51 results about "Microculture" patented technology

A multilayer microculture capable of modeling complex in vitro structures such as mammalian tissues and organ structures is provided, along with methods for producing such a microculture and methods of using such microcultures for assaying for modulators of cell-cell interaction, cell migration, cell proliferation, cell adhesion or cellular or organismal physiology. Further provided are methods of identifying hazardous materials such as environmental toxins and pollutants (e.g., carcinogenic compounds), and methods of monitoring organismal physiology.

The invention provides a method for detecting a biochemical oxygen demand. The method comprises the following steps of performing microculture on a microbe containing water sample from active sludge, surface water, domestic sewage or microbe containing industrial waste water, thus obtaining a microbial film; enabling a blank water sample and a target water sample to pass through the microbial film respectively, detecting and obtaining dissolved oxygen reduction current of the blank water sample and the target water sample, thus obtaining a dissolved oxygen reduction current difference value between the target water sample and the blank water sample; and obtaining the biochemical oxygen demand of the target water sample according to the dissolved oxygen reduction current difference value and a preset standard curve. According to the method, since the microbial film obtained by culturing the microbe containing water sample from active sludge, surface water, domestic sewage or microbe containing industrial waste water has high environment adaptation capacity, a buffer solution system is not required and the physiological activity can be maintained by taking one or more then one of running water, well water, dropping water and underground water as a medium.

The invention belongs to fermentation engineering of foods and drinks, and relates to a production process for fermenting tea by a microculture method, in particular to halimasch fermented tea and a production process thereof. The preparation method comprises the following steps of: preparing a culture medium; culturing first-stage seeds; performing amplification culture on second-stage seeds; inoculating and fermenting; and drying. The invention has the advantages that: halimasch is utilized to ferment tea, and the obtained fermented tea has double physiological effects, namely the pharmacological activity of tall gastrodia tuber and drinkability of tea, is easy to make and absorb, can fully integrate active ingredients of fermentation products, ensures that the resources of the fermentation products are fully utilized, and has good auxiliary and health-care effects in the aspect of improving human immunity.

The invention discloses two devices integrating sampling, reaction and detection. A first device comprises a liquid storage tube, a liquid distribution valve, a fixing sheet, a sampling swab rod and a reaction tube, wherein a breakable valve needle is arranged on the liquid allocation valve; the fixing sheet is connected with the sampling swab rod; the liquid allocation valve is arranged inside the inner cavity of the liquid storage tube; the storage cavity formed by the liquid storage tube and the liquid distribution valve is filled with a solution; the valve needle of the liquid allocation valve is positioned inside the storage cavity; the fixing sheet is arranged inside the liquid storage tube; a gap is formed between the fixing sheet and the liquid distribution valve; the gap is filled with chemical substances; the opening end of the liquid storage tube is sleeved by the reaction tube; a second device contains all elements of the first device, and further contains a damageable ampoule tube; the valve needle of the liquid allocation valve is positioned outside the storage cavity. The devices are sample in structure, multiple reagents can be placed in different zones and are mixed to use before reaction, and steps of sampling, treatment, reaction and detection on samples can be continuously completed. The devices can be widely applied to pathogen detection, microculture, enzyme activity analysis, immunochemistry detection and the like of clinical samples.

Highly porous, beads are comprised of a polymer and a second compound mixed into it. The second compound, an amendment, is either a nutrient or a compound having high affinity to one or more nutrients. A plurality of these beads may be exposed to an aqueous environment, usually a body of water. Bacteria and other microorganisms rapidly enter and remain within the nutrient filled interior space of the beads. Any of a number of various detection methods may then be used to characterize, detect and/or identify the microorganisms.

The invention belongs to the technical field of microculture, and discloses a streptomycete fermentation medium. The streptomycete fermentation medium is prepared from, by weight, 7.3-9.2% of straw zymolyte, 4.2-6.8% of potato diffusion juice, 3.3-5.5% of bean pulp hydrolysate, 2.6-4.7% of fishbone meal hydrolysate, 2.3-3.7% of wheat bran, 1.5-2.6% of glucose, 0.1-0.2% of dipotassium phosphate, 0.05-0.08% of magnesium sulfate, 0.02-0.03% of sodium chloride and the balance water. The streptomycete fermentation medium is low in cost and increases enterprise profits.

