6712期

最新文章

• Columbia's record research gift AI翻译
  作者：Brainard, Jeffrey
• Stereodivergent access to non-natural α-amino acids via enantio- and Z/E-selective catalysis AI翻译
  作者：Li, Panpan; Zheng, En; Li, Guanlin; Luo, Yicong; Huo, Xiaohong; Ma, Shengming; Zhang, Wanbin
  作者单位：Shanghai Jiao Tong University; Chinese Academy of Sciences; University of Chinese Academy of Sciences, CAS; Shanghai Institute of Organic Chemistry, CAS; Fudan University
  摘要：The precise control of Z and E configurations of the carbon-carbon double bond in alkene synthesis has long been a fundamental challenge in synthetic chemistry, even more pronounced when simultaneously striving to achieve enantioselectivity [(Z,R), (Z,S), (E,R), (E,S)]. Moreover, enantiopure non-natural alpha-amino acids are highly sought after in organic and medicinal chemistry. In this study, we report a ligand-controlled stereodivergent synthesis of non-natural alpha-quaternary amino acids ...
• Architectural traditions in the structures built by cooperative weaver birds AI翻译
  作者：Tello-Ramos, Maria C.; Harper, Lucy; Tortora-Brayda, Isabella; Guillette, Lauren M.; Capilla-Lasheras, Pablo; Harrison, Xavier A.; Young, Andrew J.; Healy, Susan D.
  作者单位：University of St Andrews; University of Alberta; University of Exeter; University of Glasgow; Swiss Ornithological Institute
  摘要：Humans cooperate to build complex structures with culture-specific architectural styles. However, they are not the only animals to build complex structures nor to have culture. We show that social groups of white-browed sparrow weavers (Plocepasser mahali) build structures (nests for breeding and multiple single-occupant roosts for sleeping) that differ architecturally among groups. Morphological differences are consistent across years and are clear even among groups with territories a few met...
• Protect Oman's Masirah Island Arabian gazelle AI翻译
  作者：Al Naabi, Asila S.; Al Kindi, Bushra A.; Leduc, Antoine O. H. C.
  作者单位：Sultan Qaboos University
• New MIT students' diversity falls AI翻译
  作者：Brainard, Jeffrey
• Hot days or heat waves: A split over how to count heat deaths AI翻译
  作者：La, Vivian
  摘要：Focusing on temperature extremes can galvanize policy changes but risks undercounting
• Grain boundaries are Brownian ratchets AI翻译
  作者：Qiu, Caihao; Punke, Maik; Tian, Yuan; Han, Ying; Wang, Siqi; Su, Yishi; Salvalaglio, Marco; Pan, Xiaoqing; Srolovitz, David J.; Han, Jian
  作者单位：City University of Hong Kong; Technische Universitat Dresden; University of California System; University of California Irvine; Shanghai Jiao Tong University; Technische Universitat Dresden; University of California System; University of California Irvine; University of Hong Kong; University of Hong Kong
  摘要：We demonstrate that grain boundaries (GBs) behave as Brownian ratchets, exhibiting direction-dependent mobilities and unidirectional motion under oscillatory driving forces or cyclic thermal annealing. We observed these phenomena for nearly all nonsymmetric GBs but not for symmetric ones. Our observations build on molecular dynamics and phase-field crystal simulations for a wide range of GB types and driving forces in both bicrystal and polycrystalline microstructures. We corroborate these sim...
• A unified flow strategy for the preparation and use of trifluoromethyl-heteroatom anions AI翻译
  作者：Spennacchio, Mauro; Bernus, Miguel; Stanic, Jelena; Mazzarella, Daniele; Colella, Marco; Douglas, James J.; Boutureira, Omar; Noel, Timothy
  作者单位：University of Amsterdam; Universita degli Studi di Bari Aldo Moro; Universitat Rovira i Virgili; University of Padua; AstraZeneca
  摘要：The trifluoromethyl group (CF3) is a key functionality in pharmaceutical and agrochemical development, greatly enhancing the efficacy and properties of resulting compounds. However, attaching the CF(3 )group to heteroatoms such as sulfur, oxygen, and nitrogen poses challenges because of the lack of general synthetic methods and reliance on bespoke reagents. Here, we present a modular flow platform that streamlines the synthesis of heteroatom-CF3 motifs. Our method uses readily available organi...
• The marine biodiversity impact of the Late Miocene Mediterranean salinity crisis AI翻译
  作者：Agiadi, Konstantina; Hohmann, Niklas; Gliozzi, Elsa; Thivaiou, Danae; Bosellini, Francesca R.; Taviani, Marco; Bianucci, Giovanni; Collareta, Alberto; Londeix, Laurent; Faranda, Costanza; Bulian, Francesca; Koskeridou, Efterpi; Lozar, Francesca; Mancini, Alan Maria; Dominici, Stefano; Moissette, Pierre; Campos, Ildefonso Bajo; Borghi, Enrico; Iliopoulos, George; Antonarakou, Assimina; Kontakiotis, George; Besiou, Evangelia; Zarkogiannis, Stergios D.; Harzhauser, Mathias; Sierro, Francisco Javier; Coll, Marta; Vasiliev, Iuliana; Camerlenghi, Angelo; Garcia-Castellanos, Daniel
  作者单位：University of Vienna; Utrecht University; University of Warsaw; Roma Tre University; National & Kapodistrian University of Athens; Universita di Modena e Reggio Emilia; Consiglio Nazionale delle Ricerche (CNR); Istituto di Scienze Marine (ISMAR-CNR); Stazione Zoologica Anton Dohrn; University of Pisa; Centre National de la Recherche Scientifique (CNRS); CNRS - National Institute for Earth Sciences & Astronomy (INSU); Universite de Bordeaux; University of Salamanca; University of Groningen; University of Turin; Marche Polytechnic University; University of Florence; University of Patras; University of Oxford; Consejo Superior de Investigaciones Cientificas (CSIC); CSIC - Centro Mediterraneo de Investigaciones Marinas y Ambientales (CMIMA); CSIC - Instituto de Ciencias del Mar (ICM); Istituto Nazionale di Oceanografia e di Geofisica Sperimentale
  摘要：Massive salt accumulations, or salt giants, have formed in highly restricted marine basins throughout geological history, but their impact on biodiversity has been only patchily studied. The salt giant in the Mediterranean Sea formed as a result of the restriction of its gateway to the Atlantic during the Messinian Salinity Crisis (MSC) 5.97 to 5.33 million years ago. Here, we quantify the biodiversity changes associated with the MSC based on a compilation of the Mediterranean fossil record. W...
• Moroccan cannabis farms threaten biodiversity AI翻译
  作者：Chergui, Brahim; Fahd, Soumia; Santos, Xavier; Pausas, Juli G.
  作者单位：Abdelmalek Essaadi University of Tetouan; Universidade do Porto; Consejo Superior de Investigaciones Cientificas (CSIC); University of Valencia; CSIC-GV-UV - Centro de Investigaciones sobre Desertificacion (CIDE)