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Records 1 to
25
of 32 records from author Shawn Siefring
2022
Keely, S., N. Brinkman, E. Wheaton, M. Jahne, S. Siefring, M. Varma, R. Hill, S. Leibowitz, R. Martin, J. Garland, AND Rich Haugland. Geospatial Patterns of Antimicrobial Resistance Genes in the US EPA National Rivers and Streams Assessment Survey. ENVIRONMENTAL SCIENCE & TECHNOLOGY. American Chemical Society, Washington, DC, 56(21):14960–14971, (2022). https://doi.org/10.1021/acs.est.2c00813
2021
Keely, S., N. Brinkman, E. Wheaton, M. Jahne, S. Siefring, M. Varma, Ryan A Hill, S. Leibowitz, R. Martin, J. Garland, AND Rich Haugland. Large-scale Patterns of Antimicrobial Resistance Genes and Fecal Indicator Bacteria in United States Rivers and Streams. 2021 US EPA National Recreational Water Quality Workshop, Virtual, April 06 - 08, 2021.
2019
Briggs, S., M. Sivaganesan, O. Shanks, R. Haugland, S. Siefring, M. Varma, K. Oshima, A. Dufour, S. Nappier, AND B. Schnitker. Derivation of the equivalent qPCR value for Escherichia coli to existing culture-based water quality standards for monitoring beaches in Michigan. IWA 20th International Symposium on Health Related Water Microbiology, Vienna, AUSTRIA, September 15 - 20, 2019.
Aw, T., Mano Sivaganesan, S. Briggs, E. Dreelin, A. Aslan, S. Dorevitch, A. Shrestha, N. Isaacs, J. Kinzelman, G. Kleinheinz, R. Noble, R. Rediske, B. Scull, S. Rosenberg, B. Weberman, T. Sivy, B. Southwell, S. Siefring, K. Oshima, AND Rich Haugland. Evaluation of multiple laboratory performance and variability in analysis of recreational freshwaters by a rapid Escherichia coli qPCR method (Draft Method C). WATER RESEARCH. Elsevier Science Ltd, New York, NY, 156:465-474, (2019). https://doi.org/10.1016/j.watres.2019.03.014
Sivaganesan, Mano, T. Aw, S. Briggs, E. Dreelin, A. Aslan, S. Dorevitch, A. Shrestha, N. Isaacs, J. Kinzelman, G. Kleinheinz, R. Noble, R. Rediske, B. Scull, S. Rosenberg, B. Weberman, T. Sivy, B. Southwell, S. Siefring, K. Oshima, AND Rich Haugland. Standardized data quality acceptance criteria for a rapid Escherichia coli qPCR method (Draft Method C) for water quality monitoring at recreational beaches. WATER RESEARCH. Elsevier Science Ltd, New York, NY, 156:456-464, (2019). https://doi.org/10.1016/j.watres.2019.03.011
2018
Haugland, Rich, S. Siefring, E. Anneken, M. Varma, S. Keely, R. Mitchell, AND S. Lehmann. Low Frequencies of Interference to EPA Quantitative Polymerase Chain Reaction (qPCR) Methods for Microbial Water Quality Monitoring in U.S. Rivers and Streams and Coastal Waters. 2018 UNC Water Microbiology Conference, Chapel Hill, NC, May 22 - 24, 2018.
Sivaganesan, Mano, M. Varma, S. Siefring, AND Rich Haugland. Quantification of plasmid DNA standards for U.S. EPA fecal indicator bacteria qPCR methods by droplet digital PCR analysis. JOURNAL OF MICROBIOLOGICAL METHODS. Elsevier Science Ltd, New York, NY, 152:135-142, (2018). https://doi.org/10.1016/j.mimet.2018.07.005
2015
Paar, J., M. Doolittle, M. Varma, S. Siefring, K. Oshima, AND Rich Haugland. Development and evaluation of a culture-independent method for source determination of fecal wastes in surface and storm waters using reverse transcriptase-PCR detection of FRNA coliphage genogroup gene sequences. JOURNAL OF MICROBIOLOGICAL METHODS. Elsevier Science Ltd, New York, NY, 112(2):28-35, (2015).
2014
Sivaganesan, Mano, S. Siefring, M. Varma, AND Rich Haugland. Comparison of Enterococcus quantitative polymerase chain reaction analysis results from midwest U.S. river samples using EPA Method 1611 and Method 1609 PCR reagents. JOURNAL OF MICROBIOLOGICAL METHODS. Elsevier Science Ltd, New York, NY, 101(6):9-17, (2014).
Haugland, Rich, S. Siefring, M. Varma, A. Dufour, K. Brenner, Tim Wade, E. Sams, S. Cochran, S. Braun, AND Mano Sivaganesan. Standardization of enterococci density estimates by EPA qPCR methods and comparison of beach action value exceedances in river waters with culture methods. JOURNAL OF MICROBIOLOGICAL METHODS. Elsevier Science Ltd, New York, NY, 105(7):59-66, (2014).
2012
Converse, R., J. Kinzelman, E. Sams, E. Hudgens, A. Dufour, H. Ryu, J. Santo-Domingo, C. Kelty, O. Shanks, S. Siefring, R. Haugland, AND Tim Wade. Dramatic Improvements in Beach Water Quality Following Gull Removal. ENVIRONMENTAL SCIENCE AND TECHNOLOGY. John Wiley & Sons, Ltd., Indianapolis, IN, 48(18):10206-13, (2012).
