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Environmental controls on bacteriohopanepolyol profiles of benthic microbial mats from Lake Fryxell, Antarctica.

Matys ED, Mackey T, Grettenberger C, Mueller E, Jungblut A, Sumner DY, Hawes I, Summons RE.

Geobiology. 2019 Sep;17(5):551-563. doi: 10.1111/gbi.12353. Epub 2019 Jul 19.


Recovery of Fatty Acids from Mineralogic Mars Analogs by TMAH Thermochemolysis for the Sample Analysis at Mars Wet Chemistry Experiment on the Curiosity Rover.

Williams AJ, Eigenbrode J, Floyd M, Wilhelm MB, O'Reilly S, Johnson SS, Craft KL, Knudson CA, Andrejkovičová S, Lewis JMT, Buch A, Glavin DP, Freissinet C, Williams RH, Szopa C, Millan M, Summons RE, McAdam A, Benison K, Navarro-González R, Malespin C, Mahaffy PR.

Astrobiology. 2019 Apr;19(4):522-546. doi: 10.1089/ast.2018.1819. Epub 2019 Mar 14.


Organic geochemical approaches to understanding early life.

Alleon J, Summons RE.

Free Radic Biol Med. 2019 Mar 9. pii: S0891-5849(18)32497-3. doi: 10.1016/j.freeradbiomed.2019.03.005. [Epub ahead of print] Review.


Bacteriohopanepolyols across environmental gradients in Lake Vanda, Antarctica.

Matys ED, Mackey T, Grettenberger C, Mueller E, Sumner DY, Hawes I, Summons RE.

Geobiology. 2019 May;17(3):308-319. doi: 10.1111/gbi.12335. Epub 2019 Feb 1.


Calditol-linked membrane lipids are required for acid tolerance in Sulfolobus acidocaldarius.

Zeng Z, Liu XL, Wei JH, Summons RE, Welander PV.

Proc Natl Acad Sci U S A. 2018 Dec 18;115(51):12932-12937. doi: 10.1073/pnas.1814048115. Epub 2018 Dec 5.


Microbially influenced formation of Neoarchean ooids.

Flannery DT, Allwood AC, Hodyss R, Summons RE, Tuite M, Walter MR, Williford KH.

Geobiology. 2019 Mar;17(2):151-160. doi: 10.1111/gbi.12321. Epub 2018 Nov 18.


Demosponge steroid biomarker 26-methylstigmastane provides evidence for Neoproterozoic animals.

Zumberge JA, Love GD, Cárdenas P, Sperling EA, Gunasekera S, Rohrssen M, Grosjean E, Grotzinger JP, Summons RE.

Nat Ecol Evol. 2018 Nov;2(11):1709-1714. doi: 10.1038/s41559-018-0676-2. Epub 2018 Oct 15.


Chemical clues to the earliest animal fossils.

Summons RE, Erwin DH.

Science. 2018 Sep 21;361(6408):1198-1199. doi: 10.1126/science.aau9710. No abstract available.


Constraints on the Metabolic Activity of Microorganisms in Atacama Surface Soils Inferred from Refractory Biomarkers: Implications for Martian Habitability and Biomarker Detection.

Wilhelm MB, Davila AF, Parenteau MN, Jahnke LL, Abate M, Cooper G, Kelly ET, Parro García V, Villadangos MG, Blanco Y, Glass B, Wray JJ, Eigenbrode JL, Summons RE, Warren-Rhodes K.

Astrobiology. 2018 Jul;18(7):955-966. doi: 10.1089/ast.2017.1705.


A Field Guide to Finding Fossils on Mars.

McMahon S, Bosak T, Grotzinger JP, Milliken RE, Summons RE, Daye M, Newman SA, Fraeman A, Williford KH, Briggs DEG.

J Geophys Res Planets. 2018 May;123(5):1012-1040. doi: 10.1029/2017JE005478. Epub 2018 May 24. Review.


Organic matter preserved in 3-billion-year-old mudstones at Gale crater, Mars.

