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  • 1
    Electronic Resource
    Electronic Resource
    Crystal structure and vibrational spectra of pyridine-2,6-dithio-carbomethylamide (1981)
    Springer
    Monatshefte für Chemie 112 (1981), S. 537-545 
    Details
    ISSN: 1434-4475
    Keywords: Crystal structure analysis ; Pyridine-2,6-dithiocarbomethylamide ; Vibrational spectra
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Die Kristallstruktur von Pyridin-2,6-dithiocarbomethylamid (PDTA) wurde bestimmt: C9H11N3S2, monoklin, P21/c,Z=4,a=6,000 (1) Å,b=8,840 (1) Å,c=21,452 (1) Å, β=105,47 (1)o,d x=1,47 gcm−3. Das Phasenproblem wurde mittels direkter Methoden gelöst und die Struktur bis zu einemR-Faktor vonR=0,047 verfeinert. Das Molekül ist im Kristall nahezu planar. Das Vorliegen schwacher intramolekularer Wasserstoffbrücken zwischen den beiden Thioamid-Stickstoffatomen und dem Pyridinstickstoff sowie intermolekularer Wasserstoffbrücken zwischen Thioamid-Stickstoff- und Thioamid-Schwefelatomen wird postuliert. IR- undRaman-Spektren vonPDTA und deuteriertemPDTA werden diskutiert.
    Notes: Abstract The crystal structure of Pyridine-2,6-dithio-carbomethylamide (PDTA) is described: C9H11N3S2, monoclinic, P21/c,Z=4,a=6.000 (1) Å,b=8.840 (1) Å,c=21.452 (1) Å, β=105.47 (1)o,d x=1.47 gcm−3. The structure was solved with direct methods and refined to a conventionalR-factor of 0.047. The molecule is nearly planar in the crystal. There are possibly weak intramolecular H-bonds between the two amide nitrogens and the pyridine nitrogen and intermolecular H-bonds between two amide nitrogens and one thioamide sulfur atom. The IR andRaman spectra ofPDTA and deuteratedPDTA are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00899668
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  • 2
    Electronic Resource
    Electronic Resource
    Crystal structure and spectra of the Ni(II) complex of pyridine-2,6-dithio-carbomethylamide (1981)
    Springer
    Monatshefte für Chemie 112 (1981), S. 721-730 
    Details
    ISSN: 1434-4475
    Keywords: Crystal structure analysis ; Electronic spectra ; Infrared spectra ; Magnetic susceptibility ; Pyridine-2,6-dithiocarbomethylamide nickel(II)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Die Kristallstruktur des paramagnetischen bis(Pyridin-2,6-dithiocarbomethylamid) Nickel(II)-nitrats (NiPDTA) wurde bestimmt. C18H22N6S4Ni·(NO3)2·(H2O)1,5, monoklin, C2/c,Z=4,a=14,705 (3) Å,b=23,254 (8) Å,c=8,383 (3) A, β=98,18 (2)°,d x=1,55gcm−3,d m=1,53gcm−3. Das Phasenproblem wurde mittelsPatterson-und Differenz-Fourier-Synthese bestimmt und die Struktur bis zu einem kristallographischenR-Faktor vonR=0.053 verfeinert. Das Nickel-Atom ist von vier Thioamid-Schwefelatomen und zwei Pyridin-Stickstoffatomen in quadratisch-bipyramidaler Anordnung umgeben. Schwingungsspektren und Anregungsspektren des Komplexes werden diskutiert.
    Notes: Abstract The crystal structure of the paramagnetic bis(pyridine-2,6-dithiocarbomethylamide) nickel(II) nitrate (NiPDTA) is described: C18H22N6S4·(NO3)2·(H2O)1,5, monoclinic, C2/c,Z=4,a=14.705 (3) Å,b=23.254 (8) Å,c=8.383 (3) A, β=98.18 (2)°,d x=1.55 gcm−3,d m=1.53 gcm−3. The structure was solved withPatterson and differenceFourier techniques and refined to a residual ofR=0.053. The nickel is surrounded by a square bipyramidal coordination of four thioamide sulfur atoms and two pyridine nitrogen atoms. Vibrational and electronic band positions for this compound are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00899775
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  • 3
    Electronic Resource
    Electronic Resource
    Zur Porenanalyse anPAN-Fasern durch Röntgenkleinwinkelanalyse und Tieftemperaturgassorptionsmessungen (1984)
    Springer
    Monatshefte für Chemie 115 (1984), S. 1269-1278 
    Details
    ISSN: 1434-4475
    Keywords: Pore analysis ; Small angle X-ray scattering ; Gas sorption ; Void system ; PAN-fibers
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Both inner surface and void system of technicalPAN-fibres (Wolpryla 65) have been determined by means of low temperature gas sorption, and by X-ray small angle analysis. We find similar trends for both methods, but different absolute values. These differences are explained by structural considerations. A model for the structure of the voids system is derived from the X-ray data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00798304
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  • 4
    Electronic Resource
    Electronic Resource
    Röntgenkleinwinkeluntersuchungen der strahleninduzierten Aggregation von Ribonuclease, Lactat-Dehydrogenase, Glycerinaldehyd-3-phosphat-Dehydrogenase und Serumalbumin. Ein Vergleich mit Malatsynthase (1980)
    Springer
    Monatshefte für Chemie 111 (1980), S. 981-1004 
    Details
    ISSN: 1434-4475
    Keywords: Glyceraldehyde-3-phosphate dehydrogenase ; Lactate dehydrogenase ; Radiation damage ; Ribonuclease ; Serum albumin ; Small-angle X-ray scattering
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Abstract Measurements carried out withLDH andGAPDH in the presence of 2mM DTT established a strong protective effect ofDTT against the X-ray induced aggregation of these enzymes. The initial increase of $$\tilde R$$ upon irradiation ofLDH andGAPDH in the presence of 2mM DTT was found to be even lower than the increase of $$\tilde R$$ observed when serum albumin was irradiated in the absence ofDTT. However, the observed decrease of $$\bar x$$ ofLDH andGAPDH at the early stages of irradiation suggested the occurrence of fragmentation of the enzymes as another consequence of radiation damage. This finding is discussed in context with the results from previous scattering experiments and electrophoretic studies on malate synthase.
