@article{hillson_caulobacter_2007,
	title = {Caulobacter crescentus as a whole-cell uranium biosensor},
	volume = {73},
	issn = {1098-5336},
	url = {http://www.ncbi.nlm.nih.gov/pubmed/17905881},
	doi = {10.1128/AEM.01566-07},
	abstract = {We engineered a strain of the bacterium Caulobacter crescentus to fluoresce in the presence of micromolar levels of uranium at ambient temperatures when it is exposed to a hand-held UV lamp. Previous microarray experiments revealed that several Caulobacter genes are significantly upregulated in response to uranium but not in response to other heavy metals. We designated one of these genes urcA (for uranium response in caulobacter). We constructed a reporter that utilizes the urcA promoter to produce a UV-excitable green fluorescent protein in the presence of the uranyl cation, a soluble form of uranium. This reporter is specific for uranium and has little cross specificity for nitrate ({\textless}400 microM), lead ({\textless}150 microM), cadmium ({\textless}48 microM), or chromium ({\textless}41.6 microM). The uranium reporter construct was effective for discriminating contaminated groundwater samples (4.2 microM uranium) from uncontaminated groundwater samples ({\textless}0.1 microM uranium) collected at the Oak Ridge Field Research Center. In contrast to other uranium detection methodologies, the Caulobacter reporter strain can provide on-demand usability in the field; it requires minimal sample processing and no equipment other than a hand-held UV lamp, and it may be sprayed directly on soil, groundwater, or industrial surfaces.},
	number = {23},
	urldate = {2009-09-30TZ},
	journal = {Applied and Environmental Microbiology},
	author = {Hillson, Nathan J and Hu, Ping and Andersen, Gary L and Shapiro, Lucy},
	month = dec,
	year = {2007},
	pmid = {17905881},
	keywords = {Biosensing Techniques, Cadmium, Caulobacter crescentus, Chromium, Gene Expression Regulation, Bacterial, Genes, Bacterial, Green Fluorescent Proteins, Lead, Nitrates, Promoter Regions, Genetic, Recombinant Fusion Proteins, Ultraviolet Rays, Uranium, Water Pollutants, Radioactive},
	pages = {7615--7621}
}

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Previous microarray experiments revealed that several Caulobacter genes are significantly upregulated in response to uranium but not in response to other heavy metals. We designated one of these genes urcA (for uranium response in caulobacter). We constructed a reporter that utilizes the urcA promoter to produce a UV-excitable green fluorescent protein in the presence of the uranyl cation, a soluble form of uranium. This reporter is specific for uranium and has little cross specificity for nitrate (\\textless400 microM), lead (\\textless150 microM), cadmium (\\textless48 microM), or chromium (\\textless41.6 microM). The uranium reporter construct was effective for discriminating contaminated groundwater samples (4.2 microM uranium) from uncontaminated groundwater samples (\\textless0.1 microM uranium) collected at the Oak Ridge Field Research Center. In contrast to other uranium detection methodologies, the Caulobacter reporter strain can provide on-demand usability in the field; it requires minimal sample processing and no equipment other than a hand-held UV lamp, and it may be sprayed directly on soil, groundwater, or industrial surfaces.","number":"23","urldate":"2009-09-30TZ","journal":"Applied and Environmental Microbiology","author":[{"propositions":[],"lastnames":["Hillson"],"firstnames":["Nathan","J"],"suffixes":[]},{"propositions":[],"lastnames":["Hu"],"firstnames":["Ping"],"suffixes":[]},{"propositions":[],"lastnames":["Andersen"],"firstnames":["Gary","L"],"suffixes":[]},{"propositions":[],"lastnames":["Shapiro"],"firstnames":["Lucy"],"suffixes":[]}],"month":"December","year":"2007","pmid":"17905881","keywords":"Biosensing Techniques, Cadmium, Caulobacter crescentus, Chromium, Gene Expression Regulation, Bacterial, Genes, Bacterial, Green Fluorescent Proteins, Lead, Nitrates, Promoter Regions, Genetic, Recombinant Fusion Proteins, Ultraviolet Rays, Uranium, Water Pollutants, Radioactive","pages":"7615--7621","bibtex":"@article{hillson_caulobacter_2007,\n\ttitle = {Caulobacter crescentus as a whole-cell uranium biosensor},\n\tvolume = {73},\n\tissn = {1098-5336},\n\turl = {http://www.ncbi.nlm.nih.gov/pubmed/17905881},\n\tdoi = {10.1128/AEM.01566-07},\n\tabstract = {We engineered a strain of the bacterium Caulobacter crescentus to fluoresce in the presence of micromolar levels of uranium at ambient temperatures when it is exposed to a hand-held UV lamp. Previous microarray experiments revealed that several Caulobacter genes are significantly upregulated in response to uranium but not in response to other heavy metals. We designated one of these genes urcA (for uranium response in caulobacter). We constructed a reporter that utilizes the urcA promoter to produce a UV-excitable green fluorescent protein in the presence of the uranyl cation, a soluble form of uranium. This reporter is specific for uranium and has little cross specificity for nitrate ({\\textless}400 microM), lead ({\\textless}150 microM), cadmium ({\\textless}48 microM), or chromium ({\\textless}41.6 microM). The uranium reporter construct was effective for discriminating contaminated groundwater samples (4.2 microM uranium) from uncontaminated groundwater samples ({\\textless}0.1 microM uranium) collected at the Oak Ridge Field Research Center. 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