74 results about "Microbe DNA" patented technology

A method for identifying microbial DNA/RNA comprising providing a sample containing microbial DNA/RNA; enriching DNA/RNA in the sample by a PCR method wherein the DNA/RNA that is identified comprise copies which are amplified by the PCR method; preliminarily classifying at least one microorganism by identifying the microbial DNA/RNA by a melting curve; adding at least one labeled oligonucleotide whereby temperature-dependent hybridization takes place and identifying the DNA/RNA on the basis of a physical property of the resultant DNA/RNA oligonucleotide complex, such as the temperature-dependence of the hybridization.

The invention relates to the field of molecular biology and discloses a kit and a method for extracting microbial DNA. The kit comprises lysis solution, inhibitor removal solution and binding solution, wherein the lysis solution comprises 50 to 200mM of Tris-HCl, 50 to 150mM of EDTA, 0.5 to 3M of NaCl, 0.5 to 2 percent of CTAB, 0.5 to 2 percent of PVP and 0.5 to 2 percent of SDS; the inhibitor removal solution comprises 100 to 300mM potassium acetate, sodium acetate or ammonium acetate and 50 to 200mM aluminum sulfate, ammonium sulfate or aluminum ammonium sulfate; and the binding solution comprises 3 to 6M guanidine hydrochloride, 10 to 50mM Tris-HCl and 5 to 50 percent isopropanol. The kit and the method for extracting the microbial DNA have the advantages of high purity, high universality, high extraction speed, direct use for a downstream experiment, and application to extracting DNA from a microbe-containing sample.

The invention relates to a pathogenic microorganism DNA detection chip and the chip comprises a carrier and a nucleic acid probe on the carrier. The nucleic acid probe is provided with a target detection probe used for detecting target gene of pathogenic microorganism. The pathogenic microorganism comprises but not limits to vibrio cholerae, pathogenic escherichia coli, campylobacter jejuni, Yersinia enterocolitica, parahemolytic vibrio, salmonella, and shigella and Listeria monocytogenes. The invention also relates to a preparation method of the pathogenic microorganism DNA detection chip and provides applications of the pathogenic microorganism DNA detection chip in detection of pathogenic microorganism. Also a pathogenic microorganism DNA detection chip kit is provided.

The present invention relates to molecular biology, microbiology, and medicine and provides the method for detection of Mycobacterium tuberculosis complex with simultaneous evaluation of sensitivity of the strains to rifampicin and isoniazid in clinical sample on differentiating biochip. The method is based on two-stage multiplex PCR to obtain fluorescent DNA fragments followed by hybridization of these fragments on microarray containing the set of specific discriminating oligonucleotides. The determination of the resistance of Mycobacterium tuberculosis to rifampicin and isoniazid is carried out by evaluation of point nucleotide substitutions in DNA of microorganism. The present invention allows conduct analysis directly in clinical sample, to evaluate a number of mutations simultaneously, to decrease the cost price of analysis, and to reduce the time of its conducting. The present invention also relates to set of primers, biochip, and set of oligonucleotide probes used in realization of the method.

The invention which belongs to the field of ship ballast water processing equipment especially relates to a method and an apparatus for processing ship ballast water through filtration, ultraviolet and ultrasound. The apparatus of the invention comprises a water pump, a pressure transducer, a flowmeter, a filter, a comprehensive processing unit of ultraviolet and ultrasound, a control system, an electromagnetic valve and a pipeline. Water enters the filter through the water pump, then enters the comprehensive processing unit of ultraviolet and ultrasound to be subjected to biological inactivation, and is finally discharged. The synergetic disinfection of the ultraviolet-ultrasound unit allows the disinfection effect to be good, ultrasonic waves destroy protective layers of microbes, the ultraviolet radiation destroys DNA and RNA of the microbes, and the ultrasonic waves have certain cleaning effects on ultraviolet lamps. The apparatus of the invention, which can effectively kill the microbes in the ship ballast water, has the advantages of low energy consumption, high reliability, simple operation and maintenance, realization of one-key operation through an automatic control unit, and flexible selection of an installation platform according to practical cases.

The invention relates to a simple extraction for the DNAs of microbes in a river environment sample. The method disclosed by the invention comprises: dividing the river environment sample into a water sample and a bottom sediment sample; and extracting the DNAs of the microbes in the water sample and bottom sediment sample respectively. The method can also be used for extracting any environment sample alone. In the invention, by combining a liquid nitrogen repeated freezing and thawing process, a sodium dodecyl sulfate (SDS) process, a lysozyme process and the like, the microbial cells in theenvironment sample can be fully lysed to fully release DNA; and analysis on bacterial diversity by polymerase chain reaction-denaturing gradient gel electrophoresis (PCR-DGGE) technique indicates theextraction method can effectively reflect the integrity and diversity of microbes in the river environment sample.

