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Environmental Effects On Fish Escape Responses: Impact Of Flow On The Escape Performance Of The Hawaiian Stream Goby, Sicyopterus Stimpsoni, Kelly Diamond
All Theses
The ability of fish to escape from predators is a critical behavior for their survival. Experimental measurements of escape performance in fishes have typically been based on trials conducted in still water; however, such environmental conditions are rare in nature due to waves and currents that expose fishes to unsteady and/or directional flow. I examined the effects of water flow and predator attack direction on the escape behavior of fish, using juveniles of the amphidromous Hawaiian goby Sicyopterus stimpsoni as a model system. In nature, these fish must escape ambush predation by the Hawaiian sleeper, Eleotris sandwicensis, while exposed …
Biomechanical Testing Of Salter-Harris Fractures Type I And Ii In The Distal Femur And Proximal Tibia, Margeaux Rogers
Biomechanical Testing Of Salter-Harris Fractures Type I And Ii In The Distal Femur And Proximal Tibia, Margeaux Rogers
All Theses
Salter-Harris fractures of the proximal tibia and distal femur are common in pediatric patients that present to orthopedic surgeons. Salter-Harris type I fractures are characterized by breaks that extend only through the physis while Salter-Harris II fractures are the most common, accounting for 85% of Salter-Harris fractures, and extend past the growth plate, exiting through the metaphyseal bone1. Fixation of these fracture types can be accomplished using a variety of methods including the use of Kirschner wires, cannulated screws, and a combination of both materials. Stability of fracture fixation is of utmost importance as persistent motion at the fracture margin …
Femoral Loading Mechanics In Virginia Opossums (Didelphis Virginiana): Torsion And Mediolateral Bending In Mammalian Parasagittal Locomotion, William Gosnell
Femoral Loading Mechanics In Virginia Opossums (Didelphis Virginiana): Torsion And Mediolateral Bending In Mammalian Parasagittal Locomotion, William Gosnell
All Theses
Studies of limb bone loading in terrestrial mammals have typically found anteroposterior bending to be the primary loading regime, with torsion contributing minimally. However, previous studies have focused on large, cursorial eutherian species in which the limbs are held essentially upright. Recent in vivo strain data from the Virginia opossum Didelphis virginiana, a marsupial that uses a crouched rather than upright limb posture, have indicated that its femur experiences moderate torsion during locomotion as well as strong mediolateral bending. The elevated femoral torsion and strong mediolateral bending observed in opossums (compared to other mammals) might result from external forces such …