• Title/Summary/Keyword: atmospheric environment factor

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Cellular and Molecular Responses of a Filamentous Fungus Neurospora Crassa to Non-thermal Plasma at Atmospheric Pressure

  • Park, Gyung-Soon;Ryu, Young-Hyo;Hong, Young-June;Uhm, Han-Sup;Choi, Eun-H.
    • Proceedings of the Korean Vacuum Society Conference
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    • 2012.02a
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    • pp.476-476
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    • 2012

  • Although plasma is an efficient means of microbial sterilization, mechanism of plasma effect on microorganisms still needs to be clarified. In addition, a limited number of studies are available on eukaryotic microorganisms such as yeast and fungi in relation to plasma application. Thus, we investigated cellular and molecular aspects of plasma effects on a filamentous fungus, Neurospora crassa by making use of argon plasma jet at atmospheric pressure. The viability and cell morphology of N. crassa spores exposed to plasma were both significantly reduced depending on the exposure time when treated in water. The intracellular genomic DNA content was dramatically reduced in fungal tissues after a plasma treatment and the transcription factor tah-3 was found to be required for fungal tolerance to a harsh plasma environment.

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Quantitative Analysis of CO2 Reduction by Door-opening in the Subway Cabin (출입문 개폐에 의한 전동차 객실 CO2 저감효과 분석)

  • Kwon, Soon-Bark;Cho, Young-Min;Park, Duck-Shin;Park, Eun-Young
    • Journal of Korean Society for Atmospheric Environment
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    • v.24 no.2
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    • pp.153-161
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    • 2008

  • The guidelines for indoor air quality of public transportations such as subway, train and bus was presented by Korean Ministry of Environment last end of year 2006 based on the great consequence of indoor air quality in daily life. Two main parameters, carbon dioxide($CO_2$) and particulate matters smaller than $10\;{\mu}m(PM_{10})$, were selected as index pollutants for the management of indoor air quality. The former pollutant, $CO_2$, is regarded as index of ventilation status and the major source of $CO_2$ in the train or subway is the exhalation of passengers. It is publically perceived that the high $CO_2$ concentration in a crowded subway will be reduced and ventilated with outdoor air by door-opening taken every 2 or 3 minutes when the train stops each station. However, there has not been any scientific proof and quantitative information on the effect of door-opening on the $CO_2$ reduction by ventilation with outdoor air. In this study, $CO_2$ concentration and number of passengers were measured at each station on the 3 lines of Korail metropolitan subway. In order to evaluate the effect of $CO_2$ reduction by door opening, the theoretical approach using the $CO_2$ balance equation was performed. By comparing the predicted data with monitoring one, the optimum $CO_2$ dilution factor was determined. For the first time, it was quantified that about 35% of $CO_2$ concentration in the subway indoor was removed by the door-opening at each station.

  • https://doi.org/10.5572/KOSAE.2008.24.2.153 인용 PDF KSCI