Digital Commons Network^™

Identification And Molecular Mapping Of A Gene Restricting Nodulation In Soybean, Daqi Qian

Doctoral Dissertations

Successful establishment in soybean (Glycine max L. Merr.) nodules of Bradyrhizobium japonicum strains with improved nitrogen-fixing ability over indigenous strains has been suggested as an approach to enhance soybean productivity. A major obstacle to this achievement has been the superior competitive ability of indigenous strains over improved strains for developing nodules. The objectives of this study were to; (1) search for genes which restrict nodulation with certain strains of B. japonicum, (2) study the genetic pattern of restricted nodulation, (3) investigate at which stage nodulation development is blocked, and (4) use RFLP technology to map the gene restricting …

The Spatial Distribution Of Snow And Aerosol Chemistry In The Mountains Of Central Asia, Cameron Parker Wake

Doctoral Dissertations

Central Asia represents one of the largest voids with respect to our understanding of geochemical cycles in the continental troposphere and hydrosphere. Fortunately, the vast extent of glaciers in central Asia provide several high elevation ($>$5000 m) locations from which to recover glaciochemical records, and thereby furnish a unique window through which to study biogeochemical cycles in the mid- to upper-troposphere.

Snow and ice samples collected from nine glacier basins spread throughout the mountains of central Asia were analyzed for their major ion and particle content. Aerosol samples collected from four sites in central Asia were analyzed for their …