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  • Inorganic Chemistry  (42)
  • Life and Medical Sciences
  • 1980-1984
  • 1970-1974  (64)
  • 1960-1964
  • 1940-1944
  • 1973  (64)
Collection
Publisher
Years
  • 1980-1984
  • 1970-1974  (64)
  • 1960-1964
  • 1940-1944
Year
  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 399 (1973), S. 77-86 
    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.
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 399 (1973), S. 345-348 
    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.
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 401 (1973), S. 53-56 
    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.
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 106 (1973), S. 150-156 
    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.
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  • 5
    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.
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  • 6
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 106 (1973), S. 3106-3118 
    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.
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  • 7
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal of Morphology 140 (1973), S. 153-158 
    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.
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  • 8
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: The dorsal proctodeal wall of the Coturnix contains a gland which is especially well-developed in the sexually active male and which secretes a foamy exudate. This gland has not been recorded in any other genus of birds and appears to be unique to members of the genus Coturnix. On the basis of its location in the adult we have named this gland the proctodeal gland (glandula proctodealis). Structure of the gland does not conform to any curently defined category of glands because it is an aggregate of individual glandular units each of which opens independently into the proctodeal cavity but with the entire structure enclosed by a connective tissue capsule. We have thus characterized it as an aggregate gland. Observations on the arrangement and composition of the fibrous capsule and its intimate relationship to the perimysium of M. sphincter cloacae indicate that release of the secretion probably results from contraction of the cloacal musculature. Preliminary data suggest that development of glandular tissue in the female may be a function of age rather than of androgen sensitivity which characterizes the male gland. It is concluded that the chemical nature of the glandular secretion and its function in the sexually active bird, as based on presently available information, remains unknown.
    Additional Material: 5 Ill.
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  • 9
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Cellular Physiology 81 (1973), S. 171-180 
    ISSN: 0021-9541
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: Rates of incorporation of labelled thymidine (RIT), radioautographic labelling index for DNA synthesis (LI) and mitotic incidence following colcemid metaphase arrest (MI) were measured in organ cultures of newborn and adult rat lung. In adult cultures these three parameters correlated well, being low after explantation and reaching a maximum after two to three days. In newborn cultures RIT fell several fold over the first 24 hours after explantation and, in this respect, did not correlate with LI and MI. The changes in RIT over the first 24 hours appear to be due to changes in the degree of competition between endogenous TdR and exogenous labelled TdR, probably caused by leakage of the intracellular thymidine pool following explantation. The report emphasizes the need to check RIT data against radioautographic evidence before accepting it as an index of DNA synthesis.
    Additional Material: 8 Ill.
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  • 10
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Cellular Physiology 82 (1973), S. 511-512 
    ISSN: 0021-9541
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Additional Material: 1 Ill.
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