Abstract: Disclosed is an application of methioninase gene therapy in the treatment of a malignant tumor. In the gene therapy, a virus is used as a vector to insert an exogenous methioninase gene to constitute a methioninase expression system inside a tumor, thus providing an endogenous mechanism for further consumption of methionine. In vitro cytology experiments indicate that the methioninase gene therapy significantly reduces the level of intracellular methionine, effectively inhibits the proliferation of tumor cells, and can be used in an application in preparing a drug for the targeted treatment of a malignant tumor.

Abstract: Wave-absorbing material powder of the present invention has oxidation resistance and salt fog resistance, which includes an iron-containing wave-absorbing material powder, and a metal oxide ceramic layer and a metal phosphate layer sequentially coated on an outside of the iron-containing wave-absorbing material powder from the inside to the outside. A method for preparing the wave-absorbing material powder includes using atomic layer deposition to coat the iron-containing wave absorbing material powder with a metal oxide ceramic coating, and then adopting the atomic layer deposition to coat the metal oxide ceramic coating with a metal phosphate layer; repeating the above steps to form an alternating nano-stack of the metal oxide ceramic coating and the metal phosphate layer outside the iron-containing absorbing material powder; and finally performing a high-temperature annealing treatment.

Abstract: Disclosed in the present invention are a preparation method for a graphene oxide fiber, and fiber obtained thereby. A polyelectrolyte is prepared into a spinning stock solution by means of a wet spinning method, graphene oxide is added in a coagulation tank to serve as a coagulation bath, the spinning stock solution is injected into the coagulation bath, a diffusion reaction is carried out, and winding, washing and drying are carried out to obtain the graphene oxide fiber; the preparation method has the advantages that equipment is simple, the costs are low, the spinnability is good, and the method is suitable for large-scale production; moreover, the prepared fiber has multiple layers of fiber walls; the fiber has good tensile strength and a super-high specific surface area and is widely applied to the fields of catalysis, adsorption, flexible sensors, thermal preservation and insulation materials and tissue engineering.

Abstract: The application provides a method for preparing rubusoside comprising steps of raw material crushing, flash extraction, double centrifugations, macroporous resin purification, desorption, enzymatic hydrolysis, organic film decoloring, concentration, crystallization and drying. The application optimizes the quality control of key process such as extraction, separation, purification and decolorization, and can obtain the rubusoside product with purity more than 99%, and the product is white, no bitterness, less solvent residue, no pesticide residue, and stable quality.

Abstract: The application provides a method for preparing betanin comprising steps of raw material crushing, flash extraction, double centrifugations, macroporous resin purification, desorption, enzymatic hydrolysis, organic film decoloring, concentration, crystallization and drying. The application optimizes the quality control of key process such as extraction, separation, purification and decolorization, and can obtain the betanin product with purity more than 99%, and the product is white, no bitterness, less solvent residue, no pesticide residue, and stable quality.