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  • Ring-closing metathesis is a widely used chemical transformation that can generate organic macrocycle compounds; here, an approach is described by which the E-stereoisomer of a macrocycle is generated selectively, exemplified by synthesizing the antibiotic recifeolide and the anti-cancer drug pacritinib.

    • Xiao Shen
    • Thach T. Nguyen
    • Amir H. Hoveyda
    Letter
  • The mechanism of hydrogen spillover is described using a precisely nanofabricated model system, explaining why it is slower on an aluminum oxide catalyst support than on a titanium oxide catalyst support.

    • Waiz Karim
    • Clelia Spreafico
    • Jeroen A. van Bokhoven
    Letter
  • Subarcsecond localization of the repeating fast radio burst FRB 121102 shows that its source is co-located with a faint galaxy with a low-luminosity active galactic nucleus, or a previously unknown type of extragalactic source.

    • S. Chatterjee
    • C. J. Law
    • H. J. van Langevelde
    Letter
  • The chimaeroids are one of the four principal divisions of the living jawed vertebrates and their evolutionary origins have been hard to discern; here, the study of a skull of the extinct shark Dwykaselachus shows that the chimaeroids nest among the once fairly common and widespread symmoriiforms.

    • Michael I. Coates
    • Robert W. Gess
    • Kristen Tietjen
    Letter
  • Structural differences in 40- and 42-residue-long amyloid-β fibrils seeded in vitro from the cortical tissue of patients with different clinical subtypes of Alzheimer’s disease suggest that different fibril structures form in different disease variants and with different peptide lengths.

    • Wei Qiang
    • Wai-Ming Yau
    • Robert Tycko
    Letter