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  • 1965-1969  (12)
  • 1
    Electronic Resource
    Electronic Resource
    The Effect of Including Non-Nearest Neighbor β Terms in Pariser-Parr-Pople Type Self-Consistent Molecular Orbital Calculations on π-Electron Systems (1967)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 89 (1967), S. 525-528 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja00979a009
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  • 2
    Electronic Resource
    Electronic Resource
    The similarity of atomic radius of palladium(II) and palladium(IV) (1966)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 21 (1966), S. 440-442 
    Details
    ISSN: 0001-5520
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0365110X66003116
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  • 3
    Electronic Resource
    Electronic Resource
    Control of Growth of Axenic Cultures of Mammalian Cells by Serum Lipids (1968)
    [s.l.] : Nature Publishing Group
    Nature 219 (1968), S. 300-300 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] This procedure was applied to calf serum which was then tested for residual lipid content. Charcoal-treated calf serum (2 ml.) and 2 ml. of native calf serum were extracted three times with 2 ml. of ether. Evaporation of the ether and drying over P2O5 in a vacuum gave 0.10 and 0.50 mg of residues ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/219300a0
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  • 4
    Electronic Resource
    Electronic Resource
    Interconnexion of Silicon in Modified Aluminium–Silicon Eutectic (1965)
    [s.l.] : Nature Publishing Group
    Nature 208 (1965), S. 177-177 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] All the theories presented so far claim that the fine dispersion of silicon particles is produced by an increased nucleation frequency of silicon particles at a temperature lower than the equilibrium eutectic temperature. The lowering of the temperature is attributed to either a reduction in the ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/208177a0
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  • 5
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    Unknown
    Bernard Farber, Comparative Kinship Systems. A Method of Analysis (Book Review) (1969)
    Leiden : Periodicals Archive Online (PAO)
    International Journal of Comparative Sociology. 10 (1969) 198 
    Details
    ISSN: 0020-7152
    Topics: Sociology
    Notes: Book Reviews
    URL: http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pao:&rft_dat=xri:pao:article:h099-1969-010-00-000022
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  • 6
    Electronic Resource
    Electronic Resource
    The inclusion of non-nearest neighbor ß terms in pariser-parr-pople type S.C.M.O. calculations (1967)
    Springer
    Theoretical chemistry accounts 8 (1967), S. 203-211 
    Details
    ISSN: 1432-2234
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Résumé Le calcul des propriétés des électrons π par une méthode S.C.M.O. tenant compte de tous les termes β coeur a été étendu aux systèmes contenant de l'azote et de l'oxygène. Les transitions électroniques singulet π→π* et les potentiels d'ionisation (lorsqu'ils sont connus) sont en accord raisonnable avec l'expérience. Les résultats sont comparés aux calculs non-empiriques de tous les électrons effectués par Clémenti pour le pyrrole, la pyridine et la pyrazine.
    Abstract: Zusammenfassung Die Berechnung von π-Elektronen-Eigenschaften mittels einer SCMO-Methode, die alle β core-Terme einschließt, wurde auf Systeme mit Stickstoff- und Sauerstoffatomen ausgedehnt. Die Singulett-π→π *-Übergänge und π-Ionisierungsenergien sind in vernünftiger Übereinstimmung mit dem Experiment. Es wird einen Vergleich mit den nichtempirischen Rechnungen mit allen Elektronen von Clementi an Pyrrol, Pyridin und Pyrazin angestellt.
    Notes: Abstract The calculation of π-electron properties by an S.C.M.O. method including all β core terms has been extended to nitrogen and oxygen containing systems. The singlet π * →π electronic transitions and π-ionization potentials (where available) are in reasonable agreement with experiment. A comparison is made with the non-empirical all electron calculations of Clementi for pyrrole, pyridine and pyrazine.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00527305
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  • 7
    Electronic Resource
    Electronic Resource
    Some comments on the parameter choices for S.C.M.O. calculations on five membered heteroatomic π-electron systems (1968)
    Springer
    Theoretical chemistry accounts 10 (1968), S. 1-12 
    Details
    ISSN: 1432-2234
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Bei den üblichen semiempirischen SCMO-Rechnungen an Heteroaromaten ergeben sich unerwartete Abhängigkeiten der Ladungsverteilung von den β Rumpf-Termen [1]. Die gebräuchlichste Parameterwahl führt zu chemisch unverständlichen Ladungsverteilungen bei Furan und Pyrrol [2]. Es wird gezeigt, daß der erste Effekt mit der relativen Größe der Diagonalelemente der Fockmatrix zusammenhängt; der zweite Effekt hängt sehr stark von den Nichtnachbarelementen ab: Bei Einschluß von Nichtnachbar-β Rumpf-Termen und entsprechender Parameterwahl erhält man befriedigende Ladungsverteilungen.
    Abstract: Résumé Il a été indiqué [1] que le traitement semi-empirique S.C.M.O. habituel des systèmes d'électrons π dans les hétérocycles comporte des relations in attendues entre la distribution de charge et les termes β coeur impliquant les hétéroatomes. D'autres chercheurs [2] ont affirmé que les choix les plus communs de paramètres fournissent des densités de charge dans le furane et le pyrrole déraisonnables sur le plan chimique. On montre ici que le premier effet est lié aux grandeurs relatives des éléments diagonaux de la matrice de Fock et que le second effet dépend fortement des éléments non immédiatement voisins de cette matrice, mais peut être annulé avec certains choix de paramètres par introduction des termes non voisins β coeur dans les calculs.