HAUGLAND, R. A., S. SIEFRING, J. Lavender, AND M. VARMA. Influences of sample interference and interference controls on quantification of enterococci fecal indicator bacteria in surface water samples by the qPCR method. WATER RESEARCH. Elsevier Science Ltd, New York, NY, 46(18):5989-6001, (2012).
2011
CHERN, E. C., S. SIEFRING, J. PAAR, M. Doolittle, AND R. A. HAUGLAND. Comparison of quantitative PCR assays for Escherichia coli targeting ribosomal RNA and single copy genes. Letters in Applied Microbiology. Blackwell Publishing, Malden, MA, 52(3):298-306, (2012).
SIVAGANESAN, M., S. SIEFRING, M. VARMA, AND R. A. HAUGLAND. MPN estimation of qPCR target sequence recoveries from whole cell calibrator samples. JOURNAL OF MICROBIOLOGICAL METHODS. Elsevier Science Ltd, New York, NY, 87(3):3235-3249, (2011).
2008
SIEFRING, S., R. A. HAUGLAND, AND L. J. WYMER. Evaluation of Commercial Cell Preparations as Sources of Calibration Standards for Real-Time qPCR Analysis of Enterococci in Recreational Waters. Presented at Great Lakes Beaches Association Annual Meeting, Porter, IN, September 15 - 17, 2008.
HAUGLAND, R. A., S. SIEFRING, M. VARMA, AND L. J. WYMER. Laboratory Evaluations of the Enterococcus qPCR Method for Recreational Water Quality Testing: Method Performance and Sources of Uncertainty in Quantitative Measurements. Presented at 108th General Meeting of the American Society for Microbiology, Boston, MA, June 01 - 05, 2008.
2007
SIEFRING, S., E. ATIKOVIC, R. A. HAUGLAND, M. SIVAGANESAN, AND O. C. SHANKS. INTERNAL AMPLIFICATION CONTROL FOR USE IN QUANTITATIVE POLYMERASE CHAIN REACTION FECAL INDICATOR BACTERIA ASSAYS. Presented at OHIO BRANCH OF THE AMERICAN SOCIETY FOR MICROBIOLOGY, Canton, OH, April 13 - 14, 2007.
SIEFRING, S., E. ATIKOVIC, R. A. HAUGLAND, M. SIVAGANESAN, AND O. C. SHANKS. INTERNAL AMPLIFICATION CONTROL FOR USE IN QUANTITATIVE POLYMERASE CHAIN REACTION FECAL INDICATOR BACTERIA ASSAYS. Presented at Ohio Branch of the American Society for Microbiology Annual Meeting, Canton, OH, April 13 - 14, 2007.
2006
HAUGLAND, R. A., S. SIEFRING, M. VARMA, E. ATIKOVIC, AND L. J. WYMER. COMPARISON OF REAL-TIME PCR FECAL BACTERIA MEASUREMENTS IN RECREATIONAL WATERS USING DIFFERENT INSTRUMENTS AND REAGENT SYSTEMS. Presented at 106th General Meeting of the American Society for Microbiology, Orlando, FL, May 21 - 25, 2006.
HAUGLAND, R. A., S. SIEFRING, M. VARMA, E. ATIKOVIC, K. P. BRENNER, A. P. DUFOUR, AND L. J. WYMER. EVALUATION OF MATRIX EFFECTS FROM NATIONWIDE INLAND SURFACE WATERS ON QUANTITATION POLYMERASE CHAIN REACTION ANALYSIS FOR FECAL INDICATOR BACTERIA. Presented at National Beaches Conference, Niagra Falls, NY, October 11 - 13, 2006.
VARMA, M., S. SIEFRING, E. ATIKOVIC, L. J. WYMER, AND R. A. HAUGHLAND. MONITORING FECAL INDICATOR BACTERIA WITH ALTERNATIVE REAL-TIME PCR INSTRUMENTS TO ASSESS HEALTH RISKS ASSOCIATED WITH RECREATIONAL WATER USE. Presented at 2006 EPA Science Forum, Washington, DC, May 16 - 18, 2006.
BRENNER, K. P., R. L. CALDERON, A. P. DUFOUR, R. A. HAUGLAND, E. A. SAMS, T. J. WADE, AND S. SIEFRING. RAPID HEALTH-BASED METHOD FOR MEASURING MICROBIAL INDICATORS OF RECREATIONAL WATER QUALITY - 2006 EPA SCIENCE FORUM. Presented at 2006 EPA Science Forum, Washington, DC, May 16 - 18, 2006.
2005
Haugland, R A., S D. Siefring, L J. Wymer, K Brenner, AND A P. Dufour. COMPARISON OF ENTEROCOCCUS MEASUREMENTS IN FRESHWATER AT TWO RECREATIONAL BEACHES BY QUANTITATIVE POLYMERASE CHAIN REACTION AND MEMBRANE FILER CULTURE ANALYSIS. WATER RESEARCH 39(4):559-568, (2005).
SIEFRING, S., L. J. WYMER, AND R. A. HAUGLAND. NEW TARGET AND CONTROL ASSAYS FOR QUANTITATIVE POLYMERASE CHAIN REACTION (QPCR) ANALYSIS OF ENTEROCOCCI IN WATER. Presented at American Society for Microbiology General Meeting, Atlanta, GA, June 05 - 09, 2005.
2004
Haugland, R A., S D. Siefring, L J. Wymer, K Brenner, AND A P. Dufour. COMPARISON OF ENTEROCCOCUS DENSITIES DETERMINED BY CULTURE AND QPCR ANALYSES IN WATER SAMPLES FROM TWO RECREATION BEACHES. Presented at New England Association of Environmental Biologists (NEAEB), Hancock, MA, March 17-19, 2004.