108results about How to "Extract safe" patented technology

A hearing aid and handling tool is provided, where the hearing aid has all parts thereof inside the ear canal and comprise a casing part with a retention element extending radially between the casing part and the circumference of an ear canal of a user. A sound exit is provided at a first side of the retention element and mechanical connection parts are provided at an opposed side of the retention element. According to the invention complementary mechanical connection parts are provided at the handling tool.

The invention relates to a method for extracting acid-soluble collagen from fish skin and an acid-soluble collagen product extracted by the method. The method comprises the following steps: removing impure protein and fat of the fish skin; extracting the acid-soluble collagen, dialyzing, performing freeze-drying and the like. The acid-soluble collagen product extracted by the method keeps an integral structure and is not degradable; and the acid-soluble collagen product has a denaturation temperature similar to that of collagen from a large terrestrial animal, can be used as a substitute for the collagen from the large terrestrial animal, and has a potential application value.

Some embodiments provide an attachment for adapting an examination tool to identify a foreign object within a small orifice and to safely extract the foreign object using the examination tool. In some embodiments, the attachment is an enhanced otoscope cover for adapting an otoscope to simultaneously examine the ear canal and remove accumulated cerumen from the ear canal. The attachment includes a cover to couple the attachment to the otoscope and to provide a focal view point for the attachment. The attachment includes a support that extends from the cover. An extraction tip is located at the end of the support and is used to engage and extract cerumen and other objects.

An image processing device extracts graphic areas, for example, firstly from image data received, and then extracts other remaining areas, i.e., photographic and character areas. The areas that are extracted firstly can be photographic or character areas. This prevents the areas to be extracted firstly from being extracted accompanying with other areas under the influence of isolation processes to be executed on other areas. The image processing device also can establish the order of extraction of each area depending on the contents of the image data based on the user's operation.

A packoff nipple is provided for sealing an annular space in a well pipe. The packoff nipple generally comprises a tubular body and a sealing assembly positioned around the tubular body and axially moveably thereon. A stop restrains the sealing assembly from extruding in to the annular space. The sealing assembly includes one or more elastomeric sealing rings having a circumferential groove formed in a downhole face. An axially moveable actuator, preferably a packer cup, engages the sealing ring assembly to causes at least an expansion portion of the sealing rings to expand radially outwardly to seal the annular space and the sealing ring assembly to contact the uphole stop. The sealing rings are axially compressed between the uphole stop and the actuator to further expand the sealing rings. Preferably the uphole stop is concave to urge the sealing rings away from the well pipe and thus further avoid extrusion. As the sealing rings are not extruded past the uphole stop or otherwise permanently deformed, the packoff nipple is reusable and thereby cost-effective.

The invention relates to a device (1) for the drilling, notably by percussion or rotary-percussion drilling, and draining of holes in soil or rock. A drill bit (2, 3) mounted on a drill rod (4) creates a bore hole and a jacket tube (6) is coupled to the drill rod (4) or the drill bit (2, 3). In the area adjacent to the drill bit (2, 3) the jacket tube (6) has at least one through hole which opens into an annular space embodied between the drill rod and the jacket tube. In the end area adjacent to the drill bit (2, 3) the jacket tube (6) is surrounded by at least one filter tube (7) having a plurality of through holes or slits (8) which are distributed especially evenly across its circumference. This allows for correspondingly safe and reliable drainage during boring, using simple measures.

A packoff nipple for sealing an annular space in a well pipe has a tubular body, a sealing assembly positioned around the tubular body capable of axial movement along the tubular body and a stop to restrain the sealing assembly from extruding into the annular space. The sealing assembly includes one or more elastomeric sealing rings having a circumferential groove formed in a downhole face. An axially moveable actuator, such as a packer cup, engages the sealing ring assembly to cause at least a portion of the sealing rings to expand radially outwardly to seal the annular space and cause the sealing ring assembly to contact the uphole stop. The sealing rings are axially compressed between the uphole stop and the actuator to further expand the sealing rings. The uphole stop may be concave to urge the sealing rings away from the well pipe to avoid extrusion or permanent deformation.

The invention relates to the technical field of snow chrysanthemum extraction, and discloses an antioxidant active extract of snow chrysanthemum and a preparation method thereof. The antioxidant active extract of the snow chrysanthemum is prepared by the following preparation method: firstly, extracting by using an ethanol water solution after crushing the snow chrysanthemum and then carrying out vacuum concentration to obtain an ethanol extract; adsorbing by using macroporous resin, eluting by using an ethanol water solution, carrying out vacuum common peony and drying to obtain the antioxidant active extract of the snow chrysanthemum after extracting by petroleum ether, trichloromethane and ethyl acetate sequentially. The result of an experiment of the antioxidant active extract of the snow chrysanthemum obtained by the method in the ability of removing and restoring DPPH and ABTS free radicals proves that the antioxidant active extract of the snow chrysanthemum disclosed by the embodiment of the invention has good antioxidant action; the process disclosed by the invention is simple and convenient to operate, safe and reliable in extraction process, and is a technique capable of effectively extracting the antioxidant active extract of the snow chrysanthemum.

