6796期

最新文章

• Truck-size octopuses stalked Cretaceous seas AI翻译
  作者：Jacobs, Phie
• The EU's cryosphere biodiversity blind spot AI翻译
  作者：Gobbi, Mauro; Valle, Barbara; Rivalta, Virginia Toscano; Caccianiga, Marco; Lencioni, Valeria; Ambrosini, Roberto; Ficetola, Gentile F.
  作者单位：University of Siena; National Biodiversity Future Center; University of Milan; University of Milan; University of Milan; Universidade Estadual Paulista
• [Os(η5-B5H10)2]: A carbon-free analog of ferrocene AI翻译
  作者：Mohapatra, Stutee; Saha, Suvam; Joshi, Gaurav; Gupta, Urvashi; Patel, Deepak Kumar; Jemmis, Eluvathingal D.; Ghosh, Sundargopal
  作者单位：Indian Institute of Technology System (IIT System); Indian Institute of Technology (IIT) - Madras; Indian Institute of Science (IISC) - Bangalore
  摘要：The synthesis of a carbon-free analog of ferrocene has been a long-standing goal in inorganic chemistry. We report here the preparation and crystallographic characterization of the carbon-free sandwich complex [Os(eta 5-B5H10)2], which is qualitatively similar to ferrocene in structure and bonding. The metal-ring bonding is much stronger in [Os(eta 5-B5H10)2], owing to rehybridization of the pi molecular orbitals brought in by the bridging B-H-B hydrogens and the bent B-Ht bonds of the larger ...
• A cell-nonautonomous heme acquisition pathway enables erythroid hemoglobinization under stress AI翻译
  作者：Belot, Audrey; Rock, Andrew; Dutt, Sohini; Haemmerle, Gia; Maros, Amaury; Yuan, Xiaojing; Otsuru, Satoru; Bodine, David; Hamza, Iqbal
  作者单位：University System of Maryland; University of Maryland Baltimore; University System of Maryland; University of Maryland College Park; University System of Maryland; University of Maryland Baltimore; University System of Maryland; University of Maryland Baltimore; National Institutes of Health (NIH) - USA; NIH National Human Genome Research Institute (NHGRI)
  摘要：Heme, an iron-containing cofactor, is synthesized in mitochondria by an eight-enzyme pathway. Although cells were thought to manage heme autonomously, more than 1000 proteins contribute to its production, transport, and regulation. During terminal erythroid differentiation, mitochondria are discarded, yet hemoglobin production continues, which implies a cell-nonautonomous heme supply. We show that, under stress, erythroblasts import heme through the permease heme-responsive gene 1 (HRG1), whic...
• A silver rush in organic chemistry A silver complex catalyzes formation of carbon-nitrogen bonds in compounds of industrial interest AI翻译
  作者：Hrdina, Radim
  作者单位：Charles University Prague
• The heart puts pressure on cancer growth Mechanical forces in the heart prevent tumor expansion in mice AI翻译
  作者：Paltzer, Wyatt G.; Martin, James F.
  作者单位：Baylor College of Medicine; Texas Heart Institute; Baylor College of Medicine; Baylor College of Medicine; Texas Heart Institute; Texas Heart Institute; Baylor College of Medicine
• Chiral S(VI) platform unifies selective C-H amination of complex molecules and alkane feedstocks AI翻译
  作者：Trinh, Tuan Anh; Hu, Derek B.; Kenny, Anna J.; Warrington, Ethan M.; Cherempei, Stanislav; Guzei, Ilia A.; Schomaker, Jennifer M.
  作者单位：University of Wisconsin System; University of Wisconsin Madison
  摘要：Complex molecules and simple alkanes pose distinct challenges for catalyst-controlled carbon-hydrogen (C-H) functionalizations. Whereas densely functionalized scaffolds require precise targeting among multiple reactive sites while tolerating sensitive functionalities, unactivated substrates that lack directing groups require selective activation of exceptionally inert, nearly identical C-H bonds. In this work, we addressed both challenges by repurposing a classic chiral auxiliary into a unifie...
• Malaria may cause long-term brain deficits, study shows AI翻译
  作者：Vogel, Gretchen
• An unrecognized mode of small particles in the lower stratosphere AI翻译
  作者：Lyu, Ming; Ahern, Adam T.; Schill, Gregory P.; Lawler, Michael J.; Murphy, Daniel M.; Taylor, Samuel J.; Fodel, Anthony; Abou-Ghanem, Maya; Gurganus, Colin; Zhu, Yunqian; Tilmes, Simone; Ray, Eric; Thornberry, Troy D.; Gao, Ru-Shan; Hintsa, Eric J.; Moore, Fred; Dutton, Geoff; Nance, David; Hall, Brad; Rollins, Andrew W.; Waxman, Eleanor M.; Zuraski, Kristen; Diskin, Glenn S.; Choi, Yonghoon; Pierce, R. Bradley; Weinzierl, Bernadett; Kuderna, Florian; Dollner, Maximilian; Jensen, Eric; Brock, Charles A.
  作者单位：University of Colorado System; University of Colorado Boulder; National Oceanic Atmospheric Admin (NOAA) - USA; National Oceanic Atmospheric Admin (NOAA) - USA; National Aeronautics & Space Administration (NASA); NASA Langley Research Center; Analytical Mechanics Associates; University of Wisconsin System; University of Wisconsin Madison; University of Wisconsin System; University of Wisconsin Madison; University of Vienna
  摘要：Analysis of recent in situ data reveals a persistent mode of organic-rich aerosol particles in the stratosphere below 19 kilometers at nitrous oxide (N2O) > 270 parts per billion by volume, with a number geometric mean diameter of similar to 0.03 to 0.11 mu m (0.08 to 0.2 mu m in surface and 0.11 to 0.3 mu m in volume). This mode, composed mostly of organic-rich particles transported from the troposphere, is poorly sensed by satellites and most balloon-borne optical measurements but dominates ...
• Resolving the radiation risk debate AI翻译
  作者：Caffrey, Emily A.; Ulsh, Brant A.
  作者单位：University of Alabama System; University of Alabama Birmingham