| Year |
Citation |
Score |
| 2023 |
Zeichner SS, Aponte JC, Bhattacharjee S, Dong G, Hofmann AE, Dworkin JP, Glavin DP, Elsila JE, Graham HV, Naraoka H, Takano Y, Tachibana S, Karp AT, Grice K, Holman AI, ... Freeman KH, et al. Polycyclic aromatic hydrocarbons in samples of Ryugu formed in the interstellar medium. Science (New York, N.Y.). 382: 1411-1416. PMID 38127762 DOI: 10.1126/science.adg6304 |
0.805 |
|
| 2023 |
Baczynski AA, Brodie CR, Kracht O, Freeman KH. Sequential measurement of C, N, and S isotopic composition on nanomolar quantities of carbon, nitrogen, and sulfur using nano-elemental analysis/isotope ratio mass spectrometry. Rapid Communications in Mass Spectrometry : Rcm. 37: e9444. PMID 36744828 DOI: 10.1002/rcm.9444 |
0.321 |
|
| 2020 |
Lyons SL, Karp AT, Bralower TJ, Grice K, Schaefer B, Gulick SPS, Morgan JV, Freeman KH. Organic matter from the Chicxulub crater exacerbated the K-Pg impact winter. Proceedings of the National Academy of Sciences of the United States of America. PMID 32989138 DOI: 10.1073/pnas.2004596117 |
0.35 |
|
| 2020 |
Sistiaga A, Husain F, Uribelarrea D, Martín-Perea DM, Ferland T, Freeman KH, Diez-Martín F, Baquedano E, Mabulla A, Domínguez-Rodrigo M, Summons RE. Microbial biomarkers reveal a hydrothermally active landscape at Olduvai Gorge at the dawn of the Acheulean, 1.7 Ma. Proceedings of the National Academy of Sciences of the United States of America. PMID 32934140 DOI: 10.1073/Pnas.2004532117 |
0.365 |
|
| 2020 |
Schaefer B, Grice K, Coolen MJ, Summons RE, Cui X, Bauersachs T, Schwark L, Böttcher ME, Bralower TJ, Lyons SL, Freeman KH, Cockell CS, Gulick SP, Morgan JV, Whalen MT, et al. Microbial life in the nascent Chicxulub crater Geology. 48: 328-332. DOI: 10.1130/G46799.1 |
0.408 |
|
| 2020 |
Shilling AM, Colcord DE, Karty J, Hansen A, Freeman KH, Njau JK, Stanistreet IG, Stollhofen H, Schick KD, Toth N, Brassell SC. Biogeochemical evidence from OGCP Core 2A sediments for environmental changes preceding deposition of Tuff IB and climatic transitions in Upper Bed I of the Olduvai Basin Palaeogeography, Palaeoclimatology, Palaeoecology. 555: 109824. DOI: 10.1016/J.Palaeo.2020.109824 |
0.49 |
|
| 2020 |
Karp AT, Holman AI, Hopper P, Grice K, Freeman KH. Fire Distinguishers: Refined interpretations of polycyclic aromatic hydrocarbons for paleo-applications Geochimica Et Cosmochimica Acta. 289: 93-113. DOI: 10.1016/J.Gca.2020.08.024 |
0.408 |
|
| 2020 |
Bralower T, Cosmidis J, Heaney PJ, Kump L, Morgan JV, Harper DT, Lyons SL, Freeman KH, Grice K, Wendler JE, Zachos JC, Artemieva N, Chen SA, Gulick SPS, House CH, et al. Origin of a global carbonate layer deposited in the aftermath of the Cretaceous-Paleogene boundary impact Earth and Planetary Science Letters. 548: 116476. DOI: 10.1016/J.Epsl.2020.116476 |
0.624 |
|
| 2019 |
Gulick SPS, Bralower TJ, Ormö J, Hall B, Grice K, Schaefer B, Lyons S, Freeman KH, Morgan JV, Artemieva N, Kaskes P, de Graaff SJ, Whalen MT, Collins GS, Tikoo SM, et al. The first day of the Cenozoic. Proceedings of the National Academy of Sciences of the United States of America. PMID 31501350 DOI: 10.1073/Pnas.1909479116 |
0.367 |
|
| 2019 |
Bird LR, Dawson KS, Chadwick GL, Fulton JM, Orphan VJ, Freeman KH. Carbon isotopic heterogeneity of coenzyme F430 and membrane lipids in methane-oxidizing archaea. Geobiology. PMID 31364272 DOI: 10.1111/Gbi.12354 |
0.779 |
|
| 2019 |
Goulden SKE, Ohkouchi N, Freeman KH, Chikaraishi Y, Ogawa NO, Suga H, Chadwick O, Houlton BZ. Strong correspondence between nitrogen isotope composition of foliage and chlorin across a rainfall gradient: implications for paleo-reconstruction of the nitrogen cycle Biogeosciences. 16: 3869-3882. DOI: 10.5194/Bg-16-3869-2019 |
0.409 |
|
| 2019 |
Graham HV, Herrera F, Jaramillo C, Wing SL, Freeman KH. Canopy structure in Late Cretaceous and Paleocene forests as reconstructed from carbon isotope analyses of fossil leaves Geology. 47: 977-981. DOI: 10.1130/G46152.1 |
0.757 |
|
| 2019 |
Chritz KL, Cerling TE, Freeman KH, Hildebrand EA, Janzen A, Prendergast ME. Climate, ecology, and the spread of herding in eastern Africa Quaternary Science Reviews. 204: 119-132. DOI: 10.1016/J.Quascirev.2018.11.029 |
0.413 |
|
| 2019 |
Shilling AM, Colcord DE, Karty J, Hansen A, Freeman KH, Njau JK, Stanistreet IG, Stollhofen H, Schick KD, Toth N, Brassell SC. Biogeochemical evidence for environmental changes of Pleistocene Lake Olduvai during the transitional sequence of OGCP core 2A that encompasses Tuff IB (~1.848 Ma) Palaeogeography, Palaeoclimatology, Palaeoecology. 532: 109267. DOI: 10.1016/J.Palaeo.2019.109267 |
