157 results about "Cell survival rate" patented technology

The invention relates to the field of biological medicine, and discloses a rhizoma polygonati-fructus lycii heterozygous exosome, a preparation method and application thereof and an antioxidant composition. The hybrid exosome comprises miRNA-156a (micro Ribonucleic Acid) and miRNA-396b (micro Ribonucleic Acid), and the expression quantity ratio of the miRNA-156a to the miRNA-396b is (1.2 to 1.8): 1; the heterozygous exosome is loaded with a polygonatum kingianum characteristic active component and a Chinese wolfberry fruit characteristic active component. The rhizoma polygonati-fructus lycii heterozygous exosome is good in biocompatibility and capable of remarkably improving the cell survival rate, and brand-new and efficient raw materials and technical supports are provided for development of anti-aging and anti-oxidation functional products.

The invention discloses an antibacterial peptide based on D-type amino acid and application of the antibacterial peptide, and the antibacterial peptide is characterized in that the amino acid sequence is w-r-r-w-r-r-w-w-r-k-r (dTrp-dArg-dArg-dTrp-dArg-dArg-dTrp-dTrp-dArg-dLys-dArg). The antibacterial peptide can be synthesized through an Fmoc solid-phase chemical method, the synthesis difficulty is low, and the in-vivo antibacterial activity is good. The antibacterial peptide especially has broad-spectrum killing activity on carbapenem-resistant pseudomonas aeruginosa, pseudomonas aeruginosa, klebsiella pneumoniae, escherichia coli, methicillin-resistant staphylococcus aureus and staphylococcus aureus, is low in hemolytic toxicity, can reach half or more of cell survival rate under medium and low concentration, almost has no toxic effect on cells, and can be used for preparing the antibacterial peptide with a broad-spectrum killing activity on carbapenem-resistant pseudomonas aeruginosa, klebsiella pneumoniae, escherichia coli, methicillin-resistant staphylococcus aureus and staphylococcus aureus. The stability is good, the operability is high, and the cost is low.

The invention relates to the technical field of microfluidics, in particular to a high-throughput and high-efficiency cell extrusion microfluidic system and a particle introduction method. And a closed-loop control system integrating real-time cell deformation sensing, dynamic parameter decision and physical extrusion and alternating electric field cooperative application is constructed. The chip is provided with an inlet shunting device, a micro-channel and a channel structure of a microelectrode. The method comprises the steps of real-time deformation image acquisition and analysis and dynamic extrusion parameter decision and cooperative application. The invention provides a high-flux and high-efficiency cell extrusion microfluidic system and a particle introduction method, and aims to solve the problems that the drug loading efficiency and the survival rate are difficult to consider due to heterogeneity in the existing cell extrusion technology and a physical extrusion and electroporation coordinated regulation strategy is lacked, so that personalized precise treatment of cells is realized, and the cell quality is improved. The drug loading efficiency, the cell survival rate and the high throughput are obviously improved.

The invention discloses an application of an antibacterial peptide and an application of the antibacterial peptide in preparation of antibacterial drugs for treating carbapenem-resistant pseudomonas aeruginosa, klebsiella pneumoniae (ATCC700603), escherichia coli (ATCC25922), staphylococcus aureus and methicillin-resistant staphylococcus aureus, the antibacterial peptide is characterized in that the sequence is w-r-r-w-k-r-w-w-r-r, and the sequence is shown in the description. All amino acids are D-type amino acids; the antibacterial peptide can be used as an antibacterial substance in wash supplies, food preservative additives, medical consumable antibacterial agents and cosmetics, can be synthesized through an Fmoc solid-phase chemical method, and is low in synthesis difficulty and good in in-vivo antibacterial activity. Particularly, the antibacterial peptide has broad-spectrum killing activity against carbapenem pseudomonas aeruginosa, klebsiella pneumoniae (ATCC700603), escherichia coli (ATCC25922), staphylococcus aureus and methicillin-resistant staphylococcus aureus, the cell survival rate of the antibacterial peptide within the range of medium and low concentration (2 mu g / mL-32 mu g / mL) reaches half or more, the toxicity is small, the toxicity is almost avoided, the operability is high, and the antibacterial peptide can be widely applied to the field of medical application. The cost is low.

