Donna Francy (Former Employee)
Science and Products
Filter Total Items: 46
Use of Spatial Sampling and Microbial Source-Tracking Tools for Understanding Fecal Contamination at Two Lake Erie Beaches Use of Spatial Sampling and Microbial Source-Tracking Tools for Understanding Fecal Contamination at Two Lake Erie Beaches
Source-tracking tools were used to identify potential sources of fecal contamination at two Lake Erie bathing beaches: an urban beach (Edgewater in Cleveland, Ohio) and a beach in a small city (Lakeshore in Ashtabula, Ohio). These tools included identifying spatial patterns of Escherichia coli (E. coli) concentrations in each area, determining weather patterns that caused elevated E...
Authors
Donna S. Francy, Erin E. Bertke, Dennis P. Finnegan, Christopher M. Kephart, Rodney A. Sheets, John Rhoades, Lester Stumpe
A spatial, multivariable approach for identifying proximate sources of Escherichia coli to Maumee Bay, Lake Erie, Ohio A spatial, multivariable approach for identifying proximate sources of Escherichia coli to Maumee Bay, Lake Erie, Ohio
No abstract available.
Authors
Donna S. Francy, Pamela Struffolino, Amie M. G. Brady, Daryl F. Dwyer
Effects of seeding procedures and water quality on recovery of Cryptosporidium oocysts from stream water by using U.S. Environmental Protection Agency method 1623 Effects of seeding procedures and water quality on recovery of Cryptosporidium oocysts from stream water by using U.S. Environmental Protection Agency method 1623
U.S. Environmental Protection Agency method 1623 is widely used to monitor source waters and drinking water supplies for Cryptosporidium oocysts. Matrix spikes, used to determine the effect of the environmental matrix on the method's recovery efficiency for the target organism, require the collection and analysis of two environmental samples, one for analysis of endemic oocysts and the...
Authors
D.S. Francy, O. D. Simmons, M.W. Ware, E.J. Granger, M.D. Sobsey, F. W. Schaefer
Environmental factors and chemical and microbiological water-quality constituents related to the presence of enteric viruses in ground water from small public water supplies in southeastern Michigan Environmental factors and chemical and microbiological water-quality constituents related to the presence of enteric viruses in ground water from small public water supplies in southeastern Michigan
A study of small public ground-water-supply wells that produce water from discontinuous sand and gravel aquifers was done from July 1999 through July 2001 in southeastern Michigan. Samples were collected to determine the occurrence of viral pathogens and microbiological indicators of fecal contamination (“indicators”), determine whether indicators are adequate predictors of the presence...
Authors
Donna S. Francy, Rebecca N. Bushon, Julie Stopar, Emma J. Luzano, G. Shay Fout
Detection of human enteric viruses in stream water with RT-PCR and cell culture Detection of human enteric viruses in stream water with RT-PCR and cell culture
A multiplex RT-PCR method was used to measure virus occurrence at five stream water sites that span a range of hydroclimatic, water-quality, and land-use characteristics. The performance of the molecular method was evaluated in comparison with traditional cell culture and Escherichia coli membrane filtration assays. The study incorporated multiple quality controls and included a control...
Authors
K. Denis-Mize, G.S. Fout, D.R. Dahling, D.S. Francy
Escherichia coli at Ohio bathing beaches—Distribution, sources, wastewater indicators, and predictive modeling Escherichia coli at Ohio bathing beaches—Distribution, sources, wastewater indicators, and predictive modeling
Results of studies during the recreational seasons of 2000 and 2001 strengthen the science that supports monitoring of our Nation's beaches. Water and sediment samples were collected and analyzed for concentrations of Escherichia coli (E. coli). Ancillary water-quality and environmental data were collected or compiled to determine their relation to E. coli concentrations. Data were...
Authors
Donna S. Francy, Amie M. Gifford, Robert A. Darner
Science and Products
Filter Total Items: 46
Use of Spatial Sampling and Microbial Source-Tracking Tools for Understanding Fecal Contamination at Two Lake Erie Beaches Use of Spatial Sampling and Microbial Source-Tracking Tools for Understanding Fecal Contamination at Two Lake Erie Beaches
Source-tracking tools were used to identify potential sources of fecal contamination at two Lake Erie bathing beaches: an urban beach (Edgewater in Cleveland, Ohio) and a beach in a small city (Lakeshore in Ashtabula, Ohio). These tools included identifying spatial patterns of Escherichia coli (E. coli) concentrations in each area, determining weather patterns that caused elevated E...
Authors
Donna S. Francy, Erin E. Bertke, Dennis P. Finnegan, Christopher M. Kephart, Rodney A. Sheets, John Rhoades, Lester Stumpe
A spatial, multivariable approach for identifying proximate sources of Escherichia coli to Maumee Bay, Lake Erie, Ohio A spatial, multivariable approach for identifying proximate sources of Escherichia coli to Maumee Bay, Lake Erie, Ohio
No abstract available.
Authors
Donna S. Francy, Pamela Struffolino, Amie M. G. Brady, Daryl F. Dwyer
Effects of seeding procedures and water quality on recovery of Cryptosporidium oocysts from stream water by using U.S. Environmental Protection Agency method 1623 Effects of seeding procedures and water quality on recovery of Cryptosporidium oocysts from stream water by using U.S. Environmental Protection Agency method 1623
U.S. Environmental Protection Agency method 1623 is widely used to monitor source waters and drinking water supplies for Cryptosporidium oocysts. Matrix spikes, used to determine the effect of the environmental matrix on the method's recovery efficiency for the target organism, require the collection and analysis of two environmental samples, one for analysis of endemic oocysts and the...
Authors
D.S. Francy, O. D. Simmons, M.W. Ware, E.J. Granger, M.D. Sobsey, F. W. Schaefer
Environmental factors and chemical and microbiological water-quality constituents related to the presence of enteric viruses in ground water from small public water supplies in southeastern Michigan Environmental factors and chemical and microbiological water-quality constituents related to the presence of enteric viruses in ground water from small public water supplies in southeastern Michigan
A study of small public ground-water-supply wells that produce water from discontinuous sand and gravel aquifers was done from July 1999 through July 2001 in southeastern Michigan. Samples were collected to determine the occurrence of viral pathogens and microbiological indicators of fecal contamination (“indicators”), determine whether indicators are adequate predictors of the presence...
Authors
Donna S. Francy, Rebecca N. Bushon, Julie Stopar, Emma J. Luzano, G. Shay Fout
Detection of human enteric viruses in stream water with RT-PCR and cell culture Detection of human enteric viruses in stream water with RT-PCR and cell culture
A multiplex RT-PCR method was used to measure virus occurrence at five stream water sites that span a range of hydroclimatic, water-quality, and land-use characteristics. The performance of the molecular method was evaluated in comparison with traditional cell culture and Escherichia coli membrane filtration assays. The study incorporated multiple quality controls and included a control...
Authors
K. Denis-Mize, G.S. Fout, D.R. Dahling, D.S. Francy
Escherichia coli at Ohio bathing beaches—Distribution, sources, wastewater indicators, and predictive modeling Escherichia coli at Ohio bathing beaches—Distribution, sources, wastewater indicators, and predictive modeling
Results of studies during the recreational seasons of 2000 and 2001 strengthen the science that supports monitoring of our Nation's beaches. Water and sediment samples were collected and analyzed for concentrations of Escherichia coli (E. coli). Ancillary water-quality and environmental data were collected or compiled to determine their relation to E. coli concentrations. Data were...
Authors
Donna S. Francy, Amie M. Gifford, Robert A. Darner