6659期

最新文章

• Maui's deadly blazes reveal a fire-prone Hawaii AI翻译
  作者：Rains, Molly
  摘要：Flammable, invasive grasses have changed the island landscape, say its shaken scientists
• Targeting cancer with molecular glues AI翻译
  作者：Liu, Jun O.
  作者单位：Johns Hopkins University; Johns Hopkins Medicine; Johns Hopkins University; Johns Hopkins Medicine; Johns Hopkins University; Johns Hopkins Medicine
• Universal theory of strange metals from spatially random interactions AI翻译
  作者：Patel, Aavishkar A.; Guo, Haoyu; Esterlis, Ilya; Sachdev, Subir
  作者单位：Simons Foundation; Flatiron Institute; University of California System; University of California Berkeley; Cornell University; Harvard University; University of California System; University of California Santa Barbara; University of Wisconsin System; University of Wisconsin Madison; Institute for Advanced Study - USA
  摘要：Strange metals-ubiquitous in correlated quantum materials-transport electrical charge at low temperatures but not by the individual electronic quasiparticle excitations, which carry charge in ordinary metals. In this work, we consider two-dimensional metals of fermions coupled to quantum critical scalars, the latter representing order parameters or fractionalized particles. We show that at low temperatures (T), such metals generically exhibit strange metal behavior with a T-linear resistivity ...
• A massive helium star with a sufficiently strong magnetic field to form a magnetar AI翻译
  作者：Shenar, Tomer; Wade, Gregg A.; Marchant, Pablo; Bagnulo, Stefano; Bodensteiner, Julia; Bowman, Dominic M.; Gilkis, Avishai; Langer, Norbert; Nicolas-Chene, Andre; Oskinova, Lidia; Van Reeth, Timothy; Sana, Hugues; St-Louis, Nicole; de Oliveira, Alexandre Soares; Todt, Helge; Toonen, Silvia
  作者单位：University of Amsterdam; Royal Military College - Canada; KU Leuven; European Southern Observatory; Tel Aviv University; University of Bonn; Max Planck Society; National Science Foundation (NSF); University of Potsdam; Universite de Montreal; Universidade do Vale do Paraiba; Consejo Superior de Investigaciones Cientificas (CSIC); CSIC - Centro de Astrobiologia (INTA)
  摘要：Magnetars are highly magnetized neutron stars, the formation mechanism of which is unknown. Hot helium-rich stars with spectra dominated by emission lines are known as Wolf-Rayet stars. We observed the binary system HD 45166 using spectropolarimetry and reanalyzed its orbit using archival data. We found that the system contains a Wolf-Rayet star with a mass of 2 solar masses and a magnetic field of 43 kilogauss. Stellar evolution calculations indicate that this component will explode as a supe...
• Israeli scientists speak out against 'destructive' policies AI翻译
  作者：Chabin, Michele
  摘要：Many fear erosion of academic freedom and loss of talent
• Bacteria stretch and bend oil to feed their appetite AI翻译
  作者：Mcgenity, Terry J.; Laissue, Pierre Philippe
  作者单位：University of Essex
  摘要：It is imperative to understand the fate of crude oil that escapes into the ocean to minimize its environmental, economic, and societal harm. Large amounts of crude oil enter the sea, as occurred this past month on a platform in the Gulf of Mexico. Oil does not easily mix with water, which can restrict oil degradation through microbes, a key pathway to remove hydrocarbons from the environment. However, turbulent seas and response measures, such as dispersant addition, generate smaller oil dropl...
• China leads in internal citations AI翻译
  作者：Brainard, Jeffrey
• Human POT1 protects the telomeric ds-ss DNA junction by capping the 5′ end of the chromosome AI翻译
  作者：Tesmer, Valerie M.; Brenner, Kirsten A.; Nandakumar, Jayakrishnan
  作者单位：University of Michigan System; University of Michigan
  摘要：Protection of telomeres 1 (POT1) is the 3 ' single-stranded overhang-binding telomeric protein that prevents an ataxia telangiectasia and Rad3-related (ATR) DNA damage response (DDR) at chromosome ends. What precludes the DDR machinery from accessing the telomeric double-stranded-single-stranded junction is unknown. We demonstrate that human POT1 binds this junction by recognizing the phosphorylated 5 ' end of the chromosome. High-resolution crystallographic structures reveal that the junction...
• Ligand-protected metal nanoclusters as low-loss, highly polarized emitters for optical waveguides AI翻译
  作者：Wang, Xiaojian; Yin, Bing; Jiang, Lirong; Yang, Cui; Liu, Ying; Zou, Gang; Chen, Shuang; Zhu, Manzhou
  作者单位：Anhui University; Chinese Academy of Sciences; University of Science & Technology of China, CAS
  摘要：Photoluminescent molecules and nanomaterials have potential applications as active waveguides, but such a use has often been limited by high optical losses and complex fabrication processes. We explored ligand-protected metal nanoclusters (LPMNCs), which can have strong, stable, and tunable emission, as waveguides. Two alloy LPMNCs, Pt1Ag18 and AuxAg19-x (7 <= x <= 9), were synthesized and structurally determined. Crystals of both exhibited excellent optical waveguide performance, with optical...