The invention relates to a culture medium for high-density serum-free suspension culture of BHK-21 cells and application of the culture medium. The culture medium contains inorganic salt, amino acid, vitamins, energy substances, a buffer substance, an antioxidant, sterol, polyamine, an additive and an indicator, and the antioxidant comprises dihydrolipoic acid and S-acetyl-L-glutathione. According to the invention, the culture medium for serum-free suspension culture of the BHK-21 cells, which is clear in components and remarkable in culture effect, can be provided. The added dihydrolipoic acid and S-acetyl-L-glutathione are combined as antioxidants of the culture medium, so that the survival rate of BHK-21 cells cultured in the culture medium is improved while the oxidation resistance of the serum-free suspension culture medium is improved.

The invention discloses application of a 3D hypoxia mesenchymal stem cell derived exosome preparation in preparation of an immune cell proliferation inhibitor or a medicine for treating acute myocardial infarction, belongs to the technical field of biology, and solves the problems of low cell survival rate and immunological rejection in application of a cell treatment method in the prior art. The 3D hypoxia mesenchymal stem cell derived exosome is used as a medium for treating acute myocardial infarction, and the problem of immunological rejection can be solved.

The invention discloses a preparation method and application of cubilose peptide. The amino acid sequence of the cubilose peptide is KPAPPKPEPK. The cubilose peptide prepared by the invention has strong ultraviolet damage resistance, and can improve the cell survival rate, improve the antioxidant enzyme level in serum, scavenge free radicals and reduce the inflammatory factor level in skin tissues. When the cubilose peptide is used for developing anti-ultraviolet damage products, the efficacy of cubilose can be deeply excavated, and the quality and economic value of cubilose products are improved.

The application discloses a kind of live cell dynamic monitoring method, comprising the following steps: obtaining the cell scanning picture group that live cell grown in culture vessel is photographed under specified condition, and the picture is preprocessed;Cell scanning picture group after pre-processing is input into trained cell identification model, and output cell growth state chart group;Cell growth state chart group is input into trained survival rate calculation model, and the survival rate of cell in each cell growth state chart is output;The cell survival rate numerical value obtained is drawn into cell survival rate-time curve chart;The cell survival rate-time curve chart generated is combined with nonlinear regression statistical method, and the half inhibitory concentration value of the efficacy of specified parameter calculation is selected.The growth state of cell under specified condition is monitored, and the survival rate of cell and the half inhibitory concentration value of the efficacy are calculated based on these data;It can significantly improve the efficiency and accuracy in the field of drug research and development, drug screening, treatment scheme effect, etc.

The invention provides a method for improving the success rate of single cell culture under external stimulation, belongs to the field of cell culture, and can solve the problem that the contradiction between a Raman spectrum signal and the survival rate can be formed by improving laser energy in the existing single cell culture. The method comprises the following steps: preparing a working solution containing an allogenic material; pretreating an experimental strain by using a culture medium containing the allogenic material to obtain a cell suspension; introducing the cell suspension into chambers of a micro-fluidic chip, and adjusting the cell suspension until each chamber contains at most one cell; in the presence of the allogenic material, culturing the single cell; wherein the allogenic substance is selected from one or more of an antioxidant substance, an anti-radiation substance, an anti-apoptosis substance and a repair promoting substance. According to the method, the exogenous material is added into the culture medium, and the micro-fluidic chip with a plurality of chambers is adopted for single cell culture, so that the survival rate and the clone formation rate of the single cells after Raman sorting can be remarkably improved, meanwhile, the advantage of low background interference is kept, and the survival rate of the single cells is improved.

The invention belongs to the technical field of compound application, and particularly relates to coriaria lactone compounds, a preparation method thereof and application of the coriaria lactone compounds in oxidative stress resistance. The coriaria lactone compound can significantly inhibit oxidative stress damage of SH-SY5Y cells, and the cell survival rate of the coriaria lactone compound is increased to 79.6%. Meanwhile, the nematode anti-aging activity is achieved, generation of nematode lipofuscin is inhibited, and the highest inhibition rate is 45%. In an extreme oxidative stress experiment, the service life of the nematodes is prolonged, so that the coriaria lactone compound has an application prospect of treating and resisting aging diseases.

