• 제목, 요약, 키워드: uv-spectra

검색결과 922건 처리시간 0.033초

Action Spectra of Apoptosis Induction and Reproductive Cell Death in L5178Y cells in UV-B Region

  • Mizuho Aoki;Yoshiya Furusawa;Higashi, Sho-ichi;Masakatsu Watanabe
    • Journal of Photoscience
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    • v.9 no.2
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    • pp.454-456
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    • 2002
  • It is important to determine the action spectrum of UV-B radiation contained in the sunlight to estimate the risk of skin cancer. We have investigated action spectra for induction of apoptosis and reproductive cell death in L5178Y cells using the Okazaki Large Spectrograph at NIBB. L5178Y cells were exposed to light at different wavelengths in UV-B or UV-A region. Frequencies of apoptosis induction and reproductive cell death were determined by counting cells with chromatin condensation, and by the colony formation assay, respectively. The measured sensitivity spectra for the two end-points were in very good agreement. Sensitivity decreased steeply with increase of wavelength in UV-B region and remains nearly constant in UV-A region. The action spectra were also slightly steeper than that for the minimum erythematic dose (MED), but very similar to the light absorption spectrum of DNA in UV-B region. On the other hand, the spectra for both endpoints were similar to MED spectrum but not DNA spectrum in the UV-A region. Also different time-course and morphological difference of apoptosis were found between UV-B (long time, fragmentation) and UV-A (short time, shrinkage) region. These results suggest that DNA damage induced by UV-B light triggers apoptosis and reproductive cell death, but other damaged targets (membrane, protein and so on) trigger these effects in UV-A region.

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소프트콘택트렌즈의 재료에 따른 광학적 특성에 관한 연구 (A Study on the Optical Properties by Material of Soft Contact Lens)

  • 손병호;정주현
    • 한국안광학회지
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    • v.14 no.2
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    • pp.27-30
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    • 2009
  • 목적: 현재 판매되어지고 있는 SCL의 건조 및 젖음 상태에 따라 UV 및 가시광선 투과율을 측정하였다. 방법: 시중에 유통 중인 5가지 종류의 재료를 건조 및 젖음 상태에 따라 Spectrophotometer로 측정하여, SCL의 광학적 특성을 조사하였다. 결과: 5가지 재료 중에서 젖음 및 건조 상태의 구별없이 일정한 투과값을 가진 재료도 있었다. 측정된 SCL의 가시광선 범위 투과율은 약 80% 이상의 투과율이 나와 광학적으로 우수하였다. 또한 대다수 SCL의 경우 UV에서 젖음 상태의 투과율이 건조 상태보다 높은 투과율을 나타냈다. 결론: 측정된 SCL의 재료 중에는 가시광선 범위에서 우수한 광학적 성능을 보였지만 대다수 SCL의 경우 UV 범위에서 높은 투과율이 나타냈다. 그러므로 앞으로 UV를 차단 기능이 있는 신소재 개발의 필요성이 강조될 것이다.

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수용성(水溶性) 아크릴 수지(樹脂)의 자외선(紫外線) 흡수제(吸收劑)와 HALS 첨가(添加)가 일본잎갈나무의 변색(變色)에 미치는 영향(影響) (Effects of UV Absorber and HALS(Hindered Amine Light Stabilizer) Addition in Water-soluble Acrylic Resin on Discoloration of Larix leptolepis (S. et Z.) Gordon)

  • 강경택;이필우
    • 목재공학
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    • v.24 no.4
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    • pp.47-55
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    • 1996
  • UV transmission spectra of water-soluble acrylic resin films containing hydroxybenzophenolic, hydroxyphenylbenzotriazolic UV absorber and HALS(hindered amine light stabilizer) were investigated by exposure time(before exposure weathered for 160 and 320hours) in QUV Weather-Ometer. Also the YID(yellowness index difference), LID(lightness index difference) and CD(color difference) of dried water-soluble acrylic resin films and the coated woods of Larix leptolepis were analyzed by addition level of UV absorber(0, 1, 2 and 3%) and HALS(0, 0.5, 1 and 1.5%) and by exposure time in QUV Weather-Ometer. They showed no significant effects on UV transmission spectra of dried water-soluble acrylic resin films in the range of 300 to 400nm irrespective of exposure time. However, UV transmission decreased as increase of exposure time. UV transmission spectra were lower in dried water-soluble acrylic resin films containing hydroxybenzophenolic UV absorber and HALS than in these containing hydroxyphenylbenzotriazolic UV absorber and HALS in the range of 350 to 400nm. The least YID, LID and CD in the coated woods of Larix leptolepis appeared at the addition level of 3%, based on non-volatile content, in hydroxybenzophenolic and hydroxyphenylbenzotriazolic UV absorber, and of 1.5% in HALS to water-soluble acrylic resin.