Eigenbrode JL, Summons RE, Steele A, Freissinet C, Millan M, Navarro-González R, Sutter B, McAdam AC, Franz HB, Glavin DP, Archer PD Jr, Mahaffy PR, Conrad PG, Hurowitz JA, Grotzinger JP, Gupta S, Ming DW, Sumner DY, Szopa C, Malespin C, Buch A, Coll P.

Science. 2018 Jun 8;360(6393):1096-1101. doi: 10.1126/science.aas9185.


The "Dirty Ice" of the McMurdo Ice Shelf: Analogues for biological oases during the Cryogenian.

Hawes I, Jungblut AD, Matys ED, Summons RE.

Geobiology. 2018 Jul;16(4):369-377. doi: 10.1111/gbi.12280. Epub 2018 Mar 12.


Nitrogen fixation sustained productivity in the wake of the Palaeoproterozoic Great Oxygenation Event.

Luo G, Junium CK, Izon G, Ono S, Beukes NJ, Algeo TJ, Cui Y, Xie S, Summons RE.

Nat Commun. 2018 Mar 7;9(1):978. doi: 10.1038/s41467-018-03361-2.


Picomolar-scale compound-specific isotope analyses.

Baczynski AA, Polissar PJ, Juchelka D, Schwieters J, Hilkert A, Summons RE, Freeman KH.

Rapid Commun Mass Spectrom. 2018 May 15;32(9):730-738. doi: 10.1002/rcm.8084.


Acetoclastic Methanosaeta are dominant methanogens in organic-rich Antarctic marine sediments.

Carr SA, Schubotz F, Dunbar RB, Mills CT, Dias R, Summons RE, Mandernack KW.

ISME J. 2018 Feb;12(2):330-342. doi: 10.1038/ismej.2017.150. Epub 2017 Oct 17.


Microbial communities and organic biomarkers in a Proterozoic-analog sinkhole.

Hamilton TL, Welander PV, Albrecht HL, Fulton JM, Schaperdoth I, Bird LR, Summons RE, Freeman KH, Macalady JL.

Geobiology. 2017 Nov;15(6):784-797. doi: 10.1111/gbi.12252.


Lipidomics of the sea sponge Amphimedon queenslandica and implication for biomarker geochemistry.

Gold DA, O'Reilly SS, Watson J, Degnan BM, Degnan SM, Krömer JO, Summons RE.

Geobiology. 2017 Nov;15(6):836-843. doi: 10.1111/gbi.12253. Epub 2017 Aug 28.


An Exceptionally Preserved Three-Dimensional Armored Dinosaur Reveals Insights into Coloration and Cretaceous Predator-Prey Dynamics.

Brown CM, Henderson DM, Vinther J, Fletcher I, Sistiaga A, Herrera J, Summons RE.

Curr Biol. 2017 Aug 21;27(16):2514-2521.e3. doi: 10.1016/j.cub.2017.06.071. Epub 2017 Aug 3.


Bacteriohopanepolyols along redox gradients in the Humboldt Current System off northern Chile.

Matys ED, Sepúlveda J, Pantoja S, Lange CB, Caniupán M, Lamy F, Summons RE.

Geobiology. 2017 Nov;15(6):844-857. doi: 10.1111/gbi.12250. Epub 2017 Aug 3.


Lack of Methylated Hopanoids Renders the Cyanobacterium Nostoc punctiforme Sensitive to Osmotic and pH Stress.

Garby TJ, Matys ED, Ongley SE, Salih A, Larkum AWD, Walter MR, Summons RE, Neilan BA.

Appl Environ Microbiol. 2017 Jun 16;83(13). pii: e00777-17. doi: 10.1128/AEM.00777-17. Print 2017 Jul 1.


Paleoproterozoic sterol biosynthesis and the rise of oxygen.

Gold DA, Caron A, Fournier GP, Summons RE.

Nature. 2017 Mar 16;543(7645):420-423. doi: 10.1038/nature21412. Epub 2017 Mar 6.


Xeropreservation of functionalized lipid biomarkers in hyperarid soils in the Atacama Desert.

