Thomas E. Hanson
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View article: Influence of carbon source and iron oxide minerals on methane production and magnetic mineral formation in salt marsh sediments
Influence of carbon source and iron oxide minerals on methane production and magnetic mineral formation in salt marsh sediments Open
Salt marshes can emit significant methane to the atmosphere. These emissions are highly variable, but the cause of this variability is not well understood. Although methanogenesis should be inhibited by sulfate reduction where sulfate is p…
View article: Tellurite and selenite processing by tellurite resistant marine microbes
Tellurite and selenite processing by tellurite resistant marine microbes Open
Understanding microbial transformations of the group VIa/16 metalloids tellurium and selenium is important for the remediation of contaminated environments and has been proposed as a green route for Se/Te nanoparticle synthesis. We previou…
View article: <i>Chlorobaculum tepidum</i> outer membrane vesicles may transport biogenic elemental sulfur
<i>Chlorobaculum tepidum</i> outer membrane vesicles may transport biogenic elemental sulfur Open
Outer membrane-derived vesicles (OMVs) have been studied in different phyla of gram-negative bacteria, most extensively in the Pseudomonadota, where they have been shown to participate in diverse biological and environmental processes. To …
View article: Influence of Carbon Source and Iron Oxide Minerals on Methane Production and Magnetic Mineral Formation in Salt Marsh Sediments
Influence of Carbon Source and Iron Oxide Minerals on Methane Production and Magnetic Mineral Formation in Salt Marsh Sediments Open
Salt marshes can emit significant methane to the atmosphere, but these emissions are highly variable and not well-predicted by sulfate concentrations. The cause of this variability is unclear, but one hypothesis is that rather than being o…
View article: <i>Chlorobaculum tepidum</i> Outer Membrane Vesicles May Transport Biogenic Elemental Sulfur
<i>Chlorobaculum tepidum</i> Outer Membrane Vesicles May Transport Biogenic Elemental Sulfur Open
Outer membrane-derived vesicles (OMVs) have been studied in different phyla of Gramnegative bacteria, most extensively in the Pseudomonadota, where they have been shown to participate in diverse biological and environmental processes. To d…
View article: Identification of Bacterial Taxa Present in a Concrete Pennsylvania Bridge
Identification of Bacterial Taxa Present in a Concrete Pennsylvania Bridge Open
Concrete contains low microbial biomass, but some bacteria can grow in this highly alkaline environment. We used silica-based DNA extraction and 16S rRNA sequence analysis to identify the bacteria in a corroded concrete bridge sample from …
View article: Superoxide Dismutase and Pseudocatalase Increase Tolerance to Hg(II) in Thermus thermophilus HB27 by Maintaining the Reduced Bacillithiol Pool
Superoxide Dismutase and Pseudocatalase Increase Tolerance to Hg(II) in Thermus thermophilus HB27 by Maintaining the Reduced Bacillithiol Pool Open
Thermus thermophilus is a deep-branching thermophilic aerobe. It is a member of the Deinococcus - Thermus phylum that, together with the Aquificae , constitute the earliest branching aerobic bacterial lineages; therefore, this organism ser…
View article: Insights Into the Mineralogy and Surface Chemistry of Extracellular Biogenic S0 Globules Produced by Chlorobaculum tepidum
Insights Into the Mineralogy and Surface Chemistry of Extracellular Biogenic S0 Globules Produced by Chlorobaculum tepidum Open
Elemental sulfur (S0) is produced and degraded by phylogenetically diverse groups of microorganisms. For Chlorobaculum tepidum, an anoxygenic phototroph, sulfide is oxidized to produce extracellular S0 globules, which can be further oxidiz…
View article: Physiological Studies of <i>Chlorobiaceae</i> Suggest that Bacillithiol Derivatives Are the Most Widespread Thiols in Bacteria
Physiological Studies of <i>Chlorobiaceae</i> Suggest that Bacillithiol Derivatives Are the Most Widespread Thiols in Bacteria Open
Low-molecular-weight thiols are key metabolites that participate in many basic cellular processes: central metabolism, detoxification, and oxidative stress resistance. Here we describe a new thiol, N-methyl-bacillithiol, found in an anaero…
View article: Addendum: Comparative Genomic Analysis of the Class Epsilonproteobacteria and Proposed Reclassification to Epsilonbacteraeota (phyl. nov.)
