• 식물병연구
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• 제9권1호
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• pp.42-46
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• 2003

흰날개무늬병원균의 분생자과를 형성시키기 위하여 NUV 광을 조사하면서 무균적으로 배양하였다. 흰날개무늬병원균을 Oatmeal Agar 배지상에 7일동안 배양시킨 후 살균처리된 배나무 가지를 을려놓아 2$0^{\circ}C$실온에서 5일 동안 NUV 광을 조사하면서 배양하였다. 그 결과, 배나무 가지표면에 분생자병속이 처리 5주후에 95% 형성시킬 수 있었다. 또한, 유기된 분생자병속으로부터 63%의 분생자가 형성되는 것을 관찰하였다. 새롭게 형성된 분생자병속과 분생자의 형태적 특성은 Dematophora necatrix에 대하여 보고된 것과 동일하였다.

• Natural Product Sciences
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• 제2권2호
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• pp.90-95
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• 1996

When reserpine-producing cell strains of Rauwolfia serpentina were transferred from the dark to the light irradiation, the production of reserpine was extremely enhanced whereas the cell growth was suppressed. In an incubation period of 20 days, the most effective culture condition for reserpine production was the combination of 8 days of dark culture and following 12 days of light culture. The time courses of both cell growth and reserpine production were measured in vitro in order to clarify the effect of wave length range of light on the biosynthesis of reserpine. Although the growth of cultured cells which had been incubated under continuous red, yellow, and green lights, respectively, was similar to that of the cultured cells subcultured in the dark. The cells cultured under red light irradiation produced less reserpine than dark-grown cultures. Both blue and near-ultraviolet light inhibited the growth of cultured cells. The production of reserpine was strikingly enhanced by blue light, but was strongly inhibited by near-ultraviolet light.

• Journal of Biosystems Engineering
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• 제35권2호
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• pp.124-131
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• 2010

Chlorophyll fluorescence has been researched for assessing fruit post-harvest quality and condition. The objective of this preliminary research was to investigate the potential of fluorescence spectroscopy for measuring apple fruit quality. Ultraviolet (UV) and blue light was used as an excitation source for inducing fluorescence in apples. Fluorescence spectra were measured from 'Golden Delicious' (GD) and 'Red Delicious' (RD) apples using a visible/near-infrared spectrometer after one, three, and five minutes of continuous UV/blue light illumination. Standard destructive tests were performed to measure fruit firmness, skin and flesh color, soluble solids and acid content from the apples. Calibration models for each of the three illumination time periods were developed to predict fruit quality indexes. The results showed that fluorescence emission decreased steadily during the first three minutes of UV/blue light illumination and was stable within five minutes. The differences were minimal in the model prediction results based on fluorescence data at one, three or five minutes of illumination. Overall, better predictions were obtained for apple skin chroma and hue and flesh hue with values for the correlation coefficient of validation between 0.80 and 0.90 for both GD and RD. Relatively poor predictions were obtained for fruit firmness, soluble solids content, titrational acid, and flesh chroma. This research has demonstrated that fluorescence spectroscopy is potentially useful for assessing selected quality attributes of apple fruit and further research is needed to improve fluorescence measurements so that better predictions of fruit quality can be achieved.

• 공업화학
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• 제32권2호
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• pp.125-131
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• 2021

일반적인 반도체 기반의 광촉매는 물질 고유의 밴드갭 때문에 자외선이나 가시광선에 의해서만 활성화될 수 있고, 태양광 에너지의 약 50%를 차지하는 근적외선 영역의 에너지는 활용할 수 없다. 따라서 기존의 반도체 광촉매의 성능을 향상시키기 위해서는 자외선에서 근적외선에 이르는 넓은 영역에서 더 많은 태양광 에너지를 활용할 수 있어야 한다. 태양광의 근적외선 영역을 활용하기 위해 기존 반도체 광촉매를 업컨버전 나노입자와 결합하는 연구들이 수행되고 있다. 업컨버전 나노입자는 근적외선 광자를 여러 개 흡수하여 자외선이나 가시광선으로 변환하여 광촉매를 활성화할 수 있다. 그리고 반도체 광촉매와 업컨버전 나노입자에 플라즈모닉 금속 나노입자를 함께 결합시키면 태양광에 의한 광촉매 활성을 더욱 향상시킬 수 있다. 본 총설은 업컨버전 나노입자를 이용하여 근적외선 영역의 태양광 에너지가 광촉매의 성능 향상에 기여할 수 있도록 하는 최근의 연구결과를 바탕으로 서술하였다.

