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  • 1970-1974  (16)
  • Chemistry  (15)
  • Entropy  (1)
  • Computational Chemistry and Molecular Modeling
  • Inorganic Chemistry
  • United States
  • 1
    Electronic Resource
    Electronic Resource
    Toward a molecular taxonomy (1971)
    Springer
    Journal of molecular evolution 1 (1971), S. 97-111 
    Details
    ISSN: 1432-1432
    Keywords: Molecular Evolution ; Taxonomy ; Molecular Information Measures ; Ensemble Information Source ; Entropy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The concepts of a super information source and ensemble averaging are used to estimate the amount of information stored in protein andt-RNA sequences. Specifically applied to cytochrome c and hemoglobins, information measures analogous to those found to be highly significant for DNA pair frequency data (D 2 vs.R) by Gatlin (1968) prove to be extremely highly correlated with organism complexity. Super source stability and the possible taxonomic utility of the extraordinary clusterings obtained are discussed. A restriction on the construction of ancestral sequences and a possible handle on homology are also detailed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01659397
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Use of the donnan equilibrium principle to concentrate uranyl ions by an ion-exchange membrane process (1971)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 17 (1971), S. 1006-1008 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: No. Abstract.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690170443
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    The impact of rigid spheres on rubber (1972)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 16 (1972), S. 1641-1651 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: The applicability of Hertz's theory of impact to the case of rigid spheres colliding with rubber has been studied over a wide range of impact conditions. In general, the theory is adequate; but in many practical cases, the influence of the finite thickness of the sample is significant. Using previously published data on the influence of thickness on static indentation measurements, this effect can be predicted and good agreement with experiment is found. Resilience measurements have been made over a range of impact conditions. The time of impact, rather than its severity as such, was found to be the factor governing the resilience for the unfilled materials studied, provided that there was no slip of the sample relative to its holder. Slippage can occur if the sample is too thin, due to the shear stresses developed at the rear surface, and this results in the observed resilience being anomalously low.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1972.070160705
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    The irradiation of vinyl monomers in the presence of paraffin waxes (1973)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 17 (1973), S. 2519-2522 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: The radiation-induced grafting of a series of monomers onto a wide range of paraffin waxes was attempted. Although no grafting could be achieved and only homopolymers were formed, the rates of homopolymerization were greatly enhanced in the presence of the wax. This phenomenon is ascribed to processes of energy transfer from the irradiated wax to the monomer.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1973.070170817
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  • 5
    Electronic Resource
    Electronic Resource
    Metal Complexes with Macrocyclic Ligands, IVPart III, see [1].. Synthesis, Properties and Kinetics of Complexation with Three N-methyl Substituted 1,4,8,11-tetraazacyclotetradecanes (1974)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 57 (1974), S. 1035-1042 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The synthesis, properties and complexation of 1-methyl-1,4,8,11-tetraazacyclotetradecane (1-MeCyclam-14), 1,5-dimethyl-1,5,8,12-tetraazacyclotetradecane (2-MeCyclam-14) and 1,4,8,11-tetramethyl-1,4,8,11-tetraazacyclotetradecane (4-MeCyclam-14) are described.While the Ni2+ and Cu2+ complexes of 1-MeCyclam-14 and 2-MeCyclam-14 exhibit square planar geometries, 4-MeCyclam-14 forms Ni2+ and Cu2+ complexes, whose absorption spectra are best explained by assuming pentaco-ordination of the metal ions.The complexation rate of the three N-methyl substituted macrocycles with Cu2+ and Ni2+ is slower than can be accounted for by water exchange and little affected by introducing methyl groups at the nitrogens. Both results are in contrast to what is known for open chain amine ligands. A mechanism for the complexation is proposed, which also explains why the products of the reaction of 4-MeCyclam-14 with Cu2+ and Ni2+ are pentaco-ordinated.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19740570409
