Keith A Loftin, Ph.D.
Products and information related to Keith Loftin.
Science and Products
Characterization of polyoxyethylene tallow amine surfactants in technical mixtures and glyphosate formulations using ultra-high performance liquid chromatography and triple quadrupole mass spectrometry
Initial results from a reconnaissance of cyanobacteria and associated toxins in Illinois, August--October 2012
Relations between DNA- and RNA-based molecular methods for cyanobacteria and microcystin concentration at Maumee Bay State Park Lakeside Beach, Oregon, Ohio, 2012
Water samples were collected from Maumee Bay State Park Lakeside Beach, Oregon, Ohio, during the 2012 recreational season and analyzed for selected cyanobacteria gene sequences by DNA-based quantitative polymerase chain reaction (qPCR) and RNA-based quantitative reverse-transcription polymerase chain reaction (qRT-PCR). Results from the four DNA assays (for quantifying total cyanobacteria, total M
Fate and transport of cyanobacteria and associated toxins and taste-and-odor compounds from upstream reservoir releases in the Kansas River, Kansas, September and October 2011
Microphotographs of cyanobacteria documenting the effects of various cell-lysis techniques
Effects of light and nutrients on seasonal phytoplankton succession in a temperate eutrophic coastal lagoon
Antibiotic fate and transport in three effluent-dominated Ozark streams
Laboratory simulated transport of microcystin-LR and cylindrospermopsin in groundwater under the influence of stormwater ponds: implications for harvesting of infiltrated stormwater
Use and environmental occurrence of pharmaceuticals in freestall dairy farms with manured forage fields
Cyanotoxin mixtures and taste-and-odor compounds in cyanobacterial blooms from the midwestern united states
Tet and sul antibiotic resistance genes in livestock lagoons of various operation type, configuration, and antibiotic occurrence
Determination of glyphosate, its degradation product aminomethylphosphonic acid, and glufosinate, in water by isotope dilution and online solid-phase extraction and liquid chromatography/tandem mass spectrometry
Science and Products
- Science
Filter Total Items: 27
- Data
Filter Total Items: 22No Result Found
- Multimedia
- Publications
Filter Total Items: 77
Characterization of polyoxyethylene tallow amine surfactants in technical mixtures and glyphosate formulations using ultra-high performance liquid chromatography and triple quadrupole mass spectrometry
Little is known about the occurrence, fate, and effects of the ancillary additives in pesticide formulations. Polyoxyethylene tallow amine (POEA) is a non-ionic surfactant used in many glyphosate formulations, a widely applied herbicide both in agricultural and urban environments. POEA has not been previously well characterized, but has been shown to be toxic to various aquatic organisms. CharacteAuthorsDaniel Tush, Keith A. Loftin, Michael T. MeyerInitial results from a reconnaissance of cyanobacteria and associated toxins in Illinois, August--October 2012
Ten lakes and two rivers in Illinois were sampled in August–October 2012 to determine the concentrations and spatial distribution of cyanobacteria and associated cyanotoxins throughout the State. The reconnaissance was a collaborative effort of the U.S. Geological Survey and the Illinois Environmental Protection Agency. Sample results indicated that concentrations of both total cyanobacterial cellAuthorsPaul J. Terrio, Lenna M. Ostrodka, Keith A. Loftin, Gregg Good, Teri HollandRelations between DNA- and RNA-based molecular methods for cyanobacteria and microcystin concentration at Maumee Bay State Park Lakeside Beach, Oregon, Ohio, 2012
Water samples were collected from Maumee Bay State Park Lakeside Beach, Oregon, Ohio, during the 2012 recreational season and analyzed for selected cyanobacteria gene sequences by DNA-based quantitative polymerase chain reaction (qPCR) and RNA-based quantitative reverse-transcription polymerase chain reaction (qRT-PCR). Results from the four DNA assays (for quantifying total cyanobacteria, total M
AuthorsErin A. Stelzer, Keith A. Loftin, Pamela StruffolinoFate and transport of cyanobacteria and associated toxins and taste-and-odor compounds from upstream reservoir releases in the Kansas River, Kansas, September and October 2011
Cyanobacteria cause a multitude of water-quality concerns, including the potential to produce toxins and taste-and-odor compounds. Toxins and taste-and-odor compounds may cause substantial economic and public health concerns and are of particular interest in lakes, reservoirs, and rivers that are used for drinking-water supply, recreation, or aquaculture. The Kansas River is a primary source of drAuthorsJennifer L. Graham, Andrew C. Ziegler, Brian L. Loving, Keith A. LoftinMicrophotographs of cyanobacteria documenting the effects of various cell-lysis techniques
