http://hdl.handle.net/1957/32832 2013-05-21T14:58:56Z http://hdl.handle.net/1957/37942 Spatial Variability Mapping of pH in Oregon Organic Farms using Geographic Information Systems (GIS) Geospatial Interpolation Models Stewart, Julie A. This internship project (Dr. Dawn Wright—Department of Geoscience) was a synthesis of several aspects of the research process. The documentation of methods consisted of: primary data collection of soil samples, geographical coordinates, georeferencing, basemap creation, laboratory machine operation, laboratory methods, laboratory quality control planning, statistical analysis, and geo-statistical analysis using geospatial interpolation tools. Quantitative information must derive from measurement, and we cannot measure the soil everywhere; we can at best measure the soil with planned samples. So accurate information for any region is available only at isolated points or for small bodies of soil. Whatever we state for intermediate positions or larger blocks of land involves some kind of interpolation or estimation from the measurements. That in turn carries with it uncertainty, and so we want some measure of that uncertainty too. This research focus is more of a tutorial on how to think about measurement, interpolation, variability of pH and nutrients in soil while using this data in a GIS. 2013-04-01T00:00:00Z http://hdl.handle.net/1957/34351 Resistance to Schistosoma mansoni is correlated with the number of spreading granulocytes in Biomphalaria glabrata Callahan, Piera M.; Larson, Maureen K.; Bender, Randall C.; Bayne, Christopher J. Molluscan internal defenses rely heavily on circulating hemocytes. In most cases, encounters with large foreign bodies result in recognition by hemocytes followed by spreading of these defense cells over the object’s surface. The resulting encapsulation concentrates the force of the hemocytes’ assault on the foreign object. B. glabrata snail lines obtained by self-fertilization of isolated 13-16-R1 [Oregon] individuals have yielded multiple inbred families in which genes are fixed at ~88% of the loci. Among the phenotypic traits that we have measured in 20 of these families are susceptibilities of snails to the PR1 [Oregon] strain of Schistosoma mansoni, and hematocrits of quickly spreading granulocytes present in the hemolymph.  Higher numbers of these cells predict a snail phenotype that is resistant to S. mansoni infection. Both resistant and susceptible snails are found in families with intermediate hematocrits. We infer that within the parental 13-16-R1 population hemocyte numbers are varied. When sufficiently numerous, a snail’s hemocytes can generally prevent parasitic infection. At lower hematocrits, a more complex set of variables interact to determine the outcome of an infection. 2012-01-01T00:00:00Z http://hdl.handle.net/1957/32861 Beaver believer Morales, Monica; Stache, Stephanie; Vollmer, Lori 2012-08-23T00:00:00Z