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189results about How to "Improve biological activity" patented technology

Functional graphene oxide loaded nano-silver antibacterial material as well as preparation method and application thereof

The invention belongs to the technical field of nano-silver antibacterial materials and discloses an aminated polyethylene glycol functional graphene oxide loaded nano-silver antibacterial material, a preparation method of the antibacterial material and an application of the antibacterial material in the fields of bacteriostasis and sterilization. The method comprises the following steps: adding aminated polyethylene glycol into an aqueous solution of graphene oxide, adding 1-ethyl-(3-dimethylaminopropyl) carbonyldiimine hydrochloride and N-hydroxy succinimide, regulating the pH value, stirring, and reacting, thereby obtaining the aminated polyethylene glycol modified graphene oxide; preparing the aqueous solution of the graphene oxide, adding silver nitrate, heating until the solution is boiled after dissolving, adding sodium citrate or NaBH4 aqueous solution, reacting, and cooling, thereby obtaining the aminated polyethylene glycol functional graphene oxide loaded nano-silver antibacterial material. The antibacterial material prepared by the invention has good water solubility and stability, the loading efficiency and antibacterial activity are obviously improved, and the antibacterial material has obvious antibacterial activity and can be widely applied to the fields of bacteriostasis and sterilization.
Owner:JINAN UNIVERSITY

Strontium calcium silicate-containing biological ceramic as well as preparation method and application thereof

The invention relates to strontium calcium silicate-containing biological ceramic as well as a preparation method and an application thereof. The general formula of chemical constitution of the strontium calcium silicate-containing biological ceramic is Ca1-xSrxSiO3, wherein x is equal to 0.015 to 0.25. The strontium calcium silicate-containing biological ceramic is ceramic particles or porous ceramic. The strontium calcium silicate-containing biological ceramic disclosed by the invention, obtained by doping strontium into calcium silicate biological ceramic, has the advantages of both calcium silicate ceramic and strontium and is good in bioactivity and degradability, and silicon ions released by degradation of the strontium calcium silicate-containing biological ceramic have good effects of promoting proliferation of bone cells and stimulating expression of osteogenesis gene. Beside, an alkaline micro-environment formed by degradation of the material can achieve the effect of neutralizing an acidic micro-environment of osteoporotic bone; the strontium ions released by degradation have good dual functions of promoting osteogenesis and inhibiting the activity of osteoclasts. Therefore, the strontium calcium silicate-containing biological ceramic has wide application prospects in the field of treatment on bone defect repair accompanied with osteoporosis.
Owner:SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI

Method for treating micro polluted water by using biological nitrogen removal and physicochemical enhanced phosphorus removal combined process

The invention discloses a method for treating micro polluted water by using a biological nitrogen removal and physicochemical enhanced phosphorus removal combined process, and belongs to the technical field of water pollution purification treatment. The inlet water enters a biological contact oxidation tank through a lifting pump, and flexible fibers are used as a film forming filler and a rotary fan is adopted for aeration in the tank; the outlet water overflows to a quick filter tank, the bottom of the tank is provided with a backwashing pipeline, and the tank is periodically backwashed to avoid blockage; the outlet water of the quick filter tank passes through a deoxidization tank from bottom to top, so dissolved oxygen (DO) in the water is reduced, and a favorable condition is provided for subsequent denitrification; an facultative tank realizes denitrification by adopting a camphorwood leaf and ceramsite combined filler to remove TN; the outlet water flows into a flocculation reaction tank and is subjected to enhanced coagulation with stirring; and soil-liquid separation is performed in a phosphorus removal sedimentation tank, and the supernate flows through an anthracite filler device from bottom to top and finally flows into a lake. The method ensures that the substances such as chemical oxygen demand (COD), NH4+-N, NO3--N, TN, TP, SS, Chla and the like in the outlet water are furthest removed, and the outlet water reaches the class III water quality standard of Environmental Quality Standards for Surface Water (GB3838-2002).
Owner:上海海蓝水处理科技有限公司

Production method of anti-bacterial SBR (styrene butadiene rubber) foaming material

The invention relates to a production method of an anti-bacterial SBR (styrene butadiene rubber) foaming material. The ingredients includes, by weight parts, 20 to 40 parts of natural rubber, 60 to 80 parts of main SBR materials, 10 to 15 parts of process/operation auxiliaries, 20 to 30 parts of vulcanization /foaming auxiliaries, 40 to 50 parts of processing oil and 120 to 150 parts of reinforcing filler. The production method includes steps of firstly, masticating; secondly, mixing; thirdly, opening smelting; fourthly, fine smelting; fifthly, open smelting secondarily; sixthly, extruding; seventhly, vulcanizing and eighthly, foaming. The production method is characterized in that 3 to 5 parts of nanometer silver powder are added into the ingredients according to mass ratio, the first step of the production method includes feeding the natural rubber and the nanometer silver powder into an open smelting machine or a fine smelting machine to realize mastication, and the second step of the production method includes feeding a primary product of the first step, the main SBR and the process/operation auxiliaries into the fine smelting machine to mix. The production method of the anti-bacterial SBR foaming material has the advantages that anti-bacterial nanometer silver powder can prevent physiological breeding of bacteria while original characteristics of the foaming material are kept.
Owner:丁金标

