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Results:
1,873 - 1,893 of
1,893
Anodonta imbecillis QA Test 4, Clinch River - Environmental restoration program (CR-ERP)
Toxicity testing of split whole sediment samples using juvenile freshwater mussels (Anodonta imbecillis) was conducted by TVA to provide a quality assurance mechanism for test organism quality and overall performance of the test being conducted by CR-ERP personnel as part of the CR-ERP biomonitoring study of Clinch River sediments. Testing of sediment samples collected September 8 from Poplar Creek Miles 6.0 and 1.0 was conducted September 13-22, 1994. Results from this test showed no toxicity (survival effects) to fresh-water mussels during a 9-day exposure to the sediments.
Date:
June 1, 1997
Creator:
Simbeck, D.J.
Object Type:
Report
System:
The UNT Digital Library
Clinch River - Environmental Restoration Program (CR-ERP) pilot study, ambient water toxicity
Clinch River - Environmental Restoration Program (CR-ERP) personnel and Tennessee Valley Authority (TVA) personnel conducted a pilot study during the week of April 22-29, 1993, prior to initiation of CR-ERP Phase II Sampling and Analysis activities as described in the Statement of Work (SOW) document. The organisms specified for testing were larval fathead minnows, Pimephales promelas, and the daphnid, Ceriodaphnia dubia. Surface water samples were collected by TVA Field Engineering personnel from Clinch River Mile 9.0 and Poplar Creek Kilometer 1.6 on April 21, 23, and 26. Samples were split and provided to the CR-ERP and TVA toxicology laboratories for testing. Exposure of test organisms to these samples resulted in no toxicity (survival, growth, or reproduction) to either species in testing conducted by TVA.
Date:
June 1, 1997
Creator:
Simbeck, D.J.
Object Type:
Report
System:
The UNT Digital Library
Anodonta imbecillis copper sulfate reference toxicant test, Clinch River - Environmental Restoration Program (CR-ERP)
Reference toxicant testing using juvenile freshwater mussels was conducted as part of the CR-ERP biomonitoring study of Clinch River sediments to assess the sensitivity of test organisms and the overall performance of the test. Tests were conducted using moderately hard synthetic water spiked with known concentrations of copper as copper sulfate. Toxicity testing of copper sulfate reference toxicant was conducted from May 12-21, 1993. The organisms used for testing were juvenile fresh-water mussels (Anodonta imbecillis). Results from this test showed an LC{sub 50} value of 1.12 mg Cu/L which is lower than the value of 2.02 mg Cu/L obtained in a previous test. Too few tests have been conducted with copper as the toxicant to determine a normal range of values.
Date:
June 1, 1997
Creator:
Simbeck, D.J.
Object Type:
Report
System:
The UNT Digital Library
Anodonta imbecillis QA Test 1, Clinch River - Environmental Restoration Program (CR-ERP)
Toxicity testing of split whole sediment samples using juvenile freshwater mussels (Anodonta imbecillis) was conducted by TVA and CR-ERP personnel as part of the CR-ERP biomonitoring study of Clinch River sediments to provide a quality assurance mechanism for test organism quality and overall performance of the test. In addition, testing included procedures comparing daily renewal versus non-renewal of test sediments. Testing of sediment samples collected July 15 from Poplar Creek Miles 6.0 and 5.1 was conducted from July 21-30, 1993. Results from this test showed no toxicity (survival effects) to fresh-water mussels during a 9-day exposure to the sediments. Side by side testing of sediments with daily sediment renewal and no sediment renewal showed no differences between methods. This may be due to the absence of toxicity in both samples and may not reflect true differences between the two methods for toxic sediment.
Date:
June 1, 1997
Creator:
Simbeck, D.J.
Object Type:
Report
System:
The UNT Digital Library
Anodonta imbecillis QA Test 3, Clinch River - Environmental Restoration Program (CR-ERP)
Toxicity testing of split whole sediment samples using juvenile freshwater mussels (Anodonta imbecillis) was conducted by TVA to provide a quality assurance mechanism for test organism quality and overall performance of the test being conducted by CR-ERP personnel as part of the CR-ERP biomonitoring study of Clinch River sediments. Testing of sediment samples collected May 5 from Poplar Creek Miles 6.0 and 2.9 was conducted from May 10-19, 1994. Results from this test showed no toxicity (survival effects) to fresh-water mussels during a 9-day exposure to the sediments.
