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  • Springer  (248)
  • Wiley-Blackwell  (192)
  • American Geophysical Union (AGU)
  • 1970-1974  (440)
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  • 1
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    Photoproduction of neutral pions on hydrogen at photon energies between 200 and 440 MeV (1971)
    Springer
    Details
    Publication Date: 1971-06-01
    Print ISSN: 0939-7922
    Electronic ISSN: 1431-5831
    Topics: Physics
    Published by Springer
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    PAPER CURRENT
  • 2
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    Unknown
    Photoproduction of neutral pions on hydrogen at photon energies between 200 and 440 MeV (1971)
    Springer
    Details
    Publication Date: 1971-06-01
    Print ISSN: 0939-7922
    Electronic ISSN: 1431-5831
    Topics: Physics
    Published by Springer
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    PAPER CURRENT
  • 3
    Electronic Resource
    Electronic Resource
    Photoproduction of neutral pions on hydrogen at photon energies between 200 and 440 MeV (1971)
    Springer
    The European physical journal 245 (1971), S. 225-252 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract At the Bonn 500 MeV electron synchrotron the differential cross section of the reaction γ+p → π0+p has been measured detecting the recoil proton by a magnetic spectrometer. Angular distributions between pion c.m. angles of 50 ° and 160 ° were taken at photon energies between 220 and 420 MeV.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01395234
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  • 4
    Electronic Resource
    Electronic Resource
    Photoproduction of neutral pions on hydrogen at photon energies between 200 and 440 MeV (1971)
    Springer
    The European physical journal 245 (1971), S. 272-282 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The two measurements of the process γ+p→π0+p at the Bonn 500 MeV electron synchrotron are discussed and after correction of systematic deviations combined to one set of data. A comparison with other measurements and theoretical calculations is given.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01395236
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  • 5
    Electronic Resource
    Electronic Resource
    Zur hormonalen Steuerung der Aktivität im Nebenhodengang (Ductus epididymidis) bei Ruineneidechsen (Lacerta sicula campestris Betta) (1971)
    Springer
    Journal of comparative physiology 73 (1971), S. 339-344 
    Details
    ISSN: 1432-1351
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Description / Table of Contents: Zusammenfassung 1. Behandelt man männliche Ruineneidechsen während der Refraktärperiode mit ICSH, Testosteron, FSH und LTH, so zeigt sich im Ductus epididymidis nur unter dem Einfluß des FSH und des LTH eine positive Reaktion. 2. Mit dem Taubenkropftest ließ sich zu verschiedenen Zeiten (August 1970 bis Januar 1971) Prolactin in der Hypophyse männlicher Ruineneidechsen nachweisen.
    Notes: Summary 1. Under natural conditions spermiogenesis in male lizards (Lacerta sicula campestris Betta) shows an annual periodicity which can be divided into 4 phases: a) progression (end of refractory period—March); b) culmination (April– June/July); c) regression (July); d) regeneration = refractory period (August–November/December). 2. About February the activation of the germ epithelium starts, but the growth of the Ductus epididymidis (D.e.) and the production of secretion from its wall epithelium cannot be found before the middle of March. 3. The same phase-shifting can be observed at the end of culmination, while spermiohistogenesis stops in about June, the secretion of the D.e. goes on and only decreases during July. In cross-sections of the epididymidis the cessation of diameters in the D. e. runs to a minimum in winter. 4. Before starting our experiments, we proved the occurrence of LTH in the hypophysis of male lizards (August 1st. 1970) using the pigeon cropsac test of Turner and Grosvenor. We could verify this result in September and October 1970 and in January 1971. 5. While Testosteron and ICSH have no effect on the D.e. in refractory animals we got good activity — depending on concentration—after injecting FSH and LTH. This could mean that the D.e. is not a secondary sexual character but belongs to the accessory sexual organ systems. Assurance, however, can only be obtained if experiments with hypophysectomized animals give positive results.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00297680
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  • 6
    Electronic Resource
    Electronic Resource
    The molecular organization of nerve membranes (1972)
    Springer
    The journal of membrane biology 9 (1972), S. 209-228 
    Details
    ISSN: 1432-1424
