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  • 1
    Electronic Resource
    Electronic Resource
    Reactions of acetylenes with noble-metal halides. VIII. The reaction of 2-butyne with palladium chloride (1968)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 90 (1968), S. 5321-5322 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja01021a075
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    Paper (German National Licenses)
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  • 2
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    Unknown
    PARESIS AND THE ALLEGED ASYMMETRY BETWEEN EXPLANATION AND PREDICTION (1966)
    Oxford : Periodicals Archive Online (PAO)
    The British journal for the philosophy of science. 17 (1966:May-1967:Feb.) 313 
    Details
    ISSN: 0007-0882
    Topics: Natural Sciences in General , Philosophy
    URL: http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pao:&rft_dat=xri:pao:article:4064-1966-017-00-000013
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  • 3
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    The Feasibility of Hyperbolical Doubt (1969)
    Minneapolis : Periodicals Archive Online (PAO)
    Philosophical Studies. 20:5 (1969:Oct.) 
    Details
    ISSN: 0031-8116
    Topics: Philosophy
    URL: http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pao:&rft_dat=xri:pao:article:6193-1969-020-05-000002
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  • 4
    Electronic Resource
    Electronic Resource
    Weitere Mittheilungen über die Einwirkung von Kalilösungen auf Glycogen (1878)
    Springer
    Pflügers Archiv 17 (1878), S. 154-164 
    Details
    ISSN: 1432-2013
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01703402
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  • 5
    Electronic Resource
    Electronic Resource
    Das Verhalten der physiologischen Reactionszeit unter dem Einfluss von Morphium, Caffée und Wein (1878)
    Springer
    Pflügers Archiv 16 (1878), S. 316-406 
    Details
    ISSN: 1432-2013
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01647544
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  • 6
    Electronic Resource
    Electronic Resource
    Ueber die Einwirkung warmer Kalilösungen auf Glycogen (1876)
    Springer
    Pflügers Archiv 13 (1876), S. 253-267 
    Details
    ISSN: 1432-2013
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01628934
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  • 7
    Electronic Resource
    Electronic Resource
    In vivo release of endogenous GABA in the cat hypothalamus (1979)
    Springer
    Naunyn-Schmiedeberg's archives of pharmacology 308 (1979), S. 143-147 
    Details
    ISSN: 1432-1912
    Keywords: Hypothalamus ; GABA release ; Superfusion ; Electrical stimulation ; Potassium chloride ; Locus coeruleus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The posterior hypothalamus of anaesthetized cats was superfused with artificial cerebrospinal fluid through a push-pull cannula and the release of endogenous GABA from the hypothalamus into the superfusate was studied. The resting release of GABA varied rhythmically, since phases of high rate of release were separated from each other by phases of low rate of release. The time interval between two adjacent phases of high rate of release was about 70 min. Electrical stimulation of the posterior hypothalamus with the tip of the cannula enhanced the rate of release of GABA in a frequency-dependent way. Superfusion of the hypothalamus with CSF which contained a high concentration of potassium and a low concentration of sodium increased the rate of release of GABA; this effect was dependent on the presence of calcium ions in the superfusing fluid. Pretreatment of the cats with reserpine reduced the levels of GABA in hypothalamus and rest of brain and the concentration of GABA in the superfusate as well. Stimulation of the locus coeruleus with a bipolar electrode elicited an increased release of GABA in the hypothalamus.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00499056
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  • 8
    Electronic Resource
    Electronic Resource
    In vivo release of endogenous catecholamines in the hypothalamus (1979)
    Springer
    Naunyn-Schmiedeberg's archives of pharmacology 308 (1979), S. 137-142 
    Details
    ISSN: 1432-1912
    Keywords: Hypothalamus ; Superfusion ; Catecholamine release ; Electrical stimulation ; Locus coeruleus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The posterior hypothalamus of anaesthetized cats was superfused with a push-pull cannula and the release of the endogenous catecholamines noradrenaline, adrenaline and dopamine was determined in the superfusate. The rate of release of the three catecholamines followed an ultradian rhythm, the time interval between two adjacent phases of high rate of release being about 70 min. Pretreatment of the animals with reserpine decreased the levels of catecholamines in the hypothalamus and rest of the brain and reduced their rate of release into the superfusate. Hypothalamic superfusion with superfusing fluid of high concentration of potassium and low concentration of sodium enhanced the rate of release of noradrenaline and adrenaline; this effect was abolished when the hypothalamus was superfused with calcium-free solution. Electrical stimulation of the locus coeruleus ipsilateral to the superfused hypothalamus increased the release of noradrenaline and adrenaline, stimulation of the contralateral locus coeruleus enhanced the release of noradrenaline, adrenaline and dopamine. In both cases, the rate of release of adrenaline was enhanced to a lesser extent than the rate of release of noradrenaline. The release of noradrenaline and adrenaline was increased to a higher extent on stimulation of the ipsilateral locus coeruleus than on stimulation of the contralateral one.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00499055
