Microbially mediated reduction and immobilization of U(VI) to U(TV) plays a role in both natural ... more Microbially mediated reduction and immobilization of U(VI) to U(TV) plays a role in both natural attenuation and accelerated bioremediation of uranium contaminated sites. To realize bioremediation potential and accurately predict natural attenuation, it is important to first understand the microbial diversity of such sites. In this paper, the distribution of sulfate-reducing bacteria (SRB) in contaminated groundwater associated with a uranium
Eos, Transactions American Geophysical Union, 2001
Microbial transport in the subsurface environment has been of interest for decades due to concern... more Microbial transport in the subsurface environment has been of interest for decades due to concerns about contamination of water supplies by pathogenic bacteria or viruses. More recently, research has demonstrated that many bacteria can beneficially serve to degrade ...
Eos, Transactions American Geophysical Union, 2006
Gas hydrate is a solid compound mainlycomprised of methane and water that is stableunder low temp... more Gas hydrate is a solid compound mainlycomprised of methane and water that is stableunder low temperature and high pressureconditions. Usually found in offshore environmentswith water depths exceeding about500 meters and in arctic regions associatedwith permafrost, gas hydrates form an efficientstorage system for natural gas. Hence,they may represent an important futureenergy resource [e.g.,Kvenvolden,1988]. Gashydrates also form a natural geo-hazard, andmay play
Hexavalent Chromium is a widespread contaminant found in soil, sediment, and groundwater. In orde... more Hexavalent Chromium is a widespread contaminant found in soil, sediment, and groundwater. In order to stimulate microbially-mediated reduction of Cr(VI), a poly-lactate compound (HRC) was injected into the Chromium-contaminated aquifer at the Hanford (WA) 100H ...
A previously unreported series of di- and tri-methylated fatty acids, as well as saturated and mo... more A previously unreported series of di- and tri-methylated fatty acids, as well as saturated and monounsaturated diacids were identified in polar lipids isolated from environmental subsurface sediment samples. Mechanisms are proposed for their formation, but their origin and role in cell membranes remains unknown.
Journal of Volcanology and Geothermal Research, 1989
Thermal contraction joints form in the upper and lower solidifying crusts of basaltic lava flows ... more Thermal contraction joints form in the upper and lower solidifying crusts of basaltic lava flows and grow toward the interior as the crusts thicken. Lava flows are thus divided by vertical joints that, by changes in joint spacing and form, define horizontal intraflow layers known as ...
Field biostimulation experiments at the US Department of Energy'... more Field biostimulation experiments at the US Department of Energy's Integrated Field Research Challenge (IFRC) site in Rifle, Colorado, have demonstrated that uranium concentrations in groundwater can be decreased to levels below the US Environmental Protection Agency's (EPA) ...
Stimulated by an acetate-amendment field experiment conducted in 2007, anaerobic microbial popula... more Stimulated by an acetate-amendment field experiment conducted in 2007, anaerobic microbial populations in the aquifer at the Rifle Integrated Field Research Challenge site in Colorado reduced mobile U(VI) to insoluble U(IV). During this experiment, planktonic biomass was sampled at various time points to quantitatively evaluate proteomes. In 2008, an acetate-amended field experiment was again conducted in a similar manner to the 2007 experiment. As there was no comprehensive metagenome sequence available for use in proteomics analysis, we systematically evaluated 12 different organism genome sequences to generate sets of aggregate genomes, or "pseudo-metagenomes", for supplying relative quantitative peptide and protein identifications. Proteomics results support previous observations of the dominance of Geobacteraceae during biostimulation using acetate as sole electron donor, and revealed a shift from an early stage of iron reduction to a late stage of iron reduction. Additionally, a shift from iron reduction to sulfate reduction was indicated by changes in the contribution of proteome information contributed by different organism genome sequences within the aggregate set. In addition, the comparison of proteome measurements made between the 2007 field experiment and 2008 field experiment revealed differences in proteome profiles. These differences may be the result of alterations in abundance and population structure within the planktonic biomass samples collected for analysis.
... Resistivity-at-bit (RAB) 3.5. Other geophysical logs 4. Estimating the average gas hydrate co... more ... Resistivity-at-bit (RAB) 3.5. Other geophysical logs 4. Estimating the average gas hydrate content of cores from IR data 5. Small-scale heterogeneity in gas hydrate distribution 6. Regional variations in gas hydrate distribution 6.1. Southern Hydrate Ridge flanks 6.2. ...
