Abstract: The present invention provides a method for preparing a gallium oxide semiconductor structure and a gallium oxide semiconductor structure obtained thereby.

Abstract: A method and circuit for obtaining a capacitive feedback signal of a capacitive feedback micro torsion mirror are provided to solve the problem of poor stability of the capacitive feedback signals of the micro torsion mirror. First, a pulse signal is used as a driving signal to drive the capacitive feedback micro torsion mirror to vibrate; it is ensured that the micro torsion mirror may twist freely for at least 0.5 cycles during an interval of two adjacent sets of driving pulses; secondly, the capacitive feedback signal of the capacitive feedback micro torsion mirror is extracted, and converted into a voltage signal; then, the voltage signal is amplified; and finally extracted during the interval of the two adjacent sets of driving pulses, and taken as a real capacitive feedback signal. A carrier generation circuit and a detection circuit are omitted, and the influence of the carrier generation circuit and the detection circuit on a capacitive feedback signal is eliminated.

Abstract: The present invention provides amino acid sequences of engineered decarboxylase polypeptides that are useful for catalyzing the decarboxylation of L-aspartate to produce ?-alanine, and the preparation process of engineered decarboxylase polypeptides as well as reaction process under industrial-relevant conditions. The present disclosure also provides polynucleotide sequences encoding engineered decarboxylase polypeptides, engineered host cells capable of expressing engineered decarboxylase polypeptides, and methods of producing ?-alanine using the engineered cells. Compared to the wild-type decarboxylase, the engineered decarboxylase polypeptide provided by the invention has better activity and stability, and overcomes the inhibition by L-aspartic acid and/or ?-alanine. The use of the engineered polypeptides of the present invention for the preparation of ?-alanine results in higher unit activity, lower cost, and has good industrial application prospects.

Abstract: A method and circuit for obtaining a capacitive feedback signal of a capacitive feedback micro torsion mirror are provided to solve the problem of poor stability of the capacitive feedback signals of the micro torsion mirror. First, a pulse signal is used as a driving signal to drive the capacitive feedback micro torsion mirror to vibrate; it is ensured that the micro torsion mirror may twist freely for at least 0.5 cycles during an interval of two adjacent sets of driving pulses; secondly, the capacitive feedback signal of the capacitive feedback micro torsion mirror is extracted, and converted into a voltage signal; then, the voltage signal is amplified; and finally extracted during the interval of the two adjacent sets of driving pulses, and taken as a real capacitive feedback signal. A carrier generation circuit and a detection circuit are omitted, and the influence of the carrier generation circuit and the detection circuit on a capacitive feedback signal is eliminated.

Abstract: The present invention provides amino acid sequences of engineered decarboxylase polypeptides that are useful for catalyzing the decarboxylation of L-aspartate to produce ?-alanine, and the preparation process of engineered decarboxylase polypeptides as well as reaction process under industrial-relevant conditions. The present disclosure also provides polynucleotide sequences encoding engineered decarboxylase polypeptides, engineered host cells capable of expressing engineered decarboxylase polypeptides, and methods of producing ?-alanine using the engineered cells. Compared to the wild-type decarboxylase, the engineered decarboxylase polypeptide provided by the invention has better activity and stability, and overcomes the inhibition by L-aspartic acid and/or ?-alanine. The use of the engineered polypeptides of the present invention for the preparation of ?-alanine results in higher unit activity, lower cost, and has good industrial application prospects.