275results about How to "Improve biostability" patented technology

A hyaluronic acid (HA) composition includes crosslinked, water-insoluble, hydrated HA gel particles. The HA includes crosslinks represented by the following structural formula:

HA—U—R₂—U—HA

The variables are defined herein. A method of augmenting tissue in a subject includes inserting a needle into a subject at a location in the subject that is in need of tissue augmentation, wherein the needle is coupled to a syringe loaded with the HA composition, and applying force to the syringe, to deliver the HA composition into the subject. A method of preparing the HA composition, includes forming water-insoluble, dehydrated crosslinked HA particles, separating the water-insoluble, dehydrated particles by average diameter, selecting a subset of particles by average diameter, and hydrating the subset of dehydrated particles with a physiologically compatible aqueous solution. Another method of preparing the crosslinked HA composition includes crosslinking a precursor of the crosslinked HA with a biscarbodiimide in the presence of a pH buffer and dehydrating the crosslinked HA. Also included is a method of augmenting tissue in a subject that is in need of tissue augmentation. A method of stabilizing crosslinked HA includes hydrating water-insoluble, dehydrated crosslinked HA with a physiologically compatible aqueous solution that includes a local anesthetic, wherein the value of storage modulus G′ for the stabilized composition is at least about 110% of the value of G′ for a non-stabilized composition,. Also included is the stabilized HA composition.

A vascular graft, such as an AAA stent graft, includes a core zone of PET fabric with a non-porous coating comprising a polyurethane, such as Thoralon®, disposed on at least one surface. The coating provides a barrier to prevent short and long term leakage of fluids through the pores of the PET fabric core zone. A method for sealing the pores of a porous PET graft includes the step of coating at least one surface of said graft with at least one polyurethane, or mixtures and combinations thereof. Preferably, the coating is Thoralon®. A method for making a vascular prosthesis includes the steps of providing a core zone of PET fabric, and coating at least one surface of the core zone with at least one polyurethane, or mixtures and combinations thereof, such as Thoralon®. Finally, a method of repairing or treating a defective vessel includes the step of reinforcing or replacing the defective vessel with a graft according to the invention.

A method of modulating the expression of a nucleic acid in the hepatic system of a mammal is disclosed. In addition, a method of preferentially targeting an oligonucleotide to liver cells in a mammal is disclosed. Also, a method of treating an animal having a hepatic disease or disorder associated with a protein encoded by a gene is disclosed. A composition containing an oligonucleotide is disclosed.

An implantable medical device comprising a drug-loaded polymer overlaid with a fabric that promotes tissue ingrowth is useful in a wide variety of tissue engineering applications. The invention includes, for example, prosthetic heart valves, annuloplasty rings, and grafts, having enhanced biocompatibility and biostability. Methods of making and using the implantable medical devices of the invention are also included.

The invention discloses a medlar and red date enzyme and a preparation method thereof, which belong to the technical field of enzyme preparation. Multi-strain composite fungi powder is adopted as a leavening agent; the medlar and the red date are adopted as main raw materials; dietary fiber, pectin hydrolyzate, seasoner extracting liquor, Chinese herbal medicine extracting liquor, enzyme stabilizer and other multifunctional auxiliary raw materials are scientifically compounded and modified; low-temperature processing technology such as ultrasonic cleaning, cryogenic grinding, microwave-assisted high-voltage pulse electric field processing and ultrasonic ripening are mainly adopted in the whole process, so that the natural colors, the flavor, the taste and the content of the active materials of the medlar and the red date are maintained furthest, the biological stability, the non-biological stability and the biological activity of the medlar and red date enzyme are obviously enhanced, the introduction of chemical addition agent is reduced, and the juicing rate of the medlar and the red date as well as the food safety of the enzyme are improved. Finally, the medlar and red date enzyme with high biological activity, strong stability, strong taste, flavor and appetite, long expiration date and edible safety is prepared.

The invention discloses a health product for increasing bone density and a preparation method of the health product. Chinese dwarf cherries, Chinese herbal medicine extracts refined by adopting a modern extraction technology and other raw materials having the function of increasing the bone density are scientifically compounded and are scientifically combined omnibearingly to play a synergistic effect, so as to effectively promote the calcium absorption in multiple aspects, repair and reconstruct the cartilago articularis, promote the generation of synovial fluid, promote the synthesis of collagen in cartilago articularis substrates, prevent the further degradation of cartilage, indirectly reduce the osteoclast function, inhibit the re-absorption of bones, increase the content of bone calcium and perfect the biomechanical properties of the bones, so that the product has a good function of increasing the bone density. A microwave drying technology in the preparation method can be used for further improving the integration and biological stability of the health product, and by means of the antioxidant activity of a grape seed extract in the raw materials, the strong adsorption and inclusion functions of modified dietary fibers and the antifungal propertie of the Chinese herbal medicine extracts, an efficient, safe, nutritional and stable health product having the function of increasing the bone density is prepared finally.