Described is a method for identifying a gene which mediates antibiotic sensitivity or resistance in a target bacterium, the method comprising the steps of: (a) generating a pool of mutant target bacteria by transposon mutagenesis with an activating transposon (TnA), wherein the TnA comprises an outward-facing promoter (TnAP) capable of increasing transcription of a gene at or near its insertion site in the DNA of said target cells; (b) generating a control microdroplet library by encapsulating individual members of the pool of step (a) in microdroplets, the microdroplets comprising a volume of aqueous growth media suspended in an immiscible carrier liquid, each microdroplet comprising a single mutant target cell; (c)generating a test microdroplet library by encapsulating individual members of the pool of step (a) in microdroplets, the microdroplets comprising a volume of aqueous growth media containing the antibiotic and suspended in an immiscible carrier liquid, each microdroplet comprising a single mutant target cell; (d) incubating the control and test microdroplet libraries to produce control and test microcultures; and (e) comparing the distribution of TnA insertions between control and test microcultures to identify a gene which mediates antibiotic sensitivity or resistance in said target bacterium.

The present invention provides a microfluidic device comprising at least one cell culture chamber, the or each chamber being connected to at least two openings, the device being configured to supply at least one physiologically active substance from at least one of the openings to the or each cell culture chamber in such a manner as to form a concentration gradient or concentration gradients in the or each chamber when cells and a hydrogel are introduced into the or each chamber to culture the cells in a 3D-gel medium.

The invention relates to the field of microculture, in particular to a protein culture medium for fast propagating biological bacteria. The protein culture medium is prepared from, by weight, 0.1-0.3part of growth factors, 20-25 parts of a coagulator, 18-28 parts of a protein additive, 0.5-1.5 parts of a PH modifier, 1.3-2.9 parts of microelements, 9-15 parts of saccharide and 30-40 parts of water. According to the culture medium, absorption of microorganisms to nutrient substances and conduction of related metabolic processes can be promoted, and stable growth and propagation of microorganisms can be stimulated. In addition, by adding vitamin, the protein additive and thelike, enough energy can be provided for the microorganisms to take, and fast propagation and metabolism of the microorganisms are promoted. Compared with a culture medium in the prior art, the culture medium is high in microorganism culture speed and microorganism propagating speed, balanced in nutrition and long innutrition holding time.

Describe is a method for screening mutant prokaryotic cells to identify producers of a cytotoxic agent active against a target cell, the method comprising the steps of: (a) providing cells of a producer prokaryotic species; (b) generating a pool of mutant producer cells by transposon mutagenesis of the cells of step (a) with an activating transposon (TnA), wherein the TnA comprises an outward-facing promoter (TnAP) capable of increasing transcription of a gene at or near its insertion site in the DNA of said producer cells; (c) co-encapsulating individual members of the pool of step (b) with one or more target cells in microdroplets, the microdroplets comprising a volume of aqueous growth media suspended in an immiscible carrier liquid, thereby generating a library of microdroplets each comprising a single mutant producer cell and one or more target cell(s); (d) incubating the microdroplet library of step (c) under conditions suitable for co-culture of the single mutant producer cell and target cell(s) to produce a library of microcultures, whereby mutant producer cells producing a cytotoxic agent active against the target cell(s) outgrow target cells in each microculture; and (e) screening the library of microcultures of step (d) for microcultures in which target cells have been outgrown or overgrown to extinction by mutant producer cells.

The invention relates to the technical field of microculture, in particular to a culture medium for culturing fat stem cells and a preparation method thereof. The culture medium comprises a basic culture medium and additives, and the additives include peptone, sodium chloride, glucose, lactose, phosphorus source, pig gall salt, mannitol, sodium pyruvate, amino acid, vitamin, antibiotic, metal salt, plant polysaccharide and distilled water. The culture medium contains the plant polysaccharide, thereby being capable of inhibiting growth of other cells except for fat stem cells and promoting proliferation of the fat stem cells and conducive to increasing concentration of the fat stem cells in the culture medium and shortening culture time; through synergism among ingredients, sufficient nutrition and good environment needed for cell growth and proliferation can be provided, cell growth can be promoted, albumin synthesis can be promoted, and cell activity can be maintained for a long time.

