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  • Chemistry  (32)
  • Polymer and Materials Science  (19)
  • Physics  (5)
  • 1975-1979  (37)
  • 1970-1974
  • 1965-1969
  • 1975  (37)
  • 1
    Electronic Resource
    Electronic Resource
    New structures of LD-alternating polypeptides in solution and in the solid state (1975)
    New York : Wiley-Blackwell
    Biopolymers 14 (1975), S. 1109-1114 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.1975.360140518
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  • 2
    Electronic Resource
    Electronic Resource
    Electron impact mass spectral studies of hydrazine monoamine oxidase inhibitor drugs (1975)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 2 (1975), S. 82-89 
    Details
    ISSN: 1052-9306
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Identification of hydrazine monoamine oxidase inhibitor drugs such as isoniazid, iproniazid, nialamide, isocarboxazid and iproclozide is made by electron impact mass spectrometry using the direct insertion technique. The molecular ion itself, although of low relative abundance, is found in the mass spectra of all compounds studied. Relative intensities of the major fragments and data on metastable ions useful in the identification of these compounds are reported. With the aid of synthesized structurally related products, deuterium labelling of exchangeable hydrazidic and hydrazinic protons and by the use of hexadeuterated isopropylic analogues, detailed information about fragmentation patterns is obtained. Splitting processes are chiefly governed by the nature of the aromatic substituent at the hydrazidic end and the alkyl sidechain located at the second hydrazinic nitrogen. The major fragmentations occurring are loss of small neutral molecules, double rearrangement, cleavage of the N—N bond, amide bond rupture, β-cleavage to the hydrazinic nitrogen atom and McLafferty rearrangements.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bms.1200020204
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  • 3
    Electronic Resource
    Electronic Resource
    Carbon-13 NMR spectroscopy of hop bitter substances (1975)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 7 (1975), S. 415-417 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The 13C NMR spectra of the most important hop bitter substances are analysed. All individual carbon atoms are assigned, except the oxygen bonded sp2 carbon atoms. Most assignments are made partly by comparison with analogous compounds and partly by reference to literature data. Cross-correlations with the 1H NMR shifts are made for two main products and confirm the correctness of the assignments. All data are in agreement with the known structures.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270070904
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  • 4
    Electronic Resource
    Electronic Resource
    Synthesis of sequential polypeptides containing L-azetidine-2-carboxylic acid residues (1975)
    New York : Wiley-Blackwell
    Biopolymers 14 (1975), S. 2211-2230 
    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 sequential polypeptides with the repeating sequences Aze-Pro-Aze, Pro-Aze-Pro, Pro-Aze-Gly, Aze-Pro-Gly, Ala-Aze-Gly, Aze-Ala-Gly, and Pro-Pro-Gly are reported. The polymers were prepared by the active ester method, using the p-nitrophenyl, pentachlorophenyl, and N-hydroxysuccinimide esters as the polymerizable tripeptide derivatives. Except for poly(Ala-Aze-Gly) obtained via the N-hydroxysuccinimide ester, all polymers were isolated in good yields and have weight-average molecular weights in the range 10,000-30,000. The molecular weights have been determined by applying the calibrated gel chromatography system described by Fairweather et al. [J. Chromatogr. (1972) 67, 157] and by viscometry. All di- and tripeptide intermediates were chemically and optically pure.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.1975.360141016
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  • 5
    Electronic Resource
    Electronic Resource
    On the application of polyelectrolyte limiting laws to the helix-coil transition of DNA. III. Dependence of helix stability on excess univalent salt and on polynucleotide phosphate concentration for variable equivalent ratios of divalent metal ion to phosphate (1975)
    New York : Wiley-Blackwell
    Biopolymers 14 (1975), S. 1407-1422 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Using the free energy difference between double-helix and random-coil forms of DNA as a measure of the stability of the double helix, we calculate the dependence of the stability on excess univalent cation concentration and on polynucleotide phosphate concentration, both as functions of the equivalent ratio r of divalent cation-to-phosphate concentrations. The theoretical tool is merely to compare the free energy of one polyelectrolyte solution, characterized by the polyelectrolyte linear charge density, with the free energy of another, characterized by a different value of the charge density. It is assumed only that the charge density of the double helix is greater than that of the coil form. The calculation represents the only molecular theory given to date (for r ≠ O) for these aspects of helix stability.We find that, as excess univalent cation concentration increases, the helix stability increases if r is small but decreases if r is large (i.e., of the order of unity). Moreover, as the concentration of nucleotide phosphate increases, the helix stability does not change for small values of r but increases for large values. For both effects, a continuous transition as a function of r bridges the low-r and high-r behaviour.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.1975.360140708
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  • 6
    Electronic Resource
    Electronic Resource
    Conformational analysis of polynucleotide chains. Double-stranded structures (1975)
    New York : Wiley-Blackwell
    Biopolymers 14 (1975), S. 1667-1684 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Conformational analysis of double-stranded helical polynucleotides was carried out in terms of internal and external parameters, using semiempirical energy potential functions. The results obtained show that the structures proposed on the basis of the X-ray analysis for A-DNA and RNA's are almost identical to those corresponding to the conformational energy minima, whereas that proposed for B-DNA still appears to suffer from conformational strains. On the other hand, the B-DNA structure theoretically predicted is stabilized by both van der Waals energy and possible specific interactions with water molecules and counterions. This may explain the stability of the B form with respect to the A form at high relative humidity and ion strength. A possible role of the A + T fraction in stabilizing the B-type DNA emerges in connection with its preferential ability to bind ions. This agrees with the results on the crystalline structures of GpC and ApU. For RNA's, the occurrence of only A-type structures is explained as being due to the C(3′)-endo puckering of ribose in a double helix.
