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  • Chemistry  (36)
  • 1970-1974  (36)
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  • 1
    Electronic Resource
    Electronic Resource
    Sequential oligopeptides. Conformational studies of the oligopeptides and a polypeptide with the repeating sequence L-norvalyl-glycyl-L-proline (1974)
    New York : Wiley-Blackwell
    Biopolymers 13 (1974), S. 1067-1078 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Conformational studies of a series of oligopeptides (from the tripeptide to the octadecapeptide) with the repeating sequence L-norvalyl-glycyl-L-proline and a polytripeptide with this sequence are reported. By means of chiroptical techniques, unordered conformations are found for all oligopeptides in water, trifluoroethanol, and ethylene glycol and for the water-insoluble polymer in trifluoroethanol. In ethylene glycol the polymer assumes a collagen-like structure. Infrared studies indicate that all the oligomers, in contrast to the polymer, are unordered in the solid state.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.1974.360130519
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  • 2
    Electronic Resource
    Electronic Resource
    Circular dichroism of DNA: Temperature and salt dependence (1972)
    New York : Wiley-Blackwell
    Biopolymers 11 (1972), S. 761-779 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The temperature dependence of the circular dichroism and ultraviolet absorbance of calf thymus DNA and poly dAT were measured in aqueous solutions of various 1-1 electrolytes. Although there was very little change in absorbance, the circular dichroism changed dramatically as a function of both temperature and solvent. There is a correlation of the heat of hydration of the cation and the magnitude of the temperature dependence of the circular dichroism. Our results are interpreted in terms of a large number (possibly a continuum) of intermediate secondary structures.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.1972.360110404
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  • 3
    Electronic Resource
    Electronic Resource
    Sequential oligopeptides. Synthesis and characterization of the oligopeptides and a polypeptide with the repeating sequence L-norvalyl-glycyl-L-proline (1974)
    New York : Wiley-Blackwell
    Biopolymers 13 (1974), S. 1055-1066 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The synthesis and characterization of a series of oligopeptides (from the tripeptide to the octadecapeptide) with the repeating sequence L-norvalyl-glycyl-L-proline and a polytripeptide with this sequence are reported. The oligomers were synthesized step by step using the mixed anhydride method. All the products were chemically and optically pure. The polymer was prepared by the active ester method, using the p-nitrophenyl ester as the polymerizable tripeptide derivative. Good yield of relatively high average molecular-weight polymer was obtained. In the accompanying paper conformational investigations, both in solution and in the solid state, on the oligomers and the polymer are described.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.1974.360130518
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  • 4
    Electronic Resource
    Electronic Resource
    Synthese natürlicher Dibenzo-α-pyrone, I. Synthese des Autumnariniols und des Autumnariniols (1974)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 107 (1974), S. 3874-3877 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis of Natural Dibenzo-α-pyrones, I. Synthesis of Autumnariol and AutumnariniolThe first synthesis of 3,7-dihydroxy-1-methyldibenzo-α -pyrone (Autumnariol, 1) and 3,7-dihydroxy-4-methoxy-1- methyldibenzo-α-pyrone (Autumnariniol, 2) is described.
    Notes: Die erste Synthese von 3,7-Dihydroxy-1-methyldibenzo-α- pyron (Autumnariol, 1) und 3,7-Dihydroxy-4-methoxyl-1-methyldibenzo-α-pyron (Autumnariniol, 2) wird beschrieben.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19741071217
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  • 5
    Electronic Resource
    Electronic Resource
    Zur Photochemie von 9-Oxa-tricyclo[4.2.1.02.5]nonadienen; Synthese von Derivaten des 9-Oxa-homokubans (1972)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 105 (1972), S. 3078-3093 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Photochemistry of 9-Oxa-tricyclo[4.2.1.02.5]nonadienes; Synthesis of 9-Oxa-homocubane DerivativesThe photochemistry of methoxycarbonyl-substituted 9-oxa-tricyclo[4.2.1.02.5]nonadienes (6) has been investigated. Direct irradiation of 6a, b, c involves three different reaction pathways affording the dimers 7a, b, c, the fragmentation products 8a, b, c, 9, and the isomers 10a, b, c. The benzophenone-sensitized excitation of 6a, b, c yields in addition to 7a, b, c and 10a, b, c the 9-oxa-homocubane derivatives 18a, b, c. Either by direct or triplet-sensitized irradiation the rearrangement 6 → 10 is shown to be reversible. In a mechanistic interpretation of the transformations 6 ⇄ 10 and 6 → 18 the bis-allyl radical 20 is proposed to be a common intermediate. The spectral data of the photoproducts - including the n.m.r.-analysis of the homocubanes 18 - are briefly discussed.
