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Surface stress relief is often invoked as the driving force for surface reconstruction. The present ab initio total energy calculations show that it is not the case, at least for the missing row reconstruction undergone by the (110) surface of the face centered cubic transition metals. Instead, they show that the tendency to reconstruct or not is closely related to the sign and magnitude of the strain...
For cells, the growth of a dense array of branched actin filaments organized by the actin-related proteins 2 and 3 (Arp2/3) complex at the plasma membrane offers an explanation as to how movement is produced [1], and this arrangement is considered to be optimal for motility. Here, we challenged this assumption by using an in vitro system of polystyrene beads in cell extracts that contained a complex...
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