Wilhelm MB, Davila AF, Eigenbrode JL, Parenteau MN, Jahnke LL, Liu XL, Summons RE, Wray JJ, Stamos BN, O'Reilly SS, Williams A.

Org Geochem. 2017 Jan;103:97-104. doi: 10.1016/j.orggeochem.2016.10.015. Epub 2016 Oct 29.


System-Wide Adaptations of Desulfovibrio alaskensis G20 to Phosphate-Limited Conditions.

Bosak T, Schubotz F, de Santiago-Torio A, Kuehl JV, Carlson HK, Watson N, Daye M, Summons RE, Arkin AP, Deutschbauer AM.

PLoS One. 2016 Dec 28;11(12):e0168719. doi: 10.1371/journal.pone.0168719. eCollection 2016.


Rapid oxygenation of Earth's atmosphere 2.33 billion years ago.

Luo G, Ono S, Beukes NJ, Wang DT, Xie S, Summons RE.

Sci Adv. 2016 May 13;2(5):e1600134. doi: 10.1126/sciadv.1600134. eCollection 2016 May.


Molecular biosignatures reveal common benthic microbial sources of organic matter in ooids and grapestones from Pigeon Cay, The Bahamas.

O'Reilly SS, Mariotti G, Winter AR, Newman SA, Matys ED, McDermott F, Pruss SB, Bosak T, Summons RE, Klepac-Ceraj V.

Geobiology. 2017 Jan;15(1):112-130. doi: 10.1111/gbi.12196. Epub 2016 Jul 4.


Sterol and genomic analyses validate the sponge biomarker hypothesis.

Gold DA, Grabenstatter J, de Mendoza A, Riesgo A, Ruiz-Trillo I, Summons RE.

Proc Natl Acad Sci U S A. 2016 Mar 8;113(10):2684-9. doi: 10.1073/pnas.1512614113. Epub 2016 Feb 22.


Novel archaeal tetraether lipids with a cyclohexyl ring identified in Fayetteville Green Lake, NY, and other sulfidic lacustrine settings.

Liu XL, De Santiago Torio A, Bosak T, Summons RE.

Rapid Commun Mass Spectrom. 2016 May 30;30(10):1197-1205. doi: 10.1002/rcm.7549.


Organic molecules in the Sheepbed Mudstone, Gale Crater, Mars.

Freissinet C, Glavin DP, Mahaffy PR, Miller KE, Eigenbrode JL, Summons RE, Brunner AE, Buch A, Szopa C, Archer PD, Franz HB, Atreya SK, Brinckerhoff WB, Cabane M, Coll P, Conrad PG, Des Marais DJ, Dworkin JP, Fairén AG, François P, Grotzinger JP, Kashyap S, Ten Kate IL, Leshin LA, Malespin CA, Martin MG, Martin-Torres FJ, McAdam AC, Ming DW, Navarro-González R, Pavlov AA, Prats BD, Squyres SW, Steele A, Stern JC, Sumner DY, Sutter B, Zorzano MP.

J Geophys Res Planets. 2015 Mar;120(3):495-514. Epub 2015 Mar 21.


Carbon and sulfur isotopic signatures of ancient life and environment at the microbial scale: Neoarchean shales and carbonates.

Williford KH, Ushikubo T, Lepot K, Kitajima K, Hallmann C, Spicuzza MJ, Kozdon R, Eigenbrode JL, Summons RE, Valley JW.

Geobiology. 2016 Mar;14(2):105-28. doi: 10.1111/gbi.12163. Epub 2015 Oct 24.


A Geomimetic Approach to the Formation and Identification of Fossil Sterane Biomarkers in Crude Oil: 18-nor-D-homo-Androstane and 5α,14β-Androstane.

Bender M, Schmidtmann M, Summons RE, Rullkötter J, Christoffers J.

Chemistry. 2015 Aug 24;21(35):12501-8. doi: 10.1002/chem.201502148. Epub 2015 Jul 1.


New Insights into the Evolution of the Human Diet from Faecal Biomarker Analysis in Wild Chimpanzee and Gorilla Faeces.

Sistiaga A, Wrangham R, Rothman JM, Summons RE.