The application discloses application of mesenchymal stem cell spheroids in preparation of a preparation for treating osteoarthritis, and relates to the technical field of cell therapy and osteoarthritis treatment, and specifically comprises mesenchymal stem cell spheroids with an average diameter of 120-180 mu m and a solution containing 0.5%-10% human serum albumin. The cells are prepared into 120-180 mu m cell spheroids, and the solution containing specific concentration human serum albumin is used as a carrier, so that the cell survival rate is stabilized at more than 90%, and high-activity delivery is realized; the optimized size ensures smooth injection and long-term retention in the joint cavity, and overcomes the shortcoming that single cells are easily removed; after joint cavity injection, the preparation can synergistically promote bone reconstruction and cartilage repair, and produces clear curative effects such as bone mass increase of more than 30%, cartilage degeneration score reduction of more than 50%, and the like, which are quantifiable and verifiable, so that a stable, long-acting and curative drug preparation and application scheme are provided for osteoarthritis treatment.

CRISPR-Cas systems have been engineered for various purposes, such as genomic DNA cleavage, base editing, epigenome editing, and genomic imaging. Although significant developments have been made, there still remains a need for new and useful CRISPR-Cas systems as powerful precise genome targeting tools. The invention disclosed herein comprises CRISPR-Cas based compositions and methods for high integration efficiency and expression efficiency of transgenes together with high post-transfection cell viability in eukaryotic cells.

The invention relates to the technical field of biochemical engineering, and particularly discloses a polyester fiber membrane and a preparation method thereof. The polyester fiber membrane is prepared from a copolymer shown in the formula I through electrostatic spinning. The prepared polyester fiber membrane is uniform in fiber diameter, good in gas permeability and high in relative cell survival rate, and has wide application prospects in the field of biomedicine. I

The application relates to the technical field of new uses of medicines, and particularly discloses application of an N-phenylpiperazine derivative in preparation of a medicine for treating Parkinson's disease, wherein the N-phenylpiperazine derivative is HS. + The N-phenylpiperazine derivative HS provided by the application can significantly improve the survival rate of SH-SY5Y cells induced by MPP + , shows a dose-dependent neuroprotective effect, can effectively improve the motor dysfunction of a model animal, increase the open field movement distance, prolong the time of staying on a rotating rod, and provides a new selection for developing an anti-Parkinson's disease treatment medicine with a neuroprotective effect.

The invention discloses a bacteriostatic and anti-inflammatory polypeptide extract and application thereof in a Yao bath. The polypeptide extract is extracted from rhizomes of Coptis chinensis (Coptis chinensis Franch.), and is obtained through extraction with a phosphate buffer solution, ultrafiltration and gel chromatography purification, and the polypeptide is as shown in SEQ ID No: 1. Experiments show that the polypeptide extract has significant bacteriostatic activity on pathogenic bacteria such as escherichia coli, shows a dose-dependent anti-inflammatory effect in an RAW264.7 cell model, can effectively inhibit NO release, and has a cell survival rate of 92% or more and excellent biological safety. The polypeptide extract is applied to a Yao bath preparation, O / W type emulsion is prepared, 10 volunteers try on the Yao bath preparation, the improvement rate on mild skin inflammation symptoms (such as red and swollen and pruritus) reaches 87%, and anaphylactic reaction is avoided. The polypeptide extract is simple in preparation process and high in activity, and has a wide application prospect in the fields of cosmetics and medicines.

The invention belongs to the technical field of bioengineering, and particularly provides application of a JNK inhibitor in preparation of drugs for preventing and / or relieving and / or treating pulmonary tuberculosis aiming at the problem that whether the existing JNK inhibitor SP600125 can inhibit BNIP3-mediated mitochondrial autophagy and further exert the ROS bactericidal effect is unknown. And the JNK inhibitor is an SP600125 JNK inhibitor. The JNK inhibitor is used for inhibiting mitochondrial autophagy in the BCG infected macrophages. The JNK inhibitor reduces the up-regulation of BNIP3 and LC3B caused by BCG infection. It is found through the application that when the concentration of the JNK inhibitor reaches 15 umol / L, remarkable cytotoxicity begins to appear, and compared with a control group, the cell survival rate is remarkably decreased. The SP600125 can be used for inhibiting mitochondrial autophagy and down-regulating the expression of BNIP3 and LC3B. Inhibition of JNK expression can inhibit survival of Mtb in RAW264.7 macrophages, and a new thought and direction are provided for treatment of tuberculosis.

