172results about How to "Good temperature sensitivity" patented technology

The invention discloses an intelligent light adjusting film and particularly discloses an intelligent light adjusting film based on a temperature-sensitive polymer hydrogel and a preparation method of the intelligent light adjusting film. A temperature-sensitive polymer and various auxiliaries are dissolved in a polymer hydrogel body without a temperature-sensitive effect to obtain the intelligent light adjusting film with a certain mechanical strength and good temperature sensitivity. The temperature-sensitive polymer, the various auxiliaries, a water-solubility monomer, a cross-linking agent and the like are prepared into an aqueous solution, an initiator is added into the aqueous solution to polymerize the solution to obtain the intelligent light adjusting film. The preparation method of the intelligent light adjusting film is simple in operation and low in cost and can be operated under room temperatures; and the obtained intelligent light adjusting film has certain strength and is good in temperature sensitivity.

The invention discloses a transformer cabinet based on self-feedback uniform heat dissipation. The invention belongs to the field of transformer equipment, a special composite heat dissipation sheet can be additionally arranged on a surface of an existing transformer oil tank, matched lifting heat-absorbing balloons are introduced while the heat dissipation of the oil tank is greatly improved, a self-feedback heat dissipation mechanism arranged on the composite heat dissipation sheet is used for sensing the heat distribution condition on the transformer oil tank; phase expansion is carried outaccording to heat distribution; more lifting heat-absorbing balloons are attracted through the magnetic attraction effect to be in contact for heat transfer; the transfer of heat to the lifting heat-absorbing balloons is accelerated; after absorbing enough heat, the lifting heat-absorbing balloons automatically rise to a cup-shaped outer heat dissipation shell to transfer the heat to the outside;the lifting heat-absorbing balloons serve as intermediate media to play a role in temporary heat storage, a heat conduction bridge between the transformer oil tank and the outside is built, the uniform and efficient heat dissipation and cooling of the transformer oil tank are achieved, and, therefore, the working stability and safety of a transformer are improved.

The invention provides a temperature-sensitive amphiphilic cyclodextrin polymer PCEC (polycaprolactone-polyethylene glycol-polycaprolactone, PCL-PEG-PCL). The polymer provided by the invention is the amphiphilic cyclodextrin polymer which is obtained by linking a PCL-PEG-PCL molecule with beta-CD (cyclodextrin) through utilizing the temperature-sensitive characteristic of a PCL-PEG-PCL triblock copolymer and the inclusion effect of beta-CD on a hydrophobic medicament, can effectively load and slowly release a hydrophobic or water-soluble medicament on the basis of the traditional hydrogel encapsulated water-soluble medicament, has proper critical gel temperature and can form in situ temperature-sensitive hydrogel after injection. According to the invention, the hydrophobic zone of the polymer is obviously enlarged, thereby effectively improving the loading capacity of the hydrogel on the hydrophobic medicament and obtaining high medicament encapsulation rate and medicament loading amount; and simultaneously, the controlled-release effect of the medicament after local injection delivery is realized by utilizing the temperature-sensitive gel performance of the polymer. The polymer provided by the invention has the following chemical structure shown in the specification.

The invention relates to a vessel plug material used in intervene treatment. Wherein, said material is temperature-sensitive nanometer gel system based on polymer N-isopropyl acrylamide (PNIPAAm), which comprises polymer N-isopropyl acrylamide nanometer gel and dispersed medium, while the gel mass percentages is 3-20% and the particle diameter of temperature-sensitive nanometer gel is 50-1000nm. The inventive temperature-sensitive nanometer gel system also can contain developer, soluble antineoplastic. The invention can control the polymer monomer kinds and ratios, the crosslinker amount and the density of temperature-sensitive nanometer gel, to control the sol-gel transformation temperature of said system, and the inventive product has better external flow property and high sol-gel transformation speed, to be used to treat vessel plug, etc.

