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  • 1975-1979  (2)
  • 1970-1974  (2)
  • Pomatoceros triqueter  (2)
  • Egg investments  (1)
  • Embryo  (1)
  • Polymer and Materials Science  (1)
Datenquelle
Materialart
Erscheinungszeitraum
Jahr
Schlagwörter
  • 1
    Digitale Medien
    Digitale Medien
    Development of the quiescent center in maturing embryonic radicles of pea (Pisum sativum L. cv. Alaska) (1977)
    Springer
    Planta 135 (1977), S. 233-240 
    Details
    ISSN: 1432-2048
    Schlagwort(e): Cell cycle ; DNA synthesis ; Embryo ; Pisum ; Quiescent center ; Root (radicle)
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract Maturing embryos of pea (Pisum sativum L. cv. Alaska) were treated with an aqueous solution of tritiated thymidine for 1 h, sectioned, and processed for autoradiography. An analysis of the distribution of labelled nuclei and mitotic figures demonstrated the presence of a quiescent center (QC) in the radicles of developing embryos. The QC developed in the radicle during the growth of the embryo. Immature radicles that did not contain a well-formed zone of root-cap initials did not show a QC. In the latter stages of seed ripening, the pattern of arrest of DNA synthesis and mitosis was tissue-specific. Cells within the QC remained inactive. The region lacking labelled nuclei and mitotic figures progressively expanded to include the root cap initials and then the provascular cylinder. Mitosis was arrested before DNA synthesis in the embryonic cortex. Cells within the QC synthesized DNA during the first stages of seed germination.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00384895
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  • 2
    Digitale Medien
    Digitale Medien
    On the egg investments and fertilization reaction inPomatoceros triqueter L. (1971)
    Springer
    Cell & tissue research 113 (1971), S. 388-395 
    Details
    ISSN: 1432-0878
    Schlagwort(e): Pomatoceros triqueter ; Egg investments ; Fertilization reaction ; Ultrastructure
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Summary The ultrastructure of unfertilized and fertilized egg investments ofPomatoceros triqueter is described. A characteristic feature is the presence of a hitherto unrecorded additional investment layer, inserted between the chorion and the “outer border layer”, which is referred to as the intermediate layer. The fertilization reaction consists of the release of cortical granule material into the perivitelline “space”, and the severing of the microvillous cytosome to “outer border layer” connections, thus allowing an increase in the width of the perivitelline “space”. More ridged corrugations are found on the outer surface of the investments in the fertilized as compared with the unfertilized condition.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00968546
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  • 3
    Digitale Medien
    Digitale Medien
    Some aspects of cleavage in Pomatoceros triqueter eggs (1972)
    Springer
    Cell & tissue research 123 (1972), S. 486-495 
    Details
    ISSN: 1432-0878
    Schlagwort(e): Pomatoceros triqueter ; Cytokinesis ; Surface folding ; New surface membrane ; Ultrastructure
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Summary The first cleavage division of Pomatoceros triqueter eggs is described. Time-lapse microcinematographic and electron microscopic studies revealed that, prior to division, the plasma membrane was folded into pleats. These were not present after division. This fact pointed to an unfolding of the plasma membrane which enabled it to cover the increased surface area resulting from cleavage. It is suggested that the pre-cleavage folds are derived from the membranes of the cortical granules, which continue releasing their contents into the perivitelline region following fertilization and first division. Filamentous material in the form of a band was present subjacent to the plasma membrane in the region of the furrow. The individual filaments of this band measure 5 to 7 nm in cross section, the dimensions being similar to those described for other kinds of dividing cells.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00335544
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  • 4
    Digitale Medien
    Digitale Medien
    The heat of dehydration of alumina trihydrate (1978)
    New York, NY [u.a.] : Wiley-Blackwell
    Fire and Materials 2 (1978), S. 37-38 
    Details
    ISSN: 0308-0501
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Architektur, Bauingenieurwesen, Vermessung , Maschinenbau
    Zusätzliches Material: 1 Tab.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/fam.810020110
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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