The invention belongs to the technical field of chemical invention, particularly relating to a preparation method and application of refined ostrich oil. The preparation method of the ostrich oil comprises the following steps: taking ostrich fat tissue as a raw material, mincing, putting into an extraction device, adding water, pressurizing to extract, and filtering and separating to obtain crudeostrich oil; melting the crude ostrich oil, adding dilute aqueous alkali, stirring, standing for layering, and collecting an oil phase; carrying out centrifugal dehydration after an oil layer is melted; collecting an upper layer of clarified oil phase; and drying in vacuum to remove trace moisture so as to obtain the refined ostrich oil. The ostrich oil disclosed by the invention can be used for preparing cosmetics, medical paste and body surface inflammation resistant drug. The preparation method has the advantages of simple technology, small equipment investment and high yield, is convenient to operate, does not contain organic solvent and is environmentally-friendly.

A method of removing a residual gas from inside a conventional shipping container is disclosed. The method first involves the step of accessing the container by opening a door of the container and fitting a panel to the open door space. Next the method involves extracting at least some of the residual gas present in the container via an outlet valve located at the panel using an external suction pump. Finally the method involves providing a flow of a flushing gas into the container via an inlet valve located at the panel to flush residual gas from the container. The total pressure of gases in the container can be monitored and controlled by adjusting the flow of gases in the inlet and outlet holes or valves.

The invention belongs to the technical field of extraction of polysaccharides, and particularly relates to a method for extracting and purifying lentinan. The method comprises the following steps: drying mushrooms at 40-80 DEG C, and crushing the dry mushrooms into 20-100-mesh powder; heating the mushroom powder in a water bath kettle of which the leaching temperature is 60-100 DEG C for 60-150 minutes, and then filtering to remove impurities; slowly adding 0.5-5% of chitosan liquid, flocculating, filtering, evaporating and concentrating the filtrate to be 1 / 2 to 1 / 4 of original volume; centrifuging, taking supernate, adding ethanol, carrying out alcohol-precipitation and standing for 24 hours, filtering, removing the supernate, and drying, so as to obtain a lentinan product. The method is improved on the basis of a hot water extraction method; the extraction rate is improved; compared with the prior art, the method is simple in technological process, easy to operate, relatively low in cost, and low in impurity content; and large-scale production can be achieved.

The invention belongs to the technical field of high-molecular materials, and discloses a low-odor ABS material used for 3D printing and a preparation method of the low-odor ABS material. The low-odorABS material comprises the following raw materials: 82.5-99.1% of ABS resin, 0.1-2% of an antioxidant, 0.5-3% of a compatibilizer, 0.1-0.5% of a heat stabilizer, 0.1-2% of a deodorant, and 0.1-10% ofa plasticizer. The preparation method of the low-odor ABS material used for the 3D printing disclosed in the invention adopts a combination of a gas extraction technology and the deodorant for use, and has the characteristics of a pure product, simple operation and wide application prospects, and the low-odor ABS material has high printing precision, and does not block spray heads of a 3D printing machine.

The invention relates to a method for extracting active substances from a wolfberry, in particular to a method for extracting zeaxanthin and a derivative of the zeaxanthin from the wolfberry. The method comprises the steps of performing sugar reduction on the wolfberry, drying 10 kg wolfberry, grinding into 100 meshes, putting the wolfberry in a supercritical extraction kettle for extraction, merging and collecting an extract for 0.6-3 h to obtain the zeaxanthin and the derivative of the zeaxanthin. The method does not use an organic solvent in the whole process, and is safe and efficient, technical parameters are applicable to pilot-plant-scale production, and the purity reaches 80% or above.

The invention relates to a process for extracting gentiopicrin from flowers of gentiana straminea. The process is as follows: after the dried flower of gentiana straminea is crushed, cold maceration and extraction is carried out at room temperature taking alcohol as an extraction solvent, and gentiopicrin with higher purity is obtained through concentration, absorption and drying. The invention makes a study of the extraction and preparation process of gentiopicrin in gentiana straminea for the first time, determines the optimal cold maceration and extraction conditions and the purification process of the gentiopicrin in the gentiana straminea, and meets the requirements of developing various medicines taking gentiana straminea as main raw materials.