The invention relates to the technical field of cell culture, discloses an integral bubble-eliminating organ chip, and aims to solve the problems of cell necrosis and experiment failure caused by bubbles in a perfusion process of an existing organ chip. The chip comprises a sealing cover plate, a substrate, a bubble trapping mechanism and an attachment mechanism, bubbles in perfusate are efficiently eliminated through the bubble trapping mechanism, the attachment mechanism provides a stable attachment surface for cells, bidirectional circulation of the perfusate is achieved, and a guide-in opening and a guide-out opening do not need to be distinguished. The bubble elimination rate reaches 99.9%, the cell survival rate is improved to 95% or above, the repeatability of experimental data is improved by 80%, expensive peripherals are not needed, the use threshold of an organ chip platform is lowered, and the method is suitable for long-term and high-throughput cell culture and organ function simulation experiments.

The invention belongs to the technical field of biology, and discloses a serum-free culture medium and application thereof in obtaining nerve cells through embryo fibroblast transdifferentiation. The serum-free culture medium consists of a basic culture medium, a protein additive and cell culture auxiliary components, the protein additive consists of transferrin, a leukemia inhibition factor and a basic fibroblast growth factor; the final concentration of the transferrin is 5 ng / mL-30 ng / mL, the final concentration of the leukemia inhibition factor is 50 ng / mL-150 ng / mL, and the final concentration of the basic fibroblast growth factor is 10 ng / mL-25 ng / mL. The serum-free culture medium can promote the conversion speed of transdifferentiation of fibroblasts into nerve cells, can significantly improve the transdifferentiation efficiency, and can improve the cell survival rate of transdifferentiation of mouse embryo fibroblasts into nerve cells.

The invention discloses a fibroblast preparation and a preparation method and application thereof, and belongs to the technical field of biomedical engineering, and the fibroblast preparation is prepared by mixing and compounding fibroblasts, a carrier and an active substance solution. The preparation method comprises the following steps: S1, cell pretreatment; s2, preparing a cross-linked collagen fiber hydrogel; s3, preparing an active substance solution; and S4, preparing the fibroblast preparation. By pretreating fibroblasts, activating the anti-inflammatory phenotype of the fibroblasts, promoting the fibroblasts to secrete collagen, loading the cells through collagenous fiber hydrogel and adding active substances, the skin lesion is repaired, meanwhile, type II immune excessive activation is inhibited, and the clinical disease performance of eczema mice is remarkably improved. The problems of limited skin disease treatment and skin lesion repair effects caused by low cell survival rate, poor carrier biocompatibility and poor active substance synergism in the prior art are solved, and the preparation method has the potential of preparing drugs for treating skin diseases.

The invention relates to lactobacillus paracasei for inhibiting cytotoxicity of methylglyoxal, and belongs to the technical field of biology. The invention provides a lactobacillus paracasei L5 which can be used for remarkably inhibiting cytotoxicity induced by methylglyoxal (MGO) and improving the cell survival rate. The lactobacillus paracasei can improve MGO-induced cytotoxicity by improving the activity of antioxidant enzymes such as SOD, GXP-PX and CAT, enhancing the function of a glyoxalase detoxification system, reducing inflammatory response and oxidative stress level, inhibiting Caco-2 cell apoptosis, up-regulating expression of key genes in MAPK, AGE-RAGE and cell apoptosis signal channels and enriching lipid metabolism and energy metabolism pathways.

