Results 91 to 100 of about 1,034,422 (264)

Interannual and (multi-)decadal variability in the sedimentary BIT index of Lake Challa, East Africa, over the past 2200 years: assessment of the precipitation proxy [PDF]

, 2016
The branched vs. isoprenoid tetraether (BIT) index is based on the relative abundance of branched tetraether lipids (brGDGTs) and the isoprenoidal GDGT crenarchaeol.
Blaauw, M., Buckles, L.K., Cocquyt, C., Sinninghe Damsté, J.S., Verschuren, D., Weijers, J.W.H.   +5 more
core   +3 more sources

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

An offset in TEX86 values between interbedded lithologies: Implications for sea-surface temperature reconstructions [PDF]

, 2016
This is the author accepted manuscript. The final version is available from Elsevier via the DOI in this record.The TEX86 (TetraEther indeX of tetraethers consisting of 86 carbon atoms) sea-surface temperature (SST) proxy is based on the distribution of ...
Bown, PR, Littler, K, Robinson, SA
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

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

Planktonic Lipidome Responses to Aeolian Dust Input in Low-Biomass Oligotrophic Marine Mesocosms

Frontiers in Marine Science, 2017
The effect and fate of dry atmospheric deposition on nutrient-starved plankton in the Eastern Mediterranean Sea (EMS; Crete, 2012) was tested by spiking oligotrophic surface seawater mesocosms (3 m3) with Saharan dust (SD; 1.6 g L−1; 23 nmol NOx mg−1; 2 ...
Travis B. Meador, Nadine I. Goldenstein, Alexandra Gogou, Barak Herut, Stella Psarra, Tatiana M. Tsagaraki, Kai-Uwe Hinrichs   +6 more
doaj   +1 more source

Spatial and seasonal contrasts of sedimentary organic matter in floodplain lakes of the central Amazon basin [PDF]

, 2015
In this study, we investigated the seasonal andspatial pattern of sedimentary organic matter (SOM) in fivefloodplain lakes of the central Amazon basin (Cabaliana,Janauaca, Canaçari, Mirituba and Curuai) which have differentmorphologies, hydrodynamics and
Abril, G., Bernardes, M.C., Kim, J.-H., Meziane, T., Moreira-Turcq, P., Mortillaro, J.M., Sinninghe Damsté, J.S., Sobrinho, R.L, Zell, C.I.   +8 more
core   +7 more sources

Photodynamic therapy – hypericin tetraether liposome conjugates and their antitumor and antiangiogenic activity

Drug Delivery, 2019
Photodynamic therapy (PDT) is an established noninvasive tumor treatment. The hydrophobic natural occurring pigment hypericin shows a lot of attractive properties for the application in PDT.
Nikola Plenagl, Lili Duse, Benjamin Sebastian Seitz, Nathalie Goergen, Shashank Reddy Pinnapireddy, Jarmila Jedelska, Jana Brüßler, Udo Bakowsky   +7 more
doaj   +1 more source

The last forests on Antarctica: Reconstructing flora and temperature from the Neogene Sirius Group, Transantarctic Mountains [PDF]

, 2018
Fossil-bearing deposits in the Transantarctic Mountains, Antarctica indicate that, despite the cold nature of the continent’s climate, a tundra ecosystem grew during periods of ice sheet retreat in the mid to late Neogene (17–2.5 Ma), 480 km from the ...
Ackert, Ashworth, Ashworth, Ashworth, Askin, Askin, Baas, Barrett, Bechtel, Beerling, Bendle, Biellmann, Biellmann, Bowman, Burckle, Bush, Caldicott, Carlquist, Christopher H. Vane, Cline, Cranwell, Cranwell, Dettmann, Diefendorf, Diefendorf, Diefendorf, Diefendorf, Domínguez, Eberle, Eglinton, Ficken, Ficken, Ficken, Fiona L. Gill, Fleming, Francis, Giri, Han, Hautevelle, Hemsley, Hill, Hill, Huang, James B. Riding, Jane E. Francis, Karrer, Kemp, Kolattukudy, Lawver, Lewis, Lewis, Lopes dos Santos, Marchand-Geneste, Mercer, Männistö, Nakamura, Nierop, Nott, Otto, Otto, Otto, Otto, Pancost, Peterse, Peterse, Pollard, Prebble, Pross, Raine, Raquel A. Lopes dos Santos, Retallack, Rhian L. Rees-Owen, Robert J. Newton, Ruza F. Ivanović, Shaver, Simoneit, Sinninghe Damsté, Stroeven, Stránský, Tavendale, Tavendale, Trendel, Volkman, Warny, Webb, Webb, Webb, Weijers, Weijers, Wilmesmeier, Yamamoto, Zachos   +91 more
core   +3 more sources

Stable archaeal tetraether lipid liposomes for photodynamic application: transfer of carboxyfluorescein to cultured T84 tumor cells

, 2017
Background: Archaeal membranes have phytanyl ether lipids instead of common fatty acid-glycerol esters in bacterial and eukaryotic cells. Sulfolobus and Thermoplasma species have unique membrane-spanning tetraether lipids (TEL), which form stable ...
A. Oertl, E. Antonopoulos, S. K. Freisleben, H. Freisleben   +3 more
semanticscholar   +1 more source