32results about How to "Strong immune protection" patented technology

The invention provides a flounder streptococcus dolphin GAPDH tandem multi-epitope polypeptide and its application. The provided tandem multi-epitope polypeptide is four epitope peptides connected by polypeptide linkers; wherein the four epitope peptides are The amino acid sequences are respectively SEQ ID NO: 1‑4. A specific amino acid sequence of the provided tandem multi-epitope polypeptide is SEQ ID NO:8. Another aspect of the present invention also provides a Streptococcus iniae GAPDH multi-epitope vaccine, which is prepared by using the above-mentioned tandem multi-epitope polypeptide as an antigen and a vaccine adjuvant. The multi-epitope vaccine prepared by the invention can provide strong immune protection for flounder against S. iniae infection, and the effect is obviously higher than that of GAPDH recombinant protein subunit vaccine and S. iniae inactivated vaccine.

The invention relates to the technical field for extracting vitis linn polysaccharide from grapes or raisins, and provides a method of extracting and the applications of the vitis linn polysaccharide. The extraction steps are as follow: ethanol with the concentration of 95 percent whose weight is 4 to 9 times as of grape concentrated liquid is put into the grape concentrated liquid, and then the solution is stirred fully in room temperature and keeps standing for 4 to 12 hours to precipitate crud polysaccharide which is filtered by a piece of filter cloth with 300 meshes to 500 meshes to collect the crude polysaccharide. The invention can extract the vitis linn polysaccharide effectively with simple method, the vitis linn polysaccharide can be applied to prepare drug combinations for treating diseases caused by abnormal immune functions or for regulating abnormal immune functions caused by the disease. The vitis linn polysaccharide has uniform and strong protective immune function in vivo and vitro studies, and has a good application prospect as an immunopotentiator and an immunomodulator.

The invention provides chicken Eimeria tenella actin depolymerizing factor (ADF) recombinant bacillus calmette-guerin and a preparation method thereof. The preparation method comprises obtaining Eimeria tenella oocyst, extracting ribose nucleic acid (RNA), reversely transcribing the RNA into complementary deoxyribose nucleic acid (cDNA), designing primers according to an open reading frame of a cloned Eimeria tenella ADF gene sequence to perform polymerase chain reaction (PCR), enabling amplification products obtained by amplifying ADF genes to be connected with a PMD-18 vector to perform clone, performing enzyme digestion on a plasmid with correct sequencing identification, recycling a target fragment, enabling the plasmid to be respectively connected with an escherichia coli-mycobacterium shuttle expression vector PMV 261 and an integrated expression vector PMV 361 which use the same enzyme to perform enzyme reaction, and then obtaining the positive chicken Eimeria tenella recombinant bacillus calmette-guerin through resistance screening and PCR identification. The live vector vaccine is good in stability, easy to transport, store and produce, free of purification, capable of being directly used for immune protection tests, removing complex processes of post-processing of proteins and greatly reducing cost, and suitable for vast rural areas.

The invention discloses an infectious bursal disease virus strain A11 and application thereof, and belongs to the field of the microbial technology. Infectious bursal disease viruses are separated from infectious bursal disease vaccine immunity failure chicken flocks appearing in recent years, biological characteristic analysis is carried out on obtained virus isolate strains, and the infectious bursal disease virus strain A11 with good biological characteristics is screened out from the obtained virus isolate strains and is a currently-popular infectious bursal disease virus with super-strong virulence. The virulence of the virus is attenuated with a chicken embryo and cell continuous passage method to culture the low-virulence strain A11, the low-virulence strain A11 has super-strong reproductivity in cells, the virus yield in cells reaches up to 10<11> TCID50 / 0.1 ml, immune protection resisting infectious bursal disease viruses can be rapidly generated by immunizing chicks with the strain A11, immune protection can be achieved after 1 week, and the strain A11 has huge application value in developing new specific infectious bursal disease vaccines.

The invention provides a multi-epitope polypeptide of flounder Streptococcus dolphin PDHA1, which comprises four Streptococcus iniae PDHA1 protein epitope peptides connected by polypeptide linkers, and the amino acid sequences of the Streptococcus iniae PDHA1 protein epitope peptides are respectively is SEQ ID NO: 1-4. Another aspect of the present invention provides a Streptococcus iniae PDHA1 multi-epitope vaccine, wherein the antigen is the above-mentioned multi-epitope polypeptide. The PDHA1 multi-epitope vaccine prepared by the invention can provide strong immune protection for flounder against S. iniae infection, and the protection effect is obviously better than PDHA1 recombinant subunit vaccine and S. iniae whole bacteria inactivated vaccine.

The invention relates to ATT fusion protein which is formed by linking 9 amino acids at Candida albicans Als3T cell epitopes before an amino acid sequence of TRAP fusion protein of staphylococcus aureus through Linker. The amino acid sequence of the fusion protein is shown in SEQ ID No.2. The invention further relates to genes for encoding the ATT fusion protein as well as a preparation method and an application of the ATT fusion protein. A mouse is immunized with the ATT fusion protein, immunodetection and a toxicity attack test are performed, and results indicate that the ATT fusion protein can induce a body to generate a stronger immune response and to have a better staphylococcus aureus infection prevention function and is an ideal candidate vaccine antigen for preventing infection of staphylococcus aureus.