6759期

最新文章

• Comparative connectomics of two distantly related nematode species reveals patterns of nervous system evolution AI翻译
  作者：Cook, Steven J.; Kalinski, Cristine A.; Loer, Curtis M.; Memar, Nadin; Majeed, Maryam; Stephen, Sarah Rebecca; Bumbarger, Daniel J.; Riebesell, Metta; Conradt, Barbara; Schnabel, Ralf; Sommer, Ralf J.; Hobert, Oliver
  作者单位：Columbia University; Howard Hughes Medical Institute; University of San Diego; Braunschweig University of Technology; University of Munich; Allen Institute for Brain Science; Institute for Basic Science - Korea (IBS); University of London; University College London
  摘要：Understanding the evolution of the bilaterian brain requires a detailed exploration of the precise nature of cellular and subcellular differences between related species. We undertook an electron micrographic reconstruction of the brain of the predatory nematode Pristionchus pacificus and compared the results with the brain of Caenorhabditis elegans, which diverged at least 100 million years ago. We revealed changes in neuronal cell death, neuronal cell position, axodendritic projection patter...
• Experiencing the Arctic AI翻译
  作者：Herndon, Jaime
• Negative capacitance overcomes Schottky-gate limits in GaN high-electron-mobility transistors AI翻译
  作者：Khan, Asir Intisar; Kim, Jeong-Kyu; Sikder, Urmita; Das, Koushik; Rodriguez, Thomas; Soman, Rohith; Chowdhury, Srabanti; Salahuddin, Sayeef
  作者单位：University of California System; University of California Berkeley; United States Department of Energy (DOE); Lawrence Berkeley National Laboratory; Stanford University; Stanford University; University of California System; University of California Berkeley
  摘要：For high-electron-mobility transistors based on two-dimensional electron gas (2DEG) within a quantum well-such as those based on AlGaN/GaN heterostructures-a Schottky gate is used to maximize the amount of charge that can be induced and thereby the current that can be achieved. However, the Schottky gate also leads to very high leakage current through the gate electrode. Adding a conventional dielectric layer between the nitride layers and gate metal can reduce leakage; but this comes at the p...
• High-field superconducting halo in UTe2 AI翻译
  作者：Lewin, Sylvia K.; Czajka, Peter; Frank, Corey E.; Saucedo Salas, Gicela; Noe II, G. Timothy; Yoon, Hyeok; Eo, Yun Suk; Paglione, Johnpierre; Nevidomskyy, Andriy H.; Singleton, John; Butch, Nicholas P.
  作者单位：National Institute of Standards & Technology (NIST) - USA; University System of Maryland; University of Maryland College Park; United States Department of Energy (DOE); Los Alamos National Laboratory; Canadian Institute for Advanced Research (CIFAR); Rice University; Rice University; Rice University
  摘要：The heavy fermion material UTe2 is a candidate topological superconductor that exhibits multiple magnetic field-induced superconducting phases. One such phase exists only at fields greater than 40 tesla, a considerable scale given its critical temperature of only 2 K. Here, we extend measurements of this state with fields outside of the bc crystallographic plane and reveal its core structure: The superconducting phase wraps around the b axis in a halo-like fashion and appears to be stabilized ...
• Advancing science- and evidence-based AI policy AI翻译
  作者：Bommasani, Rishi; Arora, Sanjeev; Chayes, Jennifer; Choi, Yejin; Cuellar, Mariano-Florentino; Fei-Fei, Li; Ho, Daniel E.; Jurafsky, Dan; Koyejo, Sanmi; Lakkaraju, Hima; Narayanan, Arvind; Nelson, Alondra; Pierson, Emma; Pineau, Joelle; Singer, Scott; Varoquaux, Gael; Venkatasubramanian, Suresh; Stoica, Ion; Liang, Percy; Song, Dawn
  作者单位：Stanford University; Princeton University; Princeton University; University of California System; University of California Berkeley; University of California System; University of California Berkeley; University of California System; University of California Berkeley; University of California System; University of California Berkeley; University of California System; University of California Berkeley; Stanford University; Stanford University; Stanford University; Stanford University; Stanford University; Stanford University; Harvard University; Harvard University; Princeton University; Institute for Advanced Study - USA; Institute for Advanced Study - USA; McGill University; University of Oxford; Brown University; Brown University
• A molecular machine directs the synthesis of a catenane AI翻译
  作者：Wachsmuth, Tommy; Kluifhooft, Robert; Mueller, Mira; Zeiss, Leon; Kathan, Michael
  作者单位：Humboldt University of Berlin
  摘要：Precise mechanical manipulation of molecules is inherently difficult owing to random thermal motion. Although directed movement on the molecular scale has been achieved, using it to impose specific-especially energetically disfavored-shapes on molecules and construct mechanically interlocked structures remains a fundamental challenge. In this study, we report the synthesis of a catenane enabled by a molecular motor that winds molecular strands into discrete entangled structures, each defined b...
• Spin-filter tunneling detection of antiferromagnetic resonance with electrically tunable damping AI翻译
  作者：Cham, Thow Min Jerald; Chica, Daniel G.; Huang, Xiaoxi; Watanabe, Kenji; Taniguchi, Takashi; Roy, Xavier; Luo, Yunqiu Kelly; Ralph, Daniel C.
  作者单位：Cornell University; Columbia University; National Institute for Materials Science; National Institute for Materials Science; University of Southern California; University of Southern California; University of Southern California; California Institute of Technology
  摘要：Antiferromagnetic spintronics offers the potential for higher-frequency operations and improved insensitivity to magnetic fields compared to ferromagnetic spintronics. However, previous electrical techniques to detect antiferromagnetic dynamics have utilized large, millimeter-scale bulk crystals. In this work, we demonstrate direct electrical detection of antiferromagnetic resonance in structures on the few-micrometer scale using spin-filter tunneling in platinum ditelluride (PtTe2)/bilayer ch...
• Beavers advance into the high Arctic AI翻译
  作者：Cornwall, Warren
• Cheap drug could make human blood toxic to mosquitoes AI翻译
  作者：Kupferschmidt, Kai
• AAAS creates new partner and member opportunities AI翻译
  作者：Staiano, Juli; Ham, Becky