50 results about "Propidium iodide" patented technology

The invention discloses a method for measuring the size of the genome of a gesneriaceae plant. The method comprises the steps of taking fresh tender leaves of the gesneriaceae plant; with a tomato as a main internal reference and rice as a second internal reference, re-correcting the size of the genome of the rice by taking the size of the genome of the tomato as standard; according to the standard of adding 20 milligrams of tender leaves into 1ml of nuclear extraction buffering solution LB01, respectively adding the tender leaves of the target plant and the internal reference species into the nuclear extraction buffering solution LB01, chopping the tender leaves, performing filtration through a filtering net with the aperture of 50 microns to obtain a cell nucleus suspension, and putting the cell nucleus suspension on ice for later use; digesting RNA in the cell nucleus suspension through RNA digestive enzymes till the final concentration of the RNA digestive enzymes is 100 micrograms per ml, and then adding propidium iodide for fluorescence shading dyeing for 40 minutes; and measuring the size of the genome of the target plant through a flow cytometry. The method can measure the accurate sizes of the genomes of various gesneriaceae plants; the CV (Coefficient of Variation) is lower than 5 percent. The method is high in repetitiveness and easy to operate, and is suitable for gesneriaceae botanic research.

The invention relates to a dyeing liquor used to discriminate the protozoan cell activity, a method to discriminate the protozoan cell activity and the application of the method to discriminate activity of nosema bombycis, which is characterized in that: the dyeing liquor comprises the following components: three acridine oranges with the concentration of 0.05% to 0.3% and one propidium iodide with the concentration of 0.0067% to 0.026%; the acridine oranges and the propidium iodide are prepared by NaCl solution with the concentration of 0.38%; the method to discriminate the protozoan cell activity comprises adequate material choosing, dyeing liquor preparing, dyeing, microscopic examination and protozoan cell activity discriminating based on the color change of microscopic examination results. The dyeing liquor used to discriminate the protozoan cell activity has the advantages that: the spore activity of nosema bombycis can be discriminated quickly, sensitively, accurately and visually; the deficiency of the prior art is overcome.

The invention relates to a specific probe and a method thereof for rapid and sensitive quantification of staphylococcus aureus. On the basis of the sequence of a 16s-rRNA conservation terminal of the staphylococcus aureus, a specific complementary nucleic acid probe is designed, the probe is named as SA-1 and 5' terminal is labeled with fluorescein isothiocyanate FITC; and the sequence number of the SA-1 is shown as 5'-GCCGGTGGAGTAACCTTTTAGGAGC-3'. According to the invention, the specific complementary nucleic acid probe is designed on the basis of the sequence of the 16s-rRNA conservation terminal of the staphylococcus aureus and is named as SA-1, the 5' terminal is labeled with fluorescein isothiocyanate FITC, and the FIFC-labeled SA-1 can achieve specific combination with the processed staphylococcus aureus so as to excite fluorescent light from the staphylococcus aureus; and on the basis, propidium iodide PI is adopted for overall dyeing treatment on bacteria, sarcoid cells or intestinal contents, and fluorescence parameters are analyzed by virtue of a flow cytometry by taking a fluorescent microsphere with known concentration as internal reference, so that the purpose of quantifying bacteria is achieved.

The invention relates to the technical field of displaying and discloses a preparation method of an aligned film. The preparation method includes: coating a substrate with PI (propidium iodide) liquid covering a valid area and an invalid area of the substrate, and solidifying the PI liquid; removing the part, located in the invalid area of the substrate, of the solidified PI liquid to form a pattern of the aligned layer. According to the preparation method, distinguishing the invalid area and the valid area of the substrate is not required when the PI liquid is applied to the substrate; the invalid area of the substrate is controlled in such a manner that the part, located in the invalid area of the substrate, of the solidified PI liquid to form the pattern of the aligned layer; at this moment, the PI liquid is solidified and has no fluidity, and accordingly, the invalid area of the substrate is convenient to control when the preparation method is used in preparing the aligned layer.

The present invention discloses an activity detection method for fusarium virguliforme. According to the method, a propidium iodide staining method is adopted, a laser scanning confocal microscopy is adopted to detect, and the dead spores and the living spores of the fusarium virguliforme can be rapidly, accurately and sensitively distinguished. The method provided by the present invention can replace the traditional spore germination method, and is applicable for the departments of port inspection and quarantine, agricultural production, plant protection and the like.

