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Browsing ELibrary by Title
Now showing items 10561-10580 of 21934
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(2002)Laser ablation inductively coupled plasma mass spectrometry was used to measure abundances of P, Cr, Fe, Co, Ni, Cu, Ga, Ge, As, Mo, Ru, Rh, Pd, Sn, Sb, W, Re, Os, Ir, Pt, and Au in metal grains in the Bencubbin-like ...
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(1999)We report a series of metal-silicate partitioning experiments for Ga, Ge, and Sn to characterize the dependence of the partition coefficient, D, on oxygen fugacity, fO2. These were isothermal (1260°C) and isobaric (1 bar) ...
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(2003)Siderophores are Fe(III)-specific ligands produced by many aerobic microorganisms under conditions of iron stress. This study examined adsorption of the commercial trihydroxamate siderophore, desferrioxamine B (DFO-B), to ...
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(2002)The purpose of this study was to quantify siderophore production by the aerobic bacterium, Pseudomonas mendocina, under Fe-limited conditions as a function of Fe source: supplied in dissolved form (as 30 μM Fe-EDTA), as ...
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(1995)Siderophores are highly Fe(III)-specific bidentate ligands excreted by aerobic and facultative anaerobic microorganisms to facilitate Fe uptake in oxic environments. These compounds are thought to influence mineral weathering ...
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(2005)Metal ions have critical functions in biological processes and provided important biological feedbacks with the environment throughout earth history. For example, Fe, Ni, Mg, Mn, Mo, Cu, W, V, and Zn play an essential role ...
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(2003)Pyroxenes of pigeonitic and augitic bulk compositions in H3-4 chondritic meteorites commonly exhibit sigmoidal precipitates, rather than the elsewhere common lamellar associations. Most often, submicrometric sigmoids with ...
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(1997)The paper describes data of analysis of the uppermost (8 to 14 m) layer of bottom sediments of Lake Baikal sampled by tube corers on the top of the underwater Akademichesky Ridge at three sites separated by large distances ...
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(2003)We have evaluated the highly siderophile element (HSE) signatures of the martian (SNC) meteorites using new and literature data. These Ir and Os concentrations correlate with the Mg# [molar Mg/(Mg+Fe)], Cr and Ni, suggesting ...
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(2002)The detailed taxonomy of Czekanowskiales and genus Coniopteris dominating in Jurassic paleoflora of West Siberia, composition and stratigraphic confinement of their assemblages, and species of a restricted stratigraphic ...
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(2002)Corganic/Ntotal values change from ~5 in middle Miocene sediments deposited under the Benguela Current upwelling system to ~15 in latest Miocene and Pliocene sediments. Although the change appears to record a larger ...
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(1988)We investigated liparite domes that include Pliocene obsidians and perlites in the Kel'badzhar region of Azerbaidzhan. Elements of perlitic texture are identifiable in pumice and obsidian, as a result of which they too may ...
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(2002)The South Caspian basin has been a major petroleum-producing province for more than a century. While the basin's oil has been the focus of a number of studies the region's gas has been largely understudied. This study ...
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(2000)Taxonomic composition of six stratigraphically important Riphean microbiotas from the southern Urals (Bashkirian meganticlinorium) and adjacent region (the Verkhnyaya Kama depression of the Kama-Belaya aulacogen) is ...
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(1995)A mantle value of # 17.5 for NbTa appears well established; less well established are crustal values of # 11-12, although it appears that NbTa for crustal-derived melts is less than mantle NbTa, demonstrating fractionation ...
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(2001)Potential mineralization of volcanic structures is determined by geochemical potential of composing rhyolites, i.e. by original silver (and gold) content in unaltered rocks. It is realized due to metasomatic transformations ...
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(1992)An examination was made of the geological, textural-structural, mineralogical and geochemical signs indicating that the dunites forming the Konder massif were in the solid phase during their intrusion into the upper layers ...
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(2006)Group IVA is a large magmatic group of iron meteorites. The mean ?17O (=?17O - 0.52??18O) of the silicates is ?+1.2?, similar to the highest values in L chondrites and the lowest values in LL chondrites; ?18O values are ...
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(1998)Mantle peridotite xenoliths from Archean cratons generally have high molar Mg/(Mg + Fe), or Mg#. The best known suites, from the Kapvaal and Siberian cratons, have high modal orthopyroxene (Opx). These high Opx compositions ...
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(2002)In-situ Raman measurements of silica speciation in aqueous fluids in equilibrium with solid quartz are reported to 14 kbar and 900 °C. Silica speciation in the fluid depends strongly on temperature and pressure. The Raman ...
Now showing items 10561-10580 of 21934