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  • 1995-1999  (3)
  • 1985-1989  (8)
  • 1
    ISSN: 1520-6904
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 326 (1987), S. 179-181 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Extensive research has been conducted since the first discovery and identification of geohopanoids3. Investigations have concentrated on the stereochemical transformations of this compound class in order to obtain maturity indicators for organic matter4. Although the biological precursors of fossil ...
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The Okinawa Trough, located between the Ryukyu island chain and the east coast of China, is an active back-arc basin formed by extension within the continental lithosphere behind the Ryukyu trench-arc system. Evidence for the presence of active back-arc spreading exists only in the southern trough, ...
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Naturwissenschaften 73 (1986), S. 731-734 
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1573-0581
    Keywords: volcanology ; hotspot ; Pacific ; Macdonald ; petrology ; Austral Islands
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The southeastern extension of the Austral Islands volcanic chain terminates near 29°S, 140°W at the active Macdonald Seamount. The ‘hotspot’ region near Macdonald consists of at least five other volcanic edifices each more than 500 m high, included in an area about 50–100 km in diameter. On the basis of the sea-floor topography, the southeastern limit of the hotspot area is located about 20 km east of the base of Macdonald, where it is defined by the 3950 m isobath. At the edge of the hotspot area, there is a marked deepening of the seafloor from c.3900 m down to 4000–4300 m. The deeper sea-floor is faulted and heavily sedimented. The Macdonald volcano itself stands 3760 m above the surrounding seafloor, and has a basal diameter of 45 km. Its summit in January 1987 was 39 m below sea level, and it seems likely that Macdonald will emerge at the surface in the near future. Recent (March and November 1986) phreatic explosions on Macdonald Seamount erupted fragments of ultramafic and mafic plutonic blocks together with basic lapilli (volcaniclastic sand). The plutonic blocks have been variably altered and metamorphosed, and in some cases show signs of mineralisation (disseminated sulphides). The blocks presumably come from deeper levels in the volcanic system. The volcanics so far dredged from Macdonald consist of olivine and clinopyroxene cumulus-enriched basalts, evolved basalts, and mugearite. On the basis of incompatible element variations, simple crystal fractionation seems to be controlling the chemical evolution of Macdonald magmas.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Naturwissenschaften 82 (1995), S. 139-142 
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Naturwissenschaften 82 (1995), S. 139-142 
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Journal of radioanalytical and nuclear chemistry 112 (1987), S. 331-339 
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract A facility for the irradiation of internal targets has been installed at the research reactor FRG-of the GKSS Research Center. Thermal-neutron induced prompt gamma radiation was detected by pair spectrometer. With this experimental arrangement concentrations of the major and mino elements Na, Al, Si, K, Ca, Ti, Mn, Fe, Zn, Cl, and S, as well as of the trace constituents Cr Ni, Cu Cd, and Hg of samples from a sediment core of the Elbe River could be determined. The results indicate, that prompt gamma-ray neutron activation analysis (PGNAA) is a powerful instrumental tool for a complete characterization of the main sediment constituents and for the detection of the trace elements Cd and Hg which are of considerable ecological relevance.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' Zeitschrift für analytische Chemie 335 (1989), S. 914-918 
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The suitability of total-reflection X-ray fluorescence analysis (TXRF) for multi-element determination in whole blood and human serum has been investigated. In combination with microwave digestion with nitric acid the elements P, S, K, Ca, Fe, Cu, Zn, Se, Rb, Sr, and Pb were determined in samples from several patients. The detection limits for heavy metal traces are in the range of 0.02 –0.08 μg/ml, the precision is in the range of 2 –10%. The elements Mn, Ni and Pb could additionally be determined after iron-(only necessary for whole blood) and salt-matrix separation. In this way the detection limits could be improved by more than one order of magnitude (0.002 μg/ ml). The accuracy of the results and the reliability of the analytical procedures are checked with the help of several certified reference materials. In general the accuracy is in the range of 2–15%.
    Type of Medium: Electronic Resource
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  • 10
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary In environmental research and protection trace elements have to be determined over a wide range of atomic number, down to very low concentrations, and in quite different matrices. This challenge requires the availability of complementary analytical methods characterized by a high detection power and few sources of systematic errors. Besides, the capacity of multielement detection is often desired since it facilitates the tackling of many problems in which numerous trace elements are of direct concern. Total reflection X-ray fluorescence, neutron activation analysis and inductively coupled plasma optical emission spectroscopy, in principle, fulfill these requirements quite well. However, each method has its domain, and the application to certain sample species may be less promising. Under this aspect, the paper summarizes some recent developments and investigations, including intercomparisons as far as possible. Various matrices are considered: rainwater and airborne particulates, soil samples, river sediments and suspended particulate matter, river water filtrates, ovean water, and organic matrices. Capabilities and limitations are discussed. Sample preparation techniques are described if they are new or essential for achieving the results given.
    Notes: Zusammenfassung Umweltforschung und Umweltschutz erfordern die Bestimmung von Spurenelementen über einen weiten Bereich der Ordnungszahl, z. T. bis in den extremen Spurenbereich und in ganz unterschiedlichen Matrices. Die Erfüllung dieser Aufgabe setzt die Verfügbarkeit einander ergänzender analytischer Verfahren voraus, die durch eine hohe Nachweisstärke und geringe systematische Fehler gekennzeichnet sein müssen. Hinzu kommt, daß vielfach Multielement-Eigenschaften wünschenswert sind, da bei manchen Fragestellungen zahlreiche Elemente von Interesse sind. Die Totalreflexions-Röntgenfluorescenzanalyse, die Neutronenaktivierungsanalyse und die optische Emissionsspektroskopie mit induktiv angeregter Plasmafackel erfüllen grundsätzlich diese Forderungen in hohem Maße. Jedoch besitzt jede Methode ihre besonderen Stärken, und Anwendungen auf bestimmte Probenarten können weniger erfolgreich sein. Der vorliegende Beitrag faßt unter diesem Aspekt einige neuere Entwicklungen und Untersuchungen zusammen, wobei nach Möglichkeit Vergleiche der verschiedenen Verfahren angestellt werden. Dabei werden die folgenden Matrices behandelt: Niederschlag und luftgetragene Partikel, Bodenproben, Flußsedimente und Schwebstoffe, Flußwasserfiltrate, Ozeanwasser und einige organische Matrices. Die Einsatzmöglichkeiten und die Leistungsgrenzen werden diskutiert. Die Probenvorbereitungstechniken werden beschrieben, sofern sie neu sind oder eine wesentliche Voraussetzung für die Erzielung der angegebenen Ergebnisse darstellen.
    Type of Medium: Electronic Resource
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