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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Chemie in unserer Zeit 23 (1989), S. 193-199 
    ISSN: 0009-2851
    Keywords: Chemistry ; Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Wie alle lebenden Organismen befinden sich Pflanzen in einem Dilemma: Einerseits sind Schwermetall-Ionen entscheidend für ihre optimale Entwicklung, auf der anderen Seite führen zu hohe Schwermetallkonzentrationen zu Vergiftungserscheinungen. Es wird beschrieben, mit welchem Chemismus sich Pflanzen (und ein Teil der Pilze) vor zuviel Schwermetall-Ionen schützen.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 14 (1979), S. 499-505 
    ISSN: 0029-5981
    Keywords: Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: The method for the evaluation of the thermal loads used in the incremental finite element analysis of elasto-plastic stress is presented. The stress distributions obtained by two apparently possible methods for evaluation of the thermal loads are compared.
    Additional Material: 3 Ill.
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  • 3
    Electronic Resource
    Electronic Resource
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 18 (1982), S. 1031-1044 
    ISSN: 0029-5981
    Keywords: Engineering ; Engineering General
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: A mathematical model for the calculation of the three-dimensional thermal history of a composite cylinder, during girth welding by the TIG method, is presented. The solution is obtained by the alternating direction implicit finite difference method. The model takes into consideration the distribution of the heat input from the welding arc, the heat losses from the cylinder by radiation and convection, the dependence of the physical properties of the metal on the temperature and the solid-liquid phase transformation. The effects of the efficiency coefficient of the welding arc, of the effective arc radius and of heat transfer coefficients on the thermal history are presented.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 13 (1969), S. 535-540 
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Polyesters based on tetrabromophthalic anhydride are self-extinguishing in the range of 8-12% bromine content and nonburning at higher levels of the latter. An increase in bromine content results in higher flexural and tensile strenght and flexural modulus, while impact resistance is slightly reduced. Mechanical Properties vary with bromine content in the 0-12% range and remain practically unaffected at higher levels up to 23%.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Cellular Physiology 130 (1987), S. 270-275 
    ISSN: 0021-9541
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: Interferons have recently been recognized as potent mediators in inflammatory processes, exerting profound effects on fibroblasts. The influence of interferons γ and α on the chemotactic movement of fibroblasts toward various attractants was, therefore, investigated. Normal human adult and embryonal dermal fibroblasts, fibrosarcoma-derived fibroblasts and SV40-transformed fibroblasts were tested against conditioned medium from fibroblasts, the chemotactic peptide C-140 of fibronectin, platelet-derived growth factor, and leukotriene B4 as attractants in the presence or absence of the interferons. Interferons γ and α inhibited chemotaxis in a dose-dependent manner and at concentrations at least as low as 10-2 ng/ml. Inhibition was noticeable when the cells were exposed to interferon for as short a period as 60 minutes, and the effect was not readily reversible. Inhibition occurred when the cells came from sparse or dense cultures, but when platelet-derived growth factor was the attractant and the cells had been grown at low density there was no inhibition. It is concluded that this is a specific effect, not to be wholly explained by overall increase in membrane rigidity. Inhibition of fibroblast chemotaxis by interferons may be an important regulatory mechanism during wound healing or fibrosis and metastatic spread of tumor cells.
    Additional Material: 4 Ill.
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  • 6
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 594 (1955), S. 21-32 
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1979 (1979), S. 1205-1211 
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis and Stereochemistry of 3,3′-(1,2-Diethylethylene)diphenols1-Chloro-1-(3-methoxyphenyl)propane 5 was converted by C-C coupling in to a mixture of dia-stereomeric 3,4-bis(3-methoxyphenyl)hexanes 6, which could be separated by crystallization into the meso- and rac-compounds 6a and 6b, respectively. After ether cleavage meso-3,3′-(1,2-di-ethylethylene)diphenol and rac-3,3′-(1,2-diethylethylene)diphenol (2a and 2b) were obtained; the latter was resolved via the diastereomeric (+)- and (-)-3,3′-(1,2-diethylethylene)diphenyl-3,4-bis[3-D-(+)-3-bromo-2-oxo-8-bonanylsulfonates] (7) into (+)-3,3′-(1,2-diethylethylene)diphenol and (-)-3,3′-(1,2-diethylethylene)diphenol [(+)-2b and (-)-2b]. The absolute configuration of the optical enantiomers could be established by means of oxidative degradation of (+)-2b.