Date:
June 1, 1997
Creator:
Simbeck, D.J.
Object Type:
Report
System:
The UNT Digital Library
Chemical activation of molecules by metals: Experimental studies of electron distributions and bonding. Technical progress report, March 1, 1992--February 28, 1995
During this period of the project we have (1) accomplished the high-resolution gas phase photoelectron spectra of C{sub 60} and C{sub 70}, (2) characterized the electronic features of imaging C{sub 60} on gold by STM, (3) evaluated the orbital distributions of C{sub 60} and the bonding interactions with metals, (4) revealed details of the bonding of phosphines to metals, including the subtleties of a geometrical twist in sterically crowded situations, (5) determined the formal electron distribution in the bonding of {eta}{sup 3} -cyclopropenyl with metals, (6) related gas-phase ionization energies to electron transfer kinetics and ion salvation thermochemistry of metallocenes, (7) correlated lone-pair ionization energies with proton affinities for a variety of amino acids and related compounds, (8) examined sigma-pi interactions in non-conjugated polyalkynes, (9) characterized extensive metal-ligand {pi} interactions in metal-acetylide compounds, and (10) continued to develop the experimental and theoretical methods for these studies. All of these studies have contributed significantly to expanding our understanding of the electronic structure and bonding of organic molecules and the ways this electronic structure is altered by interaction with metals. Further developments in the instrumentation and methods of gas phase and surface photoelectron spectroscopy are underway. Most notable is the progress on …
Date:
June 1, 1997
Creator:
Lichtenberger, D.L.
Object Type:
Report
System:
The UNT Digital Library
Anodonta imbecillis QA Test 2, Clinch River - Environmental Restoration Program (CR-ERP)
Toxicity testing of split whole sediment samples using juvenile freshwater mussels (Atiodonta imbecillis) was conducted by TVA to provide a quality assurance mechanism for test organism quality and overall performance of the test being conducted by CR-ERP personnel as part of the CR-ERP biomonitoring study of Clinch River sediments. Testing of sediment samples collected August 14 from Poplar Creek Miles 6.0 and 4.3 was conducted from August 24-September 2, 1993. Results from this test showed no toxicity (survival effects) to fresh--water mussels during a 9-day exposure to the sediments.
Date:
June 1, 1997
Creator:
Simbeck, D.J.
Object Type:
Report
System:
The UNT Digital Library
Clinch River - Environmental Restoration Program (CR-ERP) study, ambient water toxicity
Clinch River - Environmental Restoration Program (CR-ERP) personnel and Tennessee Valley Authority (TVA) personnel conducted a study during the week of April 14-21, 1994, as described in the Statement of Work (SOW) document. The organisms specified for testing were larval fathead minnows, Pimephales promelas, and the daphnid, Ceriodaphnia dubia. Surface water samples were collected by TVA Field Engineering personnel from Poplar Creek Mile 4.3, Poplar Creek Mile 5.1, and Poplar Creek Mile 6.0 on April 13, 15, and 18. Samples were partitioned (split) and provided to the CR-ERP and TVA toxicology laboratories for testing. Exposure of test organisms to these samples resulted in no toxicity (survival or growth) to daphnids in undiluted samples; however, toxicity to fathead minnows (significantly reduced survival) was demonstrated in undiluted samples from Poplar Creek Miles 4.3 and 6.0 in testing conducted by TVA based on hypothesis testing of data. Daphnid reproduction was significantly less than controls in 50 percent dilutions of samples from Poplar Creek Miles 4.3 and 6.0, while no toxicity to fathead minnows was shown in diluted (50 percent) samples.
Date:
June 1, 1997
Creator:
Simbeck, D.J.