Addendum: Comparative Genomic Analysis of the Class Epsilonproteobacteria and Proposed Reclassification to Epsilonbacteraeota (phyl. nov.) Open
© The Author(s), 2018. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Frontiers in Microbiology 9 (2018): 772, doi:10.3389/fmicb.2018.00772.
View article: Differential RNA Sequencing Implicates Sulfide as the Master Regulator of S <sup>0</sup> Metabolism in Chlorobaculum tepidum and Other Green Sulfur Bacteria
Differential RNA Sequencing Implicates Sulfide as the Master Regulator of S <sup>0</sup> Metabolism in Chlorobaculum tepidum and Other Green Sulfur Bacteria Open
The green sulfur bacteria ( Chlorobiaceae ) are anaerobes that use electrons from reduced sulfur compounds (sulfide, S 0 , and thiosulfate) as electron donors for photoautotrophic growth. Chlorobaculum tepidum , the model system for the Ch…
View article: Low-Molecular-Weight Thiols and Thioredoxins Are Important Players in Hg(II) Resistance in Thermus thermophilus HB27
Low-Molecular-Weight Thiols and Thioredoxins Are Important Players in Hg(II) Resistance in Thermus thermophilus HB27 Open
Mercury (Hg), one of the most toxic and widely distributed heavy metals, has a high affinity for thiol groups. Thiol groups reduce and sequester Hg. Therefore, low-molecular-weight (LMW) and protein thiols may be important cell components …
View article: N-methyl-bacillithiol, a new metabolite discovered in the<i>Chlorobiaceae</i>, indicates that bacillithiol and derivatives are widely phylogenetically distributed
N-methyl-bacillithiol, a new metabolite discovered in the<i>Chlorobiaceae</i>, indicates that bacillithiol and derivatives are widely phylogenetically distributed Open
Low-molecular weight (LMW) thiols are metabolites that mediate redox homeostasis and the detoxification of chemical stressors in cells. LMW thiols are also thought to play a central role in sulfur oxidation pathways in phototrophic bacteri…
View article: dRNA-seq implicates sulfide as master regulator of S(0) metabolism in<i>Chlorobaculum tepidum</i>and other green sulfur bacteria
dRNA-seq implicates sulfide as master regulator of S(0) metabolism in<i>Chlorobaculum tepidum</i>and other green sulfur bacteria Open
The green sulfur bacteria ( Chlorobiaceae ) are anaerobes that use electrons from reduced sulfur compounds (sulfide, S(0), and thiosulfate) as electron donors for photoautotrophic growth. Chlorobaculum tepidum , the model system for the Ch…
View article: Peculiar citric acid cycle of hydrothermal vent chemolithoautotroph Hydrogenovibrio crunogenus, and insights into carbon metabolism by obligate autotrophs
Peculiar citric acid cycle of hydrothermal vent chemolithoautotroph Hydrogenovibrio crunogenus, and insights into carbon metabolism by obligate autotrophs Open
The genome sequence of the obligate chemolithoautotroph Hydrogenovibrio crunogenus paradoxically predicts a complete oxidative citric acid cycle (CAC). This prediction was tested by multiple approaches including whole cell carbon assimilat…
View article: Comparative Genomic Analysis of the Class Epsilonproteobacteria and Proposed Reclassification to Epsilonbacteraeota (phyl. nov.)
Comparative Genomic Analysis of the Class Epsilonproteobacteria and Proposed Reclassification to Epsilonbacteraeota (phyl. nov.) Open
[This corrects the article on p. 682 in vol. 8, PMID: 28484436.].
