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  • 1
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Biochemistry 34 (1995), S. 15906-15917 
    ISSN: 1520-4995
    Source: ACS Legacy Archives
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 344 (1990), S. 113-114 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Journal of statistical physics 15 (1976), S. 255-261 
    ISSN: 1572-9613
    Keywords: Statistical thermodynamics ; thermodynamic quantities ; oscillator with positive anharmonicity ; quartic oscillator
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract In the present study we investigate the statistical thermodynamics of the anharmonic oscillator, whose energies are characterized by the potential 1/2x 2+λx 4. Employing the energies recently obtained by Hioe and Montroll, we compute the partition function and the thermodynamic quantities for the anharmonic and quartic oscillators. Low- and high-temperature formulas are presented for the thermodynamic quantities of the oscillators.
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  • 4
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Cellular Physiology 138 (1989), S. 121-128 
    ISSN: 0021-9541
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: Rat pheochromocytoma PC12 cells respond to the binding of nerve growth factor (NGF) and basic fibroblast growth factor (bFGF) by extending neurites in a manner resembling sympathetic neurons. This response requires cell attachment to an appropriate substratum (Fujii et al., J. Neurosci., 2:1157, 1982); attachment factors which function in this capacity include the adhesive proteins fibronectin and laminin. Incubating PC12 cells with a ployclonal antiserum directed against a putative 140-kDa fibroblast cell surface fibronectin receptor (anti-gp140) perturbed spreading but not attachment of the cells to fibronectin and laminin substrates. However, in the presence of anti-gp 140 or its Fab fragments, NGF-stimulated neurite outgrowth was dramatically reduced. The antibody also caused a retraction of previously extended neurites. SDS-PAGE analysis of immunoprecipitates of PC12 cells surface labeled with 125I identified a prominent 120-140-kDa band, suggesting that the site of anti-gp 140 action in PC12 cells is also through a fibronectin receptor.
    Additional Material: 7 Ill.
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  • 5
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Biopolymers 13 (1974), S. 1873-1882 
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Helix probability profiles are calculated for collagen models that take into account specific sequence and unwinding from the ends, by internal loops and by chain dissociation, using parameters from a previous study and the technique of the previous paper.2 An analysis is made of the occurrence of imino acids in known collagen sequences and no significant difference is found from random occurrence. Studies of model sequences generated by random placement of the imino acids show no tendency for collagen to unwind via internal loops even when one end is covalently linked and a loop is permanently nucleated at that end.
    Additional Material: 4 Ill.
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  • 6
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Interpreting the data of Kobayashi et al.1 on the thermal transitions of triple helices of (gly-pro-pro)n for n = 10, 15, and 20 using a simple model of unzippering and chain dissociation, the thermodynamic parameters characterizing gly-pro-pro triple-helix formation have been determined. The enthalpy and entropy of triple-helix formation per repeating unit are found to be -7.4 ± 0.8 kcal/mol and -20 ± 2 eu, respectively. Using these parameters, the nature of the unwinding has been investigated for chains containing up to 300 triplets; it is found that there is only a minor amount of helix unwinding from the ends, the major change in helical content arising from chain dissociation. Experimental data on the melting temperatures of natural collagens as a function of imino-acid composition are used together with the thermodynamic parameters for (gly-pro-pro)n to estimate the thermodynamic parameters for triple-helix formation of amino versus imino acids (the parameters for the former being found to be similar to those for α-helix formation). Calculations are given using these parameters for model specific-sequence collagens; it is found that heterogeneity can have a significant influence on the nature of the unwinding of the triple helix.
    Additional Material: 11 Ill.
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  • 7
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 118 (1985), S. 4946-4964 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Inorganic Reactions of the Clusters FeCo2S(CO)9, HFe2CoS(CO)9, and H2Fe3S(CO)9The clusters FeCo2S(CO)9 (1), HFe2CoS(CO)9 (2), and H2Fe3S(CO)9 (3) were investigated with respect to metal exchange, nitrosation, and reactivity of the anionic clusters obtained towards diverse organoelement halides. The metal exchange reagent Fe(CO)42- caused the conversion of 1 into 2 and of FeCoMoSCp(CO)8 (4) into HFe2MoSCp(CO)8 (5). NiCp2 converted 3 to HFe2NiSCp(CO)6 (6) and FeNi2SCp2(CO)3 (7). With HNO2, like the known Fe2CoS(CO)8NO (8) from 2, HFe3S(CO)8NO (9) was accessible from 3. A structure determination of 8 confirmed the true isosterism of this complex with 1 and the dianion of 3 due to the very small influences upon variation of the metal atoms, the charge, and the ligands. By reaction of K2Fe3S(CO)9 with main group element halides the doubly bridged clusters Fe3(S,X)(CO)9 (10, X = μ2-SnMe2; 11, X = μ3-PPh, -PTol, -AsMe, -S, -SO) were formed. The noble metal reagents [R3P · MHal]n with M = Cu, Ag, Au allowed a cluster expansion starting from the anions of the hydrido metal clusters forming sulfur-bridged tetra- and pentanuclear clusters with Fe3Cu, Fe2CoAu, Fe2NiAu as well as Fe3Cu2 Fe3Ag2, and Fe3Au2 frameworks. The structure determination of (Ph3PAu)2Fe3S(CO)9 (16) yielded indications concerning the mechanism of the cluster expansion reaction.