Microbially mediated reduction and immobilization of U(VI) to U(TV) plays a role in both natural ... more Microbially mediated reduction and immobilization of U(VI) to U(TV) plays a role in both natural attenuation and accelerated bioremediation of uranium contaminated sites. To realize bioremediation potential and accurately predict natural attenuation, it is important to first understand the microbial diversity of such sites. In this paper, the distribution of sulfate-reducing bacteria (SRB) in contaminated groundwater associated with a uranium
Eos, Transactions American Geophysical Union, 2001
Microbial transport in the subsurface environment has been of interest for decades due to concern... more Microbial transport in the subsurface environment has been of interest for decades due to concerns about contamination of water supplies by pathogenic bacteria or viruses. More recently, research has demonstrated that many bacteria can beneficially serve to degrade ...
Eos, Transactions American Geophysical Union, 2006
Gas hydrate is a solid compound mainlycomprised of methane and water that is stableunder low temp... more Gas hydrate is a solid compound mainlycomprised of methane and water that is stableunder low temperature and high pressureconditions. Usually found in offshore environmentswith water depths exceeding about500 meters and in arctic regions associatedwith permafrost, gas hydrates form an efficientstorage system for natural gas. Hence,they may represent an important futureenergy resource [e.g.,Kvenvolden,1988]. Gashydrates also form a natural geo-hazard, andmay play
Hexavalent Chromium is a widespread contaminant found in soil, sediment, and groundwater. In orde... more Hexavalent Chromium is a widespread contaminant found in soil, sediment, and groundwater. In order to stimulate microbially-mediated reduction of Cr(VI), a poly-lactate compound (HRC) was injected into the Chromium-contaminated aquifer at the Hanford (WA) 100H ...
A previously unreported series of di- and tri-methylated fatty acids, as well as saturated and mo... more A previously unreported series of di- and tri-methylated fatty acids, as well as saturated and monounsaturated diacids were identified in polar lipids isolated from environmental subsurface sediment samples. Mechanisms are proposed for their formation, but their origin and role in cell membranes remains unknown.
Journal of Volcanology and Geothermal Research, 1989
Thermal contraction joints form in the upper and lower solidifying crusts of basaltic lava flows ... more Thermal contraction joints form in the upper and lower solidifying crusts of basaltic lava flows and grow toward the interior as the crusts thicken. Lava flows are thus divided by vertical joints that, by changes in joint spacing and form, define horizontal intraflow layers known as ...
Field biostimulation experiments at the US Department of Energy'... more Field biostimulation experiments at the US Department of Energy's Integrated Field Research Challenge (IFRC) site in Rifle, Colorado, have demonstrated that uranium concentrations in groundwater can be decreased to levels below the US Environmental Protection Agency's (EPA) ...
Stimulated by an acetate-amendment field experiment conducted in 2007, anaerobic microbial popula... more Stimulated by an acetate-amendment field experiment conducted in 2007, anaerobic microbial populations in the aquifer at the Rifle Integrated Field Research Challenge site in Colorado reduced mobile U(VI) to insoluble U(IV). During this experiment, planktonic biomass was sampled at various time points to quantitatively evaluate proteomes. In 2008, an acetate-amended field experiment was again conducted in a similar manner to the 2007 experiment. As there was no comprehensive metagenome sequence available for use in proteomics analysis, we systematically evaluated 12 different organism genome sequences to generate sets of aggregate genomes, or "pseudo-metagenomes", for supplying relative quantitative peptide and protein identifications. Proteomics results support previous observations of the dominance of Geobacteraceae during biostimulation using acetate as sole electron donor, and revealed a shift from an early stage of iron reduction to a late stage of iron reduction. Additionally, a shift from iron reduction to sulfate reduction was indicated by changes in the contribution of proteome information contributed by different organism genome sequences within the aggregate set. In addition, the comparison of proteome measurements made between the 2007 field experiment and 2008 field experiment revealed differences in proteome profiles. These differences may be the result of alterations in abundance and population structure within the planktonic biomass samples collected for analysis.
... Resistivity-at-bit (RAB) 3.5. Other geophysical logs 4. Estimating the average gas hydrate co... more ... Resistivity-at-bit (RAB) 3.5. Other geophysical logs 4. Estimating the average gas hydrate content of cores from IR data 5. Small-scale heterogeneity in gas hydrate distribution 6. Regional variations in gas hydrate distribution 6.1. Southern Hydrate Ridge flanks 6.2. ...
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Papers by Philip Long