Search Results - "Romanek, Christopher S"

Magnesium isotope fractionation during precipitation of inorganic calcite under laboratory conditions by Li, Weiqiang, Chakraborty, Suvankar, Beard, Brian L., Romanek, Christopher S., Johnson, Clark M.

“…The Mg isotope composition of biogenic and inorganic carbonate bears on paleoclimate and paleooceanography studies because of the potential for constraining…”
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Magnetite as a prokaryotic biomarker: A review by Jimenez-Lopez, Concepcion, Romanek, Christopher S., Bazylinski, Dennis A.

“…Over the years, nanometer‐sized magnetite (Fe3O4) crystals have been recovered from many modern and ancient environments including sediments and soils and even…”
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Global Occurrence of Archaeal amoA Genes in Terrestrial Hot Springs by Zhang, Chuanlun L, Ye, Qi, Huang, Zhiyong, Li, WenJun, Chen, Jinquan, Song, Zhaoqi, Zhao, Weidong, Bagwell, Christopher, Inskeep, William P, Ross, Christian, Gao, Lei, Wiegel, Juergen, Romanek, Christopher S, Shock, Everett L, Hedlund, Brian P

“…Despite the ubiquity of ammonium in geothermal environments and the thermodynamic favorability of aerobic ammonia oxidation, thermophilic ammonia-oxidizing…”
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Quaternary interglacial environmental stability in San Salvador Island (Bahamas): A land snail isotopic approach by Yanes, Yurena, Romanek, Christopher S.

“…The 13C/12C and 18O/16O ratios of modern and fossil shells of two ecologically-distinct land snail taxa (Cerionidae and Annularidae) from San Salvador Island…”
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A computational study of Mg2+ dehydration in aqueous solution in the presence of HS− and other monovalent anions – Insights to dolomite formation by Yang, Yang, Sahai, Nita, Romanek, Christopher S., Chakraborty, Suvankar

“…Massive sedimentary dolomite formed at near-Earth’s surface temperatures is abundant in the ancient geological rock record compared to modern deposition…”
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Inorganic synthesis of Fe–Ca–Mg carbonates at low temperature by Romanek, Christopher S., Jiménez-López, Concepción, Navarro, Alejandro Rodriguez, Sánchez-Román, Monica, Sahai, Nita, Coleman, Max

“…A set of free-drift experiments was undertaken to synthesize carbonates of mixed cation content (Fe, Ca, Mg) from solution at 25 and 70 °C to better understand…”
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Oxygen and carbon stable isotopes of modern land snail shells as environmental indicators from a low-latitude oceanic island by Yanes, Yurena, Romanek, Christopher S., Delgado, Antonio, Brant, Heather A., Noakes, John E., Alonso, María R., Ibáñez, Miguel

“…Land snails provide a unique opportunity to study terrestrial paleoenvironments because their shells, which are generally highly abundant and well-preserved in…”
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Experimentally determined biomediated Sr partition coefficient for dolomite: Significance and implication for natural dolomite by Sánchez-Román, Mónica, McKenzie, Judith A., de Luca Rebello Wagener, Angela, Romanek, Christopher S., Sánchez-Navas, Antonio, Vasconcelos, Crisógono

“…Two strains of moderately halophilic bacteria were grown in aerobic culture experiments containing gel medium to determine the Sr partition coefficient between…”
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Bioaccumulation of trace elements in omnivorous amphibian larvae: Implications for amphibian health and contaminant transport by Unrine, Jason M., Hopkins, William A., Romanek, Christopher S., Jackson, Brian P.

“…Despite the influence that amphibians have on the flow of energy and nutrients in ecological systems, the role that amphibians play in transporting…”
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Shell layer variation in trace element concentration for the freshwater bivalve Elliptio complanata by Carroll, Monica, Romanek, Christopher S.

“…While the elemental chemistry of marine mollusk shells contains valuable environmental information, extending these interpretations to freshwater bivalve…”
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Spectral reflectance properties of ureilites by CLOUTIS, E. A., HUDON, Pierre, ROMANEK, Christopher S., BISHOP, Janice L., REDDY, Vishnu, GAFFEY, Michael J., HARDERSEN, Paul S.

