Symbioses are a spectrum of interactions between organisms living in closeassociation. These intimate interactions range from mutualism, in which bothorganisms benefit, to parasitism, where one organism benefits at the expense ofthe other. Horizontal gene transfer is the acquisition of genes independent ofvertical transmission and demonstrably promotes the transition of bacteria...
Vertisols and other vertic-intergrade soils are found all over the globe, including many agricultural and urban areas. These soils are characterized by their cyclical shrinking and swelling behaviors, where bulk density and porosity distribution both vary as functions of time and/or soil moisture. In turn, alterations in physical soil parameters...
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2.4 Wetting front potential isolines (in cm) for initially dry soils as a
function of van
Nanotechnologies continue to permeate a multitude of industries, with diverse applications ranging from pesticides to fuel additives. The unusual behavior of nanomaterials that drives their innovation also complicates the job of toxicologists tasked with assessing their potential environmental and public health impacts. This dissertation investigates the underlying reasons for uncertainty...
Members of Gram-positive Actinobacteria cause economically important diseases to plants. Within the Rhodococcus genus,
some members can cause growth deformities and persist as pathogens on a wide range of host plants. The current model
predicts that phytopathogenic isolates require a cluster of three loci present on a linear plasmid, with...
The forest sector forms an important part of Oregon’s economy, especially in rural communities. However, the economic performance and development of the sector are subject to both significant natural disturbances and to new and existing policies. The most common and disastrous natural disturbances in Oregon are wildfires. The Biscuit Fire...
Introduction: Research has demonstrated that minimal shoes may help prevent ankle injuries by mimicking natural barefoot running. It has been proven that minimal shoes may help adults prevent injuries in the correct conditions, but little is known about the effect of minimal and barefoot running on youth kinematics. Purpose: To...
Phytophthora cinnamomi is a soilborne pathogen that causes root rot disease of highbush blueberry (Vaccinium corymbosum L.). When new installations of susceptible blueberry cultivars are infected with P. cinnamomi, plants often fail to grow significant new tissue, greatly reducing yields over the life of the planting. Chemical fungicides are available...
The Tualatin River in northwest Oregon has been designated as water quality limited by the Oregon Department of Environmental Quality. Restoration and enhancement of riparian areas to improve water quality is one task to be pursued by management agencies. This paper examines some of the potential costs and benefits of...
A quarter of all species around the globe are threatened with extinction; this article reviews research in economics on how best to counter those threats. Normative research has developed useful tools for cost-effectively choosing areas of habitat to protect. Such work has also designed working-lands contracts that can induce efficient...