58results about How to "Has a clearing effect" patented technology

The invention provides a preparation method of a plant unbleached impregnated specimen. In the invention, the fixative of the operation process adopts a composite biocidal formula and simplifies the fixing and biocidal procedures, and the operation is simple; and the preservation solution for preserving the plant specimens adopts nontoxic and inexpensive biological extracts, such as garlic extract, ginger extract, carboxylation chitosan and the like, and solves the problem of environmental pollution when preserving and storing the plant specimens. The preparation method of invention can be applied to the impregnation and preservation of monochromatic plants, such as green, yellow, red, white plants and the like, multi-color plants and whole plant specimen, and provides a novel way for preparing the plant unbleached impregnated specimens.

A synergistic method for metamorphism and microalloying of a hypoeutectic casting Al-Si alloy comprises: melting the hypoeutectic casting Al-Si alloy, adding a refining agent thereto for degassing and slag removal, adding rare earth elemental La, settling and maintaining at a certain temperature, further adding elemental Mg, settling and maintaining at a certain temperature, and finally casting at a certain temperature. By means of the metamorphizing action of La and Mg and the mutual promotion of metamorphism of these two elements, favorable metamorphism of the Al-Si alloy can be achieved. At the same time, La and Mg as microalloying elements can strengthen the Al-Si alloy, improving alloy performance. In addition, for an Al alloy melt, the method includes dehydrogenation and degassing, reducing oxide inclusion, and purifying the melt, thereby improving the alloy structure and enhancing the mechanical performance thereof.

The invention discloses a preparation method of plant polyprenol with bacteriostatic and antioxidant activity and a hydrogenated derivative thereof, which comprises the following steps of: taking gingko, pine needles and folium mori as raw materials, extracting a polyprenol lipid ointment through a non-polar solvent, including with a filler in urea alcohol solution, crystallizing, preparing a polyprenol type lipid urea inclusion compound and purifying polyprenol lipid through column chromatography; adding into 5-40 percent by weight of caustic soda solution for saponification reaction and preparing more than 95 percent by weight of polyprenol; adding a catalyst in methylene dichloride-methanol solution and ensuring that the mass ratio of the polyprenol to the catalyst is 80-200:1, the reaction pressure is 8-20 MPa, the reaction time is 18-48 hours, and the reaction temperature is 10-50 DEG C; and after reaction, filtering and concentrating under vacuum, wherein a concentrate is a polyprenol hydrogenated derivative. The polyprenol and the hydrogenated derivative thereof prepared by the method play roles in restraining staphylococcus aureus (Sa.), escherichia coli (Ec.), bacillus subtilis and salmonella and clearing superoxide free radicals and hydroxyl free radicals.