等离子体的大小决定了对粘土的吸附和在和的沙柱中突破
Jarad P Cochran1,2, Liyun Zhang1,3, Benjamin B Parrott1,4
1Savannah River Ecology Laboratory, Aiken, SC, United States.
Heliyon
|May 6, 2024
概括
细胞外DNA (eDNA) 在与粘土结合时在土壤中持续存在,有助于抗生素耐药性基因的传播. 等离子体大小显著影响DNA吸附和突破,影响微生物群落中的基因转移.
科学领域:
- 环境微生物学 环境微生物学
- 土壤科学 土壤科学
- 分子生物学分子生物学
背景情况:
- 水平基因转移 (HGT) 推动了抗生素耐药性基因 (ARG) 的传播.
- 转化,一个关键的HGT机制,依赖于细胞外DNA (eDNA) 的吸收.
- 土壤中的eDNA通常会降解,但当它被粘土颗粒吸附时,它可能会持续存在.
研究的目的:
- 研究eDNA在土壤环境中的持久性机制.
- 评估粘土矿物学,盐度和等离子体大小对DNA吸附的影响.
- 为了确定DNA大小如何影响其在土壤中的突破行为.
主要方法:
- 使用不同尺寸的三个等离子体 (pUC19,pBR322,pTYB21) 进行了批量吸附试验.
- 在纯粘土矿物质 (石,石,高石) 和散土土壤上测量了DNA吸附率.
- 分析了混合盐溶液和DNA大小对吸附和突破的影响.
主要成果:
- 吸附能力在吸附剂之间有所不同:戈伊 > 伊利 = 考林 > 散土.
- 低离子强度的溶液对DNA吸附趋势的影响最小.
- 等离子体DNA大小是吸附效率的一个重要因素,较大的等离子体吸附效率更高.
- 较大的等离子体表现出延迟突破,表明持久性较长.
结论:
- 对土壤矿物质,特别是粘土的eDNA吸附对于其持久性至关重要.
- 等离子体大小是eDNA在土壤中的持久性和流动性的关键决定因素.
- 了解这些因素对于预测和缓解抗生素耐药性基因通过HGT传播至关重要.
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