    Notes: Aus 1-Chlor-1-(3-methoxyphenyl)propan (5) wurde durch C-C-Verknüpfung das Diastereomerenpaar 3,4-Bis(3-methoxyphenyl)hexan 6 erhalten. Durch Kristallisation konnten hieraus die meso- und die rac-Verbindungen 6a bzw. 6b isoliert warden. Die Spaltung der Ether führte zu meso-3,3′-(1,2-Diethylethylen)diphenol und rac-3,3′-(1,2-Diethylethylen)diphenol (2a bzw. 2b). Verbindung 2b wurde über die diastereomeren (+)- und (-)-3,3′-(1,2-Diethylethylen)diphenyl-3,4-bis[3-D-(+)-3-brom-2-oxo-8-bornanylsulfonate] (7) in (+)-3,3′-(1,2-Diethylethylen)diphenol und (-)-3,3′-(1,2-Diethylethylen)diphenol [(+)-2b bzw. (-)-2b] aufgetrennt. Die absolute Konfiguration der optischen Antipoden wurde durch oxidativen Abbau von (+)-2b ermittelt.
    Type of Medium: Electronic Resource
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  • 8
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: On the Chemistry of Sulfur Diimides, III. Reactions of Aromatic Bis-amino Compounds with N-Sufinyl Sulfonamides and N,N'-Bis-arylsulfonyl-sulfur DiimidesBifunctional amino compounds 1 react with N-sulfinyl-p-toluene sulfonamide (2) and N,N'-bis-[p-toluenesulfonyl]-sulfur diimide (3) to give the derivatives 4-8, depending on the nature of X. By reaction with 2,3-dimethyl-1,3-butadiene the cyclic sulfur diimide 8b gives the adduct 11, the alkaline cleavage of which yields the pyrrole 12.
    Notes: Bifunktionelle Aminoverbindungen 1 reagieren mit N-Sulfinyl-p-toluolsulfonamid (2) und N.N'-Bis-[p-toluolsulfonyl]-schwefeldiimid (3) in Abhängigkeit von der Art der Gruppe X zu den Derivaten 4-8. Das cyclische Schwefeldiimid 8b liefert mit 2.3-Dimethyl-1.3-butadien das Addukt 11, dessen alkalische Spaltung zum Pyrrol 12 führt.
    Type of Medium: Electronic Resource
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  • 9
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Cellular Physiology 143 (1990), S. 172-177 
    ISSN: 0021-9541
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: Fibroblast chemotaxis has usually been determined in Boyden-type chambers with polycarbonate filters, assuming that a stable concentration gradient of the attractant develops that causes directional migration of the cells. This view has been repeatedly challenged, and development of such gradients in vivo is unlikely. The present experiments were designed to test if a stable concentration gradient was required for normal dermal fibroblasts to migrate toward platelet-derived growth factor. It was found that a brief pulse of the attractant was required and sufficient to induce chemotaxis. The pulse had to contain a specific concentration of attractant and was ineffective when not unilateral. The observed effects could not be attributed to induction of random migration or migration on a mediator-coated surface. It is not clear which machinery is regulating this cellular behaviour, but it is suggested that cells may migrate in vivo by similar mechanisms, because the establishment of stable concentration gradients of attractants in tissues is deemed unlikely.
    Additional Material: 1 Ill.
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