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Human retroviruses and AIDS 1994

Description: This compendium, including accompanying floppy diskettes, is the result of an effort to compile and rapidly publish all relevant molecular data concerning the human immunodeficiency viruses (HIV) and related retroviruses. The scope of the compendium and database is best summarized by the five parts it comprises: (I) Nucleic Acid Alignments and Sequences; (II) Amino Acid Alignments; (III) Analysis; (IV) Related Sequences; (V) Database communications.
Date: January 1, 1995
Creator: Myers, G.; Korber, B.; Wain-Hobson, S.; Jeang, Kuan-Teh; Henderson, L. E. & Pavlakis, G. N.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Site Directed Mutagenesis of Dienelactone Hydrolase

Description: The clcD gene encoding dienelactone hydrolase (DLH) is part of the clc gene cluster for the utilization of the B-ketoadipate pathway intermediate chlorocatechol. The roles that individual amino acids residues play in catalysis and binding of the enzyme were investigated. Using PCR a 1.9 kbp clcD fragment was amplified and subcloned yielding a 821 bp BamHi to ZscoRI subclone in the plasmid pUC19.
Date: August 1995
Creator: Al-Khatib, Haifa Yousef
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries
open access

Wetland treatment of oil and gas well waste waters. Final report

Description: Constructed wetlands are small on-site systems that possess three of the most desirable components of an industrial waste water treatment scheme: low cost, low maintenance and upset resistance. The main objective of the present study is to extend the knowledge base of wetland treatment systems to include processes and substances of particular importance to small, on-site systems receiving oil and gas well wastewaters. A list of the most relevant and comprehensive publications on the design of w… more
Date: August 1, 1995
Creator: Kadlec, R. & Srinivasan, K.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Structures and shear response of lipid monolayers. Progress report, August 1, 1993--January 31, 1996

Description: Of the many systems now classified as {open_quotes}soft condensed matter{close_quotes}, lipids are some of the best known and most studied. Lipids occur most commonly in membranes, but the artificially created lipid systems known as Langmuir films (on water) and Langmuir-Blodgett films (on solid substrates) are in some ways better-defined and more easily controlled systems with which to address many of the same questions. Studies of these systems have a long and distinguished history, but in th… more
Date: August 1, 1995
Creator: Dutta, P. & Ketterson, J.B.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Approaches for regeneration of amine-carboxylic acid extracts

Description: Extraction processes based on reversible chemical complexation can be useful for separation of polar organics from dilute solution. Tertiary amines are effective extractants for the recovery of carboxylic acids from aqueous solution. The regeneration of aminecarboxylic acid extracts is an important step which strongly influences the economic viability of the separation process. Several regeneration methods are critically reviewed, and the factors that affect swing regeneration processes, includ… more
Date: July 1, 1995
Creator: Dai, Y. & King, C. J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Microbial degradation of low-level radioactive waste. Volume 2, Annual report for FY 1994

Description: The Nuclear Regulatory Commission stipulates in 10 CFR 61 that disposed low-level radioactive waste (LLW) be stabilized. To provide guidance to disposal vendors and nuclear station waste generators for implementing those requirements, the NRC developed the Technical Position on Waste Form, Revision 1. That document details a specified set of recommended testing procedures and criteria, including several tests for determining the biodegradation properties of waste forms. Cement has been widely u… more
Date: August 1, 1995
Creator: Rogers, R.D.; Hamilton, M.A.; Veeh, R.H. & McConnell, J.W. Jr.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Development of biological coal gasification (MicGAS Process). Quarterly report, January--March 1995

Description: This paper reports on the progress of several subtasks of the project. Another test with dual bioreactors was started to confirm the results obtained previously. Coal samples from the experiment in upflow bioreactors were characterized for mineral content. Solid residues from the bioreactor experiment were analyzed for humic acid content. Results are given for all three investigations.
Date: April 1, 1995
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Selective extraction of trivalent actinides from lanthanides with dithiophosphinic acids and tributylphosphate

Description: A variety of chemical systems have been developed to separate trivalent actinides from lanthanides based on the slightly stronger complexation of the trivalent actinides with ligands that contain soft donor atoms. The greater stability of the actinide complexes in these systems has often been attributed to a slightly greater covalent bonding component for the actinide ions relative to the lanthanide ions. The authors have investigated several synergistic extraction systems that use ligands with… more
Date: January 1, 1995
Creator: Jarvinen, G.; Barrans, R.; Schroeder, N.; Wade, K.; Jones, M.; Smith, B. F. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Identification and characterization of conservative organic tracers for use as hydrologic tracers for the Yucca Mountain Site Characterization study. [Quarterly] progress report, April 1, 1995--June 3, 1995