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균질계에서 얻은 셀룰로오스 유도체의 광이성질화 현상 연구 (Photoisomerization of Cellulose Derivatives Obtained from Homogeneous System)

  • 노영란;박근호;이수
    • 한국응용과학기술학회지
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    • v.17 no.4
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    • pp.273-278
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    • 2000
  • Cellulose tosylate(CT) was prepared by reaction of cellulose with p- toluenesulfonylchloride in DMAc/LiCl homogeneous system. In order to study a reversible photoisomerization of disperse red 1(DR-1) attached on natural polymer, cellulose tosylate containing DR-1(DR-1/CT adduct) was prepared at $110^{\circ}C$ in DMAc, and the changes of UV/Vis spectra of its solutions and thick film were investigated by alternate irradiation technique. Form the UV/Vis spectra of DR-1/CT adduct dissolved in cosolvents, such as DMAc, DMAc/THF, DMAc/benzene, and DMAc/chloroform and irradiated with 360 nm and 450 nm ligths, we found out changes of UV/Vis spectra were reversible in all solvents systems and we found out changes of UV/Vis spectra were reversible at thick film, also.

Changes in Growth and Antioxidant Contents of Romaine Lettuce by Different UV Spectra

  • Jeong, Sung Woo
    • 인간식물환경학회지
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    • v.21 no.5
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    • pp.343-350
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    • 2018
  • The current study was conducted to determine the influence of irradiations of different UV spectra on plant growth and antioxidant compounds of two romaine lettuce cultivars('Caesar green' and 'Caesar red'). The UV treatments were consisted of three UV spectra; UV-A (314-400nm), FUV-B (290-400nm) and UV-B (274-400nm), using fluorescent lamps and irradiated for 2 hours at nighttime for 11 days under greenhouse. As the results, there were no differences in growth parameters and antioxidant compounds between UV-A treatments and control in two cultivars. On the other hand, FUV-B treatment increased significantly the contents of UV absorbing compounds, ${\beta}$-carotene, lutein, total phenolic compounds and anthocyanin in caesar green cultivar. It also increased UV absorbing compounds, total phenolic compounds and anthocyanin contents in caesar red cultivar without any growth reduction. UV-B treatment, however, decreased lutein, chlorophyll contents and caused growth reduction and physiological damage such as leaf chlorosis and wrinkle in both cultivars. Overall, the results indicate that supplemental FUV-B treatment, at least in part, may increase antioxidant compounds without any inhibitory effect on shoot growth in romaine lettuce. The results of the current study present a useful practical technique for increasing antioxidant compounds of romaine lettuce production in greenhouse horticulture.

자외선 흡수제 처리 면직물의 소비성능 개선(제1보) - 자외선 차단성능에 관한 연구 - (A Study on the UV-cut Properties of Cotton Fabrics Treated with UV-absorber)

  • 강미정;권영아
    • 한국의류학회지
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    • v.25 no.5
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    • pp.925-932
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    • 2001
  • The influence of ultraviolet(UV)-ray in sun light on human skin has been noted. Textiles can provide protection against harmful UV-radiation. Normally UV-absorbing finishes are used to get better protection. The purpose of this study is to evaluate the UV-cut properties of cotton fabrics treated with UV-absorber. 2,2-dihydroxy-4,4-dimethoxbenzophenone, as UV-absorber was applied to 100% cotton fabric. Reagents added in finishing solution were Triton X-100, polyethylene glycol 400, and $MgCl_2{\cdot}6H_2O$, and C.I. Direct Red 81. Both untreated and treated cotton fabrics were exposed to a xenon arc lamp for 20 and 80 hours. UV absorption spectra of finishing solutions and UV transmission spectra of fabrics were measured by the UV/VIS spectrophotometer. The results of this study can be summarized as follows. The results of this study can be summarized as follows. Absorption and the related transmission spectra were modified in a controlled way with UV-absorber. Absorption effect of UV-absorber was improved by adding Triton X-100, PEG 400, and $MgCl_2{\cdot}6H_2O$ in finishing solution. The UV absorption of finishing solution was in the following order: U/D/T/P/M>D/T/P/M> D/T> D/P, D>U/T/P/M>U/T>T/P/M>T. The UV transmittance of cotton fabrics was remarkably decreased by the application of UV-absorber and additives. The UV-cut properties were most improved by the application of U/D/T/P/M.

