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  • 1990-1994  (5)
  • 1991  (5)
  • 1
    Electronic Resource
    Electronic Resource
    Genetic Analysis of Resistance to Phytophthora Root Rot in Tomato (Lycopersicon esculentum Mill.) (1991)
    Oxford, UK : Blackwell Publishing Ltd
    Plant breeding 106 (1991), S. 0 
    Details
    ISSN: 1439-0523
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: The resistant accession, LA1312, and the susceptible cultivar ‘Peto 343′, were crossed to develop F1, F2 and BC1 populations for genetic analysis of resistance in tomatoes to Phytophthora parasitica Dastur, the causal agent of Phytophthora root rot. There was no maternal effect on resistance. Generation means analysis indicated that tolerance to Phytophthora root rot was under genetic control with both simple (additive and dominance) and digenic interaction (additive × additive and additive × dominance) effects contributing to the total genetic variation among generation means. Weighted least square regression analysis indicated that the majority (ca. 96 %) of the genetic variation could be explained by simple additive effects alone. Narrow sense heritability was estimated as 0.22. Based on effective factor formulae, at least five effective factors controlled the resistance. Implications for breeding procedures are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1439-0523.1991.tb00475.x
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Determination of the concentration profile at the surface of deuterated polystyrene/hydrogenated polystyrene blends using high-resolution ion scattering techniques (1991)
    s.l. : American Chemical Society
    Macromolecules 24 (1991), S. 5991-5996 
    Details
    ISSN: 1520-5835
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ma00022a014
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Synthesis and structure of the first base-free diphosphadigalletane (1991)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 113 (1991), S. 7050-7052 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja00018a061
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    The MHC Class I Associated Beta2-microglobulin (β2m) Light Chain is Expressed in a Molar Excess Over HLA-ABC and CD1 on the Membrane of Leukaemic B Cells but not Leukaemic T Cells: Evidence for Further β2m-Associated Molecules (1991)
    Oxford, UK : Blackwell Publishing Ltd
    Scandinavian journal of immunology 34 (1991), S. 0 
    Details
    ISSN: 1365-3083
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Beta2-microglobulin (β2m) constitutes the common light chain of both the MHC-encoded HLA-ABC molecules and a group of structurally related glycoproteins recognized by antibodies of the first cluster of differentiation (CD1a, CD1b and CD1c). These CD1 antigens appear similar to murine T1 and Qa molecules in terms of structure and tissue distribution, although the question of inter-species homology is controversial. A further group of alloantigens expressed predominantly on T cells has been reported however, with immunogenetic characteristics more closely analogous to the murine T1/Qa system than the CD1 antigens, although their precise identity remains ill-defined. Having previously shown that malignant B cells may express membrane CD1c, we examined leukaemic B-cells corresponding to early lymphoblastic differentiation (null-and common acute lymphoblastic leukaemia) through to the terminal plasma cell stage for the expression of other non-HLA class I β2m -associated molecules. It was found that leukaemic B-cells at intermediate/late stages of differentiation, represented by non-Hodgkin's lymphoma (B-NHL) and‘hairy-cell’leukaemia (HCL), had significantly higher β2m: HLA-ABC ratios than did the cells from other types of B-cell malignancy. Although leukaemic B cells with a demonstrable non HLA-ABC- associated β2m component expressed detectable levels of CD1c. and insignificant levels of CD 1a and CD 1b, the antigen density was insufficient to account for the excess β2m. In vitro stimulation of leukaemic B cells by phorbol ester substantially increased the expression of HLA-ABC and CD1c, but also accentuated further the difference between the expression of these molecules and that of β2m. There was no detectable β2m other than that associated with HLA-ABC and CD1 on the surface of malignant T cells by contrast. Our findings strongly support the existence, at certain stages of leukaemic B-cell differentiation, of an additional β2m component(s) other than that associated with HLA-ABC and CD1.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3083.1991.tb01520.x
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Genetic analysis of salt tolerance during germination in Lycopersicon (1991)
    Springer
    Theoretical and applied genetics 81 (1991), S. 321-326 
    Details
    ISSN: 1432-2242
    Keywords: Lycopersicon esculentum ; Salt tolerance ; Seed germination ; Maternal effects ; Tomato improvement ; Gene action
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The salt-tolerant cultivated tomato (Lycopersicon esculentum) accession, ‘PI174263’, and a sensitive cv, ‘UCT5’, were crossed to develop reciprocal F1, F2 and BC1 populations for genetic analysis of salt tolerance in tomatoes during seed germination. Variation was partitioned into embryo, endosperm and maternal (testa and cytoplasmic) components. Generation means analysis indicated that there were no significant embryo (additive, dominance or epistatic) effects on germination performance under salt stress. Highly significant endosperm additive and testa dominance effects were detected. The proportion of the total variance explained by the model containing these two components was R2=98.2%. Variance component analysis indicated a large genetic variance with additive gene action as the predominant component. Furhter inspection indicated that this variance was attributable to endosperm additive effects on germinability under salt stress. Narrow-sense heritability was estimated as moderately high. Implications for breeding procedures are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00228671
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    Paper (German National Licenses)
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