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  • 1
    Electronic Resource
    Electronic Resource
    Buchbesprechungen (1966)
    Springer
    Naturwissenschaften 53 (1966), S. 620-620 
    Details
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00632294
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  • 2
    Electronic Resource
    Electronic Resource
    Die ersten Furchungsteilungen bei Bithynia tentaculata L. (1955)
    Springer
    Naturwissenschaften 42 (1955), S. 374-374 
    Details
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00629027
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  • 3
    Electronic Resource
    Electronic Resource
    Die Entwicklung von Halbkeimen bei Bithynia tentaculata L. (1955)
    Springer
    Naturwissenschaften 42 (1955), S. 398-398 
    Details
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00640874
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  • 4
    Electronic Resource
    Electronic Resource
    Die Entwicklung von Halbkeimen bei Limnaea stagnalis (1957)
    Springer
    Naturwissenschaften 44 (1957), S. 383-383 
    Details
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00629466
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  • 5
    Electronic Resource
    Electronic Resource
    Die Entwicklung von Halbkeimen bei dem SüsswasserpulmonatenLimnaea stagnalis L. (1957)
    Springer
    Development genes and evolution 150 (1957), S. 124-145 
    Details
    ISSN: 1432-041X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00576817
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  • 6
    Electronic Resource
    Electronic Resource
    Genetic factors affecting normal growth of testes inDrosophila hydei (1985)
    Springer
    Development genes and evolution 194 (1985), S. 131-139 
    Details
    ISSN: 1432-041X
    Keywords: Testes ; Growth ; Y chromosome ; Ribosomal RNA ; Drosophila
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary A marked growth in the length of testes ofDrosophila hydei males occurred during pupal development. This growth continued over the first 8 days of adult life and in the young adults sperm were not produced until the testes increased approximately threefold in length to about 28 mm. The length of testes is correlated with genetic factors on the X and Y chromosomes. In males lacking a Y chromosome (X/O) or the short arm (YS) of the Y chromosome (X/YL) the testes were about half the length of testes of control males (X/Y) or double Y males (X/Y/Y). Males with deletions of the distal YL chromosome arm had testicular lengths equivalent to the controls. Males with short testes (X/O and X/YL) showed disruptions to spermatogenesis at meiosis and an absence of normal spermatid elongation. Reduction of active ribosomal RNA genes on the X chromosome in X/O caused an increased expression ofbobbed (bb) and a corresponding reduction in length of testes. Severelybobbed X/O males had very few cysts of spermatogonia and these cysts did not develop into primary spermatocytes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00848313
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  • 7
    Electronic Resource
    Electronic Resource
    Die Entwicklung von Halbkeimen bei dem Süsswasser-ProsobranchierBithynia tentaculata L. (1956)
    Springer
    Development genes and evolution 148 (1956), S. 336-361 
    Details
    ISSN: 1432-041X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00573732
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  • 8
    Electronic Resource
    Electronic Resource
    Die Entwicklung von Exogastrulakeimen bei dem Süsswasser-ProsobranchierBithynia tentaculata L. (1956)
    Springer
    Development genes and evolution 148 (1956), S. 474-488 
    Details
    ISSN: 1432-041X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00593128
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  • 9
    Electronic Resource
    Electronic Resource
    Struktur-Differenzierungen im Y-Chromosom von Drosophila hydei und ihre Beziehungen zu Gen-Aktivitäten (1965)
    Springer
    Chromosoma 16 (1965), S. 222-248 
    Details
    ISSN: 1432-0886
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary During the growth stage of the primary spermatocytes of Drosophila hydei intranuclear structures can be seen, which are comparable to the loops of lampbrush chromosomes. These structures are formed by specific organizers. Sequence and loci of these organizers on the Y chromosome have been mapped by cytogenetic methods, using Y translocations and Y fragments. For the localization analysis the long arm of the Y chromosome is divided into ten equal segments which are designated 1–10 starting at the kinetochore. The organizer of the loop called “threads” is located in segment 10 or 9 at the distal tip of the long arm, the chromosome site which forms the “pseudonucleolus” is located in segment 9 or 8, the locus of the site for the “tubular ribbons” was determined in segment 2 or 3 and that for the “clubs” in segment 1. A new, fifth loop of the Y chromosome has been detected. It has been called “noose” and its organizer lies on the short arm of the Y chromosome. Large parts of the Y chromosome, including one segment which is more than one half of the long arm are not involved in loop-formation. If Y chromosome segments containing any one of the five loops are lacking, the males are always sterile. Furthermore, spermiogenesis is blocked at different stages depending upon which of the loops is absent. The possible role of the genetic information located within the loops is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00320950
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  • 10
    Electronic Resource
    Electronic Resource
    Morphologische Variabilität der chromosomalen Funktionsstrukturen in den Spermatocytenkernen von Drosophila-Arten (1967)
    Springer
    Chromosoma 21 (1967), S. 429-445 
    Details
    ISSN: 1432-0886
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Description / Table of Contents: Zusammenfassung In der Gattung Drosophila treten in den Zellkernen von primären Spermatocyten chromosomale Funktionsstrukturen auf, die im Prinzip wie die lateralen Schleifenpaare von Lampenbürstenchromosomen organisiert sind. Die Form der Schleifen ist bei jeder Art in artspezifischer Weise abgewandelt. Die morphologische Variabilität der Spermatocytenstrukturen von 54 Drosophila-Arten wird beschrieben. Das genetische Material in den Schleifen spielt möglicherweise eine entscheidende Rolle bei der Vorfertigung, Stabilisierung und programmierten Verpackung von Genprodukten, die erst in späteren Stadien während der Spermiohistogenese in den Zellen verbraucht werden.
    Notes: Abstract In the genus Drosophila the nuclei of primary spermatocytes contain special chromosomal functional structures which are organized as the pairs of lateral loops in lampbrush chromosomes. In each species the loops have their own species specific morphology. The morphological variability of the spermatocyte structures in 54 Drosophila species is described. Although the nuclei of spermatids are synthetically inactive, the cells are able to synthesize proteins which are essential for the differentiation of sperm. Therefore, special mechanisms are necessary for the preformation, stabilization, and programmed packaging of gene products during the spermatocyte stage. This may be the function of the spermatocyte loops.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00336951
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