Object Type:
Report
System:
The UNT Digital Library
Clinch River - Environmental Restoration Program (CR-ERP) study, ambient water toxicity
Clinch River - Environmental Restoration Program (CR-ERP) personnel and Tennessee Valley Authority (TVA) personnel conducted a study during the week of July 22-29, 1993, as described in the Statement of Work (SOW) document. The organisms specified for testing were larval fathead minnows, Pimephales promelas, and the daphnid, Ceriodaphnia dubia. Surface water samples were collected by TVA Field Engineering personnel from Clinch River Mile 19.0 and Mile 22.0 on July 21, 23, and 26. Samples were split and provided to the CR-ERP and TVA toxicology laboratories for testing. Exposure of test organisms to these samples resulted in no toxicity (survival, growth, or reproduction) to either species in testing conducted by TVA.
Date:
June 1, 1997
Creator:
Russell, C.L.
Object Type:
Report
System:
The UNT Digital Library
Task 5: TVA sediment-disturbing activities within the Watts Bar Reservoir and Melton Hill Reservoir areas of the Clinch River
The objectives of Task 5 of the Interagency Agreement No. DE-AI05-91OR22007 were to review: (1) the extent of dredging, construction, and other sediment-disturbing activities conducted by the Tennessee Valley Authority (TVA) in potentially contaminated areas of Watts Bar Reservoir, and (2) the disposition of the materials from these activities. This memorandum is the final report for Task 5. This memorandum describes major activities in the Watts Bar Reservoir and Melton Hill Reservoir areas of the Clinch River that possibly resulted in significant disturbance of potentially contaminated sediments. TVA records from the construction of Watts Bar Dam, Kingston Fossil Plant, and Melton Hill Dam were reviewed to facilitate qualitative description of the effect of these activities in disturbing potentially contaminated sediments. The critical period for these activities in disturbing contaminated sediments was during or after 1956 when the peak releases of radioactive contaminants occurred from the Oak Ridge Reservation.
Date:
June 1, 1997
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Anodonta imbecillis copper sulfate reference toxicant/food test, Clinch River - Environmental Restoration Program (CR-ERP)
Reference toxicant testing using juvenile freshwater mussels was conducted as part of the CR-ERP biomonitoring study of Clinch River sediments to assess the sensitivity of test organisms and the overall performance of the test. Tests were conducted using moderately hard synthetic water spiked with known concentrations of copper as copper sulfate. Two different foods, phytoplankton and YCT-Selenastrum (YCT-S), were tested in side by side tests to compare food quality. Toxicity testing of copper sulfate reference toxicant was conducted from July 6-15, 1993. The organisms used for testing were juvenile fresh-water mussels (Anodonta imbecillis). Results from this test showed LC{sub 50} values of 0.97 and 0.84 mg Cu/L for phytoplankton and YCT-S, respectively. Previously obtained values for phytoplankton tests are 2.02 and 1.12 mg Cu/L. Too few tests have been conducted with copper as the toxicant to determine a normal range of values. Although significant reduction in growth, compared to the phytoplankton control, was seen in all treatments, including the YCT-S Control, the consequence of this observation has not been established. Ninety-day testing of juvenile mussels exhibited large variations in growth within treatment and replicate groups.
Date:
June 1, 1997
Creator:
Simbeck, D.J.
Object Type:
Report
System:
The UNT Digital Library
Clinch River - Environmental Restoration Program (CR-ERP) Study, ambient water toxicity. Final report, October 21, 1993--October 28, 1993
Clinch River - Environmental Restoration Program (CR-ERP) personnel and Tennessee Valley Authority (TVA) personnel conducted a study during the week of October 21-28, 1993, as described in the Statement of Work (SOW) document. The organisms specified for testing were larval fathead minnows, Pimephales promelas, and the daphnid, Ceriodaphnia dubia. Due to serious reproduction/embryo abortion problems with the TVA daphnid cultures, TVA conducted tests during this study period using only fathead minnows. A split sample test using daphnids only will be scheduled during 1994 as a substitute for this study period. Surface water samples were collected by TVA Field Engineering personnel from Poplar Creek Mile 2.9, Mile 4.3, and Mile 5.1 on October 20, 22, and 25. Samples were split and provided to the CR-ERP and TVA toxicology laboratories for testing. Exposure of test organisms to these samples resulted in no toxicity (survival or growth) in testing conducted by TVA.