    Notes: Die Cluster FeCo2S(CO)9 (1), HFe2CoS(CO)9 (2) und H2Fe3S(CO)9 (3) wurden untersucht bezüglich des Metallaustauschs, der Nitrosierung und der Reaktionen der daraus zugänglichen Anionencluster mit verschiedenen Organo-Element-Halogeniden. Das Metallaustausch-Reagenz Fe(CO)42- führte zur Umwandlung von 1 in 2 und von FeCoMoSCp(CO)8 (4) in HFe2MoSCp(CO)8 (5). NiCp2 überführte 3 in HFe2NiSCp(CO)6 (6) und FeNi2SCp2-(CO)3 (7). Mit HNO2 war, wie aus 2 das bekannte Fe2CoS(CO)8NO (8), aus 3 HFe3S(CO)8NO (9) zugänglich. Eine Strukturanalyse von 8 belegte die echte Isosterie dieses Komplexes mit 1 und dem Dianion von 3 durch sehr geringe Einflüsse bei Variation der Metallatome, der Ladung und der Liganden. Durch Umsetzung von K2Fe3S(CO)9 mit Hauptgruppenelement-Halogeniden entstanden die doppelt-verbrückten Cluster Fe3(S,X)(CO)9 (10, X = μ2-SnMe2; 11, X = μ3-PPh, -PTo1, -AsMe, -S, -SO). Die Edelmetall-Reagenzien [R3P · MHal]n mit M = Cu, Ag, Au ermöglichten die Cluster-Expansion ausgehend von den Anionen der Hydridometallcluster, wobei schwefelverbrückte Vier- und Fünfkerncluster mit Fe3Cu-, Fe2CoAu-, Fe2NiAu- sowie Fe3Cu2-, Fe3Ag2- und Fe3Au2-Gerüsten gebildet wurden. Die Strukturanalyse von (Ph3PAu)2Fe3S(CO)9 (16) lieferte Indizien zum Mechanismus der Clusteraufbaureaktion.
    Additional Material: 2 Ill.
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  • 8
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 120 (1987), S. 1515-1521 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Anionic Fe3P Clusters: Preparation and Reactions Involving Framework ChangesThe derivative chemistry of the clusters H2Fe3(CO)9PR, HFe3-(CO)9PR-, and Fe3(CO)9PR2- with R = Me, t-Bu, Ph, Tol was investigated. It could be shown by the formation of the anions HFe3(CO)9PR- from Fe3(CO)112- and Cl2PR that the clusters are accessible without the inconvenience due to the odour of the reagents H2PR. As an intermediate of the new synthesis reaction the anion HFe2(CO)7-μ-PMe-Fe(CO)4- was obtained and characterized by a structure analysis of its PPN salt (5a). The high acidity of the clusters H2Fe3(CO)9PR resulted in their easy deprotonation. With main group element dihalogen compounds EHal2 (E = PPh, PTol, AsMe, SnMe2) and K2Fe3(CO)9PR (R = Ph, Tol) the doubly bridged clusters Fe3(CO)9(μ3-PR)(μ3-E) (E = PPh, PTol, AsMe) and Fe3(CO)9(μ3-PR)(μ2-SnMe2) were formed. With the noble metal reagents [R3P—MHal]n with M = Cu, Ag, Au cluster expansion was possible which starting from the anionic Fe3P clusters led to a series of new compounds with PFe3M and PFe3M2 frameworks.
    Notes: Es wurde die Derivatchemie der Cluster H2Fe3(CO)9PR, HFe3- und Fe3(CO)9PR2- Mit R = Me, t-Bu, Ph, Tol untersucht. Mit der Gewinnung der Anionen HFe3(CO)9PR- aus Fe3(CO)112- und Cl2PR konnte gezeigt werden, daß die Cluster auch ohne die Geruchsbelästigung durch die Reagenzien H2PR zugänglich sind. Als Zwischenstufe der neuen Synthesereaktion wurde das Anion HFe2(CO)7-μ-PMe-Fe(CO)4- erhalten und durch Strukturanalyse seines PPN-Salzes (5a) charakterisiert. Die hohe Acidität der Cluster H2Fe3(CO)9PR erlaubte ihre leichte Deprotonierung. Mit Hauptgruppenelement-Dihalogenverbindungen EHal2 (E = PPh, PTol, AsMe, SnMe2) wurden aus K2Fe3-(CO)9PR (R = Ph, Tol) die doppelt verbrückten Cluster Fe3(CO)9(μ3-PR)(μ3-E) (E = PPh, PTol, AsMe) und Fe3(CO)9(μ3-PR)(μ2-SnMe2) gebildet. Mit den Edelmetall-Reagenzien [R3P—MHal]n mit M = Cu, Ag, Au war Cluster-Expansion ausgehend von den anionischen Fe3P-Clustern möglich, die zu einer Reihe neuer Verbindungen mit PFe3M- und PFe3M2-Gerüsten führte.
    Additional Material: 1 Ill.
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  • 9
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 99 (1987), S. 350-352 
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Ill.
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  • 10
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 98 (1986), S. 558-559 
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Ill.
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