A portable refrigerated storage and transportation box is composed of a box body, a box cover, a box belt, a semiconductor refrigeration chip, magnets, a gas filling device and a power socket. A water tank made of a metal material is arranged in the middle of the box body. A gas guide pipe is arranged on the portion, on the rear portion of the left side of the water tank, of the box body. The gas filling device is mounted on an open hole which is provided with an inner thread and located on the portion, on the front portion of the left side of the water tank, of the box body. The semiconductor refrigeration chip is mounted on the portion, at the lower end of the water tank, of the box body. The power socket is mounted on an open hole in the rear end of the left side of the lower portion of the box body. The left side and the right side of the lower portion of the box body are each provided with an opening. The lower end of the rear portion of the box cover is mounted at the upper end of the rear portion of the box body through two hinges. One magnet is mounted at the lower end of the front portion of the box cover, the other magnet is mounted at the upper end of the front portion of the box body, and the box belt is mounted on the upper portions of the left side and the right side of the box body. By the adoption of the portable refrigerated storage and transportation box, the semiconductor refrigeration chip is powered and refrigerated through a storage battery in an automobile, the manner of butagas evaporation, heating and refrigeration is adopted, the low temperature is provided in the whole transportation process of cultures and microorganism samples, and the good protection function on the cultures and the microculture samples is achieved.

The invention provides a method of obtaining a population of antigen-specific T cells from peripheral blood of a host. An embodiment of the method of the invention comprises (i) dividing PBMCs from peripheral blood of a host into more than one sub-population; (ii) contacting the PBMCs with an antigen and IL-2; (iii) obtaining a sample of PBMCs from each sub-population; (iv) identifying an antigen-reactive sub-population by determining by high throughput quantitative PCR the expression of a factor produced by the PBMCs of each sample; (v) dividing the antigen-reactive sub-population into microcultures; (vi) identifying the antigen-reactive microculture; and (vii) expanding the microculture, thereby obtaining a population of T cells specific for the antigen. The invention also provides a population of T cells obtained by the inventive method, a pharmaceutical composition comprising the same, and a method of treating a disease in a host using the pharmaceutical composition. Related isolating and screening methods are further provided.

The invention belongs to the technical field of microculture, and provides a culture medium for endophytic fungi separation and rapid propagation of agilawood edgeworthia chrysantha, wherein the culture medium is prepared from potato, chenopodium quinoa, glucose, agar and distilled water. Meanwhile, the invention also provides a preparation method of the culture medium. The test result shows that the agilawood endophytic fungi quantity separated by the culture medium is obviously increased, and the agilawood endophytic fungi in fluid fungi shaking culture can reach the maximum growth within a short time, thereby greatly shortening the fungi shaking time. Moreover, all nutrition components of the culture medium are originated from the natural food materials (potato and chenopodium quinoa) and glucose; there is no any other additive; the culture of agilawood edgeworthia chrysantha fungi used as the edible treatment drugs is very important; the culture medium is green and environment-friendly, and the preparation is simple, economic and practicable.

The invention discloses a listeria monocytogenes selective medium, and belongs to the field of detection of microculture. The listeria monocytogenes selective medium is characterized in that the prepared 1000 ml culture medium comprises the following components: yeast extract powder, beef powder, casein peptone, agar, glucose, sodium chloride, zinc gluconate, sodium dihydrogen phosphate, optical, polymyxin,bacitracin, gamma-arginine hydroxy and sterile horse blood protein, and distilled water is added into the components to 1000 ml. Compared with the prior art, the selective medium has the characteristics of being reliable in detection result, and high in listeria monocytogenes separation rate.

