Michael T Meyer, Ph.D.
Science and Products
Organic Geochemistry Research Laboratory — Lawrence, Kansas
About the Laboratory
Chemists and geologists at the Kansas Water Science Center's Organic Geochemistry Research Laboratory (OGRL) develop targeted and non-targeted analytical methods for the identification and quantitation of chemicals that can impact the health of humans and other organisms and use bioassays to screen for receptor inhibition. They have developed...
Gestodene Affects Fish Reproductive Behavior in Laboratory Exposure Study
Short-term laboratory exposure of adult fathead minnows to the human contraceptive progestin, gestodene (GES), at environmentally relevant concentrations induced rapid and negative effects on reproductive health and suggests that wild fish may be similarly affected.
Antibiotic Methods of Analysis: OGRL LCAB
Antibiotics are used for human health and livestock management and health. The increase of antibiotic resistant infections has resulted in concern that sub-therapeutic use of antibiotics for weight gain in livestock and the release of low levels of antibiotics into surface and groundwater from urban and agricultural sources may be contributing to this problem.
Synthetic Progestin Affects Fish Reproductive Development and Behavior in Laboratory Exposure Study
Scientists conducted laboratory experiments on levonorgestrel (a synthetic progestin) and observed differential effects to males (reproductive behavior) and females (masculinization) of eastern mosquitofish (Gambusia holbrooki).
Organic Geochemistry Research Laboratory Scored High on Proficiency Testing for Glyphosate
In a recent inter–laboratory comparison of 28 international laboratories, the U.S. Geological Survey (USGS) Organic Geochemistry Research Laboratory (OGRL) scored A's for the analysis of glyphosate and aminomethylphosphonic acid (AMPA) in this proficiency testing.
Contaminants of emerging concern in the environment: Where we have been and what does the future hold?
In 1962, Rachel Carson’s book Silent Spring alerted the nation to the dangers of manmade chemicals and indiscriminate use of pesticides. DDT was the culprit and its use threatened a variety of wildlife, including the national bird, bald eagles. In 1969, pressured by scientists and the public, the United States banned almost all uses of DDT;...
Battaglin, William A.; Kolpin, Dana W.; Furlong, Edward T.; Glassmeyer, Susan; Blackwell, Brett R.; Corsi, Steven; Meyer, Michael T.; Bradley, Paul M. Reconnaissance of mixed organic and inorganic chemicals in private and public supply tapwaters at selected residential and workplace sites in the United States
Safe drinking water at the point-of-use (tapwater, TW) is a United States public health priority. Multiple lines of evidence were used to evaluate potential human health concerns of 482 organics and 19 inorganics in TW from 13 (7 public supply, 6 private well self-supply) home and 12 (public supply) workplace locations in 11 states. Only uranium (...
Bradley, Paul M.; Kolpin, Dana W.; Romanok, Kristin M.; Smalling, Kelly L.; Focazio, Michael J.; Brown, Juliane B.; Cardon, Mary C.; Carpenter, Kurt; Corsi, Steven R.; DeCicco, Laura A.; Dietze, Julie E.; Evans, Nicola; Furlong, Edward T.; Givens, Carrie E.; Gray, James; Griffin, Dale W.; Higgins, Christopher P.; Hladik, Michelle L.; Iwanowicz, Luke R. ; Journey, Celeste A.; Kuivila, Kathryn ; Masoner, Jason R.; McDonough, Carrie A.; Meyer, Michael T.; Orlando, James L.; Strynar, Mark J.; Weis, Christopher P.; Wilson, Vickie S.
Methods used for the collection and analysis of chemical and biological data for the Tapwater Exposure Study, United States, 2016–17
In 2016, the U.S. Geological Survey (USGS) Environmental Health Mission Area, initiated the Tapwater Exposure Study as part of an infrastructure project to assess human exposure to potential threats from complex mixtures of contaminants. In the pilot phase (2016), samples were collected from 11 States throughout the United States, and in the...
Romanok, Kristin M.; Kolpin, Dana W.; Meppelink, Shannon M.; Argos, Maria; Brown, Juliane B.; Devito, Michael J.; Dietze, Julie E.; Givens, Carrie E.; Gray, James L.; Higgins, Christopher P.; Hladik, Michelle L.; Iwanowicz, Luke R.; Loftin, Keith A.; McCleskey, R. Blaine; McDonough, Carrie A.; Meyer, Michael T.; Strynar, Mark J.; Weis, Christopher P.; Wilson, Vickie S.; Bradley, Paul M. Investigating the influence of nitrate nitrogen on post-smolt Atlantic salmon Salmo salar reproductive physiology in water recirculation aquaculture systems
A major issue affecting land-based, closed containment Atlantic salmon Salmo salar growout production in water recirculation aquaculture systems (RAS) is precocious male maturation, which can negatively impact factors such as feed conversion, fillet yield, and product quality. Along with other water quality parameters, elevated ...
Good, Christopher; Davidson, John; Iwanowicz, Luke R.; Meyer, Michael T.; Dietze, Julie E.; Kolpin, Dana W.; Marancik, David; Birkett, Jill; Williams, Christina; Summerfelt, Steven T. Expanded target-chemical analysis reveals extensive mixed-organic-contaminant exposure in USA streams
Surface water from 38 streams nationwide was assessed using 14 target-organic methods (719 compounds). Designed-bioactive anthropogenic contaminants (biocides, pharmaceuticals) comprised 57% of 406 organics detected at least once. The 10 most-frequently detected anthropogenic-organics included eight pesticides (desulfinylfipronil, AMPA,...