0.425 |
|
| 2019 |
Colcord DE, Shilling AM, Freeman KH, Njau JK, Stanistreet IG, Stollhofen H, Schick KD, Toth N, Brassell SC. Aquatic biomarkers record Pleistocene environmental changes at Paleolake Olduvai, Tanzania Palaeogeography, Palaeoclimatology, Palaeoecology. 524: 250-261. DOI: 10.1016/J.Palaeo.2019.04.001 |
0.451 |
|
| 2018 |
Angst G, Mueller KE, Eissenstat DM, Trumbore S, Freeman KH, Hobbie SE, Chorover J, Oleksyn J, Reich PB, Mueller CW. Soil organic carbon stability in forests: distinct effects of tree species identity and traits. Global Change Biology. PMID 30554462 DOI: 10.1111/Gcb.14548 |
0.341 |
|
| 2018 |
Karp AT, Behrensmeyer AK, Freeman KH. Grassland fire ecology has roots in the late Miocene. Proceedings of the National Academy of Sciences of the United States of America. PMID 30429316 DOI: 10.1073/Pnas.1809758115 |
0.408 |
|
| 2018 |
Puente-Sánchez F, Arce-Rodríguez A, Oggerin M, García-Villadangos M, Moreno-Paz M, Blanco Y, Rodríguez N, Bird L, Lincoln SA, Tornos F, Prieto-Ballesteros O, Freeman KH, Pieper DH, Timmis KN, Amils R, et al. Viable cyanobacteria in the deep continental subsurface. Proceedings of the National Academy of Sciences of the United States of America. PMID 30275328 DOI: 10.1073/Pnas.1808176115 |
0.377 |
|
| 2018 |
McClure SB, Magill C, Podrug E, Moore AMT, Harper TK, Culleton BJ, Kennett DJ, Freeman KH. Fatty acid specific δ13C values reveal earliest Mediterranean cheese production 7,200 years ago. Plos One. 13: e0202807. PMID 30183735 DOI: 10.1371/Journal.Pone.0202807 |
0.334 |
|
| 2018 |
Nguyen UT, Lincoln SA, Valladares Juárez AG, Schedler M, Macalady JL, Müller R, Freeman KH. The influence of pressure on crude oil biodegradation in shallow and deep Gulf of Mexico sediments. Plos One. 13: e0199784. PMID 29969471 DOI: 10.1371/Journal.Pone.0199784 |
0.333 |
|
| 2018 |
Fulton JM, Arthur MA, Thomas B, Freeman KH. Pigment carbon and nitrogen isotopic signatures in euxinic basins. Geobiology. PMID 29577577 DOI: 10.1111/Gbi.12285 |
0.819 |
|
| 2018 |
Baczynski AA, Polissar PJ, Juchelka D, Schwieters J, Hilkert A, Summons RE, Freeman KH. Pico-CSIA: Picomolar Scale Compound-Specific Isotope Analyses. Rapid Communications in Mass Spectrometry : Rcm. PMID 29446506 DOI: 10.1002/Rcm.8084 |
0.401 |
|
| 2018 |
Lyons SL, Baczynski AA, Babila TL, Bralower TJ, Hajek EA, Kump LR, Polites EG, Self-Trail JM, Trampush SM, Vornlocher JR, Zachos JC, Freeman KH. Palaeocene–Eocene Thermal Maximum prolonged by fossil carbon oxidation Nature Geoscience. 12: 54-60. DOI: 10.1038/S41561-018-0277-3 |
0.656 |
|
| 2018 |
Arnold TE, Diefendorf AF, Brenner M, Freeman KH, Baczynski AA. Climate response of the Florida Peninsula to Heinrich events in the North Atlantic Quaternary Science Reviews. 194: 1-11. DOI: 10.1016/J.Quascirev.2018.06.012 |
0.765 |
|
| 2018 |
Colcord DE, Shilling AM, Sauer PE, Freeman KH, Njau JK, Stanistreet IG, Stollhofen H, Schick KD, Toth N, Brassell SC. Sub-Milankovitch paleoclimatic and paleoenvironmental variability in East Africa recorded by Pleistocene lacustrine sediments from Olduvai Gorge, Tanzania Palaeogeography, Palaeoclimatology, Palaeoecology. 495: 284-291. DOI: 10.1016/J.Palaeo.2018.01.023 |
0.468 |
|
| 2017 |
Hamilton TL, Welander PV, Albrecht HL, Fulton JM, Schaperdoth I, Bird LR, Summons RE, Freeman KH, Macalady JL. Microbial communities and organic biomarkers in a Proterozoic-analog sinkhole. Geobiology. 15: 784-797. PMID 29035021 DOI: 10.1111/Gbi.12252 |
0.749 |
|
| 2017 |
Tierney JE, Freeman KH. Carbon and ancient climates Nature Geoscience. 10: 6-6. DOI: 10.1038/Ngeo2867 |
0.408 |
|
| 2017 |
Podlaha OG, Sessions AL, Freeman K. 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. 108: 113-116. DOI: 10.1016/J.Orggeochem.2017.04.002 |
0.658 |
|
| 2017 |
Denis EH, Pedentchouk N, Schouten S, Pagani M, Freeman KH. Fire and ecosystem change in the Arctic across the Paleocene–Eocene Thermal Maximum Earth and Planetary Science Letters. 467: 149-156. DOI: 10.1016/J.Epsl.2017.03.021 |
0.623 |
|
| 2017 |
Angst G, Mueller KE, Kögel-Knabner I, Freeman KH, Mueller CW. Aggregation controls the stability of lignin and lipids in clay-sized particulate and mineral associated organic matter Biogeochemistry. 132: 307-324. DOI: 10.1007/S10533-017-0304-2 |
0.351 |
|
| 2016 |
Magill CR, Ashley GM, Domínguez-Rodrigo M, Freeman KH. Dietary options and behavior suggested by plant biomarker evidence in an early human habitat. Proceedings of the National Academy of Sciences of the United States of America. PMID 26903646 DOI: 10.1073/Pnas.1507055113 |
