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  • 1
    Electronic Resource
    Electronic Resource
    Ribosomal RNA cistron number in a polyploid series of plants (1974)
    Springer
    Chromosoma 46 (1974), S. 23-28 
    Details
    ISSN: 1432-0886
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract A comparison has been made of the amount of DNA coding for ribosomal RNA present in a polyploid series of plants of Datura innoxia. The plants which were produced by in vitro culture of pollen grains were haploid, diploid, triploid, tetraploid and hexaploid. In all instances there was a similar proportion of DNA coding for ribosomal RNA. The implications of these results are discussed, and the data compared with that available from other series of plants of different DNA content or ploidy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00332336
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  • 2
    Electronic Resource
    Electronic Resource
    Artificial Mutagenesis in Plant Breeding (1958)
    [s.l.] : Nature Publishing Group
    Nature 182 (1958), S. 955-956 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] We have recently attempted to induce in Hordeum sativum (variety Proctor) mutants resistant to Erysiphe graminis f. hordeii, and our results have indicated a still further source of uncertainty in mutation breeding. Dormant seeds (water content 10.6 per cent) were exposed to either 10,000 rads of ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/182955a0
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  • 3
    Electronic Resource
    Electronic Resource
    Separation by Gamma-Irradiation of Two Elements at the V by Locus in Trifolium repens (1959)
    [s.l.] : Nature Publishing Group
    Nature 184 (1959), S. 1957-1958 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Fig. 1. Leaves of T. repens. a, Normal; 6, yellow tip phenotype; c, white V phenotype Two clones heterozygous for F6^ and v were utilized in a series of experiments to determine the dose response to gamma-radiation, in terms of induced mutations at this locus, to examine the effect of dose-rate ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/1841957b0
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  • 4
    Electronic Resource
    Electronic Resource
    Age and Gender Differences in Perceived Accident Likelihood and Driver Competences (1996)
    Oxford, UK : Blackwell Publishing Ltd
    Risk analysis 16 (1996), S. 0 
    Details
    ISSN: 1539-6924
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Road traffic accident involvement rates show clear age and gender differences which may in part be accounted for by differences in risk perception and perceptions of driving competence. The present study extends and replicates that of Matthews and Moran (1986). Young (18–30 years) and older (45–60 years) male and female drivers responded to a questionnaire on perceived accident risk and driving competence (judgment and skill) with respect to themselves and four target groups, and also rated a series of videotaped driving sequences with respect to likelihood of accident occurrence and perceived driving competence. Results showed that effects of rater characteristics were generally confined to the questionnaire. Younger males were perceived as most likely to experience an accident and were judged to be lower than other groups in driving competence. Younger groups showed little bias against older groups and vice versa, but gender-related bias was apparent. The findings of Matthews and Moran were generally confirmed. The results are discussed with reference to four main issues: (1) demographic bias effects—which are generally weak; (2) stereotyping on the basis of gender and/or age of driver; (3) group-specific bias; (4) self-appraisal bias.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1539-6924.1996.tb00826.x
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  • 5
    Electronic Resource
    Electronic Resource
    Effect of gamma radiation on interspecific incompatibility within the genusBrassica (1960)
    Springer
    Molecular genetics and genomics 91 (1960), S. 45-51 
    Details
    ISSN: 1617-4623
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary 1. An attempt has been made to exploit the destructive properties of ionising radiations in overcoming the barriers to hybridisation that exist betweenBrassica oleracea, B. campestris andB. nigra. 2. One series of crosses involvingB. oleracea x B. nigra was successful only after irradiating the gametes or stylar tissues prior to crossing. After exposing female gametes, triploid, and after exposing male gametes, diploid progeny were produced. 3. An explanation of these results is sought in terms of a change in the relationship of embryo and maternal or endosperm tissues.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00889997
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  • 6
    Electronic Resource
    Electronic Resource
    The comparative effects of a mono- and a bi-functional alkylating agent on recombination inChlamydomonas reinhardi (1966)
    Springer
    Molecular genetics and genomics 98 (1966), S. 61-70 
    Details
    ISSN: 1617-4623
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Synchronous populations of diploid cells ofChlamydomonas reinhardi were exposed to a bifunctional (Nitrogen Mustard) and a monofunctional (Diethyl Sulphate) alkylating agent at various stages of the pre-meiotic interphase and meiosis, and the effect on recombination in the arg 1/pab 2 region of linkage group I assessed. Both compounds affected recombination—the monofunctional one depressing it during two short periods, one just pre-meiosis when the main DNA duplication for meiosis is thought to occur, and the other in early prophase. The bifunctional compound on the other hand depressed recombination over an extended period. These effects have been related to the ability of the agents used to affect DNA synthesis and the different temporal patterns of response interpreted in terms of differential repair activities. The results provide additional evidence of the existence of two periods during which recombination can be affected.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00898297
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  • 7
    Electronic Resource
    Electronic Resource
    Single Cell Protein and the Exploitation of Mutant Algae lacking Cell Walls (1971)
    [s.l.] : Nature Publishing Group
    Nature 233 (1971), S. 143-144 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Fig. 1 Longitudinal section of (a) a wild type cell, (b) a mutant CW15, lacking a cell wall. Note cell is bound only by a plasma membrane. (Electron micro- graph x 7,200.) Table 1 Amino-acid Composition of Wild Type Cells and of a Mutant Strain CW15 Lacking Cell Walls Amino-acid mg in WT ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/233143a0
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  • 8
    Electronic Resource
    Electronic Resource
    Absence of an Oxygen Effect and the Genetically Determined Repair Processes (1967)
    [s.l.] : Nature Publishing Group
    Nature 215 (1967), S. 829-832 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Certain mutants are more sensitive to γ-irradiation in the absence of oxygen than in its presence. This unusual effect is controlled by one ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/215829a0
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  • 9
    Electronic Resource
    Electronic Resource
    Detection of legumin gene DNA sequences in pea by in situ hybridization (1988)
    Springer
    Chromosoma 96 (1988), S. 454-458 
    Details
    ISSN: 1432-0886
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract In order to detect low copy number sequences in pea using biotin-labelled probes we optimised some aspects of the in situ hybridization technique. We found protoplast preparations to be superior to standard squashes in terms of their signal: noise ratio. Heat and alkali denaturation of chromosomal DNA were both more effective than acid denaturation. A comparison of antibody-fluorochrome and streptavidin-enzyme conjugates showed the streptavidin-alkaline phosphatase conjugate to be the most sensitive detection system. Using the optimised method, we were able to detect a single site for a 13.5 kb legumin gene clone.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00303040
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  • 10
    Electronic Resource
    Electronic Resource
    Studies of seed development in Pisum sativum (1975)
    Springer
    Planta 124 (1975), S. 297-302 
    Details
    ISSN: 1432-2048
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Variation in cell population size and cell weight in the cotyledons are important factors in determining seed weight in Pisum sativum. The regulation of these parameters as well as that of growth rate has been examined. The use of reciprocal crosses between varieties of contrasting seed size has allowed the recognition of two systems of control—an intrinsic one dependent on the seed's own genotype, and the extrinsic control of the maternal environment. It is shown that the use of particular kinds of crosses can aid in discriminating the separate roles of sinks and sources as determinants of seed size.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00388692
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