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Based on previously published hydroponic plant, planktonic bacterial, and soil microbial community research, manufactured nanomaterial (MNM) environmental buildup could profoundly alter soil-based food crop quality and yield. However, thus far, no single study has at once examined the full implications, as no studies have involved growing plants to full(More)
Analysis of microbial community structure in complex environmental samples using nucleic acid techniques requires efficient unbiased DNA extraction procedures; however, humic acids and other contaminants complicate the isolation of PCR-amplifiable DNA from compost and other organic-rich samples. In this study, combinations of DNA extraction and purification(More)
The sewage-associated real-time quantitative PCR (qPCR) assays BacHum and HF183 SYBR were compared for specificity against local fecal sources. Both assays were equally sensitive to sewage, but BacHum showed substantially more false-positive results for cat, dog, gull, and raccoon feces.
We quantified the effects of matric and solute water potential on toluene biodegradation by Pseudomonas putida mt-2, a bacterial strain originally isolated from soil. Across the matric potential range of 0 to -1.5 MPa, growth rates were maximal for P. putida at -0.25 MPa and further reductions in the matric potential resulted in concomitant reductions in(More)
Soil drying and rewetting represents a common physiological stress for the microbial communities residing in surface soils. A drying-rewetting cycle may induce lysis in a significant proportion of the microbial biomass and, for a number of reasons, may directly or indirectly influence microbial community composition. Few studies have explicitly examined the(More)
For nanotechnology to meet its potential as a game-changing and sustainable technology, it is important to ensure that the engineered nanomaterials and nanoenabled products that gain entry to the marketplace are safe and effective. Tools and methods are needed for regulatory purposes to allow rapid material categorization according to human health and(More)
Advances in the study of the environmental fate, transport, and ecotoxicological effects of engineered nanomaterials (ENMs) have been hampered by a lack of adequate techniques for the detection and quantification of ENMs at environmentally relevant concentrations in complex media. Analysis of ENMs differs from traditional chemical analysis because both(More)
Coastal urbanized areas in Southern California experience frequent beach water quality warnings in summer due to high concentrations of fecal indicator bacteria (FIB). Remediation can be difficult, as sources are often unknown. During two summers, we sampled three urbanized watersheds in Santa Barbara, CA at sites with historically high FIB concentrations(More)
In situ chemical oxidation with permanganate has become an accepted remedial treatment for groundwater contaminated with chlorinated solvents. This study focuses on the immediate and short-term effects of sodium permanganate (NaMnO4) on the indigenous subsurface microbial community composition in groundwater impacted by trichloroethylene (TCE). Planktonic(More)
Salt marshes are important ecosystems whose plant and microbial communities can alter terrestrially derived pollutants prior to coastal water discharge. However, knowledge regarding relationships between anthropogenic pollutant levels and salt marsh microbial communities is limited, and salt marshes on the West Coast of the United States are rarely(More)