118 results about "Vibrio" patented technology

The invention discloses a fermentation method of recombinant bacillus subtilis for expressing vibrio parahaemolyticus outer membrane protein, which comprises the following steps: inoculating a recombinant bacillus subtilis strain into a liquid culture medium for activation and amplification to obtain a seed solution; transferring the seed solution into a fermentation tank according to the inoculum size of 5%-10%, controlling the temperature to be 35-37 DEG C and the pH to be 6.8-7.2, introducing sterile air and stirring, and monitoring the thallus concentration OD600 value in real time; when the OD600 value reaches 35-38, 10% of an inducer is added for pre-induction; when the OD600 value reaches 40-45, the remaining 90% of the inducer is added for main induction, and the real-time dissolved oxygen value is collected; when the real-time dissolved oxygen value is continuously higher than a first preset threshold value, the flow acceleration rate of the inducer is increased, the fermentation temperature is increased at the same time or step by step, and the increase amplitude of the dissolved oxygen value is in positive correlation with the flow acceleration rate and the temperature increase amplitude; when the OD600 value is stabilized in a preset interval, it is judged that fermentation is completed, and the recombinant bacillus subtilis thalli are obtained. The yield and quality of the vibrio parahaemolyticus outer membrane protein can be effectively improved.

The invention discloses vibrio parahaemolyticus deoxyribozyme screening and label-free biosensor development. The vibrio parahaemolyticus deoxyribozyme screening and label-free biosensor development comprises the following steps: (1) obtaining a vibrio parahaemolyticus deoxyribozyme sequence; (2) optimizing reaction conditions of the vibrio parahaemolyticus label-free biosensor; and (3) detecting the vibrio parahaemolyticus. The detection principle of the sensor is as follows: when vibrio parahaemolyticus exists, deoxyribozyme is triggered to be self-cleaved, a generated cleaved short chain can be used as a primer for starting rolling circle amplification (RCA), a large number of long-chain DNA products with repeated series G-quadruplex sequences are generated by amplifying a designed RCA annular template, G-quadruplex and ThT can form a G-quadruplex / ThT compound, and the long-chain DNA products can be used for detecting the vibrio parahaemolyticus. The fluorescence is generated under the excitation wavelength of 439 nm, and the higher the concentration of the vibrio parahaemolyticus is, the higher the fluorescence intensity of the system is, so that the simple, convenient, rapid, low-cost and high-sensitivity detection of the vibrio parahaemolyticus is realized.

The invention belongs to the technical field of biology, and particularly discloses a high-temperature-resistant antibacterial protein Cystatin B sourced from marine fish as well as a preparation method and application of the high-temperature-resistant antibacterial protein Cystatin B. The high-temperature-resistant antibacterial protein Cystatin B is derived from pomfret, and the amino acid sequence of the high-temperature-resistant antibacterial protein Cystatin B is as shown in SEQ ID NO. 1; the nucleotide sequence of the gene for coding the high-temperature-resistant antibacterial protein Cystatin B is as shown in SEQ ID NO.2, and the sequences of primers adopted for cloning the gene are as shown in SEQ ID NO.3-4. The high-temperature-resistant antibacterial protein Cystatin B has a remarkable antibacterial effect on gram-negative bacteria such as escherichia coli, vibrio parahaemolyticus and edwardsiella tarda as well as gram-positive bacteria such as staphylococcus aureus; and after being treated at the temperature of 100 DEG C, the antibacterial agent still can keep relatively high antibacterial activity. The antibacterial protein is simple in preparation method, can replace traditional antibiotics, and can quickly and efficiently prevent and treat various common bacterial diseases in aquaculture.

