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Browsing ELibrary by Title
Now showing items 7172-7191 of 21934
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(2005)Investigations and syntheses of meso- and microporous sulfides and selenides received in general much less attention than those of silicate and oxide families. Moreover, data on such compounds are scattered ...
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(2003)A new mechanism of micro-structural overpressure caused by the rock or mineral differences in structure and mechanical properties is applied to study the producing of ultra-high pressure metamorphic (UHPM) rocks and minerals. ...
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(1996)This paper is a performance evaluation of a prototype laser-ablation microanalytical system composed of an UV Excimer laser and a high-sensitivity inductively coupled plasma mass spectrometer (XLA-ICP-MS). The laser was ...
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(2002)This paper describes in situ analysis methods for determination of nitrogen abundance, δ13C, and δ15N in diamond by secondary ion mass spectrometry (SIMS). The simple chemical composition of diamond results in the absence ...
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(1996)The influence of native microorganisms on mineral dissolution and precipitation was examined in a petroleum-contaminated aquifer near Bemidji, Minnesota. In-situ microcosms containing clean silicate fragments were established ...
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(2006)Microbial contributions to the detritus of two vascular plant tissues, smooth cordgrass (Spartina alterniflora) and black mangrove leaves (Avicennia germinans), were estimated over a 4-year decomposition period under ...
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(1999)Bytownite feldspar was dissolved in batch reactors in solutions of starch (glucose polymer), gum xanthan (glucose, mannose, glucuronic acid), pectin (poly-galacturonic acid), and four alginates (mannuronic and guluronic ...
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(2004)The effect of microorganisms on the fate of Cd introduced into the soil as cadmium oxide (CdO) was investigated. Cadmium oxide (875 µg Cd per gram of soil) was added to γ-irradiated (sterile) and non-sterile soils. The ...
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(1997)Numerous early diagenetic siderite concretions previously described have been interpreted as the results of microbially mediated reactions. Interpretation of oxygen isotope data for such material requires an understanding ...
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(2003)Microbial sulfate reduction is thought to stimulate carbonate precipitation in modern stromatolites, yet whether this metabolism was important in shaping Precambrian stromatolites is unknown. Here we use geochemical modeling ...
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(2001)The importance of different anaerobic processes leading to CH4 production in rice paddies is quantified by a combination of experiments and model. A mechanistic model is presented that describes competition for acetate and ...
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(2003)Fossil bacterial remains from black carbonate shales of the Sinsk Formation from the Lower Cambrian of the Siberian Platform are studied. The main types of fossil microbial remains found in these strata are described.
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(2002)Although the flux of molecular O2 between the atmosphere and the subsurface is intrinsically linked to the net soil production of greenhouse gasses, few studies have focused on the controls affecting the isotopic composition ...
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(1997)This experimental study investigated the processes by which microbes interact with oxyhydroxide mineral surface coatings using an approach designed to better represent the conditions of natural subsurface environments. The ...
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(1997)Previous studies of ordinary chondrites (OC) reported isolated microchondrules within the fine-grained or clastic matrix of many type-3 samples; larger sets of microchondrules have also been found as rare clasts in type-3 ...
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(2004)Microcodium is a problematic calcitic microfeature of many calcretes and calcareous paleosols in the Cretaceous and Tertiary continental and marine successions of the peri-Tethyan realm. The main controversy about the ...
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(1990)The matter that ascends toward mid-ocean ridge because of large-scale mantle circulation (on the order of the dimensions of the lithospheric plates) undergoes partial fusion. The result is the accumulation of a layer of a ...
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(1988)This article presents and discusses the results of analyses of microcrystalline chrome spinellids from rocks of the alkalic ultramafic series in the Maymecha-Kotuy and the Karelia-Kola regions and from kimberlites, chiefly ...
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(1985)The very fine-grained (≃1 μm) polygonal microcrystalline texture occurring in the groundmass of pseudotachylite veins in the Harris meta-anorthosite and its variation with position are described and an origin by crystallization ...
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(1999)In situ noble gas analyses using a laser microprobe with a beam diameter of 50-100 μm were performed on thin slices of Murchison and Yamato (Y-) 791198 CM carbonaceous chondrites in order to see microdistribution of ...
Now showing items 7172-7191 of 21934