A biostable porous polyether or polycarbonate polyurethane implant is manufactured from diphenyl methane diisocyanate, difunctional polytetramethylene ether glycol or a polycarbonate polyol, a trimerisation catalyst, a chain extender, water, a cross-linking agent, a blowing and/or gelling catalyst and a surfactant. The porous biomaterial has isocyanurate linkages and avoid content in excess of 85%. The implant may be used as an occluder or a tissue bridge.

The invention belongs to the technical field of biomolecular labeling, in particular to a method for preparing an amino functional magnetic fluorescent coding microsphere with double-nucleocapsid structure. Two semiconductor quantum dots with different fluorescence colors and superparamagnetic ferric oxide nano-particles are embedded in a same silicon dioxide nano-particle in inverse microemulsion to form an amino functional magnetic fluorescent coding microsphere which has the granularity between 40nm and 100nm, high fluorescence intensity and high stability. The invention adjusts the fluorescence position and the intensity of the microsphere by changing the sort and the proportion of the quantum dots of different fluorescence colors and realizes different fluorescent coding. The addition of superparamagnetic ferroferric oxide ensures that the microsphere can gather and move fast in a targeted way under the action of an externally-applied magnetic field. Through amido modification on the surface of the microsphere, the invention can be widely applied to the fields of immunological test, nucleic acid hybridization, gene analysis, cell classification and imaging, etc.

The invention discloses preparation and application of exosome secreted by human derived blood or mesenchymal stem cell. The preparation process of exosome comprises: extracting mesenchymal stem cells from health-human body blood or a stem cell culture supernatant, performing in-vitro culture and amplification, and utilizing means such as low-temperature separation, purification and the like to prepare high-purity high-bioactivity exosome. The blood or mesenchymal stem cell secreted exosome is added into medicines, health-care products and cosmetics according to ratios for developing of products with bioactivity, is capable of effectively regulating and controlling body cell signal transduction, activating cell regeneration, enhancing health cell proliferation and differentiation capacity, further regulating physiologic restoration or removing damaged, pathologic and aged cells of a body, fundamentally changing body physiologic functions, and helping to generate anti-tumor treatment effect by adjusting cellular immunity. The blood or mesenchymal stem cell secreted exosome is applicable to fields of medical science, health care and beauty treatment, and has wide application prospect.

The invention relates to the technical field of medical biology, and specifically discloses a novel coronavirus (SARS-COV-2) spike protein binding molecule and applications thereof. The binding molecule can specifically bind the spike protein of SARS-COV-2 and includes at least one immunoglobulin single variable structural domain. The provided binding molecule can specifically bind the SARS-COV-2-Spike protein and effectively block the binding of the SARS-COV-2-Spike protein and human cell ACE2 receptors, so that the infection process of the SARS-COV-2 on cells can be further blocked, and theinfection and amplification of the SARS-COV-2 can be inhibited.

A biological adhesive formulation comprising dextrin, at least one adhesiveness modifier agent, and at least one antibiotic is suitable for promoting healing of tissue in a patient, for example, to prevent anastomosis of a surgical wound in the digestive system of a patient, and for affixing a prosthesis during a hernia operation.

The present invention discloses a watermelon juice probiotic fermented beverage and a preparation method thereof. The beverage preparation method uses watermelons as raw materials, scientifically blends prebiotic factors, does not add any essences and coloring matters, mainly uses low-temperature processing technology such as ultrasonic wave cleaning, high-pressure pulsed electric field treatment, biological enzymolysis, vacuum degassing, etc. in the whole process, replaces the existing heat sterilization and enzyme blunting technology, maintains the color and luster, flavor and mouth feel of the natural watermelon juice to a maximum degree, enhances the non-biological stability and biological stability of the watermelon juice, reduces the addition of chemical additives, increases the juice squeezing rate and food safety of the watermelon juice, and has a probiotic live bacteria content of 7 multiplied by 10^11 to 8 multiplied by 10^11 cfu/ml. The watermelon juice probiotic fermented beverage is environmentally friendly, can be processed into probiotic solid beverage and quantitatively packaged beverage which have natural taste, are nutritious and health-care, are convenient to drink, and have longer shelf lives, opens up a new way for watermelon deep processing and industrial development, and can achieve better economic and social benefits.

