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  • 1
    Electronic Resource
    Electronic Resource
    Laser speckle movements related to platinum-electrolyte interface (1978)
    Springer
    Applied physics 15 (1978), S. 303-306 
    Details
    ISSN: 1432-0630
    Keywords: 73 ; 42.30
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Speckle movements are discovered in the investigation of a platinum-hydrogen system in 1N HClO4. The speckle pattern of the light scattered off by a platinum-electrode surface is displaced laterally as a whole as a function of the electrode potential. The derivative of the photocurrent profile corresponding to the speckle displacement has four peaks in the so-called hydrogen region of the electrode potential. Three of these peaks have a certain correlation with the electrochemical aging effect which is attributed to hydrogen adsorbed on to the electrode surface. The feasibility of using this effect for in situ investigations of the metal-solution interface is pointed out.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00896112
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  • 2
    Electronic Resource
    Electronic Resource
    Formaldehyde polymers, 30Part 29: cf.1.. Preparation of 5-hydroxy-4-chromanones and 8-hydroxy-1-tetralon and their properties as UV-absorbers (1982)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 183 (1982), S. 1969-1977 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: 5-Hydroxy-6,8-dimethyl-4-chromanone (4a) and 8-hydroxy-5,7-dimethyl-1-tetralon (4b) were synthesized from 6,8-dimethyl-4 chromanone (1a) and 5,7-dimethyl-1-tetralon (1b), respectively. 5-Hydroxy-7-methody-2,2-dimethyl-4-chromanone (6) was prepared from 5,7-dihydroxy-2,2-dimethyl-4-chromanone (5). Cyclohexane solutions of 1a, 1b, 4a, 4b, 6, 5-hydroxymethyl-6,8-dimethyl-4-chromanone (7), 3-hydroxy-2,6-dimethyl-4-chromanone (8), and 2-hydroxy-4-octyloxybenzonphenone (9) were irradiated. The photostability of these compounds was found to decrease in the following order: 4b 〉 4a, 6 〉 9 〉 1a, 1b. 7, 8. Poly(venyl chloride) films containing 5, 0 wt.-% of 4a, 4b, or 6 were found to be stable against photooxidation.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1982.021830816
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Structural characterization of modified nucleosides in tRNA hydrolysates by frit-fast atom bombardment liquid chromatography/mass spectrometryPreliminary results were presented at the Kyoto '92 International Conference on Biological Mass Spectrometry, 20-24 September 1992, Kyoto, Japan. (1994)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 23 (1994), S. 465-474 
    Details
    ISSN: 1052-9306
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Feasibility for the structural characterization of modified nucleosides in transfer RNA at low microgram levels has been investigated by using continuous-flow frit-fast atom bombardment liquid chromatography/mass spectrometry (frit-FAB LC/MS). Sample of tRNAPhe from brewer's yeast (Saccharomyces cerevisiae) was used as a main model, and enzymatically hydrolysed by nuclease P1 and alkaline phosphatase. The resulting nucleoside mixture was separated by using a microbore reversed-phase LC column (150 mm × 0.5 mm i.d.) with an aqueous ammonium acetate-methanol gradient, and the mass spectra were acquired on both positive and negative ionization modes. The modified nucleosides were characterized by comparison of the relative LC elution times with authentic nucleosides, and further confirmed by the structural information from the frit-FAB mass spectra where both molecular and base ions were in general observed as intense peaks in both ionization modes. Tyically, 0.06-0.2 A260 units (3-10 μg) of isoaccepting tRNA was enough to obtain full-scan mass spectra of modified nucleosides, often occurring at a frequency of one per tRNA molecule using positive ion detection. The LC/MS system was used to screen modified nucleosides in tRNA of the extremely thermophilic microorganism Pyrodictium occultum.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bms.1200230803
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    Paper (German National Licenses)
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