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  • Boson degeneracy and superfluidity of helium-4  (3)
  • Glomus aggregatum  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Il nuovo cimento della Società Italiana di Fisica 14 (1992), S. 229-238 
    ISSN: 0392-6737
    Keywords: Boson degeneracy and superfluidity of helium-4 ; Quantum effects on the structure and dynamics of nondegenerate fluids (e.g., normal phase liquid helium-4) ; Other topics in thermal properties of condensed matter
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Summary The form of Goldstone excitation in superfluid He4 is envisaged by the formalism of scaling transformation. This is achieved within the framework of symmetry-breaking mechanism which is akin to that of the relativistic quantum field theory.
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Il nuovo cimento della Società Italiana di Fisica 14 (1992), S. 239-252 
    ISSN: 0392-6737
    Keywords: Boson degeneracy and superfluidity of helium-4
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Summary Nucleation of vortices and strings is studied in superfluid helium in the context of phase transitions in this system. It is shown that the formation of these structures depends on the homotopy groups of the manifold of degenerate condensed states. The subsequent evolution of these structures is investigated and then impact on the superfluid nature of this system is analysed. The cross-section for the scattering of quasi-particles is estimated. This is exploited to find the effect of scatterings on the dynamics of shrinking vortex.
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Il nuovo cimento della Società Italiana di Fisica 14 (1992), S. 221-228 
    ISSN: 0392-6737
    Keywords: Boson degeneracy and superfluidity of helium-4
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Summary Coherent states in the roton region of superfluid He4 are studied with a view to determine the transition probability from phonon to roton states. These states are formed in such a way that they are found to be identical to those of the angular-momentum states.
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  • 4
    ISSN: 1432-0789
    Keywords: Co-selection ; Soil sterilization ; Effective cowpea rhizobia ; Vesicular arbuscular mycorrhizae ; Glomus pallidum ; Glomus aggregatum ; Sclerocystis microcarpa ; Vigna unguiculata
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary We selected two isolates of Rhizobium for cowpea (Vigna unguiculata) with sterilized soil tests and two different isolates by non-sterilized soil testing. The four rhizobia were then paired individually with either Glomus pallidum, Glomus aggregatum, or Sclerocystis microcarpa in separate, sterilized, or non-sterilized soil experiments. The purpose of the experiments was to determine the effect of soil sterilization on the selection of effective cowpea rhizobia, and to see whether these rhizobia differed in their effects on cowpea growth when paired with various vesicular-arbuscular mycorrhizal (VAM) fungi. Our experiments showed that the rhizobia selected in sterilized soil tests produced few growth responses in the cowpea compared to the other introduced rhizobia, irrespective of pairing with VAM fungi in sterilized or non-sterilized soil. In contrast, the two rhizobia initially selected by non-sterilized soil testing significantly improved cowpea growth in non-sterilized soil, especially when paired with G. pallidum. Our results suggest that it is important to select for effective rhizobia in non-sterilized soil, and that pairing these rhizobia with specific, coselected VAM fungi can significantly improve the legume growth response.
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  • 5
    ISSN: 1432-0789
    Keywords: Vesicular-arbuscular mycorrhizal fungi ; Rhizobia ; Glomus pallidum ; Glomus aggregatum ; Sclerocystis microcarpa ; Kidney bean ; Inoculation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract The effect of dual inoculation on three local cultivars (Miss Kelly, Portland Red, Round Red) of red kidney beans (Phaseolus vulgaris, L.) with four strains of Rhizobium leguminosarum bv. phaseoli and three species of vesicular-arbuscular mycorrhizal (VAM) fungi was examined in a clay loam soil. Rhizobial strains B 17 and B 36, each paired with Glomus pallidum or G. aggregatum, were the most effective pairings for cv. Miss Kelly. Inoculation of Miss Kelly with any of these pairings significantly (P=0.05) increased growth, number of nodules, nodule dry weight, mycorrhizal colonization, and shoot N and P content than other pairings. The growth response by cv. Portland Red was significantly improved by pairings of B 36 or B 17 with any of the three VAM fungi. For both cultivars (Miss Kelly and Portland Red), CIAT 652 or T 2 paired with VAM fungi did not give a positive growth response. In contrast, for cv Round Red the T 2 rhizobial strain in combination with any of the three VAM fungi showed a significant (P=0.05) growth improvement in all parameters. Our results suggest that while dual inoculation of VAM fungi and rhizobia significantly improves the growth response by red kidney beans, the best pairings of VAM fungus and rhizobia for each cultivar need to be carefully selected.
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