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Tetrachloroethene is a prominent groundwater pollutant that can be reductively dechlorinated by mixed anaerobic microbial populations to the nontoxic product ethene. Strain 195, a coccoid bacterium that dechlorinates tetrachloroethene to ethene, was isolated and characterized. Growth of strain 195 with H2 and tetrachloroethene as the electron donor and(More)
T he Internet has long been identified as an informa-ion agora (Branscomb, 1994). The role of Internet s a public space for every citizen (as opposed to purely for professionals, for example) is being shaped by two seemingly contradictory characteristics: Internet is both ubiquitous and personal. Cyberspace, unlike the traditional media types (broadcast,(More)
Methanosarcina barkeri 227 possesses two clusters of genes potentially encoding nitrogenases. We have previously demonstrated that one cluster, called nif2, is expressed under molybdenum (Mo)-sufficient conditions, and the deduced amino acid sequences for nitrogenase structural genes in that cluster most closely resemble those for the Mo nitrogenase of the(More)
About Pearson Everything we do at Pearson grows out of a clear mission: to help people make progress in their lives through personalized and connected learning solutions that are accessible, affordable, and that achieve results, focusing on college-and-career readiness, digital learning, educator effectiveness, and research for innovation and efficacy.(More)
Testlets are items bundled together based on related context such as a common stimulus, passage, theme, or scenario. The most important essentials of testlets in computerized adaptive testing (CAT) are content balancing, which secures the test validity, and administering items adaptive to the test taker's ability, which ensures the test reliability. For(More)