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  • Inorganic Chemistry  (42)
  • Cell & Developmental Biology  (27)
  • Physical Chemistry  (13)
  • Wiley-Blackwell  (82)
  • 1970-1974  (77)
  • 1950-1954  (5)
  • 1973  (77)
  • 1950  (5)
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  • Wiley-Blackwell  (82)
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  • 1970-1974  (77)
  • 1950-1954  (5)
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  • 1
    Electronic Resource
    Electronic Resource
    A flash photolysis-resonance fluorescence kinetics study of the reactions of ground-state sulfur atoms. V. Rate parameters for the reaction of S(3P)with cis-2-butene and tetramethylethylene (1973)
    New York, NY : Wiley-Blackwell
    International Journal of Chemical Kinetics 5 (1973), S. 841-857 
    Details
    ISSN: 0538-8066
    Keywords: Chemistry ; Physical Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Rate parameters for the reaction of ground-state atomic sulfur, S(3P), with the olefins cis-2-butene and tetramethylethylene have been determined over a temperature range of ∽280°K. A major finding of this study was that the rate constants for both reactions showed negative temperature dependencies. When k is expressed in the form of an Arrhenius equation, this necessarily leads to negative activation energies: k1 = (4.68 ± 0.70) × 10-12 exp (+0.23 ± 0.09 kcal/mole)/RT (219°-500°K) k2 = (4.68 ± 1.70) × 10-12 exp (+1.29 ± 0.23 kcal/mole)/RT (252°-500°K) Units are cm3 molec-1s-1. When a threshold energy of 0.0 kcal/mole is assumed for reaction (2), the temperature dependence of the preexponential term has a value of T-2. Making the usual simplifying assumptions, neither collision theory nor transition state theory leads to a preexponential factor with a strong enough negative temperature dependence. A comparison of these results with those derived from studies of the reactions of atomic oxygen, O(3P), with the same olefins shows that in both studies simple bimolecular processes were being examined. Also discussed are the possible experimental and theoretical ramifications of these new results.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/kin.550050511
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  • 2
    Electronic Resource
    Electronic Resource
    A flash photolysis resonance fluorescence kinetics study of ground-state sulfur atoms. III. Rate parameters for reaction of S(3P) with ethylene episulfide (1973)
    New York, NY : Wiley-Blackwell
    International Journal of Chemical Kinetics 5 (1973), S. 149-153 
    Details
    ISSN: 0538-8066
    Keywords: Chemistry ; Physical Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Absolute rate constants for the reaction of S(3P) with ethylene episulfide were measured over a C2H4S concentration range of 5, a total pressure of 20-200 tort, and a flash intensity range of ˜4. Over this range of variables, the bimolecular rate constant was found to be invariant. Because of limitations imposed by the physical properties of the reactant C2H4S, temperature variations were necessarily held to the range 298-355°K. The bimolecular rate constant was found to be invariant over this limited temperature range, having a value of (4.47 ± 0.26) × 10-11 cm3 molec.-1 sec-1. The possible influence of this reaction in studies of the S(3P)-ethylene system are discussed.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/kin.550050113
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  • 3
    Electronic Resource
    Electronic Resource
    A flash photolysis-resonance fluorescence kinetics study of ground-state sulfur atoms. IV. Rate parameters for reaction of S(3P) with propene and 1-butene (1973)
    New York, NY : Wiley-Blackwell
    International Journal of Chemical Kinetics 5 (1973), S. 375-384 
    Details
    ISSN: 0538-8066