PLoS One. 2015 Jun 10;10(6):e0128931. doi: 10.1371/journal.pone.0128931. eCollection 2015.


OlsG (Sinac_1600) Is an Ornithine Lipid N-Methyltransferase from the Planctomycete Singulisphaera acidiphila.

Escobedo-Hinojosa WI, Vences-Guzmán MÁ, Schubotz F, Sandoval-Calderón M, Summons RE, López-Lara IM, Geiger O, Sohlenkamp C.

J Biol Chem. 2015 Jun 12;290(24):15102-11. doi: 10.1074/jbc.M115.639575. Epub 2015 Apr 29.


Reappraisal of hydrocarbon biomarkers in Archean rocks.

French KL, Hallmann C, Hope JM, Schoon PL, Zumberge JA, Hoshino Y, Peters CA, George SC, Love GD, Brocks JJ, Buick R, Summons RE.

Proc Natl Acad Sci U S A. 2015 May 12;112(19):5915-20. doi: 10.1073/pnas.1419563112. Epub 2015 Apr 27.


Stable isotope labeling confirms mixotrophic nature of streamer biofilm communities at alkaline hot springs.

Schubotz F, Hays LE, Meyer-Dombard DR, Gillespie A, Shock EL, Summons RE.

Front Microbiol. 2015 Feb 5;6:42. doi: 10.3389/fmicb.2015.00042. eCollection 2015.


Assessing the distribution of sedimentary C40 carotenoids through time.

French KL, Rocher D, Zumberge JE, Summons RE.

Geobiology. 2015 Mar;13(2):139-51. doi: 10.1111/gbi.12126. Epub 2015 Jan 28.


Methane Oxidation and Molecular Characterization of Methanotrophs from a Former Mercury Mine Impoundment.

Baesman SM, Miller LG, Wei JH, Cho Y, Matys ED, Summons RE, Welander PV, Oremland RS.

Microorganisms. 2015 Jun 23;3(2):290-309. doi: 10.3390/microorganisms3020290.


Planning considerations related to the organic contamination of Martian samples and implications for the Mars 2020 Rover.

Summons RE, Sessions AL, Allwood AC, Barton HA, Beaty DW, Blakkolb B, Canham J, Clark BC, Dworkin JP, Lin Y, Mathies R, Milkovich SM, Steele A.

Astrobiology. 2014 Dec;14(12):969-1027. doi: 10.1089/ast.2014.1244. No abstract available.


Reply to Schouten et al.: Marine Group II planktonic Euryarchaeota are significant contributors to tetraether lipids in the ocean.

Lincoln SA, Wai B, Eppley JM, Church MJ, Summons RE, DeLong EF.

Proc Natl Acad Sci U S A. 2014 Oct 14;111(41):E4286. doi: 10.1073/pnas.1416736111. Epub 2014 Sep 19. No abstract available.


The Neanderthal meal: a new perspective using faecal biomarkers.

Sistiaga A, Mallol C, Galván B, Summons RE.

PLoS One. 2014 Jun 25;9(6):e101045. doi: 10.1371/journal.pone.0101045. eCollection 2014.


Planktonic Euryarchaeota are a significant source of archaeal tetraether lipids in the ocean.

Lincoln SA, Wai B, Eppley JM, Church MJ, Summons RE, DeLong EF.

Proc Natl Acad Sci U S A. 2014 Jul 8;111(27):9858-63. doi: 10.1073/pnas.1409439111. Epub 2014 Jun 19.


Elucidation of the Burkholderia cenocepacia hopanoid biosynthesis pathway uncovers functions for conserved proteins in hopanoid-producing bacteria.

Schmerk CL, Welander PV, Hamad MA, Bain KL, Bernards MA, Summons RE, Valvano MA.

Environ Microbiol. 2015 Mar;17(3):735-50. doi: 10.1111/1462-2920.12509. Epub 2014 Jun 24.


Methanogenic burst in the end-Permian carbon cycle.

Rothman DH, Fournier GP, French KL, Alm EJ, Boyle EA, Cao C, Summons RE.

