Open Access. Powered by Scholars. Published by Universities.®
Articles 1 - 3 of 3
Full-Text Articles in Life Sciences
Physiology, Enzyme Production, And Zoospore Behavior Of Balrachochytrium Dendrobatidis, A Chytrid Pathogenic To Amphibians, Jeffery Scott Piotrowski
Physiology, Enzyme Production, And Zoospore Behavior Of Balrachochytrium Dendrobatidis, A Chytrid Pathogenic To Amphibians, Jeffery Scott Piotrowski
Electronic Theses and Dissertations
Balrachochytrium dendrobatidis is a pathogen of amphibians that has caused severe population declines on several continents, and little is known about the conditions that favor epidemics. The zoospore activity, temperature, and pH requirements of B. dendrobutidis were investigated to help understand the ecology and transmission of this pathogen. Over 95% of the chytrid's zoospores stop moving in less than 24 hours, and the zoospores swam less than 2 cm before encysting on tryptone agar. B. dendrobutidis zoospores were not attracted to tryptone, gelatin hydrolysate, casamino acids, keratin, gelatin, glucose, or lactose. The chytrid grew and reproduced at temperatures ranging from …
The Occurrence And Characterization Of Hemoglobin From Different Strains Of Genetically Diverse, Free-Living Frankia, Jason Beckwith
The Occurrence And Characterization Of Hemoglobin From Different Strains Of Genetically Diverse, Free-Living Frankia, Jason Beckwith
Electronic Theses and Dissertations
Hemoglobins have been identified in root nodules of many actinorhizal plants. When cultured in vitro, the actinomycete Frankia strain CcI3 produces hemoglobin when grown with or without supplied nitrogen. The cyanobacterium, Nostoc commune, also produces hemoglobin in vitro, although only under nitrogen-fixing, microaerobic conditions, and in less than one fifth of the explored strainslspecies. The objectives of this study were to determine if Frankia strains EANlpec, ArI3, EUNlf, CcI.17, and Cc13, members of diverse genogroups, are capable of producing hemoglobin in vitro, to characterize the oxygen kinetics of the hemoglobin, and to determine the effect of nitrogen, oxygen, and carbon …
Relationships Between Rooting Restrictions, Radial Growth, And Drought Stress With White Pine (Pinus Strobus) Decline In Southern Maine, Megan L. Fries
Relationships Between Rooting Restrictions, Radial Growth, And Drought Stress With White Pine (Pinus Strobus) Decline In Southern Maine, Megan L. Fries
Electronic Theses and Dissertations
Throughout southern Maine there was a noticeable decline and mortality of white pine (Pinus sfrobus) from 1997 through 2000 in dense pole-size stands. The decline was widespread, scattered, and happened simultaneously indicating that it was incited by an abiotic stress. Because only isolated stands showed decline and mortality, site factors likely predisposed trees to injury. Site factors are likely related to the widespread field abandonment that took place throughout southern and central Maine, and led to establishment of pure white pine stands in many areas. Although white pine can regenerate on many sites, some locations will have soil limitations, such …