Ronald S. Oremland | |
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| Born | October 23, 1946 |
| Died | September 16, 2021 |
| Citizenship | US |
| Alma mater | Rensselaer Polytechnic Institute, University of Miami |
| Scientific career | |
| Institutions | United States Geological Survey |
Ronald Oremland was an American microbiologist, astrobiologist, and emeritus senior scientist at the United States Geological Survey. He authored over 200 papers on the microbiology of extreme habitats.
Oremland was raised in Brooklyn, New York. [1] He received his B.S. in biology from Rensselaer Polytechnic Institute in 1968, where he was inspired by Hermann Ehrlich's geomicrobiology course to pursue a career in marine microbiology. [2] He served as an active duty officer on the USS Utina (ATF-163) in the U.S. Navy. [3] In 1976, he received a PhD from the University of Miami under the mentorship of Barrie F. Taylor, where he worked on methane cycling in tropical marine sediments. [4] He went on to a postdoc at the NASA Ames Research Center, where he worked with Melvin P. Silverman on sulfate-reducing bacteria. He died of acute leukemia on September 16, 2021, at the age of 74. [5] [6]
From 1977 to 2019, Oremland conducted research at the United States Geological Survey in Menlo Park on the microbial metabolism in extreme environments including Mono Lake. His research focused on the geomicrobiology of acetylene, [4] selenium, [7] and arsenic. [8]
Oremland was an elected fellow of the American Society for Microbiology, American Geophysical Union, International Society for Environmental Biogeochemistry, and the American Association for the Advancement of Science. He was the 2020 recipient of the American Society of Microbiology Award for Environmental Research. [2]
Arsenic is a chemical element with the symbol As and atomic number 33. Arsenic occurs in many minerals, usually in combination with sulfur and metals, but also as a pure elemental crystal. Arsenic is a metalloid. It has various allotropes, but only the gray form, which has a metallic appearance, is important to industry.
Astrobiology is a scientific field within the life and environmental sciences that studies the origins, early evolution, distribution, and future of life in the universe by investigating its deterministic conditions and contingent events. As a discipline, astrobiology is founded on the premise that life may exist beyond Earth.
Hypothetical types of biochemistry are forms of biochemistry agreed to be scientifically viable but not proven to exist at this time. The kinds of living organisms currently known on Earth all use carbon compounds for basic structural and metabolic functions, water as a solvent, and DNA or RNA to define and control their form. If life exists on other planets or moons it may be chemically similar, though it is also possible that there are organisms with quite different chemistries – for instance, involving other classes of carbon compounds, compounds of another element, or another solvent in place of water.
An extremophile is an organism that is able to live in extreme environments, i.e. environments with conditions approaching or expanding the limits of what known life can adapt to, such as extreme temperature, radiation, salinity, or pH level.
An endolith or endolithic is an organism that is able to acquire the necessary resources for growth in the inner part of a rock, mineral, coral, animal shells, or in the pores between mineral grains of a rock. Many are extremophiles, living in places long considered inhospitable to life. The distribution, biomass, and diversity of endolith microorganisms are determined by the physical and chemical properties of the rock substrate, including the mineral composition, permeability, the presence of organic compounds, the structure and distribution of pores, water retention capacity, and the pH. Normally, the endoliths colonize the areas within lithic substrates to withstand intense solar radiation, temperature fluctuations, wind, and desiccation. They are of particular interest to astrobiologists, who theorize that endolithic environments on Mars and other planets constitute potential refugia for extraterrestrial microbial communities.
Paul Charles William Davies is an English physicist, writer and broadcaster, a professor in Arizona State University and director of BEYOND: Center for Fundamental Concepts in Science. He is affiliated with the Institute for Quantum Studies in Chapman University in California. He previously held academic appointments in the University of Cambridge, University College London, University of Newcastle upon Tyne, University of Adelaide and Macquarie University. His research interests are in the fields of cosmology, quantum field theory, and astrobiology.
Halomonadaceae is a family of halophilic Pseudomonadota.
In enzymology, a selenate reductase (EC 1.97.1.9) is an enzyme that catalyzes the chemical reaction
Penelope J. Boston is a speleologist. She is associate director of the National Cave and Karst Research Institute in Carlsbad, New Mexico, and founder and director of the Cave and Karst Studies Program at New Mexico Institute of Mining and Technology in Socorro. Among her research interests are geomicrobiology of caves and mines, extraterrestrial speleogenesis, and space exploration and astrobiology generally.
