1139results about How to "Not easy to degrade" patented technology

This invention relates to polysaccharides extract from Dendrobium candidum and its preparation method. The molecular weight of the polysaccharide extract of Dendrobium candidum is 10000-300000. The content of polysaccharide is no less than 25 wt%. The invention also relates to a Chinese medicinal composition containing polysaccharide extract from Dendrobium candidum and its preparation method, and application of the polysaccharide extract in preparing medicine for auxiliary treatment of diseases caused by hypoimmunity. The extract and Chinese medicinal composition containing the same can improve immunologic function with high bioavailability, no toxicity and adverse side effect. the preparation method is simple and convenient for operation and commercial process.

A semiconductor device includes a pixel electrode and a transistor which includes a first gate electrode, a first insulating layer over the first gate electrode, a semiconductor layer over the first insulating layer, a second insulating layer over the semiconductor layer, and a second gate electrode. The pixel electrode and the second gate electrode are provided over the second insulating layer. The first gate electrode has a region overlapping with the semiconductor layer with the first insulating layer provided therebetween. The second gate electrode has a region overlapping with the semiconductor layer with the second insulating layer provided therebetween. A first region is at least part of a region where the second gate electrode overlaps with the semiconductor layer. A second region is at least part of a region where the pixel electrode is provided. The second insulating layer is thinner in the first region than in the second region.

The invention discloses a natural macromolecular modified starch profile-control agent applied to oil-fields, and the raw materials include natural macromolecular modified starch polymers (3000mg/L), crosslinking agent (A 750mg/L), crosslinking agent B (400mg/L) and acidity regulator (800mg/L). There are various raw materials for preparing profile control agent, the gel achieved after crosslinking with the crosslinking agent has strong hydroscopicity, i.e. the polymer gel has certain strength and certain heat/salt resisting property, and gel with stable performance can be achieved after crosslinking with the crosslinking agent.

The invention relates to water-collecting polymer filament imitating the spider silk structure and a preparation method thereof. The preparation method comprises the following steps of: immersing common artificial silks into polymer solution mixed by a good solvent and a poor solvent containing polymer, then horizontally pulling out the artificial silks from the polymer solution along the axial direction of the artificial silks, and further enabling the polymer solution to wrap the surfaces of the artificial silks to form a liquid film; then due to Rayleigh instability, causing that the liquid film of the polymer solution on the surfaces of the artificial silks evolutes (break) into a string of liquid drops hung on the artificial silks; by adjusting the humidity and the temperature of the environment, drying the polymer liquid drops hung on the artificial silks so as to form spindle knots with periodic arrangement and a spindle-shaped structure on the surfaces of the artificial silks; and enabling the spindle knots which are in alignment along the axial direction of the artificial silks to form a coarse structure on the surfaces of the artificial silks, and further obtaining the water collecting polymer silks with the similar spider-silk structure by biomimetic synthesis.

A cellulose solution containing components as follow: cellulose, which is 7.0%-30.0% of weight of cellulose solution, other components of are imidazolium ionic liquid which can dissolve cellulose and organic solvent mutual soluble with the imidazolium ionic liquid, with a weight ratio ranging from 1:9 to 24:1. The aforementioned cellulose solution is prepared by: mixing cellulose pulp with other components, preparing uniform cellulose solution by steps of heating, stirring, kneading, and vacuumizing. The cellulose solution prepared by aforementioned method can reduce hardness in process, relieving abrasion of apparatus, and the prepared solution is high in concentration, stable and hard to degrade. And cost can be reduced, suitable for industrialization.

The invention relates to a method for preparing opening micropore plastic material though slack-melting, extruding and molding. The method includes the processes: after reaching from a feeding device arranged on a double piston extruder to a heating material cylinder, preheating plastic powder with particle size of 40-1500 meshes is extruded by the piston driven by a hydraulic driver and compacted, transported and heated constantly; when the surface temperature of the plastic powder reaches the melt temperature of Tf plus or minus 20 DGE C, the power is extruded from a machine head and a die. Then, extruding matters are cooled and set by a cooling-traction device and the products are finished. By regulating the particle size of the powder, addictive and forming process conditions and so on, the invention can control opening rate, size and distribution of the aperture; the invention has simple process, short production cycle, low forming temperature and pressure as well as short forming time; besides, the invention can greatly reduce the production cost can not be degraded easily when the plastic is processed and can be widely applicable to molding of the opening micropore products of thermoplastic powders, thermosetting power and so on.

