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Morphological And Isozymal Variation In The Sea-Star Asterias Forbesi(Desor), Charles H. Towle Jr.

Doctoral Dissertations

Kinetic studies of the hydrogenation of carbon monoxide to methane and methanol were carried out over iron-titanium alloy catalysts, in a continuous flow fixed bed differential reactor. The catalysts studied included FeTi, Fe(,1.5)Ti and Fe(,2.5)Ti alloys with pure Fe used as a comparison. The catalysts used were all unsupported with an averaged initial particle size of 270 microns. The range of feed compositions was varied from 10 to 33% CO with the remainder being H(,2). Temperatures were varied from 520 to 590 K at a total pressure of 34 atm for all the catalysts studied. Additionally, a pressure of 13.6 …

Major Histocompatibility Complex (Mhc) Vs Non-Mhc Influences On Response To Rsv-Induced Tumors In Chickens, David Winston Brown

Doctoral Dissertations

The MHC of the chicken (B complex) has been shown to exert a decisive influence on the fate of Rous sarcoma virus (RSV)-induced tumors. However, noninbred chickens with identical B genotypes and inbred lines indistinguishable at the MHC have demonstrated considerable variation in response to RSV challenge. The major objective of this research was to determine the cause of variation in anti-Rous sarcoma response observed among chickens with "identical" B genotypes.

Chickens were evaluated for anti-tumor response following wingweb inoculation with RSV at six weeks of age. A comparison of anti-sarcoma responses of (15I-5 x 6-1)F1 versus (15I-5 x 7-2)F1 …

Genetic Efficiency In Two Loblolly Pine (Pinus Taeda L) Seed Orchards, Sharon Theresa Friedman

Doctoral Dissertations

The degree to which seed crops in seed orchards reflect the genetic variability and superiority present among orchard parents (genetic efficiency) was examined in two loblolly pine seed orchards using seven allozyme loci as genetic markers.

The frequency of outcrossed progeny in the seed crop was estimated using unique markers, a single locus mixed mating model, and a multilocus model. These estimates were 0.982, 0.992, and 0.994, respectively. Thus, selfing did not contribute significantly to deviations from genetic efficiency in these orchards.

Pollen contamination, on the other hand, was found to have a significant impact on genetic efficiency. Unique markers …