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  • 1
    Electronic Resource
    Electronic Resource
    Korrosionskennzeichnung von Kupferlegierungen - Polarisationswiderstände in Salzlösungen - (1970)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 21 (1970), S. 332-335 
    Details
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Characterization of the corrosion behaviour of copper alloys - polarisation resistances in salt solutionsExperiments with electrolyte copper, Cu with 6% Fe and CuNi90/10 (with Fe or Cr) demonstrate that measured polarisation resistances enable on principle conclusions to be drawn with respect to the probable corrosion behaviour of Cu alloys. This applies in particular to aerated solutions where the negative influence of Cr and the positive influence of Fe can be clearly distinguished. The variation of polarisation resistance with time enables groupes of alloys to be differentiated which initially are characterized by identical kinetic parameters.
    Notes: Versuche mit E-Cu, Cu mit 6% Fe, CuNi 90/10 (mit Fe oder Cr) in 3% NaCl zeigen, daß die Messung des Polarisationswiderstandes grundsätzlich Aussagen über das Korrosionsverhalten von C-Legierungen ermöglicht. Dies gilt vor allem für belüftete Lösungen, in denen der negative Einfluß von Cr und der Positive Einfluß von Fe deutlich erkennbar werden. Die zeitliche Änderung des Polarisationswiderstandes ermöglicht die Differenzierung von Legierungsgruppen, die anfangs gleiche kinetische Parameter aufweisen.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/maco.19700210504
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  • 2
    Electronic Resource
    Electronic Resource
    High 1,4-cis-polybutadiene by uranium catalyst. III. Strain induced crystallization and processability (1976)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 50 (1976), S. 87-99 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Die Strömungskristallisation von 1,4-cis-Polybutadien, einschließlich einer Probe mit extrem hohem cis-Gehalt, dargestellt in Gegenwart eines Uran-Katalysators, wurde in einem Kapillarrheometer untersucht. Der Einfluß von Temperatur, Druck und Schergeschwindigkeit auf die Strömungskristallisation wurde bestimmt und mit den Verhältnissen im Strömungsfeld eines Walzwerks verglichen. Es wird gezeigt, daß die Verarbeitabarkeit auf dem Walzwerk wesentlich verbessert wird, wenn die Bedingungen eine Kristallisation des Materials begünstigen. Die Molekulargewichtsverteilung spielt nur eine untergeordnete Rolle für die Polybutadiene mit höchstem cis-Gehalt. Die Gründe für die Beziehung zwischen Kristallisierbarkeit und Verarbeitbarkeit auf der Walze werden kurz diskutiert.
    Notes: The crystallization in flow of various 1,4-cis-polybutadienes, including an extremely high cis-polybutadiene content obtained with uranium catalyst, has been studied in a capillary rheometer. The influence on the crystallization in flow of temperature, pressure, shear rate has been investigated and compared with the conditions in the flow field of a roll-mill. It is shown that when these conditions are suitable for inducing, the crystallization of the rubber, the processability at the roll-mill is substantially improved. The molecular weight distribution plays only a minor role for the highest cistactic polybutadienes. The reason of the correlation between crystallization and roll-mill processability is briefly discussed.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1976.050500109
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  • 3
    Electronic Resource
    Electronic Resource
    High 1,4-cis-polybutadiene by uranium catalyst. IV. Stretch induced crystallization and ultimate properties (1976)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 50 (1976), S. 101-113 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Die Dehnungseigenschaften im Ungleichgewicht von Polybutadien mit hohem cis-Gehalt, dargestellt in Gegenwart eines Katalysators auf Uran-Basis, werden im Vergleich zu anderen Polybutadienen mit geringerer sterischer Reinheit untersucht. Die Bedingungen für die spannungsindizierte Kristallisation werden beschrieben. Es wird gezeigt, daß die Eigenschaften des Polymeren und die spannungsinduzierte Kristallisation unmittelbar in Beziehung stehen; ihre Abhängigkeit vom cis-Gehalt wird diskutiert. Die höhere sterische Reinheit des mit einem Uran-Katalysator erhaltenen Polybutadiens bedingt seine überragenden Eigenschaften.
