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RISS 인기검색어
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- 저자 : Suryanarayanan, Sainath (검색결과 2 건)
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Be(e)coming experts: The controversy over insecticides in the honey bee colony collapse disorder
Suryanarayanan, Sainath,Kleinman, Daniel Lee SAGE Publications 2013 SOCIAL STUDIES OF SCIENCE Vol.43 No.2
<P>In this article, we explore the politics of expertise in an ongoing controversy in the United States over the role of certain insecticides in colony collapse disorder – a phenomenon involving mass die-offs of honey bees. Numerous long-time commercial beekeepers contend that newer systemic agricultural insecticides are a crucial part of the cocktail of factors responsible for colony collapse disorder. Many scientists actively researching colony collapse disorder reject the beekeepers’ claims, citing the lack of conclusive evidence from field experiments by academic and industry toxicologists. US Environmental Protection Agency regulators, in turn, privilege the latters’ approach to the issue, and use the lack of conclusive evidence of systemic insecticides’ role in colony collapse disorder to justify permitting these chemicals to remain on the market. Drawing on semistructured interviews with key players in the controversy, as well as published documents and ethnographic data, we show how a set of research norms and practices from agricultural entomology came to dominate the investigation of the links between pesticides and honey bee health, and how the epistemological dominance of these norms and practices served to marginalize the knowledge claims and policy positions of commercial beekeepers in the colony collapse disorder controversy. We conclude with a discussion of how the colony collapse disorder case can help us think about the nature and politics of expertise.</P>
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Magnetization Reversal and Chemical Pressure Effect in the Electron-doped Manganite CaMn0.95Sb0.05O3
Takahiro Fujiwara,Michiaki Matsukawa,Syuya Ohuchi,Satoru Kobayashi,Shigeki Nimori,Ramanathan Suryanarayanan 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.12
We have demonstrated the effect of Sr substitution on the temperature-dependent magnetizationreversal in the electron-doped manganite CaMn0.95Sb0.05O3. X-ray photoemission spectroscopyreveals the substitution of the Sb ion with its valence of 5+ at a Mn4+ site, resulting in oneeg-electron doping, which is consistent with the negative Seebeck coefficient previously reported. For the (Ca1−ySry)Mn0.95Sb0.05O3 system, anomalously-diamagnetic behaviors are observed fory ≤ 15% in the weak-field-cooled magnetization. For Sr contents beyond 15%, the behavior ofthe negative magnetization disappears. We believe that the local lattice distortion due to Sbsubstitution causes a tilting of the Jahn-Teller active Mn3+O6 octahedron and stabilizes the cantedspin state in a direction opposite that of applied field through the Dzyaloshinsky-Moriya interaction,thus contributing to the diamagnetic response.
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