The invention relates to the technical field of bio-pharmaceuticals and microculture, in particular to a CRM197 strain culture medium, a preparing method and a fermentation culture method. The CRM197strain culture medium is a liquid culture medium. Each L of culture medium comprises 250 mL of a basic nutrient solution, 7.2 mL of acetic acid, 30 g of maltulose monohydrate, 2 mL of sodium lactate,0.5 g of tyrosine, 1.96 g of monopotassium phosphate, 5.1 g of dipotassium phosphate, 6.13 mL of a growth factor a, 8 mL of a growth factor b, 8 mL of a growth factor c and 1.3 g of calcium chloride.All the components can be rapidly dissolved when the culture medium is prepared, and the uniformity of the culture medium is ensured. By means of the step-by-step amplification fermentation culture amplification mode, the CRM197 strain fermentation culture method has the advantages of being rapid, convenient to implement, low in cost and high in efficiency, the large-scale amplification of a CRM197 strain is facilitated, and therefore a high-expression-amount fermentation bacteria liquid is obtained.

The invention belongs to the technical field of microorganisms, and particularly relates to a microculture method. An incubator is adopted in the method and comprises a box, three culture tanks, a motor, ultraviolet lamps and culture liquid delivery pipes, the box is cylindrical, the culture tanks are positioned inside the box and used for culturing microorganisms, the motor is mounted at the bottom of the culture tank in the middle, the ultraviolet lamps are mounted on the inner wall of the box, and the culture liquid delivery pipes penetrate the box and are positioned inside the culture tanks and used for supplementing culture liquid for the culture tanks. The microculture method is mainly used for mass culture of microorganisms; the culture liquid delivery pipes are utilized to timely supplement the culture liquid in the culture tanks, and breeding and growing of the microorganisms are improved to greatest content. Power generated by stirring rods is utilized to provide proper temperature in the culture tanks.

The invention discloses a nocardia asteroid selective medium for sputum samples and belongs to the field of detection of microculture. The nocardia asteroid selective medium is characterized in that 1000 ml of culture medium comprises ox liver powder, malt extract powder, yeast extract powder, sodium chloride, agar, ferroporphyrin, calcium lactate, nalidixic acid, Incarvillea argute ketone, vitamin K1, casein phosphopeptides and sterile defiber sheep blood and the balance of distilled water. Compared with the prior art, the nocardia asteroid selective medium has the advantages of reliability in detection and high separation efficiency of nocardia asteroid.

The invention relates to a microculture appliance, in particular to an oscillation appliance for improving the dissolved oxygen level of a microculture process. The oscillation appliance comprises an opening portion 10 and an appliance body 20, the opening portion 10 is located above the appliance body 20, the opening portion is a hollow body A, the appliance body 20 is composed of an appliance body upper portion 21 and an appliance body lower portion 22, the appliance body upper portion 21 is a hollow body B with an included angle on the inner side, an opening is designed in a surface portion of the upper end of the appliance body upper portion 21, the opening is in sealed connection with the lower end of the opening portion 10, the appliance body lower portion 22 is a big-end-up inner hollow cavity with an included angle on the inner side, the bottom of the big-end-up inner hollow cavity is sealed by a sealing plane 221, and the hollow body B of the appliance body upper portion 21 is in sealed connection with the inner hollow cavity of the appliance body lower portion 22. The oscillation appliance for improving the dissolved oxygen level of the microculture process has the advantages that the application range is wide, the dissolved oxygen level of the microculture process can be improved, and thereby, microbial metabolism target product content and thallus wet weight can be increased.

The invention provides a microculture device capable of controlling illumination brightness and belongs to the technical field of microculture. The microorganism culture device comprises a culture tank, vibrating pins, a threaded rod and shading assemblies, wherein a handle is arranged at the top of the culture tank, the shading assemblies are connected to two sides of the culture tank, the bottomof the culture tank is supported by support legs, a drive mechanism is mounted between the support legs, the threaded rod is arranged in the culture tank and sleeved with a U-shaped clamp ring, the vibrating pins are connected with two sides of the U-shaped snap ring, and clamp plates are arranged below the vibrating pins. The temperature control force of the culture device can be kept, the solarenergy utilization rate of the culture device can be increased, and energy consumption of microorganisms in the culture process is greatly reduced.

