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At present, the study on the interaction between artificial nanoparticles and microorganisms is mainly aimed at single species microorganisms, and mainly focuses on the biotoxicity of nanoparticles, while less attention is paid to the resistance of the widely present microbial aggregates in the environment, such as natural biofilms, to artificial nanoparticles.
Natural biofilm is a typical microbial aggregate widely found in wetland systems such as rice fields, ditches, ditches, ponds, shallow lakes, etc., which has a unique aggregation structure and complex community composition, and has some resistance and adaptability to various conventional pollutant stress, but it is not clear whether it will be resistant to nanoparticle toxicity.
study of the resistance of microbial aggregates to nanoparticles is helpful to understand the environmental behavior of nanoparticles, and is of great value to the exploration of biological measures that can effectively control the environmental hazards of artificial nanoparticles.
Yonghong, a researcher at the Nanjing Soil Research Institute of the Chinese Academy of Sciences, systematically studied the resistance of natural biofilms to the toxicity of iron oxide nanoparticles (IONPs) widely used in industry and life.
The results found that IONPs stress encourages natural biofilms to produce more extracellular polymers that contain more function groups to protect microbial cells, where soluble extracellular polymers can reunite nanoparticles and reduce their mobility in the environment, loose extracellular polymers can adsorption of large numbers of nanoparticles, tightly bound extracellular polymers make microbial cells more closely structured, and form a physical barrier to prevent nanoparticles from entering the cells.
despite the protection of extracellular polymers, some nanoparticles are still able to enter microbial cells and produce reactive oxygen that causes oxidative damage and structural damage to cells and affects their physiological activities.
Long periods of IONPs coercion can cause natural biofilms to produce more chemically sensitised substances, alter the interactions between microorganisms, and alter their community composition and microbial diversity to form new and stable microbiomes to maintain the stability of their carbon metabolism and pollutant removal functions.
nome particle exposure can cause damage and stress to the cellular structure and physiological activity of microbial aggregates, but microbial aggregates can enhance resistance to nanoparticle stress through changes in their aggregate structure and community composition, and maintain the stability of their physiological and ecological functions.
the findings were published in Environmental Science: Nano and Environmental Science and Technology.
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