Library

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
  • 1970-1974  (4)
  • 1973  (2)
  • 1970  (2)
Source
Material
Years
  • 1970-1974  (4)
Year
  • 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
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    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
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    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
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    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
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...