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Excision repair in mammalian cells. [uv radiation, N-acetoxy-2-acetylaminofluorene]

Description: Excision repair after combined treatments of uv and N-acetoxy-2-acetylaminofluorene (AAAF) was studied by three different techniques in cells proficient in uv excision repair and in cells deficient in uv repair. Two patterns of repair were observed: in repair proficient cells total repair was additive, and in repair deficient cells total repair was much less than additive--usually less than observed for separate treatments--and AAAF inhibited dimer excision. We conclude that in the 1st class of… more
Date: January 1, 1978
Creator: Ahmed, F.E. & Setlow, R.B.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Quantitative mammalian cell genetic toxicology: study of the cytotoxicity and mutagenicity of 70 individual environmental agents related to energy technologies and 3 subfractions of a crude synthetic oil in the CHO/HGPRT system. [Hamsters]

Description: Conditions necessary for quantifying mutation-induction to 6-thioguanine resistance, which selects for >98% mutants deficient in the activity of hypoxanthine-guanine phosphoribosyl transferase (HGPRT) in a near-diploid Chinese hamster ovary (CHO) cell line, referred to as CHO/HGPRT system, have been defined. Employing this mutation assay, we have determined the mutagenicity of diversified agents including 11 direct-acting alkylating agents, 16 nitrosamines, 10 heterocyclic nitrogen mustards,… more
Date: January 1, 1978
Creator: Hsie, A. W.; Neill, J. P. & San Sebastian, J. R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Interactive Chemistry of Coal-Petroleum Processing

Description: The objective of this program is to investigate the interactive thermal and catalytic chemistry of coal and petroleum processing using model compounds and actual petroleum-coal materials. This quarter the interactive catalytic chemistry of model coal and petroleum systems was investigated using combined catalysts of molybdenum naphthenate and vanadyl acetylacetonate. This combination was performed in order to evaluate the effect of the presence of an indigenous residuum metal, vanadium, on mode… more
Date: January 1, 1989
Creator: Curtis, C. W.; Guin, J. A. & Tarrer, A. R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Analysis of sediments and soils for chemical contamination for the design of US Navy homeport facility at East Waterway of Everett Harbor, Washington. Final report. [Macoma inquinata; Mytilus edulis]

Description: Contaminated sediments in the East Waterway of Everett Harbor, Washington, are extremely localized; they consist of a layer of organically-rich, fine sediments overlying a relatively cleaner, more sandy native material. The contaminated layer varies in thickness throughout the waterway from as much as 2 meters to only a few centimeters. Generally, the layer is thicker and more contaminated at the head of the waterway (northern end) and becomes thinner and less contaminated as one proceeds south… more
Date: March 1, 1985
Creator: Anderson, J.W. & Crecelius, E.A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Dynamics of Charge-Transfer Excited States Relevant to Photochemical Energy Conversion

Description: A systematic study of intramolecular photoassociation and photoinduced charge transfer (CT) was initiated in bichromophoric systems of M-X-M, where two identical aromatic hydrocarbons M are joined by X=CH[sub 2], O, NH, etc. Dinaphthylamines, dinaphthylethers, and dinaphthylmethanes in nonpolar solvents form triplet excimers, following inter system crossing of singlets to the triplet manifold; in polar solvents, the molecule forms an intramolecular CT state. The interchromophore interaction stu… more
Date: January 1, 1993
Creator: Lim, E. C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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The thermodynamic properties of 2-aminobiphenyl (an intermediate in the carbazole/hydrogen reaction network)

Description: Catalytic hydrodenitrogenation (HDN) is a key step in upgrading processes for conversion of heavy petroleum, shale oil, tar sands, and the products of the liquefaction of coal to economically viable products. This research program provides accurate experimental thermochemical and thermophysical properties for key organic nitrogen-containing compounds present in the range of alternative feedstocks, and applies the experimental information to thermodynamic analyses of key HDN reaction networks. T… more
Date: December 1, 1990
Creator: Steele, W. V.; Chirico, R. D.; Knipmeyer, S. E. & Nguyen, A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Dynamics of Charge-Transfer Excited States Relevant to Photochemical Energy Conversion. Technical Report, June 1, 1992--March 30, 1993

Description: A systematic study of intramolecular photoassociation and photoinduced charge transfer (CT) was initiated in bichromophoric systems of M-X-M, where two identical aromatic hydrocarbons M are joined by X=CH{sub 2}, O, NH, etc. Dinaphthylamines, dinaphthylethers, and dinaphthylmethanes in nonpolar solvents form triplet excimers, following inter system crossing of singlets to the triplet manifold; in polar solvents, the molecule forms an intramolecular CT state. The interchromophore interaction stu… more
Date: June 1, 1993
Creator: Lim, E. C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Optically enhanced nuclear cross polarization in acridine-doped fluorene

Description: The objective of this work has been to create large polarizations of the dilute /sup 13/C nuclei in the solid state. The idea was to create /sup 1/H polarizations larger than Boltzmann and to use the proton enhanced nuclear induction spectroscopy cross polarization technique to then transfer this large polarization to the /sup 13/C spin system. Optical Nuclear Polarization (ONP) of acridine-doped fluorene single crystals was studied. In addition, ONP of powdered samples of the acridine-doped fl… more
Date: June 1, 1982
Creator: Oshiro, C. M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Electrochemical Processes for In-situ Treatment of Contaminated Soils

