387 results about "Shigella" patented technology

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 invention provides a Bacillus coagulans HEW-B379 with a probiotic effect. The above strain is named as HEW-B379, and the preservation number of the strain is CGMCC No.12553. The Bacillus coagulans HEW-B379 has a substantial probiotic property, and can effectively inhibit growth breeding of enteropathogenic Escherichia coli, Staphylococcus aureus, Salmonella typhi, salmonella, Shigella, Proteus species, Shewanella putrefaciens and Pseudomonas aeruginosa. The Bacillus coagulans HEW-B379 has strong stress resistance, can resist high temperature and simulated gastric juice and simulate bile salt environment, can keep the survival rate of 99-100%, and can effectively adjust microbial balance of animal intestinal tracts, inhibit growth of harmful microbes, promote nutrition absorption of animals, improve the conversion rate of a feed and improve the productivity of the animals.

The invention discloses preparation and application of Clostridium butyricum and a live Clostridium butyricum preparation; Clostridium butyricum LXKJ-1 is collected in China Center for Type Culture Collection on 24 March, 2016 under CCTCC NO: M201613. A seed medium, fermentation medium formulation, culture conditions for Clostridium butyricum and a production of a preparation of live Clostridium butyricum are also disclosed. The Clostridium butyricum provided herein is tolerant to acids, bases and high temperature, is highly capable of producing butyric acid, can inhibit animal pathogens, such as Escherichia coli, Salmonella, Shigella, Staphylococcus aureus, Listeria monocytogenes, and Clostridium perfringens, and can prevent diarrhea in livestock and poultry due to Escherichia coli, Salmonella and Clostridium perfringens, improving intestinal flora balance, promoting the growth of livestock and poultry, relieving constipation in sows, improving egg weight for layers, improving eggshell quality for layers, and decreasing egg-feed ratio.

A process for isolating microorganisms from samples, particularly Shigella spp. from food samples, and a system, apparatus and composition therefor are provided. Magnetic particles are used to capture microorganisms and a system having separate magnetically-based apparatuses for collecting, concentrating and retrieving is used to isolate the magnetic particles having bound microorganisms. The apparatus for concentrating magnetic particles utilizes a small magnet assisted by vibration to concentrate collected particles at a localized region on the bottom of a container. The process, system and apparatus of the present invention are simple and inexpensive providing improved magnetic particle recovery adaptable to large scales.

The present invention belongs to the field of microbe detecting technology. The oligonucleotide probe for detecting common intestinal tract pathogenic bacteria is designed on 16S rRNA and 23S rRNA of bacteria, ipaH of dysentery bacillus giant plasmid, VipR of Salmonella typhi and other gene sequence, has length of 25-50 bp, and relatively high sensitivity and specificity. The oligonucleotide probe is suitable for detection based on nucleic acid hybridization principle, especially detection based on gene chip principle. Under certain use condition, it can detect Listeria, parahemolutic vibrio, Campylobacter, etc. It may be used in many aspects, such as disease diagnosis, environment detection, food poisoning detection, etc.

The invention relates to a quick, sensitive and high-throughput intestines source pathogenic bacterium detection method. The detection method provided by the invention integrates two powerful molecular biological techniques: polymerase chain reaction PCR and a micro-array, and directly fixes a probe of PCR hybridization in a hybridization cabin of the micro-array on a same chip with a PCR reaction chamber. The detection method comprises the following steps of enriching bacteria; extracting a DNA solution; carrying out PCR amplification; hybridizing; cleaning; and judging the result. The method provided by the invention can quickly detect genes of vibrio parahaemolyticus, Shigella, staphylococcus aureus, listeria monocytogenes and salmonella in high throughput, and the detection efficiency of front-line inspection and quarantine personnel of import and export ports can be greatly improved, thereby not only reducing the workload, but also solving the undetected positive result problem probably caused by conventional detection method to the maximum extent. Therefore, food safety incidents are prevented to the maximum extent.

