M
Madeline Vargas
Researcher at College of the Holy Cross
Publications - 15
Citations - 2013
Madeline Vargas is an academic researcher from College of the Holy Cross. The author has contributed to research in topics: Geobacter sulfurreducens & Thermotoga neapolitana. The author has an hindex of 11, co-authored 15 publications receiving 1822 citations. Previous affiliations of Madeline Vargas include University of Connecticut & University of Massachusetts Amherst.
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Journal ArticleDOI
Tunable metallic-like conductivity in microbial nanowire networks
Nikhil S. Malvankar,Madeline Vargas,Madeline Vargas,Kelly P. Nevin,Ashley E. Franks,Ching Leang,Byoung-Chan Kim,Byoung-Chan Kim,Kengo Inoue,Kengo Inoue,Tünde Mester,Tünde Mester,Sean F. Covalla,Sean F. Covalla,Jessica P Johnson,Jessica P Johnson,Vincent M. Rotello,Mark T. Tuominen,Derek R. Lovley +18 more
TL;DR: In this article, the authors showed that nanofilaments derived from natural amino acids can have metallic-like conductivity and showed that they can be used to construct a metallic conductivity network.
Journal ArticleDOI
Microbiological evidence for Fe(III) reduction on early Earth.
TL;DR: It is shown that Archaea and Bacteria that are most closely related to the last common ancestor can reduce Fe(III) to Fe(II) and conserve energy to support growth from this respiration and even Thermotoga maritima, previously considered to have only a fermentative metabolism, could grow as a respiratory organism when Fe( III) was provided as an electron acceptor.
Journal ArticleDOI
Aromatic Amino Acids Required for Pili Conductivity and Long-Range Extracellular Electron Transport in Geobacter sulfurreducens
Madeline Vargas,Madeline Vargas,Nikhil S. Malvankar,Pier-Luc Tremblay,Ching Leang,Jessica A. Smith,Pranav Patel,Oona Synoeyenbos-West,Kelly P. Nevin,Derek R. Lovley +9 more
TL;DR: The finding that a strain of G. sulfurreducens that produces pili with low conductivity is limited in these extracellular electron transport functions provides further insight into these environmentally significant processes.
Journal ArticleDOI
Structural Basis for Metallic-Like Conductivity in Microbial Nanowires
Nikhil S. Malvankar,Madeline Vargas,Madeline Vargas,Kelly P. Nevin,Pier-Luc Tremblay,Kenneth Evans-Lutterodt,Dmytro Nykypanchuk,Eric Martz,Mark T. Tuominen,Derek R. Lovley +9 more
TL;DR: The experimental results reported here further support the concept that the pili of G. sulfurreducens pilus represent a novel class of electronically functional proteins in which aromatic amino acids promote long-distance electron transport.
Journal ArticleDOI
A Geobacter sulfurreducens strain expressing pseudomonas aeruginosa type IV pili localizes OmcS on pili but is deficient in Fe(III) oxide reduction and current production.
Liu Xing,Pier-Luc Tremblay,Nikhil S. Malvankar,Kelly P. Nevin,Derek R. Lovley,Madeline Vargas,Madeline Vargas +6 more
TL;DR: It is demonstrated that the presence of OmcS on pili is not sufficient to confer conductivity to pili and suggested that there are unique structural features of the G. sulfurreducens PilA that are necessary for conductivity.