    Notes: Abstract It has been reported [1] that the usual semi-empirical S.C.M.O. treatments of heteroatomic π-electron systems yield unexpected dependencies of charge distribution on the β core terms involving the heteroatoms. Other workers [2] have claimed that the most usual choices of parameters yield chemically unreasonable charge densities in furan and pyrrole. It is shown here that the first effect is related to the relative magnitudes of the diagonal elements of the Fock matrix and that the second depends very strongly on the nonnearest neighbor F matrix elements but can be overcome with certain parameter choices by the inclusion of non-nearest neighbor β core terms in the calculations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00529038
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  • 8
    Electronic Resource
    Electronic Resource
    On the dynamic mechanical behaviour of drawn poly(ethylene terephthalate) fibers (1968)
    Springer
    Colloid & polymer science 228 (1968), S. 54-58 
    Details
    ISSN: 1435-1536
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Zusammenfassung Der Einfluß von Verstreckung und Temperaturbehandlung auf den α-Übergang in Poly(äthylenterephthalat), PET, Garn wurde untersucht unter Anwendung von Röntgen- und dynamisch-mechanischen Methoden. Es wurde gefunden, daß für hohe Vergütungstemperaturen verstreckte, kristalline PET-Garne eine Verschiebung des α-Überganges zu niedrigeren Temperaturen aufweisen, ähnlich wie für nicht verstrecktes, kristallines PET. Der Hauptunterschied zwischen verstreckten und nicht verstreckten Garnen ist die Lage des α-Überganges auf der Temperaturskala; der α-Übergang liegt für höhere Verstreckung bei höheren Temperaturen. Die Verlagerung des α-Überganges durch Temperaturbehandlung wird auf die Anzahl der Kristallite zurückgeführt, während seine Verschiebung durch Verstreckung erklärt wird durch die Orientierung in den amorphen Bezirken.
    Notes: Abstract The effect of drawing and annealing treatments on the α transition in poly(ethylene terephthalate), PET, yarns has been studied using a combination of X-ray and dynamic mechanical techniques. It was found that drawn, crystalline PET yarns exhibit a shift in the position of the α transition to lower temperatures for high annealing temperatures; this effect has been observed for unoriented, crystalline PET. The main difference between the results for the drawn and unoriented yarns lies in the position of the α transition on the temperature scale; the α transition occurs at higher temperatures the higher the draw ratio. The shift in the position of the α transition with anealing is interpreted in terms of the number of crystals whilst the change in position of the α transition brought about by drawing is explained by orientation in the amorphous regions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02125764
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  • 9
    Electronic Resource
    Electronic Resource
    Synergism of organophosphates in Musca domestica and Chrysomya putoria (1967)
    Springer
    Entomologia experimentalis et applicata 10 (1967), S. 263-269 
    Details
    ISSN: 1570-7458
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Zusammenfassung Eine Reihe symmetrisch dreifach substituierter Phosphorverbindungen wurde als Synergisten für Malathion und gewisse andere Organophosphat-Insektizide gegenüber resistenten und normalen Stämmen von Chrysomya putoria und Musca domestica geprüft. Alle diese Verbindungen verstärkten die Insektizide gegen resistente Stämme wirkungsvoller als gegen normale. Das galt besonders für Malathion, vor allem bei dem C. putoria-Stamm, dessen Resistenz gegenüber Malathion hoch spezifisch ist. Ein 5:1-Gemisch der besten Synergisten hob seine Resistenz praktisch auf. Unter den geprüften “Synergisten” waren die zwei besten C. putoria und den beiden verschiedenen resistenten Stämmen von M. domestica gemeinsam; diese beiden Synergisten wirkten auch gegenüber Culex tarsalis-Larven ausgezeichnet, wie andere Autoren berichteten. Neben der synergistischen Wirksamkeit für Malathion reduzierten die besseren Verbindungen auch die Resistenz anderer Phosphor-Insektizide (Dicapthon, Parathion, Coumaphos), wenn auch nicht ganz so vollkommen. Es wird geschlossen, daß ihre Wirkungsweise für die Unterdrückung der Carboxyesterase-Entgiftung nicht ganz spezifisch ist.
    Notes: Abstract A series of symmetrical trisubstituted phosphorus compounds was tested as synergists for malathion and certain other organophosphorus insecticides against resistant and normal strains of Chrysomya putoria and Musca domestica. All the compounds synergised the insecticides more effectively against resistant than normal strains. This was especially true with malathion, notably with the C. putoria strain the resistance of which is highly specific for malathion. A 5:1 mixture of the best synergists virtually abolished its resistance. Among the “synergists” tested, the two best were common to the C. putoria and the two different resistant strains of M. domestica; these two synergists were also outstanding against Culex tarsalis larvae, as reported by other authors. In addition to the synergistic action on malathion, the better compounds were also effective in reducing resistance to other phosphorus insecticides (Dicapthon, parathion, coumaphos) though not quite so effectively. It is concluded that their action is not entirely specific for suppressing carboxyesterase detoxication.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00302247
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  • 10
    Electronic Resource
    Electronic Resource
    Multiple melting in nylon 66 (1968)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-2: Polymer Physics 6 (1968), S. 1773-1781 
    Details
    ISSN: 0449-2978
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Either of the two endothermic melting peaks found by differential thermal analysis of nylon 66 may be converted to the other by appropriate choice of annealing conditions. The two peaks are considered due to the melting of two morphological species, forms I and II. Form I is relatively fixed in melting temperature, while the form II melting temperature varies with annealing conditions and can be either above or below form I. The two forms can be distinguished by whether or not the conversion I → II takes place; if the sample is in form II no change in the thermogram is observed under suitable conversion conditions. The conversion of form I to form II also takes place during cold drawing. It has been previously shown that form I results from rapid cooling from the melt, and form II results from slow cooling. Form I appears to be kinetically favored, while form II is thermodynamically preferred. The variability in the form II melting point is attributed to variable crystal size and/or perfection.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1968.160061007
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