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. 2016 Jan 20;7:10212. doi: 10.1038/ncomms10212

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(a) Scheme of feedback control. The droplet-fusion control programme fluorescently monitors and classifies the current reaction state in the reactor (SSH, SSL and oscillation of pH). The droplet-fusion control programme compares the reaction state with a designated one; when they are different, the droplet-fusion control programme automatically changes q by changing T_j^set to obtain a reaction state closer to the designated one. (b) Time course of q (upper) and normalized fluorescence intensity (Norm. fl. int.; lower) during feedback control (designated period: 15 min). Initial condition q=0.215 (T_j=4.62 s). The change in q per step was 0.0165. (c) Long-term observation of oscillation after applying the feedback control in b (box indicated by dashed lines). The compositions of the solutions in the transporter and reactor are given in the Methods section.