0.312 |
|
| 2016 |
Currie BS, Polissar PJ, Rowley DB, Ingalls M, Li S, Olack G, Freeman KH. Multiproxy paleoaltimetry of the late oligocene-pliocene Oiyug Basin, Southern Tibet American Journal of Science. 316: 401-436. DOI: 10.2475/05.2016.01 |
0.499 |
|
| 2016 |
Baczynski AA, McInerney FA, Wing SL, Kraus MJ, Morse PE, Bloch JI, Chung AH, Freeman KH. Distortion of carbon isotope excursion in bulk soil organic matter during the Paleocene-Eocene thermal maximum Bulletin of the Geological Society of America. 128: 1352-1366. DOI: 10.1130/B31389.1 |
0.504 |
|
| 2015 |
Baker PA, Fritz SC, Silva CG, Rigsby CA, Absy ML, Almeida RP, Caputo M, Chiessi CM, Cruz FW, Dick CW, Feakins SJ, Figueiredo J, Freeman KH, Hoorn C, Jaramillo C, et al. Trans-Amazon Drilling Project (TADP): Origins and evolution of the forests, climate, and hydrology of the South American tropics Scientific Drilling. 20: 41-49. DOI: 10.5194/Sd-20-41-2015 |
0.387 |
|
| 2015 |
Junium CK, Freeman KH, Arthur MA. Controls on the stratigraphic distribution and nitrogen isotopic composition of zinc, vanadyl and free base porphyrins through Oceanic Anoxic Event 2 at Demerara Rise Organic Geochemistry. 80: 60-71. DOI: 10.1016/J.Orggeochem.2014.10.009 |
0.647 |
|
| 2015 |
Cui Y, Bercovici A, Yu J, Kump LR, Freeman KH, Su S, Vajda V. Carbon cycle perturbation expressed in terrestrial Permian-Triassic boundary sections in South China Global and Planetary Change. DOI: 10.1016/J.Gloplacha.2015.10.018 |
0.495 |
|
| 2015 |
Junium CK, Arthur MA, Freeman KH. Compound-specific δ<sup>15</sup>N and chlorin preservation in surface sediments of the Peru Margin with implications for ancient bulk δ<sup>15</sup>N records Geochimica Et Cosmochimica Acta. 160: 306-318. DOI: 10.1016/J.Gca.2014.12.018 |
0.646 |
|
| 2015 |
Diefendorf AF, Freeman KH, Wing SL, Currano ED, Mueller KE. Paleogene plants fractionated carbon isotopes similar to modern plants Earth and Planetary Science Letters. 429: 33-44. DOI: 10.1016/J.Epsl.2015.07.029 |
0.745 |
|
| 2014 |
Freeman KH. Earth science: controls on isotopic gradients in rain. Nature. 516: 41-2. PMID 25471876 DOI: 10.1038/516041A |
0.365 |
|
| 2014 |
Belmecheri S, Maxwell RS, Taylor AH, Davis KJ, Freeman KH, Munger WJ. Tree-ring δ 13C tracks flux tower ecosystem productivity estimates in a NE temperate forest Environmental Research Letters. 9. DOI: 10.1088/1748-9326/9/7/074011 |
0.406 |
|
| 2014 |
Diefendorf AF, Freeman KH, Wing SL. A comparison of terpenoid and leaf fossil vegetation proxies in Paleocene and Eocene Bighorn Basin sediments Organic Geochemistry. 71: 30-42. DOI: 10.1016/J.Orggeochem.2014.04.004 |
0.742 |
|
| 2014 |
Graham HV, Patzkowsky ME, Wing SL, Parker GG, Fogel ML, Freeman KH. Isotopic characteristics of canopies in simulated leaf assemblages Geochimica Et Cosmochimica Acta. 144: 82-95. DOI: 10.1016/J.Gca.2014.08.032 |
0.75 |
|
| 2013 |
Close HG, Shah SR, Ingalls AE, Diefendorf AF, Brodie EL, Hansman RL, Freeman KH, Aluwihare LI, Pearson A. Export of submicron particulate organic matter to mesopelagic depth in an oligotrophic gyre. Proceedings of the National Academy of Sciences of the United States of America. 110: 12565-70. PMID 23858459 DOI: 10.1073/Pnas.1217514110 |
0.763 |
|
| 2013 |
Kennett DJ, Hajdas I, Culleton BJ, Belmecheri S, Martin S, Neff H, Awe J, Graham HV, Freeman KH, Newsom L, Lentz DL, Anselmetti FS, Robinson M, Marwan N, Southon J, et al. Correlating the ancient Maya and modern European calendars with high-precision AMS 14C dating. Scientific Reports. 3: 1597. PMID 23579869 DOI: 10.1038/Srep01597 |
0.707 |
|
| 2013 |
Magill CR, Ashley GM, Freeman KH. Water, plants, and early human habitats in eastern Africa. Proceedings of the National Academy of Sciences of the United States of America. 110: 1175-80. PMID 23267102 DOI: 10.1073/Pnas.1209405109 |
0.473 |
|
| 2013 |
Magill CR, Ashley GM, Freeman KH. Ecosystem variability and early human habitats in eastern Africa. Proceedings of the National Academy of Sciences of the United States of America. 110: 1167-74. PMID 23267092 DOI: 10.1073/Pnas.1206276110 |
0.518 |
|
| 2013 |
Dawson KS, Schaperdoth I, Freeman KH, Macalady JL. Anaerobic biodegradation of the isoprenoid biomarkers pristane and phytane Organic Geochemistry. 65: 118-126. DOI: 10.1016/J.Orggeochem.2013.10.010 |
0.381 |
|
| 2013 |
Pancost RD, Freeman KH, Herrmann AD, Patzkowsky ME, Ainsaar L, Martma T. Reconstructing Late Ordovician carbon cycle variations Geochimica Et Cosmochimica Acta. 105: 433-454. DOI: 10.1016/J.Gca.2012.11.033 |