The invention discloses a preparation method of N-isopropyl acrylamide polymer / polyvinyl alcohol composite hydrogel and a product thereof. The preparation method comprises the following steps: evenly mixing N-isopropyl acrylamide polymer solution having mass fraction of 0.5-1.5% with polyvinyl alcohol solution having mass fraction of 5-20% according to a mass ratio of 0.5-1.5:1, then slowly adding a crosslinking agent which is equivalent to 1-5% of the mass of the mixed liquor obtained, evenly stirring, and keeping standing for 8-24 hours to obtain the N-isopropyl acrylamide polymer / polyvinyl alcohol composite hydrogel. The N-isopropyl acrylamide polymer is a homopolymer of N-isopropyl acrylamide or a copolymer of the N-isopropyl acrylamide and acrylic ester or methacrylate. The preparation method is characterized by simple operation and low cost, and the obtained product is characterized by good temperature sensitivity, stable morphology, not easy leakage and better mechanical property, and has wide application prospect in the intelligent light-control energy-saving material field.

A sensitive material for a flexible temperature sensor. The sensitive material is a composite material with a liquid organosilicon solidified at room temperature as a matrix, and comprises ingredients of, by weight, 100 parts of liquid organosilicon, 8-15 parts of conductive carbon fiber, 1-5 parts of carbon fiber and 8-10 parts of dispersant. Ingredients with a proportioning amount are mixed, dispersed uniformly by ultrasound, injected into a temperature sensor structural model, and solidified at room temperature to obtain the sensitive material. The material has good flexibility and temperature sensitive characteristic, and is suitable for a temperature sensor of any design.

The invention provides a novel temperature-sensitive polymer and a method for preparing the novel temperature-sensitive polymer from L-lysine as a renewable resource, and belongs to the technical field of polymers. The novel temperature-sensitive polymer has a structure shown in the formula (VII). The novel temperature-sensitive polymer is prepared from a renewable resource L-lysine as an initial raw material. The novel temperature-sensitive polymer has an amide structure similar to the structure of poly(N-isopropylacrylamide). Through an ultraviolet spectrophotometer, polymer aqueous solution light transmittance variation with a temperature is determined so that it is showed that the polymer has good temperature sensibility. The invention also provides the method for preparing the novel temperature-sensitive polymer from L-lysine as a renewable resource. The method has simple processes and utilizes the cheap raw materials.

The invention discloses a preparation method for a temperature sensitive response type intelligent ceramic composite membrane and a product. The product is obtained by chemical graft copolymerization of N-isopropyl acrylamide on the surface of a ceramic membrane. The invention takes the ceramic membrane as a basement membrane, takes the N-isopropyl acrylamide as a functional monomer, and adopts a method of chemical graft to prepare the temperature sensitive response type intelligent ceramic composite membrane. The prepared intelligent ceramic composite membrane can overcome the disadvantage of low mechanical strength of an intelligent membrane prepared taking an organic membrane as the basement membrane, has favorable chemical stability, long service life and the environmental sensitivity of a graft monomer, and is easy to disinfect and clean.

The invention relates to a fiber sensor, particularly relates to a multifunctional sensor with microstructure fiber surface plasma resonance and a preparation method thereof. The two sides of the photonic crystal fiber substrate of the fiber are provided with fan-shaped openings that surface of which are plated with gold films. Tips of the bottom ends of the fan-shaped openings are provided with silver nanowires. The core of the photonic crystal fiber substrate is provided with a magnetic fluid, and the outer side of the core is provided with a cladding air hole. The preparation method comprises the steps of: polishing the fan-shaped openings on the photonic crystal fiber; filling the silver nanowires; uniformly plating the gold films on the surface of the fan-shaped openings; pressing themagnetic fluid into the photonic crystal fiber from a small tube; and coupling and splicing the two ends of the common single mode fiber and the photonic crystal fiber through the self-calibrating function of the a fiber fusion splicer. The sensor of the invention can achieve the analysis and detection of the external magnetic field intensity, the refractive index of the to-be-measured liquid andthe external temperature in one time, therefore, the technical defects that the conventional detection technology is complex in operation, low in detection sensitivity and non-real time online detection are overcome.

The invention discloses a preparation method of nano-TiO2-modified composite hydrogel. The method comprises steps as follows: dissolving chitosan in an acetic acid solution, mixing the solution with N'N-methylene bisacrylamide, nano-TiO2 and NIPAAm (N-isopropyl acrylamide) to obtain a mixed solution, adding an initiator and TMEDA (tetramethylethylenediamine) to the mixed solution to obtain a nano-TiO2-modified composite hydrogel coarse product after reactions, and performing post-treatment to obtain the nano-TiO2-modified composite hydrogel. The prepared nano-TiO2-modified composite hydrogel is used as a photocatalyst and an adsorbent to be applied to wastewater treatment. According to the preparation method of the nano-TiO2-modified composite hydrogel, the inorganic nano-material TiO2 is added, so that the stability of the chitosan hydrogel can be improved, the nano-TiO2-modified composite hydrogel can be used as the good photocatalyst and the good adsorbent to be applied to dye wastewater treatment, temperature-sensitive hydrogel can be separated from a reaction system quickly by the aid of the anti-phase conversion characteristic of PNIPAAm, and secondary pollution can be avoided.

