6754期

最新文章

• Gradient refractive indices enable squid structural color and inspire multispectral materials AI翻译
  作者：Bogdanov, Georgii; Strzelecka, Aleksandra Anna; Kaimal, Nikhil; Senft, Stephen L.; Lee, Sanghoon; Hanlon, Roger T.; Gorodetsky, Alon A.
  作者单位：University of California System; University of California Irvine; Marine Biological Laboratory - Woods Hole; University of California System; University of California Irvine
  摘要：The manipulation of light by means of materials with varying refractive index distributions is widespread among natural systems and modern technologies. However, understanding how animals leverage refractive index differences for dynamic color changes and then translating such insight into tunable optical devices remains challenging. We experimentally and computationally demonstrated that iridescent cells (iridophores) containing Bragg reflectors with sinusoidal-wave (rugate) refractive index ...
• The power of reinvention AI翻译
  作者：Moya, Ivan M.
• Let there be light: From passive agricultural sensing to active intervention AI翻译
  作者：Yin, Xiaobo
• National Academies adopts new business model amid financial storm AI翻译
  作者：Mervis, Jeffrey
• Spontaneous formation of urea from carbon dioxide and ammonia in aqueous droplets AI翻译
  作者：Mohajer, Mercede Azizbaig; Basuri, Pallab; Evdokimov, Andrei; David, Gregory; Zindel, Daniel; Miliordos, Evangelos; Signorell, Ruth
  作者单位：Swiss Federal Institutes of Technology Domain; ETH Zurich; Auburn University System; Auburn University
  摘要：Urea is a key molecule in the search for the origin of life and a basic chemical produced in large quantities by industry. Its formation from ammonia and carbon dioxide requires either high pressures and temperatures or, under milder conditions, catalysts or additional reagents. In this study, we observed the spontaneous formation of urea under ambient conditions from ammonia and carbon dioxide in the surface layer of aqueous droplets. Single, optically trapped droplets were probed by using Ra...
• Ten times faster is not 10 times better AI翻译
  作者：Nelson, Alondra
  作者单位：Institute for Advanced Study - USA
• Interplate slip before, during, and after the 2024 Mw 7 Hyuga-nada earthquake, southwest Japan AI翻译
  作者：Ozawa, Shinzaburo; Munekane, Hiroshi; Suito, Hisashi; Yarai, Hiroshi
  摘要：Using Global Navigation Satellite System data, we investigated the interplate slip before, during, and after the 2024 Hyuga-nada earthquake in Japan. Before the earthquake, a moment magnitude (Mw) 6.0 slow-slip event (SSE) was observed from late 2023 in a downdip extension of the mainshock. The coseismic slip was adjacent to the 1996 Hyuga-nada earthquake source. The afterslip resolved near the hypocenter area and in the downdip extension of the mainshock, reaching Mw 6.7 on 16 September 2024....
• Bespoke plant glycoconjugates for gut microbiota-mediated drug targeting AI翻译
  作者：Ma, Wei Jen; Wang, Changqing; Kothandapani, Jagatheeswaran; Luzentales-Simpson, Matthew; Menzies, Susan C.; Bescucci, Danisa M.; Lange, Maximo E.; Fraser, Alexander S. C.; Gusse, Jenny F.; House, Kathaleen E.; Moote, Paul E.; Xing, Xiaohui; Grondin, Julie M.; Hui, Benjamin Wei-Qiang; Clarke, Sandra T.; Shelton, Tara G.; Haskey, Natasha; Gibson, Deanna L.; Martens, Eric C.; Abbott, D. Wade; Inglis, G. Douglas; Sly, Laura M.; Brumer, Harry
  作者单位：University of British Columbia; University of British Columbia; BC Children's Hospital; University of British Columbia; University of British Columbia; Agriculture & Agri Food Canada; University of British Columbia; University of British Columbia Okanagan; University of Michigan System; University of Michigan
  摘要：The gut microbiota of mammals possess distinctive metabolic pathways with untapped therapeutic potential. Using molecular insights into dietary fiber metabolism by the human gut microbiota, we designed a targeted drug delivery system, called GlycoCaging, that is based on bespoke glycoconjugates of a complex plant oligosaccharide. GlycoCaging of exemplar anti-inflammatory drugs enabled release of active molecules triggered by specific glycosidases of autochthonous gut bacteria. GlycoCaging ensu...
• Migrating shallow slow slip on the Nankai Trough megathrust captured by borehole observatories AI翻译
  作者：Edgington, Joshua R.; Saffer, Demian M.; Williams, Charles A.
  作者单位：University of Texas System; University of Texas Austin; GNS Science - New Zealand
  摘要：Patterns of strain accumulation and release offshore in subduction zones are directly linked to the potential for shallow coseismic slip and tsunamigenesis, but these patterns remain elusive. In this work, we analyze formation pore pressure records from three offshore borehole observatories at the Nankai subduction zone, Honshu, Japan, to capture detailed slip-time histories of two slow slip events (SSEs) along the outermost reaches of the plate boundary. Slip initiates similar to 30 kilometer...
• Carbonyl-to-sulfur swap enabled by sequential double carbon-carbon bond activation AI翻译
  作者：Zhang, Zining; Dong, Guangbin
  作者单位：University of Chicago
  摘要：In drug development, replacement of a skeletal carbon with a sulfur atom can result in analogs of bioactive compounds with improved properties. Currently, the sulfur analogs are almost exclusively prepared by de novo synthesis; the existing approach to swap carbon with sulfur is inefficient and involves stoichiometric mercury reagents. In this study, we report a two-step carbonyl-to-sulfur (CO-to-S) atom swap approach, enabled by a rationally designed N '-alkyl-hydrazonamide (NAHA) reagent tha...