The invention relates to the technical field of high molecular materials and particularly relates to preparation and application methods of a selective laser sintering polypropylene powdery material. The method comprises the following steps: obtaining polypropylene powder by a freeze grinding method; grading and collecting by an airflow screening machine, selecting polypropylene powder with the granularity in a range of 200-800 meshes and returning coarse materials which do not meet the fineness requirement to a stock bin and continuously smashing; and adding 100 parts of polypropylene powder, 0.1-1 part of graphite powder, 0.01-0.5 part of antioxidant and 0.5-6 parts of metallic soap salt and uniformly mixing in a high speed mixer, wherein the granularity of the graphite powder is 1000-5000 meshes and the antioxidant is a compound antioxidant consisting of phenols and phosphonate or thioester in a weight ratio of 1:1. The polypropylene powder prepared by the invention has excellent sintering performance and the SLS (Selective Laser Sintering) formed piece prepared by the polypropylene powder has high mechanical property and dimensional precision.

The invention relates to a tumor-targeted gene vector material and a preparation method and use thereof. In the invention, functional graphene oxide is used as a targeted transport vector of genomic molecules such as siRNA. The preparation method comprises: connecting folic acid tumor cell targeted molecules and amino-terminated polyethylene glycol by amido bonds; connecting the graphene oxide with the coupling material by amido bonds to obtain the tumor targeted functional graphene oxide; anchoring aminated molecules with an aromatic conjugated structure onto the surface of the graphene oxide through pi-pi conjugation; and finally, preparing the tumor targeted high-efficiency gene transport system by static attraction between the positively charged functional graphene oxide and the negatively charged genomic molecules. The vector material has a high targeting performance for tumor cells in which folic acid receptor is expressed more highly, and after being loaded with siRNA, the corresponding target gene level and related protein expression can be reduced. The invention provides a new method for the in-vivo targeted transportation of genes.

The invention provides a film forming compound with modified starch as the main component, a film forming material containing the compound, and more particularly a hard-shell natural capsule made from the compound. The compound contains no or very little animal protein such as gelatin, etc. The compound can partially or completely replace the gelatin from animals for producing natural hard-shell capsules. The prepared natural capsule shell product has the advantages of excellent film forming property, high strength, good flexibility, high transparency, decomposability and microbial pollution resistance. The main component of the compound, modified starch, has stable quality and highly controllable performance.

The invention discloses a preparation method of freshwater collecting fibers with a transmission function and an application thereof and belongs to the technical field of chemical bionics. The preparation method comprises the following steps of: completely soaking a support fixed with the fibers in a prepared polymer solution with the mass fraction of 5-9% for lifting and pulling, wherein raised nodes, which are sequentially arrayed according to the size, are generated on the fibers, and finally drying to obtain the freshwater collecting fibers. The freshwater collecting fibers are woven intothe freshwater collecting fiber net for carrying out freshwater collection; and the freshwater collecting fiber net can be used for collecting freshwater in fog so that the visibility of air can be increased; and the freshwater collecting fiber net has high water collection efficiency and can be used for removing fog. The heights of the raised nodes on the surfaces of the fibers prepared by the method are uniformly increased from small to large and are controlled; the surfaces of the fibers are provided with more microscopic bulges or micropores so that the collision probability and the spreading speed of water drops in air can be increased, and the efficiency of collecting water is increased; and the freshwater collecting fibers are suitable for coastal deserts, islands, ocean ships, foggy mountain areas and the like; and the cost of the freshwater collecting fiber for collecting the freshwater is far lower than the cost for the desalination of sea water.

The invention discloses a hyperglycosylated human coagulation factor VIII (FVIII) fusion protein and a preparation method and application thereof. The fusion protein successively contains human FVIII, a soft peptide connector, at least one human chorionic gonadotropin betasubunitcarboxyl terminal peptide rigid unit and prolonged half-life period portion (preferably ahumanIgG Fc variant) from an end N to an end C. The fusion protein has biological activity similar to that of recombinant FVIII and prolonged in-vivo activity half-life period, thereby improving the pharmacokinetics and drug efficacy.