Date:
June 1, 1997
Creator:
Simbeck, D.J.
Object Type:
Report
System:
The UNT Digital Library
Clinch River - Environmental Restoration Program (CR-ERP) study, Ambient water toxicity
Clinch River - Environmental Restoration Program (CR-ERP) personnel and Tennessee Valley Authority (TVA) personnel conducted a study during the week of January 25-February 1, 1994, as described in the Statement of Work (SOW) document. The organisms specified for testing were larval fathead minnows, Pimephales promelas, and the daphnid, Ceriodaphnia dubia. Surface water samples were collected by TVA Field Engineering personnel from Clinch River Mile 9.0, Poplar Creek Mile 1.0, and Poplar Creek Mile 2.9 on January 24, 26, and 28. Samples were partitioned (split) and provided to the CR-ERP and TVA toxicology laboratories for testing. Exposure of test organisms to these samples resulted in no toxicity (survival or growth) to fathead minnows; however, toxicity to daphnids (significantly reduced reproduction) was demonstrated in undiluted samples from Poplar Creek Mile 1.0 in testing conducted by TVA based on hypothesis testing of data. Point estimation (IC{sub 25}) analysis of the data, however, showed no toxicity in PCM 1.0 samples.
Date:
June 1, 1997
Creator:
Simbeck, D.J.
Object Type:
Report
System:
The UNT Digital Library
[The Transforming Education Through the Arts Challenge - Startup Year Progress Report]
A detailed progress report, documenting the pivotal developments and milestones achieved during the startup year of The Transforming Education Through the Arts Challenge.
Date:
June 30, 1997
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Texas Wetlands Plan Update, Volume 2, Number 1, June 1997
Newsletter published by the Texas Parks and Wildlife Department to provide news, updates, and other information specifically related to wetlands and their conservation in the state.
Date:
June 1997
Creator:
Texas. Parks and Wildlife Department.
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
Texas WIC News, Volume 6, Number 6, June 1997
Bimonthly newsletter of the Texas Department of State Health Services about topics related to the Women, Infants and Children (WIC) program. WIC is a nutritional program that provides education and counselling, nutritious foods, and help accessing health care to low-income women, infants, and children.
Date:
June 1997
Creator:
Texas. Bureau of WIC Nutrition.
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
The Leader (The Colony, Tex.), Vol. 16, No. 27, Ed. 1 Friday, June 6, 1997
Weekly newspaper from The Colony, Texas that includes local, state, and national news along with advertising.
Date:
June 6, 1997
Creator:
Watterson, Tim
Object Type:
Newspaper
System:
The Portal to Texas History
The Leader (The Colony, Tex.), Vol. 16, No. 28, Ed. 1 Friday, June 13, 1997
Weekly newspaper from The Colony, Texas that includes local, state, and national news along with advertising.
Date:
June 13, 1997
Creator:
Watterson, Tim
Object Type:
Newspaper
System:
The Portal to Texas History
The Leader (The Colony, Tex.), Vol. 16, No. 29, Ed. 1 Friday, June 20, 1997
Weekly newspaper from The Colony, Texas that includes local, state, and national news along with advertising.
Date:
June 20, 1997
Creator:
Watterson, Tim
Object Type:
Newspaper
System:
The Portal to Texas History
The Leader (The Colony, Tex.), Vol. 16, No. 30, Ed. 1 Friday, June 27, 1997
Weekly newspaper from The Colony, Texas that includes local, state, and national news along with advertising.
Date:
June 27, 1997
Creator:
Watterson, Tim
Object Type:
Newspaper
System:
The Portal to Texas History
TELEMASP Bulletin, Volume 4, Number 3, June 1997
Monthly bulletin issued to address topics related to law enforcement. This issue discusses "Youth Gangs in Texas: Part II" including the background and statistics
Date:
June 1997
Creator:
Triplett, Ruth
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History