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3-Nitropropionic Acid is a Suicide Inhibitor of MitochondrialRespiration that, Upon Oxidation by Complex II, Forms a Covalent AdductWith a Catalytic Base Arginine in the Active Site of the Enzyme
We report three new structures of mitochondrial respiratory Complex II (succinate ubiquinone oxidoreductase, E.C. 1.3.5.1) at up to 2.1 {angstrom} resolution, with various inhibitors. The structures define the conformation of the bound inhibitors and suggest the residues involved in substrate binding and catalysis at the dicarboxylate site. In particular they support the role of Arg297 as a general base catalyst accepting a proton in the dehydrogenation of succinate. The dicarboxylate ligand in oxaloacetate-containing crystals appears to be the same as that reported for Shewanella flavocytochrome c treated with fumarate. The plant and fungal toxin 3-nitropropionic acid, an irreversible inactivator of succinate dehydrogenase, forms a covalent adduct with the side chain of Arg297. The modification eliminates a trypsin cleavage site in the flavoprotein, and tandem mass spectroscopic analysis of the new fragment shows the mass of Arg 297 to be increased by 83 Da and to have potential of losing 44 Da, consistent with decarboxylation, during fragmentation.
Date:
December 1, 2005
Creator:
Huang, Li-shar; Sun, Gang; Cobessi, David; Wang, Andy C.; Shen,John T.; Tung, Eric Y. et al.
Object Type:
Article
System:
The UNT Digital Library
2nd High-Level Meeting on Health and Environment in ASEAN and East Asian Countries
The Second High-Level Meeting on Environment and Health in ASEAN and East Asian countries was held in Bangkok, Thailand during 12-13 December 2005. The meeting follows a continuation of the process, which began in Manila in November 2004, where a regional initiative on environment and health was launched by ADB, WHO, and UNEP. It was attended by Representatives from Government and International Agencies and Institutions. The List of Participants is attached as Annexure 2
Date:
October 2010
Creator:
unknown
Object Type:
Text
System:
The UNT Digital Library
Abilene Philharmonic Playbill: December 3-January 14, 2006
Program for an Abilene Philharmonic concert that ran from December 3rd to January 14th (Pop I and Classical III) during the 56th season. It includes information about the pieces performed, artists and musicians, and advertising from local companies.
Date:
December 2005
Creator:
Abilene Philharmonic
Object Type:
Pamphlet
System:
The Portal to Texas History
Accelerator systems and instrumentation for the NuMI neutrino beam
None
Date:
December 1, 2005
Creator:
Zwaska, Robert Miles
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Adaptive mesh refinement for time-domain electromagnetics using vector finite elements :a feasibility study.
This report investigates the feasibility of applying Adaptive Mesh Refinement (AMR) techniques to a vector finite element formulation for the wave equation in three dimensions. Possible error estimators are considered first. Next, approaches for refining tetrahedral elements are reviewed. AMR capabilities within the Nevada framework are then evaluated. We summarize our conclusions on the feasibility of AMR for time-domain vector finite elements and identify a path forward.
Date:
December 1, 2005
Creator:
Turner, C. David; Kotulski, Joseph Daniel & Pasik, Michael Francis
Object Type:
Report
System:
The UNT Digital Library
Adequate Yearly Progress (AYP): Might Growth Models Be Allowed Under the No Child Left Behind Act?
The Environmental Protection Agency (EPA) is currently engaged in a series of regulatory actions to address the transport of ozone pollution in the eastern United States. This report reviews this situation with respect to an EPA-proposed Ozone Transport Rule and other activities.
Date:
December 1, 2005
Creator:
Riddle, Wayne C.
Object Type:
Report
System:
The UNT Digital Library
Adhesive Testing for the BTeV Pixel Detector
The basic unit of the BTeV pixel detector is a multi-chip module which is comprised of a silicon sensor module bump-bonded to a number of readout chips. The pixel module will then be glued to a high intensity interconnect (HDI) cable using electrically conductive adhesive, and then onto a substrate using another kind of adhesive with reasonable thermal conductivity. This report is mostly addressed to the need of the latter--the substrate adhesive. The aim of this technical note is to summarize the testing efforts and results of this substrate adhesive covering a period since 2001 till the end of 2004. The substrate will serve two purposes: mechanical support and cooling of the modules. Stresses and strains will be generated when there is a thermal change on the substrate. In addition, since there are many kinds of materials, with different coefficient of thermal expansion (CTE), being glued together to form the complete detector assembly, the substrate may get distorted due to the CTE mismatches. As stress is directly proportional to the material modulus, a significant amount of effort was concentrated in understanding the adhesive modulus. There are other constraints which need to be considered as well. For instance, the detector will …
Date:
December 1, 2005
Creator:
Lei, C. M.; Kwan, Simon; Hicks, D.; Hahn, Eileen; Hoffman, Jay; Austin, Sharon et al.
