different pathotypes, stemming from several wild species. Progenies of all the cultivars were produced by crossing with a susceptible cultivar, and several random samples from each combination, usually progeny from a single berry, were tested for their resistance to pathotype Ro1. The cultivars could be separated into genotypic groups, according to the proportion of resistant progeny in each combination. Cultivars which did not differ significantly in the split of resistant and susceptible progenies, but were clearly different from other groups, were put in the same group. The number of groups which could be differentiated was not consistent with the theoretically possible genotype, simplex ... quadruplex, arising from the inheritance of the gene H1. Greater genetic variation could be detected involving more than 4 genotypic groups. The results suggest the existence of another genetical mechanism. The number of groups and their reproducibility requires further investigation. It will therefore be necessary to test several different random samples to characterise a single combination.
    Notizen: Zusammenfassung 10 nematodenresistente Sorten wurden mit einem anfälligen Elter gekreuzt und die daraus erzeugten Nachkommenschaften auf Resistenz gegen Pathotyp Ro 1 des Kartoffelnematoden geprüft. Die Prüfung erfolgte an Sämlingen und Klonen, die sich aus mehreren Stichproben einer Kombination, einschliesslich der Prüfung von Nachkommen aus Einzelbeeren, zusammensetzten. Entsprechend dem Anteil resistenter Nachkommen in den einzelnen Kombinationen können die Sorten in genotypische Gruppen eingeteilt werden. Im Gegensatz zu den simplex ... quadruplex Genotypen der Gen H1-Vererbung konnte eine höhere genetische Variabilität nachgewiesen werden. Eine Beurteilung der Anzahl der genetischen Faktoren, die die Vererbung der Resistenz gegen Pathotyp Ro 1 beeinflussen, kann erst nach Prüfung weiterer Kreuzungsnachkommenschaften erfolgen.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Springer
    Colloid & polymer science 271 (1993), S. 133-142 
    ISSN: 1435-1536
    Schlagwort(e): Graft copolymer ; separation ; ultracentrifugation ; fractional demixing with demixing solvents
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie , Maschinenbau
    Notizen: Abstract In the final product of a bimodal bigraft ABS, consisting of crosslinked polybutadiene particles (diameter 100 nm) with grafted and ungrafted poly (styrene-co-acrylonitrile) (=SAN) with an acrylonitrile (=AN) content of 28 weight %, crosslinked polybutadiene particles (diameter 300 nm) with grafted and ungrafted SAN with an AN content of 12 weight % and an added SAN with an AN content of 28 weight % the following parameters can be determined: degree of grafting of the small polybutadiene particles, degree of grafting of the large polybutadiene particles, acrylonitrile content of the grafted chains of the small polybutadiene particles, acrylonitrile content of the grafted chains of the large polybutadiene particles, grafting efficiency of the large particles, average particle diameter and particle diameter distribution of the small particles, average particle diameter and particle diameter distribution of the big particles, molar mass distribution of the ungrafted chains of the large particles, chemical distribution of the ungraftd chains of the large particles, molar mass distribution of the SAN resin added, chemical distribution of the SAN resin added. Preparative differential ultracentrifugation in acetone/γ-butyrolacrone (volume ratio 0.55∶0.45), FTIR spectrometry and electron microscopy of the floating and sedimentating fraction yield the degree of grafting and AN content of the graft chains of the large particles and the degree of grafting and AN content of the graft chains of the small particles. Preparative differential centrifugation, FTIR spectrometry and electron microscopy of the fractions give nearly equivalent results. Fractional demixing with the demixing solvents ethylene carbonate/tetraline of the acetone-soluble part yields the SAN with 12 weight % AN in the upper-phase and the SAN with 28 weight % AN in the lower phase. Size exclusion chromatography (SEC) and high-performance precipitation liquid chromatography (HPPLC) of the fractions yield the molecular distribution and chemical distribution of the different SAN resins. SEC, coupled with turbidimetric titration of the acetone-soluble fractions withn-hexane as precipirant, indicates SAN resin with lower AN content in addition to the SAN resin with 28 weight % AN.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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