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The 2.3 {angstrom} crystal structure of cholera toxin B subunit pentamer: Choleragenoid
Cholera toxin, a heterohexameric AB{sub 5} enterotoxin released by Vibrio cholera, induces a profuse secretory diarrhea in susceptible hosts. Choleragenoid, the B subunit pentamer of cholera toxin, directs the enzymatic A subunit to its target by binding to GM{sub 1} gangliosides exposed on the luminal surface of intestinal epithelial cells. We have solved the crystal structure of choleragenoid at 2.3 {Angstrom} resolution by combining single isomorphous replacement with non-crystallographic symmetry averaging. The structure of the B subunits, and their pentameric arrangement, closely resembles that reported for the intact holotoxin (choleragen), the heat-labile enterotoxin from E. coli, and for a choleragenoid-GM{sub 1} pentasaccharide complex. In the absence of the A subunit the central cavity of the B pentamer is a highly solvated channel. The binding of the A subunit or the receptor pentasaccharide to choleragenoid has only a modest effect on the local stereochemistry and does not perceptibly alter the subunit interface.
Date:
February 1, 1996
Creator:
Zhang, Rong-Guang; Westbrook, M. L.; Maulik, P. R.; Reed, R. A.; Shipley, G.; Westbrook, E. M. et al.
Object Type:
Report
System:
The UNT Digital Library
125 TON MPC WASTE PACKAGE SHIELDING ANALYSIS/2-D DORT (SCPB: N/A)
This analysis is prepared by the Mined Geologic Disposal System (MGDS) Waste Package Development Department (WPDD) to determine the dose rates from the MPC waste packages to be used by the EBS and other repository systems to incorporate ALARA practices in the overall repository design in compliance with the goals of the Waste Package Implementation Plan for conceptual design. These design calculations are performed in sufficient detail to provide a comprehensive comparison base with other design alternatives. The objectives of this evaluation are (1) to show the dose rate as a function of distance from the waste package surface and (2) to provide the shielding thicknesses required for the waste package transporter to meet a 10 mrem/hr target dose rate at 2 meters from the transporter surface.
Date:
February 26, 1996
Creator:
Skulina, D. J.
Object Type:
Report
System:
The UNT Digital Library
225-B ion exchange piping design documentation
This document describes the interface between the planned permanent ion exchange piping system and the planned portable ion exchange system. This is part of the Waste Encapsulation and Storage Facility (WESF). In order to decouple this WESF from B-Plant and to improve recovery from a capsule leak, contaminated pool cell water will be recirculated through a portable ion exchange resin system.
Date:
February 1, 1996
Creator:
Prather, M. C.
Object Type:
Report
System:
The UNT Digital Library
242-A campaign 95-1 post run document
The 242-A Evaporator Campaign 95-1 was started on June 6, 1995 and finished July 27, 1995. An overall Waste Volume Reduction (WVR) of 8.18 million liters (2.16 mGAL OR 87.6% WVRF) was achieved from 9.35 million liters (2.47 Mgal) of processable waste contained in 108-AP, 107-AP, 106-AW and 102-AW. Slurry generated from Campaign 95-1 consisted of 1.05 million liters (278,000 gal) of dilute double-shell slurry feed (DDSSF) with a SpG of approximately 1.34. Total process condensate discharged to LERF was 10.3 million liters (2.72 Mgal), achieving a condensate/WVR efficiency ratio of 1.26. Total throughout for Campaign 95-1 was 18.1 million liters (4.79 Mgal). B Pond discharges from steam condensate and cooling water were 15.8 and 583 million liters (4.17 and 154 Mgal) respectively. Based on 145 hours of unplanned downtime, the 242-A Evaporator maintained an operating efficiency of 86% during the 49 day campaign.
Date:
February 12, 1996
Creator:
Guthrie, M.D.