Object Type:
Report
System:
The UNT Digital Library
Advanced Extraction Methods for Actinide/Lanthanide Separations
The separation of An(III) ions from chemically similar Ln(III) ions is perhaps one of the most difficult problems encountered during the processing of nuclear waste. In the 3+ oxidation states, the metal ions have an identical charge and roughly the same ionic radius. They differ strictly in the relative energies of their f- and d-orbitals, and to separate these metal ions, ligands will need to be developed that take advantage of this small but important distinction. The extraction of uranium and plutonium from nitric acid solution can be performed quantitatively by the extraction with the TBP (tributyl phosphate). Commercially, this process has found wide use in the PUREX (plutonium uranium extraction) reprocessing method. The TRUEX (transuranium extraction) process is further used to coextract the trivalent lanthanides and actinides ions from HLLW generated during PUREX extraction. This method uses CMPO [(N, N-diisobutylcarbamoylmethyl) octylphenylphosphineoxide] intermixed with TBP as a synergistic agent. However, the final separation of trivalent actinides from trivalent lanthanides still remains a challenging task. In TRUEX nitric acid solution, the Am(III) ion is coordinated by three CMPO molecules and three nitrate anions. Taking inspiration from this data and previous work with calix[4]arene systems, researchers on this project have developed a …
Date:
December 1, 2005
Creator:
Scott, M. J.
Object Type:
Report
System:
The UNT Digital Library
Advanced microscopy :time-resolved multi-spectral imaging of single biomolecules.
Over the past few years we have developed the ability to acquire images through a confocal microscope that contain, for each pixel, the simultaneous fluorescence lifetime and spectra of multiple fluorophores within that pixel. We have demonstrated that our system has the sensitivity to make these measurements on single molecules. The spectra and lifetimes of fluorophores bound to complex molecules contain a wealth of information on the conformational dynamics and local chemical environments of the molecules. However, the detailed record of spectral and temporal information our system provides from fluorophores in single molecules has not been previously available. Therefore, we have studied several fluorophores and simple fluorophore-molecule systems that are representative of the use of fluorophores in biological systems. Experiments include studies of a simple fluorescence resonance energy transfer (FRET) system, green fluorescent probe variants and quantum dots. This work is intended to provide a basis for understanding how fluorophores report on the chemistry of more complex biological molecules.
Date:
December 1, 2005
Creator:
Hayden, Carl C.; Chandler, David W.; Gradinaru, Claudiu C. & Luong, A. Khai
Object Type:
Report
System:
The UNT Digital Library
Advanced proton-exchange materials for energy efficient fuel cells.
The ''Advanced Proton-Exchange Materials for Energy Efficient Fuel Cells'' Laboratory Directed Research and Development (LDRD) project began in October 2002 and ended in September 2005. This LDRD was funded by the Energy Efficiency and Renewable Energy strategic business unit. The purpose of this LDRD was to initiate the fundamental research necessary for the development of a novel proton-exchange membranes (PEM) to overcome the material and performance limitations of the ''state of the art'' Nafion that is used in both hydrogen and methanol fuel cells. An atomistic modeling effort was added to this LDRD in order to establish a frame work between predicted morphology and observed PEM morphology in order to relate it to fuel cell performance. Significant progress was made in the area of PEM material design, development, and demonstration during this LDRD. A fundamental understanding involving the role of the structure of the PEM material as a function of sulfonic acid content, polymer topology, chemical composition, molecular weight, and electrode electrolyte ink development was demonstrated during this LDRD. PEM materials based upon random and block polyimides, polybenzimidazoles, and polyphenylenes were created and evaluated for improvements in proton conductivity, reduced swelling, reduced O{sub 2} and H{sub 2} permeability, and increased …
Date:
December 1, 2005
Creator:
Fujimoto, Cy H.; Grest, Gary Stephen; Hickner, Michael A.; Cornelius, Christopher James; Staiger, Chad Lynn & Hibbs, Michael R.
Object Type:
Report
System:
The UNT Digital Library
ADVANCED RECIPROCATING COMPRESSION TECHNOLOGY (ARCT)
The U.S. natural gas pipeline industry is facing the twin challenges of increased flexibility and capacity expansion. To meet these challenges, the industry requires improved choices in gas compression to address new construction and enhancement of the currently installed infrastructure. The current fleet of installed reciprocating compression is primarily slow-speed integral machines. Most new reciprocating compression is and will be large, high-speed separable units. The major challenges with the fleet of slow-speed integral machines are: limited flexibility and a large range in performance. In an attempt to increase flexibility, many operators are choosing to single-act cylinders, which are causing reduced reliability and integrity. While the best performing units in the fleet exhibit thermal efficiencies between 90% and 92%, the low performers are running down to 50% with the mean at about 80%. The major cause for this large disparity is due to installation losses in the pulsation control system. In the better performers, the losses are about evenly split between installation losses and valve losses. The major challenges for high-speed machines are: cylinder nozzle pulsations, mechanical vibrations due to cylinder stretch, short valve life, and low thermal performance. To shift nozzle pulsation to higher orders, nozzles are shortened, and to …
Date:
December 1, 2005
Creator:
Deffenbaugh, Danny M.; Brun, Klaus; Harris, Ralph E.; Harrell, J. Pete; Mckee, Robert J.; Moore, J. Jeffrey et al.