0.504 |
|
| 2012 |
Jones DS, Albrecht HL, Dawson KS, Schaperdoth I, Freeman KH, Pi Y, Pearson A, Macalady JL. Community genomic analysis of an extremely acidophilic sulfur-oxidizing biofilm. The Isme Journal. 6: 158-70. PMID 21716305 DOI: 10.1038/Ismej.2011.75 |
0.775 |
|
| 2012 |
Sachse D, Billault I, Bowen GJ, Chikaraishi Y, Dawson TE, Feakins SJ, Freeman KH, Magill CR, McInerney FA, Van Der Meer MTJ, Polissar P, Robins RJ, Sachs JP, Schmidt HL, Sessions AL, et al. Molecular paleohydrology: Interpreting the hydrogen-isotopic composition of lipid biomarkers from photosynthesizing organisms Annual Review of Earth and Planetary Sciences. 40: 221-249. DOI: 10.1146/Annurev-Earth-042711-105535 |
0.654 |
|
| 2012 |
Algeo T, Henderson CM, Ellwood B, Rowe H, Elswick E, Bates S, Lyons T, Hower JC, Smith C, Maynard B, Hays LE, Summons RE, Fulton J, Freeman KH. Evidence for a diachronous Late Permian marine crisis from the Canadian Arctic region Bulletin of the Geological Society of America. 124: 1424-1448. DOI: 10.1130/B30505.1 |
0.753 |
|
| 2012 |
Cui Y, Kump LR, Ridgwell AJ, Charles AJ, Junium CK, Diefendorf AF, Freeman KH, Urban NM, Harding IC. Reply to 'Constraints on hyperthermals' Nature Geoscience. 5: 231-232. DOI: 10.1038/Ngeo1424 |
0.651 |
|
| 2012 |
Fulton JM, Arthur MA, Freeman KH. Black Sea nitrogen cycling and the preservation of phytoplankton δ15N signals during the Holocene Global Biogeochemical Cycles. 26. DOI: 10.1029/2011Gb004196 |
0.823 |
|
| 2012 |
Mueller KE, Polissar PJ, Oleksyn J, Freeman KH. Differentiating temperate tree species and their organs using lipid biomarkers in leaves, roots and soil Organic Geochemistry. 52: 130-141. DOI: 10.1016/J.Orggeochem.2012.08.014 |
0.334 |
|
| 2012 |
Fulton JM, Arthur MA, Freeman KH. Subboreal aridity and scytonemin in the Holocene Black Sea Organic Geochemistry. 49: 47-55. DOI: 10.1016/J.Orggeochem.2012.05.008 |
0.788 |
|
| 2012 |
Dawson KS, Freeman KH, Macalady JL. Molecular characterization of core lipids from halophilic archaea grown under different salinity conditions Organic Geochemistry. 48: 1-8. DOI: 10.1016/J.Orggeochem.2012.04.003 |
0.318 |
|
| 2012 |
Diefendorf AF, Freeman KH, Wing SL. Distribution and carbon isotope patterns of diterpenoids and triterpenoids in modern temperate C 3 trees and their geochemical significance Geochimica Et Cosmochimica Acta. 85: 342-356. DOI: 10.1016/J.Gca.2012.02.016 |
0.772 |
|
| 2012 |
Medeiros PM, Sikes EL, Thomas B, Freeman KH. Flow discharge influences on input and transport of particulate and sedimentary organic carbon along a small temperate river Geochimica Et Cosmochimica Acta. 77: 317-334. DOI: 10.1016/J.Gca.2011.11.020 |
0.443 |
|
| 2011 |
Meyer KM, Macalady JL, Fulton JM, Kump LR, Schaperdoth I, Freeman KH. Carotenoid biomarkers as an imperfect reflection of the anoxygenic phototrophic community in meromictic Fayetteville Green Lake. Geobiology. 9: 321-9. PMID 21682840 DOI: 10.1111/J.1472-4669.2011.00285.X |
0.805 |
|
| 2011 |
Freeman KH, Mueller KE, Diefendorf AF, Wing SL, Koch PL. Clarifying the influence of water availability and plant types on carbon isotope discrimination by C3 plants. Proceedings of the National Academy of Sciences of the United States of America. 108: E59-60; author reply. PMID 21474782 DOI: 10.1073/Pnas.1102556108 |
0.756 |
|
| 2011 |
Cui Y, Kump LR, Ridgwell AJ, Charles AJ, Junium CK, Diefendorf AF, Freeman KH, Urban NM, Harding IC. Slow release of fossil carbon during the palaeocene-eocene thermal maximum Nature Geoscience. 4: 481-485. DOI: 10.1038/Ngeo1179 |
0.73 |
|
| 2011 |
Turich C, Freeman KH. Archaeal lipids record paleosalinity in hypersaline systems Organic Geochemistry. 42: 1147-1157. DOI: 10.1016/J.Orggeochem.2011.06.002 |
0.801 |
|
| 2011 |
Junium CK, Keely BJ, Freeman KH, Arthur MA. Chlorins in mid-Cretaceous black shales of the Demerara Rise: The oldest known occurrence Organic Geochemistry. 42: 856-859. DOI: 10.1016/J.Orggeochem.2011.04.002 |
0.599 |
|
| 2011 |
Diefendorf AF, Freeman KH, Wing SL, Graham HV. Production of n-alkyl lipids in living plants and implications for the geologic past Geochimica Et Cosmochimica Acta. 75: 7472-7485. DOI: 10.1016/J.Gca.2011.09.028 |
0.802 |
|
| 2011 |
McInerney FA, Helliker BR, Freeman KH. Hydrogen isotope ratios of leaf wax n-alkanes in grasses are insensitive to transpiration Geochimica Et Cosmochimica Acta. 75: 541-554. DOI: 10.1016/J.Gca.2010.10.022 |
0.399 |
|
| 2010 |