Object Type:
Report
System:
The UNT Digital Library
309 Facility deactivation and decommisioning Criteria Completion Check Lists
To facilitate and track completion of the 309 Facility turnover criteria completion an Applicability Matrix and Criteria Completion Check Lists were prepared. The applicability matrix documents the required turnover criteria for a given area in the facility or scope of work. The applicable criteria is selected for 16 different areas. For each area a completion checklist is provided to document completion of a requirement by WHC and the Environmental Restoration Contractor.
Date:
February 1, 1996
Creator:
Cornwell, B.C.
Object Type:
Report
System:
The UNT Digital Library
15th Street News (Midwest City, Okla.), Vol. 25, No. 17, Ed. 1 Friday, February 2, 1996
Newspaper from Rose State College in Midwest City, Oklahoma that includes national, local, and campus news along with advertising.
Date:
February 2, 1996
Creator:
Stimmel, Eldridge
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
15th Street News (Midwest City, Okla.), Vol. 25, No. 18, Ed. 1 Friday, February 9, 1996
Newspaper from Rose State College in Midwest City, Oklahoma that includes national, local, and campus news along with advertising.
Date:
February 9, 1996
Creator:
Stimmel, Eldridge
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
15th Street News (Midwest City, Okla.), Vol. 25, No. 19, Ed. 1 Friday, February 16, 1996
Newspaper from Rose State College in Midwest City, Oklahoma that includes national, local, and campus news along with advertising.
Date:
February 16, 1996
Creator:
Stimmel, Eldridge
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
15th Street News (Midwest City, Okla.), Vol. 25, No. 20, Ed. 1 Friday, February 23, 1996
Newspaper from Rose State College in Midwest City, Oklahoma that includes national, local, and campus news along with advertising.
Date:
February 23, 1996
Creator:
Stimmel, Eldridge
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
[1995 annual report on activity performed for the Advanced Utility Concepts Division]. Annual progress report, October 1, 1994--September 30, 1995
This report summarizes research concerned with energy storage systems and hydrogen.
Date:
February 1, 1996
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
1995 building energy codes and standards workshops: Summary and documentation
During the spring of 1995, Pacific Northwest National Laboratory (PNNL) conducted four two-day Regional Building Energy Codes and Standards workshops across the US. Workshops were held in Chicago, Denver, Rhode Island, and Atlanta. The workshops were designed to benefit state-level officials including staff of building code commissions, energy offices, public utility commissions, and others involved with adopting/updating, implementing, and enforcing building energy codes in their states. The workshops provided an opportunity for state and other officials to learn more about residential and commercial building energy codes and standards, the role of the US Department of Energy and the Building Standards and Guidelines Program at Pacific Northwest National Laboratory, Home Energy Rating Systems (HERS), Energy Efficient Mortgages (EEM), training issues, and other topics related to the development, adoption, implementation, and enforcement of building energy codes. Participants heard success stories, got tips on enforcement training, and received technical support materials. In addition to receiving information on the above topics, workshop participants had an opportunity to provide input on code adoption issues, building industry training issues, building design issues, and exemplary programs across the US. This paper documents the workshop planning, findings, and follow-up processes.
Date:
February 1, 1996
Creator:
Sandahl, L. J. & Shankle, D. L.
Object Type:
Report
System:
The UNT Digital Library
1995 project of the year Hanford Environmental compliance project nomination
The completion of the Hanford Environmental Compliance (HEC) Project in December 1995 brought to a successful close a long line of major contributions to environmental cleanup. Not since the early days of the Hanford Site during and shortly after World War 11 had such a large group of diverse construction activities, with a common goal, been performed at Hanford. Key to this success was the unique combination of 14 subprojects under the HEC Project which afforded the flexibility to address evolving subproject requirements. This strategy resulted in the accomplishment of the HEC Project stakeholders` objectives on an aggressive schedule, at a $33 million cost savings to the customer. The primary objectives of the HEC Project were to upgrade selected Hanford Site facilities and systems to bring them into compliance with current environmental standards and regulations. The HEC Project contributed significantly towards the Hanford site compliance with Clean Water Act, Resource Conservation and Recovery Act (RCRA) and Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA) requirements. It provided, in part, those construction activities required to comply with those requirements in the areas of liquid and solid waste treatment and disposal, waste characterization, and groundwater monitoring.