Description: The focus for this quarter has been on completing the laboratory studies in preparation for the C-Well tracer tests. These studies include measuring the solubilities for each of the fluorinated benzoic acids as well as determining the stabilities of these compounds through both batch and column testing. A batch test for four pyridone compounds was also initiated. The Tracer QA procedures were approved by the YM USGS on May 24, 1995. The batch testing was repeated using these procedures.
Date: August 1995
Creator: Stetzenbach, Klaus & Farnham, Irene
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Identification of subsurface microorganisms at Yucca Mountain. Quarterly report, July 1, 1995--September 30, 1995

Description: More than 1100 bacterial isolates were obtained over a two year period from 31 springs in a region along the southern boarder of California and Nevada. Water samples were collected from 17 springs in Ash Meadows National Wildlife Refuge and 14 springs in Death Valley National Park. Bacteria isolated from these samples were subjected to extraction and gas chromatography to determine the cellular fatty acid profile of each isolate. Fatty acid methyl esters (FAME) extracted from cell membranes wer… more
Date: December 1, 1995
Creator: Stetzenbach, Linda D.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Evaluation of the humidification requirements of new proton exchange membranes for fuel cells

Description: Measurements of PEM fuel cell device performance were made with different gas inlet temperatures and relative humidity using a newly-designed test fixture. Significant improvement in device performance was observed when the fuel inlet temperature was increased above the operating temperature of the cell. These measurements were then correlated to a model to describe energy and mass transport processes. Proton exchange membrane (PEM), fuel cells--the focus of this study--use an ion conducting po… more
Date: May 1, 1995
Creator: Grot, Stephen A.; Hedstrom, James C. & Vanderborgh, Nicholas E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Characterization of the interaction of uranyl ions with humic acids by x-ray absorption spectroscopy

Description: Humic substances are present throughout the environment in soil and natural water. They are organic macromolecules with a variable structural formula, molecular weight, and a wide variety of functional groups depending on their origin. In natural waters, humic substances represent the main component of the {open_quotes}dissolved organic carbon{close_quotes} (DOC). The DOC may vary considerably from 1 mg/L at sea water surfaces to 50 mg/L at the surface in dark water swamps. There is strong evid… more
Date: November 1, 1995
Creator: Reich, T.; Denecke, M. A. & Pompe, S.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Nuclear medicine program progress report for quarter ending December 31, 1995

Description: In this report we describe the first resolution of the 3R-(+)-and 3S- ({minus})-methyl BMIPP methyl-branched fatty acid stereoisomers and biodistribution of the radioiodinated isomers in rats to investigate the effects of the configuration of the 3({beta})-methyl group on the organ distribution and myocardial uptake and release kinetics. Synthesesis of 3R-(+)BMIPP was accompanied by initial acylation of the thiophene template with the acid chloride of ethyl 3R- methylglutarate. The amide of the… more
Date: December 31, 1995
Creator: Knapp, F. F., Jr.; Ambrose, K. R.; Beets, A. L.; Luo, H.; McPherson, D. W.; Mirzadeh, S. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Oxidation of Coal and Coal Pyrite Mechanisms and Influence on Surface Characteristics. Technical Progress Report, May 31, 1995

Description: The objective of this research is to develop a mechanistic understanding of the oxidation of coal and coal pyrite, and to correlate the intrinsic physical and chemical properties of these minerals, along with changes resulting from oxidation, with those surface properties that influence the behavior in physical cleaning processes. Work during the nineteenth quarter has concluded studies of the surface functional groups produced on coal by severe thermal and chemical oxidation, and on investigat… more
Date: December 31, 1995
Creator: Doyle, F. M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Computational studies of water adsorption in zeolites

Description: We have performed high-level ab initio calculations using Hartree-Fock (HF) theory, Moller-Plesset perturbation theory (MP2), and density-functional theory (DFT) to study the geometry and energetics of the adsorption complex involving H{sub 2}O and the Bronsted acid site in the zeolite H-ZSM-5. These calculations use aluminosilicate cluster models for the zeolite framework with as many as 28 T atoms (T=Si, Al). We included geometry optimization in the local vicinity of the acid site at the MP2 … more
Date: May 1, 1995
Creator: Zygmunt, S.A.; Curtiss, L.A. & Iton, L.E.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Detecting and Quantifying Lewisite Degradation Products in Environmental Samples Using Arsenic Speciation

Description: This report describes a unique method for identifying and quantifying lewisite degradation products using arsenic (III) and arsenic (IV) speciation in solids and in solutions. Gas chromatographic methods, as well as high-performance liquid chromatographic methods are described for separation of arsenic species. Inductively coupled plasma-mass spectrographic methods are presented for the detection of arsenic.
Date: December 31, 1995
Creator: Bass, Dean A.; Yaeger, Judith S.; Kiely, James T.; Crain, Jeffrey S.; Shem, Linda M.; O`Neill, Hugh J. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Development of vanadium-phosphate catalysts for methanol production by selective oxidation of methane. Quarterly technical progress report No. 9, April 1995--June 1995