The invention discloses a polypeptide with antioxidant activity and application thereof, and belongs to the technical field of biological medicine and fine chemical engineering. The amino acid sequence of the polypeptide is selected from QY, YG, YYYY, QPYY or WHYHDYKY. HPLC and MS structure confirmation shows that the synthesized polypeptide is high in purity and accurate in structure. In-vitro chemical experiments prove that the polypeptide (especially WHYHDYKY) has extremely high ABTS and DPPH free radical scavenging capacity, and the activity of the polypeptide is superior to or equal to that of glutathione (GSH). Cell experiments show that part of polypeptides (such as QY, YG, YYYY and QPYY) can significantly improve the survival rate of HepG2 cells under an oxidative damage model, and have a significant cell protection function. The polypeptide can be applied to the fields of antioxidant drugs, functional food, cosmetics, industrial antioxidants and the like according to the characteristics of the polypeptide.

The present invention relates to a method for reducing WST-8 to formazan based on NAD(P)H for determining the susceptibility of certain bacterial isolates to infection by certain bacteriophages, thereby allowing direct observation of the results measured as cell death of the target bacteria. The reduction of tetrazolium salts to formazan by NAD(P)H is used to determine the metabolic activity of cells and as an indicator of cell viability; whereas WST-8 is used to qualitatively measure the bacteriophage killing activity of the target bacteria. The present invention thus belongs to the field of medical biology, in particular to in vitro laboratory test methods.

The invention discloses a lactobacillus plantarum freeze-drying protective agent, freeze-drying bacterial powder as well as a preparation method and application of the freeze-drying bacterial powder, and belongs to the technical field of microorganisms. The lactobacillus plantarum freeze-drying protective agent comprises the following raw materials: saccharides, milk powder and sodium salt. The mass ratio of the saccharides to the milk powder to the sodium salt is (4-6): (14-16): (4-6). The lactobacillus plantarum freeze-drying protective agent can relieve damage caused by ice crystals in the freeze-drying process of lactobacillus plantarum and maintain and stabilize protein and cell structures so as to effectively protect thalli, and the viable count and the cell survival rate of freeze-dried lactobacillus plantarum are improved.

The utility model relates to cell filtering technical field, propose a kind of cell filtering screening device, the design includes support seat, support seat top is provided with main component, and support seat and main component junction is provided with shaking screening subassembly;Cover assembled in support seat top;Shaking screening subassembly includes the first motor that can drive main component and connecting plate and shake in support seat top level;First motor is fixedly installed in support seat interior;Main component includes support platform;The first sleeve for storing cell liquid before and after screening and the second sleeve are respectively fixedly connected in the both sides of support platform top;Pipetting assembly is arranged in support platform top for moving cell liquid from the first sleeve to the second sleeve in moving;The design is filtered by dynamic shaking acceleration, motor drive automatic pipetting and double-stage filter cartridge precision grading, solves the pain point of traditional technology low efficiency, operation is complicated, while realizing "one-stop" automated sorting in the promotion cell survival rate.

The invention discloses a polypeptide with antioxidant activity and application thereof, and belongs to the technical field of biological medicine and fine chemical engineering. The amino acid sequence of the polypeptide is selected from QY, YG, YYYY, QPYY or WHYHDYKY. HPLC and MS structure confirmation shows that the synthesized polypeptide is high in purity and accurate in structure. In-vitro chemical experiments prove that the polypeptide (especially WHYHDYKY) has extremely high ABTS and DPPH free radical scavenging capacity, and the activity of the polypeptide is superior to or equal to that of glutathione (GSH). Cell experiments show that part of polypeptides (such as QY, YG, YYYY and QPYY) can significantly improve the survival rate of HepG2 cells under an oxidative damage model, and have a significant cell protection function. The polypeptide can be applied to the fields of antioxidant drugs, functional food, cosmetics, industrial antioxidants and the like according to the characteristics of the polypeptide.

