Index Catalog // ScholarsArchive@OSU

Quorum-sensing-controlled public goods in Pseudomonas aeruginosa : regulation and application

Creator:: Mellbye, Brett L.
Abstract:: Cell-to-cell communication by chemical signals, termed quorum sensing (QS), is a common regulatory scheme in the microbial world. Pseudomonas aeruginosa¸ an opportunistic pathogen of burn wounds and cystic fibrosis lungs, uses QS to control the expression of hundreds of genes, particularly those necessary for population level benefits such as biofilm...
Resource Type:: Dissertation
Full Text:: thank my committee members: Dr. Jeff Chang, Dr. Bruce Geller, Dr. Walt Ream, and Dr. Roger Ely, who

What is killing the corals? Viral and bacterial interrogations using metagenomics and microscopy

Creator:: Soffer, Nitzan
Abstract:: Corals have multiple roles in maintaining ocean health and are some of the world’s most diverse ecosystems. The coral animal is host to a multitude of taxa, including symbiotic dinoflagellate algae, fungi, bacteria, protists, and viruses. Environmental stressors and disease agents can perturb the delicate balance of the coral host...
Resource Type:: Dissertation
Full Text:: Weis, Steve Giovannoni, Roger Ely, Giri N. Deron Burkepile, Lauren Richardson, Josh Voss, and well

Hydrogen production via a sulfur-sulfur thermochemical water-splitting cycle

Creator:: AuYeung, Nicholas J.
Abstract:: Thermochemical water splitting cycles have been conceptualized and researched for over half a century, yet to this day none are commercially viable. The heavily studied Sulfur-Iodine cycle has been stalled in the early development stage due to a difficult HI-H₂O separation step and material compatibility issues. In an effort to...
Resource Type:: Dissertation
Full Text:: Chang, Richard Peterson, and Michael Lerner. Special thanks go to committee member Roger Ely for

Transcriptional and physiological response of Nitrosomonas europaea to inhibition by chlorinated aromatics and heavy metals

Creator:: Sandborgh, Sean C.
Abstract:: This research investigates the physiological and transcriptional responses of Nitrosomonas europaea when exposed to chlorinated aromatic compounds and heavy metals under varying environmental conditions. It was found that transcriptional responses of identified sentinel genes correlate well with nitrification inhibition. Sorption of metals to biomass was also investigated and found not...
Resource Type:: Dissertation
Full Text:: committee- Profs. Brian Wood, Peter Bottomley, Roger Ely, Ed Brook, and Stephen Lancaster for their time

Influence of processing parameters on diffusion of divalent nickel in wet silica sol-gel monoliths

Creator:: Dickson, David J.
Abstract:: The diffusion of divalent nickel (Ni²⁺) from wet silica gels was investigated. Silica gel is gaining interest as an encapsulation matrix for biological components. The transport of biologically relevant species within the gel is determined by the structural characteristics of the gel, which are in turn governed by synthesis parameters....
Resource Type:: Masters Thesis
Full Text:: thanks to my committee members, especially Professors Alex Yokochi and Roger Ely. First, for indulging

The influences of habitat structure and landscape heterogeneity on African buffalo (Syncerus caffer) group size in Hluhluwe-Imfolozi Game Reserve, South Africa

Creator:: Dora, Cathleen Anna
Abstract:: This study aimed to connect habitat and landscape scale variation, through time and space, to wildlife population dynamics. I studied African buffalo (Syncerus caffer) group size according to habitat structure, landscape heterogeneity, forage quality, and water availability in Hluhluwe-iMfolozi Game Reserve, South Africa. I used two approaches to study grouping...
Resource Type:: Masters Thesis

Enhancing hydrogen production in microbial electrolysis cells through development of platinum-free cathode and improvement of reactor design

Creator:: Hu, Hongqiang
Abstract:: Microbial electrolysis provides a new approach for hydrogen generation from renewable biomass. At current stage, the most likely limiting factors for successful scale up of this technology are the large internal resistance and high fabrication cost. This dissertation presents an attempt to overcome these limitations by investigating novel microbial electrolysis...
Resource Type:: Dissertation
Full Text:: thank the rest of my thesis committee: Dr. Roger Ely, Dr. Frank Chaplen, Dr. Mark Dolan, Dr. Sam Chan

Origins and evolution of plant microRNA genes

Creator:: Fahlgren, Noah
Abstract:: Eukaryotic small RNA (~20-30 nucleotides) are diverse regulatory molecules that repress gene expression at the transcriptional and post-transcriptional levels, defend hosts against invading viruses and defend genomes against selfish DNA elements. Small RNA populations are studied by high-throughput sequencing of the total small RNA fraction isolated from cells, however, the...
Resource Type:: Dissertation
Full Text:: stramenopiles and alveolates) and Excavata, but to date not Rhizaria (Axtell and Bowman, 2008; Roger and

Response of soil microbial communities to physical and chemical disturbances: implications for soil quality and land use sustainability

Creator:: Chaer, Guilherme M.
Abstract:: The objectives of this thesis were to evaluate the responses of soil microbial communities to physical and chemical disturbances, and associate these responses with soil functional stability and changes in soil quality. The first study consisted of application of heat shocks (HS) to soils with contrasting land use history to...
Resource Type:: Dissertation
Full Text:: : David Myrold, Maria Dragila, Roger Ely, and Anita Azarenko. Thanks to the CSS staff, in special to

Clostridium perfringens sporulation and gliding motility

Creator:: Huang, I-Hsiu
Abstract:: Clostridium perfringens type A isolates, an anaerobic enterotoxigenic spore forming bacterium, are the third leading cause of food-borne disease in the United States. Factors that contribute to the virulence of C. perfringens include the ability of the bacterium to form heat resistant spores and to produce an enterotoxin (CPE). Although...
Resource Type:: Dissertation
Full Text:: Rockey, and Dr. Roger Ely, who offered guidance and support. Thanks to Oregon State University and the

ScholarsArchive@OSU

Quorum-sensing-controlled public goods in Pseudomonas aeruginosa : regulation and application

What is killing the corals? Viral and bacterial interrogations using metagenomics and microscopy

Hydrogen production via a sulfur-sulfur thermochemical water-splitting cycle

Transcriptional and physiological response of Nitrosomonas europaea to inhibition by chlorinated aromatics and heavy metals

Influence of processing parameters on diffusion of divalent nickel in wet silica sol-gel monoliths

The influences of habitat structure and landscape heterogeneity on African buffalo (Syncerus caffer) group size in Hluhluwe-Imfolozi Game Reserve, South Africa

Enhancing hydrogen production in microbial electrolysis cells through development of platinum-free cathode and improvement of reactor design

Origins and evolution of plant microRNA genes

Response of soil microbial communities to physical and chemical disturbances: implications for soil quality and land use sustainability

Clostridium perfringens sporulation and gliding motility

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