    Keywords: Chemistry ; Physical Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Using the technique of flash photolysis-resonance fluorescence, absolute rate constants have been measured for the reaction of S(3P) with propene and 1-butene. Variations in experimental conditions included the following: temperature (215-500°K); total pressure a factor of 10; olefin concentration, a factor of 6; flash intensity (S atom concentration), a factor of 10. It was found that over these variations in the experimental conditions only the temperature had a measureable effect on the bimolecular rate constant. The derived Arrhenius rate expressions for the reactions (2) and (3) were as follows: \documentclass{article}\pagestyle{empty}\begin{document}$$ k_2 = \left( {6.03 \pm 0.72} \right) \times 10^{ - 12} \exp \left( {\frac{{ - 0.38 \pm 0.09kcal/mol}}{{RT}}} \right) $$\end{document} temperature range 214-500°K \documentclass{article}\pagestyle{empty}\begin{document}$$ k_3 = \left( {7.41 \pm 1.15} \right) \times 10^{ - 12} \exp \left( {\frac{{ - 0.36 \pm 0.09kcal/mol}}{{RT}}} \right) $$\end{document} Units are cm3 molec-1 s-1.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/kin.550050308
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  • 4
    Electronic Resource
    Electronic Resource
    Beiträge zur Chemie des Schwefels. 113. Der Einfluß von Verunreinigungen auf die elektrische Leitfähigkeit des flüssigen Schwefels (1973)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 399 (1973), S. 77-86 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Contributions to the Chemistry of Sulphur. 113. The Effect of Impurities on the Electrical Conductivity of Molten SulphurThe electrical conductivity of molten sulfur in the range up to 200°C was analysed on samples which were specially purified as well as doped with paraffin, phenanthrene, benzidine, benzil, bromine, and iodine.The current flow below 160°C results from electrophoretically migrating impurities and by interaction with the impurities ionized molecules, whereas at higher temperatures conduction is caused by electrons. At the minimum of viscosity of the molten sulfur (154,5°C) the conductivity shows a maximum, which is shifted by impurities especially halogens up to 10°C towards lower temperatures. The relation between the electrophoretic conduction in the sulfur melt and the viscosity, which determines the mobility of the charged particles, is discussed.
    Notes: Die elektrische Leitfähigkeit des flüssigen Schwefels im Temperaturbereich bis 200°C wurde an nach verschiedenen Verfahren gereinigten und an mit Paraffin, Phenanthren, Benzidin, Benzil, Methandithiol sowie Brom und Jod dotierten Proben untersucht. Während bei höheren Temperaturen Elektronenleitung vorliegt, erfolgt der Ladungstransport unterhalb von 160°C, und zwar auch bei den reinsten heute darstellbaren Schwefelproben, durch elektrophoretisch wandernde Verunreinigungsteilchen bzw. In Wechselwirkung mit den Verunreinigungen ionisierte Schwefelmolekeln. Im Bereich des Viskositätsminimums der Schwefelschmelze (154,5°C) besitzt die Leitfähigkeit ein Maximum, das jedoch durch Beimengungen, insbesondere von Halogenen, auf bis zu 10°C niedrigere Temperaturen verschoben wird. Der Zusammenhang zwischen der elektrophoretischen Leitung im Schwefel und der die Beweglichkeit der geladenen Teilchen bestimmenden Zähigkeit der Schmelze wird diskutiert.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19733990111
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  • 5
    Electronic Resource
    Electronic Resource
    Preparation and study of new Complex Halogeno Acids of Iron(III) (1973)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 399 (1973), S. 345-348 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Darstellung und Untersuchung neuer komplexer Halogenosäuren des EisensEs wird über die Darstellung von gemischten Chloro-Bromo-Säuren von Eisen(III) und über einige ihrer Eigenschaften berichtet.
    Notes: The preparation of three simple and mixed halogeno acids of iron(III) is reported, and some physical and chemical properties as well as their I.R.-spectra are described.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19733990309
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  • 6
    Electronic Resource
    Electronic Resource
    Die Darstellung von Schwefeltetrafluorid aus den Elementen bei tiefer Temperatur in einem inerten Lösungsmittel (1973)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 401 (1973), S. 53-56 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The Preparation of Sulphur Tetrafluoride from the Elements at low Temperature in an Inert SolventPure sulphurtetrafluoride cna be prepared by the fluorination of elemental sulphur in CCl3F at -78°C in high yields.
