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  • Analytical Chemistry and Spectroscopy  (4)
  • Geochronology  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Petrology and geochronology of basalt breccia from the 1996 earthquake swarm of Loihi seamount, Hawaii: magmatic history of its 1996 eruption (1998)
    Springer
    Bulletin of volcanology 59 (1998), S. 577-592 
    Details
    ISSN: 1432-0819
    Keywords: Key words Hawaii ; Loihi ; Magmatic processes ; Submarine volcanism ; Petrology ; Geochronology ; Lava geochemistry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract  Samples of basalt were collected during the Rapid Response cruise to Loihi seamount from a breccia that was probably created by the July to August 1996 Loihi earthquake swarm, the largest swarm ever recorded from a Hawaiian volcano. 210Po–210Pb dating of two fresh lava blocks from this breccia indicates that they were erupted during the first half of 1996, making this the first documented historical eruption of Loihi. Sonobuoys deployed during the August 1996 cruise recorded popping noises north of the breccia site, indicating that the eruption may have been continuing during the swarm. All of the breccia lava fragments are tholeiitic, like the vast majority of Loihi's most recent lavas. Reverse zoning at the rim of clinopyroxene phenocrysts, and the presence of two chemically distinct olivine phenocryst populations, indicate that the magma for the lavas was mixed just prior to eruption. The trace element geochemistry of these lavas indicates there has been a reversal in Loihi's temporal geochemical trend. Although the new Loihi lavas are similar isotopically and geochemically to recent Kilauea lavas and the mantle conduits for these two volcanoes appear to converge at depth, distinct trace element ratios for their recent lavas preclude common parental magmas for these two active volcanoes. The mineralogy of Loihi's recent tholeiitic lavas signify that they crystallized at moderate depths (∼8–9 km) within the volcano, which is approximately 1 km below the hypocenters for earthquakes from the 1996 swarm. Taken together, the petrological and seismic evidence indicates that Loihi's current magma chamber is considerably deeper than the shallow magma chamber (∼3–4 km) in the adjoining active shield volcanoes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004450050211
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    High performance gel filtration using monodisperse highly cross-linked agarose as a one-step system for mucin purification (1993)
    New York, NY : Wiley-Blackwell
    Biomedical Chromatography 7 (1993), S. 68-74 
    Details
    ISSN: 0269-3879
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine
    Notes: High performance gel filtration on monodisperse cross-linked agarose (Superose 6) has been assessed as a system for purification of mucus glycoproteins. Comparison with the conventional two-step purification of mucus glycoprotein by Sepharose CL4B gel filtration followed by caesium chloride density gradient centrifugation shows that purification by high performance gel filtration is at least as thorough, yielding mucin that is free from non-mucin glycoproteins as defined by buoyant density, mobility on sodium dodecyl sulphate-polyacrylamide gel electrophoresis and absence of Concanavalin A binding (mannose-containing) material. This technique allows mucus glycoprotein to be purified from lyophilized crude mucin in 120 min compared with approximately 72 h using the conventional techniques. This makes the comparative study of mucus glycoprotein changes in disease states much more feasible.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bmc.1130070204
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    X-ray fluorescence analysis  -  results of a first round intercomparison study (1974)
    New York, NY [u.a.] : Wiley-Blackwell
    X-Ray Spectrometry 3 (1974), S. 47-50 
    Details
    ISSN: 0049-8246
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: The results are presented of an intercomparison study between twelve investigators and three analytical techniques. The objective was to determine the precision and accuracy with which multi-element analysis of air particulates on filters can be accomplished using energy dispersive X-ray fluorescence spectrometry. Special emphasis was placed on testing calibration techniques and methods of correction for absorption in both particulate deposits and substrates. Results indicate that errors in calibration and correcting for substrate absorption can be reduced to much less than 10% for elements K and above, but the more work is required to test methods of correcting for particles size to achieve 10% accuracy at energies below 3 keV.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/xrs.1300030110
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Particle size effects in X-Ray emission analysis: Formulae for continuous size distributions (1972)
    New York, NY [u.a.] : Wiley-Blackwell
    X-Ray Spectrometry 1 (1972), S. 107-111 
    Details
    ISSN: 0049-8246
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: New equations have been derived to describe the dependence of characteristic X-ray intensity on particle size in heterogeneous specimens. The formulae include the effects of continuous size distributions, a problem not covered in earlier theoretical work.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/xrs.1300010306
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  • 5
    Electronic Resource
    Electronic Resource
    Particle size effects in X-Ray emission analysis: Simplified formulae for certain practical cases (1972)
    New York, NY [u.a.] : Wiley-Blackwell
    X-Ray Spectrometry 1 (1972), S. 113-117 
    Details
    ISSN: 0049-8246
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: The Berry - Furuta - Rhodes model is used to derive formulae for the characteristic X-ray intensity in specimens of ‘non-infinite’ thickness, as a function of particle size both for discrete values and for continuous distributions, including the Junge distribution for aerosols. Significant simplifications in otherwise complex for mulae are obtained for a number of cases of practical importance, namely, thin specimens, monolayers and low or high packing fractions. The simplified working formulae consist of the equation for a thin, homogeneous specimen, multiplied by a grain size dependent factor. This factor is a function of fluorescent grain size only, so eliminating most inter-element effects. Practical applications of these cussed, with special reference to energy dispersive X-ray fluorescence analysis of thin briquetted specimens and of aerosols collected on filters.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/xrs.1300010307
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    Paper (German National Licenses)
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