The invention relates to the field of microculture and detection, and provides a microbiological detection device and a microbiological detection method, aiming at solving the problems of time consuming, high cost and poor biocompatibility and the like in the existing microbiological detection method. The microbiological detection device comprises a reaction chamber used for containing nutrient solution, a sensitive element and an organic thin-film field effect transistor, wherein the sensitive element is communicated with the reaction chamber, is contacted with the nutrient solution and is used for sensing pH value variation of the nutrient solution and producing an electric charge according to the pH value variation; and the organic thin-film field effect transistor is electrically communicated with the sensitive element and is used for determining whether microorganisms exist or not according to charge of the sensitive element, and kinds of the microorganisms are also determined. The organic thin-film field effect transistor is adopted as a detecting element, so that microorganism growth condition in the nutrient solution can be detected in real time according to variation of channel current of the transistor, a detection result can be rapidly obtained, and the microbiological detection method has the advantages that the cost is low and biocompatibility is good compared with the existing detection method.

The invention provides a method of obtaining a population of antigen-specific T cells comprising: (i) dividing PBMCs from peripheral blood of a host into more than one sub-population; (ii) contacting the PBMCs of each sub-population with an antigen; (iii) obtaining a sample of the contacted PBMCs from each sub-population; (iv) measuring the quantity of 1) IL-2 mRNA and 2) IFN-γ mRNA expressed by the PBMCs of each sample; (v) determining the IL-2 index of each sample; (vi) identifying one or more samples with an IL-2 index determined in (v) of greater than or equal to about 10 to identify one or more antigen-reactive, central memory T cell sub-populations; (vii) dividing the antigen-reactive, central memory T cell sub-population(s) identified in (vi) into microcultures; (viii) identifying one or more antigen-reactive microcultures; and (ix) expanding the microculture(s).

The invention provides a culture medium for culturing lysurus mokusin, and belongs to the field of the microculture. Research shows that the lysurus mokusin has good pesticide development prospect. According to a plurality of current lysurus mokusin culture mediums for culturing fungi, the growth of mycelium is slow, a form of the mycelium is sparse and distorted, and cannot satisfy the requirements of an experiment. The invention provides the culture medium for culturing lysurus mokusin mycelium. A preparation method for the culture medium comprises the following steps: collecting raw materials of silver birch branches in two years old, fallen leaves of dahurian larch, fallen leaves of silver birch and the like, after treatment of smashing, an ultrasonic wave and the like, preparing an agar culture medium, sub-packaging in a culture dish, and enabling the lysurus mokusin mycelium to be inoculated on the culture medium for culturing. The culture medium is capable of accelerating a growth rate of the lysurus mokusin mycelium, wherein time of overgrowing in 9 mm of the culture dish is shortened from 14 days of a common fungus culture medium to 9 days. The culture medium is also suitable for isolating a tissue of a lysurus mokusin sporophore and culturing ysurus mokusin spores.

The invention belongs to the field of the function and the application of genes and proteins, and relates to a new application of ATXN2L (Ataxin-2like) as a marker capable of assisting in evaluating gastric carcinoma oxaliplatin secondary drug resistance. Through a clinic specimen, a gastric carcinoma patient with high ATXN2L expression is proved to have bad prognosis. After the ATXN2L is silenced, the sensitivity of a gastric carcinoma cell for the oxaliplatin is enhanced. Through an in vitro induction method, an oxaliplatin drug-resistant strain is obtained, and an MTT (microculture tetrozolium) experiment proves that the oxaliplatin drug-resistant strain resists the oxaliplatin and a malignance degree is higher. Western blot detection finds that the expression of the ATXN2L in the oxaliplatin drug-resistant strain is higher than expression in a sensitive strain. In a flow type detection apoptosis experiment, after the ATXN2L is silenced, the sensitivity of the oxaliplatin drug-resistant strain for the oxaliplatin is increased. Therefore, the ATXN2L can be used as the marker capable of assisting in evaluating gastric carcinoma oxaliplatin secondary drug resistance, and therefore,an existing preparation technology for a kit can be used for providing a kit capable of assisting in evaluating gastric carcinoma oxaliplatin secondary drug resistance.