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  • Springer  (560)
  • American Chemical Society (ACS)
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  • 11
    Electronic Resource
    Electronic Resource
    How We Happened to Measure g–2: A Tale of Serendipity (2000)
    Springer
    Physics in perspective 2 (2000), S. 135-140 
    Details
    ISSN: 1422-6960
    Keywords: Key words. Electron spin; electron magnetic moment; electron g-factor; electron gyromagnetic ratio; electron polarization; University of Michigan.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. A first-person account is given of the serendipitous route leading to the most accurate measurement of the gyromagnetic ratio or g-factor of the electron at the University of Michigan in the early 1950s.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s000160050040
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  • 12
    Electronic Resource
    Electronic Resource
    2-d physics and 3-d topology (1991)
    Springer
    Communications in mathematical physics 135 (1991), S. 615-640 
    Details
    ISSN: 1432-0916
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Notes: Abstract Invariants of three dimensional manifolds and of framed oriented labeled links in them are rigorously defined using any solution to the Moore-Seiberg axioms for a Rational Conformal field theory. These invariants are generalizations of Witten's Chern-Simons path integrals. Connections are explored with supersymmetry, four dimensional manifolds, and quantum gravity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02104124
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  • 13
    Electronic Resource
    Electronic Resource
    Super Riemann surfaces: Uniformization and Teichmüller theory (1988)
    Springer
    Communications in mathematical physics 113 (1988), S. 601-623 
    Details
    ISSN: 1432-0916
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Notes: Abstract Teichmüller theory for super Riemann surfaces is rigorously developed using the supermanifold theory of Rogers. In the case of trivial topology in the soul directions, relevant for superstring applications, the following results are proven. The super Teichmüller space is a complex super-orbifold whose body is the ordinary Teichmüller space of the associated Riemann surfaces with spin structure. For genusg〉1 it has 3g-3 complex even and 2g-2 complex odd dimensions. The super modular group which reduces super Teichmüller space to super moduli space is the ordinary modular group; there are no new discrete modular transformations in the odd directions. The boundary of super Teichmüller space contains not only super Riemann surfaces with pinched bodies, but Rogers supermanifolds having nontrivial topology in the odd dimensions as well. We also prove the uniformization theorem for super Riemann surfaces and discuss their representation by discrete supergroups of Fuchsian and Schottky type and by Beltrami differentials. Finally we present partial results for the more difficult problem of classifying super Riemann surfaces of arbitrary topology.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01223239
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  • 14
    Electronic Resource
    Electronic Resource
    Global properties of supermanifolds (1985)
    Springer
    Communications in mathematical physics 100 (1985), S. 141-160 
    Details
    ISSN: 1432-0916
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Notes: Abstract We construct new examples of supermanifolds, and determine the vector bundle structure of the supermanifolds commonly used in physics. We show that any supermanifold admits a foliation whose leaves are locally tangent to the soul directions in the coordinate charts, and which is one of a nested sequence of foliations. We point out that the existence of these foliations implies restrictions on the possible topologies of supermanifolds. For example, a compact supermanifold with a single even dimension must have vanishing Euler characteristic. We also show that a globally defined superfield on a “nice” compact supermanifold must be constant along the leaves of the foliations. By this mechanism, the global topology of a supermanifold can be used to impose physically interesting constraints on superfields. As an example, we exhibit a supermanifold which has the local geometry of flat superspace but is such that all globally defined superfields are chiral.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01212690
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  • 15
    Electronic Resource
    Electronic Resource
    How different are the supermanifolds of Rogers and DeWitt? (1985)
    Springer
    Communications in mathematical physics 102 (1985), S. 123-137 
    Details
    ISSN: 1432-0916
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Notes: Abstract A DeWitt supermanifold always has the structure of a vector bundle over an ordinary spacetime manifold, whereas a Rogers supermanifold is not so restricted. Corresponding to the vector space fibers of the DeWitt supermanifold, a Rogers supermanifold has a foliation by submanifolds, or leaves, parametrized by soul coordinates only. We show that the universal covering space of any leaf always admits a flat metric. If the covering space is complete in this metric, it must in fact be a vector space. We combine this result with known theorems about foliations to give conditions under which a compact Rogers supermanifold with a single even dimension is necessarily a quotient space of flat superspace. We also show that a supermanifold defined by a polynomial equation in flat superspace is always of the DeWitt type. Finally, we exhibit new supermanifold structures forR 2 and the 2-torus which show that the foliation of a Rogers supermanifold can be quite exotic.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01208823
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  • 16
    Electronic Resource
    Electronic Resource
    Distribution of 5S and 18S-28S rDNA loci in a tetraploid cotton (Gossypium hirsutum L.) and its putative diploid ancestors (1996)
    Springer
    Chromosoma 105 (1996), S. 55-61 
    Details
    ISSN: 1432-0886
