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  • 1
    Electronic Resource
    Electronic Resource
    .eta.5-C5Me5TiMe3-B(C6F5)3: A true Ziegler-Natta catalyst for the syndiotactic-specific polymerization of styrene (1995)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 117 (1995), S. 6593-6594 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja00129a024
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  • 2
    Electronic Resource
    Electronic Resource
    Regiospecificity of Ethylene-Styrene Copolymerization with a Homogeneous Zirconocene Catalyst (1995)
    s.l. : American Chemical Society
    Macromolecules 28 (1995), S. 4665-4667 
    Details
    ISSN: 1520-5835
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ma00117a043
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  • 3
    Electronic Resource
    Electronic Resource
    Alexandre Koyré versus Lucien Lévy-Bruhl: From Collective Representations to Paradigms of Scientific Thought (1995)
    Cambridge : Cambridge University Press
    Science in context 8 (1995), S. 531-555 
    Details
    ISSN: 0269-8897
    Source: Cambridge Journals Digital Archives
    Topics: History , Natural Sciences in General
    Notes: The ArgumentAlexandre Koyré is one of the most important historians of philosophic and scientific though since the thirties. Research on the Scientific Revolution, on Galileo, Descartes, Newton, as well as on Paracelsus and Boehme has deeply changed under his influential method: it has been a model for Kuhn's methodology of paradigms and revolutions in the histroy of science. Whereas Koyré used to be considered opposed in his ideology and method to sociological approaches, he has recently been characterized by Yehuda Elkana as a sociologist of knowledge. In fact, until now one of the main sources of his method had not been identified: it is only by acknowledging the influence of Lucien Lévy-Bruhl on Koyré that it is possible to explain how the latter wrote his thesis on Boehme's mystical thought just before his Etudes galiléennes. Lucien Lévy-Bruhl was teaching history of philosophy at the Sorbonne, and Koyré was strongly influenced by his idea of “prelogical thinking” as a universel phenomenon and in a general way by the sociological school of Durkheim. Conceptual analysis deriving from Husserl, collective representations and attitude mentale(the latter invented not by Lucien Febvre but by Lévy-Bruhl), came together in Alexandre Koyrè's method
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1017/S0269889700002155
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  • 4
    Electronic Resource
    Electronic Resource
    Loss of nucleolar organizer regions during chromosomal evolution in the South American cricetid Graomys griseoflavus (1996)
    Springer
    Genetica 98 (1996), S. 53-57 
    Details
    ISSN: 1573-6857
    Keywords: chromosomal evolution ; NOR ; South American rodent
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Graomys griseoflavus is a South American phyllotine rodent having a remarkable Robertsonian polymorphism which may have produced reproductive isolation between 2n=42−41 and 2n=38−34 karyomorphs. Analysis of nucleolar organizer region (NOR) locations both by silver staining (Ag-NOR) and in situ hybridization revealed that 2n=42 individuals exhibit highly variable Ag-NOR patterns, while specimens of the 2n=38−34 karyomorphic group showed a single Ag-NOR pattern. The latter animals underwent two NOR deletions in reference to the 2n=42 karyomorphs, one of which would be the consequence of a Robertsonian fusion and the other would be produced by the unequal crossing-over mechanism. The differential NOR homogenization supports the hypothesis that G. griseoflavus karyomorphs are evolving separately towards the acquisition of separate species status.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00120218
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  • 5
    Electronic Resource
    Electronic Resource
    Complex pathways in dissociative adsorption of oxygen on platinum (1997)
    [s.l.] : Macmillan Magazines Ltd.
