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in subjects: "Affinity"

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Electronegative gases

Recent knowledge on electronegative gases essential for the effective control of the number densities of free electrons in electrically stressed gases is highlighted. This knowledge aided the discovery of new gas dielectrics and the tailoring of gas dielectric mixtures. The role of electron attachment in the choice of unitary gas dielectrics or electronegative components in dielectric gas mixtures, and the role of electron scattering at low energies in the choice of buffer gases for such mixtur… more

Date: January 1, 1981

Creator: Christophorou, L.G.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Exceptional Electron Transport Properties of In-rich InGaN

Recent years have seen an explosion of interest in the narrow band gap end of the InGaN alloy system, particularly in InN. The existence of surface electron accumulation and a tendency for n-type conductivity have been well-established and are explained by an extremely large electron affinity and the location of the Fermi level stabilization energy (E{sub FS}) high in the conduction band [1]. These characteristics pose significant challenges to the integration of In-rich InGaN into devices and … more

Date: October 22, 2006

Creator: Jones, R. E.; van Genuchten, H. C. M.; Yu, K. M.; Walukiewicz, W.; Li, S. X.; Liliental-Weber, Z. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Radiolytically-induced novel materials and their application to waste processing

In the present NEER project we investigated two different types of gel materials with respect to potential applications in environmental remediation, including mixed waste generated from the nuclear fuel cycles. The materials under study were: (1) silica-polymer based aerogel composites into which specific metallic cations diffuse into and remain, and (2) polymer gels made of thermo-sensitive polymer networks, whose functional groups can be ''tailored'' to have a preferred affinity for specific… more

Date: December 5, 2007

Creator: Massimo Bertino, Akira Tokuhiro, Tadashi Tokuhiro

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Mixed-Matric Membranes for CO2 and H2 Gas Separations Using Metal-Organic Framework and Mesoporus Hybrid Silicas

In this work, we have investigated the separation performance of polymer-based mixed-matrix membranes containing metal-organic frameworks and mesoporous hybrid silicas. The MOF/Matrimid{reg_sign} and MOP-18/Matrimid{reg_sign} membranes exhibited improved dispersion and mechanical strength that allowed high additive loadings with reduced aggregation, as is the case of the 80 wt% MOP-18/Matrimid{reg_sign} and the 80% (w/w) Cu-MOF/Matrimid{reg_sign} membranes. Membranes with up to 60% (w/w) ZIF-8 … more

Date: January 7, 2009

Creator: Musselman, Inga; Kenneth Balkus, Jr. & Ferraris, John

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Engineering MerR for Sequestration and MerA for Reduction of Toxic Metals and Radionuclides

The objectives of this project were (1) to alter a metalloregulatory protein (MerR) so that it would bind other toxic metals or radionuclides with similar affinity so that the engineered protein itself and/or bacteria expressing it could be deployed in the environment to specifically sequester such metals and (2) to alter the mercuric reductase, MerA, to reduce radionuclides and render them less mobile. Both projects had a basic science component. In the first case, such information about MerR … more

Date: December 15, 2008

Creator: Summers, Anne O.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Colloid facilitated transport in fractured rock : parameter estimation and comparison with experimental data

Many contaminants in groundwater strongly interact with the immobile porous matrix, which retards their movement relative to groundwater flow. Colloidal particles, which are often present in groundwater, have a relatively small size and large specific surface area which makes it possible for them to also adsorb pollutants. The sorption of tracers to colloids may enhance their mobility in groundwater, relative to the case where colloids are not present. A class of pollutants for which colloid-fa… more

Date: January 1, 2002

Creator: Viswanathan, H. S. (Hari Selvi) & Wolfsberg, A. V. (Andrew V.)

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Active assembly for large-scale manufacturing of integrated nanostructures.

Microtubules and motor proteins are protein-based biological agents that work cooperatively to facilitate the organization and transport of nanomaterials within living organisms. This report describes the application of these biological agents as tools in a novel, interdisciplinary scheme for assembling integrated nanostructures. Specifically, selective chemistries were used to direct the favorable adsorption of active motor proteins onto lithographically-defined gold electrodes. Taking advanta… more

Date: January 1, 2007

Creator: Spoerke, Erik David; Bunker, Bruce Conrad; Orendorff, Christopher J.; Bachand, George David; Hendricks, Judy K. & Matzke, Carolyn M.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Characterization of Open-Cycle, Coal-Fired MHD Generators. Ninth-Tenth Quarterly Technical Progress Report, July 1, 1978-April 30, 1979

The successful design of full-scale open-cycle, coal-fired MHD generators for baseload electrical production requires a detailed understanding of the plasma chemical and plasma dynamic characteristics of anticipated combustor and channel fluids. This report documents progress in efforts to model negative ion formation and slag condensation effects on core flow conductivity, to improve the ability to sample and characterize laboratory produced coal combustion plasmas, and to measure mechanisms a… more

Date: May 1, 1979

Creator: Kolb, C. E.; Wormhoudt, J.; Yousefian, V.; Cheng, W.; Bien, F.; Martinez-Sanchez, M. et al.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Atomic negative ions

We review some of the recent progress in the studies of alkaline-earth, negative ions. Computations of autodetachment rates, electron affinities and transition wavelengths are discussed and some new and improved results are given.

