Sessions, Alex

Article from CaltechAUTHORS

• Csernica, Timothy A. and Eiler, John M., el al. (2026) Multi-isotope characterization of 4,4'-DDT isolated from sediment samples via Orbitrap-IRMS; Marine Pollution Bulletin; Vol. 225; 119185; 10.1016/j.marpolbul.2025.119185
• Schimmelmann, Arndt and Sessions, Alex L., el al. (2026) Radiolytic CH₄ and CO₂ from irradiated organic compounds; International Journal of Earth Sciences; Vol. 115; No. 2; 17; 10.1007/s00531-026-02568-9
• Dion-Kirschner, Hannah and Kong-Johnson, Celia, el al. (2026) Position-Specific Carbon Isotope Analysis of Glucose at Natural Isotope Abundance by Electrospray-Ionization Orbitrap Mass Spectrometry; Analytical Chemistry; Vol. 98; No. 1; 915-926; 10.1021/acs.analchem.5c06166
• Mueller, Elliott P. and Heuer, Verena B., el al. (2025) Metabolic controls on the carbon isotope fractionations of bacterial fermentation; Proceedings of the National Academy of Sciences; Vol. 122; No. 41; e2511040122; 10.1073/pnas.2511040122
• Carrier, Brandi L. and Sefton-Nash, Elliot, el al. (2025) Mars Sample Return Sample Receiving Project Measurement Definition Team Final Report; Astrobiology; 15311074251382248; 10.1177/15311074251382248
• Sessions, Alex L. and Magnabosco, Cara, el al. (2025) Planning Considerations Related to Contamination Control for the Return and Analysis of Martian Samples; Astrobiology; Vol. 25; No. 10; 694-724; 10.1177/15311074251382157
• Schaible, George A. and Cliff, John B., el al. (2025) Comparing Raman and NanoSIMS for heavy water labeling of single cells; Microbiology Spectrum; Vol. 13; No. 7; e01659-24; PMCID PMC12211084; 10.1128/spectrum.01659-24
• Wang, Yao-Ping and Song, Zhiguang, el al. (2025) Dry season dominance of salinity's impact on hydrogen isotope fractionation in Aegiceras corniculatum mangrove lipids; Geochimica et Cosmochimica Acta; Vol. 394; 337-356; 10.1016/j.gca.2025.02.024
• He, Juan and Sessions, Alex L., el al. (2025) Sea surface water isotope changes recorded by alkenone δ²H from the northern South China Sea over the last 260 kyrs; Global and Planetary Change; Vol. 246; 104703; 10.1016/j.gloplacha.2025.104703
• Xie, Hao and Formolo, Michael J., el al. (2024) Theoretical and experimental constraints on hydrogen isotope equilibrium in C1-C5 alkanes; Geochimica et Cosmochimica Acta; Vol. 386; 63-73; 10.1016/j.gca.2024.08.023
• Chimiak, L. and Hara, E., el al. (2024) Glycine synthesis from nitrate and glyoxylate mediated by ferroan brucite: An integrated pathway for prebiotic amine synthesis; Proceedings of the National Academy of Sciences; Vol. 121; No. 45; e2408248121; 10.1073/pnas.2408248121
• Mueller, Elliott P. and Panehal, Juliann, el al. (2024) Isotopic evidence of acetate turnover in Precambrian continental fracture fluids; Nature Communications; Vol. 15; No. 1; 9130; 10.1038/s41467-024-53438-4
• Silverman, Shaelyn N. and Wijker, Reto S., el al. (2024) Biosynthetic and catabolic pathways control amino acid δ²H values in aerobic heterotrophs; Frontiers in Microbiology; Vol. 15; 1338486; PMCID PMC11026604; 10.3389/fmicb.2024.1338486
• Crémière, Antoine and Tino, Christopher J., el al. (2024) A volatile sulfur sink aids in reconciling the sulfur isotope mass balance of closed basin lakes; Geochimica et Cosmochimica Acta; Vol. 369; 196-212; 10.1016/j.gca.2024.01.008
• Csernica, Timothy and Sessions, Alex L., el al. (2023) High-dimensional isotomics, part 2: Observations of over 100 constraints on methionine's isotome; Chemical Geology; Vol. 642; 121771; 10.1016/j.chemgeo.2023.121771
• Weiss, Gabriella M. and Sessions, Alex L., el al. (2023) Analysis of intramolecular carbon isotope distributions in alanine by electrospray ionization Orbitrap mass spectrometry; International Journal of Mass Spectrometry; Vol. 493; 117128; 10.1016/j.ijms.2023.117128
• Zeichner, Sarah S. and Chimiak, Laura, el al. (2023) Position-specific carbon isotopes of Murchison amino acids elucidate extraterrestrial abiotic organic synthesis networks; Geochimica et Cosmochimica Acta; Vol. 355; 210-221; 10.1016/j.gca.2023.06.010
• Wang, Xingchen Tony and Wang, Yuwei, el al. (2022) Oceanic nutrient rise and the late Miocene inception of Pacific oxygen-deficient zones; Proceedings of the National Academy of Sciences; Vol. 119; No. 45; e2204986119; PMCID PMC9659387; 10.1073/pnas.2204986119
• Mueller, Elliott P. and Wu, Fenfang, el al. (2022) Quantifying Isotopologue Reaction Networks (QIRN): A modelling tool for predicting stable isotope fractionations in complex networks; Chemical Geology; Vol. 610; Art. No. 121098; 10.1016/j.chemgeo.2022.121098