The invention discloses a method for determining microorganism varieties and pathogenic microorganism pollution conditions in air. The method for determining microorganism varieties in air comprises the following steps: 1) acquiring microorganisms in air to be detected by using a sampling filter membrane to obtain microorganisms in the air to be detected on the sampling filter membrane; 2) extracting DNAs (deoxyribonucleic acids) in the air to be detected on the sampling filter membrane to obtain unpurified microorganism DNAs; purifying the unpurified microorganism DNAs with magnetic beads to obtain microorganism DNAs in the air; and 3) sequencing the microorganism DNAs in the air, and determining the microorganism varieties in the air to be detected according to the sequences of the microorganism DNAs in the air. The experiment proves that the method for determining microorganism varieties in air can be used for determining the microorganism varieties in the air, and the method for determining pathogenic microorganism pollution conditions in air can be used for determining the existence of pathogenic microorganism pollution in the air.

The present invention relates generally to a method for detecting, enumerating and/or identifying microorganisms in a sample. More particularly, the present invention provides a method for determining total microbial content in a sample by detecting the presence of nucleotide sequences associated with all or part of 16S rDNA or its corresponding 16S rRNA or its homologue, functional equivalent or derivative. The nucleotide sequences of the present invention may be used as an indicator of any microorganism and, hence, represents a universal target sequence which is indicative of total microbial content in a sample. The universal target sequence may also be varied to render same genus or species specific or the universal target used to trap microbial DNA or RNA which may be subsequently analyzed by sequence analysis or genetic probe technology. The universal target sequence is useful inter alia to design as universal primers and probes to amplify any microbial-derived genomic sequence, as a means to detect and enumerate total microorganisms and to identify microorganisms in a sample at the genus or species level. Such uses enable improved methods of enviroprotection, bioremediation, medical diagnosis and industrial microbiology. The present invention further relates to the universal target sequence in isolated form and/or primers or probes capable of hybridizing to same and kits for the detection of total microbial content in a sample.

The invention relates to a microbial genome DNA (deoxyribonucleic acid) indirect extraction method for evaluating diversity of animal intestinal microflora. Before cell lysis, the method performs pretreatment on a sample and separates microbial cells from the excrement sample to avoid the problems that pollutants are difficult to remove and the DNA recovery rate is low in a purification step. According to the invention, phenol and chloroform are not used in the extraction process, thus harm to the physical health of experimenters is reduced. The OD260/OD230 and OD260/OD280 of the extracted intestinal microorganism DNA are approximate to standard values, and the intestinal microorganism DNA can be directly applied to molecular operation to evaluate the diversity of animal intestinal microflora.

The invention provides an extraction method of total DNA of metagenome of fish enteric microorganisms and a kit. The extraction method comprises the following steps: (1) fish sample sampling and fixing treatment of microorganisms on the surface of the fish; (2) acquisition of enteric microorganisms and collection of thalli; (3) embedding and cracking of cells; (4) extraction of DNA; and (5) DNA preservation. The kit comprises the following main components: a solution A which is a mixed solution of Tris and EDTA; a solution B which is a mixed solution of Tris, EDTA, NaCL, PVP, guanidinium isothiocyanate, Triton-X100, PMSF, and beta-mercaptoethanol; a solution C which is a mixed solution of Tris, EDTA, NaCl and DTT; a solution D which is a mixed solution of proteinaseK, a lysozyme, Tris, NaCl and SDS; a solution E which is a mixed solution of Tris saturated phenol and chloroform; F which is isopropanol; and G which is an ethanol aqueous solution. The DNA fragment obtained by the invention is high in purity, and the content of DNA of a host and the microorganisms on the surface of the fish is small.

The invention relates to a method for extracting prawn intestinal microbial DNA, and belongs to the fields of microbiology and molecular ecology. The method comprises the following steps of: grinding by using liquid nitrogen; breaking cell walls by using mechanical force; cracking cells by adopting lysozyme and SDS lysate; obtaining DNA deposit through separation and precipitation; and finally dissolving the DNA deposit with TE to obtain the DNA with good quality. The product DNA fragment obtained by the method is greater than 20Kb; and can be subjected to gene magnification and sequencing. The method has good generality and is used for extracting the intestinal microbial DNA of various crustacean aquatic animals. High-quality template DNA can be obtained through extraction at one time without repeated experiment; and the obtained DNA can be applied to the research of molecular ecology, system evolution and the like.

