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Gardel, Emily Jeanette

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Gardel

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Emily Jeanette

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Gardel, Emily Jeanette
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    Microbe-electrode interactions: The chemico-physical environment and electron transfer
    (2013-10-14) Gardel, Emily Jeanette; Girguis, Peter R.; Aizenberg, Joanna; Hu, Evelyn
    This thesis presents studies that examine microbial extracellular electron transfer that an emphasis characterizing how environmental conditions influence electron flux between microbes and a solid-phase electron donor or acceptor. I used bioelectrochemical systems (BESs), fluorescence and electron microscopy, chemical measurements, 16S rRNA analysis, and qRT-PCR to study these relationships among chemical, physical and biological parameters and processes.
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    Electron Uptake by Iron-Oxidizing Phototrophic Bacteria
    (Nature Publishing Group, 2014) Bose, Arpita; Gardel, Emily Jeanette; Vidoudez, Charles; Parra, Erika; Girguis, Peter
    Oxidation–reduction reactions underlie energy generation in nearly all life forms. Although most organisms use soluble oxidants and reductants, some microbes can access solid-phase materials as electron-acceptors or -donors via extracellular electron transfer. Many studies have focused on the reduction of solid-phase oxidants. Far less is known about electron uptake via microbial extracellular electron transfer, and almost nothing is known about the associated mechanisms. Here we show that the iron-oxidizing photoautotroph Rhodopseudomonas palustris TIE-1 accepts electrons from a poised electrode, with carbon dioxide as the sole carbon source/electron acceptor. Both electron uptake and ruBisCo form I expression are stimulated by light. Electron uptake also occurs in the dark, uncoupled from photosynthesis. Notably, the pioABC operon, which encodes a protein system essential for photoautotrophic growth by ferrous iron oxidation, influences electron uptake. These data reveal a previously unknown metabolic versatility of photoferrotrophs to use extracellular electron transfer for electron uptake.
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    A Simple, Inexpensive Holographic Microscope
    (2010) Dimiduk, Thomas G.; Kosheleva, Ekaterina Alexeevna; Kaz, David; McGorty, Ryan; Gardel, Emily Jeanette; Manoharan, Vinothan
    We have built a simple holographic microscope completely out of consumer components. We obtain at least 2.8 micrometer resolution and depth of field greater than 200 micrometers from an instrument costing less than $1000.