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  • 1980-1984  (4)
  • 1975-1979  (3)
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  • 1
    Electronic Resource
    Electronic Resource
    Nonjunctional acetylcholine receptor channel open time decreases during development of Xenopus muscle (1981)
    [s.l.] : Nature Publishing Group
    Nature 289 (1981), S. 411-413 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The experiments were performed on myotomal muscles of Xenopus laevis embryos and tadpoles. Procedures of dissection and staging have been described previously7. The muscle cells extend the length of a myotome and insert at myocommata where the neuromuscular junctions are located. Focal synaptic ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/289411a0
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Some physiological and behavioural responses inBos indicus andBos taurus heifers acclimatized to the hot humid seasonal equatorial climate (1979)
    Springer
    International journal of biometeorology 23 (1979), S. 231-241 
    Details
    ISSN: 1432-1254
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geography , Physics
    Notes: Abstract Some physiological and behavioural responses were observed in German Brown, Holstein-Friesian and White Fulani heifers during four different quarters of the year in an attempt to assess their adaptability to the seasonal equatorial climate of Southern Nigeria. Rectal temperatures under shade conditions showed slight but significant (P〈0.05) fluctuations. Holstein heifers experienced hyperthermia and panted in the sun, unlike the Brown and Fulani cattle. Breathing rate showed a highly significant (P〈0.01) seasonal variation. The heifers were generally most comfortable during the wettest periods of the year. The Holstein and Fulani showed the highest and lowest responses respectively. The Fulani did not seek shade; the Holstein sought shade more frequently than the Brown heifers. The Brown are more adaptable than the Holstein to the hot humid environment in which the Fulani cattle are relatively comfortable.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01553774
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Conductance of channels opened by acetylcholine-like drugs in muscle end-plate (1975)
    [s.l.] : Nature Publishing Group
    Nature 253 (1975), S. 204-206 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The mean single-channel conductance, and mean lifetime of the open state, have been estimated at the voltage-clamped end-plate of the frog (summer Rana pipiens) cutaneus pectoris muscle. Methods similar to those of Anderson and Stevens5, were used with the addition of Normarski interference ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/253204a0
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Post-weaning growth and development of Nigerian Dwarf sheep (1981)
    Springer
    Tropical animal health and production 13 (1981), S. 101-106 
    Details
    ISSN: 1573-7438
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Résumé Des études ont été faites pour établir le modèle de croissance et du poids adulte du mouton nain nigerian en utilisant 18 agnelles et 13 agneaux mâles nourris,ad libitum, de fourrages et de concentrés du sevrage á l'âge adulte. Les courbes de croissance établies par analyse quadratique, sur ordinateur montrent que le poids des brebis adultes est d'environ 33 kg et qu'il est atteint à l'âge de 30 à 36 mois alors que celui des béliers est de 42 kg, entre 27 et 30 mois. Les mensurations corporelles faites sur des animaux arrivés à maturité ont été également relevées.
    Abstract: Resumen Se llevaron a cabo estudios tendientes a determinar el patrón de crecimiento y el peso corporal adulto de ovejas enanas nigerianas. Para el efecto se utilizaron 18 corderos hembras y 13 corderos machos, alimentadosad lib. con alimento basto y concentrados, desde el destete hasta la edad adulta. Las curvas cuadráticas de crecimiento generadas por el computador revelaron que el peso adulto de las ovejas enanas es de aproximadamente 33 kg, el cual lo adquieren entre los 30 y 36 meses de edad. El del macho es de 42 kg aproximadamente.
    Notes: Summary Studies aimed at defining the growth pattern and the mature body weight of Nigerian Dwarf sheep were conducted using 18 ewe lambs and 13 ram lambs fedad lib. on roughages and concentrates from weaning to maturity. Computer generated quadratic growth curves showed that the mature body weight of ewes is about 33 kg attained between 30 and 36 months of age while that of rams is about 42 kg attained between 27 and 30 months of age. Body measurements at maturity were also determined.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02237900
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  • 5
    Electronic Resource
    Electronic Resource
    Untersuchungen zur Temperaturabhängigkeit der 31P-chemischen Verschiebung in Trialkoxyphosphazen-N-phosphoryldialkylesternProfessor Hans-Albert Lehmann zum 60. Geburtstage am 1. Mai 1979 gewidmet (1979)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 451 (1979), S. 5-11 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Temperature Dependence Investigations of 31P Chemical Shifts of Trialkoxyphosphazene N-phosphoryldialkylestersThe 31P NMR spectra of a series of trialkoxyphosphazene-N-phosphoryldialkylesters, (RO)3P=N—P(O)(OR′)2, where R = R′ = Et; R = Et, R′ = Bu; R = Bu, R′ = Et; R = R′ = Bu; and R = R = R′ = Hex respectively, and of trichlorophosphazene-N-phosphoryldichloride were investigated at various temperatures. The temperature dependence of chemical shift of phosphorus belonging to the phosphazene group is multiplicately larger than that of phosphorus belonging to the phosphoryl group. This fact also could be confirmed for other simple phosphazene and phosphoryl compounds. As discussed this different temperature dependence of 31P chemical shift is not a consequence of the medium but of the molecular structure.