The present invention provides a gene chip for detecting common pathogen in dairy, which comprises a solid-phase vector and an oligonucleotide probe fixed on the solid-phase vector, wherein the oligonucleotide probe includes DNA fragment or its complementary DNA or RNA sequence selected from E. sakazakii, streptococcus pyogenes, staphylococcus aureus, Klebsiella pneumoniae, Klebsiella oxytoca, Listeria monocytogenes, salmonella and 16S-23S rDNA intergenic spacer region of Bacillus cereus, as well as ipaH gene of Shigella or gyrB gene of citrobacter freundii. The invention further provides a reagent box which uses the gene chip to detect pathogen in dairy. The gene chip and the reagent box of the invention for detecting pathogen in dairy are easy to operate, highly precise and greatly repeatable.

The invention relates to a culture medium for simultaneous composite enrichment of five kinds of food-borne pathogenic bacteria, namely Salmonella, Escherichia coli, Staphylococcus aureus, Listeria monocytogenes and Shigella, and a preparation method for the culture medium. Food-borne pathogenic bacteria are a significant reason to cause food positioning, so the rapid and accurate detection of the food-borne pathogenic bacteria has an important practical significance for preventing and controlling food safety incidents. The culture medium is characterized by comprising the following components: 10.0 g of peptone, 10.0 g of sodium chloride, 9.0 g of disodium hydrogen phosphate, 1.5 g of monopotassium phosphate, 0.1 g of cholate, 0.1 mg of potassium tellurite, 1.0 g of lithium chloride, 3.0 g of glucose, 2.0 g of mannitol, 2.5 g of sodium pyruvate, 1.0 g of aesculin and 1,000 mL of distilled water, wherein the pH value is 7.1 to 7.5. The culture medium can simultaneously enrich five kinds of target pathogenic bacteria, can be used for separation and identification of target bacteria, can also be used for the molecular detection of multiple pathogenic bacteria on the same detection platform, provides technical support for a method for rapidly detecting five kinds of pathogenic bacteria in food, and meets the requirement of simultaneous detection of five kinds of food-borne pathogenic bacteria.

The invention discloses an intestinal flora maker for intestinal cancer and an application of the intestinal flora maker, and belongs to the technical fields of microorganisms and genetic engineering.The intestinal flora maker comprises megasphaera, veillenella, streptococci, bilophila sp., haemophilus, corynebacterium or Escherichia-Shigella. Through detection by the intestinal flora maker, risks of individuals suffering from intestinal cancer can be assessed, and auxiliary reference can be provided for disease diagnosis and prognosis monitoring.

The invention relates to assay methods for use in detecting specific materials such as core oligosaccharides derived from microorganisms, particularly pathogenic microorganisms, in a test sample. The invention further relates to compositions and methods for the rapid growth of such microorganisms enabling detection of same significantly earlier than is currently possible. In particular embodiments the invention is directed towards the rapid growth and/or detection of Salmonella, Shigella or Listeria.

The invention relates to a process for the research and development of a colon-bacillus composite and speedy chromogenic identification reagent. The process is characterized in that: 1. First, the quality control method is determined through activation identification and biochemical identification of coliform groups, salmonella, shigella and staphylococcus aureus; 2. Basic nutrients are selected according to the needs of target strains; 3. It is verified by the auxanogram method that proper nutrition environments, carbon sources, nitrogen sources, minerals, microelements, nutrilits, etc. are all necessary for the growth and breeding of microbes; without any one thereof, the microbes can not grow, metabolize and breed normally; 4. A visualization reagent, a masking reagent and a synergistic agent are selected; 5. Composite selection is conducted; 6. The feasibility of the composite selection formula is verified through tests, verifications and examinations on the indexes of a speedy chromogenic substrate, including the specificity test, the sensitivity test, the real sample inspection, the false negative and false positive strain identification, the stability test, the repeatability test, the competing strain and mixed bacterium interference test, the detection time and detection rate tests. 7. The most suitable formula is selected through a factor level orthogonal combination test.

The invention discloses a nucleic acid aptamer capable of specifically recognizing shigella, a screening method and application thereof. In the technical scheme, the single-stranded DNA oligonucleotide aptamer capable of specifically recognizing shigella is obtained through the SELEX (Systematic Evolution of Ligands by Exponential enrich-m ent) technology, and the aptamer can be converted to a report aptamer for detecting shigella through marking a marker such as fluorescein, so that the invention has wide application prospects of quick and accurate detection of shigella in food.