The invention belongs to the fields of soil microorganisms, biochemistry and molecular biology and relates to a method for separation and purification of a large-fragment DNA from soil. The method is used for indirect separation and purification of a large-fragment DNA having molecular weight more than 30kb from various types of soil, wherein the large-fragment DNA is used for construction of a metagenomic library, or is used for separation of soil microbial gene clusters. The method solves the problem that separation of microbial cells from soil and preparation of large-fragment soil DNA having high purity and satisfying various biological study demands are realized difficultly by the existing indirect method, and is an efficient method for extraction of soil microorganism DNA having a large fragment and high purity.

This invention relates to an extracting method of soil microorganism DNA. The stated method includes steps as following: cell disruption of soil microorganism, obtaining crude DNA solution, obtaining soil microorganism DNA; the stated method of this invention is using PVPP, protease K etc for valid combination. After organic solvent such as PEG20000, isopropyl alcohol and so on are precipitated, use spectrophotometer to determine value of OD260/OD230, OD260/OD280 close to standard value. It can be directly used for molecule operation, possessing great application perspective.

The invention discloses a DNA extracting method for evaluating the community diversity of the intestinal microorganisms of animals. Before cell disruption, a sample is pretreated, and DNA and pollutants outside the cells are removed, thereby avoiding the problems of difficult removal of the pollutants and low recovery rate of the DNA in a purification step. In the extracting process of the invention, phenol and chloroform are not used, and damage to the health of experiment personnel is reduced; and the obtained DNA is integral and has high yield, and the molecular fragment is larger than 10kb. The OD260/OD230 and OD260/OD280 of the DNA of the extracted intestinal microorganisms are close to standard values and can be directly applied to molecule operation to evaluate the community diversity of the intestinal microorganisms of animals.

The invention relates to a kit and method for extracting a microbial genome DNA by a magnetic bead method. The kit comprises a microbial preservation buffer solution, a bacteriolytic agent solution I, proteinase K, silica gel magnetic beads, isopropanol and an ethanol water solution, and further comprises a bacteriolytic agent II, a lysis adsorption solution and a reinforced scrubbing solution. The bacteriolytic agent II comprises MES, EDTA, Triton X-100, lysozyme and a lysozyme enhancer. The lysis adsorption solution comprises Tris-HCl, sodium chloride, EDTA, TrionX-100 and a nucleic acid separation and absorption promoter; and the reinforced scrubbing solution comprises Tris-HCl, lithium chloride and ethanol. By adopting the kit provided by the invention, cell walls of gram-positive bacteria and various fungi can be completely destroyed to form protoplasts, DNA of the protoplast cells can be rapidly released under the action of the lysis adsorption solution, the DNA is efficiently adsorbed on the silica gel magnetic beads, and after the DNA is washed by the scrubbing solution and eluted by an elution solution, microbial DNA with high concentration and purity can be obtained.

Disclosed is a method for identification of microbial pathogens in a body fluid sample comprising the following steps: a) providing a body fluid sample; b) lysing the microbial pathogens and performing a nucleic acid amplification reaction on the microbial DNA encoding 16S or 18S rRNA wherein or whereafter the amplified nucleic acids are labelled; c) contacting the labelled amplified nucleic acids of step b) with a microarray comprising on defined areas on the microarray's surface immobilised probes for microbial DNA encoding 16S or 18S rRNA from microbial pathogens; d) detecting the binding of one or more species of the labelled amplified nucleic acids to a probe by detecting a labelled amplified nucleic acid being specifically bound to the microarray; and e) identifying a microbial pathogen in the body fluid sample by correlating the detected binding of the labelled amplified nucleic acids with the defined areas of the immobilised probes for microbial DNA encoding 16S or 18S rRNA from microbial pathogens.

The invention discloses an efficient and economical soil microbial DNA extraction method. The method comprises the following steps: step 1, obtaining a microbial suspension; weighing 1 g of soil, adding 2 ml of suspension Buffer C1, 1 g of glass beads having the particle diameter of 0.09-0.12 mm, 500 muL of humic acid adsorbent Buffer C2 and 10 muL of proteinase K (10 mg/mL), mixing and shaking; step 2, obtaining microbial DNA; step 3, obtaining crude DNA; placing the material obtained in the last step in a water bath of 60 DEG C while stirring, then centrifuging at a high speed of 4 DEG C, and collecting the first supernatant; and step 4, obtaining purified DNA. The method is based on the requirements of soil-contaminated microbial detection, can extract DNA containing no inhibiting factor from complex environmental samples such as soil and feces, and is high in extraction speed and accurate in analysis result.