The invention relates to an extraction method and application of hippophae rhamnoides leaf polyphenol, and belongs to the technical field of food functional component extraction. According to the method, the hippophae rhamnoides leaf polyphenol is extracted by innovatively adopting a wall-breaking-step extraction system combining enzymatic pretreatment with ultrasonic induction, and the method is specifically characterized in that hippophae rhamnoides leaf powder is used as a substrate, and normal-temperature enzymolysis wall-breaking treatment is performed. Furthermore, a sound field is combined to promote non-thermal dissociation of secondary metabolites in the hippophae rhamnoides leaf powder, and a continuous process of'normal-temperature enzymolysis of cellulase-ultrasonic extraction 'is constructed. Then, adding an ethanol solution, and placing in a water bath for reaction extraction; and centrifugally freeze-drying to obtain the crude polyphenol of the sea buckthorn leaves. An antibacterial experiment shows that the hippophae rhamnoides leaf polyphenol crude extract has a remarkable antibacterial effect on food-borne pathogenic bacteria such as vibrio parahaemolyticus and aeromonas hydrophila, the technical scheme effectively keeps the biological activity of polyphenol, meanwhile, the solvent consumption and the oxidative degradation rate of heat-sensitive components are lower than those of a traditional process, and the method is suitable for development of natural preservatives and functional foods.

The present invention belongs to the field of traditional Chinese medicine technology and primarily relates to a traditional Chinese medicine composition, preparation method, and application for preventing and treating sea cucumber rotten skin syndrome. The traditional Chinese medicine composition comprises the following raw materials in parts by weight: 20-80 parts of Terminalia chebula, 3-20 parts of Galla chinensis, 10-50 parts of Andrographis paniculata, and 5-30 parts of Ligusticum chuanxiong. The traditional Chinese medicine composition can significantly enhance the immune function and disease resistance of sea cucumbers, reduce the inflammatory response and pathological damage caused by Vibrio splendens, slow the progression of sea cucumber disease caused by pathogenic bacteria, and reduce the morbidity and mortality of sea cucumbers suffering from rotten skin syndrome, thereby effectively preventing and treating sea cucumber rotten skin syndrome.

The invention discloses ultrasensitive detection of vibrio parahaemolyticus by a CRISPR (clustered regularly interspaced short palindromic repeats) electrochemical biosensor based on PCR (polymerase chain reaction) and a hairpin DNA (deoxyribonucleic acid) probe, which comprises the following steps: preparing a gold nanoelectrode, modifying the gold nanoelectrode by using the hairpin DNA probe, performing polymerase chain reaction amplification to obtain a PCR amplification product, adding the PCR amplification product into a CRISPR system, uniformly oscillating, and detecting the vibrio parahaemolyticus by using the CRISPR electrochemical biosensor. Placing in a 37 DEG C constant-temperature metal bath for pre-reaction for 10 minutes, and dropwise adding the obtained reaction system to the surface of the hairpin DNA probe modified gold nanoelectrode. The method disclosed by the invention is high in overall repeatability and stability, the modification density of the surface of the electrode can be reduced, the steric hindrance effect is further reduced, the trans-cutting efficiency is improved, and in actual detection, the method shows remarkable sensitivity, is high in specificity, short in time consumption, low in cost and simple and convenient to operate, and can be applied to field detection.

The invention provides a reagent for detecting the proportion of vibrio in prawn seeds or prawn culture water in total bacteria. The reagent comprises a vibrio detection primer and probe, a bacteria detection primer and probe, Taq DNA polymerase, a dNTP mixture, UNG enzyme, a freeze-drying protective additive and a PCR buffer solution. According to the method, the specific DNA of the vibrio and the bacteria in the sample is quantitatively detected by utilizing the fluorescent PCR technology, the proportion of the vibrio in the total bacteria is obtained through the obtained quantitative detection data, the proportion of the vibrio in the total bacteria in shrimp seeds and shrimp culture water can be obtained in a short time, and guidance is provided for shrimp breeding and culture.

