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  • 1990-1994  (5)
  • 1985-1989  (3)
  • 1
    Electronic Resource
    Electronic Resource
    The basis for the symmetric irreducible representations of SO(9) (1986)
    College Park, Md. : American Institute of Physics (AIP)
    Journal of Mathematical Physics 27 (1986), S. 442-446 
    Details
    ISSN: 1089-7658
    Source: AIP Digital Archive
    Topics: Mathematics , Physics
    Notes: An explicit basis is constructed for the symmetric irreducible representation (irrep) of SU(9)&supuline;SO(9)&supuline;SO(5)×SU1(2)×SU2(2). It is also indicated how good angular momentum states can be constructed. The techniques used are based on the well-known tensor algebra for the infinitesimal generators of simple Lie groups.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.527239
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    In situ localisation of beet necrotic yellow vein virus (BNYVV) in rootlets of susceptible and resistant beet plants (1994)
    Springer
    Archives of virology 136 (1994), S. 349-361 
    Details
    ISSN: 1432-8798
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Mechanisms of resistance to beet necrotic yellow vein virus (BNYVV) were studied by comparing the multiplication and distribution of BNYVV in root tissue of some beet accessions. Seedlings were infected either by soil containing resting spores ofPolymyxa betae with BNYVV, or by a viruliferous zoospore suspension. With both inoculation methods high virus concentrations were obtained in rootlets of the susceptible cultivar ‘Regina’. Using infested soil, low virus concentrations were found in the partially resistant cultivar ‘Rima’ and in the resistant accessions Holly and WB42. When a zoospore suspension was used, similar virus concentrations occurred in ‘Rima’ and Holly as in ‘Regina’, while a low virus concentration was found in WB42. By in situ localisation studies, using immunogold-silver labelling, virus was detected in ‘Regina’ after infection by soil or a zoospore suspension, but it could only be detected in the resistant accessions after infection by a zoospore suspension. In rootlets of ‘Regina’, ‘Rima’ and Holly, virus was found in the epidermis, cortex parenchyma, endodermis, and interstitial parenchyma, but in general not inside the vascular tissue. In WB42 the virus, occurring in small aggregates, seemed to be restricted to the epidermis and some cortex parenchyma cells. Comparing both the multiplication and distribution of BNYVV in rootlets of the accessions studied, it is concluded that the virus resistance mechanism in ‘Rima’ and Holly is different from that in WB42.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01321063
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Intermittency, a test for string fragmentation processes (1992)
    Springer
    The European physical journal 343 (1992), S. 235-242 
    Details
    ISSN: 1434-601X
    Keywords: 13.65.+i ; 13.87.Fh
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The Artru-Mennessier and the string fragmentation procedure as implemented in the code VENUS have been compared. The two fragmentation prescriptions predict a similar rapidity spectrum including its energy dependence and event multiplicities, but give rise to very different intermittency results.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01291829
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    E1 calculations in thesdf-interacting boson model (1990)
    Springer
    The European physical journal 337 (1990), S. 293-295 
    Details
    ISSN: 1434-601X
    Keywords: 23.30.Ck ; 21.60.Fw ; 27.70.+q
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A simple IBA-sdf form for theE1 transition operator containing an one-body term and a two-body term is tested in a non-analytical case. TheE 1 transition probabilities in the rare-earth region are reproduced rather well.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01289695
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    The even massN=83 isotones in the generalized seniority scheme (1989)
    Springer
    The European physical journal 332 (1989), S. 1-7 
    Details
    ISSN: 1434-601X
    Keywords: 21.10.Dr ; 21.30.+Y ; 21.60.Cs
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The results of a calculation in the generalized seniority scheme for the odd-oddN=83 isotones is presented. Results are compared with data and with a calculation in the framework of the IBA model. From the latter estimates for parameters in the bosonfermion interaction have been obtained.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01292574
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  • 6
    Electronic Resource
    Electronic Resource
    Evidence for the two-body nature of theE1 transition operator in the sdf-interacting boson model (1989)
    Springer
    The European physical journal 332 (1989), S. 29-32 
    Details
    ISSN: 1434-601X
    Keywords: 21.60.Ev ; 23.20.CK ; 27.60.+j
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Two new absolute transition rates are reported for the nucleus144Sm following an (α, α′) Coulomb excitation study. They are B(E3; 3−→ 0+)=(38±3) W.u. and B(E1;3− → 2+)=(2.8±0.4)×10−3 W.u. This large E1 matrix element, along with the previously known B(E1; 1− →+) value support the interpretation of the 1− state in this nucleus as 2-phonon 2+ × 3− excitation. In the frame of the IBM-1 +f-boson model we show the need for a two-body term in the E1 transition operator. Estimates for the strengths of the one and two-body parts of the E1 transition operator are obtained from these experimental data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01292577
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    The pion contribution to semi-inclusive deep inelastic scattering with slow baryons in the final state (1992)
    Springer
    The European physical journal 343 (1992), S. 461-466 
    Details
    ISSN: 1434-601X
    Keywords: 13.15.Dk ; 13.60.Hb
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We analyze the pion-exchange contribution to semi-inclusive leptoproduction on protons, with a slow nucleon or delta in the final state. We calculate the crosssection for slow protons including also the effect of the delta intermediate state, which is the dominant contribution. A comparison with recent experiment shows reasonable agreement for small Bjorkenx, if the cut-off in the pion-nucleon-delta form-factor is chosen to be around 0.7 GeV. This substantiates the recent conjecture that sea-quark distributions can be completely associated with the meson cloud, but suggests that the pion-nucleon-delta form-factor should be softer than the one used in description of nuclear forces by meson exchange. We also compare the pion-exchange and the string-fragmentation models and point out possible future experimental tests.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01289823
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    High frequency somatic embryogenesis and plant regeneration from zygotic embryo-derived callus cultures of three Allium species (1992)
    Springer
    Plant cell, tissue and organ culture 30 (1992), S. 181-191 
    Details
    ISSN: 1573-5044
    Keywords: abscisic acid ; Allium cepa ; Allium fistulosum ; Allium porrum ; MS medium
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The plant regeneration ability of zygotic embryo-derived callus cultures was studied for 12 A. cepa varieties and accessions, two A. fistulosum varieties, one A. fistulosum x A. cepa interspecific hybrid and two A. porrum varieties. Compact embryogenic callus was induced on Murashige and Skoog (MS) medium supplemented with 2,4-dichlorophenoxyacetic acid. The embryogenic calluses of all three Allium species were similar in appearance. For all accessions tested plants could be regenerated at a high frequency from this compact callus through somatic embryogenesis, when using kinetin supplemented MS medium (regeneration medium). Addition of abscisic acid to the regeneration medium stimulated the formation of both somatic embryos and shoots for a number of varieties. Concerning shoot regeneration from callus cultures, significant differences existed between genotypes of all accessions except one.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00040020
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