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Nucleic acid‐functionalized polyacrylamide chains that are cooperatively cross‐linked by i‐motif and nucleic acid duplex units yield, at pH 5.0, DNA hydrogels exhibiting shape‐memory properties. Separation of the i‐motif units at pH 8.0 dissolves the hydrogel into a quasi‐liquid phase. The residual duplex units provide, however, a memory code in the quasi‐liquid allowing the regeneration of the hydrogel...
Mimicking cellular transformations and signal transduction pathways by means of biocatalytic cascades proceeding in organized media is a scientific challenge. We describe two DNA machines that enable the “ON/OFF” switchable activation and deactivation of three‐component biocatalytic cascades. One system consists of a reconfigurable DNA tweezers‐type structure, whereas in the second system the catalytic...
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