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52results about How to "Less activity" patented technology

Method for separating active ingredients from aquilaria sinensis lamina by utilizing high-speed countercurrent chromatography

The invention discloses a method for separating active ingredients from an aquilaria sinensis lamina by utilizing a high-speed counter current chromatography. The method comprises the following steps of: extracting the dried and smashed aquilaria sinensis lamina by virtue of a percolation extract method at the room temperature to obtain an aquilaria sinensis lamina extracting solution extractum; extracting the extracting solution extractum for 3-4 times by sequentially utilizing petroleum ether,and ethyl acetate, respectively decompressing and concentrating a petroleum ether extract liquor and an ethyl acetate extract liquor to extractums; then respectively separating the petroleum ether part extractum and the ethyl acetate part extractum to obtain an active ingredient A of 7,4'-dimethoxy-5-hydroxy flavone by utilizing the high-speed counter current chromatography; and then separating the ethyl acetate part extractum through high-speed countercurrent chromatography to obtain an active ingredient B of 3,5,7,3',4'-pentahydroxy-flavone and an active ingredient C of 3,5,7,4'-tetrahydroxy-flavone after coarsely separating the ethyl acetate part extractum by virtue of a column chromatography on silica gel. The active ingredients separated by the method are low in loss, high in separation speed, high in purity, stable and easy to apply.
Owner:北京利科德科技有限公司

Anti-biological blocking device for drip irrigation system

The invention relates to an anti-biological clogging device for a drip-irrigation system. The drip-irrigation system is started, an air intake brake valve is opened, an ozone generator is started, and compressed water which comes from the head part of the drip-irrigation system is sprayed at high speed from a jet orifice of a jet nozzle so as to form the negative pressure in a gas injection cavity; and under the action of the negative pressure, the ozone generator ensures that ozone generated through air ionization enters the gas injection cavity through the air intake brake valve, a check valve and an air inlet pipe along with the air filtered by an air filter, and enters an oscillating cavity for vortex oscillation, stirring and aerification along with the high-speed water flow sprayed by the jet nozzle so as to form 'ozone water' of which gas and liquid are distributed uniformly, and the 'ozone water' enters the drip-irrigation system to kill microorganisms in flow channels and cansynchronously inhibit crop root systems from growing toward the direction of a water outlet of a drip irrigation emitter in an underground drip-irrigation system, so that the aim of biological clogging resistance of the drip-irrigation system is fulfilled. Compared with a method of injecting a chemical agent into irrigation water, the invention has the advantages that: the residue of harmful substances which can pollute the environment is not produced, and the risk of using dangerous chemical agents is avoided.
Owner:FARMLAND IRRIGATION RES INST CHINESE ACAD OF AGRI SCI

In-vitro culture method of chondrocytes

The invention discloses an in-vitro culture method of chondrocytes, which comprises the following steps: cutting off cartilage tissue pieces from the surface of a joint, and repeatedly cleaning in PBS(Phosphate Buffer Solution) added with double antibodies; putting the cleaned cartilage tissue into a culture medium, cutting the cartilage tissue into pieces, and fully washing the cut cartilage tissue with PBS containing double antibodies; collecting chopped cartilage tissues, centrifuging the tissues, adding a digestive solution, and digesting the tissues; centrifugally collecting cells, adding PBS to clean the cells, adding a culture solution into a cell cluster to prepare a cell suspension, counting the cells, and adjusting the cell density; inoculating the cell, adding a low-sugar DMEMculture medium of FBS, and culturing the cells in a saturated humidity incubator; and when the cells are fused and 80-90% of the bottom of the bottle is covered, carrying out subculture. According tothe invention, the defects and defects of low cell viability, small separation quantity and poor storability in the prior art are solved to the greatest extent, and the mammary epithelial cells cultured by the method have higher cell viability and more quantity and are easier to adhere to the wall compared with the cells obtained by the traditional laboratory method.
Owner:BEIJING YULONG SHENGSHI BIOTECH CO LTD
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