    Notes: Abstract The X-ray induced aggregation of ribonuclease, lactate dehydrogenase (LDH), glyceraldehyde-3-phosphate dehydrogenase (GAPDH) and serum albumin in aqueous solution was monitored in situ by means of small-angle X-ray scattering. The time dependence of several molecular parameters viz. the apparent radius of gyration $$\tilde R$$ , the maximum visible diameterD, the mean degree of aggregation $$\bar x$$ , and the mean radius of gyration $$\bar R$$ was used to compare the various proteins with each other and with malate synthase which has been studied previously (P. Zipper andH. Durchschlag, Radiat. and Environm. Biophys., 1980). Measurements carried out with ribonuclease,LDH and serum albumin in the absence of dithiothreitol (DTT) and withGAPDH in the presence of 0.2mM DTT established the following series for the rates of aggregation of the proteins under these conditions: ribonuclease〉LDH〉GAPDH〉serum albumin. The rate of aggregation ofGAPDH was found to be of similar magnitude as that obtained for malate synthase under comparable experimental conditions (presence of 0.2mM DTT, similar X-ray intensity) in our previous study. Within six hours from the beginning of irradiation (i.e. about the time required for the exposure of one complete scattering curve under the conditions of our experiments) the following increases of $$\tilde R$$ resulted: ribonuclease 9%,LDH 7%,GAPDH 4%, serum albumin〈1%. Changes of $$\tilde R$$ exceeding 1% are, of course, too high to be tolerated in conventional scattering experiments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00899265
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  • 5
    Electronic Resource
    Electronic Resource
    Konzentrations- und Temperaturabhängigkeit der Viskosität von Polyacrylnitril-Lösungen in Dimethylformamid (1980)
    Springer
    Monatshefte für Chemie 111 (1980), S. 1053-1060 
    Details
    ISSN: 1434-4475
    Keywords: Concentration dependence of viscosity ; Polyacrylonitrile solutions ; Temperature dependence of viscosity ; Viscosity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Viscosity measurements were carried out with polyacrylonitrile dissolved in dimethylformamide up to 0.36 g/ml. The temperature range was 20°C to 130°C, the highest shear gradient applied, 5.6·103s−1. The temperature variation of viscosity is reproduced with sufficient accuracy by the equation ν=k·exp (Q/RT). Bothk andQ increase as concentration increases, and the viscosity increases withc 1.12 toc 6.4 Inverse proportionality appears to exist between concentration and the longest relaxation time.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00909661
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  • 6
    Electronic Resource
    Electronic Resource
    Das rheologische Verhalten der gebogenen α-Helix (1981)
    Springer
    Monatshefte für Chemie 112 (1981), S. 1055-1062 
    Details
    ISSN: 1434-4475
    Keywords: α-Helix ; Polybenzyl-L-glutamate ; Rheological properties
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Intrinsic viscosity and its shear dependence of polybenzyl-L-glutamat inm-cresol suggest a slightly bent α-helix. Axis ratio and rotational diffusion constant of the envelopping cylinder are determined and the length of the helix calculated, which leads to the correct molecular weight. The amount of solvated and hydrodynamically immobilized water is estimated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00905073
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  • 7
    Electronic Resource
    Electronic Resource
    Light-scattering investigations on LDL-heparin complexes (1982)
    Springer
    Bioscience reports 2 (1982), S. 413-417 
    Details
    ISSN: 1573-4935
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01119304
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  • 8
    Electronic Resource
    Electronic Resource
    Flow of TiO2-pigment dispersions in water (1984)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 122 (1984), S. 219-224 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: TiO2-Dispersionen in Wasser mit und ohne Dispergiermittel werden im Konzentrationsbereich 30-70 Gew.-% und im Scherbereich 1-106 s-1 im Hochdruck-Kapillarviskosimeter untersucht. Die Daten der Fließkurven werden nach Mooney aufgetragen und daraus die Immobilisierungskonzentration und die Volumen-Grenzviskositätszahl ermittelt. Beide Größen werden mit der Flockengröße des dispergierten Pigments in Zusammenhang gebracht. Die nach Perrin ermittelten absoluten Teilchengrößen stimmen mit Daten aus der Zentrifugenanalyse überein.
    Notes: TiO2-dispersions in water with and without dispersing agent are studied in the high pressure capillary viscometer in the concentration range of 30-70 weight percent and in the shear range of 1-106 s-1. The data of the flow curves are plotted according to Mooney and both the immobilization concentration and the volume limiting viscosity number are calculated. Both figures are correlated with the flock size of the dispersed pigment. Absolute particle size, calculated according to Perrin, agrees with data from centrifuge analysis.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1984.051220122
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