6800期

最新文章

• Can enhanced alkalinity store carbon durably? AI翻译
  作者：Isson, Terry; West, A. Joshua
  作者单位：University of Waikato; University of Southern California
  摘要：Key questions remain about carbon removal strategies in open environmental systems
• Cloudy mornings and clear evenings on a gas giant exoplanet AI翻译
  作者：Mukherjee, Sagnick; Sing, David K.; Fu, Guangwei; Stevenson, Kevin B.; Schmidt, Stephen P.; Baskett, Harry; Mak, Mei Ting; McCreery, Patrick; Allen, Natalie H.; Bennett, Katherine A.; Christie, Duncan A.; Gascon, Carlos; Goyal, Jayesh; Hebrard, Eric; Lothringer, Joshua D.; Lopez-Morales, Mercedes; Lustig-Yaeger, Jacob; May, Erin M.; Mayorga, L. C.; Mayne, Nathan; Ramos Rosado, Lakeisha M.; Reggiani, Henrique; Rustamkulov, Zafar; Schlaufman, Kevin C.; Sotzen, Kristin S.; Thorngren, Daniel; Wang, Le-Chris; Zamyatina, Maria
  作者单位：Johns Hopkins University; University of California System; University of California Santa Cruz; Arizona State University; Arizona State University-Tempe; Johns Hopkins University; Johns Hopkins University; Johns Hopkins University Applied Physics Laboratory; University of Exeter; University of Oxford; Max Planck Society; Harvard University; Smithsonian Institution; Institut d'Estudis Espacials de Catalunya (IEEC); National Institute of Science Education & Research (NISER); Homi Bhabha National Institute; Space Telescope Science Institute
  摘要：The spectra of exoplanet atmospheres are affected by aerosols (clouds and hazes) of uncertain origin. Proposed aerosol formation mechanisms include gas condensation or photochemical reactions. We measured the transmission spectrum of the tidally locked gas giant exoplanet WaSP- 94a b and identified asymmetry in its atmosphere. The morning limb is cooler and cloudy, whereas the evening limb is hotter and exhibits gaseous water absorption features. We interpret this difference as being due to th...
• Abrupt stream acidification and metal mobilization from permafrost degradation AI翻译
  作者：Skierszkan, Elliott K.; Szeitz, Andras J.; Lindsay, Matthew B. J.; Carey, Sean K.
  作者单位：Carleton University; University of Saskatchewan; McMaster University
  摘要：Stream chemistry and ecosystem function are being transformed by abrupt acceleration of sulfide-mineral oxidation in permafrost-underlain headwater catchments of the Yukon and Mackenzie river basins-the two largest (sub)Arctic rivers in North America. Over the past decade, dozens of acidic (pH similar to 3) seepages have emerged in these headwaters, causing vegetation dieback and mobilizing metals at acutely toxic concentrations in receiving streams. Acid generated during sulfide-mineral oxida...
• Brothers in arms AI翻译
  作者：Stone, Richard
• The oscillatory biology of sleep: Linkage to dementia AI翻译
  作者：Nedergaard, Maiken
  作者单位：University of Rochester; University of Copenhagen
  摘要：During wakefulness, neuromodulators operate largely independently to support behavior and cognition. By contrast, sleep reorganizes their activity into a coordinated brain rhythm. During sleep, the major neuromodulators-norepinephrine, acetylcholine, serotonin, and dopamine-exhibit synchronized fluctuations with a periodicity of similar to 50 seconds. These oscillations appear as recurrent bursts of fast (10 to 30 hertz) electroencephalography activity and are phase-coupled to cerebrospinal fl...
• Magnon hydrodynamics in an atomically thin ferromagnet AI翻译
  作者：Xue, Ruolan; Maksimovic, Nikola; Dolgirev, Pavel E.; Xia, Li-Qiao; Muller, Aaron; Kitagawa, Ryota; Machado, Francisco; Klein, Dahlia R.; MacNeill, David; Watanabe, Kenji; Taniguchi, Takashi; Jarillo-Herrero, Pablo; Lukin, Mikhail D.; Demler, Eugene; Yacoby, Amir
  作者单位：Harvard University; Harvard University; Massachusetts Institute of Technology (MIT); Institute of Science Tokyo; Tokyo Institute of Technology; Smithsonian Institution; Harvard University; Smithsonian Astrophysical Observatory; Weizmann Institute of Science; National Institute for Materials Science
  摘要：Strong interactions between particles can lead to emergent collective excitations. Spin waves, known as magnons, have been predicted to reach a strongly interacting hydrodynamic regime, where they form a slow collective density mode. In this work, we isolate exfoliated sheets of chromium trichloride (CrCl3), where magnon interactions are strong, and develop a technique to measure the collective magnon dynamics though nearby nitrogen-vacancy centers in diamond. Thermal magnetic fluctuations gen...
• Divergent and programmable skeletal remodeling of complex macrocycles with a small method set AI翻译
  作者：Nikbakht, Ali; Li, Xinghan; Wan, Jing; Qin, Can; Hoveyda, Amir H.
  作者单位：Universites de Strasbourg Etablissements Associes; Centre National de la Recherche Scientifique (CNRS); Universite de Strasbourg; Universites de Strasbourg Etablissements Associes; Universite de Strasbourg; Boston College
  摘要：The bioactivity of complex organic macrocycles can vary unpredictably with their three-dimensional structural contours. Here, we present a streamlined, programmable, and systematic strategy for skeletal remodeling of large organic rings. The central diversification platform (hub) is a readily available macrocyclic olefin or a diene. Six transformations, all but one catalytic, are needed: macrocyclic ring-opening/ cross-metathesis for cleaving a ring to generate a diene, cross-metathesis and al...
• Designer molecules could power quantum computers AI翻译
  作者：Savitsky, Zack
• Mucosal vaccination in mice provides protection from diverse respiratory threats AI翻译
  作者：Zhang, Haibo; Floyd, Katharine; Fang, Zhuoqing; Hoffmann, Filipe Araujo; Lee, Audrey; Froggatt, Heather Marie; Bharj, Gurpreet; Xie, Xia; Eppler, Haleigh B.; Santagata, Jordan Mariah; Wang, Yanli; Hu, Mengyun; Fox, Christopher B.; Arunachalam, Prabhu S.; Baric, Ralph; Suthar, Mehul S.; Pulendran, Bali
  作者单位：Stanford Medicine; Stanford University; Emory University; Children's Healthcare of Atlanta (CHOA); University of North Carolina; University of North Carolina Chapel Hill; University of North Carolina School of Medicine; University of Washington; University of Washington Seattle; University of Arizona; University of Arizona Health Sciences; Stanford University; Stanford Medicine; Stanford Medicine; Stanford University; Agency for Science Technology & Research (A*STAR); A*STAR - Genome Institute of Singapore (GIS); Duke University; Utah System of Higher Education; Utah State University
  摘要：Traditional vaccines target specific pathogens, limiting their scope against diverse respiratory threats. We describe an intranasal liposomal formulation combining toll- like receptor 4 and 7/8 ligands with a model antigen, ovalbumin, which provided broad, durable protection in mice for at least 3 months against infection with severe acute respiratory syndrome coronavirus 2 (SaRS- CoV- 2) and Staphylococcus aureus. In addition, the vaccine protected mice from other viruses (SaRS- CoV- 2, SaRS,...
• Taking plant membrane temperatures AI翻译
  作者：Davis, Seth J.; Ronald, James
  作者单位：University of York - UK