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  • 1965-1969  (26)
  • 1955-1959  (13)
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  • 1
    Electronic Resource
    Electronic Resource
    The synthesis of 6'-deoxyhomonucleoside 6'-phosphonic acids (1968)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 90 (1968), S. 5337-5338 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja01021a086
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The control of chiasma distribution in rye (1967)
    Springer
    Chromosoma 22 (1967), S. 69-90 
    Details
    ISSN: 1432-0886
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract The chiasma conditions have been extensively analysed in two contrasting rye genotypes, one showing a normal and regular pattern of chiasma distribution and the other showing a highly abnormal and asymmetrical pattern of chiasma distribution. The analyses show that the pattern of chiasma distribution in the abnormal genotype conforms to the statistical expectations of randomness, and this is interpreted as being due to a breakdown of the processes which govern the distribution of chiasmata in normal rye genotypes. On the basis of these findings it is proposed that two independent and fundamentally different control systems are involved in the maintenance of efficient chiasma conditions in rye. One of these controls simply gives competence for chiasma formation, the other control system is evidently concerned with regulating the distribution of chiasmata. Analysis of two trisomic genotypes reveals that the conclusions relating to large samples of bivalents are also applicable to particular identifiable chromosomes. The results of brceding tests involving the two contrasting genotypes show that the control of chiasma distribution in rye has a complex genetic basis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00291287
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Further correlations between chiasmata and U-type exchanges in rye meiosis (1969)
    Springer
    Chromosoma 26 (1969), S. 105-118 
    Details
    ISSN: 1432-0886
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Earlier studies have demonstrated convincing correlations between the distribution patterns of chiasmata and of U-type exchanges within bivalents. On the basis of this evidence and other considerations it has been proposed that these contrasting meiotic exchange events are related in origin, and that U-type exchanges, giving rise to bridge and fragment configurations, arise as errors in crossing-over and chiasma formation. This hypothesis is given further consideration in the present report and further correlated distributions of chiasmata and U-type exchanges are presented. These correlations involve the distribution patterns of exchanges between bivalents and between the two arns of one particular bivalent which is consistently marked by the presence of localised neocentric activity. The relationships of these exchange distributions to chromosome length are also investigated and as a result it becomes clear that a mutual dependence of the two types of exchange on chromosome length cannot account for the observed correlations. The total evidence relating to the hypothesis of a causal connection between chiasmata and U-type exchanges is reviewed and critically assessed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00319501
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Utilization of Thiocyanate by Thiobacillus thioparus and T. thiocyanoxidans (1958)
    [s.l.] : Nature Publishing Group
    Nature 182 (1958), S. 266-267 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] De Kruyff, van der Walt and Schwartz1 have shown the capacity not only of T. thioparus but also of T. denitrificans to break down thiocyanates both aerobically and anaerobically in the presence of nitrate. They suggest that T. thioparus and T. thiocyanoxidans are one and the same organism; and with ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/182266a0
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Density and Expansivity of Solid Argon (1956)
    [s.l.] : Nature Publishing Group
    Nature 178 (1956), S. 483-483 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] For various reasons, argon is the most suitable substance for such a study; but until recently only one of the three coefficients, Cp, has been known accurately for the solid8. Last year, Stewart4 determined the isothermal compressibility (XT) at 65 and 77 K. and Barker and Dobbs5, in this ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/178483a0
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Spectrophotometric Determination of Vanadium in Plant Materials (1959)
    s.l. : American Chemical Society
    Analytical chemistry 31 (1959), S. 1344-1347 
    Details
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ac60152a029
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Nuclear Variation between Diploid Angiosperms (1966)
    [s.l.] : Nature Publishing Group
    Nature 211 (1966), S. 828-830 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] EXTENSIVE polyploid series in many plant genera, particularly in Angiosperms, testify to the prominence and importance of quantitative variation in nuclear genetic material during the evolution and divergence of numerous species. In sharp contrast, but not uncommonly, are other plant genera which ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/211828a0
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    Rotation of Imidazole in the Solid State and its Significance in deciding the Nature of Charge Migration in Biological Materials (1968)
    [s.l.] : Nature Publishing Group
    Nature 218 (1968), S. 672-673 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] To maintain a net flow of charge along the direction of the electric field, it is usually necessary for individual molecules, after they have transferred a proton, to undergo rotation so as to be suitably disposed for the next proton to be accepted. Fig. 1, which is based on a notion first ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/218672a0
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    Paper (German National Licenses)
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  • 9
    Electronic Resource
    Electronic Resource
    Microstructure of High Strength, High Modulus Carbon Fibres (1967)
    [s.l.] : Nature Publishing Group
    Nature 215 (1967), S. 386-387 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] X-ray diffraction photographs (Fig. 1) taken of bundles of these fibres suggest that they consist of graphite crystallites about 50 Å in size calculated from the line breadth of the (002) reflexion using the Scherrer equation and that the basal planes are highly oriented along the fibre axis, ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/215386a0
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    Paper (German National Licenses)
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  • 10
    Electronic Resource
    Electronic Resource
    Analysis of Meiotic Exchange by Tritium Autoradiography (1969)
    [s.l.] : Nature Publishing Group
    Nature 223 (1969), S. 946-947 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Young male imagines of Schistocerca gre-garia were given a single injection containing 20 ^Ci of 3H-thymidine in a volume of 0-05 ml., then maintained in an insect cage at approximately 32 C while individual insects were sampled at half-day intervals and their testes dissected and fixed. Feulgen ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/223946a0
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    Paper (German National Licenses)
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