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Demography And Disease Of The Rare Shrub Buckleya Distichophylla (Santalaceae) In Northeastern Tennessee, William Seth Ratliff
Demography And Disease Of The Rare Shrub Buckleya Distichophylla (Santalaceae) In Northeastern Tennessee, William Seth Ratliff
Undergraduate Honors Theses
Piratebush (Buckleya distichophylla (Nutt.) Torr.) is a rare, hemiparasitic shrub with the only extant populations in western North Carolina, northeastern Tennessee, and southwestern Virginia. The preferred natural hosts of piratebush, Carolina and eastern hemlocks, have seen sharp declines over the last decade due to the invasive hemlock woolly adelgid. Virginia pine, another important host of piratebush, is also susceptible to disease, specifically Cronartium appalachianum, a rust fungus for which piratebush is the secondary host. This study described and analyzed current demographic parameters of three Tennessee piratebush populations. Additionally, spatial patterns of disease and demographic characters were analyzed. These …
The Effects Of Sustained, High-Velocity Exercise On Gene Expression In California Yellowtail (Seriola Lalandi), Kelli Hatter
The Effects Of Sustained, High-Velocity Exercise On Gene Expression In California Yellowtail (Seriola Lalandi), Kelli Hatter
Undergraduate Honors Theses
California Yellowtail muscle fibers have been observed to exhibit two drastically different development patterns resulting from the speeds at which they are exercised. When fish are exercised at a moderate rate their epaxial fast-twitch muscle fibers grow in diameter—hypertrophy; when they are exercised at a fast speed, more new epaxial fast-twitch muscle fibers are produced—hyperplasia. To determine the underlying reason for this difference in muscle development, my summer research project and honors thesis exercised fish at: fast, moderate, and control speeds for a sustained amount of time to determine what is happening on a cellular level to cause the observed …
Mechanisms Of Axial Polarity Modification During Postembryonic Development Of The Basal Bilaterian Convolutriloba Macropyga, Laura N. Crowther, James M. Sikes Ph.D.
Mechanisms Of Axial Polarity Modification During Postembryonic Development Of The Basal Bilaterian Convolutriloba Macropyga, Laura N. Crowther, James M. Sikes Ph.D.
Undergraduate Honors Theses
Acoel flatworms have varied modes of asexual reproduction that involve dramatic postembryonic modification of their anterior-posterior (AP) axis. The acoel species Convolutriloba macropyga reproduces through a reversed polarity budding process in which offspring develop from two posterior budding sites with a complete reversal of the AP axis compared to the parent. Reversed polarity budding is preceded by the development of a zone of tissue with disorganized musculature that is incapable of regeneration, suggesting a transient loss of axis polarity at each budding site. For this reason, these tissues are titled the polarity transition zone (PTZ). While this alteration of existing …
Establishing The Dance Floor: Frame Manipulation Experiments, Peter D. Suich
Establishing The Dance Floor: Frame Manipulation Experiments, Peter D. Suich
Undergraduate Honors Theses
Past studies of honey bee populations, in both natural and laboratory settings have allowed researchers to elucidate the dance language of honey bees within the hive. While the intent and meaning of the waggle dance is thoroughly understood, the area within the hive on which the bees dance is poorly understood. Several factors that may contribute to waggle dancing were studied: substrate, scent and hive entrance proximity. Two separate honey bee colonies were placed in three-frame observation hives. After establishing the dance floor, new experimental conditions were introduced by changing the position of the frames and watching for three days …