Results 101 to 110 of about 60,044 (291)

The Dual Origin of the Terrestrial Atmosphere

, 2003
The origin of the terrestrial atmosphere is one of the most puzzling enigmas in the planetary sciences. It is suggested here that two sources contributed to its formation, fractionated nebular gases and accreted cometary volatiles.
Abe, Anders, Ballentine, Balsiger, Bar-Nun, Bar-Nun, Benz, Bockelée-Morvan, Burnard, Busemann, Caffee, Chen, Chyba, Chyba, Dauphas, Dauphas, Dauphas, Dauphas, Dauphas, Dauphas, Delsemme, Delsemme, Eberhardt, Holland, Honda, Honda, Hunten, Hunten, Ihaka, Iro, Jagoutz, Kerridge, Kimura, Kleine, Kunz, Laufer, Marty, Marty, Marty, Maréchal, Mathew, Mathew, Matsui, Matsumoto, Mazor, Meier, Meisel, Meisel, Morbidelli, Moreira, Moreira, Nicolas Dauphas, Notesco, Notesco, Owen, Owen, Owen, Owen, Ozima, Ozima, Ozima, Pepin, Pepin, Pepin, Pepin, Pepin, Pepin, Podosek, Porcelli, Porcelli, Press, Sagan, Sarda, Sasaki, Schoenberg, Shoemaker, Swindle, Swindle, Tolstikhin, Trieloff, Walker, Wieler, Wieler, Yamamoto, Yin, Yokochi, Zahnle, Zahnle, Zahnle, Zahnle, Zahnle, Zhang   +91 more
core   +1 more source

Stabilization of Single Metal Atoms on Graphitic Carbon Nitride: Synthetic Strategies and Emerging Applications

Advanced Science, EarlyView.
This review highlights recent advancements in stabilizing single metal atoms on graphitic carbon nitride emphasizing innovative synthesis strategies and emerging applications in electrocatalysis, photocatalysis and organic transformations, along with key challenges and future perspective. Abstract Emerging as a new frontier in catalysis science, single‐
Wenyao Zhang, Junjie Cui, Zhenjie Yao, Boyuan Zhu, Nithinraj Panangattu Dharmarajan, Ajayan Vinu, Junwu Zhu   +6 more
wiley   +1 more source

First Detection of CH3OD in Prestellar Cores

The Astrophysical Journal
The isotopic ratios of deuterated methanol derived around protostars are commonly used to infer the physical conditions under which they formed in the earlier prestellar stage.
Beatrice M. Kulterer, Asunción Fuente, Maria N. Drozdovskaya, Silvia Spezzano, Gisela Esplugues, David Navarro-Almaida, Marina Rodríguez Baras, Angèle Taillard, Karin Öberg   +8 more
doaj   +1 more source

Equilibrium Abundances of Stable Isotopes [PDF]

Progress of Theoretical Physics, 1961
Equilibrium distribution calculated using the analogue of Saha's ionization formula is examined with the recent nuclear masses and abundance data. It is found that up to A = 92, the abundance distribution can be well reproduced. The electron degeneracy which becomes important is also considered for the region A = 64-92.
openaire   +1 more source

Nanoarchitectonics of Porous Carbons Templated by Inorganic Metal Oxides and Alkali Metal Salts for Energy and Environmental Applications

Advanced Science, EarlyView.
This review explores inorganic metal oxides and metal salt nanoparticles templated porous carbons, highlighting their synthesis, structural features, and performance in energy and environmental applications. It critically compares template types, porosity control, and functional outcomes across recent literature.
Gurwinder Singh, Jibi Kunjumon, Harleen Kaur, Narinder Singh, Gregory Franklin, Arpita Pandey Tiwari, Lukas Van Zweiten, John Kennedy, Ajayan Vinu   +8 more
wiley   +1 more source

A New Reaction Rate of the 27Al(p,γ)28Si Reaction Based on Indirect Low-energy Cross-section Measurements