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract. The most widely cultivated species of cotton, Gossypium hirsutum, is a disomic tetraploid (2n=4x=52). It has been proposed previously that extant A- and D-genome species are most closely related to the diploid progenitors of the tetraploid. We used fluorescent in situ hybridization (FISH) to determine the distribution of 5S and 18S-28S rDNA loci in the A-genome species G. herbaceum and G. arboreum, the D-genome species G. raimondii and G. thurberi, and the AD tetraploid G. hirsutum. High signal-to-noise, single-label FISH was used to enumerate rDNA loci, and simultaneous, dual-label FISH was used to determine the syntenic relationships of 5S rDNA loci relative to 18S-28S rDNA loci. These techniques provided greater sensitivity than our previous methods and permitted detection of six new G. hirsutum 18S-28S rDNA loci, bringing the total number of observed loci to 11. Differences in the intensity of the hybridization signal at these loci allowed us to designate them as major, intermediate, or minor 18S-28S loci. Using genomic painting with labeled A-genome DNA, five 18S-28S loci were localized to the G. hirsutum A-subgenome and six to the D-subgenome. Four of the 11 18S-28S rDNA loci in G. hirsutum could not be accounted for in its presumed diploid progenitors, as both A-genome species had three loci and both D-genome species had four. G. hirsutum has two 5S rDNA loci, both of which are syntenic to major 18S-28S rDNA loci. All four of the diploid genomes we examined contained a single 5S locus. In G. herbaceum (A1) and G. thurberi (D1), the 5S locus is syntenic to a major 18S-28S locus, but in G. arboreum (A2) and G. raimondii (D5), the proposed D-genome progenitor of G. hirsutum, the 5S loci are syntenic to minor and intermediate 18S-28S loci, respectively. The multiplicity, variation in size and site number, and lack of additivity between the tetraploid species and its putative diploid ancestors indicate that the behavior of rDNA loci in cotton is nondogmatic, and considerably more complex and dynamic than previously envisioned. The relative variability of 18S-28S rDNA loci versus 5S rDNA loci suggests that the behavior of tandem repeats can differ widely.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004120050159
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  • 17
    Electronic Resource
    Electronic Resource
    New ribosomal RNA gene locations in Gossypium hirsutum mapped by meiotic FISH (1999)
    Springer
    Chromosoma 108 (1999), S. 200-207 
    Details
    ISSN: 1432-0886
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract. In this study we have mapped newly identified rDNA loci in Gossypium hirsutum. Four new minor 18S-26S rDNA loci, in addition to the sites previously identified, were mapped using fluorescence in situ hybridization (FISH) to heterozygous translocation (NT) quadrivalents (IVs). The newly detected 18S-26S rDNA loci were mapped to the right arms of chromosomes 8, 9, 15, 17, 19, 20, and 23 and the left arms of chromosomes 5, 11, 12, and 14. Using the rDNA loci as common reference points, we detected several erroneous arm assignments in the previously published map of NT breakpoints. The data are summarized in the form of an integrated map for all 17 known rDNA loci, relative to centromeres, telomeres, and NT breakpoints. This information will facilitate future locus-specific research on rRNA gene evolution and function.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004120050369
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  • 18
    Electronic Resource
    Electronic Resource
    Action of the loop group on the self dual Yang-Mills equation (1987)
    Springer
    Communications in mathematical physics 110 (1987), S. 391-414 
    Details
    ISSN: 1432-0916
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Notes: Abstract Recently Kac-Moody symmetry has played an important role in mathematical physics. Dolan and Chau, Ge and Wu discovered an infinitesimal action of the Kac-Moody Lie algebra on the space of solutions of SDYM. We have discovered an action of the loop group on the space of generalized solutions of SDYM, which exponentiates the Kac-Moody action. The group acts by adding a special type of source onto the solution. The action is a geometric construction using the twistor picture.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01212419
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  • 19
    Electronic Resource
    Electronic Resource
    Analysis of Rayleigh-Lamb wave scattering by a crack in an elastic plate (1997)
    Springer
    Computational mechanics 19 (1997), S. 533-537 
    Details
    ISSN: 1432-0924
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract This paper considers the scattering of low-frequency elastic waves by a crack in a plate. A simple formula is derived for the reflection coefficient which serves as a lower bound to the reflection coefficient at higher frequencies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004660050205
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  • 20
    Electronic Resource
    Electronic Resource
    The Pichia pastoris HIS4 gene: nucleotide sequence, creation of a non-reverting his4 deletion mutant, and development of HIS4-based replicating and integrating plasmids (1994)
    Springer
    Current genetics 26 (1994), S. 443-450 
    Details
    ISSN: 1432-0983
    Keywords: Histidinol dehydrogenase ; Phosphoribosyl-AMP cyclohydrolase ; Phosphoribosyl-ATP pyrophosphohydrolase ; Transformation system ; Selectable marker
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract We have obtained a clone of the Pichia pastoris HIS4 gene and have determined its nucleotide sequence. Based upon its deduced amino-acid sequence, the product of the P. pastoris HIS4 gene has the same structural organization as the Saccharomyces cerevisiae His4 protein and appears to encode a trifunctional enzyme catalyzing the second (phosphoribosyl-ATP pyrophosphohydrolase), third (phosphoribosyl-AMP cyclohydrolase), and tenth (histidinol dehydrogenase) steps in histidine biosynthesis. The chromosomal copy of the HIS4 gene was disrupted by homologous recombination, creating the strain SGY58. The his4Δ deletion mutation in this strain lacks the entire coding region of this gene and has a reversion rate that is undetectable. A set of complementary plasmids that carry the HIS4 gene was also developed. Among these are nine E. coli-P. pastoris shuttle vectors that transform the His4Δ deletion mutant at high efficiency and an integration vector for creating site-specific alterations of the P. pastoris genome.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00309932
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