Bradley, Paul M.; Journey, Celeste A.; Romanok, Kristin M.; Barber, Larry B.; Buxton, Herbert T.; Foreman, William T.; Furlong, Edward T.; Glassmeyer, Susan T.; Hladik, Michelle L.; Iwanowicz, Luke R. ; Jones, Daniel K.; Kolpin, Dana W.; Kuivila, Kathryn M. ; Loftin, Keith A.; Mills, Marc A.; Meyer, Michael T.; Orlando, James L. ; Reilly, Timothy J.; Smalling, Kelly L. ; Villeneuve, Daniel L.
Methods used to characterize the chemical composition and biological activity of environmental waters throughout the United States, 2012-14
A vast array of chemical compounds are in wide commercial use in the United States, and the potential ecological and human-health effect of exposure to chemical mixtures has been identified as a high priority in environment health science. Awareness of the potential effects of low-level chemical exposures is rising. The U.S. Geological Survey, in...
Romanok, Kristin M. ; Reilly, Timothy J.; Barber, Larry B.; Boone, J. Scott; Buxton, Herbert T.; Foreman, William T. ; Furlong, Edward T.; Hladik, Michelle; Iwanowicz, Luke R. ; Journey, Celeste A.; Kolpin, Dana W.; Kuivila, Kathryn ; Loftin, Keith A.; Mills, Marc A.; Meyer, Michael T.; Orlando, James L. ; Smalling, Kelly L. ; Villeneuve, Daniel L.; Bradley, Paul M. Similarities and differences in occurrence and temporal fluctuations in glyphosate and atrazine in small Midwestern streams (USA) during the 2013 growing season
Glyphosate and atrazine are the most intensively used herbicides in the United States. Although there is abundant spatial and temporal information on atrazine occurrence at regional scales, there are far fewer data for glyphosate, and studies that compare the two herbicides are rare. We investigated temporal patterns in glyphosate and atrazine...
Mahler, Barbara; Van Metre, Peter C.; Burley, Thomas E.; Loftin, Keith A.; Meyer, Michael T.; Nowell, Lisa H. Exposure to the contraceptive progestin, gestodene, alters reproductive behavior, arrests egg deposition, and masculinizes development in the fathead minnow (Pimephales promelas)
Endogenous progestogens and pharmaceutical progestins enter the environment through wastewater treatment plant effluent and agricultural field runoff. Lab studies demonstrate strong, negative exposure effects of these chemicals on aquatic vertebrate reproduction. Behavior can be a sensitive, early indicator of exposure to environmental...
Frankel, Tyler E.; Meyer, Michael T.; Kolpin, Dana W.; Gillis, Amanda B.; Alvarez, David A.; Orlando, Edward F. Concentrations of glyphosate and atrazine compounds in 100 Midwest United States streams in 2013
Temporal patterns in glyphosate and atrazine concentrations were measured weekly by the U.S. Geological Survey (USGS) during the 2013 growing season in 100 small streams in the Midwestern United States. Concentrations also were measured every 2 days at a subset of 8 of the sites, all located in Missouri. Glyphosate was detected more frequently in...
Mahler, Barbara J.; Van Metre, Peter C.; Burley, Thomas E.; Loftin, Keith A.; Meyer, Michael T.; Nowell, Lisa H. Aqueous exposure to the progestin, levonorgestrel, alters anal fin development and reproductive behavior in the eastern mosquitofish (Gambusia holbrooki)
Endogenous progestogens are important regulators of vertebrate reproduction. Synthetic progestins are components of human contraceptive and hormone replacement pharmaceuticals. Both progestogens and progestins enter the environment through a number of sources, and have been shown to cause profound effects on reproductive health in various aquatic...
Frankel, Tyler E.; Meyer, Michael T.; Orlando, Edward F. Cyanotoxins in inland lakes of the United States: Occurrence and potential recreational health risks in the EPA National Lakes Assessment 2007
A large nation-wide survey of cyanotoxins (1161 lakes) in the United States (U.S.) was conducted during the EPA National Lakes Assessment 2007. Cyanotoxin data were compared with cyanobacteria abundance- and chlorophyll-based World Health Organization (WHO) thresholds and mouse toxicity data to evaluate potential recreational risks....
Loftin, Keith A.; Graham, Jennifer L.; Elizabeth Hilborn; Sarah Lehmann; Meyer, Michael T.; Dietze, Julie E.; Griffith, Christopher
Total cylindrospermopsins, microcystins/nodularins, and saxitoxins data for the 2007 United States Environmental Protection Agency National Lake Assessment
Phytoplankton communities in freshwater lakes, ponds, and reservoirs may be dominated by cyanobacteria (also called blue-green algae) under certain environmental conditions. Cyanobacteria may cause a range of water-quality impairments, including the potential for toxin production. Cyanobacteria toxins (cyanotoxins) may adversely impact human and...
Loftin, Keith A.; Dietze, Julie E.; Meyer, Michael T.; Graham, Jennifer L.; Maksimowicz, Megan M.; Toyne, Kathryn D.