Date: January 1, 1991

Creator: Brage, T.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Correlation in photodetachment

Electron correlation plays a major role in all aspects of the photodetachment of an electron from a negative ion. Photodetachment measurements are well suited to investigate the relatively short range forces associated with correlation due to the absence of the long range Coulomb interaction. Measurements of electron affinities, asymmetry parameters and cross sections are described to illustrate the influence of correlation on photodetachment. 25 refs., 4 figs.

Date: January 1, 1991

Creator: Pegg, D. J.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Androgen receptor-based imaging agents for the prostate: Synthesis and tissue distribution studies with tritium and fluorine-18 labeled androgens

No Description Available.

Date: January 1, 1990

Creator: Liu, A.; Carlson, K.E.; Katzenellenbogen, J.A. (Illinois Univ., Urbana, IL (United States). Dept. of Chemistry); VanBrocklin, H.F.; Mathias, C.J. & Welch, M.J. (Washington Univ., St. Louis, MO (United States). Edward Mallinckrodt Inst. of Radiology)

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Toxin studies using an integrated biophysical and structural biology approach.

Clostridial neurotoxins, such as botulinum and tetanus, are generally thought to invade neural cells through a process of high affinity binding mediated by gangliosides, internalization via endosome formation, and subsequent membrane penetration of the catalytic domain activated by a pH drop in the endosome. This surface recognition and internalization process is still not well understood with regard to what specific membrane features the toxins target, the intermolecular interactions between b… more

Date: March 1, 2005

Creator: Last, Julie A.; Schroeder, Anne E.; Slade, Andrea Lynn; Sasaki, Darryl Yoshio; Yip, Christopher M. (University of Toronto, Toronto, Ontario, Canada) & Schoeniger, Joseph S. (Sandia National Laboratories, Livermore, CA)

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Analysis of Protein-RNA and Protein-Peptide Interactions in Equine Infectious Anemia

Macromolecular interactions are essential for virtually all cellular functions including signal transduction processes, metabolic processes, regulation of gene expression and immune responses. This dissertation focuses on the characterization of two important macromolecular interactions involved in the relationship between Equine Infectious Anemia Virus (EIAV) and its host cell in horse: (1) the interaction between the EIAV Rev protein and its binding site, the Rev-responsive element (RRE) and … more

Date: December 1, 2007

Creator: Lee, Jae-Hyung

Item Type: Thesis or Dissertation

Partner: UNT Libraries Government Documents Department

open access

Development of Superior Sorbents for Separation of CO2 from Flue Gas at a Wide Temperature Range During Coal Combustion

In chapter 1, the studies focused on the development of novel sorbents for reducing the carbon dioxide emissions at high temperatures. Our studies focused on cesium doped CaO sorbents with respect to other major flue gas compounds in a wide temperature range. The thermo-gravimetric analysis of sorbents with loadings of CaO doped on 20 wt% cesium demonstrated high CO{sub 2} sorption uptakes (up to 66 wt% CO{sub 2}/sorbent). It is remarkable to note that zero adsorption affinity for N{sub 2}, O{s… more

Date: June 30, 2007

Creator: Smirniotis, Panagiotis G.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Final report : LDRD project 79824 carbon nanotube sorting via DNA-directed self-assembly.

Single-wall carbon nanotubes (SWNTs) have shown great promise in novel applications in molecular electronics, biohazard detection, and composite materials. Commercially synthesized nanotubes exhibit a wide dispersion of geometries and conductivities, and tend to aggregate. Hence the key to using these materials is the ability to solubilize and sort carbon nanotubes according to their geometric/electronic properties. One of the most effective dispersants is single-stranded DNA (ssDNA), but there… more

Date: October 1, 2007

Creator: Robinson, David B; Leung, Kevin; Rempe, Susan B.; Dossa, Paul D.; Frischknecht, Amalie Lucile & Martin, Marcus Gary

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

CO2-selective, Hybrid Membranes by Silation of Alumina

Hybrid membranes are feasible candidates for the separation of CO2 from gas produced in coal-based power generation since they have the potential to combine the high selectivity of polymer membranes and the high permeability of inorganic membranes. An interesting method for producing hybrid membranes is the silation of an inorganic membrane. In this method, trichloro- or alkoxy-silanes interact with hydroxyl groups on the surface of γ-AlO3 or TiO2, binding organic groups to that surface. By var… more

Date: September 1, 2007

Creator: Luebke, D. R. & Pennline, H. W.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Development of Superior Sorbents for Separation of CO2 from Flue Gas at a Wide Temperature range during Coal Combustion