Articulating devices for replacing damaged or degenerated weight bearing joints are provided. The devices may have two or more surfaces that articulate against one another that are coated or fully formed of PEEK or similar materials to provide improved wear capabilities while maintaining sufficient strength to operate in a weight bearing capacity.

The invention belongs to the technical field of waste water processing. An inorganic-organic compound-type adsorbent is prepared by compositing three natural materials of natural clinoptilolite, humic acid and chitosan. The method comprises the following specific steps of: performing pre-activation modification on the natural clinoptilolite, performing insolubility processing on humic acid, sufficiently mixing the processed clinoptilolite, insoluble humic acid and acidic chitosan solution according to a certain proportion, heating and drying through microwave, grinding and screening to prepare the inorganic-organic compound-type adsorbent with a loose porous structure, high surface activity and high ion exchanging performance. The prepared adsorbent is used for processing the industrial waste water with the concentration of Cr(VI) lower than 100mg/L, wherein the concentration of effluent Cr(VI) is lower than 0.5mg/L, which meets the requirement of the maximum permissible discharge concentration of the first type of pollutant in the national waste water comprehensive discharge standard. The method has easily obtained materials, simple processing technique and high processing efficiency, and is suitable for large-scale production.

A methoxy polyethylene glycol (mPEG) modified insulin compound is prepared from INS protein (insulin) and methoxy polyethylene glycol derivative through modifying reaction to obtain the solution of coarse product, ion exchange chromatography, collecting, centrifugal ultrafiltering, concentrating, and freeze drying to obtain high-purity product.

The invention relates to environmental engineering and water treatment technology, and aims at providing a solar micro-power self-watering dry type ecological floating island applied to ecological restoration of eutrophic water and beautification of landscape water. The invention integrates the advantages of microbial technology, ecological floating island technology and solar energy technology to remove organics, nitrogen and phosphorus in the eutrophic water; meanwhile, dissolved oxygen in the water can be increased and self-purification capacity of the water can be enhanced by a solar watering device, and thereby better ecological restoration effect is achieved. The dry type floating island can be planted with multiple kinds of plants, thus playing a good role in enriching the ecological system of the floating island and facilitating birds and fishes inhabiting the floating island, and providing sufficient conditions for the naturalization of the floating island without producing secondary pollution to environment.

The invention provides a method for preparing a porous tantalum medical implant material based on an electron beam selective melting technology. The method comprises the steps that firstly, software is utilized for reconstructing a two-dimensional medical CT image or MRI data, and a three-dimensional model of the porous tantalum medical implant material is obtained after structure optimization andsupporting addition processing are conducted on a three-dimensional rough model; and secondly, selective melting is conducted on tantalum powder by adopting electron beams according to shearing-layerdata of the three-dimensional model of the porous tantalum medical implant material, and then the porous tantalum medical implant material is obtained. According to the method for preparing the porous tantalum medical implant material based on the electron beam selective melting technology, the tantalum powder is melted and formed under the vacuum condition, and no additive is contained in the tantalum powder, so that the oxidation phenomenon after heating of tantalum is avoided, contamination of impurity elements such as carbon and oxygen is reduced, the requirement of the customized poroustantalum medical implant material is met, and meanwhile biological stability and biological compatibility of the porous tantalum medical implant material are improved. Post-processing processes such as sintering and annealing do not need to be conducted on the obtained porous tantalum medical implant material, and the method is convenient and efficient.

This invention relates to using chitosan nanometer fabric compound membrane for the immobilized enzyme. It soluts chitosan and polyvinyl alcohol in mixed solvents of acetic acid and water to form a transparent solution, through static electricity spinning to form chitosan nanometer fabric compound membrane, and take it as immobilized enzyme carriers, through chemical bonding in ways to fix enzyme on composite membrane. The invention uses nanometer composite membrane of high specific surface area and high porosity, and chitosan which is the reactive amino biocompatibility and can be set with high-volume, high specific activity, high catalytic efficiency of chitosan nanometer fabric compound membrane immobilized enzyme.

