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  • 1
    Electronic Resource
    Electronic Resource
    Ultrahigh vacuum sample mount for insulators (1986)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 57 (1986), S. 3134-3135 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: An ultrahigh vacuum sample mount for insulators which allows both good thermal conduction to the mount and accurate temperature measurement is described: good thermal connection between sample and mount is made with an indium layer. By melting an edge of the sample a thermocouple can be inserted directly into the crystal for accurate temperature measurement.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1138956
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  • 2
    Electronic Resource
    Electronic Resource
    Pharmacological differences between R(−)-and S(+)-ibuprofen (1989)
    Springer
    Inflammation research 27 (1989), S. 455-457 
    Details
    ISSN: 1420-908X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Ibuprofen (IBU) is a non-steroidal anti-inflammatory drug exhibiting optical isomerism. Only the racemate is in clincal use. Inin vitro studies it has been demonstrated that only the S(+)-enantiomer inhibits the PG synthetase system. Nevertheless, it is widely believed that the sole use of the active isomer does not comprise any advantages since the inactive isomer is converted within the human body. In a triple cross-over study (300 mg S(+), 300 mg R(−), 600 mg racemic IBU;n=8), we could show that the converted R(−)-IBU after racemate administration provides for only one third of the AUC of S(+)-IBU obtained after S(+)-application. Highest S(+)-peak plasma levels were reached after S(+)-IBU, lower ones after racemate. We, therefore, studied 4 patients with classical rheumatoid arthritis treated with 2–3 doses of 500 mg of S(+)-IBU/day over a two week period. Significant clinical recovery (Ritchie-indexp〈0.01; analogue scale painp〈0.05, motionp〈0.01) was reached after one week. The results indicate that a reduction of dose and of metabolic load is possible if the S(+)-enantiomer is administrated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01972851
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  • 3
    Electronic Resource
    Electronic Resource
    Hunter syndrome among Ashkenazi Jews in Israel; evidence for prenatal selection favoring the Hunter allele (1985)
    Springer
    Human genetics 〈Berlin〉 71 (1985), S. 329-332 
    Details
    ISSN: 1432-1203
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Analysis of Ashkenazi families with Hunter patients in Israel demonstrated the complete absence of new mutations among the probands' mothers. Furthermore, in these families a significant deviation of the segregation ratio between the Hunter gene and the normal allele was demonstrated among offspring of heterozygous mothers or siblings of affected children. This may be due to pre- or postzygotic prenatal selection, favoring the X chromosome carrying the Hunter gene among Ashkenazi Jews.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00388459
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  • 4
    Electronic Resource
    Electronic Resource
    Phospholipids accumulation in mucolipidosis IV cultured fibroblasts (1988)
    Springer
    Journal of inherited metabolic disease 11 (1988), S. 144-150 
    Details
    ISSN: 1573-2665
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Cultured fibroblasts from mucolipidosis IV patients accumulated phospholipids when compared to normal controls or cells from other genotypes. The major stored compounds were identified as phosphatidylcholine, phosphatidylethanolamine and to a larger extent lysophosphatidylcholine and lysobisphosphatidic acid. Pulse chase experiments of32P-labelled phospholipids showed increased retention of these compounds in the mucolipidosis IV lines throughout the pulse and chase periods. Phospholipase A1, A2, C, D and lysophospholipase showed normal activity in the mucolipidosis IV lines and thus the metabolic cause for this storage remains to be identified.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01799863
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  • 5
    Electronic Resource
    Electronic Resource
    Untersuchungen zur Thermischen Umsetzung von Phenylcyclopentan, -hexan, -heptan und -octan in der Gasphase Teil der Dissertation A von Herrn Ho Són Lam, Akademie der Wissenschaften der DDR, Berlin-Leipzig 1983. (1985)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 327 (1985), S. 759-766 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Studies on Thermal Conversion of Phenyleyclopentane, -hexane, -heptane, and -octane in the Gas PhaseThe title compounds were pyrolyzed from 700 to 780°C in a metallic laboratory tubular reactor in the presence of steam. The reaction products were analyzed by gas chromatography and by a combination of gas chromatography and mass spectrometry. From the phenylcyclanes tested, more than 65 hydrocarbons could be detected in the liquids, besides gaseous reaction products. In most cases unambiguous structures could be derived by using different analytical methods.As typical initial-step products phenylcyclenes, ω-phenyl-1-alkenes and 1-phenyl-1-alkenes are formed by dehydrogenation and isomerization of the title compounds. The detection of phenylalkenes corresponds well with the isomerization of unsubstituted cyclanes to the corresponding α-olefines described in former papers.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19853270508