Description: This document is the ninth quarterly technical progress report under Contract No. DE-AC22-92PC92110 {open_quotes}Development of Vanadium-Phosphate Catalysts for Methanol Production by Selective Oxidation of Methane{close_quotes}. Activities were focused on fine tuning of the microreactor system by elimination of transport effects and improvements in the analytical system. Process variable studies were conducted on vanadyl pyrophosphate and screening studies were conducted on several modified ca… more
Date: September 14, 1995
Creator: McCormick, R.L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

The computational linguistics of biological sequences

Description: This tutorial was one of eight tutorials selected to be presented at the Third International Conference on Intelligent Systems for Molecular Biology which was held in the United Kingdom from July 16 to 19, 1995. Protein sequences are analogous in many respects, particularly their folding behavior. Proteins have a much richer variety of interactions, but in theory the same linguistic principles could come to bear in describing dependencies between distant residues that arise by virtue of three-d… more
Date: December 31, 1995
Creator: Searls, D.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Method for separating constituents from solution employing a recyclable Lewis acid metal-hydroxy gel

Description: This invention permits radionuclides, heavy metals, and organics to be extracted from solution by scavenging them with an amorphous gel. In the preferred embodiment, a contaminated solution (e.g. from soil washing, decontamination, or groundwater pumping) is transferred to a reaction vessel. The contaminated solution is contacted by the sequestering reagent which might contain for example, aluminate and EDTA anions in a 2.5 M NaOH solution. The pH of the reagent bearing solution is lowered on c… more
Date: December 31, 1995
Creator: Alexander, D. H.
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department
open access

Computational studies of Bronsted acid sites in zeolites

Description: The authors have performed high-level ab initio calculations using both Hartree-Fock (HF) and Moller-Plesset perturbation theory (MP2) to study the geometry and energetics of the adsorption complex involving H{sub 2}O and the Bronsted acid site in the zeolite H-ZSM-5. In these calculations, which use aluminosilicate cluster models for the zeolite framework with as many a 28 T atoms (T = Si, Al), we included geometry optimization in the local vicinity of the acid site at the HF/6-31G(d) level of… more
Date: January 1, 1995
Creator: Curtiss, L.A.; Iton, L.E. & Zygmunt, S.A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Vapor pressures and heats of vaporization of primary coal tars. Quarterly technical progress report, July 1--September 30, 1995

Description: There is significant current interest in general area of coal pyrolysis, particularly because of the central role of pyrolysis in all thermally driven coal conversion processes-gasification, combustion, liquefaction, mild gasification, or thermal beneficiation. There remain several key data needs in these application areas. Among them is a need for more reliable correlation for prediction of vapor pressure of heavy, primary coal tars. The vapor pressure correlations that exist at present for co… more
Date: December 31, 1995
Creator: Suuberg, E.M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Characterization and reactivity of organic monolayers on gold and platinum surfaces

Description: Purpose is to understand how the mobilization, dielectric, orientation, composition, coverage, and structure of self-assembled organic monolayers on metal surfaces affects the surface reactivities and properties of these films in order to facilitate the construction of desired films. Two model systems were used: tiols at Au and aromatic acids at Pt. Surface analysis methods, including contact angle, electrochemistry, ellipsometry, infrared reflection absorption spectroscopy (IRRAS), and x-ray p… more
Date: December 6, 1995
Creator: Wu, Chien-Ching
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries Government Documents Department
open access

Diphonix{trademark} Resin: A review of its properties and applications

Description: The recently developed Diphonix{trademark} resin is a new multifunctional chelating ion exchange resin containing seminally substituted diphosphonic acid ligands chemically bonded to a styrene-based polymeric matrix. Diphonix can be regarded as a dual mechanism polymer, with a sulfonic acid cation exchange group allowing for rapid access, mostly non-specific, of ions into the polymeric network, and the diphosphonic acid group responsible for specificity (recognition) for a number of metal catio… more
Date: December 31, 1995
Creator: Chiarizia, R.; Horwitz, E.P.; Alexandratos, S.D. & Gula, M.J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Development of vanadium-phosphate catalysts for methanol production by selective oxidation of methane. Quarterly technical progress report 10, July 1, 1995--September 31, 1995

Description: This document is the tenth quarterly technical progress report under Contract No. DE-AC22-92PC92110 {open_quotes}Development of Vanadium-Phosphate Catalysts for Methanol Production by Selective Oxidation of Methane{close_quotes}. Activities focused on testing of additional modified and promoted catalysts and characterization of these materials. Attempts at improving the sensitivity of our GC based analytical systems were also made with some success. Methanol oxidation studies were initiated. Th… more
Date: December 7, 1995
Creator: McCormick, R.L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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