• Phillips, Alexandra A. and White, Margot E., el al. (2022) Novel sulfur isotope analyses constrain sulfurized porewater fluxes as a minor component of marine dissolved organic matter; Proceedings of the National Academy of Sciences of the United States of America; Vol. 119; No. 41; e2209152119; PMCID PMC9565371; 10.1073/pnas.2209152119
• Wilkes, Elise B. and Sessions, Alex L., el al. (2022) Position-specific carbon isotope analysis of serine by gas chromatography/Orbitrap mass spectrometry, and an application to plant metabolism; Rapid Communications in Mass Spectrometry; Vol. 36; No. 18; Art. No. e9347; 10.1002/rcm.9347
• Aronson, Heidi S. and Monteverde, Danielle R., el al. (2022) Sulfur cycling at natural hydrocarbon and sulfur seeps in Santa Paula Creek, CA; Geobiology; Vol. 20; No. 5; 707-725; 10.1111/gbi.12512
• Zeichner, Sarah S. and Wilkes, Elise B., el al. (2022) Methods and limitations of stable isotope measurements via direct elution of chromatographic peaks using gas chromotography-Orbitrap mass spectrometry; International Journal of Mass Spectrometry; Vol. 477; Art. No. 116848; 10.1016/j.ijms.2022.116848
• Chimiak, L. and Eiler, J., el al. (2022) Isotope effects at the origin of life: Fingerprints of the Strecker synthesis; Geochimica et Cosmochimica Acta; Vol. 321; 78-98; 10.1016/j.gca.2022.01.015
• Silverman, Shaelyn N. and Phillips, Alexandra A., el al. (2022) Practical considerations for amino acid isotope analysis; Organic Geochemistry; Vol. 164; Art. No. 104345; 10.1016/j.orggeochem.2021.104345
• Mueller, Elliott P. and Sessions, Alex L., el al. (2022) Simultaneous, High-Precision Measurements of δ²H and δ¹³C in Nanomole Quantities of Acetate Using Electrospray Ionization-Quadrupole-Orbitrap Mass Spectrometry; Analytical Chemistry; Vol. 94; No. 2; 1092-1100; 10.1021/acs.analchem.1c04141
• McNeill, V. Faye and Corsi, Richard, el al. (2022) Room-level ventilation in schools and universities; Atmospheric Environment: X; Vol. 13; Art. No. 100152; PMCID PMC8789458; 10.1016/j.aeaoa.2022.100152
• Lloyd, M. K. and Trembath-Reichert, E., el al. (2021) Methoxyl stable isotopic constraints on the origins and limits of coal-bed methane; Science; Vol. 374; No. 6569; 894-897; 10.1126/science.abg0241
• Osorio‐Rodriguez, Daniela and Razo-Mejia, Manuel, el al. (2021) Sulfur isotope fractionations constrain the biological cycling of dimethylsulfoniopropionate in the upper ocean; Limnology and Oceanography; Vol. 66; No. 10; 3607-3618; 10.1002/lno.11901
• Rees, Andrew B. H. and Holt, Katherine A., el al. (2021) Duelling narratives of chironomids and pollen explain climate enigmas during The Last Glacial-Interglacial transition in North Island New Zealand; Quaternary Science Reviews; Vol. 263; Art. No. 106997; 10.1016/j.quascirev.2021.106997
• Phillips, Alexandra A. and Speth, Daan R., el al. (2021) Microbial succession and dynamics in meromictic Mono Lake, California; Geobiology; Vol. 19; No. 4; 376-393; 10.1111/gbi.12437
• Dong, Guannan and Xie, Hao, el al. (2021) Clumped isotope effects of thermogenic methane formation: Insights from pyrolysis of hydrocarbons; Geochimica et Cosmochimica Acta; Vol. 303; 159-183; 10.1016/j.gca.2021.03.009
• Phillips, Alexandra A. and Wu, Fenfang, el al. (2021) Sulfur isotope analysis of cysteine and methionine via preparatory liquid chromatography and elemental analyzer isotope ratio mass spectrometry; Rapid Communications in Mass Spectrometry; Vol. 35; No. 4; Art. No. e9007; 10.1002/rcm.9007
• Chimiak, L. and Elsila, J. E., el al. (2021) Carbon isotope evidence for the substrates and mechanisms of prebiotic synthesis in the early solar system; Geochimica et Cosmochimica Acta; Vol. 292; 188-202; 10.1016/j.gca.2020.09.026
• Xie, Hao and Ponton, Camilo, el al. (2020) Position-specific distribution of hydrogen isotopes in natural propane: Effects of thermal cracking, equilibration and biodegradation; Geochimica et Cosmochimica Acta; Vol. 290; 235-256; 10.1016/j.gca.2020.09.009
• Paris, Guillaume and Fischer, Woodward W., el al. (2020) Deposition of sulfate aerosols with positive Δ³³S in the Neoarchean; Geochimica et Cosmochimica Acta; Vol. 285; 1-20; 10.1016/j.gca.2020.06.028
• Douglas, Peter M. J. and Moguel, Regina Gonzalez, el al. (2020) Clumped Isotopes Link Older Carbon Substrates With Slower Rates of Methanogenesis in Northern Lakes; Geophysical Research Letters; Vol. 47; No. 6; Art. No. e2019GL086756; 10.1029/2019gl086756
