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. 2020 Apr 28;8:358. doi: 10.3389/fchem.2020.00358

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Copyright © 2020 Huang, Chen, Pei, Xu, Jiang, Niu and Wang.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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(A) After 72 h, DOX release from PPID-NPs with or without US irradiation (1 MHz, 1.0 W/cm²). (B) Oxygen content of water and PPID-NPs. (C) Time-dependent ¹O₂ generation of PPI-NPs as irradiated by US (1 MHz, 1.0 W/cm²). The concentration of IR780 was 21.6 μg/mL. (D) The time-dependent fluorescence increment of SOSG under ultrasound irradiation.