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  • Springer  (95)
  • 1980-1984  (94)
  • 1950-1954  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Reactivity of 6-methyl and 4,7-dimethyl indene in cationic polymerization (1981)
    Springer
    Polymer bulletin 4 (1981), S. 669-675 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary The reactivity ratios of 6-methyl and 4,7-dimethyl indene were determined with respect to styrene, at various temperatures, and the relative activation parameters calculated and discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00255415
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  • 2
    Electronic Resource
    Electronic Resource
    Towards an alternative evolution model (1982)
    Springer
    Acta biotheoretica 31 (1982), S. 3-28 
    Details
    ISSN: 1572-8358
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract. Lamarck and Darwin agreed on the inconstancy of species and on the exclusive gradualism of evolution (nature does not jump). Darwinism, revived as neo-Darwinism, was almost generally accepted from about 1930 till 1960. In the sixties the evolutionary importance of selection has been called in question by the neutralists. The traditional conception of the gene is disarranged by recent molecular-biological findings. Owing to the increasing confusion about the concept of genotype, this concept is reconsidered. The idea of the genotype as a cluster of genes is replaced by a cybernetical interpretation of the genotype. As nature does jump, exclusive gradualism is dismissed. Saltatory evolution is a natural phenomenon, provoked by a sudden collapse of the thresholds which resist against evolution. The fossil record and the taxonomic system call for a macromutational interpretation. As Lamarck and Darwin overlooked the resistance of evolutionary thresholds, an alternative evolution model is needed, the first to be constructed on a palaeontological and taxonomic basis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00048087
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  • 3
    Electronic Resource
    Electronic Resource
    Enantioselektive Cyclopropanierung von 1,1-Diphenylethylen und Diazoessigester mit Kupfer-Katalysatoren (1984)
    Springer
    Monatshefte für Chemie 115 (1984), S. 1237-1254 
    Details
    ISSN: 1434-4475
    Keywords: Catalytic enantioselective cyclopropanation ; Copper (II) catalysts ; Optical induction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Copper(II) compounds catalyze the reaction of 1,1-diphenylethylene with diazoacetic acid ethylester. The main product is 2,2-diphenylcyclopropane carboxylic acid ethylester. The formation of the carbene dimerization products fumaric and maleic acid diethylester can be suppressed by the continuous addition of diazoacetic acid ester to 1,1-diphenylethylene. 37 optically active ligands, partly new, were combined with copper(II)-acetate to givein-situ-catalysts. In five cases isolated copper complexes were used as catalysts. The best optical inductions in the formation of 2,2-diphenylcyclopro-pane carboxylic acid ethylester with up to 65.6% ee were achieved withSchiff base ligands, which derive from salicylaldehyde and amino alcohols, obtained from amino acid esters and phenylGrignard.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00809355
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  • 4
    Electronic Resource
    Electronic Resource
    A note on the Goodman Jack (1982)
    Springer
    Rock mechanics and rock engineering 15 (1982), S. 57-66 
    Details
    ISSN: 1434-453X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying , Geosciences
    Notes: Summary A Note on the Goodman Jack Reconnaissance experiments, performed to evaluate the practical utility of the hard-rock variety of the Goodman Jack, reveal that the Hustrulid-T* correction adequately reconciles the discrepancy between the measured and true deformation modulus of the rock mass in the range of 30 to 50 gigapascals.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01246885
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  • 5
    Electronic Resource
    Electronic Resource
    Mouvements périodiques d'une corde vibrante en présence d'un obstacle rectiligne (1980)
    Springer
    Zeitschrift für angewandte Mathematik und Physik 31 (1980), S. 473-482 
    Details
    ISSN: 1420-9039
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Description / Table of Contents: Abstract A string fixed at both ends oscillates in a plane in which there is a fixed straight line segment, parallel to the line joining the ends of the string. The string can rebound from the solid segment. The string is initially at rest, with prescribed shape. We prove that depending on the prescribed intial form of the string the motion is either periodic or aperiodic, and in the former case we compute the period.
    Notes: Résumé Une corde fixée à ses deux extrémités peut vibrer dans un plan en présence d'un obstacle rectiligne, fixe, parallèle au segment qui joint ses extrémités. La corde peut rebondir sur l'obstacle. La corde est initialement au repos, placée suivant une certaine courbe. On démontre que, suivant la choix de cette courbe, le mouvement est périodique ou non, et, lorsque le mouvement est périodique, on calcule la période.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01590858
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  • 6
    Electronic Resource
    Electronic Resource
    Sur une extension d'un théorème de Radó (1952)
    Springer
    Mathematische Annalen 125 (1952), S. 49-50 
    Details
    ISSN: 1432-1807
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01343105
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  • 7
    Electronic Resource
    Electronic Resource
    Effects of hydroxyurea and benzo(a)pyrene on DNA synthesis in the isolated perfused rat lung (1982)
    Springer
    Bulletin of environmental contamination and toxicology 28 (1982), S. 135-140 
    Details
    ISSN: 1432-0800
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01608565
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  • 8
    Electronic Resource
    Electronic Resource
    Cloned ß-galactosidase gene of Escherichia coli is expressed in the yeast Saccharomyces cerevisiae (1980)
    Springer
    Current genetics 2 (1980), S. 109-113 
    Details
    ISSN: 1432-0983
    Keywords: Recombinant DNA ; 2 µm DNA ; Heterologous gene expression ; Eukaryotic host
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The expression of the lacZ gene of E. coli in S. cerevisiae has been studied. The enzymatic activity coded by the lacZ gene in E. coli, β-galactosidase, is detectable in yeast cells harboring a chimeric plasmid carrying the gene. On the basis of size and immunological criteria, no difference was detected between the Coli-in-yeast β-galactosidase and the E. coli enzyme.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00420622
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  • 9
    Electronic Resource
    Electronic Resource
    Unconvincing evidence against the blocking temperature concept? (1982)
    Springer
    Contributions to mineralogy and petrology 80 (1982), S. 391-394 
    Details
    ISSN: 1432-0967
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00378012
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  • 10
    Electronic Resource
    Electronic Resource
    Hydrierung prochiraler Olefine mit Rhodium-Komplexen von optisch aktiven Amidinen (1980)
    Springer
    Monatshefte für Chemie 111 (1980), S. 275-287 
    Details
    ISSN: 1434-4475
    Keywords: Catalytic asymmetric hydrogenation ; Optical induction ; Rh/amidine complexes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract [RhCl(C8H14)2]2 together with the optically active amidines C6H5C(=NR)NHCH(CH3) (C6H5) I–V or their Li derivatives after activation with molecular hydrogen gives catalysts which at room temperature and 1.1 bar H2-pressure hydrogenate the prochiral substrates (Z)-α[N-acetylamino]-cinnamic acid, itaconic acid, α-methylcinnamic acid, α-methylcinnamic aldehyde, and α-methylcinnamic alcohol as well as cyclohexene, benzene and toluene. Good hydrogenation activity of the new catalysts is in contrast to low optical induction which only in the hydrogenation of α-methylcinnamic alcohol with 1.5 to 2% leads to values different from zero.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00938734
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