http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Oxidative stress in juvenile common carp (Cyprinus carpio) exposed to $TiO_2$ nanoparticles
Lee, Byoung Cheun,Kim, Kyung Tae,Cho, Jae Gu,Lee, Jae Woo,Ryu, Tae Kwon,Yoon, Jun Heon,Lee, Sang Hee,Duong, Cuong N.,Eom, Ig Chun,Kim, Pil Je,Choi, Kyung Hee 대한독성유전단백체학회 2012 Molecular & cellular toxicology Vol.8 No.4
Acute toxicity and oxidative stress caused by exposure of titanium dioxide nanoparticles ($TiO_2$-NPs) in juvenile common carp (Cyprinus carpio) were investigated. $TiO_2$-NPs solution was prepared using deionized water and dispersed by sonication. Juvenile carp were exposed to different concentrations (5, 10, 20, 40, and 80 mg/L) of $TiO_2$-NPs. $TiO_2$-NP characteristics (particle morphology, size distribution, and zeta-potential) were analyzed using transmission electron microscopy (TEM) and dynamic light scattering (DLS). Different tissue samples (skin, liver, brain, and gill) of fish were dissected, and the biochemical responses (catalase [CAT] and glutathione S-transferase [GST] activities) were measured. The results showed that acute exposure to $TiO_2$-NPs induced GST and CAT levels to vary in all observed organs. The effective concentration of $TiO_2$-NPs was 20 mg/L in the liver and brain and 40 mg/L in the gill. Histopathological changes were as follows: (1) skin: hypertrophy and increased number of mucous cells and thickening of the epidermal layer; (2) gill: hypertrophy of chloride cells, degeneration of mucous cells, and increased acidification of mucous cells; and (3) liver: hyperplasia and cytoplasm vacuolation of hepatic cells. No lethal effects were observed during the acute test. Our results show that there is a potential risk of $TiO_2$-NP exposure to aquatic organisms in the environment.
Embryo aggregation improves blastocysts quality via reducing of in vitro stress conditions
Pil-Soo Jeong,Soo-Hyun Park,Sanghoon Lee,Hyo-Gu Kang,Min Ju Kim,Nanjidsuren Tsevelmaa,Seung Hwan Lee,Young-Ho Park,Jong-Hee Lee,Bong-Seok Song,Bo-Woong Sim,Sun-Uk Kim 한국실험동물학회 2020 한국실험동물학회 학술발표대회 논문집 Vol.2020 No.2
제동 조건이 브레이크 패드의 미세먼지 발생에 미치는 영향에 대한 분석
이필구(Pil Gu Lee),정성필(Sung Pil Jung) 한국자동차공학회 2020 한국자동차공학회 부문종합 학술대회 Vol.2020 No.7
The purpose of this study is to analyze the particulate matter characteristics of brake pad dust generated during braking through the braking test. The test was carried out with a brake dynamometer and a dust collector developed in-house. For the design of the test conditions, three factors including the braking deceleration, the brake temperature and the braking speed were selected. The test and analysis were carried out under the designed test conditions, and the results of the particulate matter generation rate according to the braking conditions were obtained. As a result, the rate of particulate matter decreases as braking deceleration increases, and the rate of particulate matter increases as brake temperature and braking speed increase. However, the brake pads may be worn differently depending on the braking conditions, which may affect the total amount of particulate matter.