• Naragon, T. H. and Brückner, A. K., el al. (2020) Cuticular hydrocarbons and the integration of myrmecophile rove beetles into ant colonies; Integrative and Comparative Biology; Vol. 60; No. S1; E170; 10.1093/icb/icaa006
• Neubauer, Cajetan and Crémière, Antoine, el al. (2020) Stable Isotope Analysis of Intact Oxyanions Using Electrospray Quadrupole-Orbitrap Mass Spectrometry; Analytical Chemistry; Vol. 92; No. 4; 3077-3085; 10.1021/acs.analchem.9b04486
• Hinojosa, Jessica L. and Moy, Christopher M., el al. (2019) Hydrologic change in New Zealand during the last deglaciation linked to reorganization of the Southern Hemisphere westerly winds; Paleoceanography and Paleoclimatology; Vol. 34; No. 12; 2158-2170; 10.1029/2019pa003656
• Wijker, Reto S. and Sessions, Alex L., el al. (2019) ²H/¹H variation in microbial lipids is controlled by NADPH metabolism; Proceedings of the National Academy of Sciences of the United States of America; Vol. 116; No. 25; 12173-12182; PMCID PMC6589753; 10.1073/pnas.1818372116
• Sim, Min Sub and Sessions, Alex L., el al. (2019) Precise determination of equilibrium sulfur isotope effects during volatilization and deprotonation of dissolved H_2S; Geochimica et Cosmochimica Acta; Vol. 248; 242-251; 10.1016/j.gca.2019.01.016
• Sim, Min Sub and Ogata, Hideaki, el al. (2019) Role of APS reductase in biogeochemical sulfur isotope fractionation; Nature Communications; Vol. 10; Art. No. 44; PMCID PMC6327049; 10.1038/s41467-018-07878-4
• Neubauer, Cajetan and Sessions, Alex L., el al. (2018) Towards measuring growth rates of pathogens during infections by D_2O-labeling lipidomics; Rapid Communications in Mass Spectrometry; Vol. 32; No. 24; 2129-2140; 10.1002/rcm.8288
• Neubauer, Cajetan and Kasi, Ajay S., el al. (2018) Refining the Application of Microbial Lipids as Tracers of Staphylococcus aureus Growth Rates in Cystic Fibrosis Sputum; Journal of Bacteriology; Vol. 200; No. 24; Art. No. e00365-18; PMCID PMC6256016; 10.1128/jb.00365-18
• Xie, Hao and Ponton, Camilo, el al. (2018) Position-Specific Hydrogen Isotope Equilibrium in Propane; Geochimica et Cosmochimica Acta; Vol. 238; 193-207; 10.1016/j.gca.2018.06.025
• Rennie, Victoria C. F. and Paris, Guillaume, el al. (2018) Cenozoic record of δ^(34)S in foraminiferal calcite implies an early Eocene shift to deep-ocean sulfide burial; Nature Geoscience; Vol. 11; No. 10; 761-765; 10.1038/s41561-018-0200-y
• Piasecki, Alison and Sessions, Alex, el al. (2018) Position-specific ^(13)C distributions within propane from experiments and natural gas samples; Geochimica et Cosmochimica Acta; Vol. 220; 110-124; 10.1016/j.gca.2017.09.042
• Douglas, Peter M. J. and Stolper, Daniel A., el al. (2017) Methane Clumped Isotopes: Progress and Potential for a New Isotopic Tracer; Organic Geochemistry; Vol. 113; 262-282; 10.1016/j.orggeochem.2017.07.016
• Lee, Hyejung and Feakins, Sarah J., el al. (2017) Comparison of three methods for the methylation of aliphatic and aromatic compounds; Rapid Communications in Mass Spectrometry; Vol. 31; No. 19; 1633-1640; 10.1002/rcm.7947
• Campbell, Brian J. and Sessions, Alex L., el al. (2017) Minimal Influence of [NiFe] Hydrogenase on Hydrogen Isotope Fractionation in H₂-Oxidizing Cupriavidus necator; Frontiers in Microbiology; Vol. 8; Art. No. 1886; PMCID PMC5649130; 10.3389/fmicb.2017.01886
• Sim, Min Sub and Paris, Guillaume, el al. (2017) Quantification and isotopic analysis of intracellular sulfur metabolites in the dissimilatory sulfate reduction pathway; Geochimica et Cosmochimica Acta; Vol. 206; 57-72; 10.1016/j.gca.2017.02.024
• Podlaha, Olaf G. and Sessions, Alex L., el al. (2017) John M. Hayes 1940-2017. Father of isotopes in modern and ancient biogeochemical processes, biosynthetic carbon and hydrogen isotope fractionation and compound specific isotope analytical techniques; Organic Geochemistry; Vol. 108; 113-116; 10.1016/j.orggeochem.2017.04.002
• Smith, Derek A. and Sessions, Alex L., el al. (2017) Rapid Quantification and Isotopic Analysis of Dissolved Sulfur Species; Rapid Communications in Mass Spectrometry; Vol. 31; No. 9; 791-803; 10.1002/rcm.7846
• Stolper, D. A. and Love, G. D., el al. (2017) Paleoecology and paleoceanography of the Athel silicilyte, Ediacaran-Cambrian boundary, Sultanate of Oman; Geobiology; Vol. 15; No. 3; 401-426; 10.1111/gbi.12236
