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  • 1
    Electronic Resource
    Electronic Resource
    The Effect of H2O and HCl on isobutylene polymerization coinitiated by BCl3 (1986)
    Springer
    Polymer bulletin 15 (1986), S. 201-208 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The effect of H2O and HCl initiators on the BCl3 coinitiated polymerization of isobutylene was investigated by comparative experiments carried out in CH2Cl2 solvent in the range range from −50 to −100°C under high vacuum (superdry conditions) and in the dry box (conventional condition). H2O is a much more efficient initiator than HCI and the reasons for this are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00255063
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  • 2
    Electronic Resource
    Electronic Resource
    A comparison of Hordeum bulbosum-mediated haploid production efficiency in barley using in vitro floret and tiller culture (1989)
    Springer
    Theoretical and applied genetics 77 (1989), S. 701-704 
    Details
    ISSN: 1432-2242
    Keywords: (Hordeum vulgare L.) ; Hordeum bulbosum ; Haploid production ; Floret culture ; Detached tiller culture
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary A high efficiency of Hordeum bulbosum-mediated haploid production in barley has been achieved using a floret culture technique in which florets pollinated with Hordeum bulbosum are cultured on modified N6 media containing 0.5 mg/l kinetin and 1.2 mg/l2,4-D. Cultures were maintained at 25 °C with a 16 h photoperiod for 9 days before embryo rescue. In a comparison of haploid production efficiency using five F1 hybrids from winter x winter and winter x spring barley crosses, 41.6 haploid plants/100 florets pollinated were produced using floret culture. Using detached tiller culture, 13.5 haploid plants/100 florets pollinated were produced. Higher efficiencies achieved with floret culture are attributed to the formation of larger, differentiated embryos. Such embryos lead to higher frequencies of plant regeneration. The F1 from a winter x winter cross was inferior in haploid production compared to F1s from winter x spring crosses. No genotype x technique interaction was observed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00261247
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  • 3
    Electronic Resource
    Electronic Resource
    The ultrastructure of polymorphic pollen grains of Canna indica L. (1989)
    Springer
    Sexual plant reproduction 2 (1989), S. 193-198 
    Details
    ISSN: 1432-2145
    Keywords: Polymorphism ; Ultrastructure ; Pollen grains ; Canna indica L ; Tannin
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Our investigations on Canna indica L. indicate that the pollen of this species is polymorphic: there are two types of pollen — a larger type and a comparatively smaller type. Transmission electron microscopy (TEM) revealed the presence of small vacuoles containing tannic substances in the generative cell (GC) of the larger grains: the GC of the mature grain contained a higher quantity of tannins than the GC of the immature grain. Mitochondria, lipid bodies, rough endoplasmic reticulum (RER) and microtubular bundles were present in the cytoplasm of the GC. Numerous mitochondria, lipid bodies and plastids were also present in the vegetative cell (VC), with the mitochondria clustered around the vegetative nucleus. The plastids were observed to be associated with the RER cisterns. During the maturation process, the number of starch grains contained in the plastids decreased.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00192766
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