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  • 1
    Electronic Resource
    Electronic Resource
    Evidence from Turner's syndrome of an imprinted X-linked locus affecting cognitive function (1997)
    [s.l.] : Macmillan Magazines Ltd.
    Nature 387 (1997), S. 705-708 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Turner's syndrome is a sporadic disorder of human females in which all or part of one X chromosome is deleted. Intelligence is usually normal but social adjustment problems are common. Here we report a study of 80 females with Turner's syndrome and a single X chromosome, in 55 of which the X ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/387705a0
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  • 2
    Electronic Resource
    Electronic Resource
    A study of females with deletions of the short arm of the X chromosome (1998)
    Springer
    Human genetics 〈Berlin〉 102 (1998), S. 507-516 
    Details
    ISSN: 1432-1203
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract We have undertaken a clinical and molecular study of 25 females with deletions of the short arm of the X chromosome. We have determined the deletion breakpoints, the parental origin and the activation status of the deleted X chromosomes. Genotype–phenotype correlations suggest that the presence of a single copy of the DFFRX gene, previously postulated as a gene involved in the ovarian failure seen in Turner syndrome, may be compatible with normal ovarian function, and that there may be a gene for Turner-like features located in distal Xp22.3.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004390050733
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  • 3
    Electronic Resource
    Electronic Resource
    Mechanism of the paring reaction of naphtenes (1996)
    Springer
    Catalysis letters 37 (1996), S. 207-212 
    Details
    ISSN: 1572-879X
    Keywords: bifunctional catalysis ; paring reaction ; 1-cyclohexyloctane ; naphtenes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract 1-cyclohexyloctane is isomerized on the large pore, bifunctional zeolite catalyst Pt/H-Y. The detailed isomerization mechanism of this naphtene molecule is revealed through a thorough analysis of the numerous isomerization products. It is found that methyl side-chains are generated on the ring of the molecule via a ring contraction-expansion mechanism, which are subsequently transferred to then-alkyl substituent via methyl shifts. Direct branching of then-alkyl chain is a much slower process compared to the generation of methyl substituents on the ring.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00807755
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  • 4
    Electronic Resource
    Electronic Resource
    A mathematical model for intracellular effects of toxins on DNA adduction and repair (1997)
    Springer
    Bulletin of mathematical biology 59 (1997), S. 89-106 
    Details
    ISSN: 1522-9602
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Mathematics
    Notes: Abstract The processes by which certain classes of toxic compounds or their metabolites may react with DNA to alter the genetic information contained in subsequent generations of cells or organisms are a major component of hazard associated with exposure to chemicals in the environment. Many classes of chemicals may form DNA adducts and there may or may not be a defined mechanism to remove a particular adduct from DNA independent of replication. Many compounds and metabolites that bind DNA also readily bind existing proteins; some classes of toxins and DNA adducts have the capacity to inactivate a repair enzyme and divert the repair process competitively. This paper formulates anintracellular dynamic model for one aspect of the action of toxins that form DNA adducts, recognizing a capacity for removal of those adducts by a repair enzyme combined with reaction of the toxin and/or the DNA adduct to inactivate the repair enzyme. This particular model illustrates the possible saturation of repair enzyme capacity by the toxin dosage and shows that bistable behavior can occur, with the potential to induce abrupt shifts away from steady-state equilibria. The model suggests that bistable behavior, dose and variation between individuals or tissues may combine under certain conditions to amplify the biological effect of dose observed as DNA aduction and its consequences as mutation. A model recognizing stochastic phenomena also indicates that variation in within-cell toxin concentration may promote jumps between stable equilibria.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02459472
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  • 5
    Electronic Resource
    Electronic Resource
    Clean catalytic technology for liquid phase hydrocarbon oxidation (1998)
    Springer
    Clean products and processes 1 (1998), S. 21-29 
    Details
    ISSN: 1436-722X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract  Liquid phase hydrocarbon oxidation is one of the principal routes towards industrial organic chemicals. However, low product selectivity and associated by-product formation are major problems in several oxidation processes. As a result of the increasingly stringent environmental regulations, the development of oxidation catalysts has been a major challenge in the last decade. An overview of novel selective and clean oxidation catalysts and processes is presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100980050004
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  • 6
    Electronic Resource
    Electronic Resource
    Oxidation catalysis with well-characterised vanadyl bis-bipyridine complexes encapsulated in NaY zeolite (1996)
    Springer
    Topics in catalysis 3 (1996), S. 437-449 
    Details
    ISSN: 1572-9028
    Keywords: oxidation catalysis ; zeolite ; vanadium complex ; XPS-CA ; EPR-DRS ; IR-Raman
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Vanadyl exchanged faujasite (VO2+-NaY) allows bipyridine complexation, giving a heterogeneous“ship-in-a-bottle” catalyst denoted as [VO(bpy)2]2+-NaY. The [VO(bpy)2]2+ complexes associated with the zeolite are characterised with FT-Raman, FT-IR, XPS, and diffuse reflectance spectroscopy (DRS), as well as with electron paramagnetic resonance (EPR). It is established that the cationic complexes are intrazeolitic and homogeneously distributed across the zeolite crystals and both the zeolite and the neutral bipyridine ligands stabilise VIV. The catalytic oxidation of cyclohexane and cyclohexene with different peroxides or mono-oxygen atom donors in presence of several solvents is described. Good epoxide selectivity results from the complexation by bipyridine thus favoring the heterolytic over the homolytic decomposition pathway of V-peroxo-intermediates.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02113866
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    Paper (German National Licenses)
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