The present invention is polyethylene modified asphalt agglomerate and its making process. The material includes the components of polymer 50-85 wt%, asphalt 10-35 wt%, grafting modifier 0.5-3.0 wt%, chemical initiator 0.1-1.0 wt%, crosslinking agent 1.0-3.0 wt%, compatibilizer 1.0-4.0 wt% and assistant 0.1-8.0 wt%. The preparation process includes mixing the polymer and the assistant inside a mixer, heating to melt asphalt, and adding all the components into a double-screw extruder to prepare modified asphalt agglomerate. The modified asphalt agglomerate has high elasticity restoring rate, high strength, high weather resistance, simple preparation process, and low production cost.

The invention belongs to the field of waterproof coil production process, and relates to a production process for preparing a polymer modified asphalt waterproof coil. The process comprises the following steps: mixing a polymer modifier with an anti-aging agent, adding the mixture into a feeding device of a main extruder; freezing and crushing asphalt, adding plasticizer to mix with the asphalt, uniformly mixing, then gradually adding filler for stirring and mixing; adding the mixture into a feeding device of an auxiliary extruder, starting the main extruder, starting the auxiliary extruder when the polymer modifier is plasticized and reaches the melting section of the main extruder, and connecting the auxiliary extruder with the tail end of the charging section of the main extruder; enabling the polymer modified asphalt to pass through the cooling section of the main extruder, setting vacuum exhaust at the tail end of the cooling section; feeding the polymer modified asphalt into a net changing section, coating to a waterproof coil base material by virtue of a flat die; and compounding an isolation protecting layer to the surface of the polymer modified asphalt. According to the process, the polymer is plasticized completely, the heating time for the polymer is reduced, the waterproof coil base material is directly coated with the polymer modified asphalt, and the process is simple.

The invention provides a PCLm-PEG6000-PCLm thermo-sensitive self-assembled tri-block copolymer, wherein the copolymer presents two-phase transition characteristics, and can be applied to a controlled release drug delivery system as a drug carrier or can be applied to tissue engineering as a biodegradable material. The invention further provides a pharmaceutical composition containing the tri-block copolymer, and a preparation method and an application of the pharmaceutical composition. A system consisting of PCLm-PEG6000-PCLm tri-block copolymer and water can both load water-soluble drugs, and can efficiently load water-insoluble drugs, and has an excellent controlled-release effect.

The invention discloses natural compound modified asphalt and a preparation method thereof. The modified asphalt is prepared by utilizing the following materials according to the following weight parts: 30 parts to 95 parts of basic asphalt, 5 parts to 70 parts of Trinidad lake asphalt (TLA) and 1 part to 40 parts of rock asphalt. The method comprises the technical processes of: melting the basic asphalt at a temperature of 120 DEG C to 140 DEG C; melting the TLA at a temperature of 165 DEG C to 195 DEG C; and mixing the melted basic asphalt and the melted TLA and stirring the mixture of the basic asphalt and the Trinidad lake asphalt for 10 min to 50 min at ta temperature of 165 DEG C to 195 DEG C, and adding rock asphalt powder in the stirring process so as to obtain the finished product. The modified asphalt can improve temperature sensibility, increase the stability, deformation resistance, toughness, cracking resistance performance, anti-fatigue and cracking-resistant strength and durability, prolong the service life of the road and reduce the time for maintenance and overhaul and the maintenance cost; simultaneously the modified asphalt has excellent environment-friendly performance and can reduce pollution generated in the production process of a polymer modifier.

The invention discloses a temperature sensitive polymer material with biodegradability and biocompatibility. A preparation method of the material comprises the following steps of: firstly synthesizing monomers with specific structures by using the basic raw materials including lysine, tartaric acid, and malic acid, and carrying out polymerization reaction on the monomers with different ingredients to prepare the heterochain type polymer material. The polymer not only has good temperature sensitivity, but also has good biodegradability and biocompatibility. The preparation method disclosed by the invention is simple and easy to implement and has good industrial prospect.

