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  • 1
    Electronic Resource
    Electronic Resource
    Marker-assisted backcross introgression of the Yd2 gene conferring resistance to barley yellow dwarf virus in barley (2003)
    Oxford, UK : Blackwell Publishing Ltd
    Plant breeding 122 (2003), S. 0 
    Details
    ISSN: 1439-0523
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: YLM, a codaominant polymerase chain reaction (PCR) marker linked to Yd2, could substantially improve the precision and efficiency of barley yellow dwarf virus (BYDV) resistance breeding. The aim of this study was to assess the effectiveness of YLM in a marker-assisted introgression programme and to quantify associations between the presence of Yd2 and other agronomic and quality traits. The Yd2 gene was introgressed into a BYDV-susceptible background through two cycles of marker-assisted backcrossing. BC2 F2-derived lines, either carrying or not carrying the YLM allele associated with resistance, were compared in the presence and absence of BYDV. The YLM marker was shown to be effective in the introgression of Yd2. Lines carrying the YLM allele associated with resistance produced significantly fewer leaf symptoms and showed a reduction in yield loss when infected with BYDV. There were no deleterious effects associated with the introgression of Yd2 on grain yield, grain size or malting quality. The implications of marker-assisted selection for Yd2 on barley improvement are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1439-0523.2003.00752.x
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  • 2
    Electronic Resource
    Electronic Resource
    Four Isomeric Dioxolane Derivatives of D-Camphorquinone (1995)
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 51 (1995), S. 1825-1829 
    Details
    ISSN: 1600-5759
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108270195001788
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  • 3
    Electronic Resource
    Electronic Resource
    Determination of the strange quark content of the nucleon from a next-to-leading-order QCD analysis of neutrino charm production (1995)
    Springer
    The European physical journal 65 (1995), S. 189-198 
    Details
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We present the first next-to-leading-order QCD analysis of neutrino charm production, using a sample of 6090ν μ − and $$\bar \nu _\mu $$ -induced opposite-sign dimuon events observed in the CCFR detector at the Fermilab Tevatron. We find that the nucleon strange quark content is suppressed with respect to the non-strange sea quarks by a factor κ=0.477 −0.053 +0.063 , where the error includes statistical, systematic and QCD scale uncertainties. In contrast to previous leading order analyses, we find that the strange seax-dependence is similar to that of the non-strange sea, and that the measured charm quark mass,m c =1.70±0.19 GeV/c2, is larger and consistent with that determined in other processes. Further analysis finds that the difference inx-distributions betweenxs(x) and $$x\bar s{\text{(}}x{\text{)}}$$ is small. A measurement of the Cabibbo-Kobayashi-Maskawa matrix element |V cd |=0.232 −0.020 +0.018 is also presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01571875
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  • 4
    Electronic Resource
    Electronic Resource
    Identification of triploid Citrus by isozyme analysis (1996)
    Springer
    Euphytica 90 (1996), S. 223-231 
    Details
    ISSN: 1573-5060
    Keywords: Citrus ; digital densitometry ; isozymes ; triploids
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Seedlessness is a desirable horticultural attribute in Citrus and is positively associated with triploidy. The conventional cytological method for triploid identification is a laborious technique involving the preparation of root tips for chromosomal analysis. Digital densitometry of isozymes, however, offers the possibility of distinguishing triploid Citrus from large populations of seedlings both quickly and cheaply. Where there are no gene dosage regulation effects, greater band density should be evident in the allozyme contributed by the diploid gamete for a heterozygous locus. The isozymes of 4 enzymes; malate dehydrogenase, 6-phosphogluconate dehydrogenase, shikimate dehydrogenase, and phosphoglucose isomerase, were investigated with polyacrylamide gel electrophoresis. Band densities of these isozymes for triploid Citrus, their diploid siblings and diploid progenitors were measured using a digital densitometer. Of the 4 enzymes investigated only allozymes for shikimate dehydrogenase exhibited consistent differences over a wide range of Citrus cultivars. Greater band density was evident in the allozyme contributed by the diploid gamete. The band density ratio between allozymes for triploid Citrus was close to 0.5, while for diploid Citrus band density ratios were close to 1.0. This effect is due to the extra protein coded by the additional gene dose and was not observed in diploids. Shikimate dehydrogenase proved to be an accurate molecular marker for distinguishing between diploid and triploid Citrus for heterozygous progeny.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00023862
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  • 5
    Electronic Resource
    Electronic Resource
    Extractive foraging and the evolution of primate intelligence (1986)
    Springer
    Human evolution 1 (1986), S. 361-372 
    Details
    ISSN: 1824-310X
    Keywords: extractive foraging ; primate intelligence ; cognition ; hominoid evolution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract One of the two major theories regarding the evolution of intelligence in primates is that feeding strategies determine mental development. Evidence for this theory is reviewed and related to extractive foraging, which is the act of locating and/or processing embedded foods such as underground roots and insects or hard-shelled nuts and fruits. It is shown that, although only cebus monkeys and chimpanzees in the wild use tools in extractive foraging, many other species of mammals (including primates) and birds are capable of extracting embedded foods without tools. Extractive foraging by primates is compared to extractive foraging by other mammals and birds to assess whether: 1) extractive foraging involves cognition, and 2) extractive foraging by primates is unique in a way that may mean it played a role in the development of intelligence among primates. This comparison reveals that some acts of extractive foraging by nonprimates are equally sophisticated as those of primates. It is suggested that extractive foraging played no significant role in the evolution of primate intelligence. Hypotheses for testing precise differences in extractive foraging ability across taxa are offered, and the roles of olfactory cues, manual dexterity, and strength in extractive foraging are evaluated. In conclusion, the hominization process is briefly reviewed in relation to foraging behavior. A «package» of traits that, in combination, is unique to hominids is discussed: tool-aided extractive foraging, division of labor by sex with food exchange, and feeding of juveniles.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02436709
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    Paper (German National Licenses)
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