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호장근 추출액에 의한 염색성(II) -호장근 추출액의 자외 . 가시부 분광 특성 - (The Dyeing Properties of Korean Knotweed Extract( II ) - The UV-visible Spectrophotometric Characteristics of Korean Knotweed Extracts -)

  • 김미숙;최석철
    • 한국염색가공학회지
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    • v.13 no.5
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    • pp.298-305
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    • 2001
  • The Purpose of this study was to investigate spectrophotometric characteristics of Korean knotweed extracts. The properties were evaluated by it's extracting solvent, effect of metallic ion, variations of pH values and effect of light exposure. The results were as following; The highest absorbance was found in methanol extract of Korean knotweed, while the lowest absorbance was carbon tetrachloride extract. The UV-vis. spectra of Korean knotweed colors in several solvents showed hypsochromic shift of $n->\pi^*$ transition with the polarity of solvent. Absorbance and peak of UV-vis. spectra of Korean knotweed colors became lower and broader by addition of metallic ion. The light stability in irradiation with xenon ]amp of the color solution with Cu were higher than those of Al and Fe. The UV-vis. spectra of Korean knotweed extracts in various pH values showed bathochromic shift under alkaline condition, and their Peaks disappeared after 5 hours exposure.

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Mg II LINE VARIATION OF 32 CYGNI

  • Kang, Young-Woon
    • Journal of Astronomy and Space Sciences
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    • v.9 no.2
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    • pp.154-164
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    • 1992
  • The Mg II lines been extracted from the IUE archival spectra of 32 Cygni to investigate the effect of the atmospheric eclipse. The UV light curve has been reduced from the continuum flux at the center wavelength of 2807.5 ${\AA}$ in the IUE spectra. The equivalent width of the Mg II k absoption line has been measured for each spectra. The results of the light variation and flux tracing of the absorption line at the vicinity of the primary eclipse confirmed the atmospheric eclipse. The atmospheric effect lasted until the phase 0.06 in the absorptin line tracing, while it lasted until the phase 0.02 in the UV light curve, respectively.

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Phototoxicity of Melatonin

  • Kim, Young-Ok;Chung, Hye-Joo;Chung, Seung-Tae;Kim, Jin-ho;Park, Jae-Hyun;Kil, Kwang-Sup;Cho, Dae-Hyun
    • Archives of Pharmacal Research
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    • v.22 no.2
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    • pp.143-150
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    • 1999
  • melatonin (MLT), N-acetyl-5-methoxytryptamine, is mainly secreted by the pineal gland. The ultraviolet (UV), infrared (IR) and 1H-NMR spectra of irradiated and non-irradiated MLT were measured, and phototoxicity tests of MLT, anthracence (positive control) and sodium lauryl sulfate (SLS, negative control) were performed. The methods employed include both in vitro test such as MTS assay using the human fibroblast cell and yeast growth inhibition assay using Candida albicans and in vivo method using the skin of guinea pig. UV absorption spectra and 1H-NMR spectra of MLT were changed by UVA (365 nm, 15 J/$\textrm{cm}^2$), but IR spectra of MLT were not changed. The fifty percent inhibitory concentration (IC50) ratio (UV-/UV+) of MLT was 10. The inhibition zone of irradiated-paper disks treated with MLT was not observed. According to the results of histophathological examination, no pathologic lesion was observed in the non-irradiated group, but slight degeneration of keratinocytes in the epidermis, homorrhage and vasodilation in dermis were observed in the irradiated group. These results indicated that the molecular structure of MLT is altered by UVA to unidentified photoproducts and a moderate phototoxicity of MLT is predicted.

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