Science

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• Florida plan to nix vaccine mandates raises alarm AI翻译
  作者：Cohen, Jon
• Harvard court victory leaves scientists feeling vindicated but uncertain AI翻译
  作者：Jacobs, Phie
• Gene flow stops sooner in plants than in animals AI翻译
  作者：Brandvain, Yaniv
  作者单位：University of Minnesota System; University of Minnesota Twin Cities
• In Other Journals AI翻译
  作者：Ray, L. Bryan; Vignieri, Sacha; Smith, Jesse; Seale, Madeleine; Wible, Brad; Jiang, Di; Stajic, Jelena
• Directly observing replica symmetry breaking in a vector quantum-optical spin glass AI翻译
  作者：Kroeze, Ronen M.; Marsh, Brendan P.; Atri Schuller, David; Hunt, Henry S.; Bourzutschky, Alexander N.; Winer, Michael; Gopalakrishnan, Sarang; Keeling, Jonathan; Lev, Benjamin L.
  作者单位：Stanford University; Stanford University; Stanford University; University System of Maryland; University of Maryland College Park; Princeton University; University of St Andrews
  摘要：Spin glasses are quintessential examples of complex matter. Although their ordering lacks complete theoretical understanding, abstract models of spin glasses inform problems in other fields, such as combinatorial optimization and artificial intelligence-where they form a mathematical basis for neural network computing. We demonstrate the ability to realize a spin glass of a distinct driven-dissipative and vector form. By microscopically visualizing its glassy spin states, the technique allows ...
• Dual-cycle CO2 fixation enhances growth and lipid synthesis in Arabidopsis thaliana AI翻译
  作者：Lu, Kuan-Jen; Hsu, Chia-Wei; Jane, Wann-Neng; Peng, Mien-Hao; Chou, Ya-Wen; Huang, Pin-Hsuan; Yeh, Kuo-Chen; Wu, Shu-Hsing; Liao, James C.
  作者单位：Academia Sinica - Taiwan; Academia Sinica - Taiwan; Academia Sinica - Taiwan
  摘要：Carbon fixation through the Calvin-Benson-Bassham (CBB) cycle accounts for the majority of carbon dioxide (CO2) uptake from the atmosphere. The CBB cycle generates C3 carbohydrates but is inefficient at producing acetyl-coenzyme A (CoA) (C2), which is the universal precursor for synthesizing lipids. In this work, we introduced in Arabidopsis thaliana a new-to-nature CO2 fixing cycle, malyl-CoA-glycerate (McG) cycle, which together with the CBB cycle forms a dual-cycle CO2 fixation system. This...
• Structure and function of a huge photosystem I-fucoxanthin chlorophyll supercomplex from a coccolithophore AI翻译
  作者：Shen, Lili; Ren, Fei; Wang, Yin-Chu; Li, Zhenhua; Zheng, Mengyuan; Li, Xiaoyi; Fan, Wenzheng; Yang, Yanyan; Sang, Min; Liu, Cheng; Han, Guangye; Qin, Song; Fan, Jianhua; Tian, Lijin; Kuang, Tingyun; Shen, Jian-Ren; Wang, Wenda
  作者单位：Chinese Academy of Sciences; Chinese Academy of Sciences; University of Chinese Academy of Sciences, CAS; Chinese Academy of Sciences; Yantai Institute of Coastal Zone Research, CAS; Shihezi University; Okayama University
  摘要：Photosystem I (PSI) is a pigment-protein complex, which converts light energy into chemical energy in photosynthesis. Among photosynthetic organisms, PSI-LHC (light-harvesting complex) structures exhibit substantial differences in their sizes, reflecting adaptation to different light environments. Here we report the structure of a PSI-fucoxanthin chlorophyll a/c binding protein (FCPI) supercomplex from the coccolithophore Emiliania huxleyi (Eh) at 2.79-angstrom resolution by cryo-electron micr...
• Unburden American science AI翻译
  作者：Leshner, Alan I.; Helman, Alex M.
  作者单位：National Academies of Sciences, Engineering & Medicine
• Oxytocin signaling regulates maternally directed behavior during early life AI翻译
  作者：Zelmanoff, Daniel D.; Bornstein, Rebecca; Kaufman, Menachem; Dine, Julien; Wietek, Jonas; Litvin, Anna; Abraham, Shaked; Cohen, Savanna; Atzmon, Ayelet; Porat, Ido; Yizhar, Ofer
  作者单位：Weizmann Institute of Science; Weizmann Institute of Science; Boehringer Ingelheim; Free University of Berlin; Humboldt University of Berlin; Charite Universitatsmedizin Berlin; Free University of Berlin; Humboldt University of Berlin
  摘要：Oxytocin is essential in shaping social behavior across the lifespan. Although the role of oxytocin signaling in parental care has been widely investigated, little is known about its function in social behavior during early life. We studied the role of oxytocin in mouse pup social behavior during acute separation from the mother as well as upon reunion. The activity of oxytocin neurons was increased by acute maternal separation. Behaviorally, maternally separated pups emitted more ultrasonic v...
• A main-group metal carbonyl complex: Structure and isomerization to a carbene-stabilized tin atom AI翻译
  作者：Dietz, Maximilian; Protchenko, Andrey V.; Crumpton, Agamemnon E.; Karwasara, Surendar; Roy, Matthew M. D.; Stewart-Moreno, James; Timmel, Christiane; Aldridge, Simon
  作者单位：University of Oxford
  摘要：In contrast to transition elements, s- and p-block metal compounds that coordinate carbon monoxide (CO) under near-ambient conditions are elusive. Here, we report an isolable, crystalline main-group metal carbonyl complex and its isomerization to a carbene-stabilized metal atom. The stannylene (Boryl)2Sn [where Boryl is B(NDippCH)2] coordinates CO reversibly, affording an isolable adduct below 0 degrees C, which was characterized by x-ray crystallography. This complex rearranges at temperature...