View article: Chlorobaculum tepidum Modulates Amino Acid Composition in Response to Energy Availability, as Revealed by a Systematic Exploration of the Energy Landscape of Phototrophic Sulfur Oxidation
Chlorobaculum tepidum Modulates Amino Acid Composition in Response to Energy Availability, as Revealed by a Systematic Exploration of the Energy Landscape of Phototrophic Sulfur Oxidation Open
Microbial sulfur metabolism, particularly the formation and consumption of insoluble elemental sulfur (S 0 ), is an important biogeochemical engine that has been harnessed for applications ranging from bioleaching and biomining to remediat…
View article: Diverse sulfur metabolisms from two subterranean sulfidic spring systems
Diverse sulfur metabolisms from two subterranean sulfidic spring systems Open
In sulfidic environments, microbes oxidize reduced sulfur compounds via several pathways. We used metagenomics to investigate sulfur metabolic pathways from microbial mat communities in two subterranean sulfidic streams in Lower Kane Cave,…
View article: Mechanisms of extracellular S0 globule production and degradation in Chlorobaculum tepidum via dynamic cell–globule interactions
Mechanisms of extracellular S0 globule production and degradation in Chlorobaculum tepidum via dynamic cell–globule interactions Open
The Chlorobiales are anoxygenic phototrophs that produce solid, extracellular elemental sulfur globules as an intermediate step in the oxidation of sulfide to sulfate. These organisms must export sulfur while preventing cell encrustation d…
View article: A sulfide:quinone oxidoreductase from<i>Chlorobaculum tepidum</i>displays unusual kinetic properties
A sulfide:quinone oxidoreductase from<i>Chlorobaculum tepidum</i>displays unusual kinetic properties Open
Sulfide:quinone oxidoreductase (SQR) is the primary sulfide-oxidizing enzyme found in all three domains of life. Of the six phylogenetically distinct types of SQR, four have representatives that have been biochemically characterized. The g…
View article: D1FHS, the Type Strain of the Ammonia-Oxidizing Bacterium Nitrosococcus wardiae spec. nov.: Enrichment, Isolation, Phylogenetic, and Growth Physiological Characterization
D1FHS, the Type Strain of the Ammonia-Oxidizing Bacterium Nitrosococcus wardiae spec. nov.: Enrichment, Isolation, Phylogenetic, and Growth Physiological Characterization Open
An ammonia-oxidizing bacterium, strain D1FHS, was enriched into pure culture from a sediment sample retrieved in Jiaozhou Bay, a hyper-eutrophic semi-closed water body hosting the metropolitan area of Qingdao, China. Based on initial 16S r…
View article: Bait Preference of Free-Ranging Feral Swine for Delivery of a Novel Toxicant
Bait Preference of Free-Ranging Feral Swine for Delivery of a Novel Toxicant Open
Invasive feral swine (Sus scrofa) cause extensive damage to agricultural and wildlife resources throughout the United States. Development of sodium nitrite as a new, orally delivered toxicant is underway to provide an additional tool to cu…
View article: Light-Dependent Sulfide Oxidation in the Anoxic Zone of the Chesapeake Bay Can Be Explained by Small Populations of Phototrophic Bacteria
Light-Dependent Sulfide Oxidation in the Anoxic Zone of the Chesapeake Bay Can Be Explained by Small Populations of Phototrophic Bacteria Open
Microbial sulfide oxidation in aquatic environments is an important ecosystem process, as sulfide is potently toxic to aerobic organisms. Sulfide oxidation in anoxic waters can prevent the efflux of sulfide to aerobic water masses, thus mi…
View article: The State of U. S. Foreign Policy: The Year Ahead (2015-03-04)
The State of U. S. Foreign Policy: The Year Ahead (2015-03-04) Open
The State of U.S. Foreign Policy: The Year Ahead presented by Thomas Hanson retired U. S. Foreign Service Officer and Alworth Diplomat in Residence
View article: Bait Preference of Free-Ranging Feral Swine for Delivery of a Novel Toxicant
Bait Preference of Free-Ranging Feral Swine for Delivery of a Novel Toxicant Open
Columns Site = location of camera Treatment = type of treatment at site Day = day of study TotalPhotos = number of images taken per day per site PigPhotos = number of images with feral swine per day per site AdultPigPhotos = number of imag…