Proc Natl Acad Sci U S A. 2014 Apr 15;111(15):5462-7. doi: 10.1073/pnas.1318106111. Epub 2014 Mar 31.


Ancient biomolecules: their origins, fossilization, and role in revealing the history of life.

Briggs DE, Summons RE.

Bioessays. 2014 May;36(5):482-90. doi: 10.1002/bies.201400010. Epub 2014 Mar 13.


Identification and quantification of polyfunctionalized hopanoids by high temperature gas chromatography-mass spectrometry.

Sessions AL, Zhang L, Welander PV, Doughty D, Summons RE, Newman DK.

Org Geochem. 2013 Mar;56:120-130.


Canopy flow analysis reveals the advantage of size in the oldest communities of multicellular eukaryotes.

Ghisalberti M, Gold DA, Laflamme M, Clapham ME, Narbonne GM, Summons RE, Johnston DT, Jacobs DK.

Curr Biol. 2014 Feb 3;24(3):305-9. doi: 10.1016/j.cub.2013.12.017. Epub 2014 Jan 23.


Bacterial vesicles in marine ecosystems.

Biller SJ, Schubotz F, Roggensack SE, Thompson AW, Summons RE, Chisholm SW.

Science. 2014 Jan 10;343(6167):183-6. doi: 10.1126/science.1243457.


Molecular and lipid biomarker analysis of a gypsum-hosted endoevaporitic microbial community.

Jahnke LL, Turk-Kubo KA, N Parenteau M, Green SJ, Kubo MD, Vogel M, Summons RE, Des Marais DJ.

Geobiology. 2014 Jan;12(1):62-82. doi: 10.1111/gbi.12068.


Volatile and organic compositions of sedimentary rocks in Yellowknife Bay, Gale crater, Mars.

Ming DW, Archer PD Jr, Glavin DP, Eigenbrode JL, Franz HB, Sutter B, Brunner AE, Stern JC, Freissinet C, McAdam AC, Mahaffy PR, Cabane M, Coll P, Campbell JL, Atreya SK, Niles PB, Bell JF 3rd, Bish DL, Brinckerhoff WB, Buch A, Conrad PG, Des Marais DJ, Ehlmann BL, Fairén AG, Farley K, Flesch GJ, Francois P, Gellert R, Grant JA, Grotzinger JP, Gupta S, Herkenhoff KE, Hurowitz JA, Leshin LA, Lewis KW, McLennan SM, Miller KE, Moersch J, Morris RV, Navarro-González R, Pavlov AA, Perrett GM, Pradler I, Squyres SW, Summons RE, Steele A, Stolper EM, Sumner DY, Szopa C, Teinturier S, Trainer MG, Treiman AH, Vaniman DT, Vasavada AR, Webster CR, Wray JJ, Yingst RA; MSL Science Team.

Science. 2014 Jan 24;343(6169):1245267. doi: 10.1126/science.1245267. Epub 2013 Dec 9.


Diverse capacity for 2-methylhopanoid production correlates with a specific ecological niche.

Ricci JN, Coleman ML, Welander PV, Sessions AL, Summons RE, Spear JR, Newman DK.

ISME J. 2014 Mar;8(3):675-84. doi: 10.1038/ismej.2013.191. Epub 2013 Oct 24.


Volatile, isotope, and organic analysis of martian fines with the Mars Curiosity rover.

Leshin LA, Mahaffy PR, Webster CR, Cabane M, Coll P, Conrad PG, Archer PD Jr, Atreya SK, Brunner AE, Buch A, Eigenbrode JL, Flesch GJ, Franz HB, Freissinet C, Glavin DP, McAdam AC, Miller KE, Ming DW, Morris RV, Navarro-González R, Niles PB, Owen T, Pepin RO, Squyres S, Steele A, Stern JC, Summons RE, Sumner DY, Sutter B, Szopa C, Teinturier S, Trainer MG, Wray JJ, Grotzinger JP; MSL Science Team.

Science. 2013 Sep 27;341(6153):1238937. doi: 10.1126/science.1238937.


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