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  • 1
    Electronic Resource
    Electronic Resource
    Sadly confused (1989)
    [s.l.] : Nature Publishing Group
    Nature 338 (1989), S. 290-290 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] SIR—Frank W. Dobbs' criticism, (Nature 337, 497; 1989) is sadly correct, as you noted, but he is sadly mistaken on who was confused: it was Kepler who analysed Tycho's measurements and not Copernicus who analysed Kepler's — to wit: Copernicus 1473-1543, ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/338290d0
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  • 2
    Electronic Resource
    Electronic Resource
    Drosophila nurse cells produce a posterior signal required for embryonic segmentation and polarity (1988)
    [s.l.] : Nature Publishing Group
    Nature 335 (1988), S. 68-70 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Drosophila oogenesis starts with a germ cell which divides four times to yield a cluster of 16 cells connected by cytoplasmic bridges with the future oocyte in the most posterior position. The fifteen anterior cells form the nurse cell cluster, become polyploid and grow in volume until stage 10 ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/335068a0
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  • 3
    Electronic Resource
    Electronic Resource
    Analyse des ooplasmatischen Reaktionssystems vonEuscelis plebejus Fall. (Cicadina) durch Isolieren und Kombinieren von Keimteilen (1959)
    Springer
    Development genes and evolution 151 (1959), S. 430-497 
    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/BF00573355
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Aberrant oogenesis in the patterning mutant dicephalic of Drosophila melanogaster: time-lapse recordings and volumetry in vitro (1987)
    Springer
    Development genes and evolution 196 (1987), S. 279-285 
    Details
    ISSN: 1432-041X
    Keywords: Drosophila melanogaster ; Mutant oogenesis ; Time-lapse filming ; Maternal effect ; Pattern formation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Drosophila females homozygous for the mutation dicephalic occasionally produce ovarian follicles with a nurse-cell cluster on each oocyte pole (dic follicles). Most dic follicles contain 15 nurse cells as in the normal follicle, but the total nurse-cell volume is larger in dic follicles; this is in keeping with the increase in DNA content recently described. However, the relative increase in oocyte volume during nurse-cell regression (from stage 10B onward) is not significantly larger in dic than in normal follicles. Time-lapse recordings in vitro show that, as a rule, both nurse cell clusters in a dic follicle export cytoplasm to the oocyte but nurse-cell regression remains incomplete at both poles and the persisting remnants of the nurse cells cause anomalies in chorion shape. The kinematics of cytoplasmic transfer are less aberrant at that oocyte pole which harbours the germinal vesicle. Possible links are discussed between these anomalies of oogenesis and the double-anterior embryonic patterns observed in the majority of developing dic eggs.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00395950
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  • 5
    Electronic Resource
    Electronic Resource
    In situ localization of the transcripts of a homeobox gene in the honeybee Apis mellifera L. (Hymenoptera) (1988)
    Springer
    Development genes and evolution 197 (1988), S. 269-274 
    Details
    ISSN: 1432-041X
    Keywords: Apis mellifera ; Homeobox genes ; Dfd ; In situ hybridization ; Blastoderm
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary We have isolated and characterized a homeoboxcontaining gene from the honeybee Apis mellifera. Its homeobox region shows a high degree of sequence similarity to the homeobox of the Drosophila gene Deformed (Dfd). At the DNA level 82% of the basepairs are the same, whereas the putative amino acid sequences are identical between the bee and the fruitfly genes. Similarity is also present 5′ and 3′ to the homeobox. Using this isolate as a probe we have performed in situ hybridization on sections from blastoderm-stage embryos of the honeybee Apis mellifera. In early blastoderm stages we found a rather irregular pattern of labelled nuclei. In middle stages we found silver grains over each nucleus and also over the cytoplasm in a belt of blastoderm cells in the prospective gnathal region. These results indicate that the Deformed genes from honeybee and fruitfly are homologous both with respect to their DNA sequence and their spatial and temporal pattern of expression during embryogenesis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00380020