The Astrophysical Journal
The Mg–Al cycle is characteristic of the high-temperature ( T  ∼ 0.055 GK) H-burning of evolved stars and their nucleosynthesis. A proper comprehension of this reaction network can help in solving debated questions such as the occurrence of ...
M. La Cognata, S. Palmerini, F. Dell’Agli, P. Ventura, P. Adsley, R. Alba, S. Cherubini, M. Costa, A. Di Pietro, P. Figuera, G. L. Guardo, M. Gulino, F. Hammache, M. La Commara, L. Lamia, D. Lattuada, C. Maiolino, M. Mazzocco, A. Oliva, R. G. Pizzone, P. M. Prajapati, G. G. Rapisarda, S. Romano, D. Santonocito, M. L. Sergi, R. Spartá, A. Tumino   +26 more
doaj   +1 more source

Chemical Compositions of Evolved Stars From Near-Infrared IGRINS High-Resolution Spectra. I. Abundances in Three Red Horizontal Branch Stars

, 2018
We have derived elemental abundances of three field red horizontal branch stars using high-resolution (R$\simeq$ 45,000), high signal-to-noise ratio (S/N $\gtrsim$ 200) $H$ and $K$ band spectra obtained with the Immersion Grating Infrared Spectrograph ...
Afşar, Melike, Bozkurt, Zeynep, Jaffe, Daniel T., Kim, Hwihyun, Lawler, James E., Mace, Gregory N., Sneden, Christopher, Topcu, Gamze Böcek, Wood, Michael P.   +8 more
core   +1 more source

Gut Lactate Boosts Ruminococcus via Histone Lactylation to Mediate Time‐Restricted Feeding Protection in Crohn's Disease

Advanced Science, EarlyView.
TRF enriches Ruminococcus, a bacterial genus producing SCFAs, and activates the epithelial HIF‐1α signaling pathway. This mechanism protects the colonic mucosa from inflammatory insults in colitis models. Mechanistically, gut lactate production during starvation and refeeding mediates H4K12la, which increases SLC9A3 expression and creates an acidic gut
Linwen Huang, Huishi Tan, Senhui Weng, Yuntao Liu, Lingxu Song, Shaoyu Cheng, Zelong Lin, Jiawei Chen, Fei Tan, Jun Wang, Jinke Huang, Linkun Cai, Jiwei Chai, Cailing Zhong, Yanqiang Shi, Wendi Zhang, Haiyan Zhang, Chongyang Huang   +17 more
wiley   +1 more source

Chemistry in the GG Tau A Disk: Constraints from H2D+, N2H+, and DCO+ High Angular Resolution ALMA Observations

The Astrophysical Journal
Resolved molecular line observations are essential for gaining insight into the physical and chemical structure of protoplanetary disks, particularly in cold, dense regions where planets form and acquire their chemical compositions.
Parashmoni Kashyap, Liton Majumdar, Anne Dutrey, Stéphane Guilloteau, Karen Willacy, Edwige Chapillon, Richard Teague, Dmitry Semenov, Thomas Henning, Neal Turner, Raghvendra Sahai, Ágnes Kóspál, Audrey Coutens, V. Piétu, Pierre Gratier, Maxime Ruaud, N. T. Phuong, E. Di Folco, Chin-Fei Lee, Y.-W. Tang   +19 more
doaj   +1 more source

Global Nitrogen Deposition Promotes Carbon Sink Formation in Terrestrial Ecosystems

Advanced Science, EarlyView.
Nitrogen deposition alleviates ecosystem N limitation and enhances carbon sinks. Using 829 observations, we show 36% of deposited N is retained globally (39.15 Tg N yr−1), with distinct NHx and NOy contributions. This retention drives a terrestrial C sink of 0.88 Pg C yr−1 (25.48%), highlighting the importance of pool‐specific C:N stoichiometry ...
Lei Li, Mingyu Xie, Nan Jia, Li‐Dong Mo, Qiang Yu, Fanjiang Zeng, Xiangyi Li   +6 more
wiley   +1 more source