Institution
National Institute of Environmental Research
Government•Incheon, South Korea•
About: National Institute of Environmental Research is a government organization based out in Incheon, South Korea. It is known for research contribution in the topics: Aerosol & Population. The organization has 1326 authors who have published 1547 publications receiving 31285 citations.
Topics: Aerosol, Population, Water quality, Air quality index, Diesel fuel
Papers published on a yearly basis
Papers
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TL;DR: This is the first quantitative demonstration that the concentration of OH radicals and the biocidal activity is linearly correlated, which indicates that the OH radical is the primary oxidant species responsible for inactivating E. coli in the UV/TiO2 process.
752 citations
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TL;DR: It seemed that AgNPs were ionized in the cells to cause cytotoxicity by a Trojan-horse type mechanism suggested by previously reported studies.
669 citations
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TL;DR: It seems that MS-2 phage is inactivated mainly by the free hydroxyl radical in the solution bulk but that E. coli might also be inactivated by other ROS, such as O2·− and H2O2, according to the present results.
Abstract: Despite a wealth of experimental evidence concerning the efficacy of the biocidal action associated with the TiO2 photocatalytic reaction, our understanding of the photochemical mechanism of this particular biocidal action remains largely unclear. It is generally accepted that the hydroxyl radical (·OH), which is generated on the surface of UV-illuminated TiO2, plays the main role. However, our understanding of the exact mode of action of the hydroxyl radical in killing microorganisms is far from complete, and some studies report that other reactive oxygen species (ROS) (H2O2 and O2·−, etc.) also play significant roles. In particular, whether hydroxyl radicals remain bound to the surface or diffuse into the solution bulk is under active debate. In order to examine the exact mode of action of ROS in inactivating the microorganism, we tested and compared the levels of photocatalytic inactivation of MS-2 phage and Escherichia coli as representative species of viruses and bacteria, respectively. To compare photocatalytic microbial inactivation with the photocatalytic chemical degradation reaction, para-chlorobenzoic acid, which rapidly reacts with a hydroxyl radical with a diffusion-limited rate, was used as a probe compound. Two different hydroxyl radical scavengers, tert-butanol and methanol, and an activator of the bulk phase hydroxyl radical generation, Fe2+, were used to investigate their effects on the photocatalytic mode of action of the hydroxyl radical in inactivating the microorganism. The results show that the biocidal modes of action of ROS are very different depending on the specific microorganism involved, although the reason for this is not clear. It seems that MS-2 phage is inactivated mainly by the free hydroxyl radical in the solution bulk but that E. coli is inactivated by both the free and the surface-bound hydroxyl radicals. E. coli might also be inactivated by other ROS, such as O2·− and H2O2, according to the present results.
499 citations
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TL;DR: It is suggested that repeated oral administration of nano-sized AgNPs may cause organ toxicity and inflammatory responses in mice.
496 citations
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TL;DR: In this paper, the spatial configuration of land uses within watersheds in South Korea and examined how spatial patterns of urban, agricultural, and forest land uses measured at both landscape and class levels, related to water quality in adjacent reservoirs from landscape ecological perspective.
433 citations
Authors
Showing all 1342 results
Name | H-index | Papers | Citations |
---|---|---|---|
Amir Hossein Mahvi | 63 | 686 | 15816 |
Kyunghee Choi | 52 | 271 | 11353 |
Ole Hertel | 50 | 229 | 7394 |
Yoon-Seok Chang | 50 | 171 | 7779 |
Akio Sugino | 49 | 94 | 9107 |
Chul-Ho Lee | 46 | 309 | 7736 |
Henrik Skov | 45 | 141 | 5666 |
Sunyoung Park | 37 | 218 | 5683 |
Jinwon Park | 35 | 219 | 4092 |
Steen Solvang Jensen | 34 | 121 | 3812 |
Young Sun Mok | 33 | 203 | 4080 |
Namsoo Chang | 30 | 134 | 2643 |
Wookeun Bae | 27 | 78 | 2112 |
Kwang Hee Lee | 26 | 115 | 2748 |
Bo-Eun Lee | 25 | 69 | 1984 |