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Expression profiling of hypothetical genes in Desulfovibrio vulgaris leads to improved functional annotation
Hypothetical and conserved hypothetical genes account for>30percent of sequenced bacterial genomes. For the sulfate-reducing bacterium Desulfovibrio vulgaris Hildenborough, 347 of the 3634 genes were annotated as conserved hypothetical (9.5percent) along with 887 hypothetical genes (24.4percent). Given the large fraction of the genome, it is plausible that some of these genes serve critical cellular roles. The study goals were to determine which genes were expressed and provide a more functionally based annotation. To accomplish this, expression profiles of 1234 hypothetical and conserved genes were used from transcriptomic datasets of 11 environmental stresses, complemented with shotgun LC-MS/MS and AMT tag proteomic data. Genes were divided into putatively polycistronic operons and those predicted to be monocistronic, then classified by basal expression levels and grouped according to changes in expression for one or multiple stresses. 1212 of these genes were transcribed with 786 producing detectable proteins. There was no evidence for expression of 17 predicted genes. Except for the latter, monocistronic gene annotation was expanded using the above criteria along with matching Clusters of Orthologous Groups. Polycistronic genes were annotated in the same manner with inferences from their proximity to more confidently annotated genes. Two targeted deletion mutants were used as test cases to …
Date:
October 27, 2008
Creator:
Elias, Dwayne A.; Mukhopadhyay, Aindrila; Joachimiak, Marcin P.; Drury, Elliott C.; Redding, Alyssa M.; Yen, Huei-Che B. et al.
Object Type:
Article
System:
The UNT Digital Library
Long Baseline Neutrino Beams and Large Detectors
It is amazing to acknowledge that in roughly 70 years from when the existence of the neutrino was postulated, we are now contemplating investigating the mysteries of this particle (or particles) requiring and utilizing detectors of 300 ktons , distances of 1,000-2,000 kilometers, beam intensities of megawatts and underground depth of 5,000 feet. This evolution has evolved slowly, from the experimental discovery of the neutrino in 1956, to the demonstration that there were two neutrinos in 1962 and three and only three by 1991. The great excitement occurred in the 2000's coming from the study of solar and atmospheric neutrinos in which neutrinos were observed to oscillate and therefore have mass. Although the absolute mass of any of the neutrinos has yet to be determined (the upper limit is less than I electron volt) the difference in this square of these masses has been measured, yielding a value of (2.3 {+-} .2) 10{sup -3} ev{sup 2} for atmospheric neutrinos and (7.6 {+-} .2) 10{sup -5} ev{sup 2} for solar neutrinos. In addition their mixing angles were found to be 45{sup o} for atmospheric neutrinos and 34{sup o} for solar neutrinos. This present state of knowledge on neutrinos is pictorially displayed …
Date:
October 27, 2008
Creator:
Samios, N. P.
Object Type:
Article
System:
The UNT Digital Library
Simulated Waste for Leaching and Filtration Studies--Laboratory Preparation Procedure
This report discusses the simulant preparation procedure for producing multi-component simulants for leaching and filtration studies, including development and comparison activities in accordance with the test plan( ) prepared and approved in response to the Test Specification 24590-WTP-TSP-RT-06-006, Rev 0 (Smith 2006). A fundamental premise is that this approach would allow blending of the different components to simulate a wide variety of feeds to be treated in the Hanford Tank Waste Treatment and Immobilization Plant (WTP). For example, a given feed from the planned feed vector could be selected, and the appropriate components would then be blended to achieve a representation of that particular feed. Using the blending of component simulants allows the representation of a much broader spectrum of potential feeds to the Pretreatment Engineering Platform (PEP).
Date:
October 27, 2009
Creator:
Smith, Harry D.; Russell, Renee L. & Peterson, Reid A.
Object Type:
Report
System:
The UNT Digital Library
Brownfields and Superfund Issues in the 108th Congress
This report discusses the Superfund program for cleaning up the nation's worst hazardous waste sites, created by the Comprehensive Environmental Response, Compensation, and Liability Act of 1980, or CERCLA (P.L. 96-510, as amended). It includes recent development and background issues, superfund issues, revenue issues, comprehensive reauthorization, and legislation regarding superfund program.
Date:
October 27, 2004
Creator:
Reisch, Mark
Object Type:
Report
System:
The UNT Digital Library
[TAMS alumni and photographer at Homecoming 2007]
A photograph of TAMS Alumni and a photographer by some large TAMS letters at UNT's 2007 Homecoming. There are tents, other people and a building behind them.
