6811期

最新文章

• What triggered the atmosphere's great oxygen surge? AI翻译
  作者：Voosen, Paul
• NASA's PUNCH punches up space weather forecasts AI翻译
  作者：Berkowitz, Rachel
• Weekly HIV pill moves closer but vaccine studies face new questions AI翻译
  作者：Cohen, Jon
• New rules on risky biology studies get mixed reviews AI翻译
  作者：Reardon, Sara
• Vicinal disubstitution of alkyl C-X synthons via alkene radical cation generation AI翻译
  作者：Zhang, Yufei; Das, Tamal; Xuan, Zi; Das, Mrinmoy; Bisiriyu, Hammed O.; Nudler, Alon; Parasch, Ben D.; Resmini, Matthew D.; Graham, Aubrey E.; Watson, David F.; Hirschi, Jennifer S.; Musacchio, Patricia Z.
  作者单位：State University of New York (SUNY) System; University at Buffalo, SUNY; Worcester Polytechnic Institute; University at Albany, SUNY; State University of New York (SUNY) System; Binghamton University, SUNY
  摘要：In organic chemistry, functionalization of two adjacent carbons often starts from alkenes or already disubstituted precursors. Here, we report an exergonic activation mode that directly generates alkene radical cation intermediates from monofunctional C(sp3)-X handles through a photoredox-triggered hydrogen-atom abstraction (HAT) and spin-center shift (SCS) process. Computations show that electron delocalization and a network of hydrogen-bonding solvent molecules facilitate a concerted [HAT+SC...
• Turbulent seismoacoustic imprints during a hurricane landfall AI翻译
  作者：Ji, Qing; Dey, Ipshita; Dunham, Eric M.
  作者单位：Stanford University; Stanford University; UK Research & Innovation (UKRI); Natural Environment Research Council (NERC); NERC National Centre for Atmospheric Science; University of Reading; Stanford University; University of Texas System; University of Texas Austin
  摘要：Hurricane evolution is affected by turbulence in the hurricane boundary layer (HBL), which is typically measured using aircraft flights and towers. Through a case study of a landfalling hurricane, we show that seismoacoustic data can also be used for HBL turbulence analysis. We identified contributions of HBL turbulence in infrasound pressure and seismic displacement, validating our interpretation by combining large-eddy simulation, calibrated with meteorological data, with quasi-static elasti...
• Genes of an icon AI翻译
  作者：Price, Michael
• A central role for dietary sugars in human evolution AI翻译
  作者：Brand-Miller, Jennie; Hardy, Karen; Raubenheimer, David; Copeland, Les
  作者单位：University of Sydney; University of Sydney; University of Glasgow; University of Sydney; University of Sydney
  摘要：What did our ancestors eat? Current understanding of diet in human evolution is predicated on abundant animal foods and mastery of fire, both unlikely for early hominins. Using multiple lines of evidence, including the metabolic requirements of an enlarging brain and reproduction, we model macronutrient distribution across 4 million years of evolution. Before cooking made starch easily digestible, the sugars in fruit and honey provided glucose, the brain's preferred fuel. Modeling suggests tha...
• Levitated sensor for magnetometry in ambient environment AI翻译
  作者：Ji, Wei; Xu, Changhao; Qu, Guofeng; Budker, Dmitry
  作者单位：Peking University; Peking University; Johannes Gutenberg University of Mainz; Northeast Normal University - China; Sichuan University; Helmholtz Association; GSI Helmholtz-Center for Heavy Ion Research; University of California System; University of California Berkeley
  摘要：Levitated particle systems have gained attention as a rapidly advancing platform for precision sensing, offering low-loss, highly isolated environments by eliminating mechanical contact and associated noise. Current room-temperature levitation techniques are primarily sensitive to acceleration, and it remains challenging to integrate them with high-sensitivity magnetic sensing. In this work, we demonstrate a diamagnetically stabilized magnetically levitated magnet magnetometer, where the motio...
• Change comes for science publishing paradigms AI翻译
  作者：Montague-Hellen, Beth
  作者单位：Francis Crick Institute