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  • 1
    Electronic Resource
    Electronic Resource
    Chichester [u.a.] : Wiley-Blackwell
    Surface and Interface Analysis 25 (1997), S. 614-619 
    ISSN: 0142-2421
    Keywords: nucleic acids ; adlayer domain organization ; scanning force microscopy (SFM) ; tip, substrate and imaging procedure variation ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: Both DNA and RNA domains and microdomains - to a certain degree comparable to self-organizational mesophase areas - have been visualized as graphite surface adlayers by scanning force microscopy in contact force mode. More polar substrate surfaces, sharper tip geometries and tapping mode procedures proved less favourable, due to sample distortions and prevention of organization within the adlayer by dominant adhesive forces in the interface.© 1997 John Wiley & Sons, Ltd.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 3 (1970), S. 777-788 
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A series of steroidal model compounds specifically designed to allow maximal as well as minimal charge localization at certain functional groups was subjected to mass spectrometric analysis. The results indicate that electron deficiency at the potentially reactive site is a prequisite for any fragmentation reaction to occur to an appreciable extent. The amount of charge density required at such a site seems to vary substantially for different types of fragmentation processes.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 16 (1981), S. 118-122 
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The mass spectra of the nicotinates of two methyl branched and one unsaturated long chain alcohol were compared with the mass spectra of the underivatized alcohols and of their trimethylsilyl ethers. It is shown that the structure of the chain is much more clearly shown by the spectra of the nicotinates than in the other spectra.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 21 (1986), S. 85-89 
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The electron impact mass spectra of the pyrrolidides of both the cis- and trans-octylcyclohexanecarboxylic acids show the structure of the aliphatic chain, despite the steric hindrance of a direct H transfer from the chain to the functional group.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 20 (1985), S. 266-267 
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 30 (1995), S. 1562-1566 
    ISSN: 1076-5174
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: A simple and rapid method for counting the number of internal disulfide bridges in a protein by incubation with 2-mercaptoethanol and electrospray mass spectrometry analysis of the products was developed. 2-Mercaptoethanol yields intermediate mixed disulfides during reduction of a protein. This results in a molecular weight increase of the protein by 78 Da per disulfide bond, which can easily be determined by electrospray mass spectrometry (ESMS). The number of mercaptoethanol adducts observed by ESMS reveals the number of disulfide bridges in the peptide or protein. Since the protein-mercaptoethanol-disulfide bonds are themselves further reduced by excess mercaptoethanol, the course of the reaction has to be followed in order to detect the maximum number of intermediates. Owing to the volatility of mercaptoethanol, samples can be taken out of the reaction solution for MS analysis without prior purification. Successful experiments were carried out using proteins with one, two, four or six S—S-bonds, covering a mass range from about 1 to over 23 kDa.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 314 (1962), S. 226-237 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Raman- and Infrared-Spectra of B2(OCH3)4 and B2[N(CH3)2]4 in the liquid state have been examined. An assignment of frequencies was made by the aid of selection rules, calculation of frequencies and spectra of related compounds. It is concluded, that B2(OCH3)4 has a planar arrangement of the sceletal atoms, with the point-group C2h. The force-constant kBO is somewhat higher than in the compound B(OCH3)3. In B2[N(CH3)2]4, the NC2. and the BN2-groups are twisted against the molecular plane.
    Notes: Es wurden die Raman- und Infrarotspektren der Verbindungen B2(OCH3)4 und B2[N(CH3)2]4 an den flüssigen Phasen gemessen. Die Zuordnung der Spektren, die sich auf Auswahlregeln, Modellberechnungen und Vergleichsspektren stützt, ermöglicht für B2(OCH3)4 den Schluß auf eine ebene Anordnung aller Gerüstatome entsprechend einer Punktgruppe C2h. Die Kraftkonstante KBO ist etwas größer als im B(OCH3)3. Für B2[N(CH3)2]4 muß eine Struktur angenommen werden, bei der die einzelnen NC2-Gruppen und die BN2-Gruppen jeweils gegeneinander verdrillt sind.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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