Results 71 to 80 of about 92,659 (149)

Marine Cold Seep ANME‐2/SRB Consortia Produce Their Lipid Biomass From Inorganic Carbon

Environmental Microbiology, Volume 27, Issue 12, December 2025.
Lipid‐stable isotope probing (SIP) experiments in Astoria Canyon sediments revealed that both ANME‐2 and SRB primarily assimilate dissolved inorganic carbon (DIC or HCO3‐), not methane, into biomass. SRB‐specific lipids showed eightfold higher DI13C‐assimilation than ANME lipids, suggesting SRB directly assimilate DIC, while ANME assimilate an ...
Lennart Stock, Gunter Wegener, Yueqing Wang, Yannick Zander, Marcus Elvert   +4 more
wiley   +1 more source

Last Glacial Maximum and deglacial branched GDGT‐based palaeotemperature reconstruction from a subtropical Australian wetland

Journal of Quaternary Science, Volume 40, Issue 8, Page 1421-1436, November 2025.
ABSTRACT Future projections of climate change in the subtropics suggest warming and drying, while evidence from warm periods in the past shows increases in subtropical temperatures and precipitation. Eastern Australia is subject to interannual hydroclimate drivers and has experienced extreme flooding and droughts in recent years.
Joan Macalalad, Kevin Welsh, Harald Hofmann, Geraldine Jacobsen, Zhenyu Ni, Enlou Zhang   +5 more
wiley   +1 more source

Oxygen Depletion in Lake Waters May Skew brGDGT‐Inferred Temperatures by More Than 10°C

Geophysical Research Letters, Volume 52, Issue 15, 16 August 2025.
Abstract Branched glycerol dialkyl glycerol tetraether (brGDGT) paleothermometry is an important tool for paleoclimate research. Oxygen availability has been suggested to skew brGDGT‐inferred temperatures, but the effect is poorly constrained. Here, we examine the influence of dissolved oxygen (DO) on brGDGTs in lacustrine water filtrates. By examining
Jonathan H. Raberg, Gregory A. de Wet, Áslaug Geirsdóttir, Julio Sepúlveda, Gifford H. Miller   +4 more
wiley   +1 more source

Compositions of branched glycerol dialkyl glycerol tetraethers (GDGTs) in sediment samples from Bullenmoor peat bog, Northern Germany

, 2010
Two types of intact branched glycerol dialkyl glycerol tetraethers (GDGTs) were detected in peat bog samples from Bullenmoor, Northern Germany. Glucuronosyl and glucosyl branched GDGTs comprise on average ca.
Gerard J M Versteegh (7886111), Kai-Uwe Hinrichs (6960101), Aimee Gillespie (7963490), Versteegh, Gerard J M, Hinrichs, Kai-Uwe, Arne Leider (6969833), Xiao-Lei Liu (6974528), Leider, Arne, Gillespie, Aimee, Liu, Xiao-Lei, Gröger, Jens, Jens Gröger (7946405)   +11 more
core   +1 more source

Late Holocene Human Impact on Tropical Soil Erosion in the Maritime Continent

Geophysical Research Letters, Volume 52, Issue 15, 16 August 2025.
Abstract Human activities have profoundly modified the fluxes in the global sediment cycle. However, the anthropogenic forcing on soil erosion beyond instrumental records or historical documentation is largely unknown. Here we analyze markers for low‐intensity fires and soil erosion in East Java over the past 5,000 years.
Yanming Ruan, Mahyar Mohtadi, Lydie M. Dupont, Dierk Hebbeln, Sander van der Kaars, Wenwen Chen, Ellen C. Hopmans, Stefan Schouten, Matthias Prange, Jens Hefter, Gesine Mollenhauer, Enno Schefuß   +11 more
wiley   +1 more source

Core and intact polar glycerol dialkyl glycerol tetraethers (GDGTs) in Sand Pond, Warwick, Rhode Island (USA): Insights into the origin of lacustrine GDGTs

, 2012
Branched and isoprenoidal glycerol dialkyl glycerol tetraethers (GDGTs) are abundant in lake sediments and have potential use for determining past changes in climate and limnology.
Hopmans, E.C., Pitcher, A., Tierney, J.E., Schouten, S., Sinninghe Damsté, J.S., Stefan Schouten, Jessica E. Tierney, Jaap S. Sinninghe Damsté, Angela Pitcher, Ellen C. Hopmans   +9 more
core   +1 more source

High‐Resolution Lake Deposits Record Temperature Variability During the Middle Eocene Greenhouse in Central Europe

Paleoceanography and Paleoclimatology, Volume 40, Issue 7, July 2025.
Abstract High‐resolution continental temperature records from geological archives are crucial in order to evaluate temperature dynamics under fundamentally different climate conditions than today. Particularly the warm early to middle Eocene (∼56–40 million years ago) has become the focus of paleoclimate studies with the intention of quantifying ...
Clemens Schmitt, Iuliana Vasiliev, Niels Meijer, Andreas Mulch   +3 more
wiley   +1 more source

(Table 1) Bulk organic matter and GDGT analyses from riverbed sediments and river SPM samples

, 2012
In order to trace the transport of soil organic carbon (OC) in the lower Amazon basin, we investigated the distributions of crenarchaeol and branched glycerol dialkyl glycerol tetraethers (GDGTs) by analyzing riverbed sediments and river suspended ...
Zell, Claudia, Marcela A P Pérez (8020685), Weijers, Johan W H, Kim, Jung-Hyun, Mortillaro, Jean-Michel, Johan W H Weijers (6980885), Meziane, Tarik, Jaap S Sinninghe Damsté (6885257), Jung-Hyun Kim (6976445), Jean-Michel Mortillaro (130970), Patricia Moreira-Turcq (8020682), Moreira-Turcq, Patricia, Sinninghe Damsté, Jaap S, Claudia Zell (8010755), Tarik Meziane (8020691), Pérez, Marcela A P, Abril, Gwenaël, Gwenaël Abril (8020688)   +17 more
core   +1 more source

Hydroclimate and Ecosystem Changes in the Colorado Rocky Mountains Since the Last Glacial Maximum

Paleoceanography and Paleoclimatology, Volume 40, Issue 7, July 2025.
Abstract During the Last Glacial Maximum, wetter and cooler conditions drove expanded pluvial lake systems throughout the southwestern United States. Here, we aim to understand the drivers of these hydroclimate changes using new biomarker records from Cumbres Bog, a high‐elevation fen (3,050 m) in the San Juan Mountain Range in the southern Rocky ...
Victoria L. Todd, Timothy M. Shanahan, Bradley G. Johnson   +2 more
wiley   +1 more source

Identification and distribution of intact polar branched tetraether lipids in peat and soil

, 2011
Branched glycerol dialkyl glycerol tetraether lipids (GDGTs) are membrane lipids of soil bacteria that occur ubiquitously in soil, but their occurrence as intact polar lipids (IPLs) has not been well studied.
Hopmans, E.C., W. Irene C. Rijpstra, Rijpstra, W.I.C., Stefan Schouten, Anchélique Mets, Schouten, S., Organic geochemistry, Jaap S. Sinninghe Damsté, Peterse, F., Sinninghe Damsté, J.S., Mets, A., Francien Peterse, Ellen C. Hopmans, Research Programme in Earth Sciences Utrecht (DES / IVAU), non-UU output of (former) DES-UU members   +14 more
core   +1 more source