Results 91 to 100 of about 1,179,358 (368)

Barium isotopic composition of mainstream silicon carbides from Murchison : constraints for s-process nucleosynthesis in asymptotic giant branch stars [PDF]

, 2014
We present barium, carbon, and silicon isotopic compositions of 38 acid-cleaned presolar SiC grains from Murchison. Comparison with previous data shows that acid washing is highly effective in removing barium contamination.
Bisterzo, Sara, Cristallo, Sergio, Dauphas, Nicolas, Davis, Andrew M., Gallino, Roberto, Gyngard, Frank, Herwig, Falk, Liu, Nan, Pellin, Michael J., Pellin, Michael Joseph, Pignatari, Marco, Savina, Michael, Savina, Michael R., Straniero, Oscar, Willingham, David, Willingham, David G.   +15 more
core   +2 more sources

Abundances of Meteoric Lead Isotopes [PDF]

Nature, 1957
IN a recent publication Patterson1 shows that the measured isotopic abundances of leads from five different meteorites and recent terrestrial ocean sediments are simply related. From this fact, following a series of convincing arguments, he deduces that all these leads have developed from a single primeval lead by the addition of radiogenic lead-206 ...
openaire   +2 more sources

Harmonizing the Pyrene and Ether Groups in Covalent Triazine Polymers for Highly Effective H2O2 Photosynthesis via One‐Step Two‐Electron Oxygen Reduction

Advanced Functional Materials, EarlyView.
The pyrene and ether groups are incorporated into the covalent triazine polymer (CTP) structure. The synergistic effect of the two functional groups endows CTP with better electron transfer, light absorption, and oxygen activation properties. An impressive apparent quantum yield (13.2% @420 nm) and a remarkable solar‐to‐chemical conversion efficiency ...
Chong Wang, Jinliang Lv, Yichun Lu, Hanfeng Ye, Xuan Zhang, Leonardo Cancellara, Nadezda Tarakina, Jiande Lin, Xin Gao, Oleksandr Savateev, Jiajia Cheng   +10 more
wiley   +1 more source

Tandem Mass Spectrometry for 13C Metabolic Flux Analysis: Methods and Algorithms Based on EMU Framework

Frontiers in Microbiology, 2019
In the past two decades, 13C metabolic flux analysis (13C-MFA) has matured into a powerful and widely used scientific tool in metabolic engineering and systems biology.
Jungik Choi, Maciek R. Antoniewicz
doaj   +1 more source

Determining the Elemental and Isotopic Composition of the preSolar Nebula from Genesis Data Analysis: The Case of Oxygen [PDF]

, 2017
We compare element and isotopic fractionations measured in solar wind samples collected by NASA's Genesis mission with those predicted from models incorporating both the ponderomotive force in the chromosphere and conservation of the first adiabatic ...
Burnett, D. S., Guan, Y., Heber, V. S., Hervig, R., Huss, G. R., Jurewicz, A. J. G., Koeman-Shields, E. C., Laming, J. Martin, McKeegan, K. D., Nittler, L. R., Reisenfeld, D. B., Rieck, K. D., Wang, J., Wiens, R. C., Woolum, D. S.   +14 more
core   +3 more sources

Synergistic Fluorine and Cyanide Co‐Modification to Reinforce Photoinduced Excitons Formation and Transfer for Efficient CO2 Photoreduction

Advanced Functional Materials, EarlyView.
An advanced F‐doped and ─CN group co‐modified FCCN is developed. Due to the synergistic effects of co‐modification in promoting photogenerated exciton generation, enhancing charge kinetics, expanding active interfacial areas, and optimizing CO2 interfacial reactions, the FCCN photocatalyst demonstrates excellent catalytic performance and high ...
Sheng‐Qi Guo, Qingqing Dong, Xiaodong Sun, Ziqi Zhang, Linda Wang, Lei Bao, Bozhan Li, Hui Li, Yanrui Li, Tianyi Ma   +9 more
wiley   +1 more source

Hominin palaeoecology in Late Pliocene Malawi: First insights from isotopes (13C, 18O) in mammal teeth

South African Journal of Science, 2011
Carbon-13 and oxygen-18 abundances were measured in large mammal skeletal remains (tooth enamel, dentine and bone) from the Chiwondo Beds in Malawi, which were dated by biostratigraphic correlation to ca. 2.5 million years ago.
Herv é Bocherens, Oliver Sandrock, Ottmar Kullmer, Friedemann Schrenk   +3 more
doaj  

The Wanderer: Charting WASP-77A b’s Formation and Migration Using a System-wide Inventory of Carbon and Oxygen Abundances

The Astrophysical Journal
The elemental and isotopic abundances of volatiles like carbon, oxygen, and nitrogen may trace a planet’s formation location relative to H _2 O, CO _2 , CO, NH _3 , and N _2 “snowlines,” or the distance from the star at which these volatile elements ...
David R. Coria, Neda Hejazi, Ian J. M. Crossfield, Maleah Rhem   +3 more
doaj   +1 more source

First inverse kinematics measurement of key resonances in the 22Ne(p,γ)23Na reaction at stellar temperatures

Physics Letters B, 2020
In this Letter we report on the first inverse kinematics measurement of key resonances in the Ne22(p,γ)23Na reaction which forms part of the NeNa cycle, and is relevant for 23Na synthesis in asymptotic giant branch (AGB) stars.
A. Lennarz, M. Williams, A.M. Laird, U. Battino, A.A. Chen, D. Connolly, B. Davids, N. Esker, R. Garg, M. Gay, U. Greife, U. Hager, D. Hutcheon, J. José, M. Lovely, S. Lyons, A. Psaltis, J.E. Riley, A. Tattersall, C. Ruiz   +19 more
doaj   +1 more source

Modulating Surface‐Active Hydrogen for Facilitating Nitrate‐to‐Ammonia Electroreduction on Layered Double Hydroxides Nanosheets

Advanced Functional Materials, EarlyView.
The NiCuFe‐layered double hydroxides nanosheets are synthesized for facilitating nitrate‐to‐ammonia with a high ammonia yield of 1.64 mmol h−1 cm−2, Faradaic efficiency of 94.8% and stability for 15 cycles. The assembled Zn‐nitrate battery delivers a remarkable power density of 12.4 mW cm−2.
Bin Liu, Yuan Wang, Huiming Wen, Yuchen Wang, Heng Liu, Bo Da, Ke Li, Hao Luo, Hao Li, Kai Yan   +9 more
wiley   +1 more source