The invention discloses saccharomyces boulardii, a culture and a preparation method and application of the saccharomyces boulardii. The preservation number of the strain is CCTCC (China Center for Type Culture Collection) NO: M 20252633. The preparation method comprises the following steps: preparing saccharified liquid by taking white spirit vinasse or brewer's grains as a main raw material and adopting a high-temperature alkali treatment and composite enzymolysis process, inoculating strains for liquid-state high-density fermentation, carrying out solid-liquid separation on fermentation liquor, taking a liquid phase, and carrying out spray drying. According to the method, high-value utilization of the waste vinasse is realized, and the production cost is remarkably reduced. The obtained culture is rich in viable bacteria and active small peptides, and has the characteristics of strong tolerance, wide antibacterial spectrum and the like. As a feed additive, the feed additive can effectively reduce the diarrhea rate of piglets, inhibit clostridium perfringens and prawn vibrios of broilers, and improve the oxidation resistance and production performance of animals.

The invention belongs to the technical field of gene engineering, and particularly relates to ALFPm3 modified antibacterial peptide, a molecular design and construction method and application of the ALFPm3 modified antibacterial peptide, and the amino acid sequence of the ALFPm3 modified antibacterial peptide is selected from any one of SEQ ID NO: 1-SEQ ID NO: 7. Analysis and design are carried out by combining the structure and action site of vibrio parahaemolyticus and the molecular structure and function relationship of the antibacterial peptide ALFPm3 as a basic template, the antibacterial activity of the antibacterial peptide ALFPm3 is improved, and other biological activities such as hemolysis are reduced.

The invention discloses a preparation method of a boiling antigen for vibrio parahaemolyticus serum agglutination. The preparation method comprises the following steps: selecting common serotype vibrio parahaemolyticus in monitoring for resuscitation; scraping a ring of placenta by using 10 mu L of an inoculating loop, dissolving the placenta in 1 mL of normal saline to prepare a bacterial suspension, and preparing 3 tubes of bacterial suspensions from each strain; boiling the bacterial suspension in boiling water for 1 hour, 45 minutes and 30 minutes respectively; and after boiling, centrifuging at 10000 rpm for 10 minutes, discarding the supernate, and reserving the precipitate as a boiling antigen for serum agglutination. The result shows that the agglutination accuracy after boiling for 1 hour is 100%, and the agglutination degree is 2 + or above; and no significant difference exists between 45 minutes of boiling and 1 hour of boiling, and no significant difference exists between 30 minutes of boiling. Compared with a high-pressure method, the method has the advantages that the operation time is shortened by 2-3 hours, special equipment certificates are not needed, and the method is suitable for daily detection and food poisoning traceability.

The invention provides a breeding method suitable for breeding litopenaeus vannamei in saline-alkali soil, and relates to the technical field of aquaculture. According to the breeding method suitable for breeding the litopenaeus vannamei in the saline-alkali soil, the proportion of Ca < 2 + > to Mg < 2 + > to K < + > in a water body is optimized to be 2.8: 1: 0.3 by customizing a compound ion regulation and control solution, SO4 < 2-> / Cl <-> is controlled to be 0.14-0.8, and the pH is stabilized to be 8.2-8.8 in combination with a citric acid-sodium citrate buffer system; a slow-medium-fast segmented domestication strategy is adopted to adapt to different development stages of the fries; ethanol clostridium protein (CAP) is added into the feed to be combined with compound probiotics, so that immune metabolism regulation and control are enhanced. Experiments prove that according to the method, the survival rate of the litopenaeus vannamei seedlings reaches 86.3% + / -2.1%, the culture period is shortened by 12-15 days, the hepatopancreas SOD activity is improved by 42.6%, the vibrio inhibition rate reaches 78.5%, and the method is remarkably superior to the prior art. The method does not need large-scale pond transformation, adapts to different types of saline-alkali soil water bodies, realizes efficient green culture, and has important application value.

The present application belongs to the field of microbial culture, and particularly relates to a culture medium for reducing expression of surface polysaccharide of Vibrio parahaemolyticus. The formula of the polysaccharide low-expression culture medium is selected from specific proportion of nutritional components and specific conditions for inhibiting polysaccharide expression, so that the expression amount of surface lipopolysaccharide and capsule polysaccharide of Vibrio parahaemolyticus after the culture medium is increased is lower than the expression amount of polysaccharide of Vibrio parahaemolyticus after normal culture, the expression of surface lipopolysaccharide and capsule polysaccharide can be inhibited to a certain extent, the surface of the bacterial body can better expose outer membrane protein, and the immunodetection of Vibrio parahaemolyticus is facilitated. The present application provides a technical basis for developing a complete immunodetection method of Vibrio parahaemolyticus.