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  • 6
    Electronic Resource
    Electronic Resource
    Inverse correlation between mean nuclear DNA content and cell number in nurse cell clusters of Drosophila (1986)
    Springer
    Chromosoma 94 (1986), S. 36-44 
    Details
    ISSN: 1432-0886
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract In the Drosophila ovarian follicle, 15 polyploid nurse cells (NC) are linked by cytoplasmic bridges to the anterior pole of the oocyte. The mutant dicephalic occasionally produces aberrant follicles whose 15 nurse cells are separated into two clusters, each attached to one oocyte pole [split nurse cell (SNC) follicles]. Feulgen cytophotometry of isolated nuclei from such clusters and from normal follicles of the same females revealed an inverse correlation between NC number per cluster and mean DNA content per nucleus. The maximum DNA content of nuclei from split NC clusters falls into the 4,096 C class as opposed to the 2,048 C class in 15 NC clusters; the mean DNA content per NC nucleus is 1,940 C in the former and 1,340 C in the latter. These correlations are confirmed by measurements on follicles containing fewer or more than 15 NC, and on SNC follicles from another mutant (spindel C). These findings indicate that replication in NC nuclei is controlled with reference to the transcriptional capacity of the individual NC cluster rather than the total capacity available per oocyte or follicle. We discuss this finding with respect to embryonic patterning as influenced by nurse cell location and list and discuss conflicting published reports on over- and underreplication in Drosophila follicles.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00293528
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  • 7
    Electronic Resource
    Electronic Resource
    Darwin und Mendel. Wendepunkte im biologischen DenkenNach einem Vortrag im Studium Generale der Albert-Ludwigs-Universität Freiburg i. Br. Die Zitate stammen aus den angegebenen Sekundärquellen. (1988)
    Weinheim : Wiley-Blackwell
    Biologie in unserer Zeit 18 (1988), S. 161-167 
    Details
    ISSN: 0045-205X
    Keywords: Life and Medical Sciences
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/biuz.19880180602
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  • 8
    Electronic Resource
    Electronic Resource
    Theodor Schwann und die „Theorie der Organismen“ -  Zur Begründung der Zellenlehre vor 150 Jahren (1989)
    Weinheim : Wiley-Blackwell
    Biologie in unserer Zeit 19 (1989), S. 181-188 
    Details
    ISSN: 0045-205X
    Keywords: Life and Medical Sciences
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology
    Notes: Im Jahre 1839 veröffentlichte der Museumsgehilfe und angehende Professor Dr. med. Theodor Schwann in Berlin ein schmales Bändchen mit dem Titel Mikroskopische Untersuchungen über die übereinstimmung in der Struktur und dem Wachsthum der Thiere und Pflanzen (Abbildungen 1,2). Es gilt zusammen mit Matthias Schleidens Abhandlung Beiträge zur Phytogenesis, erschienen 1838, als Geburtsdokument der Zellbiologie. Schwanns Postulat, daß die Zelle der gemeinsame Grundbaustein aller Lebewesen sei, wurde bald als „Zellenlehre“ Allgemeingut. Unter dem Begriff „Zellentheorie“, der sich heute weithin dafür eingebürgert hat, verstand Schwann allerdings etwas ganz anderes - eine Theorie der Entstehung der Zellen und letztlich der Organismen (Abbildung 3).
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/biuz.19890190603
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  • 9
    Electronic Resource
    Electronic Resource
    Das Stereomikroskop - Ursprünge und geschichtliche Entwicklung (1987)
    Weinheim : Wiley-Blackwell
    Biologie in unserer Zeit 17 (1987), S. 161-168 
    Details
    ISSN: 0045-205X
    Keywords: Life and Medical Sciences
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/biuz.19870170605
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  • 10
    Electronic Resource
    Electronic Resource
    Hans Spemann (1869-1941) (1985)
    Weinheim : Wiley-Blackwell
    Biologie in unserer Zeit 15 (1985), S. 112-119 
    Details
    ISSN: 0045-205X
    Keywords: Life and Medical Sciences
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/biuz.19850150408
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