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Summary Plasma membranes were isolated from two types of squid nerves which have morphologically, different ratios of axolemma/Schwannlemma (A/S). These membranes were studied by means of differential and density gradient centrifugation. Thoroughly dissected giant axons were used as membrane source having low A/S ratio. Retinal fibers were used as membrane source with high A/S ratio. A similar procedure for the isolation of the plasma membranes was used for both types of squid axons. Differential centrifugation showed that at 1,500×g, the yield of membrane enzymes (Na, K-ATPase and NADH-ferricyanide oxidoreductase) from giant axon homogenates was 2 to 5 times greater than from retinal nerve homogenates, but at 105,000×g the opposite was the case, the yield from retinal axons being about two times greater. Thus, the major part of the membrane material from the retinal nerve seems to be less dense than the membrane material from giant axons. The behavior of the 105,000×g fraction from both types of fibers was studied by determining protein Na, K-ATPase, and NADH-oxidoreductase along a lineal sucrose gradient (10 to 40%; centrifuged at 40,600×g for 90 min). By any of the three measurements, retinal axons yielded a greater amount (2:1) of plasma membranes sedimenting at low sucrose concentration (16 to 25%) as compared to that observed at high sucrose concentration (35 to 38%). Giant axons, on the contrary, yielded a higher proportion of membranes (2.5:1) sedimenting at high sucrose concentrations (over 40%). The experimental data indicate that a different cellular origin can account for the behavior of nerve membranes along lineal gradient centrifugation. The membranes floating at low sucrose concentration („light membranes”) can be tentatively ascribed to the axolemma; the membranes found at high sucrose concentration („heavy membranes”) to the Schwannlemma and basement membranes. In accord with their high A/S morphological ratio, squid retinal axons yielded 5 times more light membranes (axolemma) than dissected giant axons.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01868053
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  • 7
    Electronic Resource
    Electronic Resource
    Übergangsmetall-Carben-Komplexe, LIV. Synthese von übergangsmetall-carbonyl-ylid-Komplexen aus übergangsmetall-carbonyl-carben-Komplexen (1973)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 106 (1973), S. 1262-1276 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Transition Metal Carbene Complexes, LIV. Synthesis of Transition Metal Carbonyl Ylide Complexes from Transition Metal Carbonyl Carbene ComplexesSecondary und tertiary alkylphosphines PX3 [X3 = (CH3)3, (C2H5)3, (n-C4H9)3, (CH3)2H] react with (alkoxycarbene)- or (alkylthiocarbene)pentacarbonyl complexes of chromium(0) and tungsten(0),(CO)5Cr[C(OCH3)C6H5], (CO)5W[C(OCH3)CH3] and (CO)5W[C(SCH3)CH3], at low temperatures to give the corresponding ylidepentacarbonylmetal complexes (CO)5M[C(PX3)(YCH3)(Z)] (M = Cr, W; Y = O, S; Z = CH3, C6H5) under addition of the phosphines to the carbene carbon atom. The structures of the pale yellow, diamagnetic, and partially very thermolabile compounds were established by analysis, i.r., n.m.r., and mass spectra. The partial thermal conversion of (CO)5Cr[C(P(CH3)2H)(OCH3)(C6H5)] in acetone was shown to yield (CO)5Cr{P(CH3)2[CH(OCH3)(C6H5)]}.
    Notes: Durch Umsetzung sekundärer und tertiärer Alkylphosphine PX3 [X3 = (CH3)3, (C2H5)3, (n-C4H9)3, (CH3)2H] mit den (Alkoxycarben)- bzw. (Alkylthiocarben)pentacarbonyl-Komplexen von Chrom(0) und Wolfram(0), (CO)5Cr[C(OCH3)C6H5], (CO)5W[C(OCH3)CH3] und (CO)5W[C(SCH3)CH3], bei tiefen Temperaturen wurden unter Addition der Phosphine an das Carbenkohlenstoffatom entsprechende Ylid-pentacarbonylmetall-Komplexe (CO)5 M[C(PX3) (YCH3)(Z)] (M = Cr, W; Y = O, S; Z = CH3, C6H5) erhalten. Die Strukturen der schwach gelblichen, diamagnetischen, z T. sehr thermolabilen Verbindungen wurden durch Analyse, IR-, NMR- und Massenspektren gesichert. Die partielle thermische Reaktion von (CO)5Cr[C(P(CH3)2H)(OCH3)(C6H5)] in Aceton zu (CO)5Cr{P(CH3)2[CH(OCH3)(C6H5)]} wurde nachgewiesen.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19731060423
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  • 8
    Electronic Resource
    Electronic Resource
    Übergangsmetall-Carben-Komplexe, LXIX. Isomerisierung von cis- und trans-(Alkoxycarben)tetracarbonyl-(phosphin)metall-Komplexen und Beeinflußbarkeit des Isomerisierungsgleichgewichts (1974)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 107 (1974), S. 673-679 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Transition Metal Carbene Complexes, LXIX. Isomerism of cis- and trans-(Alkoxycarbene)tetracarbonyl(phosphine)metal Complexes and Dependence of the Equilibrium ConstantsSolutions of cis- and trans-(alkoxycarbene)tetracarbonyl(phosphine)metal complexes, (CO)4M(PR3)[COR′)R″] [M=Cr, W; R3=(CH3)3, (C2H5)3, (n-C4H9)3, (n-C8H17)3, (i-C2H7)3, (C6H11)3, (C2H5)2C6H5, (C6H5)2C2H5, (C6H5)3, (p-C6H4CH3)3, (p-C6H4F)3, (m-C6H4F)3; R′=CH3, C2H5; R″=CH3, C2H5, i-C3H7, C6H7, C6H5] on heating isomerize to an equilibrium situation. The equilibrium constants are dependent upon the solvent, the central metal, the phosphine group and the carbene ligand.