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  • 6
    Electronic Resource
    Electronic Resource
    Zur Pyrolyse unsubstituierter Cyclane - Produktbildungsselektivitäten, kinetische Parameter, mechanistische InterpretationenProfessor Dr.-Ing. Dr.h.c. Eberhard Leibnitz zum 75. Geburtstage gewidmet (1985)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 327 (1985), S. 10-20 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: On the Pyrolysis of Unsubstituted Cyclanes - Selectivity of the Formation of Reaction Products, Kinetic Parameters, Mechanistic InterpretationsThe thermal decompostion of cyclopentane (1), cyclohexane (2), cycloheptane (3), cyclooctane (4), cyclodecane (5), and cyclododecane (6) was studied in a laboratoryscale metallic tubular reactor at 650 to 850°C in the presence of steam. The kinetic parameters for the overall reactions were determined and the gaseous as well as the liquid reaction products were analyzed and identified by gas chromatography or by the coupling of gas chromatography and mass spectrometry, respectively. It could be shown that from all cyclanes the isomeric α-olefines are formed, if the conversion of the starting cyclanes is small. This supports the view that the cyclane → α-olefin isomerization is an important initial reaction in pyrolysis of 1 up to 6. The results also demonstrate that the main pathway of degradation is a radical chain mechanism via cyclanyl radicals with β(C—C) bond scission and 1.4 or 1.5-H-isomerization of alkenyl radicals as the most important reaction steps.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19853270104
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  • 7
    Electronic Resource
    Electronic Resource
    FAB-Massenspektren von disulfonierten Cyaninfarbstoffen (1989)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 331 (1989), S. 859-862 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Fast Atom Bombardment Mass Spectra of Disulphonated Cyanine Dyestuffs
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19893310521
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  • 8
    Electronic Resource
    Electronic Resource
    Zur Gasphasenpyrolyse von α, ω-Phenylalkenen - Gesetzmäßigkeiten und BesonderheitenHerrn Professor Dr. Siegfried Nowak zum 60. Geburtstag gewidmet (1989)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 331 (1989), S. 977-988 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: On the Gas Phase Pyrolysis of α, ω-Phenylalkenes  -  Regularities and Special FeaturesThe thermal conversion of the α, ω-phenyl alkenes 1 to 4 was studied in the presence of a molar excess of Ar or steam at 500 to 875°C in a labscale tubular reactor. Detailed GC analyses did not establish significant evidences for such molecular rearrangements like, e.g., Di-π-methane rearrangement of 2, Ene and Carbo-Claisen reaction of 3. The decomposition obviously occurs via radical chain processes in the main. Besides them, however, radical cyclizations, Neophyl rearrangements and Retro-Ene reactions are parts of the complex reaction.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19893310612
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  • 9
    Electronic Resource
    Electronic Resource
    Zur Pyrolyse von 3-Ethylpent-2-en - Ein weiterer Hinweis auf eine Homoallyl-UmlagerungHerrn Professor Dr. W. Pritzkow zum 60. Geburtstag gewidmet (1988)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 330 (1988), S. 677-682 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Pyrolysis of 3-Ethylpent-2-ene  -  a Further Evidence for a Homoallylic-RearrangementThe pyrolysis of 3-ethylpent-2-ene has been studied under conditions of steam cracking in the temperature range 600 - 700°C in a laboratory scale tubular reactor. The main products of decomposition were methane, 2-ethylbutadiene and isoprene. The majority of products obviously arose from H abstraction and radical addition, typical for radical chain reactions in olefins decomposition including phenomena resulting from allylic resonance. The formation of isoprene, however, could only be explained by a reaction network including a homoallylic rearrangement.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19883300502
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  • 10
    Electronic Resource
    Electronic Resource
    Über die Thermische Umsetzung von Mono-n-alkylbenzenen (1987)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 329 (1987), S. 824-832 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Thermal Reaction of Mono-n-alkyl-benzenesThe pyrolysis of ethyl-(1), n-propyl-(2), n-hexyl-(3) and n-octylbenzene (4) has been studied under conditions of steam cracking (600 to 800°C) in a laboratory scale tubular reactor. The overall activation energies determined for (1) to (4) were found to be nearly identical (221 to 227 kJ · mol-1) obviously caused by similar initial steps. The main liquid product observed was styren accompanied by ω-phenyl-1-alkenes and α-olefins. Benzene is an important side product of 1. It might be formed mainly by a hydrogen assisted dealkylation via a cyclohexadienyl type radical as reactive intermediate.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19873290511
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