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Full-Text Articles in Life Sciences
Effects Of Microcystin-Lr On Channel Catfish (Ictalurus Punctatus) Susceptibility To Microbial Pathogens (Aeromonas Hydrophila And Edwardsiella Piscicida), Alison Marchant
Theses and Dissertations
Microcystin-LR is a hepatotoxin produced by cyanobacteria. Aeromonas hydrophila and Edwardsiella piscicida infections are leading causes of losses in market-sized channel catfish (Ictalurus punctatus). These older fish should have natural immunity in place and a predisposing factor is likely a prerequisite for these disease outbreaks. While microcystin-LR rarely causes mortality in warm-water aquaculture, we believe it may be a predisposing factor that leads to bacterial disease outbreaks during the summer months due to its ability to damage the liver. Our study investigated microcystin-LR’s effects on channel catfish susceptibility to these pathogens. We found that a sublethal dose of microcystin-LR induced …
Delineation Of Aeromonas Hydrophila Pathotypes By Dectection Of Putative Virulence Factors Using Polymerase Chain Reaction And Nematode Challenge Assay, John Metz
Master of Science in Integrative Biology Theses
Aeromonas hydrophila is a Gram-negative, bacterial pathogen of humans and other vertebrates. To delineate pathotypes, the genomes of twenty-eight Aeromonas isolates were screened by PCR to determine the presence of virulence factors including: aerolysin (aerA), cytotoxic enterotoxin (act), hemolysin (ahh1), elastase (ahyB), enolase (eno), S-layer protein (ahsA), serine protease (ser), Type IV Aeromonas pilus (tapA), lipase (lip), and Type Three Secretion System (T3SS) components (aopB, ascV). Genes for ahh1, lip, ser, and ahyB …
The Ecology And Natural History Of The Northern Leopard Frog, Rana Pipiens Schreber, In West Virginia, William Bradley Sutton
The Ecology And Natural History Of The Northern Leopard Frog, Rana Pipiens Schreber, In West Virginia, William Bradley Sutton
Theses, Dissertations and Capstones
The purpose of this study was to gather ecological and life history data for the Northern Leopard Frog, Rana pipiens Schreber, in West Virginia. In Chapter 1, natural history data, such as morphometrics (larval and adult), dorsal coloration, and emergence time were recorded. In Chapter 2, it was discovered that Aeromonas hydrophila and Pseudomonas ssp. skin infections affecting R. pipiens could be identified using BIOLOG analysis. The scope of Chapter 3 was to analyze habitat partitioning between 3 sympatric anurans (R. pipiens, R. catesbeiana, and R. clamitans melanota). The following habitat partitioning gradient was discovered. Rana …
Aspects Of The Biology Of Aeromonas Hydrophilia With Respect To The Striped Mullet, Mugil Cephalus L. In The St. Johns River, Gerald E. Fensch
Aspects Of The Biology Of Aeromonas Hydrophilia With Respect To The Striped Mullet, Mugil Cephalus L. In The St. Johns River, Gerald E. Fensch
Retrospective Theses and Dissertations
The aspects of the biology of Aeromonas hydrophila with respect to a striped mullet (Mugil cephalus L.0 nursery were examined. A. hydrophila density in the natural water was found to be strongly correlated with turbidity and weakly correlated with water temperature. No correlations were found between A. hydrophila density and water depth, dissolved oxygen, pH, total alkalinity, specific conductivity, or phytoplankton chlorophyll concentration. A. hydrophila density/g dry weight of stomach content were found to be correlated with chlorophyll concentration/g dry weight stomach content. The survivability of striped mullet after capture was found to be primarily related to stress. Stressed striped …