Mueller KE, Diefendorf AF, Freeman KH, Eissenstat DM. Appraising the roles of nutrient availability, global change, and functional traits during the angiosperm rise to dominance. Ecology Letters. 13: E1-6. PMID 20529099 DOI: 10.1111/J.1461-0248.2010.01455.X |
0.695 |
|
| 2010 |
Diefendorf AF, Mueller KE, Wing SL, Koch PL, Freeman KH. Global patterns in leaf 13C discrimination and implications for studies of past and future climate. Proceedings of the National Academy of Sciences of the United States of America. 107: 5738-43. PMID 20231481 DOI: 10.1073/Pnas.0910513107 |
0.754 |
|
| 2010 |
Polissar PJ, Freeman KH. Effects of aridity and vegetation on plant-wax δD in modern lake sediments Geochimica Et Cosmochimica Acta. 74: 5785-5797. DOI: 10.1016/J.Gca.2010.06.018 |
0.469 |
|
| 2010 |
Czaja AD, Johnson CM, Beard BL, Eigenbrode JL, Freeman KH, Yamaguchi KE. Iron and carbon isotope evidence for ecosystem and environmental diversity in the ∼ 2.7 to 2.5 Ga Hamersley Province, Western Australia Earth and Planetary Science Letters. 292: 170-180. DOI: 10.1016/J.Epsl.2010.01.032 |
0.481 |
|
| 2009 |
Polissar PJ, Fulton JM, Junium CK, Turich CC, Freeman KH. Measurement of 13C and 15N isotopic composition on nanomolar quantities of C and N. Analytical Chemistry. 81: 755-63. PMID 19072032 DOI: 10.1021/Ac801370C |
0.732 |
|
| 2009 |
Thomas B, Freeman KH, Arthur MA. Intramolecular carbon isotopic analysis of acetic acid by direct injection of aqueous solution Organic Geochemistry. 40: 195-200. DOI: 10.1016/J.Orggeochem.2008.10.011 |
0.666 |
|
| 2009 |
Polissar PJ, Freeman KH, Rowley DB, McInerney FA, Currie BS. Paleoaltimetry of the Tibetan Plateau from D/H ratios of lipid biomarkers Earth and Planetary Science Letters. 287: 64-76. DOI: 10.1016/J.Epsl.2009.07.037 |
0.517 |
|
| 2008 |
Moran JJ, House CH, Vrentas JM, Freeman KH. Methyl sulfide production by a novel carbon monoxide metabolism in Methanosarcina acetivorans Applied and Environmental Microbiology. 74: 540-542. PMID 18024677 DOI: 10.1128/Aem.01750-07 |
0.341 |
|
| 2008 |
Junium CK, Mawson DH, Arthur MA, Freeman KH, Keely BJ. Unexpected occurrence and significance of zinc alkyl porphyrins in Cenomanian–Turonian black shales of the Demerara Rise Organic Geochemistry. 39: 1081-1087. DOI: 10.1016/J.Orggeochem.2008.04.004 |
0.599 |
|
| 2008 |
Summons RE, Freeman KH, Grice K, Pancost RD. Where would we be without the isotopes? Organic Geochemistry. 39: 483-484. DOI: 10.1016/J.Orggeochem.2008.02.004 |
0.396 |
|
| 2008 |
Turich C, Freeman KH, Jones AD, Bruns MA, Conte M, Wakeham SG. Reply to the Comment by S. Schouten, M. van der Meer, E. Hopmans, and J.S. Sinninghe Damsté on "Lipids of marine Archaea: Patterns and provenance in the water column" Geochimica Et Cosmochimica Acta. 72: 5347-5349. DOI: 10.1016/J.Gca.2008.04.042 |
0.763 |
|
| 2008 |
Eigenbrode JL, Freeman KH, Summons RE. Methylhopane biomarker hydrocarbons in Hamersley Province sediments provide evidence for Neoarchean aerobiosis Earth and Planetary Science Letters. 273: 323-331. DOI: 10.1016/J.Epsl.2008.06.037 |
0.766 |
|
| 2007 |
Moran JJ, House CH, Thomas B, Freeman KH. Products of trace methane oxidation during nonmethyltrophic growth by Methanosarcina Journal of Geophysical Research: Biogeosciences. 112. DOI: 10.1029/2006Jg000268 |
0.306 |
|
| 2007 |
Wakeham SG, Amann R, Freeman KH, Hopmans EC, Jørgensen BB, Putnam IF, Schouten S, Sinninghe Damsté JS, Talbot HM, Woebken D. Microbial ecology of the stratified water column of the Black Sea as revealed by a comprehensive biomarker study Organic Geochemistry. 38: 2070-2097. DOI: 10.1016/J.Orggeochem.2007.08.003 |
0.357 |
|
| 2007 |
Turich C, Freeman KH, Bruns MA, Conte M, Jones AD, Wakeham SG. Lipids of marine Archaea: Patterns and provenance in the water-column and sediments Geochimica Et Cosmochimica Acta. 71: 3272-3291. DOI: 10.1016/J.Gca.2007.04.013 |
0.799 |
|
| 2007 |
SMITH F, WING S, FREEMAN K. Magnitude of the carbon isotope excursion at the Paleocene–Eocene thermal maximum: The role of plant community change Earth and Planetary Science Letters. 262: 50-65. DOI: 10.1016/J.Epsl.2007.07.021 |
0.506 |
|
| 2006 |
Eigenbrode JL, Freeman KH. Late Archean rise of aerobic microbial ecosystems. Proceedings of the National Academy of Sciences of the United States of America. 103: 15759-64. PMID 17043234 DOI: 10.1073/Pnas.0607540103 |
0.771 |
|
| 2006 |
Pedentchouk N, Freeman KH, Harris NB. Different response of δD values of n-alkanes, isoprenoids, and kerogen during thermal maturation Geochimica Et Cosmochimica Acta. 70: 2063-2072. DOI: 10.1016/J.Gca.2006.01.013 |
0.394 |
|
| 2006 |