• Piasecki, Alison and Sessions, Alex, el al. (2016) Prediction of equilibrium distributions of isotopologues for methane, ethane and propane using density functional theory; Geochimica et Cosmochimica Acta; Vol. 190; 1-12; 10.1016/j.gca.2016.06.003
• Raven, Morgan Reed and Sessions, Alex L., el al. (2016) Rapid Organic Matter Sulfurization in Sinking Particles from the Cariaco Basin Water Column; Geochimica et Cosmochimica Acta; Vol. 190; 175-190; 10.1016/j.gca.2016.06.030
• Wirth, Stefanie B. and Sessions, Alex L. (2016) Plant-wax D/H ratios in the southern European Alps record multiple aspects of climate variability; Quaternary Science Reviews; Vol. 148; 176-191; 10.1016/j.quascirev.2016.07.020
• Piasecki, Alison and Sessions, Alex, el al. (2016) Analysis of the site-specific carbon isotope composition of propane by gas source isotope ratio mass spectrometer; Geochimica et Cosmochimica Acta; Vol. 188; 58-72; 10.1016/j.gca.2016.04.048
• Douglas, P. M. J. and Stolper, D. A., el al. (2016) Diverse origins of Arctic and Subarctic methane point source emissions identified with multiply-substituted isotopologues; Geochimica et Cosmochimica Acta; Vol. 188; 163-188; 10.1016/j.gca.2016.05.031
• Meshoulam, Alexander and Ellis, Geoffrey S., el al. (2016) Study of thermochemical sulfate reduction mechanism using compound specific sulfur isotope analysis; Geochimica et Cosmochimica Acta; Vol. 188; 73-92; 10.1016/j.gca.2016.05.026
• Osburn, Magdalena R. and Dawson, Katherine S., el al. (2016) Fractionation of Hydrogen Isotopes by Sulfate- and Nitrate-Reducing Bacteria; Frontiers in Microbiology; Vol. 7; Art. No. 1166; PMCID PMC4969296; 10.3389/fmicb.2016.01166
• Raven, Morgan Reed and Sessions, Alex L., el al. (2016) Sedimentary pyrite δ^(34)S differs from porewater sulfide in Santa Barbara Basin: proposed role of organic sulfur; Geochimica et Cosmochimica Acta; Vol. 186; 120-134; 10.1016/j.gca.2016.04.037
• Niedermeyer, Eva M. and Forrest, Matthew, el al. (2016) The stable hydrogen isotopic composition of sedimentary plant waxes as quantitative proxy for rainfall in the West African Sahel; Geochimica et Cosmochimica Acta; Vol. 184; 55-70; 10.1016/j.gca.2016.03.034
• Sessions, Alex L. (2016) Factors Controlling the Deuterium Contents of Sedimentary Hydrocarbons; Organic Geochemistry; Vol. 96; 43-64; 10.1016/j.orggeochem.2016.02.012
• Schimmelmann, Arndt and Qi, Haiping, el al. (2016) Organic Reference Materials for Hydrogen, Carbon, and Nitrogen Stable Isotope-Ratio Measurements: Caffeines, n-Alkanes, Fatty Acid Methyl Esters, Glycines, L-Valines, Polyethylenes, and Oils; Analytical Chemistry; Vol. 88; No. 8; 4294-4302; 10.1021/acs.analchem.5b04392
• Hansman, Roberta L. and Sessions, Alex L. (2016) Measuring the in situ carbon isotopic composition of distinct marine plankton populations sorted by flow cytometry; Limnology and Oceanography: Methods; Vol. 14; No. 2; 87-99; 10.1002/lom3.10073
• Kopf, Sebastian H. and Sessions, Alex L., el al. (2016) Trace incorporation of heavy water reveals slow and heterogeneous pathogen growth rates in cystic fibrosis sputum; Proceedings of the National Academy of Sciences of the United States of America; Vol. 113; No. 2; E110-E116; PMCID PMC4720290; 10.1073/pnas.1512057112
• Pacheco, Joshua J. and Labinger, Jay A., el al. (2015) Route to Renewable PET: Reaction Pathways and Energetics of Diels–Alder and Dehydrative Aromatization Reactions Between Ethylene and Biomass-Derived Furans Catalyzed by Lewis Acid Molecular Sieves; ACS Catalysis; Vol. 5; No. 10; 5904-5913; 10.1021/acscatal.5b01309
• Dawson, K. S. and Osburn, M. R., el al. (2015) Metabolic associations with archaea drive shifts in hydrogen isotope fractionation in sulfate-reducing bacterial lipids in cocultures and methane seeps; Geobiology; Vol. 13; No. 5; 462-477; 10.1111/gbi.12140
• Neubauer, C. and Dalleska, N. F., el al. (2015) Lipid remodeling in Rhodopseudomonas palustris TIE-1 upon loss of hopanoids and hopanoid methylation; Geobiology; Vol. 13; No. 5; 443-453; 10.1111/gbi.12143
• Stolper, D. A. and Martini, A. M., el al. (2015) Distinguishing and understanding thermogenic and biogenic sources of methane using multiply substituted isotopologues; Geochimica et Cosmochimica Acta; Vol. 161; 219-247; 10.1016/j.gca.2015.04.015
• Raven, Morgan Reed and Adkins, Jess F., el al. (2015) Sulfur isotopic composition of individual organic compounds from Cariaco Basin sediments; Organic Geochemistry; Vol. 80; 53-59; 10.1016/j.orggeochem.2015.01.002
