The present invention relates to the Schizochytrium genus SR21 strain and a microorganism belonging to the same species as does said SR21 strain or having substantially the same fungological properties as does said SR21 strain, the said SR21 strain and microorganism having the ability to produce the (n-3) series of docosahexaenoic acid (DHA) and the (n-6) series of docosapentaenoic acid (DPA), and the invention also relates to a process for preparing the (n-3) series of DHA and the (n-6) series of DPA utilizing said microorganisms. The microorganisms according to the present invention are superior in their proliferation character and their propensity to produce fat, and have the ability to produce the (n-3) series of DHA and the (n-6) series of DPA very well. Accordingly, it is possible to effectively produce the (n-3) series of DHA and/or the (n-6) series of DPA, which are useful in the fields of foods and pharmaceuticals, using the microorganisms according to the present invention. In addition, the present invention provides a fat obtained by culturing the present microorganisms. Since the fat composition contains the (n-6) series of DPA in addition to the (n-3) series of DHA having various physiological activities, it is possible to stably and effectively supply the (n-6) series of DPA and/or the (n-3) series of DHA to subjects in need of these highly unsaturated fatty acids by adding the fat composition to various feedstuffs or foods.

La présente invention concerne le genre contrainte de Schizochytrium de SR21 et un micro-organisme appartenant aux mêmes espèces que ladite contrainte SR21 ou ayant sensiblement les mêmes propriétés fungological que ladite contrainte SR21, ladite contrainte SR21 et micro-organisme ayant la capacité de produire la série (n-3) d'acide docosahexaenoïque (DHA) et la série (n-6) d'acide docosapentaenoic (DPA), et l'invention se relie également à un procédé pour préparer la série (n-3) de DHA et les séries (n-6) de DPA utilisant lesdits micro-organismes. Les micro-organismes selon la présente invention sont supérieurs dans leur caractère de prolifération et leur propension de produire la graisse, et ont la capacité de produire la série (n-3) de DHA et les séries (n-6) de DPA très bien. En conséquence, il est possible de produire efficacement la série (n-3) de DHA et/ou les séries (n-6) de DPA, qui sont utiles dans les domaines des nourritures et des pharmaceutiques, en utilisant les micro-organismes selon la présente invention. En outre, la présente invention fournit une graisse obtenue en cultivant les micro-organismes actuels. Puisque la grosse composition contient la série (n-6) de DPA en plus de la série (n-3) de DHA ayant de diverses activités physiologiques, il est possible fournissent à stablement et efficacement la série (n-6) de DPA et/ou les séries (n-3) de DHA aux sujets nécessitant ces acides gras fortement insaturés en ajoutant la grosse composition à de divers aliments ou nourritures.

 
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