A number basic sorbents based on CaO were synthesized, characterized with novel techniques and tested for sorption of CO{sub 2} and selected gas mixtures simulating flue gas from coal fired boilers. Our studies resulted in highly promising sorbents which demonstrated zero affinity for N{sub 2}, O{sub 2}, SO{sub 2}, and NO very low affinity for water, ultrahigh CO{sub 2} sorption capacities, and rapid sorption characteristics, CO{sub 2} sorption at a very wide temperature range, durability, and … more

Date: September 17, 2002

Creator: Smirniotis, Panagiotis

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Application of NMR Methods to Identify Detection Reagents for Use in the Development of Robust Nanosensors

Nuclear Magnetic Resonance (NMR) spectroscopy is a powerful technique for studying bi-molecular interactions at the atomic scale. Our NMR lab is involved in the identification of small molecules, or ligands that bind to target protein receptors, such as tetanus (TeNT) and botulinum (BoNT) neurotoxins, anthrax proteins and HLA-DR10 receptors on non-Hodgkin's lymphoma cancer cells. Once low affinity binders are identified, they can be linked together to produce multidentate synthetic high affinit… more

Date: April 29, 2004

Creator: Cosman, M; Krishnan, V V & Balhorn, R

Item Type: Book

Partner: UNT Libraries Government Documents Department

open access

Uranium and Aluminosilicate Surface Precipitation Tests

The 2H evaporator at the Savannah River Site has been used to treat an aluminum-rich waste stream from canyon operations and a silicon-rich waste stream from the Defense Waste Processing Facility. The formation of aluminosilicate scale in the evaporator has caused significant operational problems. Because uranium has been found to accumulate in the aluminosilicate solids, the scale deposition has introduced criticality concerns as well. The objective of the tests described in this report is to … more

Date: November 27, 2002

Creator: Hu, M.Z.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Development of novel epidermal growth receptor-basedradiopharmaceuticals: Imaging agents for breast cancer

The goal of this research was to develop epidermal growthfactor receptor (EGFR) nuclear medicine breast cancer imaging agents. Ourapproach was to synthesize small molecule inhibitors of the EGFR tyrosinekinase (tk) suitable for labeling with single photon or positron-emittingradioisotopes and evaluate the imaging potential of these new molecules.We have synthesized and fully characterized 22 quinazoline compounds. Allcompounds inhibit EGFR tk phosphorylation activity in the nanomolarrange. All … more

Date: September 25, 2001

Creator: Van Brocklin, Henry F.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Integration of biological ion channels onto optically addressable micro-fluidic electrode arrays for single molecule characterization.

The challenge of modeling the organization and function of biological membranes on a solid support has received considerable attention in recent years, primarily driven by potential applications in biosensor design. Affinity-based biosensors show great promise for extremely sensitive detection of BW agents and toxins. Receptor molecules have been successfully incorporated into phospholipid bilayers supported on sensing platforms. However, a collective body of data detailing a mechanistic unders… more

Date: December 1, 2004

Creator: Brozik, Susan Marie; Frink, Laura J. Douglas; Bachand, George David; Keller, David J. (University of New Mexico, Albuquerque, NM); Patrick, Elizabeth L.; Marshall, Jason A. (University of New Mexico, Albuquerque, NM) et al.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Diamond Amplified Photocathodes

High-average-current linear electron accelerators require photoinjectors capable of delivering tens to hundreds of mA average current, with peak currents of hundreds of amps. Standard photocathodes face significant challenges in meeting these requirements, and often have short operational lifetimes in an accelerator environment. We report on recent progress toward development of secondary emission amplifiers for photocathodes, which are intended to increase the achievable average current while … more

Date: November 26, 2007

Creator: Smedley, J.; Ben-Zvi, Ilan; Bohon, J.; Chang, X.; Grover, R.; Isakovic, A. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

(Radiolabeled androgens and progestins as imaging agents for tumors of the prostate and breast)

The specific aims of the previous grant application can be summarized as follows: Synthesize fluorine-substituted progestins from the following high affinity classes: R5020 (promegestone), norgestrel, RU486, and retroprogestins; Synthesize fluorine-substituted androgens from the following high affinity classes: mibolerone, R1881 (metribolone) and 2-oxometribolone; Evaluate the receptor binding and non-specific binding of these fluorosteroids by in vitro binding assays; Develop and optimize fluo… more

Date: January 1, 1991

Creator: Katzenellenbogen, J.A.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

A theoretical analysis of the extraction of heterocyclic organic compounds from an organic phase using chemically mediated electrochemically modulated complexation in ion exchange polymer beads

A cyclical electrochemical process for the removal of heterocyclic organic compounds (pollutants) from an organic solvent using an ion-exchange polymer is analyzed. In this analysis, there are three main steps: In the first step, the polymer beads containing the active form of the complexing agent are contacted with the contaminated (feed) hydrocarbon phase. The pollutant diffuses into the beads and binds with the complexing agent which is in the reduced state. It is a fast reversible reaction.… more

Date: January 1, 1991

Creator: Ozekin, K.; Noble, R.D. & Koval, C.A.

Item Type: Report

Partner: UNT Libraries Government Documents Department