Results 101 to 110 of about 3,987 (248)

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

Exploring the Influence of Temperature on brGDGT Distributions in Chilean Lakes and Soils: A Comparative Analysis of In Situ Measured and Modeled Temperature Data

Journal of Geophysical Research: Biogeosciences, Volume 130, Issue 7, July 2025.
Abstract Branched glycerol dialkyl glycerol tetraethers (brGDGTs) are bacterial membrane‐spanning lipids that change in response to temperature variations. Their adaptability to temperature and widespread presence in sedimentary archives make brGDGTs a valuable tool for reconstructing past temperatures.
Molly D. O’Beirne, Jamie R. Vornlocher, Laura Lopera‐Congote, Emeka E. Emordi, Godspower Ubit, Sergio Contreras, A. Araneda, E. Tejos, J. Moscoso, Josef P. Werne   +9 more
wiley   +1 more source

Immuno Magnetic Thermosensitive Liposomes For Cancer Therapy [PDF]

, 2019
The present work describes the encapsulation of the drug doxorubicin (DOX) in immuno paramagnetic thermosensitive liposomes. DOX is the most common chemotherapeutic agent for the treatment of a variety of carcinomas.
Alawak, Mohamad
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

Biomarker evidence of a serpentinite chemosynthetic biosphere at the Mariana forearc

Communications Earth & Environment
Present-day serpentinization systems, such as that at the Mariana forearc, are prominent sources of reduced volatiles, including molecular hydrogen (H2) and methane (CH4), and are considered analogs for chemosynthetic ecosystems on early Earth.
Palash Kumawat, Elmar Albers, Wolfgang Bach, Frieder Klein, Walter Menapace, Christoph Vogt, Florence Schubotz   +6 more
doaj   +1 more source

Coherent millennial-scale patterns in Uk'37 and TEX86H temperature records during the penultimate interglacial-to-glacial cycle in the western Mediterranean [PDF]

, 2011
The TEX86H temperature proxy is a relatively new proxy based on crenarchaeotal lipids and has rarely been applied together with other temperature proxies. In this study, we applied the TEX86H on a sediment core from the Alboran Sea (western Mediterranean,
Anand, Anand, Baldacci, Belen Martrat, Bentaleb, Bárcena, Cacho, Carme Huguet, Castañeda, Colmenero-Hidalgo, Elderfield, Fabres, Garcia-Gorriz, Garcia-Gorriz, Gonzalez-Mora, Hayes, Herndl, Hopmans, Hopmans, Huguet, Huguet, Huguet, Huguet, Ingalls, Jaap S. Sinninghe Damsté, Joan O. Grimalt, Karner, Kim, Kim, Könneke, Lee, Leider, Lopes dos Santos, Martens-Habbena, Martinson, Martrat, Martrat, Masque, Massana, Menzel, Mollenhauer, Mollenhauer, Moreno, Murray, Müller, Parada, Park, Pérez-Folgado, Pérez-Folgado, Sanchez-Vidal, Sanchez-Vidal, Sarhan, Schouten, Schouten, Schouten, Schouten, Sinninghe Damsté, Skinner, Stefan Schouten, Ternois, Turich, Turich, Wakeham, Walsh, Weijers, Wuchter, Wuchter, Wuchter, Wuchter, Wuchter   +69 more
core   +3 more sources

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

Biomimetic surface modification with bolaamphiphilic archaeal tetraether lipids via liposome spreading

Biointerphases, 2014
Through investigations of the self-assembly behavior of three different tetraether lipids, the authors successfully established a solid supported, biomimetic tetraether lipid membrane via liposome spreading. These bolaamphiphilic lipids are the main compound in membranes of archaea, extremophile microorganisms, which underwent an enormous adaptation to
Christian, Bücher, Xenia, Grosse, Holger, Rothe, Annamaria, Fiethen, Hubert, Kuhn, Klaus, Liefeith   +5 more
openaire   +2 more sources

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

An Adaptation To Life In Acid Through A Novel Mevalonate Pathway. [PDF]

, 2016
Extreme acidophiles are capable of growth at pH values near zero. Sustaining life in acidic environments requires extensive adaptations of membranes, proton pumps, and DNA repair mechanisms.
Bowie, James U, Cummins, Matthew C, Korman, Tyler P, Vinokur, Jeffrey M   +3 more
core   +1 more source