The invention discloses a method for aqueous two-phase extraction, separation and purification of dendrobium officinale polysaccharide. The invention aims to provide the method for aqueous two-phase extraction, separation and purification of the dendrobium officinale polysaccharide. The method has the advantages that an extraction rate, a deproteinization rate and purity are greatly improved. According to a technical scheme in the invention, the method comprises the following steps: drying and crushing fresh stems of dendrobium officinale; dissolving dendrobium officinale powder in water according to a material-liquid mass-volume ratio of 1g: (15-30) ml, conducting extracting twice at 50-60 DEG C, wherein extracting lasts for 1-3 hours each time, combining the two extracts, carrying out filtering, performing centrifuging at 6000-8000 r / min for 10-15 minutes, taking a supernatant, and concentrating the supernatant to 20-40 ml; adding 95% ethanol, carrying out uniform shaking, performing refrigerating at 4 DEG C for 8-12 hours, carrying out centrifuging, collecting a precipitate, freeze-drying the precipitate for 2 days, grinding the precipitate to obtain white crude polysaccharide powder, and dissolving the white crude polysaccharide powder with hot water to obtain a crude polysaccharide solution with a concentration of 0.5-5mg / mL; and adding an ethanol-ammonium sulfate mixed solution, conducting standing for layering, carrying out extracting at 15-55 DEG C, retaining a lower-phase substance, conducting concentrating at 60 DEG C under reduced pressure, adding ethanol, carrying out standing overnight, then performing centrifuging, collecting a precipitate, and freeze-drying the precipitate to obtain the pure dendrobium officinale polysaccharide.

The invention relates to the field of technical research of stem cells and provides a preparation method of freeze-dried powder containing stem-cell active factors excreted by human mesenchymal stem cells. Provided human adipose-derived stem cell raw materials are sufficient in source, safe and convenient to extract and safe and reliable in use and do not produce any untoward effect. The preparation method specifically comprises the following steps of exogenous factor detection, primary isolation, culture and cell passage of adipose-derived stem cells, identification of mesenchymal stem cells,collection of supernate, preparation of the freeze-dried powder, detection on the supernate and active factors of the stem cells of the freeze-dried powder and solvent preparation and filling. The prepared freeze-dried powder is easy to store and transport compared with the supernate, the activity of the factors is effectively saved, the freeze-dried powder can be applied to the beauty industry,the cell factor content is high, the moisture content in the freeze-dried powder is low, and accordingly the freeze-dried powder is easy to store. The freeze-dried powder prepared by adopting the preparation method is adopted after scalding, and the heal rate is high when the compound prepared from biological polysaccharide gel, collagen, folic acid and sterile ultrapure water is applied to wounds.

A slip fit quick disconnect pipe coupler having an insertion portion and a housing portion which mate to form a sealed coupling between pipes. The coupler uniquely provides positive pipe coupling with extreme ease of disassembly or dis-connection of two pipes. The coupler utilizes a uniquely designed L-shaped tool which allows quick decoupling and easy removal of the separated insertion portion and attached pipes without the need for a plumbing technician to lean or crawl into the space occupied by the coupler.

The invention relates to a quick elevator for a drill rod. The quick elevator comprises an elevating cylinder, an elevating ring and a locking ring, wherein the elevating ring is fixed at the upper end of the elevating cylinder; the elevating cylinder is provided with an open chamber for clamping a joint of the drill rod; the locking ring is sleeved on the elevating cylinder and can freely rotate and slide up and down; a limiting flange preventing the locking ring from dropping is arranged on the outer wall at the lower end of the elevating cylinder; a positioning member is convexly arranged on the outer wall of the elevating cylinder; a groove parallel to the axial direction of the inner wall of the locking ring is arranged on the inner wall of the locking ring; the groove correspondingly fits with the positioning member; and the positioning member can freely pass through in the groove. The quick elevator provided by the invention has a simple, skilful and reasonable structure, can firmly clamp the drill rod and lock with the locking ring, is safe and reliable and prevents tripping; the quick elevator provided by the invention is conveniently connected with the drill rod and can safely and quickly extract lots of drill rods in the drilling construction process; and moreover, compared with other elevators, the quick elevator provided by the invention has a few parts, realizes safe and quick extraction of the drill rod by use of a simplest structure, has low cost and is convenient to manufacture and suitable for large-scale popularization and application.

The invention relates to a nucleic acid extraction kit and a nucleic acid extraction method, the nucleic acid extraction kit comprises a magnetic nanoparticle solution, a chelate resin suspension, a protease K solution, a washing solution and an eluent, the magnetic nanoparticles are effectively modified and pretreated by chitosan, and the proper pH value of the solution is controlled to adsorb and desorb nucleic acid; the chelating resin has dual functions of mechanical lysis of cells and specific adsorption of non-nucleic acid impurities, the washing liquid is used for washing magnetic nanoparticles and absorbing and discarding protein, lipid and cell debris in a solution, and the eluent is used for fully releasing nucleic acid adsorbed on the magnetic nanoparticles to obtain a nucleic acid solution. The nucleic acid extraction process is convenient and fast, toxic and harmful reagents such as lysate, high chaotropic salt and organic solvent or amplification reaction inhibitors are not needed, the extraction process is safe, simple and convenient, the purity and concentration of the extracted nucleic acid are improved, and the obtained nucleic acid solution can be directly applied to subsequent PCR.

