Long-term batch experiments in an artificial groundwater medium indicated that microbial reduction of synthetic, high-surface-area goethite and lepidocrocite by Shewanella putrefaciens 200 can act to immobilize surface-associated zinc into a new mineral phase that is not soluble in 0.5 M HCl. While Zn was incorporated in siderite grains in experiments with goethite, additional Zn immobilization may result from incorporation into as yet unidentified biogenic minerals or into a more crystalline goethite. Experiments with an oxide mixture primarily composed of lepidocrocite resulted in the production of magnetite, biphasic im mobilization of Zn, and an enhanced overall degree of Zn immobilization. When NO3 - was present as an alternate electron acceptor, microbial production of Fe(II) was inhibited, and the degree of Zn immobilization was subsequently reduced. These data indicate that (i) biologically induced mineralization can play a key role in the cycling of trace elements in natural systems, (ii) the nature of the oxide surface plays an important role in biologically induced mineralization, and (iii) conditions associated with Fe(II) production are necessary for these processes to immobilize surface-bound Zn within these new mineral phases.

No abstract

Because governmental structures put in place to mitigate disaster risks and aid communities in the disaster recovery process have, at times, proven to be inadequate, reliance on other types of organizations is necessary for some communities to survive. Although there are a number of different actors that played a role in the reestablishment of communities within New Orleans since Hurricane Katrina took place, the Mary Queen of Vietnam (MQVN) Catholic Church is a prime example of how a community-based organization stepped in to address the needs of its community. This article examines how MQVN garnered social capital within its surrounding community to pursue successful community development in the absence of and opposition to governmental support and political resistance. This article will first review the government failure and decrease in civic trust that fostered a robust third-sector response in disaster recovery and redevelopment. Then, using social capital theory, the article supports the notion that civic distrust and confidence is derived from government and institutional performance, rather than increasing individualism or declining social trust. Finally, implications for federal disaster policy and third-sector disaster interventions are proposed.

It is perplexing why natural disasters, as important life-altering events, are seldom viewed as a catalyst for social change in the United States in general but particularly for African Americans. This article addresses a gap in literature by proposing natural disasters as a variable to help understand the African American experience. The authors argue that the first post-Civil War migration altered the life courses for many. Subsequent to the first migration wave (the Great Migration of 1916-1930), environmental factors altered many African American lives. Natural disasters such as The Great Mississippi River Flood of 1927, The 1948 Vanport Flood, and Hurricane Katrina illustrate the federal government’s indifference and neglect of responsibility, which played a role in decisions to migrate. These major natural environmental disasters, when situated in historical context as a part of the social, political, geographical, and economic landscape, are vital in the understanding of the African American experience.

No abstract