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Browsing ELibrary by Title
Now showing items 9506-9525 of 21936
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(2003)Botryococcus braunii cells were grown until the late-stationary phase of growth and subsequently decomposed under oxic conditions for 201 days using a microbial consortium obtained from a freshwater lake. Degradation ...
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PRESERVATION OF CROSS-STRATA DUE TO THE MIGRATION OF SUBAQUEOUS DUNES: AN EXPERIMENTAL INVESTIGATION (2002)This experimental investigation examined the controls on the geometry of cross-sets formed by subaqueous dunes. A range of steady, unidirectional flow conditions spanning the field of dune existence was investigated, and ...
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(2002)The carbon and nitrogen isotope composition of organic matter has been widely used to trace biogeochemical processes in marine and lacustrine environments. In order to reconstruct past environmental changes from sedimentary ...
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(2001)Using solid-state cross-polarization-magic-angle-spinning (CPMAS) 13C and 15N nuclear magnetic resonance (NMR) and 2-D double cross polarization (DCP) MAS 15N 13C NMR techniques, microbially degraded Botryococcus braunii ...
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(2004)The contractile stalks of graptoloid zooids are preserved as organic carbon residues in thecae of the middle Llandovery graptoloid graptolites Rastrites geinitzii and Neolagarograptus ? sp. from the Aizpute-41 core, Latvia. ...
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(1993)δ18O andδD values were measured for water in fluid inclusions in minerals from the Beregovo epithermal deposit, Transcarpathia, Ukraine. Directly measuredδ18O values for the water in inclusions in quartz were compared to ...
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(2003)The green alga Botryococcus braunii was degraded for 201 days under oxic conditions in a flow-through system to test whether the macromolecular algaenan surrounding cells could protect proteins from rapid degradation. ...
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(2003)We have determined abundances of presolar diamond, silicon carbide, graphite, and Xe-P1 (Q-Xe) in eight carbonaceous chondrites by measuring the abundances of noble gas tracers in acid residues. The meteorites studied were ...
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(2003)We have developed a procedure that allows extraction of clean nanodiamond samples from primitive meteorites for isotopic analyses of trace elements on a timescale of just a week. This procedure includes microwave digestion ...
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(2003)With a new type of ion microprobe, the NanoSIMS, we determined the oxygen isotopic compositions of small (<1μm) oxide grains in chemical separates from two CM2 carbonaceous meteorites, Murray and Murchison. Among 628 grains ...
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(2003)Grains of stardust that formed in stellar outflows prior to the formation of the solar system survive intact as trace constituents of primitive meteorites. The presolar origin of the grains is indicated by enormous isotopic ...
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(2001)P-wave velocities (VP) and S-wave velocities (VS) and their directional dependence (velocity anisotropy, shear wave splitting) were measured on eight cores samples from the Kola superdeep well and on eight samples collected ...
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(2001)We model the pressure distribution around cylindrical objects in simple shear deformation using the finite element method in two dimensions and present an analytical solution for a special case. Parameter space is explored ...
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(2004)At basaltic volcanoes, the sources of long-period and very-long-period seismicity and acoustic signals are frequently described in terms of fluid dynamic processes, in particular the formation and ascent of gas slugs within ...
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(2003)The effect of pressure on melt viscosity was investigated in the system NaAlSi3O8-CaMgSi2O6 (Ab-Di) at ressures from 0.1 to 400 MPa using a parallel plate viscometer. The new measurements in the high viscosity range of ...
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(2005)OH stretching vibration modes for F-rich natural topaz (F-topaz) and for fully hydrated topaz (topaz-OH) synthesized at high pressure, were observed using IR and Raman spectroscopies at pressures up to 30.4 GPa and 17.3 ...
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(2003)Grüneisen’s parameters are central to studies of Earth’s interior because these link elastic data to thermodynamic properties through the equation of state and can be measured using either microscopic or macroscopic ...
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(2002)The solubility of Ti- and P-rich accessory minerals has been examined as a function of pressure and K2O/Na2O ratio in two series of highly evolved silicate systems. These systems correspond to (a) alkaline, varying from ...
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(2002)The solubility of Ti- and P-rich accessory minerals has been examined as a function of pressure and K2O/Na2O ratio in two series of highly evolved silicate systems. These systems correspond to (a) alkaline, varying from ...
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(1987)Data accumulated in recent years make it possible to compare two components of processes at depth, namely thermal expansion and lithostatic compression, or, strictly speaking, thermal and pressure-induced deformations or ...
Now showing items 9506-9525 of 21936