John Besser, PhD (Former Employee)
Science and Products
Filter Total Items: 59
Bioaccumulation of organic and inorganic selenium in a laboratory food chain Bioaccumulation of organic and inorganic selenium in a laboratory food chain
Aquatic organisms accumulated selenium (Se) from inorganic and organic Se species via aqueous and food-chain exposure routes. We measured aqueous and food-chain Se bioaccumulation from selenate, selenite, and seleno-L-methionine in a laboratory food chain of algae (Chlamydomonas reinhardtii), daphnids (Daphnia magna), and fish (bluegill, Lepomis macrochirus). Selenium concentrations were...
Authors
John M. Besser, Timothy J. Canfield, Thomas W. La Point
Contaminated sediments from tributaries of the Great Lakes: Chemical characterization and carcinogenic effects in medaka (Oryzias latipes) Contaminated sediments from tributaries of the Great Lakes: Chemical characterization and carcinogenic effects in medaka (Oryzias latipes)
Sediments from four inshore industrial sites and a reference site in the Great Lakes were extracted with organic solvents to produce a crude extract, which was separated on alumina into two fractions: predominantly polycyclic aromatic hydrocarbons; and predominantly nitrogencontaining polycyclic aromatic compounds. Crude extracts were redissolved in acetone and analyzed by gas...
Authors
John M. Besser, Christopher J. Schmitt, John C. Harshbarger, Paul H. Peterman, Jon A. Lebo
Distribution and bioaccumulation of selenium in aquatic microcosms Distribution and bioaccumulation of selenium in aquatic microcosms
Closed-system microcosms were used to study factors affecting the fate of selenium (Se) in aquatic systems. Distribution and bioaccumulation of Se varied among sediment types and Se species. A mixture of dissolved 75Se species (selenate, selenite and selenomethionine) was sorbed more rapidly to fine-textured, highly organic pond sediments than to sandy riverine sediments. Sulfate did not...
Authors
John M. Besser, James N. Huckins, Edward E. Little, Thomas W. La Point
Chemical characterization and mutagenic properties of polycyclic aromatic compounds in sediment from tributaries of the Great Lakes Chemical characterization and mutagenic properties of polycyclic aromatic compounds in sediment from tributaries of the Great Lakes
Sediments from four inshore industrial sites and a reference site in the Great Lakes were extracted with solvents and characterized chemically for polycyclic aromatic compounds (PACs). An aqueous phase and a crude organic extract were obtained. The crude organic extract was further resolved into fractions A-2 (polycyclic aromatic hydrocarbons) and A-3 (nitrogen-containing polycyclic...
Authors
David L. Fabacher, Christopher J. Schmitt, John M. Besser, Michael J. Mac
Problems on the Upper Mississippi River and its tributaries: Need for a long-term resource monitoring program Problems on the Upper Mississippi River and its tributaries: Need for a long-term resource monitoring program
No abstract available.
Authors
G. A. Jackson, C. E. Korschgen, P. A. Thiel, J. Besser
Science and Products
Filter Total Items: 59
Bioaccumulation of organic and inorganic selenium in a laboratory food chain Bioaccumulation of organic and inorganic selenium in a laboratory food chain
Aquatic organisms accumulated selenium (Se) from inorganic and organic Se species via aqueous and food-chain exposure routes. We measured aqueous and food-chain Se bioaccumulation from selenate, selenite, and seleno-L-methionine in a laboratory food chain of algae (Chlamydomonas reinhardtii), daphnids (Daphnia magna), and fish (bluegill, Lepomis macrochirus). Selenium concentrations were...
Authors
John M. Besser, Timothy J. Canfield, Thomas W. La Point
Contaminated sediments from tributaries of the Great Lakes: Chemical characterization and carcinogenic effects in medaka (Oryzias latipes) Contaminated sediments from tributaries of the Great Lakes: Chemical characterization and carcinogenic effects in medaka (Oryzias latipes)
Sediments from four inshore industrial sites and a reference site in the Great Lakes were extracted with organic solvents to produce a crude extract, which was separated on alumina into two fractions: predominantly polycyclic aromatic hydrocarbons; and predominantly nitrogencontaining polycyclic aromatic compounds. Crude extracts were redissolved in acetone and analyzed by gas...
Authors
John M. Besser, Christopher J. Schmitt, John C. Harshbarger, Paul H. Peterman, Jon A. Lebo
Distribution and bioaccumulation of selenium in aquatic microcosms Distribution and bioaccumulation of selenium in aquatic microcosms
Closed-system microcosms were used to study factors affecting the fate of selenium (Se) in aquatic systems. Distribution and bioaccumulation of Se varied among sediment types and Se species. A mixture of dissolved 75Se species (selenate, selenite and selenomethionine) was sorbed more rapidly to fine-textured, highly organic pond sediments than to sandy riverine sediments. Sulfate did not...
Authors
John M. Besser, James N. Huckins, Edward E. Little, Thomas W. La Point
Chemical characterization and mutagenic properties of polycyclic aromatic compounds in sediment from tributaries of the Great Lakes Chemical characterization and mutagenic properties of polycyclic aromatic compounds in sediment from tributaries of the Great Lakes
Sediments from four inshore industrial sites and a reference site in the Great Lakes were extracted with solvents and characterized chemically for polycyclic aromatic compounds (PACs). An aqueous phase and a crude organic extract were obtained. The crude organic extract was further resolved into fractions A-2 (polycyclic aromatic hydrocarbons) and A-3 (nitrogen-containing polycyclic...
Authors
David L. Fabacher, Christopher J. Schmitt, John M. Besser, Michael J. Mac
Problems on the Upper Mississippi River and its tributaries: Need for a long-term resource monitoring program Problems on the Upper Mississippi River and its tributaries: Need for a long-term resource monitoring program
No abstract available.
Authors
G. A. Jackson, C. E. Korschgen, P. A. Thiel, J. Besser