The invention relates to an ecological restoring method for stereoscopic greening of a high stability slope. An ecological curing agent is used to spray the soil on the slope to form a curing film toplay the role of windproof and sand fixation, then a reinforcement net and concrete are added on the slope face to reinforce the slope face, the stability of the slope face is improved by being combined with a stable structure layer, the non-woven fabric and a plant fiber mesh layer in the reinforcement net is easy to degrade, and the environmental protection is achieved, so that a water-retainingnutrition matrix layer and the slope can be combined more stably, and the anti-scour performance, firmness, high durability and high stability are achieved; a water-retaining nutrition matrix structure and nutrients are superior to the ordinary soil and contain various elements, the composition is comprehensive the growth needs of the plants can be met well, the plant growth is matched, the rapidgreening and ecological restoration are achieved, and the greening effect is permanent; and the small arbors and the small shrubs are cold, drought and barren resistance and high in resistance, a arbor, shrub and grass three-dimensional protection ecosystem is adopted, the balance of the rapid growth and slow growth is achieved, the biodiversity and stability of the population are improved, and the stability of slope greening is further improved.

The invention provides a high efficiency fluidization upward flow multilayer composite filter material biological filter tank coupled with ozonation and a water treatment method thereof, relating to a biological filter tank and a water treatment method using the biological filter tank. The biological filter tank is composed of an upper filter material, a medium filter material, a lower filter material and a supporting layer, wherein the upper filter material is active carbon, anthracite or biological ceramsite, the medium filter material is modified zeolite, natural zeolite or synthetic zeolite and the lower filter material is a phosphorus functional material. The filter tank is characterized by fast start, a complex and stable biological phase, great biomass, high activity, strong impact resistance, a filter material expansion rate of 0% to 50%, small resistance at the head of the filter tank, high mass transfer efficiency of materials, oxygen and pollutants, a high utilization rate of filter layers and filter materials and small possibility of occurrence of hardening of the filtering materials. The filter tank is applicable to treatment of raw water in which the concentration of water source phosphorus, ammonia nitrogen and organic pollutants fluctuates and can stably operate at a low temperature.

Methods and compositions for transporting drugs and macromolecules across biological membranes are disclosed. In one embodiment, the invention pertains to a method for enhancing transport of a selected compound across a biological membrane, wherein a biological membrane is contacted with a conjugate containing a biologically active agent that is covalently attached to a transport polymer. In a preferred embodiment, the polymer consists of from 6 to 25 subunits, at least 50% of which contain a guanidino or amidino sidechain moiety. The polymer is effective to impart to the attached agent a rate of trans-membrane transport across a biological membrane that is greater than the rate of trans-membrane transport of the agent in non-conjugated form.

The invention relates to copper selenide/mesoporous silica core-shell nanoparticles and a preparation method and application thereof. The copper selenide/mesoporous silica core-shell nanoparticles are Cu2<-x>Se/mSiO2-PEG core-shell nanoparticles, where x is 0-1, and m is mesoporous. The preparation method comprises the following steps: preparing a Cu2<-x>Se nanocrystalline, transferring the hydrophobic Cu2<-x>Se nanocrystalline into an aqueous phase through CTAB (Cetyltrimethyl Ammonium Bromide), and growing a mesoporous silica layer on the surface of the CTAB through a sol-gel method by taking the CTAB as a template; and finally, modifying and coupling polyethylene glycol to the surface, and obtaining the copper selenide/mesoporous silica core-shell nanoparticles. The invention also discloses application in preparation of diagnosis and treatment preparations. The obtained Cu2<-x>Se/mSiO2-PEG has extremely low cytotoxicity, so that cancer cells can be effectively killed through light and heat, and the anti-cancer drug DOX can be effectively transmitted into the cells and has pH and laser-sensitive drug sustained release performance, so that a synergistic effect between photothermal therapy and chemotherapy can be realized.

The invention discloses a system and a method for removing natural organic substances and odor-induced substances in micro polluted water, which belong to the fields of water treatment processes and equipment. The system comprises an aeration biological filter tower, an ultra-filtration membrane assembly and a regulating tank, wherein the bottom of the aeration biological filter tower is connected with the bottom of the regulating tank through a pipeline; the regulating tank is provided with two water outlet passages, namely a direct water outlet passage of the regulating tank and a water passage for connecting the regulating tank and the ultra-filtration membrane assembly; the water outlet of the ultra-filtration membrane assembly is connected with the water inlet of a clean water tank through a water outlet pump. The invention also discloses the method for removing the natural organic substances and the odor-induced substances in the micro polluted water by using the system. The treatment process can simultaneously remove the natural organic substances and 2-methyl isoborneol and geosmin serving as the odor-induced substances in the water, the quality of the discharged water is good, the adding amount of a disinfectant is obviously reduced, and the generation of disinfection byproducts is reduced.