Date:
February 1, 1996
Creator:
Kelly, J.R.
Object Type:
Article
System:
The UNT Digital Library
Ab initio calculation of electron excitation energies in solids
Progress in the first-principles calculation of electron excitation energies in solids is discussed. Quasiparticle energies are computed by expanding the electron self energy to first order in the screened Coulomb interaction in the so-called GW approximation. The method was applied to explain and predict spectroscopic properties of a variety of systems. Several illustrative applications to semiconductors, materials under pressure, chemisorption, and point defects in solids are presented. A recent reformulation of the method employing mixed- space functions and imaginary time techniques is also discussed.
Date:
February 1, 1996
Creator:
Louie, S. G.
Object Type:
Article
System:
The UNT Digital Library
Abilene Philharmonic Playbill: February 24, 1996
Program for an Abilene Philharmonic concert that ran from February 24th to March 9th (classical IV and Pop III) during the 46th season. It includes information about the pieces performed, artists and musicians, and advertising from local companies.
Date:
February 1996
Creator:
Abilene Philharmonic
Object Type:
Pamphlet
System:
The Portal to Texas History
ABS plastic RPCs
After investigating a number of materials, we discovered that an ABS plastic doped with a conducting polymer performs well as the resistive electrode in a narrow gap RPC (resistive plate chamber). Operating in the streamer mode, we find efficiencies of 90-96% with low noise and low strip multiplicities. We have also studied a variety of operating gases and found that a mixture containing SF{sub 6}, a non-ozone depleting gas, argon and isobutane gives good streamer mode performance, even with isobutane concentrations of 20% or less.
Date:
February 1, 1996
Creator:
Ables, E.; Bionta, R.; Olson, H.; Ott, L.; Parker, E.; Wright, D. et al.
Object Type:
Article
System:
The UNT Digital Library
Absorption spectra and speciation of plutonium(VI) with phosphate
Plutonium(VI)-phosphate species in aqueous solution, at pH < 2.4, formed two species: PuO{sub 2}H{sub 2}PO{sub 4}{sup +} (characterized by an 835 nm absorption band) and the solid phase PuO{sub 2}(H{sub 2}PO{sub 4}){sub 2}. The stability constant {beta} for the PuO{sub 2}H{sub 2}PO{sub 4}{sup +} species was determined to be log {beta} = 2.1 {+-} 0.1 (ionic strength = 0.6--0.9 M) and log {beta}{sup T} = 2.6 {+-} 0.15 (zero ionic strength). Four Pu(VI)-phosphate species (absorption bands at 842, 846, 857, and 866 nm) formed at pH = 2.4 to 12.2 and are characterized by polynuclear behavior, the formation of precipitates, and colloidal properties. The 842 and 846 nm species are believed to be [PuO{sub 2}(HPO{sub 4}){sub m}]{sub n} and [PuO{sub 2}(NaPO{sub 4}){sub m}]{sub n}. The 857 and 866 nm species area as yet unidentified. The speciation of plutonium with phosphate is of interest to radionuclide migration studies because phosphate is present in many groundwaters and may be used as an actinide getter in nuclear waste disposal. An actinide getter is a complexing agent that forms insoluble phases with actinides, thereby reducing their migration.
Date:
February 1, 1996
Creator:
Weger, H. T. & Reed, D.
Object Type:
Report
System:
The UNT Digital Library
Abundance and Distribution of Sea Turtles off North Carolina
Report on a study of migration patterns and density of loggerhead, leatherback, and Kemp's ridley sea turtles in order to determine the potential impact of Mobil Oil's plan to drill an exploratory well 45 miles east-northeast of Cape Hatteras, NC.
Date:
February 1996
Creator:
Keinath, J. A.; Musick, J. A. & Barnard, D. E.
