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  • 1975-1979  (9)
  • Chemistry  (8)
  • 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
    Massenspektren alicyclischer Verbindungen. VI. Massenspektrometrisches Fragmentierungsverhalten von Chloressigsäurediestern des trans-1,4-Cyclohexandiols (1979)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 321 (1979), S. 953-958 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Mass Spectra of Alicyclic Compounds. VI. Mass Spectrometric Fragmentation of Chloroacetic Esters of the trans-1,4-CyclohexanediolThe electron impact mass spectra of some chloroacetic esters of trans-1,4-cyclo-hexanediol and of cyclohexanol are discussed.It was found that the fragmentation process in these compounds is determined by the number of chlorine atoms in the acid and the interactions between the two functional groups.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19793210610
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    The β association of (DLLys)10-(LVal)20-(DLLys)10: An nmr study (1976)
    New York : Wiley-Blackwell
    Biopolymers 15 (1976), S. 1377-1395 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: (DLLys)10-(LVal)20-(DLLys)10, a copolymer of a valine block in the β conformation with randomly coiled flanking blocks of lysine [Kubota, S. & Fasman, G. D. (1975) Biopolymers 14, 605-631], was studied by nuclear magnetic resonance. The peak areas of the N—H and C—H resonances of valine and lysine are concentration-dependent with little chemical shift change. A model is presented describing the aggregation of the copolymer. Additional evidence, obtained by monitoring the spin-lattice relaxation times of amino, amide, γ-methyl-valine, and ∊-methylene-lysine, is consistent with the aggregation model. Hydrodynamic studies are presented which show monomer → oligomer aggregation of four or five subunits.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.1976.360150711
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Thermal denaturation of chromatin and lysine copolymer-DNA complexes. Effects of ethylene glycol (1979)
    New York : Wiley-Blackwell
    Biopolymers 18 (1979), S. 1045-1063 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Chromatin was thermally denatured in the presence and absence of 1M ethylene glycol using a technique whereby both the hyperchromism and ellipticity are monitored simultaneously. Model complexes containing poly(L-Lys) or poly(L-Lys, L-Ala, Gly) and DNA were similarly melted in order to assist in interpreting the chromatin results. In both cases a general pattern emerged whereby ethylene glycol perturbed the resultant melting profile, showing increased hyperchromicity, ellipticity, and premelt slope. In addition, ethylene glycol destabilizes and reduces the high melting region of polypeptide-bound DNA and the extent of higher ordered structure in model complexes and chromatin. These results emphasize the importance of hydrophobic forces in polypeptide-polypeptide and polypeptide-DNA interactions.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.1979.360180503
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Mass Spectrometric Decomposition Processes in Labelled 1-Heptenes (1976)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 59 (1976), S. 987-998 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The 70 eV mass spectra of a number of 13C- and D-labelled analogs of 1-heptene have been measured, as well as the metastable transitions in the non-labelled compound. Isotopic distributions in the major fragment ions have been calculated from the high and low resolution data. The results show that considerable skeletal rearrangement must take place before formation of most of the fragment ions. Loss of methyl and ethyl radicals occurs mainly from the two ends of the molecule. Ethylene fragments come primarily from the unsaturated end of the molecule, but show evidence of significant prior skeletal rearrangement. The predicted McLafferty rearrangement accounts for only 2/3 of the C4H8+ ions formed, less for the C3H6+ ions. At least 80% of C4H9+ ions appear to be formed by allylic cleavage, as expected, but this mechanism can only account for a maximum of 20% of the formation of the complementary ion C3H5+. Both, this latter ion and C3H6+, are probably generated by loss of hydrogen from C3H7+.Figures obtained for label retention in 1-[13C]- and 1-D-labelled analogs were nearly identical for most fragment ions, probably indicating that the hydrogen atoms in position 1 remain on C(1) even following skeletal rearrangement. A similar result was found for the 7-[13C]- and 7-D-labelled compounds. The main exceptions in the case of the products labelled in position 1 (C4H7+, C3H3+) seem to be due to initial loss of an hydrogen atom from this position followed by further fragmentation.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19760590403
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Die Startgeschwindigkeit des Systems Styrol/Maleinsäureanhydrid (1979)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 30 (1979), S. 711-716 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: The initiation rate of the system styrene-maleic acid anhydride was determined by using a labelled initiator (tracer method) in acetonitrile, acetone and tetrahydrofurane as solvents at different molar ratios of the monomers and constant overall monomer concentration. The initiation rate was found to depend distinctly on the composition of the monomer mixture. The kinetic chain length and the ratio of the rate constants kw/ka1/2 are discussed.
    Notes: Die Startgeschwindigkeit des Systems Styrol/Maleinsäureanhydrid wurde unter Benutzung eines radioaktiv markierten Initiators (Tracer-Methode) in den Lösungsmitteln Acetonitril, Aceton, Tetrahydrofuran bei unterschiedlicher molarer Zusammensetzung der Monomermischung unter Konstanthalten der Gesamtmonomerkonzentration gemessen. Es zeigte sich eine deutliche Abhängigkeit der Startgeschwindigkeit von der Zusammensetzung der Monomermischung. Die kinetische Kettenlänge sowie das Konstantenverhältnis kw/ka1/2 werden diskutiert.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1979.010301110
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  • 7
    Electronic Resource
    Electronic Resource
    Das Banifield-Radikal als Inhibitor für die Polymerisationsreaktion von Styrol/Maleinsäureanhydrid (1979)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 30 (1979), S. 643-647 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: The Banfield radical was used successfully for the determination of the inition rate of the homopolymerization of maleinimides. In the copolymerization of styrene with maleic acid anhydride some additional effects are observed which suggest this inhibitor not to be the most convenient for this system. Particularly, no proportional dependence of the inhibition time on the inhibitor concentration was observed. After inhibition the polymerization rate was distinctly retarded. A possible reaction scheme is discussed.
    Notes: Das Banfield-Radikal kann mit Erfolg für die Bestimmung der Startgeschwindigkeit der Homopolymerisation von Maleinimiden eingesetzt werden. Bei der Copolymerisation von Styrol/Maleinsäureanhydrid ergeben sich einige zusätzliche Effekte, die diesen Inhibitor nicht als ideal für unser System erscheinen lassen. Es wurde vor allem keine Proportionalität zwischen der Inhibitionszeit τ und der Inhibitorkonzentration erhalten. Die Polymerisationsgeschwindigkeit nach Ablauf der Inhibitionsphase wurde deutlich retardiert. Es wird dafür ein mögliches Reaktionsschema diskutiert.
    Additional Material: 8 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1979.010301010
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  • 8
    Electronic Resource
    Electronic Resource
    Competing metastable decompositions of [C7H14]+· ions (1976)
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 11 (1976), S. 409-414 
    Details
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The relative rates of competing metastable decompositions of fourteen isomeric C7H14 monoolefins were measured and compared. In every case except one the most important metastable reaction was loss of either CH3 or C2H4, but the rates of these and the other reactions observed varied over a wide range. It was concluded that the molecular ions of these compounds probably do not isomerize to a common structure prior to metastable decay. It was found that a terminal double bond strongly enhances metastable loss of C2H4 and that the additional presence of a 2-methyl substituent favours this reaction still more. Several possible mechanisms for this transition are discussed, but none was found to explain the observed results satisfactorily.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/oms.1210110413
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  • 9
    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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