Nadia Szeinbaum

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Soluble Mn(III) represents an important yet overlooked oxidant in marine and freshwater systems. The molecular mechanism of microbial Mn(III) reduction, however, has yet to be elucidated. Extracellular reduction of insoluble Mn(IV) and Fe(III) oxides by the metal-reducing γ-proteobacterium Shewanella oneidensis involves inner (CymA) and outer (OmcA)(More)
Background: Microbial manganese (Mn) cycling in marine and freshwater environments is generally assumed to consist of Mn oxidation in oxic water columns and Mn(IV) oxide reduction in anoxic sediments [1] as the only two bioavailable Mn redox species. This dogma was recently overturned with the discovery that soluble Mn dominates the soluble Mn pool at μM(More)
Soluble manganese in the intermediate +III oxidation state (Mn3+ ) is a newly identified oxidant in anoxic environments, whereas acetate is a naturally abundant substrate that fuels microbial activity. Microbial populations coupling anaerobic acetate oxidation to Mn3+ reduction, however, have yet to be identified. We isolated a Shewanella strain capable of(More)
Inquiry-based teaching approaches are increasingly being adopted in biology laboratories. Yet teaching assistants (TAs), often novice teachers, teach the majority of laboratory courses in US research universities. This study analyzed the perspectives of TAs and their students and used classroom observations to uncover challenges faced by TAs during their(More)
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