https://cdr.lib.unc.edu/downloads/h989r543t

Alternative scales for measuring service quality: A comparative assessment based on psychometric and diagnostic criteria

In recent years, more attention has been given to the mechanism of disease induction caused by the surface properties of minerals. In this respect, specific research needs to be focused on the biologic interactions of oxygen radicals generated by mineral particles resulting in cell injury and DNA damage leading to fibrogenesis and carcinogenesis. In this investigation, we used electron spin resonance (ESR) and spin trapping to study oxygen radical generation from aqueous suspensions of freshly fractured crystalline silica. Hydroxyl radical (.OH), superoxide radical (O2.-) and singlet oxygen (1O2) were all detected. Superoxide dismutase (SOD) partially inhibited .OH yield, whereas catalase abolished .OH generation. H2O2 enhanced .OH generation while deferoxamine inhibited it, indicating that .OH is generated via a Haber-Weiss type reaction. These spin trapping measurements provide the first evidence that aqueous suspensions of silica particles generate O2.- and 1O2. Oxygen consumption measurements indicate that freshly fractured silica uses molecular oxygen to generate O2.- and 1O2. Electrophoretic assays of in vitro DNA strand breakages showed that freshly fractured silica induced DNA strand breakage, which was inhibited by catalase and enhanced by H2O2. In an argon atmosphere, DNA damage was suppressed, showing that molecular oxygen is required for the silica-induced DNA damage. Incubation of freshly fractured silica with linoleic acid generated linoleic acid-derived free radicals and caused dose-dependent lipid peroxidation as measured by ESR spin trapping and malondialdehyde formation. SOD, catalase, and sodium benzoate inhibited lipid peroxidation by 49, 52, and 75%, respectively, again showing the role of oxygen radicals in silica-induced lipid peroxidation.(ABSTRACT TRUNCATED AT 250 WORDS)

Silica radical-induced DNA damage and lipid peroxidation.

Over the last decades, a number of writers have exposed the complex ideology behind our construction of a largely imaginary Primitive Other upon whom we have projected either our fantasies of savagery and sexual license or an idealized vision of an unspoiled humanity.' Traditional treatments of Primitive Art have always been a part of this ambivalent discourse of the "primitive," and the best recent discussions of the concept of Primitive Art (Clifford, Price, Torgovnick) are acutely critical of it.2 But if recent writers have mercilessly at

Primitive Fakes, Tourist Art, and The Ideology of Authenticity

over the treatment of non-Western art and material culture in museums. I have chosen to bypass the steady flow of solid ethnographic studies of traditional arts and popular arts, and the emergence of new theoretical concerns in these studies for two reasons. 1 First, academic anthropologists rarely consider mu­ seum anthropology as an important area for the employment of anthropolo­ gists, and thus for the training of students. The situation for anthropologists in museums is rapidly changing and aspiring curators should be advised of the directions of change. Second, museum anthropologists

William Bolger

Papers

Act and Artifact