ARGの除去は限られているが,表面流動が構築された湿地では安定したレジストームの動態がある
Benjamin C Davis1, David Linz1, Brian R McMinn1
1Office of Research and Development, US Environmental Protection Agency, Cincinnati, OH, 45268, USA.
Journal of environmental management
|August 29, 2025
まとめ
設計による治療湿地は,抗生物質耐性遺伝子 (ARG) の除去が限られている. コアレジストームは安定したままで,ARGはネイティブであり,容易に転送されないことを示唆し,環境モニタリングの解釈に影響を与えました.
科学分野:
- 環境科学
- 微生物学
- 水質管理
背景:
- 排水と排水は 抗生物質耐性細菌 (ARB) と抗生物質耐性遺伝子 (ARG) を含む微生物汚染物質を導入し 水質を低下させます
- 建設された処理湿地 (CTW) は低コストの流域管理ソリューションですが,ARGに対する効果は評価する必要があります.
- CTWにおけるARGのダイナミクスを理解することは,微生物汚染の軽減におけるその役割を評価するために極めて重要です.
研究 の 目的:
- 建設された処理湿地のARGの除去効率とダイナミクスを調査する.
- コアレジストームを特徴付け,その安定性と湿地の生態系内の移転の可能性を評価する.
- 抵抗体構造,微生物群,糞便指標生物の相関性を評価する.
主な方法:
- ARGの量と組成を分析するために,Banklick Creek CTW (BCTW) から62個の水サンプルをショットガンシーケンシング.
- 水力停留時間の評価とレジストーム,微生物群,バイオマーカーのデータとの相関分析.
- クラス1インテグロンインテグラーゼ (intI1) 濃縮と遺伝子カセットの含有量の調査
主要な成果:
- リジストームの最小の全体的な衰弱が観察され,少量のARGは限られた除去を示した.
- 多剤流出系が支配するコアレジストームは安定しており,地域汚染を反映した.
- レジストームと微生物群の構造は高度に相関していたが,ARGは移動性遺伝子要素と限られた同時発生を示しており,これは低転移の可能性を示唆している.
結論:
- 水平面流の設計とBCTWの短い滞在時間は,ARGの除去効率を制限します.
- 安定したネイティブレジストームは,ARGが固有であり,この湿地システム内で容易に移転することができないことを示唆しています.
- 遺伝子カセットにARGを含まないintI1濃縮は,ARGの移動可能性を評価するためにintI1 qPCRアッセイを慎重に解釈する必要性を強調しています.
関連する概念動画
Conservation of Mass in Moving, Nondeforming Control Volume
1.4K
Stormwater detention basins are essential in managing runoff during heavy rainfall, particularly in urban areas where impervious surfaces increase the risk of flooding. Understanding the conservation of mass in these systems allows engineers to optimize basin performance, balancing inflow, outflow, and water storage.
In the context of a detention basin, the conservation of mass states that the total mass of water entering the basin must equal the mass leaving the basin plus any accumulation of...
In the context of a detention basin, the conservation of mass states that the total mass of water entering the basin must equal the mass leaving the basin plus any accumulation of...
1.4K
Laminar Flow
2.7K
Laminar flow represents a smooth, orderly fluid motion where particles move along parallel paths, resulting in minimal mixing between layers. Streamlined particle paths characterize this flow regime and occur under conditions where viscous forces dominate over inertial forces. The distinction between laminar, transitional, and turbulent flow is primarily determined by the Reynolds number, a dimensionless quantity calculated as:
2.7K
Rapidly Varying Flow
692
Rapidly varying flow (RVF) in open channels is characterized by abrupt changes in flow depth over a short distance, with the rate of depth change relative to distance often approaching unity. These flows are inherently complex due to their transient and multi-dimensional nature, making exact analysis difficult. However, approximate solutions using simplified models provide valuable insights into their behavior.Key Features of Rapidly Varying FlowRVF is commonly observed in scenarios involving...
692
Underflow Gates
536
Underflow gates are vital for controlling water flow in irrigation canals. The three main types of underflow gates — vertical, radial, and drum gates — serve different purposes while ensuring effective flow management. Vertical gates move up and down, generating a free-flowing water jet; radial gates pivot to regulate the flow; and drum gates rotate for precise adjustments. The flow through these gates is influenced by downstream conditions, resulting in free or drowned outflow.Free and...
536
Net Change Theorem
197
The Net Change Theorem is a fundamental principle in calculus that establishes a direct relationship between a function’s rate of change and its accumulated change over an interval. Mathematically, it states that the definite integral of a function's derivative over a given interval [a,b] yields the net change in the original function:This theorem has significant applications in various real-world scenarios, including physics, economics, and engineering. A particularly useful application is...
197
Freshwater Microbial Ecology
44
Freshwater systems such as streams, rivers, and lakes exhibit distinct physical and biological characteristics that influence their microbial communities. These environments are broadly categorized into lotic systems—those with flowing waters like streams and most rivers—and lentic systems, which include still or slow-moving waters such as lakes, ponds, and marshes.In lentic systems, phytoplankton drive primary production, generating autochthonous organic carbon. In contrast, lotic...
44