The invention discloses a vibrio canetinii bacteriophage capable of being split across species and application, the bacteriophage is a vibrio canetinii bacteriophage CP2 which is preserved in the China Center for Type Culture Collection with the preservation number of CCTCCM20251108, and the vibrio canetinii bacteriophage CP2 is preserved in the China Center for Type Culture Collection. The vibrio cantoniensis bacteriophage CP2 is a virulent bacteriophage separated from the nature, is free of genetic modification, has high safety and strong application potential, has an optimal infection complex number of 1: 10000, has a fermentation titer of 3.5 * 10 < pfu > / mL after 12 h, can rapidly split vibrio cantoniensis, has a recognition rate of 96.7% to 180 vibrio cantoniensis strains and a splitting rate of over 96%, and can be used for preparing the vibrio cantoniensis bacteriophage CP2. The genome does not contain toxicity and bad genes, the biological safety is high, the bacteriophage is excellent in environmental adaptability, stable in activity when the pH value is 6-8, high in storage stability at 4-25 DEG C, capable of being stored for 12 months at 4 DEG C, capable of stably surviving at room temperature, tolerant to a common chemical agent povidone-iodine for aquatic products, and suitable for various breeding scenes. Meanwhile, the cracking spectrum is wide, and the cross-species capability is realized.

The application discloses a bocachito Nat10 antibacterial peptide, a coding sequence and use and a preparation method thereof, and relates to a method based on multiomics, a biological big data based on multiomics data of bocachito, screening and identifying an antibacterial peptide precursor gene sequence, and obtaining an amino acid sequence of the bocachito Nat10 antibacterial peptide through translation design, as shown in SEQ ID NO: 3. Through activity simulation prediction and in-vitro experiment verification, the bocachito Nat10 antibacterial peptide shows inhibitory effects on the growth activities of Streptococcus agalactiae, Salmonella enteritidis, Staphylococcus aureus, Vibrio anguillarum and Escherichia coli, especially on Staphylococcus aureus, and shows the best antibacterial effect at a concentration of 2.5 micromoles per liter. The bocachito Nat10 antibacterial peptide can be used for preparing various bactericidal preparations, including bacteriostatic agents, medicines or additives, and has good practical value and social ecological benefits.

The invention discloses a feed containing Bdellovibrio and a preparation method thereof. The invention introduces Bdellovibrio into feed to prepare feed containing Bdellovibrio. The presence of Bdellovibrio can significantly improve the physique of fish and enhance immunity. Meanwhile, puffed corn is used as a raw material, and fermented lactobacillus liquid is used to ferment the puffed corn to obtain a fermented culture. Meanwhile, the fermented culture, soybean peptide and spirulina powder are combined to prepare a feed containing Bdellovibrio that is rich in nutrition and good in palatability. Meanwhile, coconut oil is used as a wrapping material, thereby improving the water resistance and stability of the feed containing Bdellovibrio and making it easy to be digested and absorbed by fish.

The application discloses a colorimetric-SERS dual-mode detection and photothermal sterilization method for specifically detecting Vibrio parahaemolyticus and application thereof, and belongs to the technical field of food safety biology. The application takes Vibrio parahaemolyticus as a target, and prepares a multifunctional magnetic composite nanomaterial through layer-by-layer assembly. Firstly, the superparamagnetic separation performance of the magnetic composite nanomaterial is combined with magnetic chromatography to achieve the effect of rapidly separating bacteria from a complex food matrix. Secondly, the colorimetric and SERS sensing signals of the magnetic composite nanomaterial are used to quantitatively detect bacteria in a short time, high precision and high stability in a dual-mode. Finally, the photothermal performance of the magnetic composite nanomaterial is used to kill the detected bacteria by photothermal sterilization, so that the hazard control at the back end of detection is completed.

