Results 111 to 120 of about 1,034,422 (264)

Nitrogen isotope evidence for expanded ocean suboxia in the early Cenozoic [PDF]

, 2019
The million-year variability of the marine nitrogen cycle is poorly understood. Before 57 million years (Ma) ago, the ^(15)N/^(14)N ratio (δ^(15)N) of foraminifera shell-bound organic matter from three sediment cores was high, indicating expanded water ...
Auderset, Alexandra, Haug, Gerald H., Higgins, John A., Kast, Emma R., Martínez-García, Alfredo, Ren, Haojia, Sigman, Daniel M., Stolper, Daniel A., Wang, Xingchen T.   +8 more
core   +1 more source

Quantitative Estimates of Younger Dryas Freshening From Lipid δ2H Analysis in the Beaufort Sea

Geophysical Research Letters, Volume 52, Issue 4, 28 February 2025.
Abstract The leading hypothesis attributes the Younger Dryas (YD) event to a disruption in the Atlantic Meridional Overturning Circulation, driven by meltwater input from North America. Determining the origin, timing, and magnitude of YD freshening are crucial for understanding abrupt climate change.
Junjie Wu, Ruediger Stein, Julian P. Sachs, Matthew Wolhowe, Kirsten Fahl, Defang You   +5 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

Pliocene Warmth and Patterns of Climate Change Inferred From Paleoclimate Data Assimilation

AGU Advances, Volume 6, Issue 1, February 2025.
Abstract As the last time period when CO2 ${\text{CO}}_{2}$ concentrations were near 400 ppm, the Pliocene Epoch (5.33–2.58 Ma) is a useful paleoclimate target for understanding future climate change. Existing estimates of global warming and climate sensitivity during the Pliocene rely mainly on model simulations.
Jessica E. Tierney, Jonathan King, Matthew B. Osman, Jordan T. Abell, Natalie J. Burls, Ehsan Erfani, Vincent T. Cooper, Ran Feng   +7 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

Warming and Carbon Injection at the Paleocene‐Eocene Boundary: Bayesian Modeling Supports Synchroneity

Paleoceanography and Paleoclimatology, Volume 40, Issue 1, January 2025.
Abstract We evaluate lead‐lag relationships between warming associated with the Paleocene‐Eocene thermal maximum (PETM) and the attendant carbon isotope excursion (CIE) recorded in sedimentary archives from the mid‐Atlantic continental margin. Cores from the New Jersey coastal plain (NJCP) provide thick (up to 15 m), rapidly deposited shelf PETM ...
Maria Makarova, William J. Schmelz, Kenneth G. Miller, Timothy D. Herbert, Luca G. Podrecca, James V. Browning, Richard A. Mortlock, Linda V. Godfrey, James D. Wright   +8 more
wiley   +1 more source

The Headgroup (A)Symmetry Strongly Determines the Aggregation Behavior of Single-Chain Phenylene-Modified Bolalipids and Their Miscibility with Classical Phospholipids [PDF]

, 2014
In the present work, we describe the synthesis of two single-chain phenylene-modified bolalipids, namely PC-C17pPhC17-PC and PC-C17pPhC17-OH, with either symmetrical (phosphocholine) or asymmetrical (phosphocholine and hydroxyl) headgroups using a ...
Alfred Blume, Annette Meister, Bob-Dan Lechner, László Almásy, Simon Drescher, Vasil M. Garamus   +5 more
core   +1 more source

Global Warming and Equatorial Atlantic Paleoceanographic Changes During Early Eocene Carbon Cycle Perturbation V

Paleoceanography and Paleoclimatology, Volume 40, Issue 1, January 2025.
Abstract A series of transient global warming events (“hyperthermals”) in the early Eocene is marked by massive environmental and carbon cycle change. Among these events, the impacts of the Paleocene Eocene Thermal Maximum (∼56 Ma), Eocene Thermal Maximum 2 (∼54 Ma) and Eocene Thermal Maximum 3 (∼53 Ma) are relatively well documented.
Anne H. Kegel, Chris D. Fokkema, Henk Brinkhuis, Ursula Röhl, Thomas Westerhold, Claudia Agnini, Peter K. Bijl, Francien Peterse, Appy Sluijs   +8 more
wiley   +1 more source

Fire and ecosystem change in the Arctic across the Paleocene-Eocene Thermal Maximum [PDF]

, 2017
Fire has been an important component of ecosystems on a range of spatial and temporal scales. Fire can affect vegetation distribution, the carbon cycle, and climate.
Denis, Elizabeth H., Freeman, Katherine H., Pagani, Mark, Pedentchouk, Nikolai, Schouten, Stefan   +4 more
core   +1 more source

Disentangling influences of climate variability and lake-system evolution on climate proxies derived from isoprenoid and branched glycerol dialkyl glycerol tetraethers (GDGTs): the 250 kyr Lake Chala record [PDF]

Biogeosciences
High-resolution paleoclimate records from tropical continental settings are greatly needed to advance understanding of global climate dynamics. The International Continental Scientific Drilling Program (ICDP) project DeepCHALLA recovered a 214.8 m long ...
A. J. Baxter, F. Peterse, D. Verschuren, A. Maitituerdi, N. Waldmann, J. S. Sinninghe Damsté, J. S. Sinninghe Damsté   +6 more
doaj   +1 more source