The invention belongs to the field of oxidation method, and especially provides an advanced oxidation method. The method comprises the steps that: (1) with a towing type reversed gas transmission wheel, air or oxygen is injected into water, such that stable dissolved oxygen is produced; (2) with ultraviolet rays generated by an ultraviolet lamp, the stable dissolved oxygen is converted into dissolved ozone that can not be released into air; (3) the dissolved ozone that cannot be released into air is subject to an effect of ultraviolet rays generated by the ultraviolet lamp, such that hydroxyl free radicals in water are produced; (4) the ozone free radicals in water and the hydroxyl free radicals in water act together, such that advanced oxidized purified water is obtained; (5) the advanced oxidized purified water is used for washing air, such that a purpose of air purification wetting is realized. According to the invention, dissolved ozone is directly produced by using dissolved oxygen in water, such that a safety property is good. Also, the ozone and hydroxyl free radical advanced oxidation method is combined with a capacity of the ultraviolet for directly damaging microbe DNA, such that a method for effectively killing microbes in water is further formed.

The invention provides a method for purifying microorganism DNA in forest soil, which comprises the following steps: (1) obtaining the rough DNA of a microorganism by a conventional method; (2) dissolving the rough DNA by extracted buffer solution; after the rough DNA is subjected to water bath and isovolumetric chloroform-isoamyl alcohol solution extraction, adding isopropanol which is 0.6 time of the volume of supernatant into the supernatant to precipitate DNA sediments; washing by 70 percent of pre-cooled alcohol and dissolving in the TE buffer solution; and (3) further purifying the initially purified DNA by a silica gel column. The method can remove most of impurities in a rough product of the extracted soil microorganism DNA and obtain the DNA with high purity and can be directly used for the conventional polymerase chain reaction (PCR) which is quite sensitive for an inhabiting matter. The invention has simple operation, low cost, less time consumption and wide application range and can be used for purifying the soil DNA in various types after other prior soil direct extraction methods.

The invention relates to a method for rapidly separating bacteria and a particular primer thereby, in particular to a method for rapidly separating anaerobic denitrifying bacteria and a particular primer thereby, solving the problems that the prior anaerobic denitrifying bacteria have long separation period and great workload and are difficult to obtain bacterial strains and pure bacterial strains with the destination functions. The method comprises the following steps: 1, extracting microorganism DNA from a sample for PCR augmentation and separation culture and prescreening the anaerobic denitrifying bacteria; 2, preparing particular culture media to be purified until a colony grows up; 3, carrying out the enrichment culture of the colony for the PCR augmentation and re-screening the anaerobic denitrifying bacteria; 4, repeating the separation culture, the purification culture and the enrichment culture, identifying and carrying out the PCR augmentation for removing repetitive bacterial strains and then, repeating the separation culture and the purification culture to obtain the pure bacterial strains. An upstream primer is SEQ ID of NO.1, and a downstream primer is SEQ ID NO.2.The invention shortens the separation period by 40 percent to 50 percent, has little workload and is easy to obtain destination bacterial strains and pure bacterial strains.

The invention provides a method for detecting rumen microorganisms of Holstein cows and belongs to methods for detecting rumen microorganisms of animals. According to the method, rumen fluid of the Holstein cows is extracted, DNA of microorganisms in the rumen fluid is extracted and types and relative quantity of microorganisms of the Holstein cows are determined through sequencing; the method comprises the following steps: (1), genome DNA extraction, (2) PCR amplification, (3) fluorescent quantitation, (4) high-throughput sequencing platform library construction, (5) high-throughput sequencing platform sequencing, (6) biological information analysis and (7) sequencing results. According to the method, the types and relative quantity of rumen microorganisms of the Holstein cows can be rapidly, comprehensively and efficiently detected, so that people can conveniently analyze types and quantity of rumen microorganisms of Holstein cows and study absorption digestion mechanisms for absorbing nourishment of rumen microorganisms. The method has the advantages as follows: detection time is shortened, the detection results are accurate and comprehensive, and types and relative quantity of all microorganisms in the Holstein cows can be accurately detected.