4results about How to "Point to clear" patented technology

The present invention relates to a liquid crystal composition. The liquid crystal composition comprises four compounds having different structural formulas and a chiral compound. The four compounds having different structural formulas are at least one compound selected from general formula I, at least one compound selected from general formula II, at least one compound selected from general formula III, and at least one compound selected from general formula IV, respectively. By optimizing the content of each component in the liquid crystal composition, a clearing point is improved while reducing a phase transition point of the N-TB. Also provided is a bistable liquid crystal dimming device prepared by applying the liquid crystal composition, which widens the working temperature range of the bistable liquid crystal dimming device, and improves the value of the bistable liquid crystal dimming device in practical applications.

The invention discloses a method for enhancing the synthetic ability of yeast total protein and dipeptide tripeptide. Relates to the technical field of synthetic biology and metabolic engineering. According to the invention, the saccharomyces cerevisiae engineering strain with high protein synthesis capability and high endogenous dipeptide and tripeptide accumulation level is successfully constructed. The metabonomics analysis reveals the unique peptide fragment accumulation spectrum, especially the generation of a large amount of lysine-rich tripeptide at the C terminal, and proposes a potential mechanism of metabolic pathway'bottleneck 'caused by peptidase activity down-regulation in combination with proteome data. The recombinant strain has important application potential in the fields of single-cell protein, functional peptide products and the like.

The present invention provides a stone removal device and a method for using the same, and belongs to the technical field of medical devices. The stone removal device includes an optical fiber, a basket structure, and a limiting assembly. The optical fiber is used to transmit laser light. The basket structure includes a plurality of basket connecting wires arranged around the optical fiber, and the proximal ends of all the basket connecting wires are fixed to the optical fiber, and the distal ends of all the basket connecting wires are connected to each other to form a basket body on the distal side of the optical fiber. The limiting assembly includes a limiting structure and a control member. The limiting structure is sleeved outside the optical fiber, the limiting structure is located on the proximal side of the basket body, the distal end of the control member is connected to the limiting structure, and the proximal end of the control member extends toward the proximal end of the optical fiber. The control member is used to control the expansion or retraction of the limiting structure on the optical fiber to increase or decrease the diameter of the limiting structure. The present application fixes the optical fiber to the instrument channel of the insertion part by setting a limiting structure, stabilizes the position of the optical fiber in the instrument channel, and improves the coaxiality of the optical fiber and the instrument channel.

This invention belongs to the field of polymer material preparation and nanomaterial processing technology, specifically relating to a method for preparing polyvinyl alcohol (PVA) nanoparticles. The method for preparing PVA nanoparticles provided by this invention includes the following steps: mixing PVA powder raw material with hot water to obtain a hot aqueous solution of PVA; adding the hot aqueous solution of PVA dropwise to pretreated acetone under stirring conditions to induce precipitation and obtain a suspension; performing solid-liquid separation on the suspension, and drying the resulting solid phase to obtain the PVA nanoparticles. This preparation method uses commercially available PVA as raw material and is simple, mild, and easily repeatable.