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  • 1
    Electronic Resource
    Electronic Resource
    Induced neo-centric activity in chromosome ends (1960)
    Springer
    Chromosoma 11 (1960), S. 310-312 
    Details
    ISSN: 1432-0886
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00328657
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  • 2
    Electronic Resource
    Electronic Resource
    Autonomous and interrelated formation of chiasmata in Delphinium chromosomes (1962)
    Springer
    Chromosoma 13 (1962), S. 577-587 
    Details
    ISSN: 1432-0886
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary 1. Chiasma frequency observations in Delphinium showed an interchromosome effect which occurs consistently in a large number of plants. 2. An interplant analysis indicated that significant differences in mean chiasma frequency do not affect the direction or the degree of interchromosome correlation which in the present material was invariably found to be of the negative type. When the analysis was extended to intraplant level however, a positive relationship was revealed between the strength of the interchromosome correlation and the number of chiasmata in a cell, the relation tending to breakdown towards the higher extreme of the chiasma range. 3. It has been concluded from these observations that each chromosome pair is adapted to have a minimum number of chiasmata independently of others but the different pairs show a competition effect beyond this threshold frequency. The competition is relaxed after a saturation point is reached. 4. Evidence has also been presented which supports the conclusion that the threshold beyond which interchromosome effects occur may vary in different individuals showing genetically determined differences in their chiasma frequencies. This variation partly accounts for the extremely variable behaviour of different organisms both at inter and intraspecies level with regard to interchromosome effects.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00321165
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  • 3
    Electronic Resource
    Electronic Resource
    Experimental production of a new karyotype in Delphinium (1963)
    Springer
    Chromosoma 14 (1963), S. 534-540 
    Details
    ISSN: 1432-0886
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary A new karyotype which is both viable and stable has been obtained in Delphinium following X-ray induced chromosomal rearrangements. It shows, on the whole, greater symmetry than the parental karyotype although one of the chromosome pairs was reduced to a minute size. The meiotic sequence in the structural heterozygote and the isolation of the homozygote having the altered karyotype in its progeny have been briefly described. The structural rearrangement has been found to be associated with a change in the growth habit of the plants, indicating a possible position effect.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00321472
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  • 4
    Electronic Resource
    Electronic Resource
    Actinomycin D induced chromosome breakage and suppression of meiosis in the locust, Schistocerca gregaria (1967)
    Springer
    Chromosoma 21 (1967), S. 463-471 
    Details
    ISSN: 1432-0886
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Treatment with Actinomycin D has been found to induce chromosome breakage in the spermatocytes of the locust. The broken ends appear not to have the capacity to reunite or to restitute. The treatment with this chemical has also been found to affect the development of the potential spermatocytes so that they fail to enter meiosis. The expected meiotic sequence is found to be replaced by a mitotic division. It has been concluded that both chromosomal aberrations and the effect on development of spermatocytes result from disorganization of the synthetic apparatus of the cells.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00336953
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  • 5
    Electronic Resource
    Electronic Resource
    LSD induced genetic damage in barley (1971)
    Springer
    Chromosoma 32 (1971), S. 142-151 
    Details
    ISSN: 1432-0886
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract LSD has been found to induce extensive chromosomal aberrations in barley. The drug also stimulated mitotic activity in cells of the root tips within a few hours of the treatment. The chromosomal aberrations induced by LSD appeared to be qualitatively different from those produced by ionizing radiation and various other chemicals. Most of the broken ends failed to reunite and there was a disproportionately large number of breaks in the region of the centromere. The seedling height was found to be reduced as a result of treatment, presumably because of the induced genetic damage.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00286004
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  • 6
    Electronic Resource
    Electronic Resource
    Interchromosome Effects of Chiasmata and Crossing-over (1963)
    [s.l.] : Nature Publishing Group
    Nature 197 (1963), S. 725-726 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] A one-to-one relation between chiasma formation and chromatid exchange has been demonstrated by Brown and Zohary6 following their observations on heteromorphic bivalents and their anaphase separation in the pollen mother cells of Lilium. Further evidence which indicates a correspondence between ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/197725a0
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  • 7
    Electronic Resource
    Electronic Resource
    Experimentally Induced Inter-bivalent Redistribution of Chiasmata in Delphinium (1960)
    [s.l.] : Nature Publishing Group
    Nature 186 (1960), S. 260-261 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Dry seeds of Delphinium ajacis variety 'Comet' ^vvere irradiated with an X-ray dose of 15,000 r. 50 kV.). The Xl plants raised from these showed -certain cytological characteristics which appeared ~to be of interest. Apart from gross structural changes in the chromosomes of some of the plants which ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/186260a0
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  • 8
    Electronic Resource
    Electronic Resource
    Correlated Failure of Synthetic Activities in a Wheat Chromosome (1958)
    [s.l.] : Nature Publishing Group
    Nature 182 (1958), S. 1458-1459 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] In the New Pusa wheat variety 797, meiosis is entirely regular except for the occurrence in some of the plants of one or rarely two small chromosome fragments in many of their pollen mother cells. Ahuja (personal communication, 1957), who analysed a large number of plants, found that the fragments ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/1821458a0
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  • 9
    Electronic Resource
    Electronic Resource
    Temperature Sensitivity of Chromosomes in Diploid and Polyploid Species of Wheat (1963)
    [s.l.] : Nature Publishing Group
    Nature 200 (1963), S. 499-500 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Plants of the four species, taken at comparable stages, were subjected to a treatment of 37 1 C (relative humidity 70) for various durations of 2 96 h immediately before fixation of the flower buds for cytological analysis, The more important temperature effects were found to include degeneration ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/200499a0
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  • 10
    Electronic Resource
    Electronic Resource
    Differential Response of Some Tomato Genes to Base-specific Mutagens (1966)
    [s.l.] : Nature Publishing Group
    Nature 211 (1966), S. 652-652 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The different treatments, details of which are presented in Table 1, were given to seeds (500 in each case) pre-soaked in water for various durations. The joH's of the freshly-prepared solutions were adjusted in a manner described elsewhere5. The observations on induced mutations were recorded ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/211652a0
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