• Summons, R. E. and Sessions, A. L., el al. (2014) Planning Considerations Related to the Organic Contamination of Martian Samples and Implications for the Mars 2020 Rover; Astrobiology; Vol. 14; No. 12; 969-1027; 10.1089/ast.2014.1244
• Crowe, Sean A. and Paris, Guillaume, el al. (2014) Sulfate was a trace constituent of Archean seawater; Science; Vol. 346; No. 6210; 735-739; 10.1126/science.1258966
• Paris, G. and Adkins, J. F., el al. (2014) Neoarchean carbonate-associated sulfate records positive Δ³³S anomalies; Science; Vol. 346; No. 6410; 739-741
• Niedermeyer, Eva M. and Sessions, Alex L., el al. (2014) Hydroclimate of the western Indo-Pacific Warm Pool during the past 24,000 years; Proceedings of the National Academy of Sciences of the United States of America; Vol. 111; No. 26; 9402-9406; PMCID PMC4084490; 10.1073/pnas.1323585111
• Stolper, D. A. and Lawson, M., el al. (2014) Formation temperatures of thermogenic and biogenic methane; Science; Vol. 344; No. 6191; 1500-1503; 10.1126/science.1254509
• Paris, Guillaume and Fehrenbacher, Jennifer S., el al. (2014) Experimental determination of carbonate-associated sulfate δ^(34)S in planktonic foraminifera shells; Geochemistry, Geophysics, Geosystems; Vol. 15; No. 4; 1452-1461; 10.1002/2014GC005295
• Ricci, Jessica N. and Coleman, Maureen L., el al. (2014) Diverse capacity for 2-methylhopanoid production correlates with a specific ecological niche; ISME Journal; Vol. 8; No. 3; 675-684; PMCID PMC3930323; 10.1038/ismej.2013.191
• Stolper, D. A. and Sessions, A. L., el al. (2014) Combined ^(13)C–D and D–D clumping in methane: Methods and preliminary results; Geochimica et Cosmochimica Acta; Vol. 126; 169-191; 10.1016/j.gca.2013.10.045
• Doughty, David M. and Dieterle, Michael, el al. (2014) Probing the Subcellular Localization of Hopanoid Lipids in Bacteria Using NanoSIMS; PLoS ONE; Vol. 9; No. 1; Art. No. e84455; PMCID PMC3883690; 10.1371/journal.pone.0084455
• Lee, C. and Fike, D. A., el al. (2013) Carbon isotopes and lipid biomarkers from organic-rich facies of the Shuram Formation, Sultanate of Oman; Geobiology; Vol. 11; No. 5; 406-419; 10.1111/gbi.12045
• Summons, R. E. and Bird, L. R., el al. (2013) Lipid biomarkers in ooids from different locations and ages: evidence for a common bacterial flora; Geobiology; Vol. 11; No. 5; 420-436; 10.1111/gbi.12047
• Lee, C. and Fike, D. A., el al. (2013) Carbon Isotope and Lipid Biomarker Stratigraphy from Organic-Rich Strata Through the Neoproterozoic Shuram Excursion in South Oman; Mineralogical Magazine; Vol. 77; No. 5; 1565; 10.1180/minmag.2013.077.5.12
• Morrill, Penny L. and Kuenen, J. Gijs, el al. (2013) Geochemistry and geobiology of a present-day serpentinization site in California: The Cedars; Geochimica et Cosmochimica Acta; Vol. 109; 222-240; 10.1016/j.gca.2013.01.043
• Paris, Guillaume and Sessions, Alex L., el al. (2013) MC-ICP-MS measurement of δ^(34)S and Δ^(33)S in small amounts of dissolved sulfate; Chemical Geology; Vol. 345; 50-61; 10.1016/j.chemgeo.2013.02.022
• Wang, Ying and Sessions, Alex L., el al. (2013) Equilibrium ^2H/^1H fractionation in organic molecules: III. Cyclic ketones and hydrocarbons; Geochimica et Cosmochimica Acta; Vol. 107; 82-95; 10.1016/j.gca.2013.01.001
• Sessions, Alex L. and Zhang, Lichun, el al. (2013) Identification and quantification of polyfunctionalized hopanoids by high temperature gas chromatography–mass spectrometry; Organic Geochemistry; Vol. 56; 120-130; PMCID PMC3780965; 10.1016/j.orggeochem.2012.12.009
• Eiler, John M. and Clog, Matthieu, el al. (2013) A high-resolution gas-source isotope ratio mass spectrometer; International Journal of Mass Spectrometry; Vol. 335; 45-56; 10.1016/j.ijms.2012.10.014
• Eiler, John and Clog, Matthieu, el al. (2012) The MAT-253 Ultra — a novel high-resolution, multi-collector gas source mass spectrometer; Mineralogical Magazine; Vol. 76; No. 6; 1680
• Stolper, Daniel A. and Sessions, Alex L., el al. (2012) Measurement of intact methane isotopologues, including ^(13)CH_3D; Mineralogical Magazine; Vol. 76; No. 6; 2413
• Ferreira, Alexandre A. and Santos Neto, Eugenio V., el al. (2012) ^2H/^1H ratio of hopanes, tricyclic and tetracyclic terpanes in oils and source rocks from the Potiguar Basin, Brazil; Organic Geochemistry; Vol. 51; 13-16; 10.1016/j.orggeochem.2012.07.007
