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  • 1
    Electronic Resource
    Electronic Resource
    The gravitational sector in the Connes–Lott formulation of the standard model (1995)
    College Park, Md. : American Institute of Physics (AIP)
    Journal of Mathematical Physics 36 (1995), S. 6255-6275 
    Details
    ISSN: 1089-7658
    Source: AIP Digital Archive
    Topics: Mathematics , Physics
    Notes: We studied the Riemannian aspect and the Hilbert–Einstein gravitational action of the noncommutative geometry underlying the Connes–Lott construction of the action functional of the standard model. This geometry involves a two-sheeted, Euclidian space–time. We show that if we require the space of forms to be locally isotropic and the Higgs scalar to be dynamical, then the Riemannian metrics on the two sheets of Euclidian space–time must be identical. We also show that the distance function between the two sheets is determined by a single, real scalar field whose vacuum expectation value (VEV) sets the weak scale. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.531243
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  • 2
    Electronic Resource
    Electronic Resource
    Switch (swi1), an Arabidopsis thaliana mutant affected in the female meiotic switch (2000)
    Springer
    Sexual plant reproduction 12 (2000), S. 209-218 
    Details
    ISSN: 1432-2145
    Keywords: Key words Arabidopsis thaliana ; Megasporogenesis ; Megagametogenesis ; Mitosis-meiosis switch
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  In this paper, we describe a novel plant mutant affected exclusively in the female mitosis-meiosis switch. The major effect of the swi1 mutation in Arabidopsis thaliana L. is to delay megasporogenesis events by inserting additional mitotic divisions of the mega- sporocyte. As a result of this delay, megagametogenesis is also affected. The absence of cellular polarity in the megasporocytes was also observed. Ovule ontogenesis is not affected by the mutation. The swi1 mutant is particularly interesting for studying sporophyt-gametophyte interactions. The swi1 mutation, obtained from a T-DNA tagging experiment, is monogenic recessive and mapped on chromosome five, at 16 cM from the yellow inflorescence marker.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004970050002
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  • 3
    Electronic Resource
    Electronic Resource
    Haemoglobin crystals in the midgut of the tick Ornithodorus moubata Murray (1977)
    [s.l.] : Nature Publishing Group
    Nature 266 (1977), S. 536-538 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] O. moubata porcinus ticks (males and females) were taken from the laboratory strain, fed on guinea-pigs and dissected at intervals after the blood meal (0, 2, 4, 6, 12, 15, 30, 85 and 200 d), in 0.7% NaCl solution (for X-ray diffraction and spectroscopy) or without a dissecting fluid (for ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/266536a0
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  • 4
    Electronic Resource
    Electronic Resource
    Supersymmetric Quantum Theory and Non-Commutative Geometry (1999)
    Springer
    Communications in mathematical physics 203 (1999), S. 119-184 
    Details
    ISSN: 1432-0916
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Notes: Abstract: Classical differential geometry can be encoded in spectral data, such as Connes' spectral triples, involving supersymmetry algebras. In this paper, we formulate non-commutative geometry in terms of supersymmetric spectral data. This leads to generalizations of Connes' non-commutative spin geometry encompassing non-commutative Riemannian, symplectic, complex-Hermitian and (Hyper-) Kähler geometry. A general framework for non-commutative geometry is developed from the point of view of supersymmetry and illustrated in terms of examples. In particular, the non-commutative torus and the non-commutative 3-sphere are studied in some detail.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002200050608
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  • 5
    Electronic Resource
    Electronic Resource
    Supersymmetric Quantum Theory and Differential Geometry (1998)
    Springer
    Communications in mathematical physics 193 (1998), S. 527-594 
    Details
    ISSN: 1432-0916
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Notes: Abstract: We reconsider differential geometry from the point of view of the quantum theory of non-relativistic spinning particles, which provides examples of supersymmetric quantum mechanics. This enables us to encode geometrical structure in algebraic data consisting of an algebra of functions on a manifold and a family of supersymmetry generators represented on a Hilbert space. We show that known types of differential geometry can be classified in terms of the supersymmetries they exhibit. Our formulation is tailor-made for a generalization to non-commutative geometry, which will be presented in a separate paper.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002200050339
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  • 6
    Electronic Resource
    Electronic Resource
    Higher levels of cell proliferation rate and cyclin CycD3 expression in the Arabidopsis amp1 mutant. (2000)
    Springer
    Plant growth regulation 32 (2000), S. 275-283 
    Details
    ISSN: 1573-5087
    Keywords: Cell proliferation ; Cyclin ; Cytokinin ; Mutant
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Cytokinins are involved in plant cell proliferation leading to plant growth and morphogenesis. The amp1 mutant of Arabidopsis has a five-fold higher level of cytokinin than the wild type plant. The mutant has a number of phenotypes with apparently increased cell proliferation rate similar to those seen in plants transformed with an ipt gene and having higher cytokinin levels. In order to identify molecular factors responsible for this cytokinin-induced higher cell division rate in the mutant we have examined cyclin genes expression levels. While expression of the CycD1 and cycC cyclins is not altered or is slightly decreased in the mutant, cyclin CycD3, is more highly expressed. The level of the CycD3 expression decreases in a “revertant” of amp1, meaning that the over-expression of this particular cyclin is linked to the phenotype of the amp1 mutant. Thus the expression of a specific G1 cyclin is upregulated in a mutant which has more cytokinin than the wild type.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1010716203798
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