6678期

最新文章

• The genetic basis of a recent transition to live-bearing in marine snails AI翻译
  作者：Stankowski, Sean; Zagrodzka, Zuzanna B.; Garlovsky, Martin D.; Pal, Arka; Shipilina, Daria; Castillo, Diego Garcia; Lifchitz, Hila; Le Moan, Alan; Leder, Erica; Reeve, James; Johannesson, Kerstin; Westram, Anja M.; Butlin, Roger K.
  作者单位：University of Sheffield; Institute of Science & Technology - Austria; University of Sussex; Technische Universitat Dresden; Uppsala University; Centre National de la Recherche Scientifique (CNRS); Sorbonne Universite; University of Gothenburg; University of Oslo; Nord University
  摘要：Key innovations are fundamental to biological diversification, but their genetic basis is poorly understood. A recent transition from egg-laying to live-bearing in marine snails (Littorina spp.) provides the opportunity to study the genetic architecture of an innovation that has evolved repeatedly across animals. Individuals do not cluster by reproductive mode in a genome-wide phylogeny, but local genealogical analysis revealed numerous small genomic regions where all live-bearers carry the sa...
• Direct propylene epoxidation via water activation over Pd-Pt electrocatalysts AI翻译
  作者：Chung, Minju; Maalouf, Joseph H.; Adams, Jason S.; Jiang, Chenyu; Roman-Leshkov, Yuriy; Manthiram, Karthish
  作者单位：Massachusetts Institute of Technology (MIT); California Institute of Technology
  摘要：Direct electrochemical propylene epoxidation by means of water-oxidation intermediates presents a sustainable alternative to existing routes that involve hazardous chlorine or peroxide reagents. We report an oxidized palladium-platinum alloy catalyst (PdPtOx/C), which reaches a Faradaic efficiency of 66 +/- 5% toward propylene epoxidation at 50 milliamperes per square centimeter at ambient temperature and pressure. Embedding platinum into the palladium oxide crystal structure stabilized oxidiz...
• Antidengue mosquitoes take off AI翻译
  作者：Brainard, Jeffrey
• Dealuminated Beta zeolite reverses Ostwald ripening for durable copper nanoparticle catalysts AI翻译
  作者：Liu, Lujie; Lu, Jiaye; Yang, Yahui; Ruettinger, Wolfgang; Gao, Xinhua; Wang, Ming; Lou, Hao; Wang, Zhandong; Liu, Yifeng; Tao, Xin; Li, Lina; Wang, Yong; Li, Hangjie; Zhou, Hang; Wang, Chengtao; Luo, Qingsong; Wu, Huixin; Zhang, Kaidi; Ma, Jiabi; Cao, Xiaoming; Wang, Liang; Xiao, Feng-Shou
  作者单位：Zhejiang University; East China University of Science & Technology; BASF; Ningxia University; Beijing Institute of Technology; Chinese Academy of Sciences; University of Science & Technology of China, CAS; Zhejiang University; Chinese Academy of Sciences; Shanghai Institute of Applied Physics, CAS; Zhejiang University; Zhejiang University; Shanghai Jiao Tong University; Beijing University of Chemical Technology
  摘要：Copper nanoparticle-based catalysts have been extensively applied in industry, but the nanoparticles tend to sinter into larger ones in the chemical atmospheres, which is detrimental to catalyst performance. In this work, we used dealuminated Beta zeolite to support copper nanoparticles (Cu/Beta-deAl) and showed that these particles become smaller in methanol vapor at 200 degrees C, decreasing from similar to 5.6 to similar to 2.4 nanometers in diameter, which is opposite to the general sinter...
• Fusion megaproject faces delay AI翻译
  作者：[Anonymous]
• De Haas-van Alphen spectroscopy and magnetic breakdown in moiré graphene AI翻译
  作者：Bocarsly, Matan; Uzan, Matan; Roy, Indranil; Grover, Sameer; Xiao, Jiewen; Dong, Zhiyu; Labendik, Mikhail; Uri, Aviram; Huber, Martin E.; Myasoedov, Yuri; Watanabe, Kenji; Taniguchi, Takashi; Yan, Binghai; Levitov, Leonid S.; Zeldov, Eli
  作者单位：Weizmann Institute of Science; Massachusetts Institute of Technology (MIT); University of Colorado System; University of Colorado Denver; Children's Hospital Colorado; University of Colorado Anschutz Medical Campus; National Institute for Materials Science; National Institute for Materials Science
  摘要：Quantum oscillations originating from the quantization of electron cyclotron orbits provide sensitive diagnostics of electron bands and interactions. We report on nanoscale imaging of the thermodynamic magnetization oscillations caused by the de Haas-van Alphen effect in moire graphene. Scanning by means of superconducting quantum interference device (SQUID)-on-tip in Bernal bilayer graphene crystal axis-aligned to hexagonal boron nitride reveals large magnetization oscillations with amplitude...
• Restoring tolerance with antigen delivery AI翻译
  作者：Jabri, Bana; Abadie, Valerie
  作者单位：University of Chicago; University of Chicago; University of Chicago; University of Chicago
  摘要：Autoimmune disorders encompass a wide range of immunological diseases that affect 4 to 10% of the population worldwide. They occur when immunological tolerance toward self-antigens is broken, resulting in immune responses against cells, tissues, or organs that lead to tissue dysfunction and/or destruction. The goal of autoimmune disease therapy is to restore tolerance to the self-antigen that causes the pathology by targeting autoreactive T cells while preserving immune competence to prevent i...
• Balancing risk-return decisions by manipulating the mesofrontal circuits in primates AI翻译
  作者：Sasaki, Ryo; Ohta, Yasumi; Onoe, Hirotaka; Yamaguchi, Reona; Miyamoto, Takeshi; Tokuda, Takashi; Tamaki, Yuki; Isa, Kaoru; Takahashi, Jun; Kobayashi, Kenta; Ohta, Jun; Isa, Tadashi
  作者单位：Kyoto University; Nara Institute of Science & Technology; Kyoto University; Kyoto University; Japan Society for the Promotion of Science; Institute of Science Tokyo; Tokyo Institute of Technology; Kyoto University; National Institutes of Natural Sciences (NINS) - Japan; National Institute for Physiological Sciences (NIPS)
  摘要：Decision-making is always coupled with some level of risk, with more pathological forms of risk-taking decisions manifesting as gambling disorders. In macaque monkeys trained in a high risk-high return (HH) versus low risk-low return (LL) choice task, we found that the reversible pharmacological inactivation of ventral Brodmann area 6 (area 6V) impaired the risk dependency of decision-making. Selective optogenetic activation of the mesofrontal pathway from the ventral tegmental area (VTA) to t...
• A stable rhodium-coordinated carbene with a σ0π2 electronic configuration AI翻译
  作者：Hu, Chaopeng; Wang, Xin-Feng; Li, Jiancheng; Chang, Xiao-Yong; Liu, Liu Leo
  作者单位：Southern University of Science & Technology
  摘要：Isolable singlet carbenes have universally adopted a sigma(2)pi(0) electronic state, making them sigma-donors and pi-acceptors. We present a rhodium-coordinated, cationic cyclic diphosphinocarbene with a sigma(0)pi(2) ground state configuration. Nuclear magnetic resonance spectroscopy studies show a carbene carbon chemical shift below -30.0 parts per million. X-ray crystallography reveals a planar RhP2C configuration. Quantum chemical calculations rationalize how sigma-electron delocalization/...
• Plant waste buried at sea to fight climate change AI翻译
  作者：Sidik, Saima