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Effects of Culture Method and Growth Phase on Free Lipid Composition of Yersinia pseudotuberculosis

机译:培养方法和生长期对假结核耶尔森氏菌游离脂质组成的影响

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The influence of culture method (free-floating cells in liquid nutrient broth or bacteria attached to agar surface on solid agarized medium of the same formulation) and bacterial age on the composition of free lipids in Yersinia pseudoluber- culosis (O:Ib serovar, strain KS 3058) grown in the cold (5degC) has been investigated. The specific growth rate of the bacteria on solid medium was about threefold less than that in liquid medium. The qualitative composition of phospholipids and fatty acids only slightly depended on the bacterial culture method. At the same time, the colonially growing cultures contained somewhat more total lipids, they synthesized more phospholipids, in the linear growth phase they contained more Iysophos-phatides, and they had higher fatty acid unsaturation index and higher pathogenic potential than their "planktonic" coun-terparts grown in otherwise identical conditions. The bacterial growth phase influenced the amount of 3-hydroxytetrade-canoic acid and, indirectly, that of lipopolysaccharide. The dynamics of changes in the amount of this acid with bacterial age was opposite in the surface and broth cultures.
机译:培养方法(液体营养肉汤中游离的细胞或附着在相同配方的固体琼脂培养基上的琼脂表面附着的细菌)和细菌年龄对假单胞菌(O:Ib血清型,菌株)中游离脂质组成的影响已经研究了在寒冷(5℃)下生长的KS 3058)。固体培养基上细菌的比生长速率比液体培养基上的细菌低约三倍。磷脂和脂肪酸的定性组成仅略微取决于细菌培养方法。同时,在殖民地生长的培养物中含有更多的总脂质,它们合成了更多的磷脂,在线性生长期,它们含有更多的溶菌磷脂,并且与“浮游生物”相比,它们具有更高的脂肪酸不饱和指数和更高的致病潜力。 -在其他条件相同的条件下生长的部分。细菌的生长期影响了3-羟基四癸酸的含量,间接影响了脂多糖的含量。在表面和肉汤培养物中,这种酸的量随细菌年龄的变化动态是相反的。

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