    Additional Material: 13 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.1975.360140810
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  • 7
    Electronic Resource
    Electronic Resource
    Transient electric birefringence of sonicated DNA (1975)
    New York : Wiley-Blackwell
    Biopolymers 14 (1975), S. 2441-2443 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.1975.360141119
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  • 8
    Electronic Resource
    Electronic Resource
    Kondensierte Isochinoline, XI. Imidazo[5,1-a]isochinoline (1975)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 108 (1975), S. 3771-3779 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Condensed Isoquinolines, XI. Imidazo[5,1-α]isoquinolinesSyntheses of imidazo[5,1-a]isoquinolines (14), starting from 1-isoquinolinecarbonitrile (2), are described. Preparations of the parent compound or of derivatives with substituents in 3-position are carried out via 1-(aminomethyl)isoquinoline (3), whereas derivatives with substituents in 1-position or in 1- and 3-positions are prepared via 1-acylisoquinolines (1). 3-Oxo-2,3-dihydro derivatives (17) are formed by heating 1 with ammonium formate.
    Notes: Synthesen von Imidazo[5,1-a]isochinolinen (14), ausgehend von 1-Isochinolincarbonitril (2), werden beschrieben. Die Darstellung der Stammverbindung oder von Derivaten mit Substituenten in 3-Stellung erfolgt über 1-(Aminomethyl)isochinolin (3). während in 1-Stellung substituierte oder in 1,3-Stellung disubstituierte Derivate über 1-Acylisochinoline (1) bereitet werden. 3-Oxo-2,3-dihydro-Derivate (17) entstehen beim Erhitzen von 1 mit Ammoniumformiat.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19751081210
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  • 9
    Electronic Resource
    Electronic Resource
    Zur Frage der Homokonjugation in Triquinacen und 2a,4a,8a,8b-Tetrahydrocyclopent [cd]azulen. Photoelektronenspektroskopische Untersuchungen (1975)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 108 (1975), S. 1218-1223 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: On the Homoconjugation in Triquinacene and 2a,4a,8a,8b-Tetrahydrocyclopent[cd]azulene. Photoelectronspectroscopic InvestigationsThe photoelectron spectra of dihydrotriquinacene (3) and 2a,4a,8a,8b-tetrahydrocyclopent[cd]-azulene (4) have been investigated. The resonance integral which is a measure for the homoconjugation between the isolated double bonds in 3 and 4 was found to be β′ 〉 -0.35 eV. The interaction integral between the a “ orbital of the butadiene moiety and the a” linear combination of the isolated double bonds in 4 can not be determined by means of photoelectron spectroscopy.
    Notes: Die Photoelektronenspektren von Dihydrotriquinacen (3) und 2a,4a,8a,8b-Tetrahydrocyclopent-[cd]azulen (4) wurden untersucht. Das Wechselwirkungsintegral, das die Homokonjugation zwischen den isolierten Doppelbindungen in 3 und 4 beschreibt, beträgt β′ 〉 -0.35 eV. Das Wechselwirkungsintegral zwischen dem a “-Orbital des Butadienteils und der a”-Kombination der isolierten Doppelbindungen in 4 läßt sich mit Hilfe der Photoelektronenspektroskopie nicht bestimmen.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19751080428
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  • 10
    Electronic Resource
    Electronic Resource
    Notiz über eine verbesserte Darstellung von Isocarbostyril und Carbostyril (1975)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 108 (1975), S. 3898-3899 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19751081223
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