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  • 1
    ISSN: 1434-601X
    Keywords: 25.70.Jj ; 24.70.+s
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Fusion cross sections for the23Na+23Na entrance channel were measured at beam energies between 80 and 177 MeV by detecting the evaporation residues from the compound nucleus46Ti. Additionally the tensor analyzing powerT 20 fus for fusion of aligned23Na with23Na was measured atE=170 MeV bombarding energy. The results for the fusion cross section and ofT 20 fus , together with results from other fusion reactions, leading to the same compound nucleus46Ti, are discussed in terms of entrance channel and compound nucleus models, which both intend to describe the observed limitation of fusion at high energies. It is shown thatT 20 fus represents a sensitive test for heavy-ion fusion models at these energies.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Protoplasma 109 (1981), S. 257-269 
    ISSN: 1615-6102
    Keywords: Acetabularia ; Dasycladalean green alga ; Flagellar roots ; Microtubules ; Striated fiber ; Phylogeny
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Ultrastructural investigation of the flagellar root system ofAcetabularia gametes reveals one type of organization for both male and female gametes. There is a modified cruciate system with four microtubular bands X-2-X-2, with X=4. A prominent distal striated fiber and a small proximal striated fiber connect the flagellar bases. A striated root fiber type I underlies the microtubular root type II, and a short striated root fiber type I underlies the microtubular root type I (terminology ofMelkonian 1980 b). This specific root system has some details in common with theChlamydomonas type, and others with theUlvaphyceae and the siphonalean algaeDerbesia andBryopsis. This might indicate the phylogenetic relationships.
    Type of Medium: Electronic Resource
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