Dartmouth Digital Library Program

The role of TonB-dependent receptors and alternate sigma factors in the Bradyrhizobium japonicum/soybean symbiosis.
Rhizobium -- Genetics. Cell receptors. Transcription factors. Bacteria.
Bradyrhizobium japonicum forms a nitrogen-fixing symbiosis with soybean. Signaling events, such as production of flavonoids and Nod factor, initiate the interaction, leading to formation of specialized root organs called nodules. A B. japonicum...
Dartmouth Dissertations

Bottom-up effects of nutrient enrichment on plants, pollinators, and their interactions.
Meadow ecology -- Colorado. Angiosperms -- Nutrition. Angiosperms -- Pollination. Plants -- Effect of nitrogen on. Insect pollinators -- Ecology -- Colorado. Mountain plants -- Ecology -- Colorado. Bees -- Ecology -- Colorado. Bees -- Nutrition --...
Nutrients play fundamental roles in biological systems, affecting plant growth and quality, community structure, and species interactions. Although the effects of nutrients on primary and secondary production have been well documented, their...
Dartmouth Dissertations

The ecology of Vibrio cholerae: intra- and interspecific interactions.
Vibrio cholerae -- Ecology. Vibrio cholerae -- Growth. Cyanobacteria -- Ecology.
In this dissertation, I present an examination of the role of two biotic interactions in the population dynamics of Vibrio cholerae. Traits with a genetic basis such as size, physiological processes, stress tolerance, and even behavior, are key...
Dartmouth Dissertations

Reciprocal benefits in a plant-pollinator mutualism.
Mutualism (Biology). Insect-plant relationships. Insect population density. Bumblebees -- Ecology. Delphinium -- Ecology.
Mutualisms may facilitate coupled population expansion or decline if changes in either partner species lead to similar changes in the other species. However, few studies have measured how both species in a mutualism respond to changes in each...
Dartmouth Dissertations

Characterization of catalase in Arabidopsis thaliana.
Arabidopsis thaliana -- Genetics.
The Arabidopsis catalase gene family contains at least three genes, encoding subunits which combine in tetramers to form 7 detectable isozymes. Two of these genes are within 250 bp of each other at a single locus (CAT3/1) near the top of chromosome...
Dartmouth Dissertations

Molecular characterization of three ZIP metal transporters in Arabidopsis thaliana.
Arabidopsis thaliana -- Physiology. Zinc -- Physiological transport. Iron -- Physiological transport. Homeostasis. Trace elements in plant nutrition.
Iron and zinc are essential metal micronutrients that most humans acquire from plant-based diets. Unfortunately, plants are not a good source of these micronutrients, so billions of people worldwide suffer from deficiencies of these two elements....
Dartmouth Dissertations

Study of the molecular mechanism of the Neurospora circadian clock.
Neurospora -- Genetics. ; Neurospora -- Effect of light on. ; Circadian rhythms. ; Proteins -- Synthesis -- Effect of light on. ; Genetic regulation.
The frequency gene and the two proteins it encodes are central components of the Neurospora circadian clock. The frq message and proteins are involved in a negative feedback loop in which FRO represses its own transcript level. Based on this...
Dartmouth Dissertations

Iron acquisition and regulation in Bradyrhizobium japonicum.
Rhizobium -- Physiology. Rhizobium -- Genetics. Plants -- Effect of iron on.
Iron is essential in the agriculturally important symbiosis between Bradyrhizobium japonicum and soybean. Studying iron uptake in B. japonicum presents unique challenges in that the organism is found in two very different environments, free living...
Dartmouth Dissertations

Chemical processing of atmospheric inputs by subalpine balsam fir.
Balsam fir. ; Forest ecology. ; Air -- Pollution -- Environmental aspects. ; Plants -- Effect of air pollution on.
Dartmouth Dissertations

Cross-kingdom communication: The role of quorum sensing signals in Candida albicans and Pseudomonas aeruginosa interactions.
Pseudomonas aeruginosa -- Molecular genetics. Candida albicans. Pseudomonas aeruginosa infections. Plant-pathogen relationships. Cystic fibrosis -- Immunological aspects. Virulence (Microbiology) -- Molecular aspects. Medical Terms: Farnesol;...
The overall scope of my thesis project is to determine effects of farnesol, a secreted factor produced by C. albicans , on P. aeruginosa virulence. These two organisms are frequently found with one another in mixed infections and our lab has...
Dartmouth Dissertations

Structural characterization of the LysR-type virulence factor, AphB, and insight into its mehcanism of transcriptional activation at the tcpPH promoter in Vibrio cholerae
The LysR-type virulence regulator, AphB, initiates the Vibrio cholerae virulence cascade resulting in expression of the two critical virulence factors, toxin-coregulated pilus and cholera toxin, by activating transcription at the tcpPH promoter....
Dartmouth Dissertations

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