Index Catalog // ScholarsArchive@OSU

Exposure and health risk assessment for farmers occupationally exposed to chlorpyrifos in Sri Lanka and drinking water and house dust analysis for chlorpyrifos

Creator:: Aponso, G. Lalith M.
Abstract:: This study was designed to assess chiorpyrifos exposure of a group of farmers by determining internal dose associated with a given application of this insecticide. This involved the monitoring of urinary levels of 3,5,6 trichloro-2-pyridinol (TCP), the major metabolite of chlorpyrifos. Incidental exposure was evaluated by determining the levels of...
Resource Type:: Dissertation
Full Text:: for applying a chlorpyrifos EC formulation. The amount of chemical applied, time required, and the

Spinal control differences between the sexes

Creator:: Johnson, Samuel T.
Abstract:: Despite years of research, females continue to have a higher incidence of non-contact ACL injuries. One of the major findings of this research is that males and females perform certain tasks, such as, cutting, landing, and single-leg squatting, differently. In particular, females tend to move the knee into a more...
Resource Type:: Dissertation

Protein-protein interactions in the bacteriophage T4 dNTP synthetase complex

Creator:: Shen, Rongkun
Abstract:: The enzymes of dNTP synthesis in T4 infection associate to form a multienzyme complex, the T4 dNTP synthetase complex, facilitating the flow of metabolites en route to dNTPs, and their subsequent flow into DNA. Study of protein-protein interactions helps one to understand how the enzymes in the complex are organized...
Resource Type:: Dissertation

Improving student satisfaction and retention with online instruction through systematic faculty peer review of courses

Creator:: Aman, Richard R.
Abstract:: The purpose of the study was to determine if online courses that were faculty peer reviewed based on five factors of quality instruction resulted in increased levels of student satisfaction and higher rates of student retention when compared with nonreviewed courses in a post-secondary context. The five factors of quality...
Resource Type:: Dissertation

Evaluation of bacterial community indicators of stream sanitary and ecological condition

Creator:: Bracken, Caragwen L.
Abstract:: The focus of this research was to develop bacterial community indicators of stream sanitary and ecological condition. The first study compared substrate utilization patterns between centrifuged and uncentrifuged split samples. We found a shift in the relative proportion of each group of bacteria following centrifugation, with a marked increased in...
Resource Type:: Dissertation
Full Text:: (FC), E. coli (EC), and the maximum Biolog Average Well Color Development (Max AWCD) and percent

Benthic biological invasions in two temperate estuaries and their effects on trophic relations of native fish and community stability

Creator:: Castillo, Gonzalo C.
Abstract:: The extent of biological invasions, their role on the feeding of native fishes and their impact on community stability were investigated in Alsea Bay and Yaquina Bay, two estuaries on the central Oregon coast, USA. Most nonindigenous species (NIS) introduced in these intermediately invaded estuaries are considered byproducts of culturing...
Resource Type:: Dissertation

Effects of disturbance modes on mycorrhizal fungus communities at Crater Lake National Park

Creator:: Trappe, Matt
Abstract:: Crater Lake National Park presents an excellent opportunity for ecological research due to its relatively pristine landscape, the protection of its natural features, its infrastructure, and a Park administration supportive of scientific inquiry and restoration ecology. The research presented here examines the responses of fungi to various forms of perturbation....
Resource Type:: Dissertation

Quantification and reactivity of cellulose reducing ends : implication for cellulose

Creator:: Kongruang, Sasithorn
Abstract:: The primary purpose of this study was to (1) develop methods for the analysis of and (2) provide information on the chemical nature of reducing ends in typical cellulose substrates used for the study of cellulolytic enzymes. The studies were designed such that values obtained for cellulose substrates were compared...
Resource Type:: Dissertation
Full Text:: IF-l-P -* Fru-hi Figure 2.5. Pathways of carbon metabolism in A.xylinum. CS, cellulose synthase (EC

Total synthesis of (-)-7-epicylindrospermopsin

Creator:: Hansen, Joshua D.
Abstract:: The first asymmetric synthesis of (-)-7-epicylindrospermopsin via intramolecular nitrone cycloaddition is described. The synthesis utilized a convergent approach to prepare the cycloaddition precursor 176, which was assembled by condensation of hydroxylamine 175 with aldehyde 145. Hydroxylamine 175 was synthesized from ethylene glycol (166) in seven steps. Aldehyde 145 was completed...
Resource Type:: Dissertation
Full Text:: 50 ec at pH 7. After 10 weeks at 50 ec, an aqueous solution of cylindrospermopsin had degraded to 57

Overexpression of antioxidant genes in transgenic tomato tolerant against multiple stresses

Creator:: Wang, Yueju
Abstract:: The effect of increased manganese superoxide dismutase (Mn-SOD) and cytosolic ascorbate peroxidase (cAPX) on various abiotic stresses was studied using transgenic tomato (Lycopersicon esculentum) plants. Transformants were selected in vitro based on kanamycin resistance, confirmed by PCR and northern blot analyses. Northern blots showed an enhanced gene expression of Mn-SOD...
Resource Type:: Dissertation
Full Text:: [e.g., superoxide dismutase, (SOD, EC 1.15.1.1) and ascorbate peroxidase (APX, EC 1.11.1.11)] and non

ScholarsArchive@OSU

Exposure and health risk assessment for farmers occupationally exposed to chlorpyrifos in Sri Lanka and drinking water and house dust analysis for chlorpyrifos

Spinal control differences between the sexes

Protein-protein interactions in the bacteriophage T4 dNTP synthetase complex

Improving student satisfaction and retention with online instruction through systematic faculty peer review of courses

Evaluation of bacterial community indicators of stream sanitary and ecological condition

Benthic biological invasions in two temperate estuaries and their effects on trophic relations of native fish and community stability

Effects of disturbance modes on mycorrhizal fungus communities at Crater Lake National Park

Quantification and reactivity of cellulose reducing ends : implication for cellulose

Total synthesis of (-)-7-epicylindrospermopsin

Overexpression of antioxidant genes in transgenic tomato tolerant against multiple stresses

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