Enhanced synchronous nitrification and denitrification process for adding AHLs signal molecules into biological moving bed process

The invention discloses an enhanced synchronous nitrification and denitrification process for adding AHLs signal molecules into a biological moving bed process, and belongs to the technical field of sewage treatment. According to the present invention, the process is based on a biological moving bed process, and comprises: improving the biological film forming process and the operating process ina moving bed biofilm process and a biofilm and active sludge composite process, and adding AHLs signal molecules, such that the quorum sensing QS crucial to the formation of bacterial biofilms can bepromoted; and a certain proportion of the AHLs signal molecule mixture with a certain concentration is added to the biological moving bed process, such that the biological activity is improved, the biomass is increased, the growth and biofilm formation of the biological film on the carrier is accelerated, the functional bacterial flora structure in the system is optimized, the biological diversityof the system is improved, the synchronous nitrification and denitrification nitrogen removal effect of the system is further enhanced, and the ammonia nitrogen and the total nitrogen in the effluentcan meet the requirements of standard emission.
Owner:DALIAN UNIV OF TECH

Porous nano-ceramic constructed by hydroxyapatite nanorods or sheets and preparation method thereof

The invention relates to porous nano-ceramic constructed by hydroxyapatite nanorods or sheets and a preparation method thereof, belonging to the technical field of biological materials. The method comprises the following steps: performing nanocrystallization on porous ceramic containing tricalcium phosphate by using a hydrothermal method, namely mixing an ethylenediaminetetraacetic acid water solution with the concentration of 0-0.5mol/L and a water solution of Ca(NO3)2.4H2O and (NH4)2HPO4 with the concentration of 0-0.5mol/L and the molar ratio of Ca: P of 1.67 to get a mixed water solution; regulating the pH value by using hydrochloric acid and sodium hydroxide; and further adding the porous ceramic containing tricalcium phosphate and the mixed water solution into a hydrothermal reaction kettle for reaction, and controlling temperature and time to get the porous nano-ceramic constituted by the hydroxyapatite nanorods or nano-sheets. Compared with traditional calcium phosphate porous ceramic, the porous nano-ceramic constructed according to the invention has the advantages of higher biological activity and improved degradability; and the preparation method is simple, high in repeatability and capable of realizing large-scale production.
Owner:SICHUAN UNIV

Amphiphilic amido inulin and preparation method thereof

ActiveCN102952208AHigh reactivityImprove biological activityInulinLithium azide
The invention relates to the field of daily chemicals and the medicine industry, in particular to an amphiphilic amido inulin and a preparation method thereof. The amphiphilic amido inulin is shown in a formula (1), wherein R is H, CH3, CH3CH2CH2, (CH3)2CH or C6H5; and the average numeric area of n is 10-35. The preparation method comprises the following steps of: performing halogenating reaction on the primary hydroxyl of inulin; after reaction, reacting with sodium azide or lithium azide at 40-70 DEG C for 8-24 hours; purifying to obtain 6 azide-3,4-succinate-6 deoxidized inulin; and reducing the 6 azide-3,4-succinate-6 deoxidized inulin by utilizing triphenylphosphine, so as to obtain the amphiphilic amido inulin. According to the pepaation method, the amphiphilic amido inulin is obtained by virtue of an effective synthesis means, halogen is used for replacing the primary hydroxyl of inulin so as to cause that the sixth-site group of the inulin is ionized easily, acyl is used for protecting the naked hydroxy, at the othe sites, of the inulin, azido is used for performing nucleophilic substitution on the sixth-site group which is ionized easily, and the product is reduced so as to obtain the amphiphilic amido inulin with high substitution degree. The preparation method has the advantages that the synthesis step is simple, popularization is easy, and required equipment and raw materials are easily available. The formula (1) is shown in the specification.
Owner:YANTAI INST OF COASTAL ZONE RES CHINESE ACAD OF SCI

Method for preparing strontium-doped calcium phosphate coating on surface of magnesium alloy through one-step hydrothermal method

The invention relates to a method for preparing a strontium-doped calcium phosphate coating on the surface of magnesium alloy through a one-step hydrothermal method. The method includes the steps that a coating solution is placed in a reaction still, and a magnesium alloy sample treated through alkali is soaked into the coating solution; the reaction still is placed in a drying oven, and heat preservation lasts for 1-3 h at the temperature of 90-110 DEG C; and finally, the reaction still is cooled to an indoor temperature along with the drying oven, and the magnesium alloy sample is taken out, rinsed with deionized water and then dried. The prepared coating on the surface of the magnesium alloy is structurally divided into an upper layer and a lower layer. The upper layer of the coating is of a flower-shaped cluster structure, the lower layer of the coating is of a compact sheet structure, and the coating thickness is 1-2 microns. In an in-vitro immersion experiment, deposited hydroxyapatite appears on the first day to the third day, and good biological activity is achieved; and moreover the alternating-current impedance is 7500-14000 ohm.cm<2>. The biological activity of the magnesium alloy is improved, and meanwhile corrosion resistance of the magnesium alloy in simulated body fluid is improved. The preparation technology is simple, the method is environmentally friendly, and great commercial popularizing value can be achieved.
Owner:TIANJIN UNIV
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