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首页> 美国卫生研究院文献>Applied and Environmental Microbiology >Effects of Leachate from Crumb Rubber and Zinc in Green Roofs on the Survival Growth and Resistance Characteristics of Salmonella enterica subsp. enterica Serovar Typhimurium
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Effects of Leachate from Crumb Rubber and Zinc in Green Roofs on the Survival Growth and Resistance Characteristics of Salmonella enterica subsp. enterica Serovar Typhimurium

机译：绿屋面胶粒和锌中渗滤液对肠炎沙门氏菌亚种存活生长和抗性特性的影响。鼠伤寒沙门氏菌

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摘要

The use of green roofs is a growing practice worldwide, particularly in densely populated areas. In an attempt to find new methods for recycling crumb rubber, incorporation of crumb rubber into artificial medium for plant growth in green roofs and similar engineered environments has become an attractive option for the recycling of waste tires. Though this approach decreases waste in landfills, there are concerns about the leaching of zinc and other heavy metals, as well as nutrient and organic compounds, into the environment. The present study analyzed the impact of leachate from crumb rubber and zinc on the growth and viability of Salmonella enterica subsp. enterica serovar Typhimurium. Zinc was chosen for further studies since it has been previously implicated with other biological functions, including biofilm formation, motility, and possible cross-resistance to antimicrobial agents. The study showed that Salmonella can colonize crumb rubber and that crumb rubber extract may provide nutrients that are usable by this bacterium. Salmonella strains with reduced susceptibility (SRS) to zinc were obtained after subculturing in increasing concentrations of zinc. The SRS exhibited differences in gene expression of flux pump genes zntA and znuA compared to that of the parent when exposed to 20 mM added zinc. In biofilm formation studies, the SRS formed less biofilm but was more motile than the parental strain.
机译：在全世界，尤其是在人口稠密地区，使用绿色屋顶是一种越来越普遍的做法。为了找到回收废旧橡胶的新方法，将废旧橡胶掺入人工介质中以在绿色屋顶和类似工程环境中生长植物已成为回收废轮胎的有吸引力的选择。尽管这种方法减少了垃圾填埋场的浪费，但人们仍担心锌和其他重金属以及营养物质和有机化合物会渗入环境。本研究分析了来自面包屑橡胶和锌的浸出液对肠炎沙门氏菌亚种生长和生存力的影响。肠球菌鼠伤寒。选择锌进行进一步的研究是因为它以前与其他生物学功能有关，包括生物膜的形成，运动性以及对抗菌剂的可能的交叉耐药性。研究表明沙门氏菌可以使面包屑橡胶定居，并且面包屑橡胶提取物可以提供该细菌可利用的营养。在锌浓度增加的条件下进行亚培养后，获得了对锌敏感性降低的沙门氏菌菌株。当暴露于20 mM添加的锌中时，与亲本相比，SRS在通量泵基因zntA和znuA的基因表达中表现出差异。在生物膜形成研究中，SRS形成的生物膜较少，但运动性比亲本菌株高。

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