Description: Soils at typical DOE (Department of Energy) waste sites are known to be contaminated by a host of hazardous organic chemicals, heavy metals and radionuclides. Typical hazardous organic contaminants include chlorinated solvents such as trichloroethylene (TCE), tetrachloroethylene (PCE), chloroform, and carbon tetrachloride, and polycyclic aromatic hydrocarbons (PAHs) such as naphthalene, fluorene, phenanthrene, anthracene and pyrene. It is also known that major toxic heavy metals such as Pb, Cr,… more
Date: June 1, 1999
Creator: Huang, C.P. & Cha, Daniel
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Measurement and estimated health risks of semivolatile organic compounds (PCBs, PAHs, pesticides, and phthalates) in ambient air at the Hanford Site

Description: Air samples for polychlorinated biphenyls (PCBs), chlorinated pesticides, phthalate plasticizers, and polycyclic aromatic hydrocarbons (PAHs) were collected at three Hanford Site locations (300-Area South Gate, southeast of 200-East Area, and a background location near Rattlesnake Springs). Samples were collected using high-volume air samplers equipped with a glass fiber filter and polyurethane foam plug sampling train. Target compounds were extracted from the sampling trains and analyzed using… more
Date: September 1, 1997
Creator: Patton, G. W.; Cooper, A. T.; Blanton, M. L.; Lefkovitz, L. F. & Gilfoil, T. J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Resonance ionization spectroscopy of molecules, clusters, and ions. Annual technical progress report

Description: High resolution photoionization and fluorescence excitation spectra of dimers of the aromatic molecule fluorene (C{sub 13}H{sub 12}){sub 2} reveal complex excitonic interactions. Comparison of results for isotopically pure and isotopically mixed dimers provide the information necessary to analyze the spectra in terms of intermolecular motion on two perturbed adiabatic potential surfaces. The intermolecular force field on the lower surface is characterized by a perturbed quartic potential, where… more
Date: July 14, 1993
Creator: Wessel, J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Hydrous pyrolysis of pole treating chemicals: (a) initital measurement of hydrous pyrolysis rates for napthalene and pentachlorophenol; (b) solubility of flourene at temperatures up to 150{degrees}C

Description: The temperature dependencies of the hydrous pyrolysis/oxidation (HPO) aqueous phase oxidation reactions of naphthalene and pentachlorophenol have been determined for phosphate buffered systems using Dickson-type reaction vessels. The HPO experimental temperatures ranged from 114{degrees}C to 148{degrees}C for naphthalene and 114{degrees}C to 137{degrees}C for pentachlorophenol. The loss of the organic species was used to determine activation energies of 95.8 kJ/mole for naphthalene oxidation an… more
Date: November 15, 1997
Creator: Leif, R. N., LLNL
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Multiphoton ionization of ions, neutrals, and clusters. Progress report

Description: Scientific results are summarized from a three year research program on multiphoton ionization in aromatic molecules, clusters, and their ions. As originally proposed, the studies elucidated a new cluster ionization mechanism, characterized properties of long range intermolecular interactions, and investigated electronic transitions of aromatic cations cooled in a supersonic beam. The studies indicate that the new cluster ionization mechanism is highly efficient and dominates conventional 1 + 1… more
Date: June 28, 1991
Creator: Wessel, J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Resonance ionization spectroscopy of molecules, clusters, and ions. Continuation proposal and annual technical progress report

Description: Supersonic beam studies of the dimer of the aromatic molecule fluorene reveal both excitonic and excimer properties. The high resolution spectra obtained for the cold clusters suggests that it will be possible to elucidate the coupling between these types of states. The accumulating evidence indicates that both types of states occur generally for aromatic clusters. Their relative contributions to the spectra are not currently understood. This problem is the emphasis of the ongoing investigation… more
Date: July 10, 1992
Creator: Wessel, J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Supercritical thermodynamics of sulfur and nitrogen species. Quarterly progress report, April 1, 1992--June 30, 1992

Description: Significant opportunity exists for the application of supercritical fluid (SCF) technology to coal processing, both for pretreatment of high sulfur coals, as well as liquefaction and treatment of coal liquids. Supercritical fluids are attractive solvents for a variety of coal processing applications because of their unusual solvating and mass transfer properties. Solubility studies have been carried out for a number of model coal and coal liquid compounds, primarily in pure supercritical fluids… more
Date: October 1, 1991
Creator: Eckert, C. A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Supercritical thermodynamics of sulfur and nitrogen species. Quarterly progress report, April 1, 1992--June 30, 1992

Description: Significant opportunity exists for the application of supercritical fluid (SCF) technology to coal processing, both for pretreatment of high sulfur coals, as well as liquefaction and treatment of coal liquids. Supercritical fluids are attractive solvents for a variety of coal processing applications because of their unusual solvating and mass transfer properties. Solubility studies have been carried out for a number of model coal and coal liquid compounds, primarily in pure supercritical fluids… more
Date: October 1, 1991
Creator: Eckert, C. A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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