    Notes: Non-equilibrium tensile properties of high-cis-polybutadiene obtained from an uranium based catalyst are evaluated in comparison with other polybutadienes having lower sterical purity. The conditions for incipient stretch induced crystallization are described. Ultimate properties and strain induced crystallization are found strongly related and their dependence on cis-content is discussed. The higher sterical purity accounts for the best performance of uranium polybutadiene.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1976.050500110
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  • 4
    Electronic Resource
    Electronic Resource
    The interaction of organotins with native DNA (1992)
    New York, NY [u.a.] : Wiley-Blackwell
    Applied Organometallic Chemistry 6 (1992), S. 537-542 
    Details
    ISSN: 0268-2605
    Keywords: Organotin ; DNA ; Mössbauer ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The compounds R2SnCl2 and R3SnCl (R=Me, Et, nBu, nOct, Ph, in ethanol solution) as well as the aqueous species [Me2Sn(OH2)n]2+ and [Me3Sn(OH2)2]+, react with aqueous native DNA, yielding solid phases. According to the pointcharge model treatment of the 119Sn Mössbauer parameter nuclear quadrupole splitting, trans-octahedral R2Sn(O2PXY)2, and trigonalbipyramidal R3Sn(O2PXY), (R=Me, Et, nBu), would occur in the pellets, the tin atoms being coordinated by phosphodiester groups of the nucleic acid. The precipitates from Ph2SnIV would consist of the DNA complex as well as of the Ph2SnIV distannoxane obtained by hydrolysis of the reactant, whilst nOct2SnCl2, nOct3SnCl and Ph3SnCl would mainly yield stannoxanes and hydroxides. The water-soluble hydrolyzed species [Me2Sn(OH)(OH2)n]+, Me2Sn(OH)2 and Me3Sn(OH)(OH2) do not show any interaction with native DNA, although they are possibly coordinated by phosphate oxygen atoms in model aqueous systems, in the presence of excess ligand.These trends have been rationalized by QSAR approach (Quantitative Structure-Activity Relationships) in terms of electronic factors related to tin-oxygen (phosphate) Coulomb interactions, as well as the lipophilicity of R in the RnSnIV moieties.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aoc.590060611
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  • 5
    Electronic Resource
    Electronic Resource
    Organometallic Complexes with Biological Molecules: VIII. Synthesis, Solid State and in vivo Investigation of Triorganotin(IV) Derivatives of L-Homocysteic Acid (1997)
    New York, NY [u.a.] : Wiley-Blackwell
    Applied Organometallic Chemistry 11 (1997), S. 601-616 
    Details
    ISSN: 0268-2605
    Keywords: triorganotin(IV) ; L-homocysteic acid ; infrared ; Mössbauer ; NMR ; sea urchin ; Paracentrotus lividus (Echinodermata) ; Chemistry ; Industrial Chemistry and Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Several new triorganotin(IV) derivatives of L-homocysteic acid (L-HCAH) with formula R3Sn(L-HCA) (R=Me, nBu, Ph) have been synthesized. Their solid-state configurations were determined by IR and Mössbauer spectroscopy. The tin(IV) atom is five-coordinated in all the complexes, with the L-homocysteic acid behaving as a monoanionic bidentate ligand coordinating the tin(IV) atom through a chelating or bridging carboxylate group. The sulfonate (SO3-) and NH3+ groups of L-homocysteic acid maintain their free acid configuration and hence do not participate to the coordination of the tin(IV) atom. Coordination hypotheses have been checked through the correlation between the Mössbauer parameter isomer shift, δ, and partial atomic charge on the tin atoms, QSn, performed, for all the new organotin(IV) compounds, on the basis of an equalization procedure applied to idealized trigonal-bipyramidal structures for R3Sn(L-HCA).1H and 13C NMR spectra of the complexes show that pentacoordination of the tin atom, with R groups in the equatorial plane of a trigonal bipyramid, is retained in DMSO solution. The NMR data confirm also that the uncoordinated NH3+ group of the ligand is still present in solution.Results gathered after exposure of two- to four-cell embryos of the sea urchin Paracentrotus lividus (Echinodermata) to the triorganotin(IV) L-homocysteate derivatives as well as to the parent triorganotin(IV) chlorides document cytotoxicity of the complexes, while free L-homocysteic acid exerts no significant toxic activity. The trimethyltin(IV) L-homocysteate derivative seems to exert a lower cytotoxicity than the tributyl- and triphenyl-tin(IV) ones. Different structural lesions have been identified by comparative analysis of mitotic chromosomes from untreated embryos (negative controls) and embryos treated with triorganotin(IV) L-homocysteate derivatives, such as (1) suppression of the stretch among sister chromatids at the beginning of anaphase stage; (2) deeply stained zones mainly located at the telomeric regions of chromosomes; (3) arm breakages; and (4) chromosome bridges among daughter chromosomes at anaphase stage. A colchicine-like effect of triorganotin(IV) L-homocysteate derivatives was observed. © 1997 John Wiley & Sons, Ltd.
