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  • 1
    Digitale Medien
    Digitale Medien
    Dense Subsets of H1/2(S2, S1) (2000)
    Springer
    Annals of global analysis and geometry 18 (2000), S. 517-528 
    Details
    ISSN: 1572-9060
    Schlagwort(e): density problems ; Ginzburg–Landau functional ; minimal connections ; Sobolev maps between manifolds ; Sobolev spaces ; topological singularities ; trace spaces
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Mathematik
    Notizen: Abstract We prove that the maps from S 2 intoS 1 having a finite number of isolated singularities ofdegree ±1 are dense for the strong topology inH 1/2(S 2, S 1). We also prove that smooth maps are densein H 1/2(S 2, S 1)for the sequentially weak topology andthat this is no more the case in H s (S 2, S 1) for s〉 1/2.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1006655723537
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  • 2
    Digitale Medien
    Digitale Medien
    Resolutions of the prescribed volume form equation (1996)
    Springer
    Nonlinear differential equations and applications 3 (1996), S. 323-369 
    Details
    ISSN: 1420-9004
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Mathematik
    Notizen: Abstract For a given volume formfdx on a bounded regular domain Ω in IR n , we are looking for a transformationu of Ω, keeping the boundary fixed and which sends the Lebesgue measuredx intofdx (i.e. we solve det (Δu)=f. Forf in various spaces, we propose two different constructions which ensure the existence ofu with some gain of regularity. Our methods permit the recovery Dacorogna and Moser's results [4], but also, we prove the existence of suchu in Hölder spaces forf inC 0, or even inL ∞.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01194070
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  • 3
    Digitale Medien
    Digitale Medien
    Quantization effects for −Δu = u(1 − |u|2) in ℝ2 (1994)
    Springer
    Archive for rational mechanics and analysis 126 (1994), S. 35-58 
    Details
    ISSN: 1432-0673
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Mathematik , Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00375695
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  • 4
    Digitale Medien
    Digitale Medien
    Common features of three inversions in wheat chloroplast DNA (1988)
    Springer
    Current genetics 13 (1988), S. 343-349 
    Details
    ISSN: 1432-0983
    Schlagwort(e): Chloroplast DNA ; tRNA genes ; Gene duplication ; Inversion
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary We have determined the DNA sequences of regions involved in two of the three inversions known to have occurred during the evolution of wheat chloroplast DNA. This establishes the extent of the second largest of the three inversions. Examination of these sequences suggests that although short repeated sequences are present, the endpoints of the second and third inversions are not associated with repeated sequences as long as those associated with the first inversion. However the endpoints of all three inversions are all adjacent to at least one tRNA gene, and there is evidence that three of the tRNA genes have been subjected to partial duplication, possibly at the time of inversion. This suggests that tRNA genes might be involved with rearrangements of chloroplast DNA, as has also been postulated for mitochondrial DNA.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00424430
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  • 5
    Digitale Medien
    Digitale Medien
    The location and possible evolutionary significance of small dispersed repeats in wheat ctDNA (1986)
    Springer
    Current genetics 10 (1986), S. 931-941 
    Details
    ISSN: 1432-0983
    Schlagwort(e): T. aestivum ; Chloroplast DNA ; Repeat DNA ; Evolution
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary Low-stringency hybridisation between recombinant plasmids representing the complete T. aestivum chloroplast genome has revealed small repeated DNA segments dispersed through the molecule. Thirty-two repeated DNA segments were detected, and they could be divided into 12 unrelated sets; no repeat was detected as multiple copies. The longest of the small repeats mapped just within the large inverted repeat in spinach and mung-bean ctDNAs. It was found to have been duplicated after the divergence of a cereal progenitor to generate a third, dispensible copy, 0.2 kbp downstream of rbcL. In maize at least, this copy has also become integrated, with rbcL, in the mitochondrial genome. Another of the repeats is thought to have mediated a chloroplast DNA inversion (Howe 1985). Thus the diverse collection of small repeats probably represents some consequences and causes of past recombination events as well as a mechanism for further intramolecular ctDNA recombination. Their possible significance in the restructuring and evolution of chloroplast genomes is discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00398291
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  • 6
    Digitale Medien
    Digitale Medien
    In wheat ctDNA, segments of ribosomal protein genes are dispersed repeats, probably conserved by nonreciprocal recombination (1988)
    Springer
    Current genetics 14 (1988), S. 127-136 
    Details
    ISSN: 1432-0983
    Schlagwort(e): Wheat chloroplast DNA ; Repeated sequences ; Ribosomal protein genes ; Evolution
