Science

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• Quantum interference in atom-exchange reactions AI翻译
  作者：Liu, Yi-Xiang; Zhu, Lingbang; Luke, Jeshurun; Houwman, J. J. Arfor; Babin, Mark C.; Hu, Ming-Guang; Ni, Kang-Kuen
  作者单位：Harvard University; Harvard University; University of Innsbruck; Harvard University
  摘要：Chemical reactions, in which bonds break and form, are highly dynamic quantum processes. A fundamental question is whether coherence can be preserved in chemical reactions and then harnessed to generate entangled products. Here we investigated this question by studying the 2KRb -> K-2 + Rb-2 reaction at 500 nanokelvins, focusing on the nuclear spin degrees of freedom. We prepared the initial nuclear spins in KRb (potassium-rubidium) in an entangled state by lowering the magnetic field to where...
• A little fern packs a lot of DNA AI翻译
  作者：Brainard, Jeffrey
• Global pandemic treaty stalls, again, over equity concerns AI翻译
  作者：Cohen, Jon
  摘要：But negotiators approve new pandemic emergency alarm
• A master regulator of opioid reward in the ventral prefrontal cortex AI翻译
  作者：Smith, Alexander C. W.; Ghoshal, Soham; Centanni, Samuel W.; Heyer, Mary P.; Corona, Alberto; Wills, Lauren; Andraka, Emma; Lei, Ye; O'Connor, Richard M.; Caligiuri, Stephanie P. B.; Khan, Sohail; Beaumont, Kristin; Sebra, Robert P.; Kieffer, Brigitte L.; Winder, Danny G.; Ishikawa, Masago; Kenny, Paul J.
  作者单位：Icahn School of Medicine at Mount Sinai; Vanderbilt University; Icahn School of Medicine at Mount Sinai; McGill University; Institut National de la Sante et de la Recherche Medicale (Inserm); Universite de Lorraine; Universites de Strasbourg Etablissements Associes; Universite de Strasbourg; Medical University of South Carolina; Wake Forest University; University of Massachusetts System; University of Massachusetts Worcester; UMass Chan Medical School
  摘要：In addition to their intrinsic rewarding properties, opioids can also evoke aversive reactions that protect against misuse. Cellular mechanisms that govern the interplay between opioid reward and aversion are poorly understood. We used whole-brain activity mapping in mice to show that neurons in the dorsal peduncular nucleus (DPn) are highly responsive to the opioid oxycodone. Connectomic profiling revealed that DPn neurons innervate the parabrachial nucleus (PBn). Spatial and single-nuclei tr...
• Connecting lab, clinic, and community AI翻译
  作者：Bertagnolli, Monica M.
  作者单位：National Institutes of Health (NIH) - USA
  摘要：Despite great progress in biomedical research, the health of the US population appears to be getting worse. The United States spends substantially more per capita on health care than other wealthy countries, yet US life expectancy ranks low among its peers. Mortality rates have been increasing for segments of the US population, including those in rural areas, certain racial and ethnic groups, and individuals with low socioeconomic status. A whole-of-society approach is required to address such...
• The evolution of thermogenesis in mammals AI翻译
  作者：Grabek, Katharine R.; Sprenger, Ryan J.
  摘要：Comparative genomics elucidates the steps enabling heat production in fat tissue
• Brazil should prioritize young scientists at home AI翻译
  作者：Guedes, Thais B.; Pires, Mathias Mistretta; Garraffoni, Andre Rinaldo Senna; Pareja, Martin
  作者单位：Universidade de Sao Paulo; Universidade Estadual de Campinas; University of Gothenburg
• Strong-bonding hole-transport layers reduce ultraviolet degradation of perovskite solar cells AI翻译
  作者：Fei, Chengbin; Kuvayskaya, Anastasia; Shi, Xiaoqiang; Wang, Mengru; Shi, Zhifang; Jiao, Haoyang; Silverman, Timothy J.; Owen-Bellini, Michael; Dong, Yifan; Xian, Yeming; Scheidt, Rebecca; Wang, Xiaoming; Yang, Guang; Gu, Hangyu; Li, Nengxu; Dolan, Connor J.; Deng, Zhewen J. D.; Cakan, Deniz N.; Fenning, David P.; Yan, Yanfa; Beard, Matthew C.; Schelhas, Laura T.; Sellinger, Alan; Huang, Jinsong
  作者单位：University of North Carolina; University of North Carolina Chapel Hill; University of North Carolina School of Medicine; Colorado School of Mines; United States Department of Energy (DOE); National Renewable Energy Laboratory - USA; United States Department of Energy (DOE); National Renewable Energy Laboratory - USA; University System of Ohio; University of Toledo; University of California System; University of California San Diego; University of North Carolina; University of North Carolina Chapel Hill; University of North Carolina School of Medicine
  摘要：The light-emitting diodes (LEDs) used in indoor testing of perovskite solar cells do not expose them to the levels of ultraviolet (UV) radiation that they would receive in actual outdoor use. We report degradation mechanisms of p-i-n-structured perovskite solar cells under unfiltered sunlight and with LEDs. Weak chemical bonding between perovskites and polymer hole-transporting materials (HTMs) and transparent conducting oxides (TCOs) dominate the accelerated A-site cation migration, rather th...
• Curved crease origami and topological singularities enable hyperextensibility of L. olor AI翻译
  作者：Flaum, Eliott; Prakash, Manu
  作者单位：Stanford University; Stanford University; Stanford University; Stanford University; Stanford University
  摘要：Fundamental limits of cellular deformations, such as hyperextension of a living cell, remain poorly understood. Here, we describe how the single-celled protist Lacrymaria olor, a 40-micrometer cell, is capable of reversibly and repeatably extending its necklike protrusion up to 1200 micrometers in 30 seconds. We discovered a layered cortical cytoskeleton and membrane architecture that enables hyperextensions through the folding and unfolding of cellular-scale origami. Physical models of this c...
• 撤稿声明: Drought sensitivity in mesic forests heightens their vulnerability to climate change (Retraction of Vol 382, Pg 1171, 2023) AI翻译
  作者：Heilmayr, Robert; Dudney, Joan; Moore, Frances C.
  作者单位：University of California System; University of California Santa Barbara; University of California System; University of California Santa Barbara; University of California System; University of California Davis