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  • 1
    Electronic Resource
    Electronic Resource
    A non-doubling DNA series in somatic tissues of the locusts Schistocerca gregaria (Forskål) and Locusta migratoria (Linn.) (1970)
    Springer
    Chromosoma 29 (1970), S. 446-461 
    Details
    ISSN: 1432-0886
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Locusta migratoria has only 70% of the germ line DNA value of the related species Schistocerca gregaria in spite of a uniform karyotype. This difference is maintained in the nuclei of the testis wall, ovariole tip, mid-gut diverticulum, Malpighian tubule and fat. The distribution of nuclear DNA contents is tissue specific but the peaks in the distributions do not conform with members of a doubling series. It is suggested that both phenomena may be connected with the mechanism of tissue differentiation in insects, the latter by differential replication of those chromosome regions which are active in particular tissues.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00281927
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  • 2
    Electronic Resource
    Electronic Resource
    Carbon Dioxide as Hydrogen Acceptor in Dehydrogenation of Alkanes (1972)
    s.l. : American Chemical Society
    Industrial and engineering chemistry 11 (1972), S. 444-446 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/i360044a017
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  • 3
    Electronic Resource
    Electronic Resource
    Drosophila enzyme-genetics: A table (1971)
    Springer
    Cellular and molecular life sciences 27 (1971), S. 218-220 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Zusammenfassung Durch Verwendung elektrophoretischer Enzym-Mutanten ist es möglich, beiDrosophila melanogaster die chromosomale Position der entsprechenden Strukturgene zu bestimmen. Über 20 Gene sind auf diese Weise lokalisiert worden. Untersuchung der Gewebe-und Stadienspezifität dieser Enzyme, im Verband mit zytogenetischer Analyse der Riesenchromosomen, verspricht wertvolle Einblicke in das Problem der Genregulation. In den vorliegenden Tabellen sind die bereits erzielten Ergebnisse zusammengestellt.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02145906
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  • 4
    Electronic Resource
    Electronic Resource
    Drosophila enzyme-genetics: A table (1971)
    Springer
    Cellular and molecular life sciences 27 (1971), S. 1376-1376 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02136749
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  • 5
    Electronic Resource
    Electronic Resource
    Variation in chiasma frequency during tulip anther development (1974)
    Springer
    Chromosoma 46 (1974), S. 173-179 
    Details
    ISSN: 1432-0886
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract In tulip anthers meiosis begins first in the pollen mother cells next to the point of entry of the vascular bundle at the base. It then proceeds in a wave to the free end of the anther. The first cells to pass through meiosis have the lowest chiasma frequency and cells with a lower cell chiasma frequency have a lower total bivalent length. It is suggested that some factor which passes through the vascular bundle may cause the developmental variations in chiasma frequency possibly by first altering chromosome length (Summary see p. 179.)
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00332515
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  • 6
    Electronic Resource
    Electronic Resource
    DNA replication and RNA transcription of euchromatic and heterochromatic chromosome regions during grasshopper meiosis (1974)
    Springer
    Chromosoma 45 (1974), S. 43-62 
    Details
    ISSN: 1432-0886
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract The sequence of chromosome replication and the extent of RNA transcription were determined for pre-meiotic S-phase and first meiotic prophase in males of Myrmeleotettix maculatus and Chorthippus parallelus. Some heterochromatic chromosome segments are replicated early in S-phase while others are replicated late. In general, heavily condensed heterochromatic regions of the chromosomes show little or no RNA transcription as defined by 3H-uridine incorporation. Extra (i.e. in excess of 2) M4 autosomes in Ch. parallelus are slightly more condensed (heterochromatic) than their two homologues and this change in coiling behaviour is paralleled by a reduction in the rate of transcription and a change in the time of its replication, more of the DNA being synthesised at the end of S-phase. These findings are discussed in relation to the definition of heterochromatin.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00283829
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  • 7
    Electronic Resource
    Electronic Resource
    The replicative status of heterochromatic and euchromatic DNA in two somatic tissues of Dermestes maculatus (Dermestidae: Coleoptera) (1971)
    Springer
    Chromosoma 33 (1971), S. 183-195 
    Details
    ISSN: 1432-0886
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Replication of DNA present in euchromatin and heterochromatin remains in step in most nuclei of the testis wall of Dermestes maculatus. However, in a minority class of testis wall nuclei heterochromatic DNA has undergone two or three fewer rounds of replication than DNA located in euchromatin. A similar situation exists in many nuclei of the Malpighian tubule though here there is also the possibility that the euchromatic and heterochromatic DNA components are themselves not completely replicated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00285632
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  • 8
    Electronic Resource
    Electronic Resource
    The control of chiasma distribution in the locust, Schistocerca gregaria (Forskål) (1973)
    Springer
    Chromosoma 43 (1973), S. 289-328 
    Details
    ISSN: 1432-0886
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Chiasma distribution at diplotene in Schistocerca gregaria males can be taken to indicate the positions at which crossing over occurred prior to diplotene since chiasma terminalisation is entirely absent. Analysis of chiasma frequency and position leads to a model for the mechanism controlling distribution which has three main components. — i) The bivalents vary in length between cells due to unknown factors and increase in bivalent length leads to an increase in chiasma frequency. — ii) Within bivalents chiasma initiation is sequential from telomere to centromere with the first chiasma usually forming close to the telomere. — iii) Interference operates with the same polarity and determines a distance within which crossing over is precluded.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00294277
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  • 9
    Electronic Resource
    Electronic Resource
    DNA values in somatic tissues of Dermestes (Dermestidae: Coleoptera) (1970)
    Springer
    Chromosoma 31 (1970), S. 321-330 
    Details
    ISSN: 1432-0886
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract The organisation of the male Malpighian tubule has been investigated in the coleopteran genus Dermestes. Nuclear number is found to be more or less constant between species. However, the DNA values of these nuclei do not, in general, reflect the germ-line DNA value of the species since many of them do not conform with members of a doubling series. These phenomena may be interpreted as aspects of the control of tissue and organ size, the final dimensions of the Malpighian tubules being similar in spite of presumed differences in 2C cell size in the different species.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00321228
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  • 10
    Electronic Resource
    Electronic Resource
    U-type exchange in tulip meiosis (1973)
    Springer
    Chromosoma 41 (1973), S. 421-436 
    Details
    ISSN: 1432-0886
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract U-type exchanges occur with a frequency of about 2/meiocyte in some plants of Tulipa hageri. Most, if not all, of these exchanges are between sister chromatids and they may be incomplete. These events clearly depend on some special property of first meiotic prophase cells since they do not occur during mitosis. However, their relationship to chiasmata is at present obscure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00396500
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