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  • 1
    Electronic Resource
    Electronic Resource
    A Solids Inlet System for a Mass Spectrometer (1961)
    s.l. : American Chemical Society
    Analytical chemistry 33 (1961), S. 476-477 
    Details
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ac60171a054
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  • 2
    Electronic Resource
    Electronic Resource
    A mechanism for framboid formation as illustrated by a volcanic exhalative sediment (1982)
    Springer
    Mineralium deposita 17 (1982), S. 23-36 
    Details
    ISSN: 1432-1866
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract A sequence of oxidate facies sediments associated with a cupriferous massive sulphide deposit in the Solomon Islands is the product of precipitation at an exhalative fluid/seawater interface. A siliceous sinter bed within the sediments contains magnesioferrite spheroids having a distinctive framboid texture. Scanning electron micrographs of the spheroids show an internal structure of parallel rods composed of sub-spherical microcrysts. The formation of the magnesioferrite framboid texture is ascribed to the coagulation of magnetic iron hydroxide gel particles due to magnetic attraction but facilitated by the presence of a strong electrolyte. By analogy a simple mechanism to account for pyrite framboid formation is proposed. This mechanism requires primary iron sulphide particels to be attracted to one another because of the ferrimagnetic properties of a precursor FeS polymorph or alternatively by Van der Waals forces accentuated by the presence of charged ions in a strong electrolyte. Ordering of resultant microcrysts is mainly a close-packing effect which produces robust aggregates resistant to deformation during subsequent diagenesis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00206374
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  • 3
    Electronic Resource
    Electronic Resource
    Manganese oxide mineralogy in an exhalative environment from the Solomon Islands (1983)
    Springer
    Mineralium deposita 18 (1983), S. 113-125 
    Details
    ISSN: 1432-1866
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract The mineralogy and chemistry of oxidate facies sediments associated with a Solomon Island cupriferous pyrite deposit are described. Systematic variations in sediment composition are consistent with the gradual imposition of an oxidising environment on a pool of exhaled solution lying in a topographic depression on the sea floor. Manganese is first precipitated in the Mn2+ oxidation state as pyrochroite, γMn(OH)2. With later seafloor weathering and diagenesis, this oxidises initially to the Mn3+ intermediate minerals manganite (γMnO.OH) or, in the presence of iron hydroxides, to groutite (αMnO.OH). Subsequently, these oxidise further to Mn4+ as the βMnO2 dimorphs pyrolusite or ramsdellite, respectively. Todorokite (δMnO2) is indicative of more oxidising conditions and is found in the upper horizons of the manganiferous sediment. It is invariably non-stoichiometric in composition and its Mn2+/Mn4+ ratio is a direct function of the Eh prevailing during its precipitation. Adsorption of Na+, K+, Ca2+ and Ba2+ions at the time of formation stabilises the todorokite structure and provides an explanation for its persistence (with its Mn2+ions) in association with the completely oxidised Mn4+ mineral, βMnO2, pyrolusite. The enrichment of Cu, Zn and Pb in manganiferous sediments from both pelagic and exhalative environments is associated with the occurrence of goethite. The enrichment of K, Ba and Ca in manganiferous sediments from a similar range in environments is associated with the occurrence of todorokite. Both the mineralogy and trace element characteristics of a manganiferous sediment are thus a function of the environment of deposition rather than the ultimate source of the metals concerned. The trace element contents of manganiferous “floaters” should therefore only be used as an indicator of related sulphide mineralisation in the presence of other favourable factors.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00206699
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  • 4
    Electronic Resource
    Electronic Resource
    A mechanism for framboid formation — The role of bacteria. A reply to Dr. S. I. Kalogeropoulos and a further contribution (1983)
    Springer
    Mineralium deposita 18 (1983), S. 129-130 
    Details
    ISSN: 1432-1866
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00206701
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  • 5
    Electronic Resource
    Electronic Resource
    Major's Creek, N.S.W., Australia — A Devonian epithermal gold deposit (1988)
    Springer
    Mineralium deposita 23 (1988), S. 239-246 
    Details
    ISSN: 1432-1866
