Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 287, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apcatb.2021.119977
Keywords
Photocatalysis; Natural sphalerite; Antibiotic-resistant bacteria; Antibiotic-resistance gene; Conjugative transfer
Funding
- National Natural Science Foundation of China [41425015, 41573086, U1901210]
- Science and Technology Project of Guangdong Province, China [2017A050506049]
- Leading Scientific, Technical and Innovation Talents of Guangdong Special Support Program [2016TX03Z094]
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The study showed that under light exposure, conjugative transfer frequency significantly increased, indicating that antibiotic-resistant bacteria promoted the dissemination of antibiotic-resistance genes at the photocatalysis interface. This new perspective highlighted the important role of natural minerals and natural light in the dissemination of antibiotic-resistance genes.
Antibiotic-resistance genes (ARGs) dissemination in water environment has raised concerns worldwide. Here, antibiotic-resistant bacteria (ARB) were exposed to the interface of natural sphalerite (NS) irradiated by different light sources (UV254nm, UV365nm, simulated sunlight (SS), and visible light (VL)) in water and their effects on ARG conjugative transfer were studied. The conjugative transfer frequency increased 2- to 10-fold under exposure to Photocatalysis (PC)(NS+UV254nm) or PCNS+VL and 1- to 2-fold under PCNS+UV365nm or PCNS+SS. During exposure, bacteria were directly stimulated by light irradiation or spontaneous photocatalytic inactivation, triggering oxidative stress, DNA repair, cell repair and transfer regulation of ARB. These results indicated that ARG transfer could be promoted once ARB involving in this environmental PC interface. This new viewpoint revealed that natural minerals with natural light irradiation play an important role in ARG dissemination. Besides, this study provided more detailed information for practical application of PC sterilization and control of ARG transfer.
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