Date:
October 27, 2007
Creator:
University of North Texas. Center for Media Production.
Object Type:
Photograph
System:
The UNT Digital Library
[TAMS alumni group from side at Homecoming 2007]
A photograph of TAMS Alumni standing behind large TAMS letters at UNT's 2007 Homecoming. There are tents and other letter stands behind them.
Date:
October 27, 2007
Creator:
University of North Texas. Center for Media Production.
Object Type:
Photograph
System:
The UNT Digital Library
[Two TAMS alumni at Homecoming 2007]
A photograph of two TAMS alumni standing behind the big TAMS letters at the 2007 UNT Homecoming events. There are tents, balloons, other people, and a building behind them.
Date:
October 27, 2007
Creator:
University of North Texas. Center for Media Production.
Object Type:
Photograph
System:
The UNT Digital Library
[Two TAMS alumni at the 2007 UNT Homecoming]
A photograph of two TAMS alumni standing behind the big TAMS letters at the 2007 UNT Homecoming events. There are tents, balloons, other people, and a building behind them.
Date:
October 27, 2007
Creator:
University of North Texas. Center for Media Production.
Object Type:
Photograph
System:
The UNT Digital Library
[TAMS alumni at Homecoming 2007]
A photograph of TAMS Alumni standing behind large TAMS letters at UNT's 2007 Homecoming. There are tents and a building behind them and balloons are attached to their tent.
Date:
October 27, 2007
Creator:
University of North Texas. Center for Media Production.
Object Type:
Photograph
System:
The UNT Digital Library
[TAMS alumni group from below at Homecoming 2007]
A photograph of TAMS Alumni standing behind large TAMS letters at UNT's 2007 Homecoming. There are tents and other people past them.
Date:
October 27, 2007
Creator:
University of North Texas. Center for Media Production.
Object Type:
Photograph
System:
The UNT Digital Library
[TAMS alumni group at Homecoming 2007]
A photograph of TAMS Alumni standing behind large TAMS letters at UNT's 2007 Homecoming. There are tents and a building behind them and balloons are attached to their tent.
Date:
October 27, 2007
Creator:
University of North Texas. Center for Media Production.
Object Type:
Photograph
System:
The UNT Digital Library
[Large TAMS alumni group at Homecoming 2007]
A photograph of TAMS Alumni standing behind large TAMS letters at UNT's 2007 Homecoming. There are tents behind them and balloons are decorating the one for the alumni reception.
Date:
October 27, 2007
Creator:
University of North Texas. Center for Media Production.
Object Type:
Photograph
System:
The UNT Digital Library
Sunlight Responsive Thermochromic Window System
Pleotint has embarked on a novel approach with our Sunlight Responsive Thermochromic, SRT™, windows. We are integrating dynamic sunlight control, high insulation values and low solar heat gain together in a high performance window. The Pleotint SRT window is dynamic because it reversibly changes light transmission based on thermochromics activated directly by the heating effect of sunlight. We can achieve a window package with low solar heat gain coefficient (SHGC), a low U value and high insulation. At the same time our windows provide good daylighting. Our innovative window design offers architects and building designers the opportunity to choose their desired energy performance, excellent sound reduction, external pane can be self-cleaning, or a resistance to wind load, blasts, bullets or hurricanes. SRT windows would provide energy savings that are estimated at up to 30% over traditional window systems. Glass fabricators will be able to use existing equipment to make the SRT window while adding value and flexibility to the basic design. Glazing installers will have the ability to fit the windows with traditional methods without wires, power supplies and controllers. SRT windows can be retrofit into existing buildings,
Date:
October 27, 2006
Creator:
Millett, F,A & Byker,H, J
Object Type:
Report
System:
The UNT Digital Library
Quantitative experiments with electrons in a positively chargedBeam
None
Date:
October 27, 2006
Creator:
Molvik, A. W.; Vay, J. L.; Kireef Covo, M.; Cohen, R.; Baca, D.; Bieniosek, F. et al.
