Herbert Volk

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Microbial diversity within formation water and oil from two compartments in Bokor oil reservoir from a Malaysian petroleum oil field was examined. A total of 1,056 16S rRNA gene clones were screened from each location by amplified ribosomal DNA restriction analysis. All samples were dominated by clones affiliated with Marinobacter, some novel(More)
Improved testing and remediation procedures for sites contaminated with petroleum hydrocarbons are a priority in remote cold regions such as Antarctica, where costs are higher and remediation times are longer. Isoprenoid/n-alkane ratios are commonly used to determine the extent of biodegradation at low levels but are not useful once the n-alkanes have been(More)
Extraction of genome sequences from metagenomic data is crucial for reconstructing the metabolism of microbial communities that cannot be mimicked in the laboratory. A complete Methanococcus maripaludis genome was generated from metagenomic data derived from a thermophilic subsurface oil reservoir. M. maripaludis is a hydrogenotrophic methanogenic species(More)
The surface characteristics of various carbon and graphite fibers and the Interfaclal region between fibers and resin In composites were Investlgaced by using electron microscopy, electron diffraction and Raman spectroscopy. The latter technique permits differentiation between graphite fibers of different origin. Graphite fiber composites were prepared by(More)
Microbial degradation of petroleum is a worldwide issue, which causes physico-chemical changes in its compounds, diminishing its commercial value. Biosurfactants are chemically diverse molecules that can be produced by several microorganisms and can enable microbial access to hydrocarbons. In order to investigate both microbial activities, function-driven(More)
The retention time shown in Figure 1 is incorrect. In this case, the gas chromatograph was run using constant pressure conditions (25 psi) rather than with the constant flow conditions (1.2 mL/min) detailed in the methods section. As a result, the peaks eluted around 15 min later. Figure 2 shows the correct retention times for the constant flow method(More)
The manipulation of microbes within oil reservoirs has been the subject of a number of studies. The aims of these studies have included alteration of oil characteristics, improvement in recovery of oil and suppression of microbes that produce H(2)S. Understanding microbial communities and their microbial responses is important in predicting the outcome of(More)
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