The invention discloses an antiviral polypeptide and application thereof. The amino acid sequence of the polypeptide is shown as SEQ ID NO: 1 or 2. The invention discovers that the antiviral polypeptide shows remarkable broad-spectrum inhibitory activity on DNA (deoxyribonucleic acid) virus (HSV-1), RNA (ribonucleic acid) virus (H1N1) and enveloped virus (VSV), and the inhibition rates of the antiviral polypeptide on the DNA virus (HSV-1), the RNA virus (H1N1) and the enveloped virus (VSV) respectively reach 50.54%-75.18%, 73.06%-96.30% and 64.78%-98.68% under the concentration of 10 mu M. Meanwhile, the polypeptide has excellent safety, the half toxicity concentration in each cell line is higher than 50 mu M, and the cell survival rate under the effective antiviral concentration exceeds 90%. The invention effectively overcomes the technical defects of narrow spectrum, easy generation of drug resistance and insufficient safety of the existing antiviral drug, and provides an important candidate molecule for developing a new generation of antiviral drugs.

The present application relates to a kind of microcarrier and its application, the microcarrier has three-dimensional structure, the microcarrier has shell and inside is hollow or solid, the shell outer wall is uneven and has multiple concave points.This microcarrier improves the permeability of traditional microcarrier, is conducive to the material exchange between cell and external environment, improves cell survival rate, provides good mechanical protection for cell proliferation and constructs good three-dimensional structure for cell growth, realizes the friendly connection of cell, is conducive to the large-scale expansion of cell in limited space, and maintains the stability of cell physicochemical properties in long-term culture.

The disposable grinding injection device comprises a cylinder, the rear end of the cylinder is open, and the front end of the cylinder is sequentially provided with a Luer taper and a needle head; according to the double-layer plane grinding net, the mesh diameter of a first grinding net sheet is 1.0-1.5 mm, and the mesh diameter of a second grinding net sheet is 0.5-0.8 mm; the two layers of grinding meshes keep a vertical distance of 2-3mm, and mesh patterns of the two layers of grinding meshes are rotationally staggered at an angle of 30-45 degrees; the cylindrical push rod is hermetically and loosely matched with the inner cavity of the barrel body and is arranged in the barrel body and at the rear end of the double-layer plane grinding net; the push rod pushes the tissue to move towards the mesh when being pushed, negative pressure is generated when the push rod is pulled back, and liquid suction is achieved. Standardized control over the size of tissue particles is achieved; the operation time is shortened to 2-3 minutes; tissue exposure links are reduced, and pollution risks are reduced; a grinding mechanism based on shearing force is adopted, so that the cell survival rate is improved; grinding and injection are integrated, and an intermediate transfer link is eliminated.

The invention relates to a culture medium for serum-free suspension culture of F81 cells and application of the culture medium, the culture medium comprises the following components in concentration: 4000-4500 mg / L of amino acid, 80-120 mg / L of vitamin, 5000-5100 mg / L of inorganic salt, 5000-5500 mg / L of glucose, 1000-1030 mg / L of adherence promoting substance, 20-40 mg / L of growth factor, 2000-2040 mg / L of buffering agent and 2-2.4 mg / L of antioxidant, the pH value of the culture medium is 7.0-7.2, and the pH value of the culture medium is 0.5-1.5. The antioxidant is prepared from partially hydroxylated glutathione and a carboxymethyl chitosan-gallic acid grafted copolymer. The partially hydroxylated glutathione and the carboxymethyl chitosan-gallic acid graft copolymer are compounded to serve as an antioxidant of the culture medium, so that the oxidation resistance of the culture medium is enhanced synergistically, and the cell survival rate is increased.

The invention belongs to the technical field of nano materials, and relates to fullerol with moderate hydroxylation degree and a preparation method and application thereof. Fullerol with the chemical formula of C60 (OH) n.mH2O is obtained by controlling the mass ratio of fullerene to an alkaline reagent and adopting the processes of grinding, dissolving, concentration, alcohol precipitation and drying, n is 10-15, preferably 12, m is 10-15, preferably 12.5, and the product is a needle-like crystal and forms a stable dispersion liquid in water. Thermogravimetric analysis shows that the fullerol has controllable hydroxyl number and relatively high water solubility, has better ABTS < + > and. OH removal capability compared with low-hydroxylated and high-hydroxylated fullerol, can reduce the ROS level in cells and improve the cell survival rate and migration capability, can be used as an active component of an antioxidant and a cell repair preparation, and has a broad application prospect. The composition is used for skin barrier repair and oxidative stress related disease prevention and treatment.