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary Some dispersed repeated sequences and their flanking regions from wheat and maize ctDNAs have been characterized. Two sets of wheat ctDNA repeats were found to be the chloroplast ribosomal protein genesrpl2 andrpl23, plus nonfunctional segments of them, designatedrpl2′ andrpl23′. Pairwise comparisons were made between the wheatrp123 andrpl23′, and the maizerp123′ sequences. The precise patterns of homology suggest that the divergence of the wheat and maize nonfunctional (rpl23′) sequences is being retarded by nonreciprocal recombination, biased by selection for individuals with functional (rpl23) sequences. The implied involvement of these sequences in mechanisms of homologous recombination, and therefore in the creation and spread of new ctDNA variants, is discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00569336
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  • 7
    Digitale Medien
    Digitale Medien
    Differential expression of the psbB and psbH genes encoding the 47 kDa chlorophyll a-protein and the 10 kDa phosphoprotein of photosystem II during chloroplast development in wheat (1991)
    Springer
    Current genetics 19 (1991), S. 199-206 
    Details
    ISSN: 1432-0983
    Schlagwort(e): Light regulation ; psbN ; Triticum aestivum ; Etioplast
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary The nucleotide sequence of a region of wheat chloroplast DNA containing the psbB gene for the 47 kDa chlorophyll a-binding protein of photosystem II has been determined. The gene encodes a polypeptide of 508 amino acid residues which is predicted to contain six hydrophobic membrane-spanning regions. The psbB gene is located 562 bp upstream of the psbH gene for the 10 kDa phosphoprotein of photosystem II. A small open reading frame of 38 codons is located between psbB and psbH, and on the opposite strand the psbN gene, encoding a photosystem II polypeptide of 43 amino acid residues, is located between orf38 and psbH. S1 nuclease mapping indicated that the 5′ ends of transcripts were located 371 and 183 bp upstream of the psbB translation initiation codon. Predominant transcripts of 2.1 kb and 1.8 kb for psbB and 0.4 kb for psbH were present in RNA isolated from etiolated and greening wheat seedlings. Immunodecoration of Western blots indicated that the 47 kDa polypeptide was absent, or present in very low amounts, in dark-grown tissue and accumulated on greening, whereas the 10 kDa polypeptide was present in similar amounts in both dark-grown and greening seedlings. The 10 kDa polypeptide was phosphorylated in vitro by incubating wheat etioplast membranes with [γ3 2P] ATP.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00336487
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  • 8
    Digitale Medien
    Digitale Medien
    A Remark on the Use of Differential Forms for the Skyrme Problem (1998)
    Springer
    Letters in mathematical physics 45 (1998), S. 229-238 
    Details
    ISSN: 1573-0530
    Schlagwort(e): calculus of variations ; skyrme energy particle physics ; skyrmion non-linear partial differential equations.
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Mathematik , Physik
    Notizen: Abstract We introduce a formulation of the Skyrme problem using differential forms. By means of this formulation, we prove first that the homothetic map between the standard three-sphere of radius R, S3 r ⊂ R4, and S3 1 is the unique minimizer, modulo isometries, of the Skyrme energy in its homotopy class, for any R less than some critical value R0 ∈ (√3/2, √2]. We then establish a stability result for this Skyrme-form problem from which we can recover the result of M. Loss and N. S. Manton which states that this homothetic map is stable only up to R = √2.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1007452315571
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  • 9
    Digitale Medien
    Digitale Medien
    Formation and magnetic properties of fractal aggregates of cobalt (1997)
    Springer
    JETP letters 66 (1997), S. 594-597 
    Details
    ISSN: 1090-6487
    Schlagwort(e): 61.43.Hv ; 75.50.Cc
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Macroscopic fractal aggregates of cobalt are obtained by thermal evaporation of cobalt metal in an argon atmosphere and subsequent deposition on a silicon substrate heated to 1000 K. It is established that the fractal structure is formed by diffusion-limited aggregation of cobalt particles. The macroscopic fractal cobalt aggregates are ferromagnetic.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1134/1.567551
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  • 10
    Digitale Medien
    Digitale Medien
    The complete matter sector in a three-generation compactification (1992)
    Springer
    Communications in mathematical physics 148 (1992), S. 57-100 
    Details
    ISSN: 1432-0916
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Mathematik , Physik
    Notizen: Abstract We consider a Calabi-Yau compactification paradigm with three light generations and anR-symmetry. From a special form of the Tian-Yau manifold, we also construct a new three-generation model with markedly different phenomenology. Thecomplete spectrum of all light matter fields is obtained in a universal way and moreover in a physically suitable basis, allowing a straightforward analysis of all their couplings. Here we discuss all the renormalizable Yukawa couplings. This computation can equally well be repeated for all compactification models based on Calabi-Yau complete intersections in products of homogeneous spaces.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02102365
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