    Additional Material: 20 Ill.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Identifying human platelet glycoproteins IIb and IIIa by capillary electrophoresis (1998)
    Weinheim : Wiley-Blackwell
    Electrophoresis 19 (1998), S. 1468-1474 
    Details
    ISSN: 0173-0835
    Keywords: Glycoproteins ; Capillary electrophoresis ; Glanzmann's thrombasthenia ; Platelet membrane ; Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Glanzmann thrombasthenia (GT) is an inherited hemorrhagic defect due to a failure of the platelet membrane glycoprotein (GP) IIb-IIIa complex. Capillary electrophoresis (CE) analysis of solubilized platelet membranes from normal individuals showed the presence of two peaks with a migration time of 27 and 29 min, respectively. An excellent run-to-run and day-to-day reproducibility of the technique (〈 1% variation of the retention time) was documented. Using an automated Ferguson method, the apparent molecular masses were 100.0 kDa and 138.5 kDa, respectively. Immunoprecipitation with monoclonal antibodies anti-GP IIIa (B59.2.1) and anti-IIb (61.9.1.3) showed the two peaks as IIIa and IIb, respectively. Electropherograms of a GT young man showed the lack of both peaks. Less than 50% of each peak was present in his parents. Polyacrylamide gel electrophoresis (PAGE), immunoblotting, and flow cytometry analyses showed that GP IIb and IIIa were undetectable in the platelet membranes from the propositus, half of the normal amount being present in both parents. These findings indicate CE to be a rapid, sensitive and reliable tool to investigate patients with abnormalities of the GP IIb-IIIa complex.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/elps.1150190842
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  • 7
    Electronic Resource
    Electronic Resource
    A 33 kDa protein band in enhanced during long-term adaptation of EUE cells to a hypertonic medium (1991)
    New York, NY [u.a.] : Wiley-Blackwell
    Cell Biochemistry and Function 9 (1991), S. 87-94 
    Details
    ISSN: 0263-6484
    Keywords: Hypertonic stress ; EUE cells ; SDS-PAGE ; Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: A cell line derived from human embryonic epithelium (EUE cells) shows an enhanced expression of a 33 kDa protein when adapted to grow in a hypertonic medium containing 0·246 M NaCl (1·8 × the isotonic concentration). The maximum amount of this protein, followed by SDS-PAGE electrophoresis, was found after 4 days of adaptation; thereafter, the protein band remained fairly constant up to 30 days. When the cells were transferred back to a medium containing 0·137 M NaCl (isotonic medium), the protein pattern reverted to that of control cells. This protein is mainly localized in the cytosol, although a small part is associated with the 150 000 g pellet and needs detergents to be extracted. The molecular weight and the cellular location suggest a possible analogy with the so-called amphitropic proteins, that are known to interact with both the epidermal growth factor receptor and hydrophobic structures, such as the membrane phospholipids and the cytoskeletal components.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cbf.290090204
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  • 8
    Electronic Resource
    Electronic Resource
    Reduced variables for the overall crystallization rate of some polymers (1974)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Letters Edition 12 (1974), S. 375-379 
    Details
    ISSN: 0360-6384
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1974.130120702
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  • 9
    Electronic Resource
    Electronic Resource
    Organometallic complexes with biological molecules. IX. Diorgano- and triorgano-tin(IV)[meso-tetra (4-sulfonatophenyl)porphinate] derivatives: solid-state and solution-phase structural aspects and in vivo effects (1997)
    New York, NY [u.a.] : Wiley-Blackwell
    Applied Organometallic Chemistry 11 (1997), S. 707-719 
    Details
    ISSN: 0268-2605
    Keywords: organotin(IV) ; porphine ; Mössbauer ; NMR ; development ; Ascidiaceae ; Chemistry ; Industrial Chemistry and Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Diorgano- and triorgano-tin(IV) derivatives of meso-tetra(4-sulfonatophenyl)porphine (H4TPPS) with general formula (R2Sn)2TPPS and (R3Sn)4TPPS (TPPS4-=[meso-tetra(4-sulfonatophenyl)porphinate]4-, R=Me, Bu, Ph) have been obtained and their solid-state configuration inferred on the basis of IR and Mössbauer spectroscopy, while solution-phase studies have been carried out by 1H and 13C NMR in DMSO-d6, together with determination of the in vivo cytotoxicity of the new derivatives towards embryonic development of Ciona intestinalis. In particular, octahedral and trigonal-bipyramidal eq-R3Sn polymeric configurations are proposed, in the solid state, respectively for (R2Sn)2TPPS and (R3Sn)4TPPS complexes, with the arylsulfonate groups behaving as monoanionic bidentate bridging ligands.The 1H and 13C NMR data lead to the conclusion that the metal-to-ligand ratio (2:1 or 4:1), binding site (the sulfonato-group oxygens), and the coordination polyhedron around the metal (trans-octahedral or trigonal-bipyramidal) found in the solid state are preserved in solution. © 1997 John Wiley & Sons, Ltd.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Ethylene-butadiene copolymers, 2.Part 1: cf.1. Long branching, double bond distribution and their effect on polymer properties (1978)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 179 (1978), S. 2187-2194 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The principal structural characteristics of ethylene-butadiene copolymers prepared with a modified vanadium catalyst are described. The distribution of the butadiene monomeric units, though non-random, is sufficiently homogeneous at low monomeric units content of butadiene (1-3 mole-%) that a ready and efficient vulcanization with sulfur based systems is easily achieved.Long chain branching, which has a detrimental effect on the copolymer properties, can be measured rheologically and controlled at a very low level by the catalyst system. Vulcanized ethylene-butadiene copolymers show improved mechanical properties with respect to high density polyethylene and good processability before curing.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1978.021790907
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