    Notes: Für eine Reihe von Trialkoxyphosphazen-N-phosphoryldialkylestern, (PO)3P=N—P(O)(OR′)2, wobei R = R′ = Et; R = Et, R′ = Bu; R = Bu, R′ = Et; R = R′ = Bu bzw. R = R′ = Hex waren, sowie für Trichlorphosphazen-N-phosphoryldichlorid wurden jeweils 31P-NMR-Spektren bei verschiedenen Temperaturen aufgenommen. Es zeigte sich, daß die Temperaturabhängigkeit der chemischen Verschiebung für den Phosphor der Phosphazen-Gruppierung um ein mehrfaches größer ist als die für den Phosphor der Phosphoryl-Gruppierung. Dies konnte auch allgemein für andere einfache Phosphazen- und Phosphoryl-Verbindungen bestätigt werden. Es wird diskutiert. daß diese unterschiedliche Temperaturabhängigkeit der 31P-chemischen Verschiebung nicht auf Medieneinflüsse, sondern auf die molekulare Struktur zurückzuführen ist.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19794510102
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  • 6
    Electronic Resource
    Electronic Resource
    Synthese von N-Di(alk-, ar-)oxyphosphoryl-tri(alk-, ar-)-oxyphosphazenen, (RO)2P(O)—N=P(OR)3, durch P—N-Bindungsknüpfung (1983)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 502 (1983), S. 21-28 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis of N-Di(alk-, ar-)oxyphosphoryl-tri(alk-, ar-)oxyphosphazenes, (RO)2P(O)—N=P(OR)3, by P—N-Bond FormationThe title compounds can be prepared from di- and triesters of phosphorous acid, sodium azide, and carbon tetrachloride in a single step procedure and in high yields. Due to the combination of the Atherton-Todd and the Staudinger reaction toxic phosphoric acid ester azides are formed only in situ and their concentration is kept very small. As by-products trichloromethane phosphonic acid esters, (RO)2P(O)CCl3, esters of phosphoric acid and condensed phosphoric acids as well as N-alkylimidodiphosphoric acid esters, [(RO)2P(O)]2NR, are formed. Their formation can be avoided or reduced by choosing suitable reaction conditions. The mechanism of the reaction is discussed.
    Notes: Die Darstellung der Titelverbindungen ist nach einer kombinierten Atherton-Todd- und Staudinger-Reaktion in einem Verfahrensschritt aus Di- und Triestern der phosphorigen Säure, Natriumazid und Tetrachlorkohlenstoff in hohen Ausbeuten möglich. Toxische Phosphorsäureesterazide, (RO)2P(O)N3, werden nur in situ gebildet, wodurch ihre Konzentration extrem niedrig gehalten wird. Als Nebenprodukte treten Trichlormethanphosphonsäureester, Cl3CP(O)(OR)2, Ester der Phosphorsäure und kondensierter Phosphorsäuren sowie N-Alkylimidodiphosphorsäureester, [(RO)2P(O)]2NR, auf. Ihre Bildung kann durch die Wahl geeigneter Reaktionsbedingungen vermieden bzw. vermindert werden. Der Mechanismus der Reaktion wird diskutiert.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19835020704
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  • 7
    Electronic Resource
    Electronic Resource
    Zur Umsetzung des Zweikomponentensystems Triethylphosphit/Tetrachlorkohlenstoff mit wasserstoffhaltigen Nucleophilen 1. Die Reaktion mit SäureamidenProfessor Hans-Albert Lehmann zum 65. Geburtstage am 1. Mai 1984 gewidmet (1984)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 511 (1984), S. 51-56 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Reaction of the Two-component System Triethylphosphite/Carbon Tetrachloride with Nucleophiles Containing Hydrogen. 1. Reaction with Acyl AmidesAcyl amides react with the two-component system triethylphosphite/carbon tetrachloride yielding N-acyl phosphazenes, (EtO)3P=N—Ac. In this way (EtO)3P=N—P(O)(OEt)2, (EtO)3P=N—CN, (EtO)3P=N—C(O)Ph, and (EtO)3P=N—SO2Ph were prepared. Ethyl esters of phosphoric acid and trichloromethane phosphonic acid were obtained as by-products.
    Notes: Säureamide reagieren mit dem Zweikomponentensystem Triethylphosphat/Tetrachlorkohlenstoff zu N-Acylphosphazenen, (EtO)3P=N—Ac. Auf diese Weise wurden aus entsprechenden Amiden (EtO)3P=N—P(O)(OEt)2, (EtO)3P=N—CN, (EtO)3P=N—C(O)Ph und (EtO)3P=N—SO2Ph dargestellt. Als Nebenprodukte werden Phosphorsäureethylester und Trichlormethanphosphonsäureester erhalten.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19845110406
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