The invention discloses a salix mongolica / polyvinyl chloride wood-plastic composite material and a production method thereof. The salix mongolica / polyvinyl chloride wood-plastic composite material comprises the following components in parts by mass: 100 parts of polyvinyl chloride, 40 parts-60 parts of salix mongolica wood powder, 2 parts-6 parts of coupling agent, 3 parts-5 parts of lead salt compound stabilizer, 0.3 part-0.7 part of calcium state, 0.1-0.3 part of stearic acid, 0.1-0.4 part of paraffin and 1 part-4 parts of chlorinated polyethylene. The production method of the salix mongolica / polyvinyl chloride wood-plastic composite material comprises the following steps of: (1), preparing the salix mongolica wood powder; (2), drying the raw materials; (3) weighing the raw materials according to proportions; (4) pretreating the salix mongolica wood powder; (5) stirring and heating; (6) extruding and pelleting; and (7) cutting, drying and packaging. The salix mongolica / polyvinyl chloride wood-plastic composite material has the advantages of corrosion resistance, moisture protection, easiness in processing, high strength, good durability, strong adjustability, wide source of raw materials, low cost and capability of reducing environmental pollution.

The invention discloses a smart dimming film and a preparation method thereof. A temperature-sensitive polymer and various assistants are dissolved in a sodium alginate aquagel main body without temperature-sensitive effect to obtain a smart dimming film with certain mechanical strength and favorable temperature sensitivity. The preparation method comprises the following steps: preparing the temperature-sensitive polymer, various assistants, sodium alginate and the like into a water solution, and adding a water-insoluble multivalent metal salt and an acid-releasing agent to slowly form a cross-linked gel, thereby obtaining the smart dimming film. The preparation method disclosed by the invention is simple to operate and low in cost, and can be performed at room temperature; and the obtained smart dimming film has certain strength and favorable temperature sensitivity.

The invention relates to a rare-earth element-containing up-conversion luminescent temperature sensitive material as well as a preparation method and application thereof. The luminescent material has a general chemical formula of (A0.5Re0.5)TiO3, wherein A is selected from one or more of Rb, K, Na, Li and Ag, and Re is selected from one or more of Er, Yb, Pr, Eu, Ho, Tm, Tb and Dy. The sensitive material can be used for preparing the material provided by the invention, and the luminescent material prepared by the method provided by the invention has excellent up-conversion luminescent performance and temperature sensitivity, high luminescent intensity, good temperature sensitivity, a wide application temperature range, stable chemical performance and a controllable physical size, is easy to prepare, is relatively low in cost, and has a wide application prospect in the fields of fluorescent temperature sensors, short-wave emission solid lasers, biological molecular fluorescence labeling, infrared detection and anti-counterfeiting, three-dimensional display, photoelectric integrated devices, solar batteries and the like.

The invention discloses a preparation method of thermosensitive composite gold nanoparticles, which comprises the steps of providing an aqueous dispersion of gold nanoparticles, heating to 50-70 DEG C, quickly adding into a thermosensitive polymer solution with an active group which can be combined with gold, and sufficiently mixing for reacting; after the mixed reaction solution is naturally cooled, separating out solid products therein, and cleaning to obtain the thermosensitive composite gold nanoparticles, wherein the gold nanoparticles are preferably the gold nanoparticles with surfaces modified by citric acid radicals, and the thermosensitive polymer with an active group which can be combined with gold is preferably the amino-terminated poly N-isopropylacrylamide (PNIPAM). The preparation method disclosed by the invention has the advantages of mild conditions and short reaction time, is simple and easy to implement, and is environment-friendly; moreover, the obtained product has relatively high yield, relatively good uniformity and good thermosensitivity, and can be widely applied to the fields such as biological optical sensing, medical fluorescence imaging and the like.

