3results about How to "Clean background" patented technology

The invention belongs to the field of biotechnology and enzymology, and particularly relates to a thermostable variant of MDH and application thereof. The amino acid sequence of the mutant is shown as any one of SEQ ID NO: 1 to SEQ ID NO: 23. The catalyst has a normal MDH catalysis function and shows high temperature stability. The thermal stability variant of MDH provided by the invention can be used for replacing traditional MDH to be applied to clinical diagnostic reagents, cold-chain transportation and low-temperature storage are avoided, the cost is reduced, and the shelf life is prolonged.

The application provides a tunnel lining concrete evaluation method and system, and belongs to the technical field of tunnel lining quality detection. The method comprises the following steps: a data acquisition and matrix construction step: obtaining full polarization data and establishing a complex domain scattering matrix of each sampling point; a spatial phase locking step: constructing a spatial phase locking loop, tracking the spatial phase of the steel bar in real time, determining the locking state according to the phase difference and determining the steel bar high-weight prediction area; a polarization feature calculation step: in the steel bar high-weight prediction area, performing eigenvalue decomposition on the local covariance matrix, calculating the polarization entropy and the average scattering angle; an adaptive projection stripping step: generating an adaptive gain factor and adjusting the projection strength of the projection matrix, performing projection transformation on the original polarization vector to obtain a residual signal; and an evaluation step: reconstructing a defect signal based on the residual signal to evaluate the quality of the tunnel concrete lining. The scheme can improve the accuracy of tunnel concrete lining quality evaluation.

The application relates to a characteristic chromatogram of Qinshi Jiedu granules and a construction method and application thereof, and belongs to the technical field of quality detection of traditional Chinese medicine preparations. High performance liquid chromatography is adopted; test product solution, control product solution and each single medicine control solution are respectively injected into a high performance liquid chromatograph for determination; a chromatogram is recorded; a characteristic chromatogram of the Qinshi Jiedu granules is established under the same chromatographic condition; 14 characteristic peaks are calibrated; and quality detection is carried out on the Qinshi Jiedu granules. The characteristic chromatogram of the Qinshi Jiedu granules established based on the high performance liquid chromatography technology can comprehensively, systematically and objectively evaluate the quality of the Qinshi Jiedu granules.