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  • Physical Chemistry  (2)
  • Accurate mass  (1)
  • Adenocarcinoma  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Metastatic colon carcinoma simulating primary bile duct carcinoma via endoscopic cholangiography (1977)
    Springer
    Abdominal imaging 2 (1977), S. 75-76 
    Details
    ISSN: 1432-0509
    Keywords: Bile duct carcinoma ; Colon carcinoma ; Endoscopic retrograde cholangiopancreatography ; Adenocarcinoma
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract A case of metastatic colon carcinoma simulating primary bile duct carcinoma is presented. The radiographic similarities via endoscopic retrograde cholangiopancreatography include bile duct narrowing and mucosal destruction. A distinguishing feature, however, is failure of the intrahepatic bile ducts to dilate in metastatic carcinoma to the biliary tree.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02256470
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Accurate Mass Measurements Using MALDI-TOF with Delayed Extraction (1997)
    Springer
    The protein journal 16 (1997), S. 363-369 
    Details
    ISSN: 1573-4943
    Keywords: Accurate mass ; MALDI-TOF ; delayed extraction ; mass spectrometry ; peptide
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Matrix-assisted laser desorption ionization time-of-flight (MALDI-TOF) mass spectrometry is now an essential tool in biopolymer analysis. Sensitivity and mass range are unsurpassed, but mass measurement accuracy and resolution have been limited. With delayed extraction and a reflecting analyzer, mass measurements using MALDI-TOF can be made with an accuracy of a few parts per million (ppm). It is possible to distinguish Lys from Gln in peptides, and to determine the elemental composition of smaller molecules (mass 100–500). In database searching strategies, a smaller mass window, resulting from an increase in mass accuracy, greatly decreases the number of possible candidates. Mass measurement accuracy with errors less than 5 ppm is demonstrated on a mixture of 12 peptides ranging in mass from ca. 900 to 3700 Da. Mass measurements on 13 peaks in an unseparated tryptic digest of myoglobin gave results with an overall average error less than 3.5 ppm, with a maximum error of 7 ppm.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1026376403468
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    The methyl radical combination rate constant as determined by kinetic spectroscopy (1973)
    New York, NY : Wiley-Blackwell
    International Journal of Chemical Kinetics 5 (1973), S. 1053-1065 
    Details
    ISSN: 0538-8066
    Keywords: Chemistry ; Physical Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The rate constant for the reaction \documentclass{article}\pagestyle{empty}\begin{document}$$ {\rm CH}_{\rm 3} + {\rm CH}_{\rm 3} + {\rm M}\mathop {\longrightarrow}\limits^{k_1 } {\rm C}_{\rm 2} {\rm H}_{\rm 6} + {\rm M} \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\left( {{\rm M = He}} \right) $$\end{document} has been determined by means of vacuum ultraviolet flash photolysis and time-resolved kinetic spectroscopic observations of the 1504-Å absorption band of CH3. The measurements made using three different sources of methyl radicals (azomethane, dimethylmercury, and ketene-hydrogen) were in accord and yielded a value for the rate constant of k1 = (9.53 ± 1.17) × 10-11 cc molec-1 sec-1. A detailed error analysis is presented. The f-value for the 1504-Å band of CH3 is determined to be (2.5 ± 0.7) × 10-2.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/kin.550050614
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  • 4
    Electronic Resource
    Electronic Resource
    Rate constants of the combination of methyl radicals with nitric oxide and oxygen (1975)
    New York, NY : Wiley-Blackwell
    International Journal of Chemical Kinetics 7 (1975), S. 639-648 
    Details
    ISSN: 0538-8066
    Keywords: Chemistry ; Physical Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Rate constants for the combination of methyl radicals with NO and O2 have been measured by flash photolysis of azomethane coupled with product analysis by gas chromatography. Values of the rate constants have been obtained over the pressure region from 50 to 700 torr with He, N2, and Ar as quenching molecules.The high-pressure limits were obtained through an RRKM model calculation and were found to be \documentclass{article}\pagestyle{empty}\begin{document}$$ \begin{array}{*{20}c} {{\rm CH}_{\rm 3} + {\rm NO} + {\rm M} \to {\rm CH}_{\rm 3} {\rm NO} + {\rm M}} \hfill & {k_\infty = 3.2 \times 10^{ - 11} {{{\rm cm}^{\rm 3} } \mathord{\left/ {\vphantom {{{\rm cm}^{\rm 3} } {{\rm molec} \cdot {\rm sec}}}} \right. \kern-\nulldelimiterspace} {{\rm molec} \cdot {\rm sec}}}} \hfill \\ {{\rm CH}_{\rm 3} + {\rm O}_{\rm 2} + {\rm M} \to {\rm CH}_{\rm 3} {\rm O}_{\rm 2} + {\rm M}} \hfill & {k_\infty = 1.7 \times 10^{ - 12} {{{\rm cm}^{\rm 3} } \mathord{\left/ {\vphantom {{{\rm cm}^{\rm 3} } {{\rm molec} \cdot {\rm sec}}}} \right. \kern-\nulldelimiterspace} {{\rm molec} \cdot {\rm sec}}}} \hfill \\ \end{array} $$\end{document} The rate constants were measured relative to the methyl combination reaction k1 with k1 = 9.5 × 10-11 cm3/molec · sec. The RRKM model suggests D0(CH3—O2) = 32 ± 3 kcal/mole.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/kin.550070502
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    Paper (German National Licenses)
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