Supportinginformation and the ORCID identification number(s) for the author(s) of this article can be found under: https://doi.

Twofold unsymmetrical C−Si bond bifunctionalization of 2,6-di(trimethylsilyl) benzyl alcohols has been achieved in one pot via sequential [1,4]-Csp 2 to O-silyl migration. The hydroxyl group functions as an "on−off−on" switch to control two successive silyl migrations, and 4,7dimethyl-o-phenanthroline ligand favors cleavage of the endocyclic C−Si bond. Diverse Csp 3 /Csp 3 or Csp 2 /Csp 3 electrophiles can be installed at the 2-and 6-positions. This approach was used to chemoselectively functionalize the three C−Si bonds of 2,4,6-tri(trimethylsilyl) benzyl alcohol, transforming it into isochroman derivatives. The approach even works as a five-component reaction to construct complex symmetric structures.

Supportinginformation and the ORCID identification number(s) for the author(s) of this article can be found under: https://doi.

To achieve a wide range and high accuracy detection of the vacuum level, for example, in an encapsulated vacuum microcavity, a composite-type MEMS Pirani gauge has been designed and fabricated. The Pirani gauge consists of two gauges of different sizes connected in series, with one gauge having a larger heat-sensitive area and a larger air gap for extending the lower measurable limit of pressure (i.e., the high vacuum end) and the other gauge having a smaller heat-sensitive area and a smaller air gap for extending the upper measurable limit. The high-resistivity titanium metal was chosen as the thermistor; SiNx was chosen as the dielectric layer, considering the factors relevant to simulation and manufacturing. By simulation using COMSOL Multiphysics and NI Multisim, a range of measurement of 2 × 10−2 to 2 × 105 Pa and a sensitivity of 52.4 mV/lgPa were obtained in an N2 environment. The performance of the fabricated Pirani gauge was evaluated by using an in-house made vacuum test system. In the test, the actual points of measurement range from 6.6 × 10−2 to 1.12×105 Pa, and the highest sensitivity is up to 457.6 mV/lgPa. The experimental results are better in the range of measurement, sensitivity, and accuracy than the simulation results. The Pirani gauge proposed in this study is simple in structure, easy to manufacture, and suitable for integration with other MEMS devices in a microcavity to monitor the vacuum level therein.

A global gene expression analysis of S. putrefaciens CN32 cells within the diffusion layer of the microbial fuel cell anode with surface controlled reaction reveals an electrical tension-triggered conversion of anaerobic to aerobic respiration, which represents the nature of the biofilm.