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  • 1
    ISSN: 1432-0886
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Samples of males reveal the presence of a large, mitotically stable supernumerary chromosome in five populations examined. A stable frequency (11.22±0.3%) of male carriers has been observed over nine years in one population. The supernumerary follows closely the condensation cycle and behaviour of the sex chromosome in spermatogonial mitosis and meiosis. A structure simulating a terminalized chiasma frequently joins the precocious sex and supernumerary chromosomes during meiotic prophase; these two chromosomes move preferentially (70%) to opposite poles during the subsequent stages producing a differential transmission of the supernumerary to the two sexes. It is possible that the stable frequency in the population is maintained by a conserved balance between the two sexes without the need of an elimination system. The evidence supports the interpretation that the supernumerary chromosome is partially homologous with the sex chromosome. The possibility that the supernumerary might evolve into a neo-Y chromosome is suggested.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Archives of microbiology 57 (1967), S. 232-238 
    ISSN: 1432-072X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Zusammenfassung Gegen den Pilz Trametes versicolor (Isolierung D4) wurde ein Antiserum entwickelt. Die Untersuchungen wurden mit der Agar-gel-Doppelt-diffusionsmethode ausgeführt und zeigten zum mindesten acht antigenische Komponenten in den Pilzen. Einige Antigene, die identisch zu denen in D4 sind, wurden in den anderen verwandten Pilzen entdeckt. Es wurden die beiden Arten des antiserums geprüft: das absorbierende und das nichtabsorbierende. Im ganzen scheinen sich die serologischen Daten mit der konventionellen Klassifizierung zu decken und so wird vorgeschlagen, daß man die serologische Methode gut zur Identifizierung verschiedener Trametes-Gattungen anwenden könnte.
    Notes: Summary An antiserum against Trametes versicolor isolate D4 has been developed. The use of agar-gel double-diffusion tests has revealed at least eight antigenic components in the fungus. Some antigens identical to those of D4 have been detected in other related fungi using both unabsorbed and absorbed antiserum. The overall serological data seem to agree with the conventional classification of these fungi and it is suggested that serological methods may be useful in identifying various Trametes species.
    Type of Medium: Electronic Resource
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