@article {3064,
	title = {Solvent-Induced Assembly of Microbial Protein Nanowires into Superstructured Bundles.},
	journal = {Biomacromolecules},
	volume = {22},
	year = {2021},
	month = {2021 Mar 08},
	pages = {1305-1311},
	abstract = {<p>Protein-based electronic biomaterials represent an attractive alternative to traditional metallic and semiconductor materials due to their environmentally benign production and purification. However, major challenges hindering further development of these materials include (1) limitations associated with processing proteins in organic solvents and (2) difficulties in forming higher-order structures or scaffolds with multilength scale control. This paper addresses both challenges, resulting in the formation of one-dimensional bundles composed of electrically conductive protein nanowires harvested from the microbes  and . Processing these bionanowires from common organic solvents, such as hexane, cyclohexane, and DMF, enabled the production of multilength scale structures composed of distinctly visible pili. Transmission electron microscopy revealed striking images of bundled protein nanowires up to 10 μm in length and with widths ranging from 50-500 nm (representing assembly of tens to hundreds of nanowires). Conductive atomic force microscopy confirmed the presence of an appreciable nanowire conductivity in their bundled state. These results greatly expand the possibilities for fabricating a diverse array of protein nanowire-based electronic device architectures.</p>},
	keywords = {Electric Conductivity, Electron Transport, Geobacter, Nanowires, Solvents},
	issn = {1526-4602},
	doi = {10.1021/acs.biomac.0c01790},
	author = {Sun, Yun-Lu and Montz, Brian J and Selhorst, Ryan and Tang, Hai-Yan and Zhu, Jiaxin and Nevin, Kelly P and Woodard, Trevor L and Ribbe, Alexander E and Russell, Thomas P and Nonnenmann, Stephen S and Lovley, Derek R and Emrick, Todd}
}
@article {3062,
	title = {Stainless steel corrosion via direct iron-to-microbe electron transfer by Geobacter species.},
	journal = {ISME J},
	volume = {15},
	year = {2021},
	month = {2021 Oct},
	pages = {3084-3093},
	abstract = {<p>Microbial corrosion of iron-based materials is a substantial economic problem. A mechanistic understanding is required to develop mitigation strategies, but previous mechanistic studies have been limited to investigations with relatively pure Fe(0), which is not a common structural material. We report here that the mechanism for microbial corrosion of stainless steel, the metal of choice for many actual applications, can be significantly different from that~for Fe(0). Although H is often an intermediary electron carrier between the metal and microbes during Fe(0) corrosion, we found that H is not abiotically produced from stainless steel, making this corrosion mechanism unlikely. Geobacter sulfurreducens and Geobacter metallireducens, electrotrophs that are known to directly accept electrons from other microbes or electrodes, extracted electrons from stainless steel via direct iron-to-microbe electron transfer. Genetic modification to prevent H consumption did not negatively impact on stainless steel corrosion. Corrosion was inhibited when genes for outer-surface cytochromes that are key electrical contacts were deleted. These results indicate that a common model of microbial Fe(0) corrosion~by hydrogenase-positive microbes, in which H serves as an intermediary electron carrier between the metal surface and the microbe, may not apply to the microbial corrosion of stainless steel. However, direct iron-to-microbe electron transfer is a~feasible route for stainless steel corrosion.</p>},
	keywords = {Corrosion, Electrons, Geobacter, Iron, Stainless Steel},
	issn = {1751-7370},
	doi = {10.1038/s41396-021-00990-2},
	author = {Tang, Hai-Yan and Yang, Chuntian and Ueki, Toshiyuki and Pittman, Conor C and Xu, Dake and Woodard, Trevor L and Holmes, Dawn E and Gu, Tingyue and Wang, Fuhui and Lovley, Derek R}
}
