| occupational risk factors for brain cancer: a population-based case-control study in iowa. | a number of occupations and industries have been inconsistently associated with the risk of brain cancer. to further explore possible relationships, we conducted a population-based case-control study of brain glioma in the state of iowa, involving 375 histologically confirmed incident cases and 2434 population-based controls. among men, the industries and/or occupations that had a significantly increased risk for employment of more than 10 years included roofing, siding, and sheet metalworking; ... | 2001 | 11322092 |
| characteristics of the rhizobia associated with dalea spp. in the ordway, kellogg-weaver dunes, and hayden prairies. | habitat fragmentation affects the biodiversity and function of aboveground organisms in natural ecosystems but has not been studied for effects on belowground species. in this paper, we consider the diversity of the rhizobia associated with the indigenous legume dalea purpurea in 3 residual prairie areas in minnesota and iowa. using dalea purpurea as a trap host, 218 rhizobia were recovered from these soils then characterized using boxa1r pcr. three major and 13 minor groups were distinguished b ... | 2005 | 15782230 |