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Gas chromatographic method was applied to the study of the fatty acid composition (in Br. melitensis, Br. abortus, Br. suis, and Br. ovis strains. Fatty acid composition was similar in the mentioned brucellae species, except Br. suis No. 1330 significantly differing by this sign. Methyleneoctadecanoic acid content was considerably elevated, and that of octadecenoic -- reduced in brucellae grown on liver agar with the addition of serum and on meat-peptone agar in comparison with brucellae grown on liver agar; apparently this represents one of the mechanisms of the microorganism adaptation to the less favourable conditions of the nutrient medium. Passage of Br. ovis strain through the guinea pig organism led to the appearance of brucellae forming two types of colonies when grown on liver agar with the addition of serum. The fatty acid composition of brucellae forming small transparent colonies was the same as that of the initial culture with the prevalence of methyleneoctadecanoic acid; as to brucellae with larger colonies with irregular margin and nontransparent centre of the colony--octadecenoic acid prevailed in their fatty acid composition, i.e. their composition was similar to such in brucellae of the melitensis and abortus species grown on liver agar.
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