Results 81 to 90 of about 92,659 (149)

Distribution of Glycerol Dialkyl Glycerol Tetraethers (GDGTs) in Carbonate-Type and Sulfate-Type Lacustrine Sediments: Insight into the Influence of Ionic Composition on GDGTs

, 2022
The distribution of glycerol dialkyl glycerol tetraethers (GDGTs) in carbonate-type and sulfate-type saline lacustrine sediments from the Ordos Plateau in China is investigated to explore the influence of ionic composition on GDGTs.
Xilong Zhang, Yongxin Chen, Yanqing Xia, Gaoqing Zhang, Shengyin Zhang, Wen Qi, Yu Pei, Xuan Fang   +7 more
core   +1 more source

A Nutrient Effect on the TEX86 Paleotemperature Proxy

Geophysical Research Letters, Volume 52, Issue 12, 28 June 2025.
Abstract The TEX86 ${\text{TEX}}_{86}$ paleotemperature proxy is widely used to reconstruct ocean surface temperatures over the past 100 million years. However, archaeal culture experiments show that nutrient stress elevates TEX86 ${\text{TEX}}_{86}$ values by increasing glycerol dialkyl glycerol tetraether (GDGT) cyclization. Here, we demonstrate that
Ronnakrit Rattanasriampaipong, Jessica E. Tierney, Jordan T. Abell, Lauren D. Gilmore   +3 more
wiley   +1 more source

(Table 1) Methylation index (MBT) and cyclization ratio (CBT) of branched GDGTs, and mean annual air temperature (MAAT) and pH values from MBT and CBT indices of Bullenmoor peat bog, Northern Germany

, 2010
(Table 1) Methylation index (MBT) and cyclization ratio (CBT) of branched GDGTs, and mean annual air temperature (MAAT) and pH values from MBT and CBT indices of Bullenmoor peat bog, Northern ...
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

Archaeal community composition in Holocene methane pockmarks of the Gdańsk Basin (Baltic Sea, Poland): insights from tetraether lipids and 16S rRNA analysis [PDF]

Biogeosciences
Methane pockmarks and shallow gas systems are prominent geomorphological features in the Baltic Sea that act as hotspots of microbial activity. In the Gdańsk Basin, pockmarks vary in gas-seepage intensity and in the extent of freshened porewater ...
I. De Mey-Śnieżyńska, M. Słowakiewicz, F. Peterse, A. Brodecka-Goluch, A. Borkowski, K. Łukawska-Matuszewska   +5 more
doaj   +1 more source

The Branched GDGT Isomer Ratio Refines Lacustrine Paleotemperature Estimates

Geochemistry, Geophysics, Geosystems
Branched glycerol dialkyl glycerol tetraethers (brGDGTs) are membrane‐spanning lipids synthesized by bacteria in numerous substrates. The degree of methylation of the five methyl brGDGTs in both soils and lake sediments, described by the MBT′5Me index ...
Joseph B. Novak, James M. Russell, Emma R. Lindemuth, Alexander A. Prokopenko, Lina Pérez‐Angel, Boyang Zhao, George E. A. Swann, Pratigya J. Polissar   +7 more
doaj   +1 more source

(Table 3) General properties, branched GDGT concentrations and proxy values for marine surface sediments in Kongsfjorden and Krossfjorden

, 2009
Branched glycerol dialkyl glycerol tetraethers (GDGTs) are membrane lipids of unknown bacteria that are ubiquitous in soil and peat. Two indices based on the distribution of these lipids in soils, the Cyclization of Branched Tetraethers (CBT) and the ...
Peterse, Francien, Schouten, Stefan, Francien Peterse (6970094), Kim, Jung-Hyun, Dorthe Klitgaard-Kristensen (6964655), Klitgaard-Kristensen, Dorthe, Jaap S Sinninghe Damsté (6885257), Jung-Hyun Kim (6976445), Koç, Nalân, Stefan Schouten (6885260), Sinninghe Damsté, Jaap S, Nalân Koç (6964682)   +11 more
core   +1 more source

Combination of branched GDGTs and testate amoebae for the reconstruction of past climate change in a French peatland

, 2013
International audiencePeatlands are important archives for the reconstruction of past environmental changes because of their high rates of peat accumulation due to the low rate of plant litter decomposition. Branched glycerol dialkyl glycerol tetraethers
Jassey, Vincent E. J., Buttler, Alexandre, Derenne, Sylvie, Payne, Richard, Mitchell, Edward A. D., Gilbert, Daniel, Huguet, Arnaud, Laggoun-Défarge, Fatima, Delarue, Frédéric   +8 more
core   +4 more sources

Branched tetraether membrane lipids associated with rhizoliths in loess: Rhizomicrobial overprinting of initial biomarker record

, 2012
Loess–palaeosol sequences are considered important terrestrial archives for studying Quaternary climate. Recent studies have shown that calcified roots (rhizoliths) can be significantly younger than surrounding terrestrial sediment (loess) and that loess
Fosse, Céline, Guido L.B. Wiesenberg, Sylvie Derenne, Céline Fosse, Wiesenberg, Guido L. B., Derenne, Sylvie, Martina Gocke, Huguet, Arnaud, Gocke, Martina, Arnaud Huguet, Wiesenberg, Guido L B   +10 more
core   +1 more source

Fractional abundances of isoprenoidal and branched glycerol dialkyl glycerol tetraethers (GDGTs) from DSDP Site 94-608

These files pertain to biomarker data data from Ocean Drilling Program (ODP) Site 982 and Deep Sea Drilling Project (DSDP) Site 608. For each site, the fractional abundances of isoprenoidal and branched glycerol dialkyl glycerol tetraethers (GDGTs) are ...
Super, James R
core   +1 more source

Fractional abundances of isoprenoidal and branched glycerol dialkyl glycerol tetraethers (GDGTs) from different holes of ODP Site 162-982

These files pertain to biomarker data data from Ocean Drilling Program (ODP) Site 982 and Deep Sea Drilling Project (DSDP) Site 608. For each site, the fractional abundances of isoprenoidal and branched glycerol dialkyl glycerol tetraethers (GDGTs) are ...
Super, James R
core   +1 more source