Provided is an engineered bacterium for inhibiting the synthesis of dodecanedioic acid. The expression of a related redox gene is knocked out or down-regulated in the genome of the engineered bacterium. The engineered bacterium can effectively reduce the production of the by-product dodecanedioic acid and prevent the peroxidation of 12-hydroxydodecanoic acid during the synthesis of nylon 12 monomer. Further provided is a method for constructing an engineered bacterium for inhibiting the synthesis of dodecanedioic acid. The method involves synthesizing nylon 12 monomer in Escherichia coli by using a quorum-sensing system in Vibrio fischeri. The established Escherichia coli containing a self-induction system can produce the nylon 12 monomer from glucose, and the generation of the by-product dodecanedioic acid can be effectively reduced. After fermentation in a shake flask for 72 h, the yield of the nylon 12 monomer is more than 100 mg / L, and the yield of the by-product dodecanedioic acid is reduced to less than 200 mg / L (the proportion in the product is less than 20%).

This invention relates to the field of aquatic compound feed technology, specifically to a special feed for mullet, silver carp, and golden carp cultured in saline-alkali land in Northwest China. The feed is characterized by being composed of the following raw materials by weight percentage: 10%–14% alfalfa meal, 16%–22% soybean meal, 16%–22% corn meal, 5%–7% molasses, 1%–3% yeast powder, 2%–5% lactic acid bacteria preparation, 2%–5% premixed feed for aquatic life in saline-alkali land in Northwest China, 1%–4% fish oil, and 1%–5% vegetable oil. This invention solves the problems of low survival rate, high feed conversion ratio, easy antagonistic inactivation of probiotics, fish oil oxidation, poor water resistance of pellets, and insufficient regional adaptability of traditional feeds. Compared with commercially available ordinary marine fish feeds, the survival rate of juvenile fish is increased by 15% to 30%, the feed conversion ratio is reduced by 10% to 20%, the Vibrio inhibition rate is ≥80%, the power consumption per ton of feed is reduced by 25% to 35%, and the raw material cost is reduced by 30% to 45%. It is suitable for large-scale aquaculture in saline-alkali land in Northwest China and has important value for improving the quality and efficiency of fisheries, ecological restoration, and rural revitalization.

The present invention relates to an application of a cyclic (L-leucine-D-proline) dipeptide and an aquatic antibacterial agent thereof, wherein the application is as an aquatic antibacterial agent. The application of a cyclic (L-leucine-D-proline) dipeptide of the present invention is specifically to uniformly mix it with aquaculture inputs in a certain ratio, and prepare it as an aquatic antibacterial agent; then put it into use at a certain frequency, that is, it can be achieved in the aquaculture process. Effectively inhibit the growth of Vibrio anguillarum and Staphylococcus aureus in the water body, effectively prevent and control aquatic organisms from being infected with Vibrio anguillarum and Staphylococcus aureus, and then effectively avoid the impact of Vibrio anguillarum on aquatic product output, and effectively avoid the increase in subsequent processing costs caused by the infection of aquatic raw materials with Staphylococcus aureus.

The invention belongs to the technical field of biology, and discloses a polypeptide derived from a deep sea ecological environment, an application of the polypeptide in preparation of an antibacterial preparation and an antibacterial drug. According to the application of the polypeptide disclosed by the invention in the preparation of the antibacterial preparation, the polypeptide comprises one or more of amino acid fragments with sequences shown as SEQ ID NO: 1-9, the compound has good bacteriostatic or bactericidal activity on one or more of escherichia coli, halomonas aeruginosa, acinetobacter picoteri, staphylococcus aureus, linear preristeria, klebsiella pneumoniae and vibrio parahaemolyticus, and has extremely low toxicity on mammalian cells under an effective concentration. The compound has excellent bacteriostatic activity, bacteriostatic broad-spectrum property and biocompatibility, and has very excellent application prospects in multiple fields such as food preservation, agricultural disease prevention and control, feed additives and the like.