The invention discloses a fish collagen peptide which mainly comprises fish skin, protease, net activated carbon and arsenic removal resin. The preparation method comprises the following steps: (1) adding the fish skin into the protease for performing enzymolysis, inactivating the protease, and obtaining a crude extract of the collagen; (2) adding the net activated carbon into the crude extract of the collagen obtained in the step (12) for stirring, discoloring and removing the fishy smell, and filtering to obtain collagen liquor; (3) allowing the collagen liquor obtained in the step (2) to flow through the arsenic removal resin, washing an arsenic removal resin exchange column by using purified water, and collecting the eluant; and (4) evaporating and concentrating the eluant in the step (3), performing spray drying, and obtaining the fish collagen peptide with the molecular weight of 2000-3000Daltons. The fish collagen peptide is extracted by utilizing various fishes, is safe, sanitary and harmless and is high in economic benefits and simple in preparation process.

The invention discloses a magnetic bead-based viral nucleic acid extraction method and a kit. The extraction method comprises the following steps: uniformly mixing a biological sample and a lysis solution to obtain a lysis reaction system; the cleavage reaction system carrying out a reaction, and after the reaction is finished, absorbing nucleic acid through magnetic beads to obtain the magnetic beads adsorbed with the nucleic acid; washing the obtained magnetic beads adsorbed with the nucleic acid, and then eluting the nucleic acid to obtain biological sample nucleic acid; wherein the lysis solution contains a chaotropic agent, a metal chelating agent, sodium ions, a nonionic surfactant and polyethylene glycol. According to the magnetic bead-based virus nucleic acid extraction method, protease K and a PolyA solution are not needed in the nucleic acid release process, and pollution caused by operation is reduced to the maximum extent. The extraction method is convenient and simple to operate, can greatly reduce labor cost and time cost, and is suitable for high-throughput extraction.

A network switch with a plurality of crossbar switches that is available to suppress increase in the circuit scale is provided. The network switch has: the plurality of crossbar switches that transfer unit data in a specified format; a receiving side transfer unit that transfers data received from a network to the plurality of crossbar switches in the unit data basis; and a plurality of transmitting side transfer units that transmit data transferred from the plurality of crossbar switches to the network. The receiving side transfer sets a consecutive serial number to the unit data in transfer sequence, and distributes the unit data to the plurality of crossbar switches. Each of the plurality of transmitting side transfer units has a plurality of queues for the respective crossbar switches that stores the transferred unit data, and extracts the unit data with smallest serial number of the unit data stored in the queues when all of the queues store the unit data.

The invention discloses a kit for viral nucleic acid extraction and an extraction method thereof, and belongs to the technical field of nucleic acid extraction. The kit for the viral nucleic acid extraction comprises a lysis solution, a protein removal solution, an absorption promoting solution, a scrubbing solution, an eluant and a purification column, wherein the lysis solution is prepared from3-7mol / L guanidinium isothiocyanate, TritonX-100 with the volume concentration of 0.6%-1%, 30-50mmol / L Tris-HCl and 30-50mmol / L urea, and a pH value of the lysis solution is 4.3-4.6; and in addition,components and content of the protein removal solution, the absorption promoting solution and the scrubbing solution are limited, the kit is cheap, and the extraction method of the kit for the viral nucleic acid extraction can efficiently and stably extract viral nucleic acid.

The invention discloses a traditional Chinese medicine composition capable of reducing the blood pressure and tonifying the kidney and a preparation method and application thereof. The traditional Chinese medicine composition is prepared with the following raw materials in parts by weight: 30-100 parts of sticktight, 10-30 parts of radix polygoni multiflori preparata and 3-15 parts of dogwood. In the preparation method, the traditional Chinese medicine ratio and formula of the traditional Chinese medicine composition provided by the invention are determined based on syndrome differentiation and treatment in accordance with the theory of traditional Chinese medicine, and the results of pharmacological experiments show that the traditional Chinese medicine composition provided by the invention has a good function of reducing the blood pressure with lasting stable effect and no recurrence, improving the biochemical indicators of the blood of patients with high blood pressure, basically preventing and treating hypertensive diseases, obviously preventing the hypertension-induced nephropathy and protecting the kidney. Moreover, the dosage of the traditional Chinese medicine composition provided by the invention is small, and no adverse reaction occurs in the experiment. Therefore, the traditional Chinese medicine composition can be used for treatment of hypertensive diseases and complications of hypertensive diseases and renal diseases.