Life Sciences Commons^™

Forest Communities Of The Great Valley Of East Tennessee And Their Relationship To Soil And Topographic Properties, William Haywood Martin

Doctoral Dissertations

The complex physiographic and climatic history of the Great Valley of East Tennessee has resulted in development of diverse alternating ridge and valley land forms and soils which provide equally diverse forest habitats.

The objectives of this study were (1) to quantify certain topographic features, (2) to analyze statistical relationships of vegetation and tree taxa to selected soil properties and topographic features, (3) to assess magnitude and predictability of these relationships, (4) to document taxonomic diversity of tree taxa, (5) to document and delimit contemporary forest communities and describe interactions with soil-site properties, and (6) to consider relationships of these …

An Investigation Of Some Of The Environmental And Edaphic Factors Effecting The Detoxification And Subsequent Degradation Of An Herbicide, Butachlor, Douglas D. Baird

Doctoral Dissertations

The influence of specific edaphic environmental factors on the detoxication and subsequent degradation of N-Butoxymethyl-2-chloro-2', 6' diethylacetanilide (butachlor) was evaluated under greenhouse and growth chamber conditions. Detoxication of butachlor, as measured by bioassay with barnyardgrass, was significantly enhanced by increasing temperatures to 32 C, making the soil alkaline, flooding, introducing relatively high levels of organic matter and by allowing exposure of more than four weeks. Total degradation of butachlor to C0₂ was enhanced also by high temperatures and length of exposure but was inhibited to a certain extent by flooding. Soil produced metabolites, of which three were soluble in …

An Explanation For The Apparent Effect Of Cod Liver Oil On Sulfur Metabolism In The Albino Rat, Jayne Tigert Morris

Doctoral Dissertations

An interaction between inorganic sulfur and cod liver oil (CLO) has been proposed in the normal metabolism of the albino rat after a gross malformation of the hind limbs was observed in rats fed a diet low in sulfate and without CLO. The rats were fed these diets from the time they were two weeks of age through the seventh week of life. Toward the end of this period, the fourth week after weaning, the lesion was observed. The study included four basic variations of a diet low in sulfate: with and without CLO and with and without vitamin E. …