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  • Springer  (230)
  • Public Library of Science  (27)
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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Semigroup forum 60 (2000), S. 93-121 
    ISSN: 1432-2137
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Sexual plant reproduction 5 (1992), S. 280-285 
    ISSN: 1432-2145
    Keywords: Cabbage ; Female gametophyte irradiation ; Aneuploid plants ; Radiation (nuclear)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary We examined the prospects for using the female gametophyte irradiation technique in cabbage to reduce the number of generations needed for cytoplasm transfer. Three different crosses were used with one nuclear and two cytoplasmic male-sterile lines as female parents. The doses applied ranged from 100 to 700 Gy. Differences between the genotypes were observed only in embryo and plant production with varying dose. Several plants derived from the various experiments exhibited one or two recessive paternal markers and an aneuploid number of chromosomes, which shows an irradiation-induced loss of maternal chromosomes. However, no androgenetic haploid plant was obtained. The aneuploid plants could sometimes be backcrossed, and in one case a shift in the segregation ratio towards the paternal (non-irradiated) phenotype was observed. We concluded that while the female gametophyte irradiation technique could reduce the number of generations necessary for cytoplasm transfer, the damage induced seems too restricted for this technique to be applied in cabbage breeding at present.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Mathematische Zeitschrift 196 (1987), S. 189-201 
    ISSN: 1432-1823
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1432-203X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The introgression of new desirable characters is very necessary in common bean (Phaseolus vulgaris L.) Interspecific hybridization of P. vulgaris L. with P. angustissimus A. Gray, a wild species with narrow leaves, could be successfully achieved for the first time using embryo culture. Sixteen to twenty-three-day old embryos could grow to plantlets when they were cultivated on modified Monnier's medium. The leaf shape of the hybrid plants obtained showed intermediary traits between the two parents. A chromosome stock doubling could be achieved for one embryo.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Manuscripta mathematica 16 (1975), S. 169-193 
    ISSN: 1432-1785
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract The groundfield k is algebraically closed and of characteristic p ≠ O. The p-rank of an abelian variety A/k is σA if there are σA copies of Z/pZ in the group of points of order p in A(k). The p-rank σX of a curve X/k is the p-rank of its Jacobian. In general the genus of X is ≥ σX. X is ordinary if equality holds. Proposition 3.2 proves that the Artin-Schreier curve Xp with equation (xp−x)(yp−y)=1 is ordinary. As its genus is (p−1)(p−1) and it has at least 2p. p. (p−1) automorphisms, it is an ordinary counter example of Hurwitz's theorem if p〉37. Theorem 3.5 is the inductive step in extending this to smaller characteristics. Both are corollaries of Theorem 4.1 which is our principal result: if Y→X is a cyclic covering of degree p ramified at n distinct points, then (σY−1+n)=(σX−1+n)×p. The particular case n=0, the unramiried case, is due to Šafarevič [7].
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Naturwissenschaften 53 (1966), S. 387-388 
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Integral equations and operator theory 12 (1989), S. 470-485 
    ISSN: 1420-8989
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract LetX be a complex Banach space andA: D(A)→X a densely defined closed linear operator whose resolvent set contains the real line and for which ‖λ(λ−A)−1‖ is bounded onR. We give a necessary and sufficient condition, in terms of the complex powers ofA and −A, for the existence of a decompositionX=X +⊕X −, whereX ± are closed subspaces, invariant forA, the spectra of the reduced operatorsA ± are {λ∈σ(A);Imλ〉0} and {λ∈σ(A);Imλ〈0} respectively, and ‖λ(λ−A ±)−1‖ is bounded forImλ≶0. Finally we give an example of an operator in anL p-type space for which the decomposition exists if 1〈p〈+∞ and does not exist ifp=1.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Cellular and molecular life sciences 23 (1967), S. 675-675 
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Résumé Les semences deDrosophyllum lusitanicum Link, cultivées en milieu semi-solide de White (WB) et également dans des milieux auxquels on a ajouté de nombreux facteurs de croissance, n'ont pas germé, mais les embryons incisés ont commencé à germer tout de suite et ils se sont développés lorsqu'on les a semés sur le WB, et sur le WB + CH + IAA ou le WB + kinetin ou encore sur le WB + l'extrait de levure. Sur le WB + CH + CM, une callosité friable s'est produite. Celle-ci a été maintenue à travers plusieurs passages au cours de 18 mois. Une différentiation en pousses et racines a été observée dans 12% des tissus de calles sous-cultivés.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Il nuovo cimento della Società Italiana di Fisica 12 (1990), S. 453-468 
    ISSN: 0392-6737
    Keywords: Kinetic and transport theory ; Classical, semiclassical, and quantum theories of liquid structure ; Optical properties of bulk materials
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Riassunto Gli spettri di assorbimento indotto da collisioni (spettri CIA) forniscono informazioni sulle proprietà dinamiche di sistemi densi. Due semplici casi di spettri CIA vengono discussi: la banda traslazionale osservata in soluzioni di gas nobili in Ar liquido e le righe rotazionali dell'H2 osservate in soluzioni di H2 in Ar. Nel primo caso, l'analisi della banda traslazionale permette di ricavare la frequenza caratteristica ω0 associata alla componente oscillatoria del moto dell'impurezza nella matrice di Ar. Nel secondo caso, l'analisi delle righe rotazionali permette di derivare il parametro δ, che caratterizza l'effetto del restringimento di riga con la densità. Ad alte densità, il parametro δ è direttamente collegato al moto diffusivo degli atomi di Ar attorno alla impurezza.
    Abstract: Резюме Спектроскопия поглощения, индуцированного столкновениями, используется для исследования динамических свойств плотных систем. Обсуждаются два простых случая спектров поглощения, индуцированного столкновениями: трансляционная зона, набльденная в растворах инертного газа в жидком аргоне, и ротационные линии H2, наблюденные в растворах H2 в Ar. В первом случае анализ трансляционной зоны позволяет вывести характерную частоту ω0, связанную с компонентой движения примеси в аргоновой среде. Во втором случае анализ ротационных линий позволяет определить параметр δ, который характеризует эффект плотности. В области высоких плотностей параметр δ непосредственно свяан с диффузионным движением атомов аргона вокруг примеси.
    Notes: Summary Collision-induced absorption (CIA) spectroscopy is a probe of the dynamical properties of dense systems. Two simple cases of CIA spectra are here discussed: the translational band observed in solutions of a noble gas in liquid Ar and the rotational lines of H2 observed in solutions of H2 in Ar. In the first case, the analysis of the translational band allows one to derive the characteristic frequency ω0, associated with the rattling component of the motion of the impurity in the Ar medium. In the second case, the analysis of the rotational lines allows one to derive the parameter δ, that characterizes the density narrowing effect. In the high-density region, the parameter δ is directly related to the diffusive motion of the Ar atoms around the impurity.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Il nuovo cimento della Società Italiana di Fisica 12 (1990), S. 543-557 
    ISSN: 0392-6737
    Keywords: Classical, semiclassical, and quantum theories of liquid structure ; Neutron determination of structure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Riassunto Si presenta una breve rassegna delle caratteristiche di liquidi molecolari biatomici e tetraedrici.
    Notes: Summary A brief review is presented of the structural characteristics of diatomic and tetrahedral molecular liquids.
    Type of Medium: Electronic Resource
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