Object Type:
Article
System:
The UNT Digital Library
Stability Of Plasma Configurations During Compression
Magnetized Target Fusion (MTF) efforts are based on calculations showing that the addition of a closed magnetic field reduces the driver pressure and rise time requirements for inertial confinement fusion by reducing thermal conductivity. Instabilities that result in convective bulk transport at the Alphen time scale are of particular concern since they are much faster than the implosion time. Such instabilities may occur during compression due to, for example, an increase in the plasma-magnetic pressure ratio {beta} or, in the case of a rotating plasma, spin-up due to angular momentum conservation. Details depend on the magnetic field topology and compression geometry. A hard core z pinch with purely azimuthal magnetic field can theoretically be made that relaxes into a wall supported diffuse profile satisfying the Kadomtsev criterion for the stability of m = 0 modes, which is theoretically preserved during cylindrical outer wall compression. The center conductor radius and current must also be large enough to keep the {beta} below stability limits to stabilize modes with m > 0. The stability of m > 0 modes actually improves during compression. A disadvantage of this geometry, though, is plasma contact with the solid boundaries. In addition to the risk of high …
Date:
October 27, 2006
Creator:
Ruden, E L & Hammer, J H
Object Type:
Article
System:
The UNT Digital Library
Cooperative Research in C1 Chemistry
None
Date:
October 27, 2001
Creator:
Huffman, Gerald P.
Object Type:
Report
System:
The UNT Digital Library
Cooperative Research in C1 Chemistry
C1 chemistry refers to the conversion of simple carbon-containing materials that contain one carbon atom per molecule into valuable products. The feedstocks for C1 chemistry include natural gas, carbon dioxide, carbon monoxide, methanol and synthesis gas (a mixture of carbon monoxide and hydrogen). Synthesis gas, or syngas, is produced primarily by the reaction of natural gas, which is principally methane, with steam. It can also be produced by gasification of coal, petroleum coke, or biomass. The availability of syngas from coal gasification is expected to increase significantly in the future because of increasing development of integrated gasification combined cycle (IGCC) power generation. Because of the abundance of remote natural gas, the advent of IGCC, and environmental advantages, C1 chemistry is expected to become a major area of interest for the transportation fuel and chemical industries in the relatively near future. The CFFLS will therefore perform a valuable national service by providing science and engineering graduates that are trained in this important area. Syngas is the source of most hydrogen. Approximately 10 trillion standard cubic feet (SCF) of hydrogen are manufactured annually in the world. Most of this hydrogen is currently used for the production of ammonia and in a variety …
Date:
October 27, 2000
Creator:
Huffman, Gerald P.
Object Type:
Report
System:
The UNT Digital Library
Advancing the Ion Beam Thin Film Planarization Process for the Smoothing of Substrate Particles
This report addresses the advancement of the ion beam thin film planarization process for the smoothing of substrate particles.
Date:
October 27, 2004
Creator:
Mirkarimi, P.; Spiller, E.; Baker, S.; Robinson, J.; Stearns, D.; Liddle, J. A. et al.
Object Type:
Article
System:
The UNT Digital Library
High-Intensity Plasma Glass Melter Final Technical Report
The purpose of this project was to demonstrate the energy efficiency and reduced emissions that can be obtained with a dual torch DC plasma transferred arc-melting system. Plasmelt Glass Technologies, LLC was formed to solicit and execute the project, which utilize a full-scale test melter system. The system is similar to the one that was originally constructed by Johns Manville, but Plasmelt has added significant improvements to the torch design and melter system that has extended the original JM short torch lives. The original JM design has been shown to achieve melt rates 5 to 10 times faster than conventional gas or electric melting, with improved energy efficiency and reduced emissions. This project began on 7/28/2003 and ended 7/27/06. A laboratory scale melter was designed, constructed, and operated to conduct multiple experimental melting trials on various glass compositions. Glass quality was assessed. Although the melter design is generic and equally applicable to all sectors within the glass industry, the development of this melter has focused primarily on fiberglass with additional exploratory melting trials of frits, specialty, and minerals-melting applications. Throughput, energy efficiency, and glass quality have been shown to be heavily dependent on the selected glass composition. During this project, …
Date:
October 27, 2006
Creator:
Gonterman, J. Ronald & Weinstein, Michael A.
Object Type:
Report
System:
The UNT Digital Library
Scrape-Off Layer Transport and Deposition Studies in DIII-D
Trace {sup 13}CH{sub 4} injection experiments into the main scrape-off layer of low density L-mode and high-density H-mode plasmas have been performed in the DIII-D tokamak [Luxon{_}NF02] to mimic the transport and deposition of carbon arising from a main chamber sputtering source. These experiments indicated entrainment of the injected carbon in plasma flow in the main SOL, and transport toward the inner divertor. Ex-situ surface analysis showed enhanced {sup 13}C surface concentration at the corner formed by the divertor floor and the angled target plate of the inner divertor in L-mode; in H-mode, both at the corner and along the surface bounding the private flux region inboard of the outer strike point. Interpretative modeling was made consistent with these experimental results by imposing a parallel carbon ion flow in the main SOL toward the inner target, and a radial pinch toward the separatrix. Predictive modeling carried out to better understand the underlying plasma transport processes suggests that the deuterium flow in the main SOL is related to the degree of detachment of the inner divertor leg. These simulations show that carbon ions are entrained with the deuteron flow in the main SOL via frictional coupling, but higher charge state carbon …
Date:
October 27, 2006
Creator:
Groth, M.; Allen, S.; Boedo, J.; Brooks, N.; Elder, J.; Fenstermacher, M. et al.