The invention discloses a flow-cytometry-based kit for high-flux screening of ethanol-producing fungi and application thereof. The kit comprises a box body, reagents, a cell culture plate, a centrifuge tube and a copper screen. The reagents are as follows: 1000 mL of reagent A composed of 6.15g of citric acid and 17.544g of sodium citrate, reagent B composed of 0.3mg of propidium iodide (PI) and 0.3mg of DCFH-DA, 50 mL of reagent C composed of 2g of glucose, 50 mL of reagent D composed of 10g of glucose, 50 mL of reagent E (pH value is 5.5) composed of 0.5g of yeast powder, 0.5g of tryptone, 0.05g of ammonium monoacid phosphate and 0.025g of magnesium sulfate, and 50 mL of reagent F (pH value is 5.5) composed of 0.05g of yeast powder, 0.05g of tryptone, 0.05g of ammonium monoacid phosphate and 0.025g of magnesium sulfate.

The invention relates to a method used for detecting ostrea plicatula eosinophilic and basophilic granulocyte phagocytic ability, and the method comprises (1) ostrea plicatula blood cell suspension preparation; (2) fluorescent microsphere phagocytosis; (3) staining with neutral red; (4) lining dying with propidium iodide; and (5) microscopy. The method has the advantages of being simple in operation, rapid and accurate, strong in specificity, high in repeatability, and the like.

The invention relates to a detection method for radiosensitivity of a solid tumor cell. The detection method comprises the steps of taking detected tumor sample tissues, and preparing the detected tumor sample tissues into single-cell suspensions; taking lymphoma cells subjected to in vitro suspension cultivation as outer contrasts; respectively dividing detected tumor samples and the single-cell suspensions of the lymphoma cells taken as the outer contrasts into an illumination group and a blank control group, and carrying out single-pass illumination on the single-cell suspensions in the illumination group by adopting an X ray in a dosage of 5 Gy, wherein the single-cell suspensions in the blank control group are not subjected to radioactive ray illumination; carrying out cell disruption and rinsing on each group of the single-cell suspensions; carrying out electrophoresis on each group of the cells after disruption; carrying out PI (Propidium Iodide) dyeing on each group of the cells after electrophoresis; under a fluorescence microscope, respectively carrying out tumor/normal cell classification image capturing on the cells in the illumination group and the blank control group of the detected tumor samples, and carrying out image capturing on outer contrast cells; and carrying out data processing on images of the tumor cells, the normal cells and the outer contrast cells in the cells of the detected tumor samples, thus judging the radiosensitivity of the cells of the detected tumor samples.

The application discloses an optical alignment detection unit and an optical alignment method and device, wherein the optical alignment detection unit comprises a substrate; the substrate is providedwith an optical alignment indicative layer that is provided with an optical alignment PI (propidium iodide) liquid layer. The optical alignment detection unit and the optical alignment method and device have the advantages that the optical alignment indicative layer is provided, PI liquid generates macromolecular chains containing aniline groups after being exposed to ultraviolet, an indicator inthe optical alignment indicative layer is used for monitoring the amount of aniline groups, the aniline groups react with the indicator to generate a colored pigment after the aniline groups exist, and particularly, the optical alignment detection unit changes the color finally; color changes of glass coated with the indicator are judged at last to judge optical alignment process and uniformity; irradiating brightness and time of an ultraviolet lamp are controlled according to the color changes, so that uniform optical alignment is achieved and it is avoided that overexposure causes adverse effect on optical properties of products.

The invention relates to cytochemistry and cellular immunology, which are particularly used for observing a marine bivalve meiosis device through immunofluorescence microscopy. A sample can be observed after pre-treatment of fixing and the like, dyeing and flaking. The sample is fixed by phosphate buffered saline (PBS) of paraformaldehyde at a mass percentage concentration of 2 to 6 percent; then,permeabilization treatment and sealing treatment are performed sequentially; immunofluorescence dyeing is performed on sample spindle bodies, and fluorescence dyeing is performed on chromosomes withthe phosphate buffered saline containing propidium iodide of which the concentration is 5 to 20 mg of per liter; and the sample is flaked after dyeing for observation through fluorescence microscopy.The cytological immunofluorescence observation method is suitable for observing the spindle bodies and the chromosomes of the marine bivalve meiosis device synchronously, has the advantages of simpleand direct operation, high definition and high study efficiency, and is a qualitative, positioning and quantitative cytological immunofluorescence observation method which inosculates forms and functions.

The invention discloses a method for testing the toxicity of high algae-laden aquatic organisms. The method comprises the steps that saccharomyces cerevisiae is cultured in a solid medium containing 5% of YPD and 1.5% of agar firstly, after clone is grown out, a YPD fluid medium of 5% is inoculated with monoclone, and overnight shake cultivation is conducted based on 180-250 rpm and 25-58 DEG C; phosphate buffer is added to a culture solution with the OD value of 1.5-1.8 to obtain a blank sample A, a high algae-laden water sample is added to the culture solution with the OD value of 1.5-1.8 to obtain a detection sample B, and the two samples are placed on a mixer for oscillation lasting 2 h; cell washing is conducted on the sample A and the sample B twice by means of PBS, and cell suspension with the concentration of 1*105-1*106 cel ls/mL is prepared; the sample A and the sample B are both added to Annexin V-FITC of 5 mug/mL to be evenly mixed, and then propidium iodide of 5 mug/mL is added to be evenly mixed; reaction is conducted at the room temperature away from light for 5-15 min; flow cytometry detection is conducted within 1 h; the proportion of dead cells, the proportion of living cells and the proportion of apoptotic cells are detected by means of flow cytometry; the apoptosis rate and the death rate of the sample B are compared with those of the blank sample A, so that water toxicity is judged. Early warning technical support is provided for high algae-laden water pollution, so that high water supply quality is guaranteed.

