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Highlights d BsYetJ mediates Ca 2+ flux from the ER in permeabilized mammalian cells d The Ca 2+ -binding activity is sensitive to protons and other cations d The Asp171-Asp195 dyad controls pore opening and pHdependent Ca 2+ binding d Protonation of Asp171 leads to an open-state structure

We demonstrate dual-comb spectroscopy in the vicinity of 2 µm wavelength based on a single dual-wavelength dual-comb Thulium-doped fiber laser. The shared laser cavity ensures passively maintained mutual coherence between the two combs due to common mode environmental noise rejection. In a proof-of-principle experiment, the absorption characteristics caused by the water in the optical path that composes the dual-comb spectrometer are measured. The retrieved spectral positions of the water absorption dips match with the HITRAN database.

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Intelligently screening the passivation materials is critical to improving power conversion efficiency (PCE) of the perovskite solar cell (PSC), while it is still lacking. Herein, machine learning is employed to...