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  • 1
    Electronic Resource
    Electronic Resource
    Commutation properties of cyclic and null Killing symmetries (1987)
    College Park, Md. : American Institute of Physics (AIP)
    Journal of Mathematical Physics 28 (1987), S. 2688-2691 
    Details
    ISSN: 1089-7658
    Source: AIP Digital Archive
    Topics: Mathematics , Physics
    Notes: In a space-time admitting cyclic and nonspacelike Killing symmetries the commutation properties of the Killing vectors are examined. It is shown that cyclic and null Killing vectors can be noncommuting only if a Killing vector of stationarity is also admitted. Two consequences of this commutativity are also discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.527712
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  • 2
    Electronic Resource
    Electronic Resource
    On singularity theorems and curvature growth (1987)
    College Park, Md. : American Institute of Physics (AIP)
    Journal of Mathematical Physics 28 (1987), S. 142-145 
    Details
    ISSN: 1089-7658
    Source: AIP Digital Archive
    Topics: Mathematics , Physics
    Notes: It is shown that the proofs of a series of classical singularity theorems of general relativity can be modified such that these theorems also state the maximality of the incomplete nonspacelike geodesics. Since along maximal incomplete nonspacelike geodesics with affine parameter u certain parts of the tidal curvature cannot blow up faster than (u¯−u)−2, where u¯ is the parameter value until which the geodesics cannot be extended, the classical singularity theorems do restrict the behavior of the curvature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.527796
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  • 3
    Electronic Resource
    Electronic Resource
    Fusion between interphase and mitotic plant protoplasts - Induction of premature chromosome condensation
    Amsterdam : Elsevier
    Experimental Cell Research 127 (1980), S. 442-446 
    Details
    ISSN: 0014-4827
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0014-4827(80)90450-4
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  • 4
    Electronic Resource
    Electronic Resource
    Uptake of isolated plant chromosomes by plant protoplasts (1981)
    Springer
    Planta 151 (1981), S. 141-145 
    Details
    ISSN: 1432-2048
    Keywords: Chromosome isolation ; Petroselinum ; Polyethylene-glycol ; Protoplast (uptake of chromosomes) ; Triticum ; Zea
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract For mass isolation of plant metaphase chromosomes, cultured cells of wheat (Triticum monococcum) and parsley (Petroselinum hortense) were synchronized by hydroxyurea and colchicine treatment. This synchronization procedure resulted in high mitotic synchrony, especially in suspension cultures of parsley in which 80% of the cells were found to be at the metaphase stage. Mitotic protoplasts isolated from these synchronized cell cultures served as a source for isolation of chromosomes. The described isolation and purification method yielded relatively pure chromosome suspension. The uptake of the isolated plant chromosomes into recipient wheat, parsley, and maize protoplasts was induced by polyethylene-glycol treatment. Cytological studies provided evidences for uptake of plant chromosomes into plant protoplasts.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00387815
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  • 5
    Electronic Resource
    Electronic Resource
    Regeneration of isolated mesophyll and cell suspension protoplasts to plants in Stylosanthes guianensis. A tropical forage legume (1986)
    Springer
    Plant cell reports 5 (1986), S. 174-177 
    Details
    ISSN: 1432-203X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Protoplasts were isolated from leaf mesophyll and cell suspensions of two accessions of Stylosanthes guianensis (Aubl.), a tropical forage legume. When cultured in VKM liquid culture medium, both types of protoplasts divided at a rate of 4–8%, and subsequently formed cell colonies. Protoplast-derived calluses produced numerous shoots when transferred to regeneration medium. Regenerated shoots could be easily rooted, and plantlets were transferred to soil. The effects of several factors on the efficiency of this protoplast system have been investigated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00269111
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  • 6
    Electronic Resource
    Electronic Resource
    Period changes of Cepheid variables (1983)
    Springer
    Astrophysics and space science 96 (1983), S. 185-194 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Secular period changes of one hundred northern Cepheids are investigated with the help of O−C diagrams. With the classical Cepheids the rate of observed period changes is in good agreement with that determined from stellar evolution theory. The period noise cannot mask the evolutionary period changes especially in longer period Cepheids for which the occurrence of parabolic O−C graphs is unusually frequent.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00661952
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  • 7
    Electronic Resource
    Electronic Resource
    Ibvs and the long-term monitoring of behaviour of variable stars (1994)
    Springer
    Experimental astronomy 5 (1994), S. 9-12 
    Details
    ISSN: 1572-9508
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Roles of the Information Bulletin on Variable Stars (IBVS) in servicing some of the information needs of observers of variable stars are briefly summarized.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01583804
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  • 8
    Electronic Resource
    Electronic Resource
    On the relation between causal structure and curvature (1982)
    Springer
    General relativity and gravitation 14 (1982), S. 891-897 
    Details
    ISSN: 1572-9532
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A space-time is both a Riemannian manifold and a causal space. These structures give restrictions on one another. In this paper we consider restrictions determined by the causal structure on the manifold's geometry. It is shown in particular that the conformai electric part of the curvature must satisfy interesting nonlocal conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00756804
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  • 9
    Electronic Resource
    Electronic Resource
    On the null geodesics from the viewpoint of space-time singularities (1983)
    Springer
    General relativity and gravitation 15 (1983), S. 187-194 
    Details
    ISSN: 1572-9532
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We examined the complete form of the propagation equation of the expansion for null geodesies and we found some restrictions in integral form on the Ricci and Weyl tensors near a singularity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00762477
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  • 10
    Electronic Resource
    Electronic Resource
    Causal measurability in chronological spaces (1987)
    Springer
    General relativity and gravitation 19 (1987), S. 1091-1100 
    Details
    ISSN: 1572-9532
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We show that the causal structure determines a volume measurability up to sets of zero measure. In space-time manifolds this causal measurability, apart from sets of zero measure, agrees with the a priori four-dimensional Lebesgue measurability, provided the strong causality condition holds.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00759145
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