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Mineralized veins at Major's Creek consist of preponderant quartz and carbonate gangue with gold, Au-Ag tellurides and base metal sulphides within silicified and sericitized dykes or granodiorite of the Braidwood Granite. Fluid inclusion studies indicate deposition throughout the range 350–80°C by low salinity fluids. Significant Au-Ag telluride mineralization took place at a temperature of about 155°C. Mineral deposition was due to the separation of a liquid CO2 phase from an originally CO2-rich aqueous fluid. Observed argillic alteration is a consequence of acid leaching above the boiling zone. Mineralization is epithermal in character and probably formed during the existence of a hydrothermal convective system. A relationship with similar epithermal gold deposits in the adjacent Eden-Yalwal Rift zone is inferred.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00206401
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  • 6
    Electronic Resource
    Electronic Resource
    Dosage prescribing and plasma oxipurinol levels in patients receiving allopurinol therapy (1990)
    Springer
    European journal of clinical pharmacology 39 (1990), S. 419-421 
    Details
    ISSN: 1432-1041
    Keywords: allopurinol renal function ; oxipurinol pharmacokinetics drug metabolism prescribing
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary This study examined dosage prescribing patterns and steady-state oxipurinol plasma concentrations in 66 patients receiving chronic allopurinol therapy. Most patients (65%) were taking 300 mg allopurinol daily, although renal impairment was common. Using published guidelines, it was estimated that 35% of patients were receiving excessive dosages of allopurinol. Consequently, the plasma oxipurinol concentrations were often very high (mean (SD) was 156 (109) μmol·1−1). Accumulation of oxipurinol was inversely related to renal function. Plasma concentrations of oxipurinol and urate were not significantly related. However, most patients with oxipurinol concentrations of up to 100 μmol·1−1 had urate concentrations within the normal reference range.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00315424
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  • 7
    Electronic Resource
    Electronic Resource
    Laboratory Production of the Vegard – Kaplan Bands (1955)
    [s.l.] : Nature Publishing Group
    Nature 175 (1955), S. 254-254 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Fig. 1. Narrow section of simple discharge tube for excitation of Vegard-Kaplan banda Like previous workers, we have not found it possible to eliminate completely the y-bands of NO and the 2537 A. line of mercury. The main ultra-violet Vegard - Kaplan bands were obtained from this source at ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/175254a0
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  • 8
    Electronic Resource
    Electronic Resource
    Space Microbiology (1974)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Microbiology 28 (1974), S. 121-137 
    Details
    ISSN: 0066-4227
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.mi.28.100174.001005
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  • 9
    Electronic Resource
    Electronic Resource
    Lubricating Value as Related to Certain Physical and Chemical Properties of Oils (1926)
    s.l. : American Chemical Society
    Industrial & engineering chemistry 18 (1926), S. 493-496 
    Details
    ISSN: 1520-5045
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ie50197a014
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  • 10
    Electronic Resource
    Electronic Resource
    Inhibition of thymidylate biosynthesis induces mitotic unequal sister chromatid recombination in Saccharomyces cerevisiae (1984)
    Springer
    Current genetics 8 (1984), S. 211-217 
    Details
    ISSN: 1432-0983
    Keywords: dTMP starvation ; Sister chromatid recombination ; rad mutants
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Inhibition of thymidylate biosynthesis has been found to induce deletion of a LEU2 insert from the ribosomal DNA gene cluster of haploid strains of Saccharomyces cerevisiae. Loss of the insert was detected phenotypically by the enhanced production of both sectored (leu+/leu−) and non-sectored (leu−) colonies. Hybridization patterns obtained by Southern blot analysis of DNA from the leu+ and leu− sectors were consistent with the occurrence of unequal sister chromatid recombination. The induction of sectored colonies was prevented by the rad52-1 mutation but not by defects in RAD6. However, the formation of non-sectored leu− colonies was induced by thymidylate depletion in both rad52-1 and rad6 strains.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00417818
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