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Spectroscopy at Metal Cluster Surfaces. Annual Report, Year 2

Description: The focus of our research program is the study of gas phase metal clusters to evaluate their potential to model fundamental interactions present on metal surfaces. To do this, we characterize the chemical bonding present between the component atoms in metal clusters as well as the bonding exhibited by ``physisorption`` on cluster surfaces. Electronic spectra, vibrational frequencies and bond neutral and ionized clusters with a variety of laser/mass spectrometry techniques. We are particularly i… more
Date: August 1, 1995
Creator: Duncan, Michael A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Mineral Cycling in Soil and Litter Arthropod Food Chains. Progress Report, November 1, 1979-October 31, 1980

Description: Recent progress and current status are reported for research concerned with mineral element dynamics in soil arthropod food chains. Research is performed within the larger context of terrestrial decomposition systems, in which soil arthropods may act as regulators of nutrient dynamics during decomposition. Research is measuring rates of nutrient accumulation and excretion by using radioactive tracer techniques with radioactive analogs of nutrients. Experimental measurement of radioactive tracer… more
Date: August 1, 1980
Creator: Crossley, D. A., Jr.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Comparison of Soil Surface Arthropod Populations in Conventional Tillage, No-tillage and Old Field Systems

Description: Soil surface arthropod populations in conventional tillage (CT) and no-tillage (NT) sorghum and adjacent old field (OF) were compared using pitfall trap captures. Total numbers of individuals and species, overall diversity (anti H), richness (D), evenness (J'), dominance (C) and similarity quotients (QS) between systems were calculated for each of seven 24 hour sampling periods throughout the season. Although each system was distinct (any two of the systems had less than 30 percent of their spe… more
Date: August 1, 1980
Creator: Blumberg, A. Y. & Crossley, D. A., Jr.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Improved methods for measuring radioactive tracer accumulation and excretion by microarthropods, with applications for a mite species, Tyrophagus longior (Acarina, Acaridae)

Description: Radioisotope retention measurements of /sup 85/Sr and /sup 51/Cr in Tyrophagus longior (Gervais) (Acari: Acaridae) were fit to 2 and 1 component models. Biological half-life for the rapid component of both radioisotopes was about 10 hours, with assimilation of /sup 85/Sr being 62%. The identification of /sup 51/Cr turnover as gut clearance must remain tentative. An inexpensive disposable culture chamber for measuring radioisotope retention in microarthropods is described along with details of m… more
Date: August 1, 1980
Creator: Abbott, David T. & Crossley, D. A., Jr.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Comparison of Mineral Element Cycling Under Till and No-Till Practices: An Experimental Approach to Agroecosystems Analysis

Description: In this paper we give an overview of a research project which is attempting to integrate the approaches of agronomy and ecosystem ecology. We are attempting to apply methodologies and approaches of ecosystem study, in particular nutrient cycling, as a means of evaluating performance of agronomic systems. Specifically, we are comparing structure, function, and nutrient dynamics in a set of no-tillage and conventional plots.
Date: August 1, 1980
Creator: Stinner, Benjamin R. & Crossley, D. A., Jr.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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E4 Moments for Deformed Rare-Earth and Heavy Transitional Nuclei

Description: Techniques for measuring reduced matrix elements <4/sup +/ parallel M(E4) parallel 0/sup +/>, the interpretation of these data, and the implications for various nuclear models are reviewed and discussed. Actual examples are confined to deformed rare-earth and heavy transitional nuclei. 33 refs., 9 figs.
Date: August 1, 1987
Creator: Baker, F.Todd
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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High Energy Hadron-hadron Collisions. Final Report

Description: This project of studying high energy collision phenomena with the geometrical model has been undertaken and developed by this investigator and collaborators since 1967. Instead of basing conjectures on mathematical extrapolations from some ad hoc theories, this approach was to scrutinize first the general features of the phenomena before going into specific details. This particular method has proved successful in correlating experimental data, suggesting experiments, predicting new phenomena an… more
Date: August 1, 1995
Creator: Chou, T.T.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Plant cell wall architecture. Final technical report for DOE award no. DE-FG02-97ER20258

Description: The goals of the project were to investigate the roles of caffeoyl coenzyme A O-methyltransferase (CCoAOMT), an enzyme involved in the phenylpropanoid biosynthetic pathway, in the biosynthesis of lignin. The investigators proposed to analyze the expression pattern of CCoAOMT in plants, and examine how reduction in the expression of CCoAOMT would affect lignin content and composition. The goals were fulfilled, and significant findings on lignin biochemistry were made. Two papers were published, … more
Date: August 6, 2002
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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The Center for Plant and Microbial Complex Carbohydrates at the University of Georgia Complex Carbohydrate Research Center. Annual Report, September 15, 1990--December 31, 1991

Description: Research from the Complex Carbohydrates Research Center at the University of Georgia is presented. Topics include: Structural determination of soybean isoflavones which specifically induce Bradyrhizobium japonicum nodD1 but not the nodYABCSUIJ operon; structural analysis of the lipopolysaccharides (LPSs) from symbiotic mutants of Bradyrhizobium japonicum; structural characterization of lipooligosaccharides from Bradyrhizobium japonicum that are required for the specific nodulation of soybean; s… more
Date: August 1, 1991
Creator: Albersheim, Peter & Darvill, A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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The Center for Plant and Microbial Complex Carbohydrates at the University of Georgia Complex Carbohydrate Research Center

Description: Research from the Complex Carbohydrates Research Center at the University of Georgia is presented. Topics include: Structural determination of soybean isoflavones which specifically induce Bradyrhizobium japonicum nodD1 but not the nodYABCSUIJ operon; structural analysis of the lipopolysaccharides (LPSs) from symbiotic mutants of Bradyrhizobium japonicum; structural characterization of lipooligosaccharides from Bradyrhizobium japonicum that are required for the specific nodulation of soybean; s… more
Date: August 1, 1991
Creator: Albersheim, Peter & Darvill, A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Bacterial nickel metabolism and storage. Final report for the period January 1, 1999 - March 31, 2002

Description: Nickel is an element required for the growth of many microorganisms, as the metal functions as a key component of a metal center for several enzymes. For the organisms that rely on nickel, the metal must be transported, temporarily stored or sequestered, and then processed by accessory proteins for proper metal center assembly into the designated enzyme. The research conducted for this project addressed the nature and roles of key proteins that are involved in the above Ni-enzyme expression/syn… more
Date: August 15, 2002
Creator: Maier, Robert J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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The structures and functions of oligosaccharins

Description: Abstracts of papers published or in press reporting work supported by this grant proposal during the past year are given here to describe the progress we have made in this research project. Topics include morphogenesis regulation by cell wall oligosaccharins; regulation of pectic enzymes, pathogen interactions with cell wall constituents; oligosaccharins as regulatory molecules; and characterization of oligosaccharide elicitors.
Date: August 1, 1990
Creator: Albersheim, P.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Mechanisms and Determinants of RNA Turnover: Plant IRESs and Polycistrons for Metabolic Engineering

Description: There is a strong need for tools that allow multiple transgenes to be expressed in genetically engineered plants. For the last 30 years it has been believed that nearly all eukaryotic mRNAs were monocistronic, with ribosomes entering at the 5' end and scanning through the 5'UTR to the first AUG codon. It is now clear that perhaps 3% of vertebrate and yeast mRNAs utilize IRESs (Internal Ribosome Entry Sites) within their 5'UTRs to promote the internal entry of ribosomes to mRNAs and subsequent t… more
Date: August 1, 2002
Creator: Meagher, Richard B.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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