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  • Springer  (21)
  • Institute of Physics  (3)
  • 1985-1989  (24)
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  • 1
    Electronic Resource
    Electronic Resource
    Strukturelle Abwandlungen an N-Acetylneuraminsäuren, 8 Synthese von 7-, 8-, 9-Desoxy- und 4,7-Didesoxyneuraminsäure (1988)
    Springer
    Monatshefte für Chemie 119 (1988), S. 127-141 
    Details
    ISSN: 1434-4475
    Keywords: Deoxygenation of sialic acids ; Xanthogenates of sialic acids ; Reaction of side chain deoxy-iodo sialic acids with tributyltinhydride ; Reaction of xanthogenates of sialic acids derivatives with tributyltinhydride
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The 7- and 8-Iodnonulosonic acid derivatives1 and2 react with tributyltinhydride-AIBN to the 7- and 8-deoxy-N-acetylneuraminic acid derivatives3 a and4 a which after hydrolysis give the 7-deoxy-N-acetylneuraminic acid3 b (5-N-acetamido-3,5,7-trideoxy-β-D-galacto-2-nonulopyranosidonic acid=7-Deoxy-Neu5Ac) and 8-deoxy-N-acetylneuraminic acid4 b (5-N-acetamido-3,5,8-trideoxy-β-D-galacto-2-nonulopyranosidonic acid=8-Deoxy-Neu5Ac). The 4,8,9-tris-(t-butyldimethylsilyl)-N-acetylneuraminic acid derivative5 a yields after transformation to the 7-O-acetyl compound5 b and partial removing of the protecting groups the derivative5 c. Further reaction with theMitsunobu-reagent and methyliodide affords the 9-Iodocompound6 a which turned to the 8-O-acetylderivative6 b. Subsequent reduction by means of tributyltinhydride yields first the 9-deoxyderivative7 a and after hydrolysis the 9-deoxy-N-acetylneuraminic acid7 b (5-N-acetyl amido-3,5,9-trideoxy-D-glycero-β-d-galacto-2-nonulopy-ranosidonic acid=9-Deoxy-Neu5Ac). Another synthesis of7 b follows the route8 f →8 g →7 c. The Deoxy-N-acetylneuraminic acid3 b could be prepared also by an alternative procedure using the methyl-β-8,9-methylethylen-4-O-t-butyldimethylsilyl-N-acetylneuraminic acid methylester8 a via the intermediate compounds8 d and8 e. Application of the 8,9-O-methylethyliden-N-acetylneuraminic acid derivative8 opens an approach to the xanthogenates8 a and8 b which could be reduced to the deoxy-N-acetylneuraminic acid derivatives9 a and10 a. Hydrolysis of10 a yields the 4,7-dideoxy-N-acetylneuraminic acid10 b (5-N-acetamido-3,4,5,7-tetradeoxy-β-D-lyxo-2-nonulopyranosidonic acid=4,7-Dideoxy-Neu5Ac).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00810094
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  • 2
    Electronic Resource
    Electronic Resource
    Inhibition of hepatic epoxide hydrolase and glutathione S-transferase in rats by bis(dimethyldithiocarbamato) zinc (ziram) (1986)
    Springer
    Bulletin of environmental contamination and toxicology 37 (1986), S. 53-54 
    Details
    ISSN: 1432-0800
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01607728
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  • 3
    Electronic Resource
    Electronic Resource
    In vitro inactivation of hepatic alcohol dehydrogenase and aldehyde dehydrogenases from rats by dithiocarbamates with or without metals (1988)
    Springer
    Bulletin of environmental contamination and toxicology 41 (1988), S. 540-547 
    Details
    ISSN: 1432-0800
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02020998
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  • 4
    Electronic Resource
    Electronic Resource
    Microanalysis of art objects: Objectives, methods and results (1985)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 322 (1985), S. 181-193 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary The potential of chemical and physical techniques for the study of art objects is discussed. It is shown that especially microtrace and surface analysis allows to gain important information on the structure and origin of materials, the authenticity of art objects, ageing and destruction process. Results of investigations of metallic objects, paintings, enamels, illuminated manuscripts and medieval glass paintings are presented.