The invention belongs to the technical field of aquaculture, and particularly relates to a greenhouse culture method for soft-shelled turtles, which comprises the following steps: step S1: carrying out steady-state water culture on culture water; and S2, setting the breeding temperature and humidity, and carrying out gradient fry throwing breeding. According to the method, the number of vibrios in the culture water body can be effectively reduced by performing steady-state culture on the culture water body, and then the mortality rate of the young turtles can be effectively reduced by performing gradient-temperature young turtle throwing culture on the turtles.

The invention belongs to the technical field of biology, and particularly relates to an antibacterial peptide sourced from symbiotic methane-oxidizing bacteria in deep sea and application of the antibacterial peptide. The amino acid sequence of the antibacterial peptide is shown as SEQ ID NO. 1. The antibacterial peptide provided by the invention is a novel antibacterial peptide, has broad-spectrum antibacterial activity on a variety of gram-negative bacteria and gram-positive bacteria pathogens, such as pseudomonas aeruginosa, listeria monocytogenes, enterococcus faecalis and various vibrios, and has the minimum inhibitory concentration of 8.13-16.25 [mu] M. In addition, the antibacterial peptide has relatively weak hemolytic activity and relatively low cytotoxicity. The antibacterial peptide provided by the invention can replace antibiotics, is applied to prevention and treatment of various bacterial diseases, and is used as a safe and stable food additive or cosmetic preservative candidate substance.

The invention discloses an application of a penaeus vannamei fatty acid binding protein (FABP) as an immunologic stimulant and an application of the FABP in preparation of drugs for enhancing the immune response capability of crustacean, and aims to enhance the vibrio parahaemolyticus infection resistance of the crustacean by improving the expression level of intracellular antibacterial peptides. Large-area death of crustacean caused by acute hepatopancreatic necrosis (AHPND) is avoided. The amino acid sequence number is E2IH93, the molecular weight is 15495 Dalton, no toxic or side effect exists, the synthesis cost is low, a new way is provided for treatment of crustacean bacterial infection, the ecological balance in the breeding process is not damaged, and the bacillus subtilis is an environment-friendly and efficient bacterial infection defense substance and has important application value.

The present invention discloses a rhodamine B-doped silica / xylan carbon dot composite material and a preparation method thereof. In the method, rhodamine B and tetraethyl silicate are uniformly mixed to form RhB@SiO2. The carbon dots are covalently linked to the RhB@SiO2 to obtain RhB@SiO2 / BCD. A short DNA double helix is ​​formed by grafting a complementary chain onto the surface of the BCD, and a single-stranded aptamer with a quencher attached to one end is coupled to the carbon dots. The single-stranded aptamer specifically targets Vibrio parahaemolyticus. When Vibrio parahaemolyticus is present in the test sample, Apt.D detaches from the BCD surface and binds to a recognition site on the surface of the Vibrio parahaemolyticus, restoring fluorescence. Using the red fluorescence intensity R emitted by RhB@SiO2 as an internal standard, quantitative detection of Vibrio parahaemolyticus is performed based on the ratio of the blue fluorescence intensity B of BCD to R.

According to the penaeus vannamei boone source bdellovibrio bacteriovorus and the application thereof, the screened bdellovibrio bacteriovorus has splitting property on pathogenic bacteria such as vibrio harveyi and edwardsiella and does not exist on penaeus vannamei boone, so that the culture benefit is improved. The preservation number of the bdellovibrio bacteriovorus provided by the invention is CCTCC (China Center For Type Culture Collection) NO: M20241363. The screened bdellovibrio Bde2 strain can widely split pathogenic bacteria of the penaeus vannamei, has a better antibacterial effect than a standard strain, does not have pathogenicity to the penaeus vannamei, can be used for a long time in the culture production of the penaeus vannamei, and particularly can be used for preventing microbial diseases of the penaeus vannamei in high-temperature seasons.