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  • 9
    Electronic Resource
    Electronic Resource
    Anreicherung und Bestimmung von Blei in Boden- und Sedimentaufschlüssen und -extrakten mit der Flammenatomabsorption (1978)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 291 (1978), S. 213-216 
    Details
    ISSN: 1618-2650
    Keywords: Best. von Blei in Boden, Sedimenten ; Spektralphotometrie, Atomabsorption ; Flamme, Reextraktion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung In Vorversuchen wurde gezeigt, da\ beim Aufbewahren der organischen APDC/MIBK-Extrakte starke Bleiverluste auftraten. Daher war es notwendig, das Blei mit SalpetersÄure in die wÄ\erige Phase zu reextrahieren. Wiederfindungsversuche bestÄtigten, da\ Extraktion und Reextraktion quantitativ verlaufen. Das Blei wird dabei um den Faktor fünf angereichert. Es werden mittlere Standardabweichungen für vier Konzentrationsbereiche angegeben. Als Nachweisgrenze wurde eine Konzentration von 0,16 mg Pb/l gefunden, die durch die Anreicherung auf ca. 0,03 mg Pb/l gesenkt wird. Arbeitsvorschriften für das Verfahren sind angegeben.
    Notes: Summary Preliminary investigations have shown, that considerable losses of lead occur during storage of the organic APDC/MIBK-extracts. Therefore, it was necessary to reextract lead into the aqueous phase by nitric acid. Investigations of recoveries confirmed, that extraction and reextraction of lead were quantitative. In this way the concentration of lead is increased by a factor of five. Mean standard deviations for four concentration ranges are given. A detection limit of 0.16 mg of Pb/l is obtained, which is lowered by the preceding enrichment to about 0.03 mg of Pb/l. Details of the procedure are given.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00480692
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  • 10
    Electronic Resource
    Electronic Resource
    Bestimmung von Cadmium in Boden- und Sedimentaufschlüssen und -extrakten mit der flammenlosen Atomabsorption in Zirkonium-beschichteten Graphitrohren (1979)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 295 (1979), S. 110-115 
    Details
    ISSN: 1618-2650
    Keywords: Best. von Cadmium in Boden, Sedimenten ; Spektralphotometrie, Atomabsorption ; Zr-beschichtete Graphitrohre
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Es wird ein Verfahren beschrieben, das es gestattet, nach einer Anreicherung von Cadmium durch Extraktion mit APDC/MIBK und anschließender Reextraktion mit Salpetersäure, die stark salpetersaueren Reextrakte direkt in Zirkonium-beschichteten Graphitrohren bei Verwenden der flammenlosen Atomabsorption zu vermessen. Diese Rohre zeigten eine gute Lebensdauer (150–300 Analysen). Durch eine Behandlung der Rohre mit einer Fe3+-Lösung konnten Beeinflussungen der Cadmiumsignale durch Begleitstoffe verhindert werden. Cadmium wird bei der Extraktion und Reextraktion um den Faktor fünf angereichert. Bei hohen Cadmiumgehalten in den Proben kann die Analyse bei gleicher Probenvorbereitung mit Hilfe der Flammenatomabsorption durchgeführt werden. Die Arbeitsbedingungen für die flammenlose, sowie für die Flammen-Atomabsorption werden angegeben. Als Nachweisgrenzen bei Verwenden der flammenlosen Atomabsorption wurden im Mittel 0,53 μg Cd/l, für die Flammenatomabsorption 19,4μg Cd/l gefunden, die durch die Anreicherung auf ca. 0,1, bzw. 4 μg Cd/l gesenkt werden.
    Notes: Summary Cadmium is enriched by an extraction with APDC/MIBK and subsequent reextraction with nitric acid. A procedure is described for analyzing these solutions directly by means of flameless atomic absorption, inspite of the high concentration of nitric acid in a zirconium coated graphite tube. These tubes, proved to be very resistant (150–300 analyses). After treatment of the tubes with a Fe3+-solution no interference by accompanying anions and cations could be observed. By the extraction and reextraction procedure described cadmium is enriched by a factor of five. Samples of higher cadmium concentrations were analyzed by means of flame atomic absorption after the same sample preparation. Working conditions for flameless and flame atomic absorption are given. Detection limits have been calculated as 0.53 μg Cd/l in the case of flameless, 19.4 μg Cd/l in the case of flame atomic absorption. These values are further decreased by the above enrichment procedure to 0.1 and 4 μg Cd/l, respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01171496
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