Object Type:
Article
System:
The UNT Digital Library
Sub-Nanostructured Non Transition Metal Complex Grids for Hydrogen Storage
This project involved growing sub-nanostructured metal grids to increase dynamic hydrogen storage capacity of metal hydride systems. The nano particles of any material have unique properties unlike its bulk form. Nano-structuring metal hydride materials can result in: {sm_bullet}Increased hydrogen molecule dissociation rate, {sm_bullet} Increased hydrogen atom transport rate, {sm_bullet} Decreased decrepitation caused by cycling, {sm_bullet} Increased energy transfer in the metal matrix, {sm_bullet} Possible additional contribution by physical adsorption, and {sm_bullet} Possible additional contribution by quantum effects The project succeeded in making nano-structured palladium using electrochemical growth in templates including zeolites, mesoporous silica, polycarbonate films and anodized alumina. Other metals were used to fine-tune the synthesis procedures. Palladium was chosen to demonstrate the effects of nano-structuring since its bulk hydrogen storage capacity and kinetics are well known. Reduced project funding was not sufficient for complete characterization of these materials for hydrogen storage application. The project team intends to seek further funding in the future to complete the characterization of these materials for hydrogen storage.
Date:
October 27, 2007
Creator:
Talu, Dr. Orhan & Tewari, Dr. Surendra N.
Object Type:
Report
System:
The UNT Digital Library
Performance Confirmation Data Aquisition System
The purpose of this analysis is to identify and analyze concepts for the acquisition of data in support of the Performance Confirmation (PC) program at the potential subsurface nuclear waste repository at Yucca Mountain. The scope and primary objectives of this analysis are to: (1) Review the criteria for design as presented in the Performance Confirmation Data Acquisition/Monitoring System Description Document, by way of the Input Transmittal, Performance Confirmation Input Criteria (CRWMS M&O 1999c). (2) Identify and describe existing and potential new trends in data acquisition system software and hardware that would support the PC plan. The data acquisition software and hardware will support the field instruments and equipment that will be installed for the observation and perimeter drift borehole monitoring, and in-situ monitoring within the emplacement drifts. The exhaust air monitoring requirements will be supported by a data communication network interface with the ventilation monitoring system database. (3) Identify the concepts and features that a data acquisition system should have in order to support the PC process and its activities. (4) Based on PC monitoring needs and available technologies, further develop concepts of a potential data acquisition system network in support of the PC program and the Site Recommendation …
Date:
October 27, 2000
Creator:
Markman, D. W.
Object Type:
Report
System:
The UNT Digital Library
Quantitative Experiments With Electrons in a Positively Charged Beam
Intense ion beams are an extreme example of, and difficult to maintain as, a non-neutral plasma. Experiments and simulations are used to study the complex interactions between beam ions and (unwanted) electrons. Such ''electron clouds'' limit the performance of many accelerators. To characterize electron clouds, a number of parameters are measured including: total and local electron production and loss for each of three major sources, beam potential versus time, electron line-charge density, and gas pressure within the beam. Electron control methods include surface treatments to reduce electron and gas emission, and techniques to remove, or block, electrons from the beam. Detailed, self-consistent simulations include beam-transport fields, and electron and gas generation and consistent transport, to compute unexpectedly rich behavior, much of which is confirmed experimentally. For example, in a quadrupole magnetic field, ion and dense electron plasmas interact to produce multi-kV oscillations in the electron plasma and distortions of the beam velocity space distribution, without becoming homogenous or locally neutral.
Date:
October 27, 2006
Creator:
Molvik, A W; Vay, J; Covo, M K; Cohen, R; Baca, D; Bieniosek, F et al.
Object Type:
Article
System:
The UNT Digital Library
Lexington Observer (Lexington, Okla.), Vol. 10, No. 29, Ed. 1 Thursday, October 27, 2005
Weekly newspaper from Lexington, Oklahoma that includes local, state, and national news along with advertising.
Date:
October 27, 2005
Creator:
Edwards, Olvis
Object Type:
Newspaper
System:
The Gateway to Oklahoma History