Object Type:
Report
System:
The UNT Digital Library
[Aerial view of Cross Plains]
Aerial photograph of Cross Plains after firestorm.
Date:
December 2005
Creator:
unknown
Object Type:
Photograph
System:
The Portal to Texas History
Aeronautics Star, The Year in Review: 2005
Special issue of a newsletter published for employees of Lockheed Martin Aeronautics Co.; this "year in review" publication highlights accomplishments of the organization and employees who received awards, as well as articles about various programs and activities during the year.
Date:
December 2005
Creator:
Lockheed Martin Astronautics Corporation
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
Aesthetic Models and Structural Features in Concerto for Solo Percussion and Concert Band
Concerto for Solo Percussion and Concert Band was commissioned by Staff Sergeant Rone Sparrow, a percussionist with the West Point Military Academy Band. Funding for the project was provided by the Barlow Foundation. The piece was premiered April 13, 2005 in the Eisenhower Hall Theater at West Point, New York. Rone Sparrow performed with the USMA band, and Colonel Thomas Rotondi Jr., Commander/Conductor, conducted the piece. The concerto consists of three movements, and each movement features a different instrument: the first features marimba, the second, vibraphone, and the third movement features the drum kit together with a rhythm section (piano, bass, and drums). In addition to the piece, the dissertation paper discusses important technical detail related to the piece, including: harmony, form, rhythm, programmatic ideas as they relate to motivic strands, and the process of generating and discarding material. The paper also focuses on a number of factors that were influential to the piece, such as postmodern philosophy.
Date:
December 2005
Creator:
Anderson, Stephen Reg
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Air Contaminant Emission Inventory Reporting Requirements
This chapter applies to all air contaminant sources and to their owners and operators.
Date:
December 2005
Creator:
Department of Natural Resources
Object Type:
Text
System:
The UNT Digital Library
The Albany News (Albany, Tex.), Vol. 130, No. 27, Ed. 1 Thursday, December 1, 2005
Weekly newspaper from Albany, Texas that includes local, county, and state news along with extensive advertising.
Date:
December 1, 2005
Creator:
Lucas, Melinda L.
Object Type:
Newspaper
System:
The Portal to Texas History
[Alpha Phi members volunteer as Santa's Helpers]
Photograph of three members of UNT's Alpha Phi sorority volunteering with the WFAA Santa's Helpers program. Three young women can be seen standing side by side, looking at the camera and smiling. They are each wearing a red bow tie over an Alpha Phi-branded sweatshirt. The girl on the left is holding a basket in her right hand.
Date:
2005-12~
Creator:
University of North Texas. Office of Greek Affairs.
Object Type:
Photograph
System:
The UNT Digital Library
Altus Times (Altus, Okla.), Vol. 107, No. 204, Ed. 1 Thursday, December 1, 2005
Daily newspaper from Altus, Oklahoma that includes local, state, and national news along with advertising.
Date:
December 1, 2005
Creator:
Bush, Michael
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Ambrosia Beetle (Coleoptera: Scolytidae) Species, Flight, and Attack on Living Eastern Cottonwood Trees.
ABSTRACT In spring 2002, ambrosia beetles (Coleoptera: Scolytidae) infested an intensively managed 22-ha tree plantation on the upper coastal plain of South Carolina. Nearly 3,500 scolytids representing 28 species were captured in ethanol-baited traps from 18 June 2002 to 18 April 2004. More than 88% of total captures were exotic species. Five species [Dryoxylon onoharaensum (Murayama), Euwallacea validus (Eichhoff), Pseudopityophthorus minutissimus (Zimmermann), Xyleborus atratus Eichhoff, and Xyleborus impressus Eichhoff]) were collected in South Carolina for the ÃÂÃÂrst time. Of four tree species in the plantation, eastern cottonwood, Populus deltoides Bartram, was the only one attacked, with nearly 40% of the trees sustaining ambrosia beetle damage. Clone ST66 sustained more damage than clone S7C15. ST66 trees receiving fertilization were attacked more frequently than trees receiving irrigation, irrigation_fertilization, or controls, although the number of S7C15 trees attacked did not differ among treatments. The study location is near major shipping ports; our results demonstrate the necessity for intensive monitoring programs to determine the arrival, spread, ecology, and impact of exotic scolytids.