Smith FA, Freeman KH. Influence of physiology and climate on δD of leaf wax n-alkanes from C3 and C4 grasses Geochimica Et Cosmochimica Acta. 70: 1172-1187. DOI: 10.1016/J.Gca.2005.11.006 |
0.423 |
|
| 2005 |
Wing SL, Harrington GJ, Smith FA, Bloch JI, Boyer DM, Freeman KH. Transient floral change and rapid global warming at the Paleocene-Eocene boundary. Science (New York, N.Y.). 310: 993-6. PMID 16284173 DOI: 10.1126/Science.1116913 |
0.411 |
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| 2005 |
Pagani M, Zachos JC, Freeman KH, Tipple B, Bohaty S. Marked decline in atmospheric carbon dioxide concentrations during the Paleogene. Science (New York, N.Y.). 309: 600-3. PMID 15961630 DOI: 10.1126/Science.1110063 |
0.821 |
|
| 2005 |
Felipe MA, Kubicki JD, Freeman KH. A mechanism for carbon isotope exchange between aqueous acetic acid and CO2/HCO3-: An ab initio study Organic Geochemistry. 36: 835-850. DOI: 10.1016/J.Orggeochem.2005.01.012 |
0.361 |
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| 2004 |
Pearson A, Huang Z, Ingalls AE, Romanek CS, Wiegel J, Freeman KH, Smittenberg RH, Zhang CL. Nonmarine crenarchaeol in Nevada hot springs Applied and Environmental Microbiology. 70: 5229-5237. PMID 15345404 DOI: 10.1128/Aem.70.9.5229-5237.2004 |
0.378 |
|
| 2004 |
Harris NB, Freeman KH, Pancost RD, White TS, Mitchell GD. The character and origin of lacustrine source rocks in the Lower Cretaceous synrift section, Congo Basin, west Africa Aapg Bulletin. 88: 1163-1184. DOI: 10.1306/02260403069 |
0.445 |
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| 2004 |
Pedentchouk N, Freeman KH, Harris NB, Clifford DJ, Grice K. Sources of alkylbenzenes in Lower Cretaceous lacustrine source rocks, West African rift basins Organic Geochemistry. 35: 33-45. DOI: 10.1016/J.Orggeochem.2003.04.001 |
0.476 |
|
| 2003 |
Sheridan PP, Freeman KH, Brenchley JE. Estimated minimal divergence times of the major bacterial and archaeal phyla Geomicrobiology Journal. 20: 1-14. DOI: 10.1080/01490450303891 |
0.321 |
|
| 2003 |
Ono S, Eigenbrode JL, Pavlov AA, Kharecha P, Rumble D, Kasting JF, Freeman KH. New insights into Archean sulfur cycle from mass-independent sulfur isotope records from the Hamersley Basin, Australia Earth and Planetary Science Letters. 213: 15-30. DOI: 10.1016/S0012-821X(03)00295-4 |
0.747 |
|
| 2002 |
Pagani M, Freeman KH, Ohkouchi N, Caldeira K. Comparison of water column [CO2aq] with sedimentary alkenone-based estimates: A test of the alkenone-CO2proxy Paleoceanography. 17: 21-1-21-12. DOI: 10.1029/2002Pa000756 |
0.639 |
|
| 2002 |
Dias RF, Freeman KH, Franks SG. Gas chromatography–pyrolysis–isotope ratio mass spectrometry: a new method for investigating intramolecular isotopic variation in low molecular weight organic acids Organic Geochemistry. 33: 161-168. DOI: 10.1016/S0146-6380(01)00141-3 |
0.807 |
|
| 2002 |
Joachimski M, Pancost R, Freeman K, Ostertag-Henning C, Buggisch W. Carbon isotope geochemistry of the Frasnian–Famennian transition Palaeogeography, Palaeoclimatology, Palaeoecology. 181: 91-109. DOI: 10.1016/S0031-0182(01)00474-6 |
0.482 |
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| 2002 |
Dias RF, Freeman KH, Lewan MD, Franks SG. δ13C of low-molecular-weight organic acids generated by the hydrous pyrolysis of oil-prone source rocks Geochimica Et Cosmochimica Acta. 66: 2755-2769. DOI: 10.1016/S0016-7037(02)00871-2 |
0.816 |
|
| 2002 |
Filley TR, Freeman KH, Wilkin RT, Hatcher PG. Biogeochemical controls on reaction of sedimentary organic matter and aqueous sulfides in holocene sediments of Mud Lake, Florida Geochimica Et Cosmochimica Acta. 66: 937-954. DOI: 10.1016/S0016-7037(01)00829-8 |
0.752 |
|
| 2001 |
Huang Y, Street-Perrott FA, Metcalfe SE, Brenner M, Moreland M, Freeman KH. Climate change as the dominant control on glacial-interglacial variations in C3 and C4 plant abundance. Science (New York, N.Y.). 293: 1647-51. PMID 11533488 DOI: 10.1126/Science.1060143 |
0.647 |
|
| 2001 |
Freeman KH. Isotopic Biogeochemistry of Marine Organic Carbon Reviews in Mineralogy and Geochemistry. 43: 579-605. DOI: 10.2138/Gsrmg.43.1.579 |
0.507 |
|
| 2001 |
Pavlov AA, Kasting JF, Eigenbrode JL, Freeman KH. Organic haze in Earth's early atmosphere: Source of low-13C Late Archean kerogens? Geology. 29: 1003. DOI: 10.1130/0091-7613(2001)029<1003:Ohiese>2.0.Co;2 |
0.741 |
|
| 2001 |
Rosell-Melé A, Bard E, Emeis KC, Grimalt JO, Müller P, Schneider R, Bouloubassi I, Epstein B, Fahl K, Fluegge A, Freeman K, Goñi M, Güntner U, Hartz D, Hellebust S, et al. Precision of the current methods to measure the alkenone proxy U37 K′ and absolute alkenone abundance in sediments: Results of an interlaboratory comparison study Geochemistry, Geophysics, Geosystems. 2. DOI: 10.1029/2000Gc000141 |
