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Numerical Techniques For Classifying Forest Communities In The Tennessee Valley, Dennis Michael Mccarthy

Doctoral Dissertations

The main objectives of this study were:

1. To develop a series of vegetational classification systems based on the floristics of community strata, overstory structural functional features, and environmental parameter of a region typical of the temperate Tennessee Valley;

2. To examine the suitability of these classification systems for the complex forests of the Tennessee Valley;

3. To develop numerical tools for evaluating classification suitability;

4. To use these tools to seek out natural discontinuities in vegetational patterns.

To achieve these goals six multivariate cluster analysis programs were examined. Preliminary tests brought out undesirable properties in four of them, however, …

Development Of A Mathematical Model That Will Predict The Mean Daily Dietary Intake Of Pregnant Women Based Upon Sociological, Psychological And Physiological Factors Assumed To Be Related To The Mean Daily Dietary Iron Intake, Waneen Ann Liudahl

Doctoral Dissertations

The purpose of this investigation was to develop a mathematical model using linear stepwise regression analysis that would predict the dietary iron intake of pregnant women. Development of the mathematical model was based upon sociological, psychological and physiological factors assumed to be related to the dietary iron intake of pregnant women.

Fifty-seven pregnant women participated in the study. They were private outpatients of two obstetricians at the Macomb Clinic, Macomb, Illinois.

The dependent variable used in the development of the models was the seven-day mean daily dietary iron intake for each pregnant woman which was obtained during the second and/or …

Intrerconversion Of Replicative Forms Of Sindbis Virus Rna And The Electrophoresis Of Viral Rna, Jonathan D. Martin

Doctoral Dissertations

Three species of double-strand (ds) RNA, designated RF I, RF II, and RF III in order of decreasing size, were produced by RNase treatment of extracts of chicken embryo cells infected for 6 h with Sindbis virus. These species were identifiable with those reported by Simmons and Strauss (28). At a low level of enzyme (0.001 µg/ml) the major species obtained was RF I. When the enzyme concentration was increased 10-, 100, and 1000-fold, there was a progressive increase in the proportions of RF's II and III and a concurrent decrease in the proportion of RF I. Only RF I …

Effects Of 2-Chloroethyl-Phosphonic Acid (Ethephon) As A Male Gametocide For Induction Of Sterility In Wheat And Barley, Jacqueline Taylor Martin

Doctoral Dissertations

Exploitation of induced male sterility has now become a potential tool in plant breeding. Ethephon (2-chloroethyl-phosphonic acid) has induced male sterility in winter cultivars of wheat and barley.

The purpose of this research was to further elucidate the response of winter wheat (Triticum aestivum L. em Thell), and winter barley (Hordeum vulgate L.) to foliar application of ethephon.

Ethephon was foliarly sprayed on winter cultivars of wheat and barley which were Arthur and Blueboy, and Barsoy and Volbar respectively, at 0.05, 0.10, and 0.20 and 0.40 percent active ingredient, when plants were in mid-boot and late boot stages in the …

Nutritional Efficiency Of Angus Cow-Calf Units, Dennis Owen Onks

Doctoral Dissertations

Angus cow-calf pairs were individually fed over a five-year period. Data from 62 mature cows and 114 calves were obtained. Cows varied in initial weight and production potential. Cows were fed grass silage, ad libitum, throughout gestation and lactation. Calves were fed a complete finishing and growing ration post weaning. Efficiency of cow-calf units was defined as the ratio of the yearly TDN intake of the cow plus the pre-and post weaning TDN intake of the calves. Second-order polynomials were fitted through the biweekly efficiency ratios for individual calves and solved to determine the most efficient point. This efficiency was …

Comparison Of Methods Of Selection To Increase Yearling Weight Of Beef Cattle And Assessment Of Influence Of Sire Differences On Estimates Of Repeatability Of Cow Productivity, Thomas Bruce Turner

Doctoral Dissertations

The objectives of this study were: (1) to make a theoretical comparison of progress expected by selecting for a single trait with progress expected by selection based on an index including two traits and (2) to compare estimates of repeatability of cow productivity when the effect of sire is removed from the data and when it is not.

Data were collected over a period of seven years from 581 bull calves and 552 heifer calves from the purebred Angus herd at The University of Tennessee Plateau Experiment Station, Crossville.

Variables recorded at weaning (approximately seven and one-half months of age) …