Cyanotoxins are a group of organic compounds biosynthesized intracellularly by many species of cyanobacteria found in surface water. The United States Environmental Protection Agency has listed cyanotoxins on the Safe Drinking Water Act's Contaminant Candidate List 3 for consideration for future regulation to protect public health. Cyanotoxins also pose a risk to humans and other organisms in a vaAuthorsBarry H. Rosen, Keith A. Loftin, Christopher E. Smith, Rachael F. Lane, Susan P. KeydelEffects of light and nutrients on seasonal phytoplankton succession in a temperate eutrophic coastal lagoon
Rodeo Lagoon, a low-salinity coastal lagoon in the Golden Gate National Recreation Area, California, United States, has been identified as an important ecosystem due to the presence of the endangered goby (Eucyclogobius newberri). Despite low anthropogenic impacts, the lagoon exhibits eutrophic conditions and supports annual episodes of very high phytoplankton biomass. Weekly assessments (FebruaryAuthorsJeana L. Drake, Edward J. Carpenter, Mary Cousins, Kara L. Nelson, Alejandro Guido-Zarate, Keith A. LoftinAntibiotic fate and transport in three effluent-dominated Ozark streams
Antibiotic transport downstream from a wastewater treatment plant effluent discharge was evaluated along stream reaches on Mud Creek, Spring Creek, and Decatur Branch in northwestern Arkansas, USA. Water and streambed samples were collected during August and September 2006 and analyzed for multiple antibiotics representing five classes (beta-lactams, macrolides, quinolones, sulfonamides, and tetraAuthorsLeslie B. Massey, Brian E. Haggard, Joel M. Galloway, Keith A. Loftin, Michael T. Meyer, W. Reed GreenLaboratory simulated transport of microcystin-LR and cylindrospermopsin in groundwater under the influence of stormwater ponds: implications for harvesting of infiltrated stormwater
Water shortages in the southeastern United States have led to a need for more intensive management and usage of stormwater for beneficial uses such as irrigation. Harvesting of infiltrated stormwater from horizontal wells in sandy aquifer sediments beneath stormwater ponds has emerged as an alternative in need of evaluation. Cyanobacteria may proliferate in stormwater ponds; cyanotoxins produced bAuthorsAndrew M. O'Reilly, Martin P. Wanielista, Keith A. Loftin, Ni-Bin ChangUse and environmental occurrence of pharmaceuticals in freestall dairy farms with manured forage fields
Environmental releases of antibiotics from concentrated animal feeding operations (CAFOs) are of increasing regulatory concern. This study investigates the use and occurrence of antibiotics in dairy CAFOs and their potential transport into first-encountered groundwater. On two dairies we conducted four seasonal sampling campaigns, each across 13 animal production and waste management systems and aAuthorsNaoko Watanabe, Brian A. Bergamaschi, Keith A. Loftin, Michael T. Meyer, Thomas HarterCyanotoxin mixtures and taste-and-odor compounds in cyanobacterial blooms from the midwestern united states
The mixtures of toxins and taste-and-odor compounds present during cyanobacterial blooms are not well characterized and of particular concern when evaluating potential human health risks. Cyanobacterial blooms were sampled in twenty-three Midwestern United States lakes and analyzed for community composition, thirteen cyanotoxins by liquid chromatography/mass spectrometry and immunoassay, and two tAuthorsJennifer L. Graham, Keith A. Loftin, Michael T. Meyer, Andrew C. ZieglerTet and sul antibiotic resistance genes in livestock lagoons of various operation type, configuration, and antibiotic occurrence
Although livestock operations are known to harbor elevated levels of antibiotic resistant bacteria, few studies have examined the potential of livestock waste lagoons to reduce antibiotic resistance genes (ARGs). The purpose of this study was to determine the prevalence and examine the behavior of tetracycline [tet(O) and tet(W)] and sulfonamide [sul(I) and su/(II)] ARGsin a broad cross-section ofAuthorsC.W. McKinney, Keith A. Loftin, Michael T. Meyer, J.G. Davis, A. PrudenDetermination of glyphosate, its degradation product aminomethylphosphonic acid, and glufosinate, in water by isotope dilution and online solid-phase extraction and liquid chromatography/tandem mass spectrometry
The U.S. Geological Survey method (0-2141-09) presented is approved for the determination of glyphosate, its degradation product aminomethylphosphonic acid (AMPA), and glufosinate in water. It was was validated to demonstrate the method detection levels (MDL), compare isotope dilution to standard addition, and evaluate method and compound stability. The original method USGS analytical method 0-213AuthorsMichael T. Meyer, Keith A. Loftin, Edward A. Lee, Gary H. Hinshaw, Julie E. Dietze, Elisabeth A. Scribner - Software
- News