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This self-assembling structure has an interior cavity about 32 Å in diameter. It consists of 24 palladium ions, each of which is coordinated by 4 nitrogens, which are part of 48 dipyridylthiophene molecules. Such synthetic nano-spheres can be functionalized to create synthetic receptors and nanoreactors. Potential applications in sensing, catalysis, and drug delivery are being explored.

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F Wang, Y Gu, JP O'Brien, SM Yi, SE Yalcin, V Srikanth, C Shen, D Vu, NL Ing, AI Hochbaum, EH Egelman, NS Malvankar. Cell 2019 doi: 10.1016/j.cell.2019.03.029
Bacteria living in anaerobic environments (no oxygen) need alternative electron acceptors in order to get energy from their food. An acceptor abundant in the earth's crust is red iron oxide ("rust"), which gets reduced to black iron oxide (magnetite). Many bacteria, such as Geobacter, get their metabolic energy by transferring electrons to acceptors that are multiple cell diameters distant, using protein nanowires. These were long thought to be pili. But when the structure of the nanowires was solved in 2019, to everyone's surprise, they turned out to be unprecedented linear polymers of multi-heme cytochromes. The hemes form an electrically conductive chain in the cores of these nanowires.

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by Angel Herráez
Side-by-side display of dihedral angles in a 3D model of a tripeptide and its Ramachandran plot. Users can interact with any of them and the other will change accordingly. Includes animated rotations with display of clashes.

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