Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 25 for “"Chemistry, Agricultural"”.
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Behavioral Responses of Diabroticite Beetles to Selected Olfactory and Visual Cues (Coleoptera: Chrysomelidae)
The experiments described in this dissertation were designed to identify selected visual and chemical cues used by adult beetles in the section Diabroticite (Coleoptera, Chrysomelidae, Galerucinae, Luperini, Diabroticina) (Smith and Lawrence, 1967) for identifying host plants, and to identify …
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The Analysis, Characterization and the Chemical Syntheses of C(20) and C(22) Cyclic Fatty Acid Monomers Formed in Heated Fish Oil
Chemical synthesis of C$\sb{20}$ and C$\sb{22}$ CFAMs was carried out to enable (1) the determination of their physical and chemical properties, (2) to provide standards for the identification and characterization of CFAMs present in heated fish oils and (3) to make available pure standards for use …
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Investigation of Melt Electrical Conductance in Food Extrusion
Increase in both the feed rate and the screw speed decreased the mean residence time but the feed rate effect was more pronounced. The specific feeding load, barrel fill and flow profile were affected by the feed rate and the screw speed in opposite directions. Spread of the normalized RTD …
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Comprehensive Evaluation of Kenaf as an Alternative Fiber for Paper and Wood Composites
Kenaf-aspen boards produced lowest values for linear expansion although no significant factor contributed towards linear expansion. Homogeneous boards performed better in linear stability than the 3-layered boards. Higher percentage of kenaf flakes gave lower values for linear recovery, thickness …
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The Influence of Gonadotropin-Releasing Hormone on Pubertal Development of Dairy Bulls (Reproduction, Prepubertal, Lh, Testosterone)
The purpose of this investigation was to determine if the administration of GnRH to immature Holstein bulls would increase the secretion of luteinizing hormone (LH), necessary for pubertal development. Preliminary experiments investigated the sensitivity of GnRH potency to storage up to one month …
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Novel natural product based anti-anxiety therapy and natural insecticides
The EtOH extracts of the leaves of Margraviaceae, a relatively rare Central American vine for which ethnobotanical reports suggested possible anti-anxiety properties, showed significant anti-anxiety activity in animal models for anxiety. Subsequent bioassay-guided fractionation of these extracts …
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Characterization of Denitrification and Leaching Losses of Fertilizer Nitrogen From Soil (Evolution, Isotope, Nitrous Oxide, Dinitrogen)
Quantification of leaching and denitrification losses of fertilizer N from soil requires that appropriate methods be developed for their measurement. The objectives of this work were to: (1) evaluate potential errors in measuring denitrification by use of ('15)N-tracer techniques recently developed …
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Dissipation and potential crop injury for soil applied clomazone, chlorimuron, imazaquin, and imazethapyr
Cultural practices such as tillage and method of application can influence herbicide persistence, dissipation processes, and subsequent crop injury. In field studies, the influence of tillage system and herbicide application method on dissipation rate and potential for injury to corn (Zea mays) was …
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Enzyme-linked immunosorbent assay for herbicide detection
The purpose of this research was to develop polyclonal antibodies to the soybean herbicides clomazone (2- ((2 chlorophenyl)methyl) -4,4-dimethyl-3-isoxazolidinone), imazaquin (2- (4,5-dihydro-4-methyl-4-(1-methylethyl)-5-oxo-1H-imidazol-2-yl) -3-quinolinecarboxylic acid), and metribuzin …
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Efficacy of glufosinate and weed control in transformed corn and soybean
Glufosinate is a postemergence herbicide that inhibits the glutamine synthetase enzyme in plants, causing an accumulation of ammonia, inhibition of photosynthesis, and ultimately plant death. The use of this herbicide has been limited to no-tillage prior to planting or in noncrop areas. Recent …
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Evaluation of nitrogen availability indices
Both economic and environmental concerns dictate that N fertilizer be applied to optimize crop production and minimize potential for movement of N into surface and/or ground water resources. Field and laboratory studies were conducted to evaluate factors affecting the reliability of recommendations …
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Evaluation of agricultural beneficial management practices: Cattle access restriction to surface waters subsurface tile drainage management
… in Eastern Ontario on typical small scale agricultural practices. The first part evaluates the impact of a conventional pasture system and an excluding pasture system on surface water quality. The three year study compared water quality endpoints such as: indicator bacteria, pathogens, …
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Effects of structural iron oxidation state on the hydraulic conductivity and potassium fixation of smectite clays and soils
Restricted to the U of I community indefinitely during batch ingest of legacy ETDs
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Development of a Remote Sensing-Based Agriculture Monitoring Drought Index and Its Application Over Semi-Arid Region
Agricultural drought is a natural disaster that usually occurs when the available water content goes below the optimal needs of the proper growth of plants during its growing season. It has enormous impacts on economic, environmental, and social sectors. In this study, our overall objective was to …
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Sustainability of the Indus Basin: Impact of tertiary salinity/sodicity on wheat productivity, damage assessment and future public policy
The Indus Basin of Pakistan has the largest contiguous canal irrigation system in the world. However, the canal system, as important as it is, has overshadowed the equally important supplementary source of irrigation in the Basin--the groundwater. Today, over 40% of the annual irrigation …
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Characterization of chemically fixed nitrogen-15-labeled liquid anhydrous ammonia and of biologically immobilized nitrogen-15 in typical Illinois mollisols
An investigation was carried out into the chemical nature and further transformation of fixed liquid anhydrous NH$\sb3$ with emphasis on chemical fixation of NH$\sb3$ by soil organic matter. For this purpose, $\sp{15}$N-labeled liquid anhydrous NH$\sb3$ was injected into a Drummer soil. The fixed …
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Photodynamic Herbicide Modulators
Fourteen chemicals some of which having known chlorophyll biosynthetic modulating activities were tested for photodynamic herbicidal properties on the two major greening group of plants, i.e. the DDV/LDV and DMV/LDV groups. The following conclusions were made: (1) Cucumber, a DDV/LDV plant species, …
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Nuclear magnetic resonance studies of corn zeins and other byproducts of corn wet milling: Dynamic and structural basis of functionality
"Nuclear Magnetic Resonance (NMR) relaxation and spectroscopy techniques were used to evaluate the hydration properties and mobility of ""bound"" water in corn zein solutions and samples of corn gluten meal (CGM) and corn germ meal (CGRM). Multinuclear relaxation measurements using $\sp1$H, $\sp2$H …
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Chemical composition and fiber structure as factors affecting fiber fermentation
Procedures used to hydrolyze plant polysaccharides to their monomeric components were compared and a high performance liquid chromatographic (HPLC) technique for the analysis of monosaccharides was developed. Procedures using sulfuric acid as the hydrolytic agent were superior compared to a …
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A study of kernel composition affecting the quality ofshrunken2 sweet corn
"The research in this thesis is made up of three related experiments each concerned with the various chemical components that contribute to eating quality in shrunken2 (sh2) sweet corn (Zea mays L.) kernels. In each experiment, the primary focus was on the levels of dimethyl sulfide (DMS), the …
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