The development and application of a diatom-based quantitative reconstruction technique in forensic science

Diatoms are a group of unicellular algae that have been recorded and classified for over 200 years and have been used in a range of applications in forensic science. We have developed a quantitative diatom-based reconstruction technique to confirm drowning as a cause of death and localize the site of drowning in two recent, high-profile, case studies. In both case studies we collected diatom samples from the local and/or regional area to act as a control in the examination of diatom assemblages associated with lungs and clothing. In Case Study 1 the modern analog technique suggested that all lung and clothing samples have statistically significant similarities to control samples from shallow water habitats. In Case Study 2, the analog matching suggested that the majority of lung samples show a statistically significant relationship to samples from a pond, indicating that this was the drowning medium.     

Analyzing the Use of Race and Ethnicity in Biomedical Research from a Local Community Perspective

Lost in the debate over the use of racial and ethnic categories in biomedical research is community-level analysis of how these categories function and influence health. Such analysis offers a powerful critique of national and transnational categories usually used in biomedical research such as "African-American" and "Native American." Ethnographic research on local African-American and Native American communities in Oklahoma shows the importance of community-level analysis. Local ("intra-community") health practices tend to be shared by members of an everyday interactional community without regard to racial or ethnic identity. Externally created ("extra-community") practices tend to be based on the existence of externally-imposed racial or ethnic identities, but African-American and Native American community members show similar patterns in their use of extra-community practices. Thus, membership in an interactional community seems more important than externally-imposed racial or ethnic identity in determining local health practices, while class may be as or more important in accounting for extra-community practices.