    Notes: Die Photochemie von methoxycarbonyl-substituierten 9-Oxa-tricyclo[4.2.1.02.5]nonadienen (6) wurde untersucht. Bei der direkten Belichtung reagieren 6a, b, c auf drei verschiedenen Wegen zu den Dimeren 7a, b, c, den Fragmentierungs-Produkten 8a, b, c, 9 und den Isomeren 10a, b, c. Zusätzlich zu 7a, b, c und 10a, b, c werden bei der benzophenon-sensibilisierten Anregung von 6a, b, c die Oxa-homokubane 18a, b, c gebildet. Es wird gezeigt, daß die Isomerisierung 6 → 10 bei direkter oder triplett-sensibilisierter Belichtung reversibel ist. In einer mechanistischen Deutung der Umwandlungen 6 ⇄ 10 und 6 → 18 wird das Bisallyl-Radikal 20 als ein gemeinsames Intermediärprodukt vorgeschlagen. Die spektroskopischen Daten der Photoprodukte - einschließlich der NMR-Analyse der Homokubane 18 - werden kurz diskutiert.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19721050931
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  • 6
    Electronic Resource
    Electronic Resource
    Diastereomere mit drei benachbarten Phenylgruppen, II. Konfigurative Zuordnung der (±)-3-Amino-1.2.3-triphenyl-propanole-(1) und ihrer Derivate (1971)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 104 (1971), S. 131-137 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Diastereomers with Three Neighbouring Phenyl Groups, II. Configurational Assignment of (±)-3-Amino-1,2,3-triphenyl-1-propanols and some DerivativesTreatment of the diastereomerie 3-amino, 3-benzylamino- (both with known configuration at C-2,3) and 3-methylamino-1,2,3-triphenyl-1-propanols (1-3) with formalin and formic acid led to their methylation. From the erythro(2.3)-amino- and one of the methylaminopropanols in addition to the methylated derivatives the same 3-methyl-4,5,6-triphenyl-tetrahydro-1,3-oxazine (6) is obtained. All aminopropanols with the exception of the N,N-disubstituted erythro(2.3)-derivative exhibit intramolecular OH … N hydrogen bonding in their i.r. spectra. The relative configuration of the studied compounds is assigned on the basis of the above results.
    Notes: Beim Behandeln mit Formalin und Ameisensäure werden die l. c.1) beschriebenen diastereomeren Paare von 3-Amino-, 3-Benzylamino- (beide mit bekannter relativer Konfiguration an C-2,3) und 3-Methylamino-1.2.3-triphenyl-propanole-(1) (1-3) methyliert. Das erythro-(2.3)-Amino- und eines der Methylaminopropanole ergeben dabei das gleiche 3-Methyl-4.5.6-triphenyl-tetrahydro-1.3-oxazin (6). Die IR-Spektren zeigen, daß die gewonnenen Aminopropanole mit Ausnahme des N.N-disubstituierten erythro(2.3)-Produkts eine intramolekulare Wasserstoffbrücke OH…N besitzen. - Auf Grund dieser Befunde werden die relativen Konfigurationen der untersuchten Verbindungen zugeordnet.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19711040117
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  • 7
    Electronic Resource
    Electronic Resource
    Steroidsaponine mit mehr als einer Zuckerkette, IX. Purpureagitosid, ein bisdesmosidisches 22-Hydroxyfurostanol-Glycosid aus den Blättern von Digitalis purpurea L. (1974)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 107 (1974), S. 2828-2834 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Steroid Saponins with More than One Sugar Chain, IX. Purpureagitoside, a Bisdesmosidic 22-Hydroxyfurostanol Glycoside from the Leaves of Digitalis purpurea L.Purpureagitoside was isolated as the genuine glycoside from the leaves of Digitalis purpurea L. and shown to be a bisdesmosidic 22-hydroxyfurostanol derivative. Removal of the D-glucose from the OH at C-26 of the aglycon yielded the already known spirostanol saponin F-gitonin.
    Notes: Purpureagitosid wurde als genuines Glycosid aus den Blättern von Digitalis purpurea L. isoliert und als bisdesmosidisches 22-Hydroxyfurostanol-Derivat erkannt. Bei der Abspaltung der D-Glucose vom OH an C-26 des Aglyconanteils entstand das schon bekannte Spirostanolsaponin F-Gitonin.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19741070905
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  • 8
    Electronic Resource
    Electronic Resource
    Styrene/p-methoxystyrene random copolymers. Part III. Some remarks on dilute solution properties (1973)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 164 (1973), S. 273-282 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Statistische Copolymere aus Styrol und p-Methoxystyrol mit drei verschiedenen Zusammensetzungen und Poly(p-methoxystyrol) wurden durch Viskositätsmessungen in einigen Lösungsmitteln (gute und Θ-Lösungsmittel einbegriffen) bei verschiedenen Temperaturen untersucht.Die FLORYsche Konstante wurde unter Anwendung der üblichen Theorien berechnet. Die für die Copolymeren erhaltenen Werte stimmen mit den „idealen“ Werten nicht überein und sind unabhängig von der Temperatur.Die Messungen in Θ-Lösungsmitteln zeigen, daß sich die Konformationen der Copolymeren manchmal von der Konformation eines GAUSS-Knäuels unterscheiden.
    Notes: Styrene/p-methoxystyrene random copolymers of three different compositions and poly(p-methoxystyrene) have been examined by viscosity measurements in some solvents (including good and Θ solvents) at different temperatures.Current theories have been applied to evaluate the FLORY constant KΘ; the values obtained for the copolymers are quite different from the “ideal” values and are independent on the temperature.The measurements in Θ solvents suggest that the conformations of the copolymers differ sometimes from the GAUSSian coil conformation.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1973.021640125
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  • 9
    Electronic Resource
    Electronic Resource
    Conformational properties of homo-oligo(L-leucine)s in solution. Comparison with isoleucines (1974)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 175 (1974), S. 1665-1668 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1974.021750525
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  • 10
    Electronic Resource
    Electronic Resource
    New highly efficient initiators for the copolymerization of 1,3-dioxolane with 1,3,5-trioxane based on the derivatives of trifluoromethanesulfonic acid (1973)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 172 (1973), S. 243-247 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1973.021720124
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