The invention discloses a tungstate upconversion luminescence temperature sensitive material doped with rare-earth elements Er and Yb and a preparation method thereof, and belongs to the technical field of a luminescence material. A general chemical formula of the luminescence material is MWO4: xEr, yYb, wherein x is more than or equal to 0.025mol% and less than or equal to 2.0mol%, x: y=1: 10 (molar ratio), and in the general formula, M is selected from one or more of Zn, Mg or Ba. The prepared luminescence material has good upconversion luminenscence performance, is high in luminous intensity, excellent in temperature sensitive performance, high in sensitivity and wide in application temperature area and has wide application prospect in the fields such as a fluorescent temperature sensor, a biological molecular fluorescence marker, infrared detection and anti-counterfeiting, three-dimensional display, solar battery and the like.

The invention relates to a method for wet modification of emulsified asphalt with nano-clay / styrene butadiene rubber and belongs to the technical field of road asphalt. Matrix asphalt and an emulsifier are mixed to form emulsified asphalt, emulsified asphalt is modified with a modifier prepared from nano-clay and styrene-butadiene latex through high-speed stirring, a high-speed shearing machine is used as dispersion equipment, and the specific preparation process comprises emulsion blending and shearing mixing. The prepared modified emulsified asphalt overcomes defects that traditional modified emulsified asphalt is not easy to mix uniformly, poor in storage stability and the like. The preparation method is good in feasibility and easy to operate, has the simple technology and has the good application effect and practical value.

The invention discloses a thermo-sensitive filling gel preparation for rhinology, a preparation method of the thermo-sensitive filling gel preparation and an application of the thermo-sensitive filling gel preparation in operation on nasal cavity and paranasal sinuses. The preparation comprises components in percentage by weight as follows: 3%-20% of chitosan, 0.3%-3% of cellulose, 15%-25% of poloxamer and 52%-81.7% of an alkaline buffer solution. The prepared filling gel preparation for the rhinology is thermo-sensitive and has lower viscosity when the preparation does not enter a human body, so that gel can be pushed out easily; the viscosity and adhesive power of the gel are increased due to increase of the temperature when the preparation enters the human body, thus, the gel is not prone to flowing out of the nasal cavity, the time consumed for action with the wound can be effectively prolonged, and the effectiveness of a product is improved. The preparation method is simple, the product has a good filling function in the operation on the nasal cavity and the paranasal sinuses, can effectively prevent nasal mucosa from surface adhesion, control mild bleeding, prevent infection and assist in natural healing, and can be naturally degraded or washed after 7-14 days and is convenient to use.

The invention relates to a poly epsilon-CL / poly N-alkyl acrylamide graft multipolymer and an application of the same. The graft multipolymer is a random copolymer copolymerized by 4-carbonyl group-epsilon-CL and epsilon-CL through the random copolymerization and has a molecular weight of between 10,000 and 100,000 as well as is obtained by the reduction reaction and the esterification reaction with the polymer shown by the expression C, wherein, R1, R2 and R3 are respectively selected from one of H or C1-C6 alkyl; moreover, at least one of R2 and R3 is C1-C6 alkyl; the molecule weight of the polymer shown by the expression C is between 1,000 and 20,000; n is between 1 and 6.

A preparation method and an application of a tubular tungsten oxide-graphene composite material are disclosed. The invention belongs to the technical field of advanced materials, and specifically relates to a preparation method and an application of a tubular tungsten oxide-graphene composite material. The invention aims to enhance the temperature sensitivity of a graphene material by preparing a tungsten oxide-graphene composite material. The method comprises the following steps: (1) oxidizing graphite into graphite oxide powder; (2) ultrasonically dispersing the graphite oxide powder in normal propyl alcohol, and adding tungsten hexachloride for hydrothermal reaction; and (3) adjusting the pH value to 9-10, adding 50% aqueous solution of hydrazine hydrate, conducting reaction in oil bath, and carrying out centrifugal cleaning and drying after reaction to get black powder, namely, the tubular tungsten oxide-graphene composite material. The material can be used as a temperature-sensitive material of temperature sensors, a sensitive material of gas sensors or a photocatalytic degradation material.