The invention relates to a primer probe group, a multiplex fluorescent quantitative PCR method and a kit for simultaneously detecting six pathogenic bacteria, and belongs to the technical field of molecular biology, the primer probe group comprises primer sequences and probe sequences shown in SEQ ID No.1-18 in a table 1; the 5'end of each probe sequence is modified with a reporter group, and the 3 'end of each probe sequence is modified with a quenching group; the reporter group is Cy5, FAM and VIC, and the quenching group is Eclipse. The invention provides a method for simultaneously detecting six pathogenic bacteria including vibrio parahaemolyticus, salmonella, staphylococcus aureus, escherichia coli O157: H7, listeria monocytogenes and shigella in the same reaction system by combining a multiple real-time fluorescent quantitative PCR (Polymerase Chain Reaction) technology. The multiplex real-time fluorescent quantitative PCR kit provided by the invention is used for detecting the six pathogenic bacteria, can improve the detection sensitivity and specificity, greatly improves the detection efficiency, and overcomes the defects of complex steps, long detection period and incapability of adapting to large-scale rapid detection in the conventional detection method.

The invention provides application of an antibacterial peptide targeting a vibrio parahaemolyticus outer membrane protein LptD, and belongs to the technical field of antibacterial peptides. The amino acid sequence of the antibacterial peptide targeting the vibrio parahaemolyticus outer membrane protein LptD provided by the invention is as shown in SEQ ID NO. 1. The antibacterial peptide provided by the invention can specifically inhibit vibrio parahaemolyticus, and the integrity of an outer membrane is destroyed by combining a beta-taco structural domain of LptD protein, so that cellular contents are leaked. In a ready-to-eat salmon model, the load of artificially inoculated vibrio parahaemolyticus can be reduced by 1.51 log CFU / mL by soaking 64 micrograms / mL of the antibacterial peptide disclosed by the invention for 4 hours, and meanwhile, the regeneration of a biofilm in a storage period is remarkably inhibited. Safety experiments prove that the antibacterial peptide provided by the invention has the advantage of high safety.

Provided herein are compositions comprising in vivo succinate-producting microorganisms, e.g., Bacteroides and Prevotella species (preferably Bacteroides thetaiotaomicron (e.g., VPI 5482), Bacteroides vulgatus (e.g., NCTC 11154, Prevotella copri (e.g., DSM 18205)), Parabacteroides (e.g., Parabacteroides distasonis), and Bacilli (e.g. Lactobacillus animalis), and methods of use thereof in treating or reducing risk of developing an intestinal infection, optionally an infection with Campylobacter, Salmonella, E. coli, Shigella, Listeria monocytogenes, Vibrio, Enteropathogenic E. coli, Klebsiella, or Clostridioides difficile, or promoting expansion of colonic tuft cells, in a subject.

The present invention discloses a primer-probe combination, a kit and an application for the constant temperature rapid detection of Vibrio coralliiformis. The primers are shown in SEQ ID NO.1 and SEQ ID NO.2, and the fluorescent probe is 5'-GATGCAACGCGAAGAACCTTACC TACTCT(FAM-dT)GAC(THF)(BHQ1-dT)CCTCAGAAGAGACT-3'. The primer-probe combination of the present invention is used to perform real-time fluorescent recombinase polymerase amplification on the sample to be tested, and the test results can be obtained within 20 minutes at 39°C. The detection equipment is small and easy to carry, providing a more convenient detection means for on-site and resource-scarce places. In addition, the detection sensitivity of the kit of the present invention is 10 times that of qPCR, and the reaction speed is faster than qPCR.

The present invention belongs to the field of biotechnology and provides a strain of Enterococcus faecalis with a preservation number of CGMCC No. 29087, which is characterized in that the Enterococcus faecalis can secrete bacteriocins that inhibit Vibrio parahaemolyticus, Staphylococcus aureus and Escherichia coli. The present invention also provides the application of the Enterococcus faecalis and the same in aquatic fermented feed and laying hen premix, which can effectively improve the utilization rate of feed and the growth and production performance of animals.