Object Type:
Report
System:
The UNT Digital Library
Accelerator Production of Tritium Programmatic Environmental Impact Statement Input Submittal
The Programmatic Environmental Impact Statement for Tritium Supply and Recycling considers several methods for the production of tritium. One of these methods is the Accelerator Production of Tritium. This report summarizes the design characteristics of APT including the accelerator, target/blanket, tritium extraction facility, and the balance of plant. Two spallation targets are considered: (1) a tungsten neutron-source target and (2) a lead neutron-source target. In the tungsten target concept, the neutrons are captured by the circulating He-3, thus producing tritium; in the lead target concept, the tritium is produced by neutron capture by Li-6 in a surrounding lithium-aluminum blanket. This report also provides information to support the PEIS including construction and operational resource needs, waste generation, and potential routine and accidental releases of radioactive material. The focus of the report is on the impacts of a facility that will produce 3/8th of the baseline goal of tritium. However, some information is provided on the impacts of APT facilities that would produce smaller quantities.
Date:
February 1, 1996
Creator:
Miller, L. A.; Greene, G. A. & Boyack, B. E.
Object Type:
Report
System:
The UNT Digital Library
[Acceptance Letter to Marcus Fellowship Program]
A letter from Beth Reese to the Marcus Fellowship Program, expressing sincere appreciation and formally accepting the offered fellowship opportunity. Beth shares her enthusiasm and gratitude for being selected, setting the tone for a collaborative and enriching experience within the program.
Date:
February 20, 1996
Creator:
unknown
Object Type:
Letter
System:
The UNT Digital Library
Acceptance Test Procedure (ATP) for the SNF canisters sludge depth measurement device
This document outlines the steps required to properly document the acceptance testing of this prototypical device.
Date:
February 2, 1996
Creator:
Steele, R.J.
Object Type:
Report
System:
The UNT Digital Library
Acceptance test report, 241-AW air inlet filter station pressure decay test
This is the acceptance test report for pressure decay tests performed on newly-installed 241-AW Tank Farm primary ventilation system air inlet filter stations.
Date:
February 21, 1996
Creator:
Tuck, J.A.
Object Type:
Report
System:
The UNT Digital Library
Address to Texas Human Rights Foundation Awards Event by Don Baker
Copy of speech written by Don Baker for the Texas Human Rights Foundation awards event.
Date:
February 24, 1996
Creator:
unknown
Object Type:
Text
System:
The UNT Digital Library
[Admission Decision Notification: Marcus Fellow Program]
A formal letter from the UNT School of Visual Arts Admissions Committee delivering the news to an applicant regarding the outcome of their Marcus Fellow Program application. The letter sensitively communicates the decision and provides guidance for future opportunities or considerations.
Date:
February 5, 1996
Creator:
unknown
Object Type:
Letter
System:
The UNT Digital Library
Adsorption of radionuclides on minerals studies illustrating the effect of solid phase selectivity and of mechanisms controlling sorption processes
Currently, extensive research is being done on the geochemistry of Yucca Mountain, Nevada. The purpose of this research is to determine whether this location would be suitable as a permanent high-level radioactive waste repository. Site characterization tests must prove that Yucca Mountains` geology will safely isolate radioactive waste from the environment for at least 10,000 years before approval is granted. In order for this to occur, it is necessary to study the sorptive properties of the host rock, and its selectivity in sorption of solutions containing multiple radionuclides. Validation of this must occur, because in the case of a catastrophic leak, the host rock must have properties that will retard the migration of radionuclides. Columnar experimental techniques were employed using goethite, (a hydrous iron oxide), beidellite (clay mineral), & {open_quotes}nonscents{close_quotes} (a zeolitized volcanic tuff) as sorbents. These sorbents were used to measure the isotherms of an identical binary solution (Ni-Sr) to illustrate the selectivity that occurs in different minerals. In beidellite, the sorption process was ideal, while for {open_quotes}nonscents{close_quotes} there was a strong preference for Sr{sup 2+}. The sorption process was modeled (Ni-Sr {open_quotes}Nonscents{close_quotes}) using ion exchange theory as the mechanism. In goethite, the sorption of Ni-Sr showed a complete …
Date:
February 1, 1996
Creator:
Netus, B.
Object Type:
Report
System:
The UNT Digital Library