    Notes: cis-u. trans-(Alkoxycarben)tetracarbonyl(phosphin)metall-Komplexe, (CO)4M(PR3)[(OR′)R′] [M=Cr, W; R3=(CH3)3, (C2H5)3, (n-C4H9)3, (n-C8H11)3, (C3H5)3, (C 6H11)3, (C2H5)2C6H5, (C2H5)2C2H5, (C6H5)3, (p-C6H4CH3)3, (p-C6H4F)3, (m-C 6H4F)3; R′=CH3, C2H5; R′=CH3, C2H5, i-C3H7, C6H5] isoerisieren beim Erwärmen in Lösung bis zu einem Gleichgewichtszustand. Die lage dieses Isomerisierungsgleichgewichts ist durch die Wahl des Lösungsmittels. des Zentralmetalls der Phosphingruppe und des Carbenliganden beeinflußbar.
    Additional Material: 6 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19741070239
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  • 9
    Electronic Resource
    Electronic Resource
    Übergangsmetall-Carben-Komplexe, LXXIV. Reversible Addition von tertiären Phosphinen an Pentacarbonyl(methoxymethylcarben)metall-Komplexe (1974)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 107 (1974), S. 2459-2467 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Transition Metal Carbene Complexes, LXXIV. Reversible Addition of Tertiary Phosphines on Pentacarbonyl(methoxymethylcarbene) Metal ComplexesThe reaction of tertiary phosphines PR3 [PR3 = P(C4H9)3, P(C2H5)2C6H5, P(i-C3H7)3] with pentacarbonyl(methoxymethylcarbene)metal complexes of chromium(O) and tungsten(O), (CO)5Cr[C(OCH3)] and (CO)5W[C(OCH3)], at low temperatures results in a reversible addition of the phosphine to the carbene ligand. The addition-dissociation-equilibrium constants depend on the temperature, the solvent, the phosphine, and the central metal.
    Notes: Bei der Umsetzung von tertiären phosphinen PR3 [PR3 = P(C4H9)3. P(C2H5)2 C6H5. P(i-C3H7)3] mit Pentacarbonyl(methoxymethylcarben)chrom(O) bzw. -wolfram(O). (CO)5Cr[C(OCH3)CH3] bzw. (CO)5W[C(OCH3)CH3], bei tiefen Temperaturen erfolgt eine Gleichgewichtskonstanten hängen von der Temperatur, dem Lösungsmittel, der Art des Phosphins und des Zentralmetalls ab.
    Additional Material: 5 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19741070806
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  • 10
    Electronic Resource
    Electronic Resource
    Übergangsmetall-Carben-Komplexe, LXVIII. Synthese von cis- und trans-Tetracarbonyl(carben)(phosphin)-Komplexen von Chrom(0) und Wolfram(0) (1974)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 107 (1974), S. 657-672 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Transition Metal Carbene Complexes, LXVIII. Synthesis of cis- and trans-Tetracarbonyl(carbene)(phosphine) Complexes of Chromium(0) and Tungsten(0)Thermal reaction in the range 60 to 80°C and photochemical reaction at room temperature of tertiary phosphines PX3 [X3=(CH3)3, (C2H5)3, (n-C8H17)3, (i-c3H7)3, (C6H11)3, (C2H5)2C6H5, (C6H5)2 C2H5, (C6H5)3, (p-C6H4CH3)3, (p-C6H4F)3, (m-C6H4F)3] with pentacarbony(carbene) complexes of chromium (0) and tungsten (0), (CO)5Cr[C(R′)R″] and (CO)4M(PR3)[C(R′)R″] and trans-(CO)4M(PR3)[C(R′)R″]. Photochemical reaction at low temperatures and in the case where R′==NH2 and NHCH3, yields only the cis-isomers. The structures of the yellow to red, diamagnetic compounds were established by analyses and spectra.
    Notes: Bei der thermischen Umsetzung von tertiären Phosphinen PX3 [X3=(CH3)3, (C2H5)3, (n-C4H9)3, (n-C8H17)3, (C3H7)3, (C6H11)2C6H5, (C6H5)2C2H5)3, (p-C6H4CH3)3- (p-C6H4F)3, (m-C 6H4F)3] mit Pentacarbonyl(carben)-Komplexen von Chrom (0) und Wolfram(0), (CO)5Cr[(R′)R″] und (CO)5W[ C(R′)R″] (R′=OCH3, OC2H5; R″==CH3, C2H5, i-C3H7, C6H5), erhält man im Temperaturbereich zwischen 60 und 80°C unter CO-Abspaltung sowohl die cis-als auch die trans-Isomeren der Tetracarbonyl(carben)-(phosphin)-Komplexe (CO)4M(PR3)[C(R′)R″]. desgleichen bei photochemischer Reaktion bei Raumtemperatur. Bei photochemischer Umsetzung bei tiefen Temperaturen und für R′=NH2 oder NHCH3 fallen jedoch nur die cis-Verbindungen an. Die Konstitutionen der gelben bis roten, diamagnetischen Verbindungen wurden analytisch und spektroskopisch gesichert.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19741070238
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