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Interactions Between Two Key Amphibian Defenses To Batrachochytrium Dendrobatidis In Panamanian Glass Frogs (Espadarana Prosoblepon), Andi Levorse
Honors Theses
Research on the amphibian pathogen Batrachochytrium dendrobatidis (Bd), the causative agent of the lethal disease chytridiomycosis, has advanced from assessments of pathogenicity and species susceptibility to more specialized questions concerning the complex interactions between the pathogen, species-specific immune responses, and the environment. Our work examines the potential for interactions between the two most important innate immune defenses of frogs against Bd: secretions of antimicrobial peptides and communities of commensal cutaneous bacteria. While both defenses have been studied individually, little data are available to examine interactions between these defenses. We conducted our study with field captured Panamanian glass frogs …
Chondrocranial And Oral Morphology Of Pipoid Frogs, Charles Christopher Swart
Chondrocranial And Oral Morphology Of Pipoid Frogs, Charles Christopher Swart
Master's Theses
The Pipoidea are a diverse group of frogs. Their diversity is demonstrated in their morphology, ecology, and behavior. One pipoid species, Xenopus laevis, has been used as a model system of developmental, physiological, and molecular studies of vertebrates. My work has focused on the developmental morphology of the chondrocranium and oral morphology of four pipoid taxa: Hymenochirus boettgeri, Rhinophrynus dorsalis, Pipa carvalhoi, and Xenopus laevis. Previous studies have suggested that the Anura may be diphyletic based on the unique characteristics of the chondrocanial morphology of pipoids. The chondrocranial and internal oral morphology of the pipoids indicates that as a group …
Electrical Response Of Frog Skin Epidermis To Sodium Ions, James H. Martin
Electrical Response Of Frog Skin Epidermis To Sodium Ions, James H. Martin
Master's Theses
Presently, the theory is held that the total frog skin potential (P.D.) is generated within the epidermis at two borders, the "outer border" and the "inner border, " which are said to be specifically permeable to Na+ and K+, respectively. This thesis concerns itself only with the electrical response of the "outer border" to varying Na+ concentrations in the solutions at the epidermis, [Na+]o. Contrary to expectation from the Nernst equation, the P.D. changes by only 17 to 35 mV, instead of theoretically 58 mV upon a 10 fold change in [Na …
A Comparison Of The Blood Oxygen Capacity In Semi-Terrestrial And Aquatic Frogs, Francis Burke Leftwich
A Comparison Of The Blood Oxygen Capacity In Semi-Terrestrial And Aquatic Frogs, Francis Burke Leftwich
Master's Theses
The present investigation is a comparison of the blood oxygen capacity in three species of frogs: a semi-terrestrial form R. pippins, the meadow frog; and two aquatic forms, R. clamitans, the green frog; and R. catesbeiana, the bullfrog. The habitats or these frogs are described by Wright and Wright (1949) as follows: R. pipiens inhabits swampy marsh lands, upland backwaters, overflows, and ponds in the spring. In summer it is found in swamp lands, grassy woodlands, or in cultivated hay and grain fields. In winter it hibernates in pools or marshes. It has been found as far as …