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  • Articles  (77)
  • 1990-1994  (50)
  • 1975-1979  (22)
  • 1930-1934  (5)
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  • 1
    ISSN: 1439-0523
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Chromosomal assignment of three enzyme coding loci was established by evaluation of the segregation distortion in the offspring of crosses between heterozygous primary trisomics of a complete series in beet (Beta vulgaris) and heterozygous diploid pollinators. Depending on the rate of isozyme polymorphism in the original plant material, at least one, but more often two, crossing cycles were needed to obtain the desired segregating populations. In one case, a backcross was used to confirm the segregation distortion, and in two cases, the chromosomal assignment of the isozyme loci was confirmed by studying the dosage shift in the electrophoretic pattern of the critical trisomics. The isocitrate dehydrogenase locus (Icd1) is situated on chromosome II, the NAD-dependent malate dehydrogenase locus (Nad-Mdh1) on chromosome III, and the aconitase locus (Aco1) on chromosome IV.
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  • 2
    ISSN: 1439-0523
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Resistance to Polymyxa betae was studied in Beta species of the section Procumbentes, in hybrids of B. vulgaris with B. procumbens or B. patellaris, and in monosomic additions of chromosomes of B. procumbens in B. vulgaris. In all experiments P. betae infested with beet necrotic yellow vein virus (BNYVV) was used. This virus causes rhizomania in sugar beet, and the effect of vector resistance was studied by measuring virus concentrations. Cystosori of P. betae were not found in the wild species and the hybrids. Virus concentrations in these plants were low, and in half the number of plants the virus could not be detected. Results of experiments with the monosomic additions indicate, that resistance to P. betae in B. procumbens is located on chromosomes 4 and 8. Some cystosori were present in these addition types, while cystosori were abundantly present in other addition types and all sib-plants. Virus concentrations in the addition types 4 and 8 were lower than in their sib-plants, but in almost all plants the virus could be detected. A significant correlation (r = 0.91; P 〈 0.05) between average numbers of cystosori and average virus concentrations was found when addition families of type 8 were tested together with B. procumbens and B. vulgaris cv. ‘Regina’.
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 272 (1975), S. 223-226 
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract By means of a level crossing experiment the hyperfine structure constants of thez 6 P 7/2-level of Eu have been determined. The results areA=-6.51(6) MHz andB= 131.2(1.0) MHz in the isotope151Eu andA=-2.84(3) MHz andB=327.5(1.5) MHz in the isotope153Eu. Experimental data on the hyperfine splitting are available now for 11 of the 12 levels of the configuration 4f 7 (8S)6s 6p of EuI. These data are compared with the theoretical interpretation given by Bordarieret al. [1] which was based on only 7A-factors andB-factors. It is shown that the agreement between theory and experiment can be improved by taking into account configuration interactions.
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Applied physics 55 (1992), S. 126-131 
    ISSN: 1432-0649
    Keywords: 42.50.Tj ; 42.65.Pc
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A sodium-filled Fabry-Perot resonator shows many different types of irregular behavior. A sophisticated experimental apparatus allows reproducible measurements of oscillation scenarios leading to chaos and thus permits a detailed classification of the different phenomena. A quantitative explanation — featuring a new mechanism — for the best reproducible class of chaotic oscillations is given.
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  • 5
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Biological cybernetics 17 (1975), S. 145-156 
    ISSN: 1432-0770
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Computer Science , Physics
    Notes: Abstract We first show how to formalize environments in which situations can be changed only by action, and in which a situation should be brought about that is acceptable. This leads us to the concept of a problem constellation that consists of an action system, a reaction system, a judgement system, and an initial situation. We then present a cybernetical system which we call Robbimat. It is capable of testing problem constellations, of modifying them according to the results of the tests, and of judging the final constellation. We designed Robbimat in order to have favourable problem constellations automatically generated. As an example we discuss a simple game. It constitutes a win-loss-environment the structure of which can be deduced from the payoff function. We show how Robbimat analyses such an environment, and utilizing its structure classifies the initial situation.
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Naturwissenschaften 22 (1934), S. 728-730 
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
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  • 8
    ISSN: 1432-2242
    Keywords: Primary trisomies ; Beet ; Beta vulgaris ; Isozyme polymorphism ; Chromosomal assignment ; Distorted segregation ; Dosage shift
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Segregating families of beet (Beta vulgaris) were used to verify the monofactorial inheritance of two enzyme-coding loci, leucine aminopeptidase (Lap1) and glutamate oxaloacetate transaminase (Got3). With a series of primary trisomies and using three methods to discriminate between the critical trisomic (the locus is situated on the triplicated chromosome) and the non-critical ones, it was possible to allocate the two loci to beet chromosomes I and II, respectively. For the locus Lap1 distorted segregation ratios were estimated, and the incorporation of three alleles into one plant was attempted. In the case of Got3 the measurement of the allele dosage effect after electrophoresis was chosen as the major strategy. The output of laser densitometric scans were subjected to the non-parametrical Wilcoxon-Mann-Whitney test.
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  • 9
    ISSN: 1432-2242
    Keywords: Molecular markers Beet cyst nematode resistance ; Hs1 Heterodera schachtii Schm ; Satellite DNA Monosomic fragment additions Beta ; Pulsed-field gel electrophoresis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract New members of a satellite DNA family (Sat 121), specific for wild beets of the section Procumbentes of the genus Beta, were isolated. Sequence analysis showed that the members of Sat-121 fall into two distinct classes. The organization of Sat-121 in the vicinity of a beet cyst nematode (Heterodera schachtii Schm.) resistance locus (Hs1) in B. patellaris and B. procumbens was investigated by pulsed-field gel electrophoresis (PFGE) using DNA from a series of resistant monosomic fragment additions, each containing an extra chromosome fragment of B. patellaris chromosome-1 (pat-1) in B. vulgaris. In this way several clusters of Sat-121 flanking the Hs1 pat-1 locus were identified. In nematode resistant diploid introgressions (2n=18), which contain small segments of B. procumbens chromosome-1 (pro-1) in B. vulgaris, only two major Sat-121 clusters were detected near the Hs1 pro-1 locus.
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Cell & tissue research 157 (1975), S. 115-124 
    ISSN: 1432-0878
    Keywords: Cerebellar cortex ; Man and other mammals ; Number of cells ; Evolution of cerebellar cortex ; Quantitative analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The number of cells per unit volume was determined in the cerebellar cortex of man and 19 other mammals. The cell density (i.e. the number of cells per unit volume) decreases from mammals with a low brain weight to those with a higher brain weight. This decrease in the number of cells is found to be proportional for all three layers of the cerebellar cortex. In addition, the ratio of Purkinje cells to granule cells was determined. In contrast to the decrease of all cell types with increasing brain weight, this ratio varies remarkably among the mammals and is not correlated with brain weight. In man, this ratio is 1∶2991, while it is lower in all other mammals investigated. These differences in the ratio of Purkinje cells to granule cells and the decrease in cell density with increasing brain weight are discussed in relation to brain evolution.
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