The invention relates to an oxiracetam freeze-drying preparation for injection and a preparation method thereof, belonging to the technical field of medicines. The freeze-drying preparation is a crystal form compound formed by oxiracetam, D-sorbitol and mannitol in a weight ratio of 1: (0.2-0.25): (0.05-0.1). The oxiracetam freeze-drying preparation has the beneficial effects that the production cycle is shortened by about 20 hours, the rate of finished products is increased by above 99%, the phenomena such as the upward shifting and the eruption of the product are avoided, medicine molecules are constrained in crystal lattices, the water content is extremely low and can be controlled below 0.1%, the preparation is difficult to degrade and has relatively good stability, the period of validity is up to 36 months, the impurity content is greatly reduced, the single maximum impurity is less than 0.1%, and the total impurities are less than 0.5%; no organic solvents are involved in the production process, the energy consumption and the cost are substantially reduced, and the technology has environmentally-friendly effect and is suitable for large-scale industrialization production. Compared with the prior art, the oxiracetam freeze-drying preparation provided by the invention has obviously improved curative effect and is suitable for clinical application.

A bionic composite film for collecting fog drops or dispersing dense fog is composed of a substrate, a hydrophobic polymer film on said substrate, and several lines of small circular humps made of glass microbead or hydrophilic polymer containing inorganic oxide particles. Its preparing process includes such steps as coating the solution of hydrophobic polymer on the substrate, and applying the glass microbeads or the concentrated solution of hydrophilic polymer onto the film of hydrophobic polymer by a rolling screen.

The invention relates to human umbilical cord mesenchymal stem cell extract freeze-dried powder and a preparation method. The preparation method of the human umbilical cord mesenchymal stem cell extract freeze-dried powder comprises the following steps: obtaining human umbilical cord mesenchymal primary stem cells, which are relatively high in purity, by virtue of density gradient centrifugation, conducting subculture, collecting a culture supernatant of the 3rd-18th generations of cells, and mixing the supernatant with trehalose, so that the freeze-dried powder is prepared. The human umbilical cord mesenchymal stem cell extract freeze-dried powder prepared by the invention has good appearance characteristics; the freeze-dried powder, when redissolved, is relatively rapid to dissolve and is completely dissolved; and animal experiments prove that the freeze-dried powder is low in irritation, high in safety and reliable to use. In addition, the freeze-dried powder disclosed by the invention can effectively preserve various bioactive cell factors in the human umbilical cord mesenchymal stem cell culture supernatant, protect skin from ultraviolet damage and promote the synthesis of skin collagen, and the freeze-dried powder has functions of whitening the skin and delaying aging.

The invention discloses a production process of an organic and inorganic compound fertilizer; the organic and inorganic compound fertilizer is prepared by mixing straw with a phosphatic fertilizer, a nitrogenous fertilizer, livestock manure, an inorganic salt, an efficient rotten bacterium agent and a conditioner for fermentation reaction to obtain organic matter, mixing the organic matter with an inorganic fertilizer produced by mixing urea, monoammonium phosphate and potassium chloride; the produced inorganic organic compound fertilizer is simple in production process, easy to operate, suitable for all kinds of vegetables, fruit trees, flowers, and the like, and quick in effect, can enable products to come into the market earlier, is better in quality, and is a pure natural green fertilizer with high quality, high content and high utilization rate.

The invention discloses a production method for a lightweight wood-plastic compound plate. The method includes that thermoplastic plastic powder, the average grain diameter of which is 40 meshes or above, is first mixed with at least one of a plasticizer, a tackifier, a dispersant or a foaming agnet; the mixture is preheated to 40 to 130 DEG C; then after being uniformly mixed with dried organic cellulose filler powder the average grain diameters of which is 40 meshes or above, the mixture is put into a pre-heated plastic mold cavity and pressed for 3 to 15 minutes at the mold pressing temperature of 150 to 200 DEG C and a pressure of 5 to 20MPa; the air is discharged for 0 to 3 times during the pressing process and finally the mixture is cooled under pressure keeping. The shaping process flow and the heating time of the invention are short; the organic cellulose filler and the plastic are hard to be degraded; besides, the pressure is low and the pressing time is short; not only is the production period shortened, but also energies are saved. Besides, the method of the invention is also beneficial to controlling the aperture ratio, the aperture size and the distribution as well as the porosity of the wood-plastic plate by virtue of the grain diameter of the powder, additives and the shaping technique.