• Bontognali, Tomaso R. R. and Sessions, Alex L., el al. (2012) Sulfur isotopes of organic matter preserved in 3.45-billion-year-old stromatolites reveal microbial metabolism; Proceedings of the National Academy of Sciences of the United States of America; Vol. 109; No. 38; 15146-15151; PMCID PMC3458326; 10.1073/pnas.1207491109
• Amrani, Alon and Deev, Andrei, el al. (2012) The sulfur-isotopic compositions of benzothiophenes and dibenzothiophenes as a proxy for thermochemical sulfate reduction; Geochimica et Cosmochimica Acta; Vol. 84; 152-164; 10.1016/j.gca.2012.01.023
• Sachse, Dirk and Billault, Isabelle, el al. (2012) Molecular Paleohydrology: Interpreting the Hydrogen-Isotopic Composition of Lipid Biomarkers from Photosynthesizing Organisms; Annual Review of Earth and Planetary Sciences; Vol. 40; 221-249; 10.1146/annurev-earth-042711-105535
• Doughty, David M. and Coleman, Maureen L., el al. (2011) The RND-family transporter, HpnN, is required for hopanoid localization to the outer membrane of Rhodopseudomonas palustris TIE-1; Proceedings of the National Academy of Sciences of the United States of America; Vol. 108; No. 45; E1045-E1051; PMCID PMC3215060; 10.1073/pnas.1104209108
• Bennett, Sarah A. and Hansman, Roberta L., el al. (2011) Tracing iron-fueled microbial carbon production within the hydrothermal plume at the Loihi seamount; Geochimica et Cosmochimica Acta; Vol. 75; No. 19; 5526-5539; 10.1016/j.gca.2011.06.039
• Osburn, Magdalena R. and Sessions, Alex L., el al. (2011) Hydrogen-isotopic variability in fatty acids from Yellowstone National Park hot spring microbial communities; Geochimica et Cosmochimica Acta; Vol. 75; No. 17; 4830-4845; 10.1016/j.gca.2011.05.038
• Li, Chao and Sessions, Alex L., el al. (2011) D/H variation in terrestrial lipids from Santa Barbara Basin over the past 1400 years: A preliminary assessment of paleoclimatic relevance; Organic Geochemistry; Vol. 42; No. 1; 15-24; 10.1016/j.orggeochem.2010.09.011
• Feakins, Sarah J. and Sessions, Alex L. (2010) Crassulacean acid metabolism influences D/H ratio of leaf wax in succulent plants; Organic Geochemistry; Vol. 41; No. 12; 1269-1276; 10.1016/j.orggeochem.2010.09.007
• Niedermeyer, Eva M. and Schefuß, Enno, el al. (2010) Orbital- and millennial-scale changes in the hydrologic cycle and vegetation in the western African Sahel: insights from individual plant wax δD and δ^(13)C; Quaternary Science Reviews; Vol. 29; No. 23-24; 2996-3005; 10.1016/j.quascirev.2010.06.039
• Redmond, Molly C. and Valentine, David L., el al. (2010) Identification of Novel Methane-, Ethane-, and Propane-Oxidizing Bacteria at Marine Hydrocarbon Seeps by Stable Isotope Probing; Applied and Environmental Microbiology; Vol. 76; No. 19; 6412-6422; PMCID PMC2950463; 10.1128/AEM.00271-10
• Sessions, Alex L. and Zhang, Xinning, el al. (2010) The importance of metabolism for lipid D/H ratios; Geochimica et Cosmochimica Acta; Vol. 74; No. 12; A936-A936; 10.1016/j.gca.2010.04.045
• Gao, L. and Schimmelmann, A., el al. (2010) Influence of water on D/H ratios of n-alkanes from hydrous pyrolysis of source rocks with kerogen types I, II, IIS and III; Geochimica et Cosmochimica Acta; Vol. 74; No. 12; A318-A318; 10.1016/j.gca.2010.04.032
• Welander, Paula V. and Coleman, Maureen L., el al. (2010) Identification of a methylase required for 2-methylhopanoid production and implications for the interpretation of sedimentary hopanes; Proceedings of the National Academy of Sciences of the United States of America; Vol. 107; No. 19; 8537-8542; PMCID PMC2889317; 10.1073/pnas.0912949107
• Li, Chao and Love, Gordon D., el al. (2010) A Stratified Redox Model for the Ediacaran Ocean; Science; Vol. 328; No. 5974; 80-83; 10.1126/science.1182369
• Feakins, Sarah J. and Sessions, Alex L. (2010) Controls on the D/H ratios of plant leaf waxes in an arid ecosystem; Geochimica et Cosmochimica Acta; Vol. 74; No. 7; 2128-2141; 10.1016/j.gca.2010.01.016
• Wang, Ying and Sessions, Alex L., el al. (2009) Equilibrium ^2H/^1H fractionations in organic molecules: I. Experimental calibration of ab initio calculations; Geochimica et Cosmochimica Acta; Vol. 73; No. 23; 7060-7075; 10.1016/j.gca.2009.08.019
• Wang, Ying Min and Sessions, Alex L., el al. (2009) Equilibrium ^2H/^1H fractionations in organic molecules. II: Linear alkanes, alkenes, ketones, carboxylic acids, esters, alcohols and ethers; Geochimica et Cosmochimica Acta; Vol. 73; No. 23; 7076-7086; 10.1016/j.gca.2009.08.018
• Amrani, Alon and Sessions, Alex L., el al. (2009) Compound-Specific δ^(34)S Analysis of Volatile Organics by Coupled GC/Multicollector-ICPMS; Analytical Chemistry; Vol. 81; No. 21; 9027-9034; 10.1021/ac9016538
