Confirmation of Δ<sup>2</sup>-sterenes as precursors of 3-methylsteranes
Emma R. Hartke, Katherine Haines Freeman, Jennifer L. Macalady, Ran He, Simon C. Brassell,
Oct 2026,
In: Organic Geochemistry
Date: Oct 2026
Metabolic flux controls on carbon isotope patterns in algal lipids
Juliana K. Drozd, Elliott P. Mueller, Katherine H. Freeman,
Jul 2026,
In: Organic Geochemistry
Date: Jul 2026
Multiple formation pathways for amino acids in the early Solar System based on carbon and nitrogen isotopes in asteroid Bennu samples
Allison A. Baczynski, Ophélie M. McIntosh, Danielle N. Simkus, Hannah L. McLain, Jason P. Dworkin, Daniel P. Glavin, Jamie E. Elsila, Mila Matney, Christopher H. House, Katherine H. Freeman, Harold C. Connolly, Dante S. Lauretta,
Feb 24 2026,
In: Proceedings of the National Academy of Sciences of the United States of America
Date: Feb 24 2026
Temperature Sensitivity of Leaf Wax n-Alkane Carbon Isotopes
Hao Xie, Max K. Lloyd, Allison A. Baczynski, Aaron F. Diefendorf, Katherine Haines Freeman,
Feb 16 2026,
In: Geophysical Research Letters
Date: Feb 16 2026
Stable Nitrogen Isotope Analysis of Amino Acids by Orbitrap Mass Spectrometry
O. M. McIntosh, A. A. Baczynski, M. Matney, H. L. McLain, K. K. Farnsworth, J. P. Dworkin, D. P. Glavin, J. E. Elsila, H. Xie, K. H. Freeman,
Dec 15 2025,
In: Rapid Communications in Mass Spectrometry
Date: Dec 15 2025
Molecular Average and Intramolecular δ<sup>13</sup>C Measurements of Pyruvic Acid and Acetic Acid Using Gas Chromatography Orbitrap Mass Spectrometry (GC Orbitrap-MS)
Youki J. Sato, Allison A. Baczynski, Hao Xie, Alexis Gilbert, Katherine H. Freeman,
Sep 9 2025,
In: Analytical Chemistry
Date: Sep 9 2025
Introduction
Katherine H. Freeman, Raymond Jeanloz,
May 30 2025,
In: Annual Review of Earth and Planetary Sciences
Date: May 30 2025
Corrigendum to “Fire distinguishers
A. Tyler Karp, Alex I. Holman, Peter Hopper, Kliti Grice, Katherine H. Freeman,
Apr 15 2025,
In: Geochimica et Cosmochimica Acta
Date: Apr 15 2025
CONFIRMATION OF D<sup>2</sup>-STERENES AS PRECURSORS OF 3-METHYLSTERANES
E. R. Hartke, Katherine Haines Freeman, J. L. Macalady, R. He, S. C. Brassell,
2025,
In: 32nd International Meeting on Organic Geochemistry, IMOG 2025
Date: 2025
MICROBIAL LIPID ADAPTIONS OF BIOFILM-FORMING, SULFIDE-OXIDZING BACTERIA INHABITING SULFIDIC CAVES IN CENTRAL ITALY
A. McDonnell, L. Levin, E. Hartke, K. S. Dawson, C. L. Grettenberger, Katherine Haines Freeman, J. L. Macalady, F. Schubotz,
2025,
In: 32nd International Meeting on Organic Geochemistry, IMOG 2025
Date: 2025
Molecular paleohydrology
Dirk Sachse, Isabelle Billault, Gabriel J. Bowen, Yoshito Chikaraishi, Todd E. Dawson, Sarah J. Feakins, Katherine H. Freeman, Clayton R. Magill, Francesca A. McInerney, Marcel T.J. Van Der Meer, Pratigya Polissar, Richard J. Robins, Julian P. Sachs, Hanns Ludwig Schmidt, Alex L. Sessions, James W.C...,
May 2012,
In: Annual Review of Earth and Planetary Sciences
Citations: 903
Global patterns in leaf <sup>13</sup>C discrimination and implications for studies of past and future climate
Aaron F. Diefendorf, Kevin E. Mueller, Scott L. Wing, Paul L. Koch, Katherine H. Freeman,
Mar 30 2010,
In: Proceedings of the National Academy of Sciences of the United States of America
Citations: 806
Atmospheric science
Mark Pagani, James C. Zachos, Katherine H. Freeman, Brett Tipple, Stephen Bohaty,
Jul 22 2005,
In: Science
Citations: 785
Compound-specific isotopic analyses
J. M. Hayes, Katherine H. Freeman, Brian N. Popp, Christopher H. Hoham,
1990,
In: Organic Geochemistry
Citations: 749
Fractionation of carbon isotopes by phytoplankton and estimates of ancient CO<sub>2</sub> levels
Katherine H. Freeman, J. M. Hayes,
Jun 1992,
In: Global Biogeochemical Cycles
Citations: 576
Paleontology
Scott L. Wing, Guy J. Harrington, Francesca A. Smith, Jonathan I. Bloch, Douglas M. Boyer, Katherine H. Freeman,
Nov 11 2005,
In: Science
Citations: 532
Evidence from carbon isotope measurements for diverse origins of sedimentary hydrocarbons
Katherine H. Freeman, J. M. Hayes, Jean Michel Trendel, Pierre Albrecht,
1990,
In: Nature
Citations: 532
Late miocene atmospheric CO<sub>2</sub> concentrations and the expansion of C<sub>4</sub> grasses
Mark Pagani, Katherine H. Freeman, Michael A. Arthur,
Aug 6 1999,
In: Science
Citations: 434
Miocene evolution of atmospheric carbon dioxide
Mark Pagani, Michael A. Arthur, Katherine H. Freeman,
Jun 1999,
In: Paleoceanography
Citations: 411
Consistent fractionation of<sup>13</sup>C in nature and in the laboratory
Robert R. Bidigare, Amim Fluegge, Katherine H. Freeman, Kristi L. Hanson, John M. Hayes, David Hollander, John P. Jasper, Linda L. King, Edward A. Laws, Jeffrey Milder, Frank J. Millero, Richard Pancost, Brian N. Popp, Paul A. Steinberg, Stuart G. Wakeham,
1997,
In: Global Biogeochemical Cycles
Citations: 357