Disclosed are a memory device, which performs fast data renewal and erasure, and a memory device which is not easily degraded. In the memory area of a flash memory (11), each block is divided into physical pages and each physical pages is divided into logical pages. A redundancy portion is provided for each physical page. When supplied with to-be-written data and the logical address of a write destination, a CPU (121) writes this data in an empty logical page and allocates the supplied logical address to this logical page. An old data flag in the redundancy portion in that physical page which includes a logical page having old data stored therein is changed in such a way as to indicate that data in this logical page is invalid. New data writing is done in that logical page to which a logical address is not allocated. At the time of flash-erasing a block, data which is stored in that logical page which is indicated by the old data flag is not transferred.

The invention provides a preparation method for an absorptive gel ball. The method provided by the invention comprises the following steps: a) carrying out carboxylation processing on a carbon nano tube by utilizing the mixed solution of concentrated sulfuric acid and concentrated nitric acid to obtain a carboxyl modified carbon nano tube, wherein the weight ratio of the concentrated sulfuric acid to the concentrated nitric acid to the carbon nano tube is (40-90): (30-5): (30-5); b) mixing the carboxyl modified carbon nano tube and water soluble alginate in water to obtain the mixture of the alginate and the carbon nano tube; and c) adding a calcium chloride solution to the mixture to obtain the absorptive gel ball. The invention also provides an absorptive gel ball. The absorptive gel ball provided by the invention comprises multiple micro-gel balls in a core shell structure, wherein the core of the micro-gel ball is the carboxyl modified carbon nano tube; and the shell is a calcium alginate polymer. The absorptive gel ball provided by the invention has high absorption efficiency and is suitable for the processing of decoloration of wastewater in the fields such as textile, printing and dyeing, printing ink, leather, rubber, coking, papermaking, pharmacy and the like.

The invention provides a preparation process of blueberry concentrated juice with high content of anthocyanin. According to the preparation process provided by the invention, pectase is adopted for performing enzymolysis on blueberry pulp, chitosan is adopted as a clarifying agent for obtaining clear blueberry juice, a decompression concentration process is adopted for preparing the blueberry concentrated juice, and microwave sterilization is adopted for sterilizing the blueberry concentrated juice. The preparation process comprises the following steps of: selecting blueberry fruits in vaccinium ashei gardenblue species; extracting the blueberry juice, and adding the pectase to perform the enzymolysis on the blueberry pulp; clarifying the blueberry juice, and adding the chitosan as the clarifying agent for obtaining the clear blueberry juice; concentrating the blueberry juice, and adopting the decompression concentration to obtain the blueberry concentrated juice; and performing sterile filling on the blueberry juice, and adopting the microwave sterilization to sterilize the blueberry concentrated juice, wherein the content of soluble solids in the blueberry concentrated juice is 60%-75%, and the content of the anthocyanin is 1.925g/L-3.384g/L. The preparation process provided by the invention can not only effectively prevent the loss of the anthocyanin in the blueberry concentrated juice, but also shorten the concentration time, control the production cost of the preparation process and effectively protect color, luster, fragrance and other sensory qualities of the blueberry juice.

The invention relates to a bionic water collect composite film, which comprises a base with many round micro hydrophilic polymer projections on its above hydrophobic polymer film; said hydrophobic polymer is the polystyrene that doped with 20-30wt% silica dioxide whose average diameter is 2-100nm; the hydrophilic polymer is the polymer of amido, hydroxyl or carboxyl doped with 10-70wt% titania whose average diameter 1-100micrometer; the hydrophobic polymer film comprises one or several of ultraviolet stabilizer, ultraviolet absorber, ozone stabilizer, and antioxidant. The inventive film can collect fog drop or disperse dense fog. The invention has high water collecting efficiency, long service life, and better hydrophilic/ hydrophobic property.