A
Alexander Johs
Researcher at Oak Ridge National Laboratory
Publications - 57
Citations - 2984
Alexander Johs is an academic researcher from Oak Ridge National Laboratory. The author has contributed to research in topics: Methylation & Chemistry. The author has an hindex of 19, co-authored 49 publications receiving 2338 citations. Previous affiliations of Alexander Johs include University of Tennessee & Austrian Academy of Sciences.
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Journal ArticleDOI
The Genetic Basis for Bacterial Mercury Methylation
Jerry M. Parks,Alexander Johs,Mircea Podar,Mircea Podar,Romain Bridou,Richard A. Hurt,Steven D. Smith,Stephen J. Tomanicek,Yun Qian,Steven D. Brown,Steven D. Brown,Craig C. Brandt,Anthony V. Palumbo,Jeremy C. Smith,Jeremy C. Smith,Judy D. Wall,Dwayne A. Elias,Dwayne A. Elias,Liyuan Liang +18 more
TL;DR: A two-gene cluster, hgcA and hgcB, required for mercury methylation by Desulfovibrio desulfuricans ND132 and Geobacter sulfurreducens PCA are reported, consistent with roles as a methyl carrier and an electron donor required for corrinoid cofactor reduction, respectively.
Journal ArticleDOI
Mercury methylation by novel microorganisms from new environments
Cynthia C. Gilmour,Mircea Podar,Allyson L. Bullock,Andrew M. Graham,Steven D. Brown,Anil C. Somenahally,Alexander Johs,Richard A. Hurt,Kathryn L. Bailey,Dwayne A. Elias +9 more
TL;DR: For the first time, Hg methylation is demonstrated in a number of species other than sulfate- (SRB) and iron- (FeRB) reducing bacteria, including methanogens, and syntrophic, acetogenic, and fermentative Firmicutes, which indicates organisms are much more phylogenetically and environmentally diverse than previously thought.
Journal ArticleDOI
Laying Waste to Mercury: Inexpensive Sorbents Made from Sulfur and Recycled Cooking Oils
Max J. H. Worthington,Renata L. Kucera,Inês S. Albuquerque,Christopher T. Gibson,Alexander Sibley,Ashley D. Slattery,Jonathan A. Campbell,Salah F. K. Alboaiji,Katherine A. Muller,Jason Young,Nick Adamson,Nick Adamson,Jason R. Gascooke,Deshetti Jampaiah,Ylias M. Sabri,Suresh K. Bhargava,Samuel J. Ippolito,David A. Lewis,Jamie S. Quinton,Amanda V. Ellis,Amanda V. Ellis,Alexander Johs,Gonçalo J. L. Bernardes,Gonçalo J. L. Bernardes,Justin M. Chalker +24 more
TL;DR: The research herein addresses this need by introducing low‐cost mercury sorbents made solely from sulfur and unsaturated cooking oils, synthesised entirely from waste and supplied on multi‐kilogram scales.
Journal ArticleDOI
Oxidation and methylation of dissolved elemental mercury by anaerobic bacteria
Haiyan Hu,Haiyan Hu,Hui Lin,Wang Zheng,Stephen J. Tomanicek,Alexander Johs,Xinbin Feng,Dwayne A. Elias,Liyuan Liang,Baohua Gu +9 more
TL;DR: Results from laboratory experiments suggest that the activity of methylating and non-methylating bacteria may together enhance the formation of methylmercury in anaerobic environments.
Journal ArticleDOI
Anaerobic Mercury Methylation and Demethylation by Geobacter bemidjiensis Bem.
Xia Lu,Xia Lu,Yu-Rong Liu,Alexander Johs,Linduo Zhao,Tieshan Wang,Ziming Yang,Hui Lin,Dwayne A. Elias,Eric M. Pierce,Liyuan Liang,Tamar Barkay,Baohua Gu +12 more
TL;DR: It is reported, for the first time, that the strain G. bemidjiensis Bem can mediate a suite of Hg transformations, including Hg(II) reduction, HG(0) oxidation, MeHg production and degradation under anoxic conditions.