In this issue, B. D. Freeman et al. review the surface modification of water purification membranes. What are the common techniques used to modify membrane surfaces? The Highlight deals with polyketide synthase modules (A. T. Keatinge-Clay).

In the Communications section, J. Zeng et al. analyze the dependence of the activity of supported rhodium catalysts on the highest occupied state of single Rh atoms (see picture). U. H. F. Bunz et al. describe cell fixation by light-triggered release of glutaraldehyde, and K. Y. Amsharov et al. succeeded in the synthesis of rationally halogenated buckybowls by chemoselective aromatic C–F bond activation.

• Angewandte Chemie 17/2017: Purification,
  Angew. Chem. Int. Ed. 2017, 56 (17).