0.653 |
|
| 2001 |
Filley TR, Freeman KH, Bianchi TS, Baskaran M, Colarusso LA, Hatcher PG. An isotopic biogeochemical assessment of shifts in organic matter input to Holocene sediments from Mud Lake, Florida Organic Geochemistry. 32: 1153-1167. DOI: 10.1016/S0146-6380(01)00063-8 |
0.776 |
|
| 2001 |
Franks SG, Dias RF, Freeman KH, Boles JR, Holbal A, Fincannon AL, Jordanl ED. Carbon isotopic composition of organic acids in oil field waters, San Joaquin Basin, California, USA Geochimica Et Cosmochimica Acta. 65: 1301-1310. DOI: 10.1016/S0016-7037(00)00606-2 |
0.821 |
|
| 2001 |
Freeman K, Colarusso L. Molecular and isotopic records of C4 grassland expansion in the late miocene Geochimica Et Cosmochimica Acta. 65: 1439-1454. DOI: 10.1016/S0016-7037(00)00573-1 |
0.52 |
|
| 2001 |
Joachimski MM, Ostertag-Henning C, Pancost RD, Strauss H, Freeman KH, Littke R, Sinninghe Damsté JS, Racki G. Water column anoxia, enhanced productivity and concomitant changes in δ13C and δ34S across the Frasnian–Famennian boundary (Kowala — Holy Cross Mountains/Poland) Chemical Geology. 175: 109-131. DOI: 10.1016/S0009-2541(00)00365-X |
0.533 |
|
| 2000 |
Mandernack KW, Kinney CA, Coleman D, Huang YS, Freeman KH, Bogner J. The biogeochemical controls of N2O production and emission in landfill cover soils: the role of methanotrophs in the nitrogen cycle. Environmental Microbiology. 2: 298-309. PMID 11200431 DOI: 10.1046/J.1462-2920.2000.00106.X |
0.565 |
|
| 2000 |
Sachs JP, Schneider RR, Eglinton TI, Freeman KH, Ganssen G, McManus JF, Oppo DW. Alkenones as paleoceanographic proxies Geochemistry Geophysics Geosystems. 1. DOI: 10.1029/2000Gc000059 |
0.417 |
|
| 2000 |
Pagani M, Arthur MA, Freeman KH. Variations in Miocene phytoplankton growth rates in the Southwest Atlantic: Evidence for changes in ocean circulation Paleoceanography. 15: 486-496. DOI: 10.1029/1999Pa000484 |
0.737 |
|
| 2000 |
Huang Y, Freeman KH, Wilkin RT, Arthur MA, Jones A. Black Sea chemocline oscillations during the Holocene: molecular and isotopic studies of marginal sediments Organic Geochemistry. 31: 1525-1531. DOI: 10.1016/S0146-6380(00)00090-5 |
0.736 |
|
| 2000 |
Pagani M, Freeman KH, Arthur MA. Isotope analyses of molecular and total organic carbon from Miocene sediments Geochimica Et Cosmochimica Acta. 64: 37-49. DOI: 10.1016/S0016-7037(99)00151-9 |
0.77 |
|
| 1999 |
Bidigare RR, Fluegge A, Freeman KH, Hanson KL, Hayes JM, Hollander D, Jasper JP, King LL, Laws EA, Milder J, Millero FJ, Pancost R, Popp BN, Steinberg PA, Wakeham SG. Erratum: Consistent fractionation of13C in nature and in the laboratory: Growth-rate effects in some haptophyte algae (Global Biogeochemical Cycles (1997) 11:2 (279-292)) Global Biogeochemical Cycles. 13: 251-252. PMID 11542812 DOI: 10.1029/1998Gb900011 |
0.681 |
|
| 1999 |
Pancost RD, Freeman KH, Patzkowsky ME. Organic-matter source variation and the expression of a late Middle Ordovician carbon isotope excursion Geology. 27: 1015-1018. DOI: 10.1130/0091-7613(1999)027<1015:Omsvat>2.3.Co;2 |
0.494 |
|
| 1999 |
Huang Y, Freeman KH, Eglinton TI, Alayne Street-Perrott F. δ13C analyses of individual lignin phenols in Quaternary lake sediments: A novel proxy for deciphering past terrestrial vegetation changes Geology. 27: 471. DOI: 10.1130/0091-7613(1999)027<0471:Caoilp>2.3.Co;2 |
0.63 |
|
| 1999 |
Pagani M, Freeman KH, Arthur MA. Late miocene atmospheric CO2 concentrations and the expansion of C4 grasses Science. 285: 876-879. DOI: 10.1126/Science.285.5429.876 |
0.724 |
|
| 1999 |
Bidigare RR, Hanson KL, Buesseler KO, Wakeham SG, Freeman KH, Pancost RD, Millero FJ, Steinberg P, Popp BN, Latasa M, Landry MR, Laws EA. Iron-stimulated changes in13C fractionation and export by equatorial Pacific phytoplankton: Toward a paleogrowth rate proxy Paleoceanography. 14: 589-595. DOI: 10.1029/1999Pa900026 |
0.394 |
|
| 1999 |
Pagani M, Arthur MA, Freeman KH. Miocene evolution of atmospheric carbon dioxide Paleoceanography. 14: 273-292. DOI: 10.1029/1999Pa900006 |
0.747 |
|
| 1999 |
Pancost R, Freeman K, Wakeham S. Controls on the carbon-isotope compositions of compounds in Peru surface waters Organic Geochemistry. 30: 319-340. DOI: 10.1016/S0146-6380(99)00004-2 |
0.503 |
|
| 1998 |
Hayes JM, Freeman KH, Popp BN, Hoham CH. Compound-specific isotopic analyses: a novel tool for reconstruction of ancient biogeochemical processes. Organic Geochemistry. 16: 1115-28. PMID 11540919 DOI: 10.1016/0146-6380(90)90147-R |
