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Chilling invokes different morphologies in two Salmonella enteritidis PT4strains

机译:低温在两种肠炎沙门氏菌PT4菌株中引起不同的形态

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The reduction in chemical preservatives in food processing has resulted in more refrigerated (chilled) products. However, the effect of chilling on Salmonella enteritidis PT4 isolates has received relatively little attention. This study investigates the effect of chilling on two Salm. enteritidis PT4 isolates, denoted E and I. These isolates differ in their tolerance to heat, acidification, survival on surfaces, and behaviour in animal models. E routinely shows greater tolerance and pathogenicity than I. Chilling invokes profound cell elongation and heterogeneity in which corresponded to a 90% sublethal injury; neither such substantial cell elongation nor significant injury was seen in I. The ability to recover resistance to desoxycholate coincided with a reduction to normal cell size. Incomplete cell division and failure of the septum to form is a likely hypothesis for cell elongation although outer membrane changes could be responsible. Possible links are suggested between cell elongation of the heat- and acid-tolerant strain and pathogenicity.
机译:食品加工中化学防腐剂的减少导致了更多的冷藏(冷藏)产品。然而,冷藏对肠炎沙门氏菌PT4分离株的影响受到的关注相对较少。这项研究调查了冷冻对两种Salm的影响。肠炎PT4分离株,称为E和I。这些分离株对热,酸化,表面存活和动物模型行为的耐受性不同。 E通常比I具有更大的耐受性和致病性。低温会引起深远的细胞伸长和异质性,这相当于90%的亚致死性伤害。在I中既没有观察到这种实质性的细胞伸长,也没有明显的损伤。恢复对脱氧胆酸盐的抗性的能力与正常细胞大小的减少相吻合。尽管外膜改变可能是造成细胞伸长的原因,但细胞分裂不完全和隔膜无法形成是可能的。建议在耐热和耐酸菌株的细胞伸长与致病性之间可能存在联系。

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