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The Effect Of Propylthiouracil And Thyroid Powder On The Restoration Of Certain Components Of The Liver After Partial Hepatectomy In The Rat, Charles Major

Doctoral Dissertations

Summary:

The effect of the administration of thyroid powder and propylthiouracil in a forced feeding regimen upon the restoration of certain components of the rat liver has been studied at fourteen, twenty-four, and forty-eight hours after partial hepatectomy in the rat. Cellularity was determined and found to be highest in the thyroid group, intermediate in the controls, and lowest in the propylthiouracil group, both at operation, and throughout the subsequent regeneration. All groups declined in cellularity after the operation with only the thyroid group showing a significant return towards normal by the forty-eighth hour.

After the operation RNAP per cell, …

Ground Vegetation Patterns Of The Spruce-Fir Area Of The Great Smoky Mountains National Park, Dorothy Louise Crandall

Doctoral Dissertations

Introduction: Although the spruce-fir area of the Southern Appalachians has interested several investigators, there have been few studies of the herbaceous plants in relation to the canopy and none with this relationship as the primary objective. Ecological surveys have been made by Cain (1931, 1935), Oosting and Billings (1951), and Whittaker (1956), but their papers do not report details in reference to site types and include rather limited material on the ground cover. Possible site types were mentioned by Whittaker but were not described and few supporting data of an objective nature were included.

Cain in his 1935 paper on …

Electrophysiological And Electrolyte Changes In Frog Striated Muscle After Irradiation, Edgar B. Darden Jr.

Doctoral Dissertations

Introduction: Abbreviated

In the present work, evidence is presented that radiation injury in excised frog muscle may be very early reflected in a loss of membrane potential which occurs at loci more or less randomly distributed over the fibers available for impalement; i.e., the superficially located fibers. The number and severity of these electrical lesions increase with time and with dose and appear to be strongly influenced also by the temperature of the surroundings. Concurrently, potassium leakage is presumably occurring at these lesions, for in time a net loss of K can be demonstrated by gross analysis of the muscle …

Plant Microfossils From The Bruhn Lignite, Robert E. Mclaughlin

Doctoral Dissertations

Introduction: The collection and preliminary examination of fossiliferous material from West Tennessee, begun in the fall of 1952 with the aid and encouragement of Dr. A. J. Sharp, convinced the writer that the opportunity to extend present knowledge of early vegetational history in the area was substantial. Despite the fact that the region west of the Tennessee River has yielded a considerable amount of plant fossil evidence, mainly in the form of leaf impressions, many unsolved problems remain.

From the botanical point of view, the identification of fossil plants based on the single criterion of leaf morphology, as has been …

A Study Of Some Of The Metabolic Aspects Of Host-Parasite Interaction Using The Baby Chick And Salmonella Pullorum, Elmo Sharber Dooley

Doctoral Dissertations

No abstract provided.

Natural Replacement Of Chestnut By Other Species In The Great Smoky Mountains, Frank W. Woods

Doctoral Dissertations

Summary: (1) Prior to the beginning of this century, chestnut (Castanea dentata) was one of the most important forest trees in the eastern United States. It ranged from New England to Georgia, reaching greatest abundance and best form in the mountains of Tennessee and North Carolina. In 1904, the chestnut blight was discovered in New York. Within the next 40 years, the causal fungus (Endothia parasitica) introduced from Asia on blight-resistant species of chestnut, virtually eliminated chestnut as a member of the deciduous forest complex of the eastern United States.

(2) Being a great distance from …