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Vitamin D3 Metabolites IIPart I, see [1].. Further Syntheses of 25-Hydroxycholesterol (1974)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 57 (1974), S. 771-781 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Zwei weitere Synthesen von 25-Hydroxycholesterin (10) ausgehend von Pregnenolon (1) bzw. O-acetylpregnenolon (13) werden beschrieben. Dabei wird jedesmal auch das noch unbekannte 20(S)-25-Hydroxycholesterin (11) erhalten. Fernerhin wird ein Zusammenhang zwischen der chemischen Verschiebung der NMR.-Signale der C(21)-Methylgruppe und der Stereochemie am C(20) festgestellt.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19740570331
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  • 7
    Electronic Resource
    Electronic Resource
    Mass Spectrometry and Organic Analysis, part 14.For part 13, see [1]. The photolysis and mass spectra of medium and large ring ketones from C9 to C16Dedicated to Dr. Roger Firmenich on the occasion of his 65th birthday (1971)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 54 (1971), S. 1759-1767 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The photolysis of cyclic ketones from C9 to C16 has been carried out, and formation of cyclobutanols observed in only C11 to C16. Although in the mass spectrometer cyclobutanols are not formed, an initial transfer of a γ-hydrogen atom to the carbonyl group is shown to occur in the mass spectra of all cyclic ketones higher than C10.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19710540703
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  • 8
    Electronic Resource
    Electronic Resource
    Metal Complexes with Macrocyclic Ligands, VPart IV see [1].. Formation and dissociation kinetics of the pentaco-ordinated Ni2+, Cu2+, Co2+ and Zn2+ complexes with 1,4,8,11-tetramethyl-1,4,8,11-tetraazacyclotetradecane (1974)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 57 (1974), S. 1328-1333 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The formation and dissociation kinetics of the pentaco-ordinated Cu2+, Ni2+, Co2+ and Zn2+ complexes with 1,4,8,11-tetramethyl-1,4,8,11-tetraazacyclotetradecane (4-MeCyclam-14) was studied by pH-stat techniques and spectrophotometrically. The rates of the reactions between 4-MeCyclam-14 and each of the four metal ions, although slower than normal complexations by a factor of 103-104, closely follow the order Cu2+ 〉 Zn2+ 〉 Co2+ 〉 Ni2+, found for the rate of water exchange. This implies that beside water exchange an other constant factor plays an important role in the rate determing step. The dissociation of the pentaco-ordinated 4-MeCyclam-14 complexes is acid catalyzed. The limiting rate for acid dissociation is not reached even in 2.5M HNO3 in the case of Ni(4-MeCyclam-14)2+. From the formation and dissociation rates stability constants have been calculated, which do not show any macrocyclic effect.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19740570509
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  • 9
    Electronic Resource
    Electronic Resource
    Transition Metal Ions and Amides, VIPart V, s.[1].. Complexation of the neutral and the anionic forms of 3, 7-diazanonanedioic acid diamide and 3, 7-diazanonanedioic acid diethylamide with Cu2+ and Ni2+ (1974)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 57 (1974), S. 286-293 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Two tetradentate ligands, 3, 7-diazanonanedioic acid diamide (DANA) and 3, 7-diazanonanedioic acid diethylamide (DANEA) have been synthesized and their complexes with Cu2+ and Ni2+ studied potentiometrically and spectrophotometrically. Three monomeric species, ML, MH-1L, and MH-2L, are formed. In ML, the two carbonyl oxygens are bound to the metal ions. Whilst Cu2+ gives complexes CuH-1DANA+ and CuH-1DANEA+ with one deprotonated amide group, the corresponding Ni2+ chelates do not exist in detectable concentrations. CuH-2DANA and NiH-2DANA are formed below pH 9. In the case of the diethyl derivative DANEA, however, steric interaction strongly hinders coordination of two deprotonated amide groups.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19740570203
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  • 10
    Electronic Resource
    Electronic Resource
    N-Carbobenzoxy-L-pyroglutamyl-L-histidyl Peptides (1973)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 56 (1973), S. 1656-1661 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: N-Benzyloxycarbonyl-L-pyroglutamyl-L-histidyl-peptide reagieren mit Methanol unter Bildung von N-Benzyloxycarbonyl-L-(05-methyl)glutamyl-L-histidyl-peptiden (Hauptprodukte) und L-Pyroglutamyl-L-histidyl-peptiden (Nebenprodukte), wenn die basische Histidin-Seitenkette nicht protoniert ist. Solche basenkatalysierte Methanolysen. wurden an einem Di- und an einem Tripeptid-Amid beobachtet. Die entsprechende Äthanolyse verlauft wesentlich langsamer.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19730560522
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