0.628 |
|
| 1998 |
Pancost RD, Freeman KH, Patzkowsky ME, Wavrek DA, Collister JW. Molecular indicators of redox and marine photoautotroph composition in the late Middle Ordovician of Iowa, U.S.A. Organic Geochemistry. 29: 1649-1662. DOI: 10.1016/S0146-6380(98)00185-5 |
0.471 |
|
| 1997 |
Dias RF, Freeman KH. Carbon Isotope Analyses of Semivolatile Organic Compounds in Aqueous Media Using Solid-Phase Microextraction and Isotope Ratio Monitoring GC/MS. Analytical Chemistry. 69: 944-50. PMID 21639231 DOI: 10.1021/Ac960635+ |
0.8 |
|
| 1997 |
Bidigare RR, Fluegge A, Freeman KH, Hanson KL, Hayes JM, Hollander D, Jasper JP, King LL, Laws EA, Milder J, Millero FJ, Pancost R, Popp BN, Steinberg PA, Wakeham SG. Consistent fractionation of 13C in nature and in the laboratory: growth-rate effects in some haptophyte algae. Global Biogeochemical Cycles. 11: 279-92. PMID 11540616 DOI: 10.1029/96Gb03939 |
0.736 |
|
| 1997 |
Canuel EA, Freeman KH, Wakeham SG. Isotopic compositions of lipid biomarker compounds in estuarine plants and surface sediments Limnology and Oceanography. 42: 1570-1583. DOI: 10.4319/Lo.1997.42.7.1570 |
0.486 |
|
| 1997 |
Patzkowsky ME, Slupik LM, Arthur MA, Pancost RD, Freeman KH. Late Middle Ordovician environmental change and extinction: Harbinger of the late Ordovician or continuation of Cambrian patterns? Geology. 25: 911-914. DOI: 10.1130/0091-7613(1997)025<0911:Lmoeca>2.3.Co;2 |
0.676 |
|
| 1997 |
Freeman KH. MARINE GEOCHEMISTRY: A New Look at Old Carbon Science. 277: 777-778. DOI: 10.1126/Science.277.5327.777 |
0.474 |
|
| 1997 |
Filley TR, Filley RM, Eser S, Freeman KH. Compound-Specific Isotope Analyses of Products from Carbonization of a Fluid Catalytic Cracking Decant Oil Doped with13C-Enriched 4-Methyldibenzothiophene Energy & Fuels. 11: 637-646. DOI: 10.1021/Ef960150O |
0.657 |
|
| 1997 |
Pancost RD, Freeman KH, Wakeham SG, Robertson CY. Controls on carbon isotope fractionation by diatoms in the Peru upwelling region Geochimica Et Cosmochimica Acta. 61: 4983-4991. DOI: 10.1016/S0016-7037(97)00351-7 |
0.466 |
|
| 1996 |
Filley TR, Freeman KH, Hatcher PG. Carbon isotope relationships between sulfide-bound steroids and proposed functionalized lipid precursors in sediments from the Santa Barbara Basin, California Organic Geochemistry. 25: 367-377. DOI: 10.1016/S0146-6380(96)00142-8 |
0.715 |
|
| 1995 |
Merritt DA, Freeman KH, Ricci MP, Studley SA, Hayes JM. Performance and optimization of a combustion interface for isotope ratio monitoring gas chromatography/mass spectrometry Analytical Chemistry. 67: 2461-2473. PMID 11536720 DOI: 10.1021/Ac00110A022 |
0.559 |
|
| 1994 |
Freeman KH, Boreham CJ, Summons RE, Hayes JM. The effect of aromatization on the isotopic compositions of hydrocarbons during early diagenesis Organic Geochemistry. 21: 1037-1049. PMID 11539437 DOI: 10.1016/0146-6380(94)90067-1 |
0.582 |
|
| 1994 |
Freeman KH, Wakeham SG, Hayes JM. Predictive isotopic biogeochemistry: Hydrocarbons from anoxic marine basins Organic Geochemistry. 21: 629-644. PMID 11539435 DOI: 10.1016/0146-6380(94)90009-4 |
0.67 |
|
| 1994 |
Ricci MP, Merritt DA, Freeman KH, Hayes JM. Acquisition and processing of data for isotope-ratio-monitoring mass spectrometry Organic Geochemistry. 21: 561-571. PMID 11539433 DOI: 10.1016/0146-6380(94)90002-7 |
0.52 |
|
| 1993 |
Wakeham SG, Freeman KH, Pease TK, Hayes JM. A photoautotrophic source for lycopane in marine water columns. Geochimica Et Cosmochimica Acta. 57: 159-65. PMID 11537733 DOI: 10.1016/0016-7037(93)90476-D |
0.586 |
|
| 1992 |
Freeman KH, Hayes JM. Fractionation of carbon isotopes by phytoplankton and estimates of ancient CO2 levels Global Biogeochemical Cycles. 6: 185-198. PMID 11537848 DOI: 10.1029/92Gb00190 |
0.61 |
|
| 1992 |
Freeman KH, Wakeham SG. Variations in the distributions and isotopic composition of alkenones in Black Sea particles and sediments Organic Geochemistry. 19: 277-285. DOI: 10.1016/0146-6380(92)90043-W |
0.473 |
|
| 1991 |
Lichtfouse E, Freeman KH, Collister JW, Merritt DA. Enhanced resolution of organic compounds from sediments by isotopic gas chromatography—combustion—mass spectrometry Journal of Chromatography A. 585: 177-180. DOI: 10.1016/0021-9673(91)85074-P |
0.4 |
|
| 1990 |
Freeman KH, Hayes JM, Trendel JM, Albrecht P. Evidence from carbon isotope measurements for diverse origins of sedimentary hydrocarbons Nature. 343: 254-256. PMID 11536462 DOI: 10.1038/343254A0 |
0.65 |
|
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