摘要:
Disclosed are vaccine compositions for use in developing protective immunity against infection by Plasmodium parasites. Soluble proteinaceous immunogens are isolated from the fluid culture medium of in vitro propagated plasmodial species parasites (e.g., P.falciparum) in mammalian erythrocyte culture supernatant or from washes, including hypotonic washes, of cultured erythrocytes parasitized by plasmodium. Immunogens so obtained have molecular weights in the range from about 35,000 daltons to about 85,000 daltons. Two principal immunogens of the invention have molecular weights of about 42,000 and 54,000 daltons, respectively. The water soluble immunogens are administered in a suitable carrier such as isotonic salt solution and in combination with a suitable adjuvant such as saponin or, preferably, aluminum hydroxide. Upon administration to vertebrate animals susceptible to plasmodial infection, vaccines according to the invention provoke immune responses protective against morbidity and mortality caused by, e.g., P.falciparum infection. Disclosed also are procedures for optimization of large scale plasmodial parasite growth in human erythrocyte cultures with accompanying development of late erythrocytic stage parasites in large numbers and optimization of isolatable quantities of culture medium supernatant and wash-derived immunogens.
摘要:
A vaccine against a microbial pathogen comprised of a live, immunogenic but prototrophic and avirulent mutant strain of the selected microbial pathogen in an amount effective to confer immunity. A method of obtaining a vaccine that induces a heightened cellular and humoral immune response to one of a variety of microbial pathogens in a warm blooded animal. A method for isolation of an avirulent strain of a selected pathogenic microorganism.
摘要:
The present invention relates to an oil of microorganisms rich in docosahexaenoic acid (DHA, C22:6n3), comprising more than 60% of DHA relative to the total mass of fat and to the use thereof for human or animal feed, in particular for feeding infants, children, or pregnant or lactating women.
摘要:
Provided herein are eukaryotic microorganisms having a simple lipid profile comprising long chain fatty acids (LCFAs). Also provided are compositions and cultures comprising the eukaryotic microorganisms as well as methods of using the eukaryotic microorganisms.
摘要:
According to the invention, it has been found that when the amount of sulfate used in the culturing of PUFAs-producing cells is selected such that the sulfate concentration in the last phase of fermentation is always above zero, but at the same time always below the saturation limit of the cells, a biomass is obtained which has an increased proportion by mass of polyunsaturated fatty acids (PUFAs) in the final product, the process having at the same time a high product/substrate yield and space/time yield.
摘要:
An object of the present invention is to provide a microorganism that efficiently produces EPA and a method for producing EPA using the microorganism. The present invention relates to a microorganism having an ability to produce docosahexaenoic acid (DHA), wherein the microorganism contains a protein composed of an amino acid sequence in which at least one of the amino acid residues at positions 6, 65, 230, 231, and 275 in the amino acid sequence represented by SEQ ID NO: 2 has been substituted with another amino acid residue (mutated OrfB), and is capable of producing eicosapentaenoic acid (EPA), and the like.
摘要:
Disclosed herein is an avirulent live vaccine that involves a recombinant protozoan from the order Trypanosomatida having a knocked out or silenced cyclophilin gene, wherein the cyclophilin gene comprises T. cruzi cyclophilin 19 (TcCyp19) gene, or an orthologue thereof. Also disclosed is a method or inducing a protective immune response in a subject that involves administering to the subject a vaccine disclosed herein. Also disclosed is a method of treating or preventing Chagas disease, African trypanosomiasis, and/or leishmaniasis in a subject that involves administering to the subject a vaccine disclosed herein.
摘要:
Methods, devices and kits for the physical separation of plankton into its component parts utilizing phototactic behavior are described. The methods utilize positive phototactic behavior and negative contrast orientation of the zooplankton for maximal in situ separation of phytoplankton and zooplankton for use in further studies and evaluation of separation efficiency. The devices provide effective conditions for use in the separation of plankton into component parts.
摘要:
The invention pertains to a method to purify coccidial oocysts having dimensions between Dmin and Dmax from faeces comprising the steps of collecting the faeces containing the coccidial oocysts from host animals, diluting the faeces in an aqueous medium, separating a coarse fraction comprising macroscopic particulate matter from the diluted faeces and collecting an aqueous fraction containing the oocysts, characterised in that the method further comprises sieving the aqueous fraction over a first sieve deck having mesh openings to let the oocysts pass, to obtain an aqueous filtrate comprising the oocysts and a first residue comprising particles larger than the oocysts, and sieving the aqueous filtrate over a second sieve deck having mesh openings to obstruct passing of the oocysts through this sieve deck, to obtain a second residue comprising the purified oocysts and a waist filtrate comprising particles smaller than the oocysts. The invention also pertains to a system suitable for applying this method and to oocysts obtained therewith.
摘要:
The application is directed to in vitro-reared Plasmodium sporozoites of human host range wherein sporogony from gametocyte stage to sporozoite stage is external to mosquitoes, and methods of producing the same. Provided herein are in vitro-reared infectious Plasmodium sporozoites (SPZ) of human host range, particularly P. falciparum, P. vivax, P. ovale, P. malariae, and P. knowlesi, wherein sporogony from gametocyte stage to sporozoite stage is external to mosquitoes, and methods of producing the same.