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  • 1
    Electronic Resource
    Electronic Resource
    Ultrastructural research on cell wall regeneration by cultured pollen protoplasts of Lilium longiflorum (1988)
    Springer
    Sexual plant reproduction 1 (1988), S. 36-45 
    Details
    ISSN: 1432-2145
    Keywords: Pollen protoplast ; Pollen tube ; Lilium longiflorum ; Cell wall regeneration
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Protoplasts from pollen grains of Lilium longiflorum regenerate amorphous cellulosic cell walls in culture, during which some precursors of cellulose are polymerized, thus producing progressively harder cellulosic cell walls as the period of culture continues. It is presumed that the components of the cell wall regenerated during 1 week in culture differ from those of the intine of the pollen grain wall. The regenerated cell wall is formed by means of large smooth vesicles; in addition, numerous coated vesicles and pits aid in wall regeneration. The pollen tube that germinates from the 8-day-old cultured protoplast has numerous Golgi bodies and many vesicles which build the pollen tube wall. The tube wall has two layers just like a normal pollen tube wall.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00227021
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Superconducting single crystals (1989)
    [s.l.] : Nature Publishing Group
    Nature 337 (1989), S. 21-22 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] SIRá€"Were large single crystals of the high-temperature superconductors of the type La2_^CuO4 available (where A represents Ba or Sr), their physical and structural properties might provide insight into the still unknown mechanism of high-temperature superconductivity. By use of ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/337021b0
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  • 3
    Electronic Resource
    Electronic Resource
    Peptide chain structure parameters, bond angles and conformational angles from the Cambridge Structural Database (1987)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 43 (1987), S. 212-218 
    Details
    ISSN: 1600-5740
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108768187098045
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  • 4
    Electronic Resource
    Electronic Resource
    Isolation of generative cells and their protoplasts from pollen ofLilium longiflorum (1988)
    Springer
    Protoplasma 142 (1988), S. 68-73 
    Details
    ISSN: 1615-6102
    Keywords: Generative cell ; Haploid protoplast ; Lilium longiflorum ; Pollen protoplast
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Methods are described for the isolation of large quantities of generative cells and their protoplasts from the pollen ofLilium longiflorum. First, large numbers of pollen protoplasts were enzymatically isolated from immature pollen grains. When they were gently disrupted mechanically, the pollen contents including spindle-shaped generative cells were released. The generative cells were separated from other structures by Percoll density gradient centrifugation. They were nearly spherical, but had a callosic cell wall. The isolated generative cells were then re-treated in enzyme solution to yield authentic protoplasts. The generative cell protoplasts, “gametoplasts”, were uniform in size and contained a condensed haploid nucleus with relatively little cytoplasm.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01273227
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