The invention discloses a hardware synchronization method of a cascading instrument. The hardware synchronization method of the cascading instrument includes that main control modules of a plurality of instruments conduct information interaction through Ethernet, distribute addresses according to position order of a series link which is formed by connecting synchronous modules, and confirm an instrument which is located in a first position in the link. When synchronization needs to be conducted, the main control module of the first position instrument sends synchronous configuration requirements to the main control modules of other position instruments through the Ethernet and sends synchronous instructions to the synchronous modules of the instrument. The other instrument main control modules receive the synchronous configuration requirements through the Ethernet, finish synchronous configuration of the instrument, and meanwhile the synchronous modules of the instrument receive synchronous input signals and clock input signals through an input signal wire. After the synchronous input signals and the clock input signals are processed by the synchronous modules in the instrument, one path sends out the synchronous input signals and the clock input signals through the output signal wire and the other path is led to other function circuits of the instrument to conduct synchronization operation, so synchronization of all instruments in a system can be finally achieved.

The invention relates to a method of MR imaging of an object (10) placed in the examination volume of a MR device (1). It is the object of the invention to provide an improved MR-based temperature mapping method. The method of the invention comprises the steps of: subjecting the object (10) to an imaging sequence of RF pulses and switched magnetic field gradients, which imaging sequence is a stimulated echo sequence including: a) at least two preparation RF pulses (a) radiated toward the object (10) during a preparation period (21), and b) one or more reading RF pulses (β) radiated toward the object (10) during an acquisition period (22) temporally subsequent to the preparation period (21); acquiring at least two MR signals during the acquisition period (22), wherein the two MR signals are either (i) a FID signal (I1, FID) and a stimulated echo signal (I2) or (ii) two stimulated echo signals (STE, STE*); and deriving a temperature map indicating the spatial distribution of the temperature within the object (10) from the at least two acquired MR signals. Moreover, the invention relates to a MR device (1) and to a computer program for a MR device (1).

The invention provides a thermo-sensitive condom based on waterborne polyurethane and a preparation method thereof. The preparation method of the thermo-sensitive condom comprises the following steps:(1) taking polyester diol, low-molecular-weight polyether glycol and high-molecular-weight polyether glycol as soft segments, taking diisocyanate and a chain extender as hard segments, carrying out aprepolymerization reaction, and carrying out a chain extension reaction, a cross-linking reaction and an emulsification process to obtain a polyurethane aqueous emulsion, wherein the number-average molecular weight of the low-molecular-weight polyether glycol is 400-1000, the number-average molecular weight of the high-molecular-weight polyether glycol is 2000-5000, and the use amount of the polyester glycol accounts for not more than 5% of the total weight of solids in the aqueous emulsion; and (2) subjecting the aqueous polyurethane emulsion to dipping molding, hemming drying and demoldingso as to obtain the thermo-sensitive condom. The thermo-sensitive condom has the advantages of low modulus, soft product, high somatosensory comfort, thorough elimination of foreign body sensation, excellent tensile strength, safety guarantee, and difficult damage.

The invention discloses a salix psammophila / polyethylene wood-plastic composite material and a preparation method thereof. The salix psammophila / polyethylene wood-plastic composite material is prepared from the following ingredients in percentage by mass: 30-40% of salix psammophila wood powder with the granule diameter of 40-80 meshes, 30-40% of polyethylene, 15-30% of high density polyethylene, 2-6% of light calcium carbonate, 1-3% of coupling agent, 1-3% of lubricant and 1-5% color master batch. The preparation method of the salix psammophila / polyethylene wood-plastic composite material comprises the following steps of: (1) preparing the salix psammophila wood powder; (2) drying raw materials; (3) weighing the raw materials in proportion; (4) pretreating the salix psammophila wood powder; (5) stirring and heating; (6) carrying out extrusion granulation; and (7) cutting, drying and packaging. The salix psammophila / polyethylene wood-plastic composite material has the advantages of corrosion resistance, moisture resistance, easiness in preparation, high strength, good durability, strong adjustability, wide range of sources of raw materials, low cost and environmental pollution reduction.

The invention relates to a bracket with a drug temperature-sensitive controlled-release function, which consists of a supporting bracket and a drug-carrying coating which covers the surface of the bracket, wherein the drug-carrying coating is formed by applying the coating with the drug temperature-sensitive controlled-release function on the surface of the bracket in the modes of spin coating, dip coating or spray coating. The invention also provides a coating with the drug temperature-sensitive controlled-release function and the application thereof. The coating with the drug temperature-sensitive controlled-release function has good temperature sensibility and drug controlled release function, can be evenly applied on the surface of bracket material. The drug-carrying bracket can effectively kill cancer cells and restrain the proliferation of nude mouse cancer transplantation tumor.