    Notes: Zusammenfassung Die Aussagefähigkeit chemischer und physikalischer Analysentechniken für das Studium von Kunstobjekten wird diskutiert. Dabei wird gezeigt, daß insbesondere die Mikro-, Spuren- und Oberflächenanalyse wichtige Informationen über Aufbau und Herkunft der verwendeten Materialien, die Originalität eines Objektes, sowie über Alterungs- und Zerstörungsprozesse liefern können. Es werden Ergebnisse der Untersuchungen von Metallobjekten, Gemälden, Email, illuminierten Handschriften und mittelalterlichen Glasgemälden vorgestellt.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00517657
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  • 5
    Electronic Resource
    Electronic Resource
    Quantitative NRA and SIMS depth profiling of hydrogen in naturally weathered medieval glass (1988)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 331 (1988), S. 428-432 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary NRA and SIMS measurements were carried out with samples from naturally weathered medieval glass paintings in order to study the quantitative depth distribution of hydrogen in the surface layers. The major parts of the profiles show good agreements in shape and depth. Nevertheless, differences were observed in the near-surface region. It could be shown that proper attention has to be paid to the vacuum environment of the instruments and to sample preparation before evacuation in order to avoid evaporation of hydrogen containing species incorporated into the silicate structure during leaching or weathering.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00481921
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  • 6
    Electronic Resource
    Electronic Resource
    Surface analytical investigations of leached potash-lime-silica glass (1989)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 333 (1989), S. 386-387 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The layers formed on surfaces of leached silicate glass with potassium and calcium oxides were investigated by secondary ion mass spectrometry and nuclear reaction analysis. The results revealed a distinct influence of the corroding media on the leaching kinetics of the glasses. Details are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00572331
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  • 7
    Electronic Resource
    Electronic Resource
    Interaction ofN-acetyl-4-, 7-, 8- or 9-deoxyneuraminic acids andN-acetyl-4-, 7- or 8-mono-epi- and-7,8-di-epineuraminic acids withN-acetylneuraminate lyase (1987)
    Springer
    Glycoconjugate journal 4 (1987), S. 361-369 
    Details
    ISSN: 1573-4986
    Keywords: N-acetylneuraminate lyase ; N-acetyl-deoxyneuraminic acids ; N-acetyl-epineuraminic acids ; sialic acids ; competitive inhibition
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Various deoxy- and epi-derivatives ofN-acetylneuraminic acid were synthesized and tested for their substrate properties withN-acetylneuraminate lyase fromClostridium perfringens.N-Acetyl-9-deoxyneuraminic acid is a good substrate,N-acetylneuraminic acid derivatives with epimeric configuration at C-7, C-8 or both are cleaved slowly, whileN-acetyl-4-epi-,N-acetyl-4-deoxy-,N-acetyl-7-deoxy-andN-acetyl-8-deoxyneuraminic acid are resistant to enzyme action.N-Acetyl-4-deoxyneuraminic acid andN-acetyl-4-epineuraminic acid competitively inhibit the enzyme. These studies give further insight into a mechanism proposed for the reversible cleavage of sialic acids byN-acetylneuraminate lyase.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01048369
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  • 8
    Electronic Resource
    Electronic Resource
    The extensible uplifted strip (1989)
    Springer
    Acta mechanica 80 (1989), S. 227-257 
    Details
    ISSN: 1619-6937
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary The frictional contact behaviour of extensible and flexible strips on rigid ground and loaded by transversal pressure is considered analytically. Complete and asymptotic solutions are presented. For specific cases diagrams are derived which can be used for engineering applications. One practical relevance of these problems is discussed with regard to the uplift of the bottom plate of vertical unanchored liquid storage tanks. The complicated behaviour of the uplift of a strip adhered to the ground is briefly investigated. Analytically obtained results of these nonlinear problems are compared with finite element solutions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01176162
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  • 9
    Electronic Resource
    Electronic Resource
    Evaluation of heavy water for indicator dilution cardiac output measurement (1989)
    Springer
    Journal of clinical monitoring and computing 5 (1989), S. 236-242 
    Details
    ISSN: 1573-2614
    Keywords: Monitoring: cardiac output ; Measurement techniques: indicator dilution thermodilution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science , Medicine
    Notes: Abstract We evaluated deuterium oxide (D2O) as a tracer for cardiac output measurements. Cardiac output measurements made by thermodilution were compared with those made by indicator dilution with D2O and indocyanine green as tracers. Five triplicate measurements for each method were made at intervals of 30 minutes in each of 9 anesthetized, mechanically ventilated goats. Cardiac output ranged between 0.68 and 3.79 L/min. The 45 data points yielded a correlation coefficient of 0.948 for the comparison of D2O indicator dilution cardiac output measurements with thermodilution measurements and a linear regression slope of 1.046. D2O indicator dilution measurements were biased by −0.11±0.22 L/min compared with thermodilution measurements and had a standard deviation of ±0.12 L/min for triplicate measurements. Hematocrits ranging between 20 and 50 vol% had no effect on optical density for D2O. D2O is more stable than indocyanine green and approximately one-tenth the price (40 cents per injection compared with $4). The basic instrumentation cost of approximately $9,000 is an additional initial expense, but provides the ability to perform pulmonary extravascular water measurements with a double-indicator dilution technique. D2O has potential as a tracer for the clinical determination of indicator dilution cardiac output measurements and pulmonary extravascular water measurements.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01618253
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  • 10
    Electronic Resource
    Electronic Resource
    Predicting carcinogenicity of petroleum distillation fractions using a modified Salmonella mutagenicity assay (1986)
    Springer
    Cell biology and toxicology 2 (1986), S. 63-84 
    Details
    ISSN: 1573-6822
    Keywords: Ames assay ; carcinogenicity ; mutagenicity ; petroleum
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract The Ames Salmonella/microsomal activation mutagenesis assay has been modified to improve sensitivity and reproducibility to complex mixtures derived from the refining and processing of petroleum. Oil samples were dissolved in cyclohexane and subsequently extracted with dimethyl sulfoxide to produce aqueous compatible solutions which readily interact with tester bacteria. Also, the liver homogenate (S-9) and NADP cofactor concentrations were increased and hamster rather than rat liver S-9 was used. The initial slope of the dose response curve relating mutagenicity (revertants per plate) to the dose of extract added was used as an index of mutagenic activity, this slope was obtained through a computerized curve fitting procedure. The modified assay was used to rank 18 oil samples for mutagenic activity, this ranking correlates highly (r = 0.92) with potency rankings of the same samples previously determined from dermal carcinogenicity bioassays. Sensitivity and reproducibility of the assay are sufficient to permit routine use for detecting potential carcinogenic activity of individual refinery streams and blends which contain components boiling above 500°F.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00117708
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