    Notes: Schwefeltetrafluorid läßt sich in reiner Form in einer CCl3F-Lösung durch direkte Fluorierung von elementarem Schwefel bei -78°C in hoher Ausbeute darstellen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19734010108
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  • 7
    Electronic Resource
    Electronic Resource
    Asterane, IX. Synthese und Struktur von Tetramethyltetraasteranen (1973)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 106 (1973), S. 150-156 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Asteranes, IX. Synthesis and Structure of Tetramethyltetraasteranes1,2,7,8- and 1,4,5,8-tetramethylpentacyclo[6.4.0.02.7.04.11.05.10.]dodecane (3 and 6) are obtained by Wolff-Kishner reduction of the cage dimers from 2,3- and 2,5-dimethyl-p-benzoquinone via the tetrahydrazones 2 and 5. The structure of 6 is confirmed by X-ray-diffraction analysis.
    Notes: Wolff-Kishner-Reduktion überführt die Käfigdimeren aus 2,3- und 2,5-Dimethyl-p-benzochinon in 1,2,7,8- und 1,4,5,8-Tetramethylpentacyclo[6.4.0.02.7.04.11.05.10]dodecan (3 und 6), wobei es notwendig ist, die Tetrahydrazone 2 und 5 zu isolieren. Die Struktur von 6 wird durch Röntgenanalyse bestätigt.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19731060118
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  • 8
    Electronic Resource
    Electronic Resource
    Protonenresonanz-Spektroskopie ungesättigter Ringsysteme, XVIIIXVII. Mitteil.: D. Cremer und H. Günther, Liebigs Ann. Chem. 763, 87 (1972). Ein Benzolimin-1H-Azepin-Gleichgewicht (1973)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 106 (1973), S. 984-995 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Proton Resonance Spectroscopy of Unsaturated Ringsystems, XVIII.XVII. Mitteil.: D. Cremer und H. Günther, Liebigs Ann. Chem. 763, 87 (1972) A Benzeneimine-1 H-Azepine EquilibriumThe temperature dependence of the 1H n.m.r. spectrum of 4,5-bis(methoxycarbonyl)-3,6-diphenyl-1-p-tosyl-1H-azepine (11) is described. The results are interpreted on the basis of a benzeneimine-1H-azepine valence tautomerism (equilibrium distribution at room temperature ca. 3 : 97).
    Notes: Es wird über die Temperaturabhängigkeit des 1H-NMR-Spektrums von 4,5-Bis(methoxycarbonyl)-3,6-diphenyl-1 -p-tosyl-1H-azepin (11) berichtet. Die Befunde werden im Sinne einer Benzolimin-1H-Azepin-Valenztautomerie (Gleichgewichts-Verteilung bei Raumtemperatur ca. 3 : 97) interpretiert.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19731060332
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  • 9
    Electronic Resource
    Electronic Resource
    Reaktionen an Indolderivaten, XIX. Stereoselektive Cyclisierungen in der Indolreihe (1973)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 106 (1973), S. 3106-3118 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Reactions with Indole Derivatives, XIX. Stereoselective Cyclisations in the Indole SeriesSubstituted 1-allylnorharman derivatives rearrange after reaction with formaldehyde via a char-ge-induced sigmatropic process and subsequently cyclise stereoselectively to yield substituted indoloquinolizidines. The constitution and configuration of the reaction products is described.
    Notes: Substituierte 1 -Allylnorharmanderivate unterliegen nach Umsetzung mit Formaldehyd einer raschen ladungsinduzierten sigmatropen Umlagerung und cyclisieren anschließend stereo-selektiv zu substituierten Indolochinolizidinen. Die Konstitution und die Konfiguration der Reaktionsprodukte wird beschrieben.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19731061003
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  • 10
    Electronic Resource
    Electronic Resource
    Stereotaxic map of the muscle fibers in the indirect flight muscles of Drosophila melanogaster (1973)
    New York, NY : Wiley-Blackwell
    Journal of Morphology 140 (1973), S. 153-158 
    Details
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: It is possible to monitor the electrical activity of the motor neurons of Drosophila by recording the electrical activity of the muscle fibers. We have found that it is possible to specify the location of the subcuticular terminations and to describe the orientation within the thorax for the individual muscle fibers, because of the large size of the fibers and because the surface anatomy of Drosophila is known in detail. A map has been made to indicate the location of the muscle fibers with respect to superficial landmarks. The importance of the stereotaxic map for physiological studies is discussed.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jmor.1051400203
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