54results about How to "Clear molecular structure" patented technology

The purpose of this invention is to solve the problems reported in the literature that the coordination polymer catalyst has low activity in the process of selective oxidation of benzyl hydrocarbons. Provided are a synthetically recoverable catalyst and a preparation method thereof, capable of achieving the goal of selective oxidation of benzyl hydrocarbon molecules. The design concept of the present invention is as follows: carbonyl diimidazole can be hydrolyzed in water, and then Cu is further reacted with polynitrogen ligand imidazole to construct a metal complex, and an imidazole copper catalyst is synthesized. Metallic Cu catalysts with well-defined structures were applied to the selective catalytic oxidation of benzylic hydrocarbons in order to achieve high conversion and high selectivity.

The invention discloses a novel polysaccharide antibacterial mouthwash and a preparation method thereof. The novel polysaccharide antibacterial mouthwash comprises the active ingredients of carboxymethyl chitosan and propolis and further comprises a Chinese herbal medicine concentrate, sodium alginate, oleum menthae, a pH modifier, ethanol and purified water. The preparation method comprises the following steps: quantitatively adding carboxymethyl chitosan and a propolis and ethanol solution, and heating for dissolution; after the solution is cooled down, adding the Chinese herbal medicine concentrate, sodium alginate, oleum menthae and the pH modifier, supplementing purified water to obtain the total amount, and obtaining the novel polysaccharide antibacterial mouthwash after measuring the pH value. The novel polysaccharide antibacterial mouthwash has the effects of cleaning the oral cavity and resisting bacteria to protect teeth, meanwhile, reduces the allergy risk caused by propolis, has a very unique Chinese herbal medicine fragrance, is added with no synthetic essences, is safer and more healthy, is simple in preparation method, low in cost, lasting and effective in antibacterial effect, free from toxic and side effects on a human body and comfortable in taste.

The invention relates to spermine-modified pullulan as an immunopotentiator. Specifically, a spermine molecule is coupled to a hydroxyl group or a C framework of the pullulan in the spermine-modifiedpullulan; the intake yield of the spermine molecule is 1%-90%, especially 10%-30%. In another aspect, a composition containing the spermine-modified pullulan and a purpose of the composition are provided.

The invention discloses a combined medicine for treating tumors. The combined medicine is prepared from unit preparations of an arsenic compound solution and a brazilin compound with different specifications, wherein the arsenic compound solution is prepared by the following steps: adding As2O3 powder into aseptic deionized water to obtain a suspension liquid, and dripping a NaOH solution into the suspension liquid until powder is completely dissolved. The brazilin compound consists of brazilin and brazilein. According to the combined medicine, an arsenic compound and a brazilin compound are combined, so that the curative effect of the arsenic compound can be improved, the dosage and corresponding toxic and side effects of the arsenic compound can be controlled, the combined medicine can be used more safely, and the therapeutic spectrum of the arsenic compound can be extended. The combined medicine has an especially excellent synergetic effect in the aspect of T-lymphoma cell line Jurkat cells.

The invention aims to solve the problems of lower activity, large catalyst dosage and the like of a polyoxometalate cluster catalyst in a selective oxidation process of diphenyl sulfide with hydrogen peroxide as an oxidizing agent, and provides a preparation method for synthesizing novel N-N-allyl imidazole functionalized molybdenum oxygen cluster catalyst which is expected to have better catalysis in selective oxidation of diphenyl sulfide.

The invention relates to the technical field of genetic engineering, in particular relating to a jujube tree ascorbate peroxidase gene and application thereof in improving stress resistance of plants. The nucleotide sequence of the jujube tree ascorbate peroxidase gene and the amino acid sequence of the coding protein of the jujube tree ascorbate peroxidase gene are shown in sequence tables of SEQ ID NO:1 and SEQ ID NO:2. In the invention, the jujube tree ascorbate peroxidase gene is obtained to construct a plant expression vector successfully transferred into an arabidopsis strain, and the salt tolerance of the jujube tree ascorbate peroxidase gene is evaluated, thereby proving that the jujube tree ascorbate peroxidase gene can be used for improving the salt tolerance of the plants. In addition, a prokaryotic expression vector constructed by the invention can be used for realizing induction and expression in escherichia coli. According to the invention, the first-time separation of the jujube tree ZjAPX (Ascorbate Peroxidase) gene is realized, and the gene can be used as a target gene transferred to the plants so as to improve the stress resistance, especially the salt tolerance of the plants, and has guiding significance in improving varieties of the plants, thereby providing test data and laying a theoretical basis for sufficiently utilizing the excellent-resistance gene of jujube trees to improve the stress resistance of the plants.

An arsenic compound solution, and an albumin nanoparticle and a lyophilized preparation prepared using same and entrapping an arsenic compound. The arsenic compound solution is prepared using the following method: adding As2O3 powder in sterile deionized water to obtain a suspension, 6 to 25 mg of As2O3 powder being added in every mL of sterile deionized water; dripping an NaOH solution to the obtained suspension until the powder is fully dissolved and adjusting the pH of the solution to 7.5 to 9, and making the concentration of the obtained arsenic compound solution be 5 to 20 mg / mL in terms of the added As2O3. The albumin nanoparticle is prepared by mixing an albumin solution and the arsenic solution and the arsenic solution with the mass ratio of the added As2O3 in arsenic compound solution to the albumin ranging from 1:5 to 1:20 and using a method of solvent removing and physical curing.

The invention discloses a preparation method of a bis(N-(4-carboxy)phenyl)peryleneimide zinc complex catalyst. In the method, zinc acetate, bis(N-(4-carboxy)phenyl)perylene Imide, triethylamine, water, and N,N'-dimethylimide are placed in a beaker for reaction. After the reaction is completed, filter and the filtrate evaporates slowly to obtain bis(N-(4-carboxy)phenyl)perylene Crystals of zinc imide complex catalysts. The method of the invention has the advantages of simple reaction process, high purity of the obtained product and simple aftertreatment. In the carbon dioxide cycloaddition reaction under atmospheric pressure, the conversion rate is as high as 97.5%, and the selectivity is as high as 97.9%.