“…– The 0.35–2.6 μm reflectance spectra of 18 ureilites have been examined in order to improve our understanding of the spectral reflectance properties of this…”
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Mercury Concentrations in Nestling Wading Birds Relative to Diet in the Southeastern United States: A Stable Isotope Analysis by Bryan, A. Lawrence, Brant, Heather A., Jagoe, Charles H., Romanek, Christopher S., Brisbin, I. Lehr

“…Mercury (Hg) is a ubiquitous environmental contaminant that is transferred trophically through aquatic and terrestrial food webs. To better understand the…”
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Search for Past Life on Mars: Possible Relic Biogenic Activity in Martian Meteorite ALH84001 by McKay, David S., Gibson, Everett K., Thomas-Keprta, Kathie L., Vali, Hojatollah, Romanek, Christopher S., Clemett, Simon J., Xavier D. F. Chillier, Maechling, Claude R., Zare, Richard N.

“…Fresh fracture surfaces of the martian meteorite ALH84001 contain abundant polycyclic aromatic hydrocarbons (PAHs). These fresh fracture surfaces also display…”
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Oxygen isotope fractionation in synthetic magnesian calcite by Jiménez-López, Concepción, Romanek, Christopher S, Huertas, F.Javier, Ohmoto, Hiroshi, Caballero, Emilia

“…Mg-bearing calcite was precipitated at 25°C in closed system free-drift experiments from solutions containing NaHCO 3, CaCl 2 and MgCl 2. The chemical and…”
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Gracilibacter thermotolerans gen. nov., sp. nov., an anaerobic, thermotolerant bacterium from a constructed wetland receiving acid sulfate water by Lee, Yong-Jin, Romanek, Christopher S, Mills, Gary L, Davis, Richard C, Whitman, William B, Wiegel, Juergen

“…1 Department of Microbiology, The University of Georgia, Athens, GA 30602, USA 2 Savannah River Ecology Laboratory, Aiken, SC 29802, USA 3 Department of…”
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Sub-centennial resolution amino acid geochronology for the freshwater mussel Lampsilis for the last 2000 years by Huntley, John Warren, Kaufman, Darrell S., Kowalewski, Michał, Romanek, Christopher S., Neves, Richard J.

“…We present an amino acid racemization-based age calibration with sub-centennial resolution from historical specimens of several species of the freshwater…”
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Thermosediminibacter oceani gen. nov., sp. nov. and Thermosediminibacter litoriperuensis sp. nov., new anaerobic thermophilic bacteria isolated from Peru Margin by Lee, Yong-Jin, Wagner, Isaac D, Brice, Mary E, Kevbrin, Vadim V, Mills, Gary L, Romanek, Christopher S, Wiegel, Juergen

“…A new group of anaerobic thermophilic bacteria was isolated from enrichment cultures obtained from deep sea sediments of Peru Margin collected during Leg 201…”
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Stable Isotope Signature of Philopatry and Dispersal in a Migratory Songbird by Graves, Gary R., Romanek, Christopher S., Navarro, Alejandro Rodriguez

“…Stable isotope analysis is widely promoted as a practical method for tracing the geographic origins of migratory birds. However, the extent to which geospatial…”
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Aerobic biomineralization of Mg-rich carbonates: Implications for natural environments by Sánchez-Román, Mónica, Romanek, Christopher S., Fernández-Remolar, David C., Sánchez-Navas, Antonio, McKenzie, Judith Ann, Pibernat, Ricardo Amils, Vasconcelos, Crisogono

“…We studied the formation of Mg-rich carbonate in culture experiments using different aerobic bacterial strains and aqueous Mg/Ca ratios (2 to 11.5) at Earth…”
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An “On-Line” Method for Oxygen Isotope Exchange Between Gas-Phase CO2 and Water by Levitt, Nicholas Paul, Romanek, Christopher S.

“…An “on-line” mixing system has been developed and evaluated for continuous oxygen isotope exchange between gas-phase CO 2 and liquid water. The system is…”
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