The invention relates to a high-efficiency chromosomal mapping method for chlamys farreri genes. First, the preparation of chlamys farreri chromosome is carried out on a glass slide by the method of air-drying; then online primer design and primer synthesis are carried out according to the sequence of the gene to be mapped; the chromosomal mapping of rRNA gene is carried out; the glass slide supporting the chromosome is treated by utilizing a ligase; then formamide denaturalization treatment is carried out to the chromosome; LAMP reaction mixture is added and LAMP reaction in situ is carried out; after the reaction is finished, the glass slide is cleaned and added with a biotin antibody marked by fluorescence for incubation; finally, a propidium iodide anti-fading solution is used for redyeing the chromosome; a stable and clear hybridization signal is used for determining the position of a target gene on the chromosome. The method of the invention causes chlamys farreri gene to fast obtain a plurality of amplification products; the hybridization signal is clear and stable, thus promoting the correctness and specificity of chromosomal mapping. As for the mapping of a single-copy or low-copy gene, the method also has very great application potential.

Method for generating monoclonal antibodies that recognize progenitor cells. Said method comprises immunization of an Armenian hamster with neurospheres obtained from olfactory bulb cells from a 13.5-day mouse embryo and subsequent selection of the antibodies by means of neurosphere flow cytometry in the presence of propidium iodide. The antibodies thus obtained may be of use in the enrichment of cell cultures in progenitor cells, primarily neural progenitor cells.

The invention belongs to the field of biotechnology, and particularly relates to a research method of application of wedelolactone to preparation of lung cancer treating products. The invention researches influence of the wedelelactone on the activity, the cycles and the apoptosis of non-small cell lung cancer A549 cells as well as intervention to p-Caspase3, p53, p-STAT1 and STAT1 gene expressionof the cells, explores the anti-tumor effect of the wedelolactone on the A549 cells and the mechanism thereof, provides the research method of the application of the wedelolactone to the preparationof the lung cancer treating products, and provides a theoretical basis for future research on the non-small cell lung cancer treating mechanism of the traditional Chinese medicine. The research methodcomprise the following steps: performing cell culture, detecting the cell proliferation inhibiting rate by a CCK-8 method, detecting the cycles and the apoptosis of the cells through propidium iodideand Annexin-PI staining and detecting gene transcription and translation of the cells through RT-PCR and Western blot.

The invention discloses a method for observing the transferring of a fusion protein to a rice leafbud at long distance. The method comprises the following steps of: treating a root tip of rice by using a GFP (Green Fluorescent Protein) fusion protein; then, freezing a leafbud of a rice plant with a treated root tip, and slicing; next, dyeing by using a PI (Propidium Iodide) fluorescent dye; and directly observing the transferring condition of the GFP fusion protein from the root tip to the rice leafbud by using a confocal microscopy. By using the method, the position, 0.5cm away from the root tip, of the rice is treated by using the GFP fusion protein, the leafbud is frozen and sliced and then dyed, and the transferring condition of the GFP fusion protein from the root tip to the rice leafbud is observed by using the confocal microscopy, so that the long-distance transferring condition of the GFP fusion protein in the rice plant can be directly and qualitatively known about. The position, 0.5cm away from the root tip of the rice, is directly treated by using the GFP fusion protein, the transferring of the GFP fusion protein to the leafbud is observed by using the confocal microscopy, and thus, a very powerful evidence can be further provided for the fact that an effect protein can induce the defensive reaction of a rice system. The method is simple, convenient, accurate and rapid.

The invention discloses a method for separating saccharomyces cerevisiae haploids in an ultrahigh-throughput manner on the basis of flow cytometry, and belongs to the technical field of high-throughput screening. The method has the advantages that ascospore treatment conditions are optimized, and accordingly the optimal saccharomyces cerevisiae spore suspension preparation conditions can be obtained; active spores and inactive cells in spore suspension are stained by PI (propidium iodide) and FDA (fluorescein diacetate) stain, stained samples are analyzed on the basis of flow cytometers, accordingly, the activity of saccharomyces cerevisiae spores can be distinguished, and the spores can be absolutely counted; the optimal spore suspension preparation conditions are established, and technologies for separating the saccharomyces cerevisiae haploids in the ultrahigh-throughput manner on the basis of the flow cytometers are created.