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Articles 1 - 6 of 6
Full-Text Articles in Life Sciences
Mechanisms Of Freeze Avoidance In Eggs Of The Antarctic Naked Dragonfish (Gymnodraco Acuticeps) And Atlantic Tomcod (Microgadus Tomcod), Jeremy M. Carlson
Mechanisms Of Freeze Avoidance In Eggs Of The Antarctic Naked Dragonfish (Gymnodraco Acuticeps) And Atlantic Tomcod (Microgadus Tomcod), Jeremy M. Carlson
Student Honors Theses
A remarkable number of marine teleosts belonging to the perciform suborder Notothenioidei and the paracanthopterygian suborder Gadoidei (cods and their allies) have evolved biophysical and physiological adaptations that promote freeze avoidance to temperatures as low as 1oC below the equilibrium freezing point of their body fluids (Cheng et al. 2003; Costanzo et al. 1995; Howes 1991; Raymond and DeVries 1977). Among the Notothenioids endemic to the Antarctic Ocean, the naked dragonfish (Gymnodraco acuticeps, Figure 1) inhabits the ice-laden waters near McMurdo Sound where the annual water temperature remains stable at -1.87 ± 0.1oC (Komatsu et al. 1970; Bargelloni et al. …
Taking The Road Most Travelled: Understanding Patterns Of Snake (Colubridae; Storeria) Movement And Road Mortality In A State Park, Iwo P. Gross
Student Honors Theses
Roadways negatively affect their surrounding ecosystems through the contamination of air, water, and soil resources, the dissection of populations and habitat areas, and the direct mortality of several fauna. My study assessed the significance of a number of variables that might influence the temporal and spatial patterns of road mortality in a population of Midland Brownsnakes (Storeria dekayi wrightorum). I utilized passive sampling techniques and roadwalking surveys to collect individual snakes from a road during their biannual migrations from lowland activity areas to upland forests where they hibernate. I discovered that sexually biased behavioral and natural history traits impacted an …
Seed Germination And Seed Bank Of Scutellaria Species, Jennifer O'Brien
Seed Germination And Seed Bank Of Scutellaria Species, Jennifer O'Brien
Student Honors Theses
Florida skullcap, Scutellaria floridana Chapm. (Lamiaceae), is a federally threatened species found in the Florida Panhandle. Its habitat is a fire-prone, longleaf pine forest dominated by Aristida stricta Michx. var. beyrichiana (wiregrass). Other Scutellaria species used in the study are found in southeastern U.S., including two within the Florida Panhandle. The objective of this study was to compare several techniques to germinate seeds of Scutellaria incana, Scutellaria lateriflora, Scutellaria ovata ssp. ovata, and Scutellaria floridana, and to access the presence of a seed bank for S. floridana. For the germination study, Scutellaria lateriflora and S. ovata ssp. ovata were stratified …
Intracellular Expression Of An Ice Nucleation Protein Reduces Cryoinjury In Insect Cells, Avril M. Harder
Intracellular Expression Of An Ice Nucleation Protein Reduces Cryoinjury In Insect Cells, Avril M. Harder
Student Honors Theses
Exposure of insect cells to subzero temperatures typically leads to cell membrane disruption and lethal intracellular ice formation. This study seeks to examine the cryoprotective value of trangenically expressing a bacterial ice nucleation protein (INP) in Spodoptera frugiperda (Sf-21) cells. The bacterium Pseudomonas syringae naturally produces a membrane-bound INP (inaZ), capable of structuring water and initiating ice formation at temperatures as high as -2 °C. I hypothesized that intracellular expression of an altered form of inaZ (PsINP) in Sf-21 cells will mediate highly regulated ice nucleation when cells are cooled to -80 °C in a slow, controlled manner, …
Edge Influence On Reproductive Success Of Symphoricarpos Orbiculatus, Breanne M. Nott
Edge Influence On Reproductive Success Of Symphoricarpos Orbiculatus, Breanne M. Nott
Student Honors Theses
With continued forest fragmentation, edge effects play an important role in shaping the structure and composition of plant communities. Some forest plant species exhibit increased abundance at forest edges, while other species have a negative edge response. Despite welldocumented edge effects, there are few studies that document the underlying effects on population dynamics of individual species that result in edge responses. Two mechanisms may generate differential distribution of a species across an edge. Edges may 1) alter population demographics by influencing the plant’s uptake and allocation of resources, or may 2) influence the spatial pattern of seed dispersal. Coral berry …
Respiratory Effects Of 1-Propylxanthine On Neonatal Rats, Amanda Hance
Respiratory Effects Of 1-Propylxanthine On Neonatal Rats, Amanda Hance
Student Honors Theses
Neonatal apnea is commonly treated by methylxanthines like caffeine or theophylline, but these drugs have the potential to create serious side effects. As an alternative, a new xanthine analog, 1-propylxanthine (1-PX), was recently synthesized at Eastern Illinois University. The respiratory effects of 1-PX were investigated in 4- to 7-day-old rats to determine if 1-PX could be a respiratory stimulant. Each rat was placed in a heated body plethysmograph, and its respiratory rate and volume were measured using a flow transducer, pneumotachograph, and Power Lab data acquisition system. After a 10-min control period, the rat was given a s.c. dose of …