Learning in 140 characters : microblogging for professional learning

This thesis investigated how microblogging, a form of online social networking, was being employed by educators to support their professional learning. The study found that educators who participate in microblogging engage in a wide range of behaviours, with certain behaviours and activities commonly exhibited. An advantage of microblogging as a professional learning tool is its ability to link educators globally to exchange ideas from different perspectives and to share resources and teaching practices. Educators who microblog have access to relevant and timely learning that is not constrained by time or distance and can be tailored to meet their individual needs

A comparison of the electrophoretic properties of the ATP-sulfurylases, APS-reductases, and sulfite reductases from cultures of dissimilatory sulfate-reducing bacteria

ATP-sulfurylases, APS-reductases, and sulfite reductases (SO3−2 → S−2) have been detected by gel disc electrophoresis in 13 cultures of dissimilatory sulfate-reducing bacteria and their electrophoretic properties have been compared. With respect to these three enzymes only, the results were indicative of some interspecies and intergenus homologies. In the Desulfovibrio strains (except Desulfovibrio desulfuricans 8301 which does not contain desulfoviridin), the major sulfite reductase was electrophoretically coincident with desulfoviridin and, in the Desulfotomaculum strains, with a brown protein. Some distinct patterns of electrophoretically distinguishable forms of APS-reductase were found. Considerable electrophoretic variation was found among the ATP-sulfurylases. </jats:p

A Method for the Electrophoretic Characterization of Sulfite Reductases in Crude Preparations from Sulfate-Reducing Bacteria Using Polyacrylamide Gels

Sulfite reductases in crude extracts of sulfate-reducing bacteria were detected by a polyacrylamide gel disc electrophoretic technique in which the sites of sulfite reductase activity were identified by precipitating sulfide as black FeS. Black bands were coincident with brown bands in Desulfotomaculum nigrificans extracts and with green bands in Desulfovibrio gigas extracts. The results are discussed in relation to present knowledge on sulfite reduction in sulfate-reducing bacteria. </jats:p