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Browsing ELibrary by Title
Now showing items 4224-4243 of 26297
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DISTRIBUTION PATTERNS OF DIFFERENT FORMS OF PHOSPHORUS IN SOME SURFICIAL SEDIMENTS OF THE BALTIC SEA (1991)The lateral distribution patterns of different forms of phosphorus (P) in some Baltic Sea sediments were investigated by a sequential extraction procedure. The distribution and amount are mainly related to redox state, ...
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(2002)This paper describes coal petrographic characteristics, sulfur abundance, distribution and isotopic signature in coals in the Wuda coalfield, Inner Mongolia, northern China. Petrographic studies suggest that depositional ...
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(2001)The Cretaceous/Tertiary (K/T) boundary, with an age of 65 million years before present, is associated with the mass extinctions of dinosaurs and other terrestrial and marine organisms. Evidence for the K/T boundary is ...
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(2002)It has recently been shown that membrane lipids of marine crenarchaeota, a ubiquitous and abundant component of plankton, occur in relatively high concentrations in recent and ancient sediments. In this study we investigated ...
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(1999)Although recent research has indicated that bacteria may contribute an important fraction of biochemical residues in terrestrial and marine environments, it is difficult for geochemists to identify contributions from these ...
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(1988)The increased sensitivity and frequency resolution of the laser-interferometric strain seismometer makes it possible to undertake new types of investigation of the correlation between high-frequency microseism-induced ...
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DISULFIDE DISPROPORTIONATION AND CDS FORMATION UPON CADMIUM SORPTION ON FES2 - THEORY AND EXPERIMENT (2000)Adsorption reactions are important for understanding the distribution of ions between aqueous and solid phases; they govern solution concentrations, bioavailability, and mobility of ions in the environment. Iron disulfide ...
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(1988)The paper reports on a study which shows that there is a diurnal variability in the distribution of suspended forms of heavy metals; the temporal variation in the concentration of suspended matter and in the suspended forms ...
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(2006)Diurnal variations of hydrochemistry were monitored at a spring and two pools in a travertine-depositing stream at Baishuitai, Yunnan, SW China. Water temperature, pH and specific conductivity were measured in intervals ...
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(2004)Compounds that contain the autunite-type sheet and divalent cations (Mg, Mn, Fe, Co, Ni) in their interlayers have been synthesized by diffusion in gels or by hydrothermal methods, and their crystal structure determined. ...
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(2006)In the Central American arc, southeastern Guatemala hosts the most diverse volcanism. Large stratovolcanoes at the volcanic front (VF) form as a result of subduction of the oceanic Cocos plate beneath the continental ...
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(2002)Polypteriformes (or Cladistia) and Lepisosteiformes (or Ginglymodi) are two groups of freshwater fishes with ganoid scales. The earliest fossil records of these taxa are Albian (Lepisosteiformes) and Cenomanian (Polypteriformes) ...
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(2006)Comparative analysis of taxonomic diversity dynamics of condontophorids from Boreal (Arctic regions of Russia) and Tethyan (Northwest Pacific) paleobasins showed that they had most favorable habitat environments in tropical ...
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(2006)The diversity of the brachiopods in the Northern Caucasus significantly fluctuated throughout the Paleozoic-Mesozoic. Weak diversifications occurred in the Middle Cambrian, Late Silurian - Early Devonian, and Late Devonian ...
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(2003)Curves depicting the diversity dynamics of fusulinid genera in general and in some individual biogeographic provinces are provinces are plotted. Some of them illustrate dynamics of appearance and extinction of fusulinid ...
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(2006)The diversity and changing patterns of rugose corals in the Carboniferous and Permian of South China are analysed by statistical analyses of 45 families, 284 genera, and 1979 species from 14 consecutive time intervals. The ...
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(2003)Djerfisherite K6Na(Fe,Ni,Cu)24S26Cl, first discovered in meteorites [1], was subsequently found in Cu–Ni ores, kimberlites, alkaline ultrabasic rocks and car-bonatites, peralkaline rocks, and in skarns around alka-line ...
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(2006)This paper describes our recent extraction of ancient DNA (aDNA) from Holocene pollen and discusses the potential of the technique for elucidating timescales of evolutionary change. We show that plastid DNA is recoverable ...
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(2006)Rare earth elements (REE) concentrations of Archean and Proterozoic chemical sediments are commonly used as proxies to study secular trends in the geochemistry of Precambrian seawater. In addition, similarities in the REE ...
Now showing items 4224-4243 of 26297