• Marshall, Alison Olcott and Corsetti, Frank A., el al. (2009) Raman spectroscopy and biomarker analysis reveal multiple carbon inputs to a Precambrian glacial sediment; Organic Geochemistry; Vol. 40; No. 11; 1115-1123; 10.1016/j.orggeochem.2009.08.006
• Welander, Paula V. and Hunter, Ryan C., el al. (2009) Hopanoids Play a Role in Membrane Integrity and pH Homeostasis in Rhodopseudomonas palustris TIE-1; Journal of Bacteriology; Vol. 191; No. 19; 6145-6156; PMCID PMC2747905; 10.1128/JB.00460-09
• Li, Chao and Sessions, Alex L., el al. (2009) Hydrogen-isotopic variability in lipids from Santa Barbara Basin sediments; Geochimica et Cosmochimica Acta; Vol. 73; No. 16; 4803-4823; 10.1016/j.gca.2009.05.056
• Zhang, Xinning and Gillespie, Aimee L., el al. (2009) Large D/H variations in bacterial lipids reflect central metabolic pathways; Proceedings of the National Academy of Sciences of the United States of America; Vol. 106; No. 31; 12580-12586; PMCID PMC2722351; 10.1073/pnas.0903030106
• Sessions, Alex L. and Doughty, David M., el al. (2009) The Continuing Puzzle of the Great Oxidation Event; Current Biology; Vol. 19; No. 14; R567-R574; 10.1016/j.cub.2009.05.054
• Li, Chao and Love, Gordon D., el al. (2009) A geochemical redox model for Ediacaran ocean chemistry in Nanhua Basin, South China; Geochimica et Cosmochimica Acta; Vol. 73; No. S13; A750; 10.1016/j.gca.2009.05.010
• Campbell, Brian J. and Li, Chao, el al. (2009) Hydrogen isotopic fractionation in lipid biosynthesis by H_2-consuming Desulfobacterium autotrophicum; Geochimica et Cosmochimica Acta; Vol. 73; No. 10; 2744-2757; 10.1016/j.gca.2009.02.034
• Sauer, Peter E. and Schimmelmann, Arndt, el al. (2009) Simplified batch equilibration for D/H determination of non-exchangeable hydrogen in solid organic material; Rapid Communications in Mass Spectrometry; Vol. 23; No. 7; 949-956; 10.1002/rcm.3954
• Wang, Ying and Sessions, Alex L. (2008) Memory Effects in Compound-Specific D/H Analysis by Gas Chromatography/Pyrolysis/Isotope-Ratio Mass Spectrometry; Analytical Chemistry; Vol. 80; No. 23; 9162-9170; 10.1021/ac801170v
• Zhang, Xinning and Sessions, A. (2008) Variations in D/H fractionation associated with microbial heterotrophy; Geochimica et Cosmochimica Acta; Vol. 72; No. S12; A1089; 10.1016/j.gca.2008.05.028
• Wang, Ying and Sessions, Alex L. (2008) Equilibrium D/H fractionation of carbon-bound hydrogen; Geochimica et Cosmochimica Acta; Vol. 72; No. S12; A1003; 10.1016/j.gca.2008.05.025
• Amrani, Alon and Sessions, Alex L., el al. (2008) Development of coupled GC/ICPMS for analysis of δ^(34)S in individual organic compounds; Geochimica et Cosmochimica Acta; Vol. 72; No. 12; A20; 10.1016/j.gca.2008.05.004
• Jones, Ashley A. and Sessions, Alex L., el al. (2008) D/H ratios of fatty acids from marine particulate organic matter in the California Borderland Basins; Organic Geochemistry; Vol. 39; No. 5; 485-500; 10.1016/j.orggeochem.2007.11.001
• Pearson, Ann and Kraunz, Kimberly S., el al. (2008) Quantifying microbial utilization of petroleum hydrocarbons in salt-marsh sediments using the ^(13)C content of bacterial rRNA; Applied and Environmental Microbiology; Vol. 74; No. 4; 1157-1166; PMCID PMC2258585; 10.1128/AEM.01014-07
• Rashby, Sky E. and Sessions, Alex L., el al. (2007) Biosynthesis of 2-methylbacteriohopanepolyols by an anoxygenic phototroph; Proceedings of the National Academy of Sciences of the United States of America; Vol. 104; No. 38; 15099-15014; PMCID PMC1986619; 10.1073/pnas.0704912104
• Lyons, T. and Raiswell, R., el al. (2007) Carbonate concretions as a window to the evolving chemistry of the early ocean and atmosphere; Geochimica et Cosmochimica Acta; Vol. 71; No. S15; A606; 10.1016/j.gca.2007.06.020
• Eek, K. M. and Sessions, A. L., el al. (2007) Carbon-isotopic analysis of microbial cells sorted by flow cytometry; Geobiology; Vol. 5; No. 1; 85-95; 10.1111/j.1472-4669.2006.00094.x
• Eglinton, T. I. and Ohkouchi, N., el al. (2006) Multi-isotopic constraints on the origin and fate of n-alkyl lipids in recent sediments; Geochimica et Cosmochimica Acta; Vol. 70; No. 18; A156; 10.1016/j.gca.2006.06.1378
• Sessions, Alex L. (2006) Isotope-ratio detection for gas chromatography; Journal of Separation Science; Vol. 29; No. 12; 1946-1961; 10.1002/jssc.200600002