The invention relates to a gene chip and an application, which belongs to the biological detection field. The invention designs a set of detection probes by aiming at 11 types of common infectious diarrheal disease pathogen microorganism in clinic, and the gene chip containing the set of the probe. The detection probes comprises a vibrio parahaemolyticus probe, a vibrio vulnificus, a vibrio cholera probe, a vibrio alginolyticus probe, a vibrio furnissii probe, a shigella probe, an escherichia coli probe, an aeromonas probe, a salmonella probe, a campylobacteria probe, and a proteusbacillus vulgaris probe; the above mentioned probe sequence is shown as SEQ ID No: 1-117. The gene chip and probe can detect 11 types of common infectious diarrheal disease pathogen, the detection flux is high, the specialty is strong, the sensitivity is high, and the detection is rapid and effective.

The invention relates to genetic engineering of Scylla paramamosain, and provides a Scylla paramamosain anti-lipopolysaccharide factor, and a preparation method and application thereof. The preparation method comprises the following steps: building a recombinant expression vector for the Scylla paramamosain anti-lipopolysaccharide factor; introducing the recombinant expression vector into host cells, and carrying out induced expression on the host cells to obtain an expression product; and separating and purifying the expression product to obtain a recombinant protein, namely the Scylla paramamosain anti-lipopolysaccharide factor. The Scylla paramamosain anti-lipopolysaccharide factor has obvious growth inhibition and sterilization effects on Gram-negative bacteria such as Shigella flexneri, Vibrio alginolyiicus, Vibrio parahaemolyticus, Pseudomonas stutzeri and Pseudomonas fluorescens and Gram-positive bacteria such as Corynebacterium glutamicum, and has a potential application value in the preparation of antibacterial medicaments and antimicrobial additives for animal feed.

The invention provides a method for detecting fluorescent quantitative PCR of 12 pathogenic bacteria in real time at the same time, including the steps: collecting specific pathogenic gene or toxin gene of the target pathogen and using it as a target gene to design primers and probes so as to make the reaction conditions consistent; extracting a genome template of a sample to be detected; adding the template respectively into tubules equipped with different specific upstream and downstream primers and probes, and then adding the corresponding fluorescent quantitative PCR reagents; under the same cycle of fluorescent quantitative PCR, the corresponding primers and probes are used to detect the samples simultaneously, quickly and quantitatively in their respective reaction tubes. Easier, Quick and efficient, Twelve common pathogenic bacteria (Escherichia coli O157: H7, Listeria monocytogenes, Salmonella, Vibrio parahaemolyticus, Streptococcus betae, Yersinia enterocolitica, Streptococcusfaecalis, Shigella, Proteus mirabilis, Vibrio fluvialis, Campylobacter jejuni, Staphylococcus aureus) can be detected simultaneously in drinking water and food economically.

The invention provides a genetic chip and a detection kit related to major pathogenic microorganisms causing infectious diarrhea of human beings, which are mainly specific to 13 types of bacteria including lapactic bacillus coli/shigella, salmonella, comma bacillus, vibrio parahemolyticus, aeromona hydrophila, plesiomonas, virio hollisae, vibrio fluvialis, vibrio mimicus, Wauter's strains, vibriodamsela and vibrio furnissii. The genetic chip comprises a solid-phase carrier and an oligonucleotide probe fixed on the solid-phase carrier, wherein the oligonucleotide probe comprises DNA (Deoxyribonucleic Acid) fragments selected from genes including a gyrB gene, an ITS gene, a dnaJ gene, a toxR gene and the like with remarkable biological evolution advantages or complementary DNA fragments. By adopting the genetic chip and the detection kit provided by the invention, major pathogenic microorganisms causing infectious diarrhea of human beings can be detected. The genetic chip and the detection kit have the characteristics of easiness and convenience for operation, high flux, high accuracy, high repeatability and the like, and can be applied to clinical detection of inspection departments in hospitals.