• Title/Summary/Keyword: Ultraviolet radiation

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Protective Measures From Solar Ultraviolet Radiation for Beach Lifeguards in Tuscany (Italy): Shade and Clothing Strategies

  • Daniele Grifoni;Giulio Betti;Andrea Bogi;Lucia Bramanti;Alessandra Chiarugi;Bernardo Gozzini;Marco Morabito;Francesco Picciolo;Francesco Sabatini;Lucia Miligi
    • Safety and Health at Work
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    • v.13 no.4
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    • pp.421-428
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    • 2022
  • Background: The exposure to solar ultraviolet radiation is a significant risk factor generally underestimated by outdoor workers and employers. Several studies have pointed out that occupational solar exposure increased eye and skin diseases with a considerable impact on the lives and productivity of affected workers. The main purpose of this study was to evaluate the effectiveness against ultraviolet radiation of some measures recently undertaken for the protection of lifeguards in a coastal area of Tuscany. Methods: Different shading structures (gazebos and beach umbrella) were tested during a sunny summer's day on a sandy beach by means of two radiometers; the UV protection offered by some T-shirts used by lifeguards was also tested in the laboratory with a spectrophotometer. Results: The analysed shading structures strongly reduced the ultraviolet radiation by up to 90%, however a not always negligible diffuse radiation is also present in the shade, requiring further protective measures (T-shirt, sunglasses, sunscreen, etc.); the tested T-shirts showed a very good-excellent protection according to the Australian/New Zealand standard. Conclusion: Results obtained in this study suggest how the adoption and dissemination of good practices, including those tested, could be particularly effective as a primary prevention for lifeguards who are subjected to very high levels of radiation for long periods.

Effects of Enhanced Ultraviolet-B Radiation on Plants (오존층 파괴에 의한 자외선 증가가 식물에 미치는 영향)

  • Hak Yoon Kim;Moon Soo Cho
    • Journal of Bio-Environment Control
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    • v.10 no.3
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    • pp.197-206
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    • 2001
  • The depletion of stratospheric ozone is regarded as a major environmental threat to plant growth and ecosystem. The ozone depletion has caused plants to be exposed to an increased penetration of solar ultraviolet-B (UV-B) radiation in the 280-320 nm wavelength range. Enhanced UV-B radiation may have influence on plants biological functions in many aspects including inhibition of photosynthesis, DNA damage, lipid peroxidation, changes in morphology, phenology, and biomass accumulation. To cope with the damage by UV radiation, plants have evolved to have protective mechanisms, such as photorepair, accumulation of UV-absorbing compounds, leaf thickening and activation of antioxidative enzymes. The objective of this review is to address the effects of enhanced UV-B on plant growth, UV-B action mechanisms and protection and protection mechanisms in plants.

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Protection Efficiency from Solar Radiation and Ultraviolet Radiation by Fabrics (소재에 따른 자외선.복사열 차단력)

  • 김경수;최정화
    • Journal of the Korean Home Economics Association
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    • v.40 no.10
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    • pp.77-85
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    • 2002
  • This study was conducted to evaluate the efficiency of various fabrics in protecting from solar radiation and ultraviolet radiation(UV). Six kinds of fabrics were selected and examined in singles or doubles. It was studied how the materials and the thickness of air layer between the fabric and the floor affected the protection efficiency of fabrics from sunlight. The results were as followes; 1) Protection from solar radiation: In the case of over 2 cm air layer, doubled fabric composed of aluminum coating-nylon and white or black polyester/cotton(T/C) was the most protective(p<0.001). In the case of 0 cm air layer, the case without fabric and white T/C were more effective(p<0.001). And the thicker the air layer the more effective the protection. 2) Protection from UV : Doubled fabric composed of aluminum coating-nylon and black T/C was the most protective(p<0.001) and the thinner the air layer the more effective the protection(p<0.001).

Induction of Conidioma Formation of the White Root Rot Fungus in Axenic Culture under Near Ultraviolet Light Radiation (NUV 광조사에 의한 배나무 흰날개무늬병의 분생자과 형성)

  • Lee, Jung-Sup;Park, Jong-Han;Han, Kyoung-Suk;Choi, Young-Mun;Matsumoto, Naoyuki
    • Research in Plant Disease
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    • v.9 no.1
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    • pp.42-46
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    • 2003
  • Conidiomata of the Rosellinia necatrix were induced in axenic culture under near ultraviolet light radiation. Pieces of sterilized Japanese pear twigs were placed on the 7 days-old oatmeal agar culture in plates. The plates were further incubated far 5 days and then illuminated by under near ultraviolet light radiation. Syn-nemata were developed on twigs in 19 out of 20 isolates tested within 5 weeks, and conidia were observed in 12 out of the 19 isolates. The synnemata and conidia produced were morphologically identical to those of Dematophora necatrix.

Measurement of UV radiation of LED lighting

  • Ku, Seong-Mo;Im, Jong-Min;Yi, Chin-Woo
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.25 no.3
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    • pp.7-14
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    • 2011
  • Many countries and researchers in the lighting field have focused on the LED light source as a solution to energy savings and environmental pollution. The LED light source consumes less power, has a long life and is highly economical. It is vibration and shock-resistant, and environment friendly as well. But LED lighting has some problems. In particular, the photobiological safety of LED light sources is emerging as an issue. Ultraviolet radiation from the LED light source emitted directly to the human body over a long period of time is harmful. In this paper, UV radiation from white LED was measured. Finally, the LED light source emits UV radiation, but it is relatively small when compared to others.