• 한국응용곤충학회지
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• 제16권4호
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• pp.211-215
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• 1977

오이류 덩굴마름병균(Didymella bryoniae)의 포자형성에 미치는 배지, 근자외선광과 화광색형광등 12시간 교호조사와 계속암흑처리의 영향을 조사하였다. Didymella bryoniae를 감자한천과 V-8 juice 한천에 배양하였을 때 광선은 병자각 및 자양각의 형성을 촉진하였으나 계속 암흑처리구의 포자형성은 낮았다. 그러나 균주에 따라서는 무광하에서도 병자각과 자양각을 형성할 수 있었다. V-8 juice 한천에 배양했을 때 자양각의 형성은 근자외선 보다는 화광색광선에서 촉진되었다. 일반적으로 광원에 관계없이 V-8 juice 한천에 배양한 것이 감자한천에 배양한 것보다 포자의 형성이 양호하였다. 감자한천에서 배양된 C. bryoniae의 각균주는 병포자의 대부분이 무격막의 소형 병포자였음에 비하여 V-8 juice 한천에 배양한 것은 무격막의 대형 병포자 또는 1개의 격막을 가진 병포자로써 병든 종자의 배축상에 형성된 배포자와 흡사하였다. 자양각의 외관은 병자각과는 판이하였으며 유두상 각공위에 백색의 포자괴가 형성되었다.

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2006년도 6th International Meeting on Information Display
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• pp.977-979
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• 2006

Organic light-emitting diodes (OLEDs) based on the double wide band gap emissive layers in the range of 380 nm to 440 nm are reported. An efficient electroluminescence with a maximum at 400nm was observed at room temperature under a forward bias about 10V. With the wide band gap organic materials for near-ultraviolet emission, the low operating voltage (5V) and high current efficiency (3 cd/A) have been obtained at $2mA/cm^2$

• 한국대기환경학회지
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• 제22권2호
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• pp.223-233
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• 2006

We analyzed the monthly and seasonal mean of the daily Erythemal Ultraviolet-B (EUV-B, $280{\sim}320nm$) irradiance operating in Pohang, Anmyeon, Gosan, Mokpo and Kangnung with UV-Biometer (Solar Light Co., Model No. 501) at clear-sky noon during the period from 1999 to 2004. Also, we investigated the seasonal and regional characteristics for the UV index over the Korean Peninsula. The daily maximum occurred near solar southing time and the highest monthly accumulated EUV-B irradiance appeared in July and August at each regional observatory. The monthly mean value of the clear-sky EUV-B irradiance in Pohang, Anmyeon, Gosan, Mokpo and Kangnung showed 196.6, 161.8, 221.9, $171.5mWm^{-2}\;and\;179.7mWm^{-2}$ near noon in July respectively. The annual mean value of the daily accumulated EUV-B irradiance in Pohang, Anmyeon, Gosan, Mokpo and Kangnung were 1.8, 2.1, 2.2, $1.8kJm^{-2}\;and\;1.5kJm^{-2}$ respectively. The UV Index (UVI) showed above UVI 7(High) more than 90 days during one year over the Korean Peninsula.

• 천문학회보
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• 제39권1호
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• pp.59.2-59.2
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• 2014

Radiative transfer models in a spherical, turbulent interstellar medium (ISM), in which the photon source is situated at the center, are calculated to investigate the correlation between the scattered light and the dust column density. The medium is modeled using fractional Brownian motion structures that are appropriate for turbulent ISM. The correlation plot between the scattered light and optical depth shows substantial scatter and deviation from simple proportionality. It was also found that the overall density contrast is smoothed out in scattered light. In other words, there is an enhancement of the dust-scattered flux in low-density regions, while the scattered flux is suppressed in high-density regions. The correlation becomes less significant as the scattering becomes closer to being isotropic and the medium becomes more turbulent. Therefore, the scattered light observed in near-infrared wavelengths would show much weaker correlation than the observations in optical and ultraviolet wavelengths. We also find that the correlation plot between scattered lights at two different wavelengths shows a tighter correlation than that of the scattered light versus the optical depth.

• 생명과학회지
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• 제10권5호
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• pp.519-523
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• 2000

The action spectrum for light-induced growth of fruit body in Pleurotus ostreatus has been studied by irradiation at various wavelengths. Effective wavelengths were distributed from near ultraviolet to blue region of spectrum. The most effect of light was observed in the region between 340 to 520 nanometers. The growth weigth obtained from which has been irradiated 144 hours in the region of 340-520 nm increases 74%, on the contrary the observed growth weight has been observed in the longer wavelengths than 620 nm. The pileus size was promoted 30$\times$32% in the region of 340-500 nm, and retarded 22$\times$19% in the dark. the strip length was rearded 12% in the region of 340-500 nm, and promoted 38% in the dark. The color thickness for pileus is getting light in longer wavelengths.

• 생명과학회지
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• 제6권3호
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• pp.193-197
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• 1996

The action spectrum for mycelial growth and fruitbody primordium formation in Pleurotus ostreatus has been studied by irradiation at various wavelengths. Effective wavelengths. Effective wavelengths were distributed from near ultraviolet to blue region of spectrum. The most effect of light was observed in the region between 340 to 500 nanometers. The light intensity required to obtain of the maximum effect at the most effective wavelengths(430-500nm), was over 6.8 mW/Cm$^{2}$. Up to 6.8 mW/Cm$^{2}$, the primordium formed about 25 hr after the start of illumination. The higher the light intensity, the earlier the formation of the primordium formation : Up to about 6.8 mW/Cm$^{2}$.