• Summons, R. E. and Grosjean, E., el al. (2006) Carbon and hydrogen isotopic analysis of hydrocarbons from the South Oman Salt Basin; Geochimica et Cosmochimica Acta; Vol. 70; No. S18; A625; 10.1016/j.gca.2006.06.1160
• Olcott, A. N. and Li, C., el al. (2006) Biogeochemistry of neoproterozoic low latitude glaciations; Geochimica et Cosmochimica Acta; Vol. 70; No. 18; A456; 10.1016/j.gca.2006.06.918
• Sessions, A. L. and Wang, Y. (2006) Equilibrium D/H fractionation of organic hydrogen; Geochimica et Cosmochimica Acta; Vol. 70; No. S18; A572; 10.1016/j.gca.2006.06.1059
• Schimmelmann, Arndt and Sessions, Alex L., el al. (2006) Hydrogen isotopic (D/H) composition of organic matter during diagenesis and thermal maturation; Annual Review of Earth and Planetary Sciences; Vol. 34; 501-533; 10.1146/annurev.earth.34.031405.125011
• Sessions, Alex L. (2006) Seasonal changes in D/H fractionation accompanying lipid biosynthesis in Spartina alterniflora; Geochimica et Cosmochimica Acta; Vol. 70; No. 9; 2153-2162; 10.1016/j.gca.2006.02.003
• Olcott, Alison N. and Sessions, Alex L., el al. (2005) Biomarker Evidence for Photosynthesis During Neoproterozoic Glaciation; Science; Vol. 310; No. 5747; 471-474; 10.1126/science.1115769
• Sessions, Alex L. and Sylva, Sean P., el al. (2005) Moving-Wire Device for Carbon Isotopic Analyses of Nanogram Quantities of Nonvolatile Organic Carbon; Analytical Chemistry; Vol. 77; No. 20; 6519-6527; 10.1021/ac051251z
• Sessions, Alex L. (2005) Controls on the D/H composition of individual petroleum hydrocarbons; Geochimica et Cosmochimica Acta; Vol. 69; No. S10; A500; 10.1016/j.gca.2005.03.031
• Sessions, Alex L. and Hayes, John M. (2005) Calculation of hydrogen isotopic fractionations in biogeochemical systems; Geochimica et Cosmochimica Acta; Vol. 69; No. 3; 593-597; 10.1016/j.gca.2004.08.005
• Pearson, Ann and Sessions, Alex L., el al. (2004) Phylogenetically specific separation of rRNA from prokaryotes for isotopic analysis; Marine Chemistry; Vol. 92; No. 1-4; 295-306; 10.1016/j.marchem.2004.06.032
• McDuffee, Kelsey E. and Eglinton, Timothy I., el al. (2004) Rapid analysis of 13C in plant-wax n-alkanes for reconstruction of terrestrial vegetation signals from aquatic sediments; Geochemistry, Geophysics, Geosystems; Vol. 5; No. 10; Art. No. 2004GC000772; 10.1029/2004GC000772
• Schimmelmann, Arndt and Sessions, Alex L., el al. (2004) D/H ratios in terrestrially sourced petroleum systems; Organic Geochemistry; Vol. 35; No. 10; 1169-1195; 10.1016/j.orggeochem.2004.05.006
• Schneider, R. J. and Kim, S.-W, el al. (2004) A gas ion source for continuous-flow AMS; Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms; Vol. 223; 149-154; 10.1016/j.nimb.2004.04.031
• Valentine, D. L. and Sessions, A. L., el al. (2004) Hydrogen isotope fractionation during H_2/CO_2 acetogenesis: hydrogen utilization efficiency and the origin of lipid-bound hydrogen; Geobiology; Vol. 2; No. 3; 179-188; 10.1111/j.1472-4677.2004.00030.x
• Sessions, Alex L. and Sylva, Sean P., el al. (2004) Isotopic exchange of carbon-bound hydrogen over geologic timescales; Geochimica et Cosmochimica Acta; Vol. 68; No. 7; 1545-1559; 10.1016/j.gca.2003.06.004
• Sessions, Alex L. and Jahnke, Linda L., el al. (2002) Hydrogen isotope fractionation in lipids of the methane-oxidizing bacterium Methylococcus capsulatus; Geochimica et Cosmochimica Acta; Vol. 66; No. 22; 3955-3969; 10.1016/S0016-7037(02)00981-X
• Sessions, Alex and Schimmelmann, Arndt, el al. (2002) Hydrogen isotopic compositions of petroleum hydrocarbons; Geochimica et Cosmochimica Acta; Vol. 66; No. 15A; A697; 10.1016/S0016-7037(02)01012-8
• Sessions, Alex L. and Burgoyne, Thomas W., el al. (2001) Determination of the H_3 Factor in Hydrogen Isotope Ratio Monitoring Mass Spectrometry; Analytical Chemistry; Vol. 73; No. 2; 200-207; 10.1021/ac000488m
• Sessions, Alex L. and Burgoyne, Thomas W., el al. (2001) Correction of H_3^+ Contributions in Hydrogen Isotope Ratio Monitoring Mass Spectrometry; Analytical Chemistry; Vol. 73; No. 2; 192-199; 10.1021/ac000489e
• Sauer, Peter E. and Eglinton, Timothy I., el al. (2001) Compound-specific D/H ratios of lipid biomarkers from sediments as a proxy for environmental and climatic conditions; Geochimica et Cosmochimica Acta; Vol. 65; No. 2; 213-222; 10.1016/S0016-7037(00)00520-2
• Sessions, Alex L. and Burgoyne, Thomas W., el al. (1999) Fractionation of hydrogen isotopes in lipid biosynthesis; Organic Geochemistry; Vol. 30; No. 9; 1193-1200; 10.1016/S0146-6380(99)00094-7