Donald Tillitt, PhD (Former Employee)
Science and Products
Filter Total Items: 215
Effects of methyl testosterone exposure on sexual differentiation in medaka, Oryzias latipes Effects of methyl testosterone exposure on sexual differentiation in medaka, Oryzias latipes
Studies were conducted to characterize effects of a known androgen on sexual differentiation and development of medaka, Oryzias latipes (d-rR strain), at two life stages. Embryos were injected with graded doses of methyl testosterone (MT) prior to epiboly. The occurrence of sex-reversal, and the gonadosomatic index (GSI) were evaluated in adults. Primary germ cells were counted and gonad...
Authors
D. M. Papoulias, Douglas B. Noltie, D. E. Tillitt
Evaluation of planar halogenated and polycyclic aromatic hydrocarbons in estuarine sediments using ethoxyresorufin-O-deethylase induction of H4IIE cells Evaluation of planar halogenated and polycyclic aromatic hydrocarbons in estuarine sediments using ethoxyresorufin-O-deethylase induction of H4IIE cells
Polycyclic aromatic hydrocarbons (PAHs) and planar halogenated hydrocarbons (PHHs), including polychlorinated dibenzo-p-dioxins (PCDDs), dibenzofurans (PCDFs), and biphenyls (PCBs) were determined in fractionated sediment extracts from the Hudson-Raritan estuary and Newark Bay, New Jersey, USA, as part of a comprehensive risk assessment. Contributions of PCDDs/PCDFs, PCBs, and PAHs to...
Authors
R.W. Gale, E.R. Long, T.R. Schwartz, D. E. Tillitt
Comparing polychlorinated biphenyl concentrations and patterns in the Saginaw River using sediment, caged fish, and semipermeable membrane devices Comparing polychlorinated biphenyl concentrations and patterns in the Saginaw River using sediment, caged fish, and semipermeable membrane devices
Three techniques of assessing bioavailable polychlorinated biphenyls (PCBs) in the Saginaw River, MI, were compared: sediments, caged fish, and semipermeable membrane devices (SPMDs). SPMDs and caged fish were placed in the river for 28 days at five sites where sediments were also sampled. The samples were analyzed for PCB congeners to determine concentrations and patterns. Total PCB
Authors
K. R. Echols, R.W. Gale, T.R. Schwartz, J.N. Huckins, L.L. Williams, J.C. Meadows, D. Morse, J. D. Petty, C.E. Orazio, D. E. Tillitt
Progress and over-view of current GLFT EMS project: Report on Early Mortality Syndrome Workshop Progress and over-view of current GLFT EMS project: Report on Early Mortality Syndrome Workshop
No abstract available at this time
Authors
J. Fitzsimons, S.B. Brown, D. C. Honeyfield, D. E. Tillitt
Observed changes in early mortality syndrome in Lake Michigan coho and chinook salmon from 1994-1999 Observed changes in early mortality syndrome in Lake Michigan coho and chinook salmon from 1994-1999
No abstract available at this time
Authors
J. Hnath, M. Wolgamood, S.V. Marcquenski, S.B. Brown, J.D. Fitzsimons, D. E. Tillitt, D. C. Honeyfield
Dietary alewife and bloater chub effect on lake trout egg thiamine; Report on early mortality syndrome workshop Dietary alewife and bloater chub effect on lake trout egg thiamine; Report on early mortality syndrome workshop
No abstract available at this time
Authors
D. C. Honeyfield, J. P. Hinterkopf, J. Fitzsimons, S.B. Brown, D. E. Tillitt
Science and Products
Filter Total Items: 215
Effects of methyl testosterone exposure on sexual differentiation in medaka, Oryzias latipes Effects of methyl testosterone exposure on sexual differentiation in medaka, Oryzias latipes
Studies were conducted to characterize effects of a known androgen on sexual differentiation and development of medaka, Oryzias latipes (d-rR strain), at two life stages. Embryos were injected with graded doses of methyl testosterone (MT) prior to epiboly. The occurrence of sex-reversal, and the gonadosomatic index (GSI) were evaluated in adults. Primary germ cells were counted and gonad...
Authors
D. M. Papoulias, Douglas B. Noltie, D. E. Tillitt
Evaluation of planar halogenated and polycyclic aromatic hydrocarbons in estuarine sediments using ethoxyresorufin-O-deethylase induction of H4IIE cells Evaluation of planar halogenated and polycyclic aromatic hydrocarbons in estuarine sediments using ethoxyresorufin-O-deethylase induction of H4IIE cells
Polycyclic aromatic hydrocarbons (PAHs) and planar halogenated hydrocarbons (PHHs), including polychlorinated dibenzo-p-dioxins (PCDDs), dibenzofurans (PCDFs), and biphenyls (PCBs) were determined in fractionated sediment extracts from the Hudson-Raritan estuary and Newark Bay, New Jersey, USA, as part of a comprehensive risk assessment. Contributions of PCDDs/PCDFs, PCBs, and PAHs to...
Authors
R.W. Gale, E.R. Long, T.R. Schwartz, D. E. Tillitt
Comparing polychlorinated biphenyl concentrations and patterns in the Saginaw River using sediment, caged fish, and semipermeable membrane devices Comparing polychlorinated biphenyl concentrations and patterns in the Saginaw River using sediment, caged fish, and semipermeable membrane devices
Three techniques of assessing bioavailable polychlorinated biphenyls (PCBs) in the Saginaw River, MI, were compared: sediments, caged fish, and semipermeable membrane devices (SPMDs). SPMDs and caged fish were placed in the river for 28 days at five sites where sediments were also sampled. The samples were analyzed for PCB congeners to determine concentrations and patterns. Total PCB
Authors
K. R. Echols, R.W. Gale, T.R. Schwartz, J.N. Huckins, L.L. Williams, J.C. Meadows, D. Morse, J. D. Petty, C.E. Orazio, D. E. Tillitt
Progress and over-view of current GLFT EMS project: Report on Early Mortality Syndrome Workshop Progress and over-view of current GLFT EMS project: Report on Early Mortality Syndrome Workshop
No abstract available at this time
Authors
J. Fitzsimons, S.B. Brown, D. C. Honeyfield, D. E. Tillitt
Observed changes in early mortality syndrome in Lake Michigan coho and chinook salmon from 1994-1999 Observed changes in early mortality syndrome in Lake Michigan coho and chinook salmon from 1994-1999
No abstract available at this time
Authors
J. Hnath, M. Wolgamood, S.V. Marcquenski, S.B. Brown, J.D. Fitzsimons, D. E. Tillitt, D. C. Honeyfield
Dietary alewife and bloater chub effect on lake trout egg thiamine; Report on early mortality syndrome workshop Dietary alewife and bloater chub effect on lake trout egg thiamine; Report on early mortality syndrome workshop
No abstract available at this time
Authors
D. C. Honeyfield, J. P. Hinterkopf, J. Fitzsimons, S.B. Brown, D. E. Tillitt
*Disclaimer: Listing outside positions with professional scientific organizations on this Staff Profile are for informational purposes only and do not constitute an endorsement of those professional scientific organizations or their activities by the USGS, Department of the Interior, or U.S. Government