Date:
December 1, 2005
Creator:
Coyle, D.R. & Wallace, D.C. Booth: M.S.
Object Type:
Article
System:
The UNT Digital Library
Analysis of operations and cyber security policies for a system of cooperating Flexible Alternating Current Transmission System (FACTS) devices.
Flexible Alternating Current Transmission Systems (FACTS) devices are installed on electric power transmission lines to stabilize and regulate power flow. Power lines protected by FACTS devices can increase power flow and better respond to contingencies. The University of Missouri Rolla (UMR) is currently working on a multi-year project to examine the potential use of multiple FACTS devices distributed over a large power system region in a cooperative arrangement in which the FACTS devices work together to optimize and stabilize the regional power system. The report describes operational and security challenges that need to be addressed to employ FACTS devices in this way and recommends references, processes, technologies, and policies to address these challenges.
Date:
December 1, 2005
Creator:
Phillips, Laurence R.; Tejani, Bankim; Margulies, Jonathan; Hills, Jason L.; Richardson, Bryan T.; Baca, Micheal J. et al.
Object Type:
Report
System:
The UNT Digital Library
Analysis of the One-Horned Rhinoceros (Rhinoceros Unicornis) Habitat in the Royal Chitwan National Park, Nepal.
This study analyzes the remaining suitable habitat of the one-horned rhinoceros, Rhinoceros unicornis, in Royal Chitwan National Park of Nepal. An April 2003 Landsat image was classified into eight land cover types: wetland, sand, water, mixed forest, sal forest, agriculture, settlement, and grassland. This image was converted into habitat suitability maps using cover, food, and water. The rhinoceros prefers grassland habitat with oxbow lakes and closed canopy during the monsoon season. Nominal values of five parameters were used to create a map of habitat suitability index. The map was categorized into four habitat classes: highly unsuitable, unsuitable, moderately suitable habitat, and suitable. Landscape metrics, patch metrics and class metrics associated with habitat were determined through the use of FRAGSTATS.
Date:
December 2005
Creator:
Thapa, Vivek
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
An Analysis of the Perception of the Degree of Compliance of Selected Texas Public High Schools with Title IX of the Education Amendments of 1972
In recent years, few laws have had greater impact on public education than Title IX of the Education Amendments of 1972. As a result of this legislation, participation levels of female athletes have risen dramatically. Conducted in the Texas Education Agency's Region XI, this study sought to ascertain the perceptions of high school principals, the lead coaches of male athletes, and the lead coaches of female athletes with regard to their schools' compliance with the components of Title IX. The study centered on the results of a survey instrument that included twenty Likert-scale questions as well as several demographic questions. The research questions sought to determine: (1) respondents' overall perception of compliance; (2) any differences in perceptions of compliance based upon the role of the individual; (3) any differences in perceptions based upon the percentage of students qualifying for free and reduced lunch; (4) any differences based upon the state classification of the schools; (5) any differences based upon the gender of respondents; (6) whether complaints filed via OCR result in a perception of increased compliance; and (7) the program component areas in which respondents view their schools to be most compliant. Descriptive and causal-comparative methods were used to analyze …
Date:
December 2005
Creator:
Hollingsworth, Jerry Don
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Analysis of Transverse Resistive Instability in the Recycler
Transverse resistive wall instability is analyzed for antiprotons in the Recycler Ring. Damper requirements are formulated.
Date:
December 1, 2005
Creator:
Burov, Alexey V.
Object Type:
Report
System:
The UNT Digital Library
An Annotated Bibliography of Selected Repertoire for Alto Saxophone and Piano for Developing College-Level Alto Saxophonists, with an Analysis of Yvon Bourrel's Sonate Pour Alto Saxophone Et Piano
In this study the author addresses the problem of finding quality repertoire for young college-level saxophonists. By examining graded repertoire lists from a variety of college and university saxophone instructors, the author has compiled a list of 180 works for alto saxophone and piano. Twenty-four well-known works of a difficulty-level appropriate for freshman and sophomore players are identified and annotated. Each annotation consists of bibliographical information, a biographical sketch of the composer, a difficulty rating of eight elements of performance, a discussion of performance considerations, and a bibliography of available recordings. The eight elements of performance included in the difficulty rating are: Meter, key signatures, tempo, note-values, rhythm, articulation, range, and dynamic levels. Each of these facets is graded using a six-point difficulty scale. One work from the select list, Yvon Bourrel's Sonate Pour Saxophone Alto et Piano, has been analyzed in greater detail with regard to thematic material and key areas to provide in-depth information that, hopefully, will help the student gain a deeper understanding of that work and as a result perform the piece with greater artistry.
Date:
December 2005
Creator:
Kallestad, Scott D.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library