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  • 1
    Electronic Resource
    Electronic Resource
    Resource partitioning by mammalian herbivores in the high Arctic (1994)
    Springer
    Oecologia 97 (1994), S. 439-450 
    Details
    ISSN: 1432-1939
    Keywords: Herbivory ; High Arctic ; Muskox ; Arctic hare ; Lemming
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Willow (Salix arctica) and sedges (Carex stans and Eriophorum triste) were the dominant plants available as forage for herbivores in the high Arctic of Greenland. Willow leaves were of high quality as forage in early stages, of phenology, but crude protein and digestibility declined markedly by late stages whereas sedges, remained high in forage quality throughout the growing season. Densities of fecal pellets indicated that muskoxen (Ovibos moschatus) made heaviest use of sedge-dominated vegetation types in both winter and summer, although increased use of willow communities was observed in early summer. Hares (Lepus arcticus) favored willow-dominated communities in both winter and summer. Evidence of collared lemming (Dicrostonyx groenlandicus) winter use was mainly in willow-dominated communities where snow had accumulated, whereas in summer they were present in drier habitas dominated by willows, but with greater plant diversity. Analyses of plant tissues in feces indicated that graminoids composed over 60% of the diet of muskoxen in winter and over 40% in summer. Willows were of nearly equal importance in the muskox diet in summer, and forbs, Dryas integrifolia, and moss collectively composed over 20% of the diet in both summer and winter. Grass accounted for nearly 50% of the diet of hares in both summer and winter, with willows, forbs, and moss accounting for most of the remainder. Willows and graminoids dominated the diet of lemmings, with willows being somewhat more important in summer and graminoids in winter. Moss was a noteworthy dietary component of lemmings. Differences in body and digestive-tract morphology among the three mammalian herbivores account for differences in locomotive efficiency, predator avoidance, and foraging efficiency which interact with vegetation quality, density, and patchiness. The resulting patterns of use of the landscape result in minimal overlap in use of forage resources and help to explain the distribution and co-existence of high Arctic herbivores.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00325880
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  • 2
    Electronic Resource
    Electronic Resource
    Production of Bacillus sphaericus larvicide on industrial peptones (1989)
    Springer
    Applied microbiology and biotechnology 30 (1989), S. 580-584 
    Details
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Summary A range of industrial peptones in combination with other carbon and nitrogen sources were investigated in order to define a medium for production of insecticide from Bacillus sphaericus, strain 2362. Industrial protein hydrolysates with an average peptide chain length above 30 were found to be poor substrates. Fermentation of B. sphaericus on protein-based media supplemented with glycerol resulted in production of 4–5x103 units of larvicide per ml fermentation broth, and toxicity of the larvicide up to 104 units per mg. Equally high larvicide production was obtained, when peptone was substituted with 30 mM l-glutamate and 2 mM proline. Addition of 2 mM l-arginine to this medium prevented sporulation and larvicide production.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00255363
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  • 3
    Electronic Resource
    Electronic Resource
    A balanced 13/18 translocation [46,XY,t(13q-; 18q+)] in the father of an infant with multiple anomalies (1971)
    Springer
    Human genetics 〈Berlin〉 12 (1971), S. 316-322 
    Details
    ISSN: 1432-1203
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary A 28-year-old man, whose infant son died of multiple malformations, was shown to have a balanced 13q-/18q+ translocation. He was phenotypically and mentally normal. Studies of the pedigree revealed the presence of bilateral microtia on the side of the spouse of the proband, transmitted in a dominant mode through four generations. Occasional cells from the proband and his mother exhibited an elongated long arm of a chromosome 16.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00278051
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  • 4
    Electronic Resource
    Electronic Resource
    Dark induced increase in pineal serotonin N-acetyltransferase activity: A refractory period (1973)
    Springer
    Cellular and molecular life sciences 29 (1973), S. 1339-1340 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Zusammenfassung Nachweis, dass Ratten, aus normaler Lichtperiode abrupt in Dunkelheit versetzt, keine Zunahme der NATase-Aktivität im Pinealorgan zeigen und dass Isoproterenol-Injektion die Zunahme der NATase auslöst.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01922804
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  • 5
    Electronic Resource
    Electronic Resource
    Comparative QTL mapping of resistance to Ustilago maydis across four populations of European flint-maize (1998)
    Springer
    Theoretical and applied genetics 97 (1998), S. 1321-1330 
    Details
    ISSN: 1432-2242
    Keywords: Key words Maize ; Ustilago maydis ; QTL mapping ; RFLP ; Resistance
