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乙醇適應(yīng)對(duì)鼠傷寒沙門(mén)氏菌及其菌膜耐致死脅迫的影響
發(fā)布時(shí)間:2019/11/4 15:55:32 瀏覽次數(shù):1244
乙醇適應(yīng)對(duì)鼠傷寒沙門(mén)氏菌及其菌膜耐致死脅迫的影響
Effects of Ethanol Adaptation on the Resistance to Lethal Stress of Salmonella typhimurium and Its Biofilm
DOI:
中文關(guān)鍵詞: 鼠傷寒沙門(mén)氏菌 菌膜 乙醇適應(yīng) 蘋(píng)果酸
英文關(guān)鍵詞: Salmoenlla typhimurium biofilm ethanol adaptation malic acid
本文主要研究鼠傷寒沙門(mén)氏菌在玻璃表面生物菌膜(BF)的生長(zhǎng)特性和乙醇作用方式對(duì)鼠傷寒沙門(mén)氏菌菌膜形成的影響以及乙醇適應(yīng)處理對(duì)浮游菌與菌膜耐致死脅迫的作用。采用結(jié)晶紫染色觀察鼠傷寒沙門(mén)氏菌菌膜的形成,用酶標(biāo)儀測(cè)量波長(zhǎng)570 nm處不同條件下生物菌膜的生物量,用平板菌落計(jì)數(shù)衡量乙醇適應(yīng)處理對(duì)浮游菌及菌膜耐致死脅迫的影響。結(jié)果表明,結(jié)晶紫染色可清晰觀察到鼠傷寒沙門(mén)氏菌在玻璃表面形成的生物菌膜,菌膜形成的緊密網(wǎng)狀結(jié)構(gòu)隨著時(shí)間的延長(zhǎng)而增強(qiáng)。乙醇作用方式對(duì)菌膜形成有顯著影響,加入不同含量的乙醇后培養(yǎng)48 h,乙醇對(duì)菌膜形成有顯著的抑制作用。預(yù)先培養(yǎng)菌24 h后加入5%的乙醇,能顯著促進(jìn)菌膜的生長(zhǎng)。菌膜形成過(guò)程中,當(dāng)營(yíng)養(yǎng)條件為1/10 TSB,5%乙醇適應(yīng)能增加菌體對(duì)蘋(píng)果酸的耐受性,增加浮游菌對(duì)12%的乙醇及5 mg/mL蘋(píng)果酸的耐受性。
The objectives of this study were to investigate the growth characteristics of Salmonella typhimurium biofilm(BF) on glass surface, effect of ethanol activity on the formation of S. typhimurium BF and effect of ethanol adaptation on the resistance of planktonic and BF to lethal stress. The morphology of S. typhimurium BF on the glass surface was observed by crystal violet staining, BF biomass by Thermo Scientific Microplate Reader at 570 nm and ethanol adaptation by plate colony count. Results showed that S. typhimurium BF formed on the glass surface could be directly observed by crystal violet staining, and reticular structure formed by S. typhimurium BF became denser with incubation time. Ethanol activity had significantly different effects on the formation of BF. Ethanol added at different level during 48 h incubation of S. typhimurium inhibited the formation of BF significantly, however, ethanol added after the incubation of S. typhimurium for 24 h at 5% level only promoted the growth of BF. Ethanol at level of 5% increased the tolerance of bacteria to malic acid in BF formation under the condition of 1/10 TSB. In addition, 5% ethanol adaptation increased planktonic resistance to 12% ethanol and 5 mg/mL malic acid.