    Nature 390 (1997), S. 495-497 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Gas adsorption on solid surfaces is the basis of heterogeneous catalysis. Gas–surface interactions may be complex and in many cases the fundamental mechanisms of the chemisorption process are hard to discern. The macroscopic kinetics of a heterogeneous catalytic reaction are usually ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/37329
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  • 6
    Electronic Resource
    Electronic Resource
    Molecular analysis of chromosomal polymorphism in the South American cricetid,Graomys griseoflavus (1995)
    Springer
    Chromosome research 3 (1995), S. 361-367 
    Details
    ISSN: 1573-6849
    Keywords: chromosomal polymorphism ; heterochromatin ; satellite DNA ; South American rodent
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Graomys griseoflavus is a South American phyllotine rodent widespread in Argentina that shows a high frequency of Robertsonian fusions (RFs). DNA restriction withEcoRI produced a 250-bp repeated family (EG250) specific for the genus. Southern hybridization and sequencing analysis indicate that the EG250 family is heterogeneous, comprising at least two subfamilies.In situ hybridized EG250 probe showed a centromere location in almost all chromosomes. In all karyomorphs C-banding was negative, but restriction enzyme banding (re-banding) withAluI andMboI showed centromeric blocks in the autosomes that will generate Robertsonian fusions. Thus, we found three groups of chromosomes: (a) EG250 and Re-banding negative; (b) EG250 positive and Re-banding negative; and (c) EG250 and Re-banding positive. We consider that group (b) is more the result of chromatin condensation state than that of the frequency of recognition sites for the enzymes used. Restriction enzyme blocks would appear in regions with heterochromatic EG250 subfamilies, while lack of banding would be due to decondensed EG250 subfamilies becoming an easier target for chromosomal restriction. It is suggested that heterochromatic EG250 DNA provides a favourable molecular environment for Robertsonian fusion occurrence.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00710017
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  • 7
    Electronic Resource
    Electronic Resource
    H2S gas treatment with Thiobacillus Ferrooxidans - process performance and stability (1996)
    Weinheim : Wiley-Blackwell
    Chemical Engineering & Technology - CET 19 (1996), S. 378-385 
    Details
    ISSN: 0930-7516
    Keywords: Chemistry ; Industrial Chemistry and Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The present paper deals with a novel hydrogen sulphide abatement process applying a combined chemical-biological process. The authors already dealt with this subject in the paper “Biotechnological H2S gas treatment with Thiobacillus ferrooxidans” [1], previously published in Chemical Engineering and Technology. This study, in particular, deals with over all process test runs in a laboratory scale plant with a single-stage immobilised biomass reactor.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ceat.270190412
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  • 8
    Electronic Resource
    Electronic Resource
    Syndiotactic-specific polymerization of propene with a Ni-based catalyst (1996)
    Weinheim : Wiley-Blackwell
    Macromolecular Rapid Communications 17 (1996), S. 333-338 
    Details
    ISSN: 1022-1336
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Polymerization of propene at -78°C in the presence of a homogeneous catalytic system based on a Ni(II) diimine derivative and methylaluminoxane affords prevailingly syndiotactic crystalline poly(propylene) (rr triad content ≈80%). 13C NMR analysis of the polymer microstructure indicates that the stereochemistry of the monomer insertion is controlled by the configuration of the methine carbon of the growing chain end (unlike-1,3 asymmetric induction). This is the first example of stereospecific homopolymerization of propene promoted by a late transition metal catalyst.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/marc.1996.030170508
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  • 9
    Electronic Resource
    Electronic Resource
    Copolymerization of styrene with (Z)-1,3-pentadiene in the presence of a syndiotactic-specific catalyst (1997)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 35 (1997), S. 2697-2702 
    Details
    ISSN: 0887-624X
    Keywords: Ziegler-Natta polymerization ; group 4 catalysts ; styrene-(Z)-1,3-pentadiene ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Copolymerization of styrene with (Z)-1,3-pentadiene affords copolymers mostly containing 1,2 pentadiene units. Both the styrene and the pentadiene units are in syndiotactic arrangement but the comonomer sequence distribution is far from bernoullian. Interestingly, the behavior of (Z)-1,3-pentadiene does not change much when polymerization temperature raises from -20 to +20°C, notwithstanding that (Z)-1,3-pentadiene affords a 1,2-syndiotactic homopolymer at -20°C but a prevailingly 1,4 cis homopolymer at +20°C. © 1997 John Wiley & Sons, Inc. J Polym Sci A: Polym Chem 35: 2697-2702, 1997
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Evaluation of the dimethylsilyl-bis(2-methyl-4-phenyl-1-indenyl) ligand with group 4 triad metals in propene polymerizations with methylaluminoxane (1998)
    Weinheim : Wiley-Blackwell
    Macromolecular Rapid Communications 19 (1998), S. 71-73 
    Details
    ISSN: 1022-1336
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Dimethylsilyl-bis(2-methyl-4-phenyl-1-indenyl)MCl2 (M = Ti, Zr, Hf) complexes in combination with methylaluminoxanes produce isotactic polypropene. The Ti catalysts produce isotactic polypropene which is more stereoregular than that obtained with traditional, heterogeneous catalysts. Zr produces low molecular weight, weakly isotactic waxes at phenomenal rates greater than 32 · 106 gPP/[(mol catalyst) · h · (mol/l monomer)]. Hf produces long, softer isotactic chains with good activities.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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