Felisa Wolfe-Simon is an American microbial geobiologist and biogeochemist. In 2010, Wolfe-Simon led a team that discovered GFAJ-1, an extremophile bacterium that they claimed was capable of substituting arsenic for a small percentage of its phosphorus to sustain its growth, thus advancing the remarkable possibility of non-RNA/DNA-based genetics. However, these conclusions were immediately debated and criticized in correspondence to the original journal of publication, and have since come to be widely disbelieved. In 2012, two reports refuting the most significant aspects of the original results were published in the same journal in which the original findings had been previously published.
GFAJ-1 is a strain of rod-shaped bacteria in the family Halomonadaceae. It is an extremophile that was isolated from the hypersaline and alkaline Mono Lake in eastern California by geobiologist Felisa Wolfe-Simon, a NASA research fellow in residence at the US Geological Survey. In a 2010 Science journal publication, the authors claimed that the microbe, when starved of phosphorus, is capable of substituting arsenic for a small percentage of its phosphorus to sustain its growth. Immediately after publication, other microbiologists and biochemists expressed doubt about this claim, which was robustly criticized in the scientific community. Subsequent independent studies published in 2012 found no detectable arsenate in the DNA of GFAJ-1, refuted the claim, and demonstrated that GFAJ-1 is simply an arsenate-resistant, phosphate-dependent organism.
Richard Brice Hoover is a physicist who has authored 33 volumes and 250 papers on astrobiology, extremophiles, diatoms, solar physics, X-ray/EUV optics and meteorites. He holds 11 U.S. patents and was 1992 NASA Inventor of the Year. He was employed at the United States' NASA Marshall Space Flight Center from 1966 to 2012, where he worked on astrophysics and astrobiology. He established the Astrobiology Group there in 1997 and until his retirement in late 2011 he headed their astrobiology research. He conducted research on microbial extremophiles in the Antarctic, microfossils, and chemical biomarkers in precambrian rocks and in carbonaceous chondrite meteorites. Hoover has published claims to have discovered fossilized microorganisms in a collection of select meteorites on multiple occasions.
Dr. Mary A. Voytek is the director of the National Aeronautics and Space Administration (NASA) Astrobiology Program at NASA Headquarters in Washington, D.C. In 2015, Voytek formed Nexus for Exoplanet System Science (NExSS), a systems science initiative by NASA, to search for life on exoplanets. Voytek came to NASA from the U.S. Geological Survey in Reston, VA, where she headed the USGS Microbiology and Molecular Ecology Laboratory from 1998 to 2009.
Bacillus selenitireducens is a bacterium first isolated from Mono Lake, California. It is notable for respiring oxyanions of selenium and arsenic. It is spore-forming, rod-shaped and alkaliphile, its type strain being MLS10.
Bacillus arseniciselenatis is a bacterium first isolated from Mono Lake, California. It is notable for respiring oxyanions of selenium and arsenic. It is spore-forming, rod-shaped and alkaliphile, its type strain being E1H. It is a strict anaerobe.
Dawn Yvonne Sumner is an American geologist, planetary scientist, and astrobiologist. She is a professor at the University of California, Davis. Sumner's research includes evaluating microbial communities in Antarctic lakes, exploration of Mars via the Curiosity rover, and characterization of microbial communities in the lab and from ancient geologic samples. She is an investigator on the NASA Mars Science Laboratory (MSL) and was Chair of the UC Davis Department of Earth & Planetary Sciences from 2014-2016. She is Fellow of the Geological Society of America.
Jonathan Richard Lloyd is a professor of geomicrobiology and director of the Williamson Research Centre for Molecular Environmental Science, and is based in the Department of Earth and Environmental Sciences at the University of Manchester. His research is based at the interface between microbiology, geology and chemistry. His research focuses on the mechanisms of microbial metal-reduction, with emphasis on the environmental impact and biotechnological applications of metal-reducing bacteria. Some of the contaminants he studies include As, Tc, Sr, U, Np and Pu. Current activities are supported by funds from NERC, BBSRC, EPSRC, the EU and industry. Lloyd is also a senior visiting fellow at the National Nuclear Laboratory, which helps support the development of a nuclear geomicrobiology programme.
John A. Baross is an American marine microbiologist and professor of oceanography and astrobiology at the University of Washington who has made significant discoveries in the field of microbial ecology of hydrothermal vents and the physiology of thermophilic bacteria and archaea.
Geoffrey Michael Gadd is a British-Irish microbiologist and mycologist specializing in geomicrobiology, geomycology, and bioremediation. He is currently a professor at the University of Dundee, holding the Boyd Baxter Chair of Biology, and is head of the Geomicrobiology Group.
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