@article{bucci_showers_genna_levine_2009, title={Stable oxygen and carbon isotope profiles in an invasive bivalve (Corbicula fluminea) in North Carolina watersheds}, volume={73}, ISSN={0016-7037}, url={http://dx.doi.org/10.1016/j.gca.2009.03.023}, DOI={10.1016/j.gca.2009.03.023}, abstractNote={The modern invasive bivalve Corbicula fluminea was collected in 2006 from three sites with different land uses located in a North Carolina River Basin. The primary objective was to describe the δ18O and δ13C profiles of C. fluminea shells under various land use conditions. An additional aim was to evaluate whether growth patterns of C. fluminea form seasonally. Annual shell growth patterns were measured from the umbo to the margin and co-varied with estimates of ambient water temperature, corresponding to seasonal variation. The C. fluminea growth patterns as translucent bands (slower growth) appeared to form during winter months and opaque bands (rapid growth) formed during summer. A mixed model analysis (ANOVA) showed a significant site level effect of δ18O and δ13C profiles examined among sites (F = 17.1; p = 0.003). A second model showed a borderline significant site effect among profiles with variability more pronounced at the urban site, Crabtree Creek (p = 0.085). Previous habitat assessment ratings and water chemistry measurements suggested that the urban site was more impacted by storm water runoff. Understanding δ18O and δ13CSHELL profiles and shell growth patterns of the invasive bivalve (C. fluminea) may help establish a framework for using these animals as biomonitors to record water temperature and nutrient pollution.}, number={11}, journal={Geochimica et Cosmochimica Acta}, publisher={Elsevier BV}, author={Bucci, John P. and Showers, William J. and Genna, Bernie and Levine, Jay F.}, year={2009}, month={Jun}, pages={3234–3247} }
 @article{showers_genna_mcdade_bolich_fountain_2008, title={Nitrate contamination in groundwater on an urbanized dairy farm}, volume={42}, ISSN={["0013-936X"]}, DOI={10.1021/es071551t}, abstractNote={Urbanization of rural farmland is a pervasive trend around the globe, and maintaining and protecting adequate water supplies in suburban areas is a growing problem. Identification of the sources of groundwater contamination in urbanized areas is problematic, but will become important in areas of rapid population growth and development. The isotopic composition of NO3 (delta15N(NO3) and delta18O NO3), NH4 (delta15N(NH4)), groundwater (delta2H(wt) and delta18O(wt)) and chloride/bromide ratios were used to determine the source of nitrate contamination in drinking water wells in a housing development that was built on the site of a dairy farm in the North Carolina Piedmont, U.S. The delta15N(NO3) and delta18O NO3 compositions imply that elevated nitrate levels at this site in drinking well water are the result of waste contamination, and that denitrification has not significantly attenuated the groundwater nitrate concentrations. delta15N(NO3) and delta18O(NO3) compositions in groundwater could not differentiate between septic effluent and animal waste contamination. Chloride/ bromide ratios in the most contaminated drinking water wells were similar to ratios found in animal waste application fields, and were higher than Cl/Br ratios observed in septic drain fields in the area. delta18O(wt) was depleted near the site of a buried waste lagoon without an accompanying shift in delta2H(wt) suggesting water oxygen exchange with CO2. This water-CO2 exchange resulted from the reduction of buried lagoon organic matter, and oxidation of the released gases in aerobic soils. delta18O(wt) is not depleted in the contaminated drinking water wells, indicating that the buried dairy lagoon is not a source of waste contamination. The isotope and Cl/Br ratios indicate that nitrate contamination in these drinking wells are not from septic systems, but are the result of animal waste leached from pastures into groundwater during 35 years of dairy operations which did not violate any existing regulations. Statutes need to be enacted to protect the health of the homeowners that require well water to be tested prior to the sale of homes built on urbanized farmland.}, number={13}, journal={ENVIRONMENTAL SCIENCE & TECHNOLOGY}, author={Showers, William J. and Genna, Bernard and McDade, Timothy and Bolich, Rick and Fountain, John C.}, year={2008}, month={Jul}, pages={4683–4688} }
 @article{michalski_kasem_rech_adieu_showers_genna_thiemens_2008, title={Uncertainties in the oxygen isotopic composition of barium sulfate induced by coprecipitation of nitrate}, volume={22}, ISSN={["1097-0231"]}, DOI={10.1002/rcm.3687}, abstractNote={Abstract}, number={19}, journal={RAPID COMMUNICATIONS IN MASS SPECTROMETRY}, author={Michalski, Greg and Kasem, Michelle and Rech, Jason A. and Adieu, Sabine and Showers, William S. and Genna, Bernie and Thiemens, Mark}, year={2008}, month={Oct}, pages={2971–2976} }
 @article{bucci_showers_rebach_demaster_genna_2007, title={Stable isotope analyses (delta N-15 and delta C-13) of the trophic relationships of Callinectes sapidus in two north Carolina estuaries}, volume={30}, ISSN={["1559-2731"]}, DOI={10.1007/BF02841395}, number={6}, journal={ESTUARIES AND COASTS}, author={Bucci, J. P. and Showers, W. J. and Rebach, S. and DeMaster, D. and Genna, B.}, year={2007}, month={Dec}, pages={1049–1059} }
 @article{showers_barrick_genna_2002, title={Isotopic analysis of dinosaur bones}, volume={74}, ISSN={["0003-2700"]}, DOI={10.1021/ac021968b}, abstractNote={ADVERTISEMENT RETURN TO ISSUEPREVFeaturesNEXTPeer Reviewed: Isotopic Analysis of Dinosaur BonesA new pyrolysis technique provides direct evidence that some dinosaurs were warm-blooded.William J. Showers, Reese Barrick, and Bernard GennaCite this: Anal. Chem. 2002, 74, 5, 142 A–150 APublication Date (Web):March 1, 2002Publication History Published online1 March 2002Published inissue 1 March 2002https://pubs.acs.org/doi/10.1021/ac021968bhttps://doi.org/10.1021/ac021968bnewsACS Publications. This publication is available under these Terms of Use. Request reuse permissions This publication is free to access through this site. Learn MoreArticle Views1962Altmetric-Citations8LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InRedditEmail PDF (10 MB) Get e-Alertsclose SUBJECTS:Anatomy Get e-Alerts}, number={5}, journal={ANALYTICAL CHEMISTRY}, author={Showers, WJ and Barrick, R and Genna, B}, year={2002}, month={Mar}, pages={142A–150A} }
 @misc{showers_genna_2002, title={Reply to comments on 'Isotopic analysis of dinosaur bones'}, volume={74}, DOI={10.1021/ac022060o}, abstractNote={ADVERTISEMENT RETURN TO ISSUEPREVDepartmentsNEXTLetters to the Editor: Reply to Comments on "Isotopic Analysis of Dinosaur Bones"William J. Showers and Bernard GennaCite this: Anal. Chem. 2002, 74, 13, 352 APublication Date (Web):July 1, 2002Publication History Published online1 July 2002Published inissue 1 July 2002https://pubs.acs.org/doi/10.1021/ac022060ohttps://doi.org/10.1021/ac022060onewsACS Publications. This publication is available under these Terms of Use. Request reuse permissions This publication is free to access through this site. Learn MoreArticle Views180Altmetric-Citations1LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InRedditEmail PDF (30 KB) Get e-AlertscloseSupporting Info (2)»Supporting Information Supporting Information SUBJECTS:Anatomy Get e-Alerts}, number={13}, journal={Analytical Chemistry}, author={Showers, W. J. and Genna, B.}, year={2002}, pages={352A} }