Development of the sunshade hat with a large brim(Part I) -Development and test with manikins- (양산형 일광차단모의 개발(제1보) -고안 및 마네킹 착용실험-)

  • 김경수;최정화
    • Journal of the Korean Society of Clothing and Textiles
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    • v.26 no.8
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    • pp.1177-1185
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    • 2002
  • This study was to develop the sunshade hat which reduced stress from solar radiation and ultraviolet radiation (UV), in order to keep the farmer's health and to promote their work efficiency. The new sunshade hat with a large brim, special structure for ventilation, stability and portability was designed and tested with manikin heads outdoors. Two newly designed sunshade hats(A, B) and three existing hat were tested Sunshade hat A made of double fabric with aluminum coating-nylon and black cotton cloth with a polyester mix(T/C) was the most protective from solar radiation. Sunshade hat B with larger brim was the most protective from ultraviolet radiation, even though it was made of aluminum coating-nylon single fabric.

Surface Discoloration of Ultraviolet (UV)-Irradiated Phyllostachys bambusoides Bamboo

  • Hyoung-Woo LEE;Eun-Ju LEE;Yoon-Jung SHIN;Ha-Yeong JO;Dae-Yeon SONG
    • Journal of the Korean Wood Science and Technology
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    • v.51 no.3
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    • pp.173-182
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    • 2023
  • Color is an attribute of visual perception and can be an important factor that affects the preference of customers toward bamboo and wood products. Solar radiation can discolor bamboo surfaces and initiate cracking. The purpose of this study is to investigate the effects of an ultraviolet (UV)-protective coating on the photodiscoloration of untreated and heat-treated Phyllostachys bambusoides bamboo surfaces. Artificial UVA radiators are set at a UVA irradiance of 2,000 W/m2 to accelerate the aging of the outer surfaces of hot-air-dried and heat-treated bamboo samples. Half of the samples are coated with transparent UV-protective paint. As the UVA radiation progresses, the discoloration prevention efficiency (DPE) of the UV-protective coating on all samples decreases gradually. The DPEs of the hot-air-dried samples are estimated to be 31.4% and 18.8% after 21 and 72 hours of artificial UVA radiation, respectively. The heat-treated samples exhibit similar trends (29.0% after 21 hours and 10.3% after 72 hours). Recoating the UV-protective paint periodically every six months is expected to minimize the discoloration of the bamboo's outer surface.

Assessing the Effects of Acrylic Resin (Paraloid B-72) on Buddhist Mural-painting conservation - Focusing on Outside Mural Paintings of Mireuk Hall in Geumsan Temple - (아크릴계 수지(Paraloid B-72)가 사찰벽화 보존에 미치는 영향에 관한 연구 - 금산사 미륵전 외벽화를 중심으로 -)

  • Lee, Kyeong-Min;Han, Kyeong-Soon;Lee, Hwa-Soo
    • 보존과학연구
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    • s.29
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    • pp.65-90
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    • 2008
  • This study examines the status and the physical features of Paraloid B-72 layers with examination of microstructure and analysis of organic matters. Paraloid B-72 layers were coated on samples from the colour layer of outer wall painting in Mireuk hall in Geumsan temple. On the basis of the previous examination result, it has made the samples which are similar to outer wall in Mireuk hall in Geumsan temple. The samples can be divided into two, one; 5% Paraloid B-72 coating and another is without coating. Then samples have been experimented under the compulsive environments of infrared radiation and immersion, thereafter compared the results of the damages and physical features between two samples. As a result of the comparison, the sample with Paraloid B-72 had more serious cracks, exfoliations and peeling layers than that of without Paraloid B-72. Otherwise, in the examination of ultraviolet radiation, the sample with Paraloid B-72 coating showed weaker physical properties, less density in structure of colour layer and less hardness in surface of colour layer than the sample without coating. The percentage of moisture content after the ultraviolet radiation was higher in the sample without Paraloid B-72 than the sample with Paraloid B-72 coating. Observing the conditions before the ultraviolet radiation, the sample with Paraloid B-72 coating demonstrated lower rate in moisture evaporation rate than the sample without Paraloid B-72. As a consequence, in examination of this samples, the change of physical features are increased in the sample with Paraloid B-72 coating than that without Paraloid B-72 when compulsive environment of heat, moisture and ultraviolet rays for a short term are imposed.

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Purpurogallin Protects Keratinocytes from Damage and Apoptosis Induced by Ultraviolet B Radiation and Particulate Matter 2.5

  • Zhen, Ao Xuan;Piao, Mei Jing;Hyun, Yu Jae;Kang, Kyoung Ah;Ryu, Yea Seong;Cho, Suk Ju;Kang, Hee Kyoung;Koh, Young Sang;Ahn, Mee Jung;Kim, Tae Hoon;Hyun, Jin Won
    • Biomolecules & Therapeutics
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    • v.27 no.4
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    • pp.395-403
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    • 2019
  • Purpurogallin, a natural phenol obtained from oak nutgalls, has been shown to possess antioxidant, anticancer, and anti-inflammatory effects. Recently, in addition to ultraviolet B (UVB) radiation that induces cell apoptosis via oxidative stress, particulate matter 2.5 ($PM_{2.5}$) was shown to trigger excessive production of reactive oxygen species. In this study, we observed that UVB radiation and $PM_{2.5}$ severely damaged human HaCaT keratinocytes, disrupting cellular DNA, lipids, and proteins and causing mitochondrial depolarization. Purpurogallin protected HaCaT cells from apoptosis induced by UVB radiation and/or $PM_{2.5}$. Furthermore, purpurogallin effectively modulates the pro-apoptotic and anti-apoptotic proteins under UVB irradiation via caspase signaling pathways. Additionally, purpurogallin reduced apoptosis via MAPK signaling pathways, as demonstrated using MAPK-p38, ERK, and JNK inhibitors. These results indicate that purpurogallin possesses antioxidant effects and protects cells from damage and apoptosis induced by UVB radiation and $PM_{2.5}$.