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  We mapped and characterized quantitative trait loci (QTLs) for resistance to Ustilago maydis and investigated their consistency across different flint-maize populations. Four independent populations, comprising 280 F3 lines (A×BI), 120 F5 lines (A×BII), 131 F4 lines (A×C) and 133 F4 lines (C×D), were produced from four European elite flint inbreds (A, B, C, D) and genotyped at 89, 151, 104, and 122 RFLP marker loci, respectively. All Fn lines were evaluated in field trials with two replications in five German environments. Genotypic variances were highly significant for the percentage of U. maydis infected plants (UST) in all populations, and heritabilities exceeded 0.69. Between five and ten QTLs were detected in individual populations by composite interval mapping, explaining between 39% and 58% of the phenotypic variance. These 19 different QTLs were distributed over all ten chromosomes without any clustering on certain chromosomes. In most cases, gene action was dominant or overdominant. Fourteen pairs of the detected QTLs for UST displayed significant digenic epistatic interactions, but only two of them did so after arcsin √UST/100 transformation. Significant QTL× environment interactions occurred frequently. Between two to four QTLs were common between pairs of populations. Population C×D was also grown in Chartres, a location with a high U. maydis incidence. Two out of six QTLs identified for Chartres were in common with QTLs detected across five German environments for C×D. Consequently, marker-assisted or phenotypic selection based on results from natural infection seem to be suitable breeding strategies for improving the resistance of maize to U. maydis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001220051025
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  • 6
    Electronic Resource
    Electronic Resource
    A second quantized formulation of valence bond theory (1975)
    Springer
    Theoretical chemistry accounts 38 (1975), S. 341-354 
    Details
    ISSN: 1432-2234
    Keywords: Valence bond theory, second quantization formulation of ∼
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Valence bond theory is formulated in terms of second quantized operators and is related to the theory of the unitary group of spin-free orbital transformations. The construction of Weyl basis states, the evaluation of matrix elements, and the application to a linked-diagram valence bond perturbation theory are all discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00963472
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  • 7
    Electronic Resource
    Electronic Resource
    Conjugated circuit theory for graphite (1988)
    Springer
    Theoretical chemistry accounts 74 (1988), S. 349-361 
    Details
    ISSN: 1432-2234
    Keywords: Resonance theory ; Conjugated circuits ; Valence-bond theory ; Graphite ; Many-body theory
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Computations for the “conjugated circuits” model which has previously only been treated for finite and quasi-one-dimensional conjugatedπ-networks are here extended to the graphite lattice. Many-body techniques give the resultant resonance energy per site as a function of a physically relevant long-range order parameter.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01025838
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  • 8
    Electronic Resource
    Electronic Resource
    A note on the critical dimension for weakly self-avoiding walks (1988)
    Springer
    Probability theory and related fields 79 (1988), S. 99-114 
    Details
    ISSN: 1432-2064
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Summary We consider a weakly self-avoiding T-step random walk on Z dwith possible nonnearest neighbor jumps. We prove that for d≧3, the scaling limit of the end point is Cauchy distributed as T→∞.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00319107
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  • 9
    Electronic Resource
    Electronic Resource
    Wavefunction comparisons for the valence-bond model for conjugated π-networks (1986)
    Springer
    Theoretical chemistry accounts 69 (1986), S. 393-407 
    Details
    ISSN: 1432-2234
    Keywords: Valence-bond model ; π-Networks ; Heisenberg model ; Resonance theory ; Néel states ; Renormalization group ; Spin waves
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Approximate ground-state wavefunctions for valence-bond (or Heisenberg) models are obtained both within Néel-state-based and within Kekulé-state-based resonance-theoretic approaches. Comparisons are made between these and other general approaches, with particular emphasis on organic π-network systems. Attention is drawn to the manner in which the quality of the different approximation schemes changes with variations in structural characteristics of the system. It is suggested that resonance-theoretic ideas are most appropriate for (aromatic benzenoid) systems with low coordination number, whereas Néel-state based ideas are most appropriate for (3-dimensional) structures with higher coordination number (and little “frustration”).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00526699
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  • 10
    Electronic Resource
    Electronic Resource
    Extended π-networks with multiple spin-pairing phases: resonance-theory calculations on poly-polyphenanthrenes (1986)
    Springer
    Theoretical chemistry accounts 69 (1986), S. 369-391 
    Details
    ISSN: 1432-2234
    Keywords: π-network polymers ; Valence-bond model ; Resonance theory ; Long-range order ; Bond localization ; Solitonic excitations ; Transfer matrices
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The poly-polyphenanthrene family of extended π-network strips with members ranging from polyacetylene to graphite is considered in terms of the locally correlated valence-bond or Heisenberg Hamiltonian. Resonance theory wavefunctions which provide a variational upper bound to the ground state energy are developed in a graph-theoretic formalism extendable to more general localized wavefunction cluster expansions. The graph-theoretic formalism facilitates the use of general transfer matrix techniques, which are especially powerful in application to quasi-one-dimensional systems such as are illustratively treated here. It is argued that these strips exhibit states of different long-range spin-pairing orderings. Novel properties associated with these different resulting phases are briefly indicated, including the possibilities of solitonic excitations and the reactivity at the ends of the strips. The qualitative arguments are supported by numerical calculations for strips up to width 8.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00526698
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