Library

feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
  • 1970-1974  (2)
  • 1960-1964  (3)
  • 1
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Analytical chemistry 33 (1961), S. 1112-1113 
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Theoretical and applied genetics 45 (1974), S. 117-121 
    ISSN: 1432-2242
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Zusammenfassung Als Material für die vorstehenden Untersuchungen wurden die kleinkörnige Leinsorte Redwing, die großkörnige Beta 210 und ihre reziproken Kreuzungen und Rückkreuzungen verwendet. Die Mittelwerte des Samengewichtes (in mg/Samen) der reziproken Kreuzungen waren in der F1 gleich, unterschieden sich jedoch in der F2 und F3, ebenso wie in den reziproken Rückkreuzungen, signifikant voneinander und zeigten damit eine Ungleichwertigkeit hinsichtlich dieses Merkmals auf. Ausgehend von der Annahme, daß Redwing und Beta 210 unterschiedliche Plasmotypen besitzen und der Bastard im Plasmotyp dem mütterlichen Elter entspricht, wurden die verfügbaren 24 Familien einschließlich der Selbstungen der Eltern in zwei genomatisch gleiche, jedoch plasmatisch unterschiedliche Gruppen klassifiziert. Eine detaillierte Analyse der Familienmittel innerhalb der Gruppen führt zu dem Schluß, daß die Vererbung des betrachteten Merkmals verhältnismäßig kompliziert ist. In der F1 war die Menge der Beta 210-Gene über die allele Menge der Redwing-Gene partiell dominant ([h]〈[d]). In den folgenden Generationen erleidet die Menge der Beta 210-Gene eine gewisse Einbuße an Expressivität. Dieser Verlust beträgt 73% in den Familien des Plasmotyps Redwing und 20% in den Familien des Plasmotyps Beta 210. Dieser Unterschied im Verlust der Expressivität und die Dosiseffekte, die vornehmlich in den Familien mit dem Plasmotyp Beta 210 nachgewiesen werden, zeigen, daß die Ursache der Ungleichwertigkeit der reziproken Kreuzungen sowohl plasmatisch als auch kernbedingt ist.
    Notes: Summary Materials used in this study consisted of small and large seeded flax varieties Redwing and Beta 210, and of their reciprocal crosses and backcrosses. The seed weight means (mg's/seed) of reciprocal crosses were the same in F1 but significantly different in F2 and F3 generations indicating thus their nonequivalence with respect to this character. This nonequivalence was detectable also in the backcross reciprocals. On the assumption that Redwing and Beta 210. have different plasmatypes and the hybrid has the same plasmatype as its female parent, the available 24 families, including the parents as selfs, were grouped into two genomically the same but plasmatically supposedly different sets. A detailed analysis of the family means in these two sets led to the conclusion that the inheritance of the character considered was rather complicated. In F1 generation the Beta 210 set of genes was partially dominant over its allelic Redwing set ([h]〈[d]). In the subsequent generations the Beta 210 set of genes has sustained a certain degree of loss of expressivity. This loss was 73% in the plasmatypically Redwing set of families and 20% in the plasmatypically Beta 210 set of families. This difference in the loss of expressivity and the gene-dosis effects, detected mainly in the plasmatypically Beta 210 set of families, indicated that the nature of the reciprocal cross nonequivalence observed in this study was both cytoplasmic and nuclear.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Biochemical genetics 11 (1974), S. 103-119 
    ISSN: 1573-4927
    Keywords: host-parasite interaction ; flax ; rust ; genetic control ; resistance
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract The nature of resistance to rust fungus Melampsora lini (Pers.) Lev. was studied in two near-isogenic lines of flax, the susceptible Redwing (rr) and the immune S-66-53 (RR). Proteins of theses lines were immunologically and electrophoretically similar. Hydrolytic enzymes which release phenolic moities, i.e., β-glucosidase and esterase(s), and phenol-oxidizing enzymes, i.e., peroxidase and polyphenol oxidase(s), did not appear to be involved in resistance or susceptibility as controlled by the R locus. Catalase activity was found to be higher in younger tissues of Redwing than in S-66-53 or their immune F1 hybrid (Rr). Older tissues in both lines, whether inoculated or not, did not show any detectable catalase activity. A hypothesis to explain the genetic control of resistance and susceptibility in these lines before and after inoculation is suggested.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 4
    Electronic Resource
    Electronic Resource
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 48 (1960), S. 17-25 
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Promoted preformed solids catalyze polymerization of ethylene and propylene and formation of copolymers of ethylene with such olefins as propylene and butene-1. The structure of the copolymers helps explain how they are formed and their properties. Kinetic studies alone do not distinguish between polymerization mechanisms involving either anionic centers or ion-radicals. Structural studies of ethylene-propylene copolymers of low propylene content show that they contain isolated propylene units in accord with the ion-radical theory of polymerization in a chemisorbed layer. Isolated short sidechains, so introduced, reduce density and increase flexibility. They give copolymers with flow properties more like those of linear polyethylenes than those of branched polyethylenes with long sidechains. Furthermore, they interfere with recrystallization and crystal growth; the resulting polymers have better stress-crack resistance and form clearer films.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 5
    Electronic Resource
    Electronic Resource
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 61 (1962), S. 39-44 
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Copolymers of ethylene and C14-labeled propylene were prepared with a metal-oxide catalyst which polymerizes ethylene to a high density polymer. Methyl branches arising from the propylene were counted radiochemically and then related to the infrared absorption of films at 8.7 μ. This band was then used independently to determine methyl branching of a series of ethylene-propylene copolymers that differed in density and stiffness. Both properties decrease in value with an increase in branching.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...