• 한국독성학회:학술대회논문집
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• 한국독성학회 2003년도 추계학술대회
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• pp.131-131
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• 2003

Benzophenone is an UV-absorbing agent that has been used in industry and medicine for more than 30 years. Its twelve derivatives, designated benzophenone-1 through benzophenone-12, are widely used today in cosmetic products as a photostabilizer, a sunscreen in lotions, and hair sprays to protect the skin and hair from UV irradiation.(omitted)

• 한국환경성돌연변이발암원학회:학술대회논문집
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• 한국환경성돌연변이발암원학회 2003년도 추계학술대회
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• pp.131-131
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• 2003

• Bulletin of the Korean Chemical Society
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• 제23권2호
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• pp.315-319
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• 2002

Visible surface-assisted desorption/ionization mass spectrometry (SALDI-MS) has been investigated for several small macromolecules deposited on the graphite plate using laser radiation at 532 nm where most of the macromolecules are transparent. The graphite surface functioned well as a photon absorbing material and an energy transfer mediator for visible light. The results show that visible SALDI is a much softer ionization technique than UV-MALDI and FAB-MS in our results with synthetic macromolecules, PPG, PPGMBE and cavitand molecules. For the SALDI of biomolecules, glycerol as a proton source was essential with the graphite plate. As in visible SALDI, the role division of the photon absorbing material and the cationization agent can provide a generality in mass spectrometric analysis of macromolecules compared with MALDI using the dual functional matrix.

• 한국환경과학회지
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• 제19권12호
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• pp.1323-1334
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• 2010

The effect of nitric oxide (NO) on antioxidant system and protective mechanism against oxidative stress under UV-B radiation was investigated in leaves of maize (Zea mays L.) seedlings during 3 days growth period. UV-B irradiation caused a decrease of leaf biomass including leaf length, width and weight during growth. Application of NO donor, sodium nitroprusside (SNP), significantly alleviated UV-B stress induced growth suppression. NO donor permitted the survival of more green leaf tissue preventing chlorophyll content reduction and of higher quantum yield for photosystem II than in non-treated controls under UV-B stress, suggesting that NO has protective effect on chloroplast membrane in maize leaves. Flavonoids and anthocyanin, UV-B absorbing compounds, were significantly accumulated in the maize leaves upon UV-B exposure. Moreover, the increase of these compounds was intensified in the NO treated seedlings. UV-B treatment resulted in lipid peroxidation and induced accumulation of hydrogen peroxide ($H_2O_2$) in maize leaves, while NO donor prevented UV-B induced increase in the contents of malondialdehyde (MDA) and $H_2O_2$. These results demonstrate that NO serves as antioxidant agent able to scavenge $H_2O_2$ to protect plant cells from oxidative damage. The activities of two antioxidant enzymes that scavenge reactive oxygen species, catalase (CAT) and ascorbate peroxidase (APX) in maize leaves in the presence of NO donor under UV-B stress were higher than those under UV-B stress alone. Application of 2-(4-carboxyphenyl)-4, 4, 5, 5-tetramethylimidazoline-1-oxyl-3- oxide (PTIO), a specific NO scavenger, to the maize leaves arrested NO donor mediated protective effect on leaf growth, photosynthetic pigment and free radical scavenging activity. However, PTIO had little effect on maize leaves under UV-B stress compared with that of UV-B stress alone. $N^{\omega}$-nitro-L-arginine (LNNA), an inhibitor of nitric oxide synthase (NOS), significantly increased $H_2O_2$ and MDA accumulation and decreased antioxidant enzyme activities in maize leaves under UV-B stress. This demonstrates that NOS inhibitor LNNA has opposite effects on oxidative resistance. From these results it is suggested that NO might act as a signal in activating active oxygen scavenging system that protects plants from oxidative stress induced by UV-B radiation and thus confer UV-B tolerance.

• 공업화학
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• 제24권4호
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• pp.391-395
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• 2013

본 연구에서는 자외선 흡수 물질로 잘 알려진 zinc oxide (ZnO) 나노분말을 세 가지 합성조건에서 수열합성법으로 합성하였다. 또한, 분산성을 향상시키기 위하여 합성된 ZnO 나노분말의 표면을 다양한 실란계 계면활성제를 사용하여 표면 개질하였고, 표면개질된 ZnO 나노분말을 분산제로 72 h 동안 볼밀링하여 분산 졸 시료를 제조하였다. 30 nm 크기로 합성된 ZnO 나노분말을 3-chloropropyl trimethoxy silane로 표면개질하여 폴리우레탄계 분산제로 제조한 분산 졸 시료가 가장 높은 자외선 차단 특성 및 가시광 투과율을 가지면서 분산 안정성이 가장 우수하였다.