• 제목/요약/키워드: incomplete combustion

검색결과 141건 처리시간 0.028초

PAH regualtion of CYP1 gene in MCF-7 & ZR-75-1 human breast cancer cells

  • Min, Kyung-Nan;Kim, Ja-Young;Kang, So-Hee;Seo, Mi-Jung;Sheen, Yhun-Yhong
    • 대한약학회:학술대회논문집
    • /
    • 대한약학회 2003년도 Proceedings of the Convention of the Pharmaceutical Society of Korea Vol.1
    • /
    • pp.182.2-183
    • /
    • 2003
  • Recent industrial society has human widely exposed to PAHs that are comming from the incomplete combustion of organic material as widerspread environmetal contaminants. Biological activities of PAHs are not known although PAHs are considered as carcinogens. The mechanism of action of PAHs has been studied extensively, however it is not clear how PAHs turn on CYP1A1 in human breast cancer. (omitted)

  • PDF

소형 가솔린엔진의 포름알데히드 배출특성 및 저감법에 관한 연구 (Characteristics of Formaldehyde Emission from Small Gasoline Engine and Its Reduction Technology)

  • 최병철;이남석
    • 동력기계공학회지
    • /
    • 제3권2호
    • /
    • pp.20-25
    • /
    • 1999
  • Experiments were carried out to investigate the characteristics of formaldehyde emission from the small gasoline engine and its reduction technologies. Catalytic converters used are Pt/Rh, Pd/Rh, Pd/Pt, $62cell/cm^2$ monolith type. The measurement of formaldehyde was conducted by using the method of DNPH-GC. From the experimental results, formaldehyde emission increased in a lean mixture due to incomplete combustion of the hydrocarbons. The order of catalytic activity of formaldehyde oxidation was Pt/Rh > Pd/Rh > Pd/Pt. As the distance from the exhaust manifold to the inlet of the catalyst became far, in spite of lower catalyst temperature, formaldehyde concentration decreased because of the adsorption of formaldehyde.

  • PDF

Disturbance in Testosterone Production in Leydig Cells by Polycyclic Aromatic Hydrocarbons

  • Oh, Seunghoon
    • 한국발생생물학회지:발생과생식
    • /
    • 제18권4호
    • /
    • pp.187-195
    • /
    • 2014
  • Polycyclic aromatic hydrocarbons (PAHs), which are ubiquitous in the air, are present as volatile and particulate pollutants that result from incomplete combustion. Most PAHs have toxic, mutagenic, and/or carcinogenic properties. Among PAHs, benzo[a]pyrene (B[a]P) and dimethylbenz[a]anthracene (DMBA) are suspected endocrine disruptors. The testis is an important target for PAHs, yet effects on steroidogenesis in Leydig cells are yet to be ascertained. Particularly, disruption of testosterone production by these chemicals can result in serious defects in male reproduction. Exposure to B[a]P reduced serum and intratesticular fluid testosterone levels in rats. Of note, the testosterone level reductions were accompanied by decreased steroidogenic acute regulatory protein (StAR) and $3{\beta}$-hydroxysteroid dehydrogenase isomerase ($3{\beta}$-HSD) expression in Leydig cells. B[a]P exposure can decrease epididymal sperm quality, possibly by disturbing the testosterone level. StAR may be a key steroidogenic protein that is targeted by B[a]P or other PAHs.

Volatile Flavor Compounds in Commerical Liquid Smokes

  • Park, Sung-Young;Kim, Hun;Cho, Woo-Jin;Lee, Young-Mi;Lee, Jung-Suck;Cha, Yong-Jun
    • 한국어업기술학회:학술대회논문집
    • /
    • 한국어업기술학회 2001년도 추계 수산관련학회 공동학술대회발표요지집
    • /
    • pp.141-142
    • /
    • 2001
  • Liquid smoke is made by concentration of smoke generated from charcoal of broad-leaved trees, or by refinement of smoke originated from incomplete combustion of wood condensate (Park et al., 1994). Generally, it is well known that phenol and its derivatives have antioxidative effect, while acids and formaldehyde have antimicrobial effect (Park et al., 1994). Meanwhile, some studies (Alonge, 1988; Dungel, 1961) reported that the high incidence of stomach cancer has been associated with the consumption of smoked fishes, and these were investigated to direct intake of fishes treated with smoke, containing polycyclic aromatic hydrocarbons(PAHs)(Moret et al., 1999). (omitted)

  • PDF

페난트렌에 의한 임파구 DNA의 산화적 손상과 인삼추출물에 의한 억제 (Phenanthrene-induced Oxidative DNA Damage of Lymphocytes and the Suppression by Ginseng Extract)

  • 유아름;이미영
    • Journal of Ginseng Research
    • /
    • 제33권4호
    • /
    • pp.355-360
    • /
    • 2009
  • Phenanthrene ($C_{14}H_{10}$) is a polycyclic aromatic hydrocarbon with three aromatic rings, and it can be produced by incomplete combustion of fossil fuels. Comet assay was used to examine the oxidative DNA damage of lymphocytes by phenanthrene and to measure the suppressive effects of ginseng extract on the DNA damage in this investigation. The in vitro oxidative DNA damage by phenanthrene increased in a dose-dependent manner in the lymphocyte. However, the DNA damage was significantly inhibited by ascorbate. Moreover, pretreatment, cotreatment and posttreatment with ginseng extract enhanced lymphocyte resistance to the phenanthrene-induced DNA damage. Phenanthrene enhanced the generation of intracellular reactive oxygen species, and the elevated reactive oxygen species level was reduced by treatment with ginseng extract.

화재시 생성된 유독가스로부터의 소방 안전관리 방안 연구(Co 가스 대책을 중심으로) (A Study on the Fire Safety Management measures from during a fire toxic gases generated (Focus to Co gas measures))

  • 김병석;장병집;최만철
    • 대한안전경영과학회:학술대회논문집
    • /
    • 대한안전경영과학회 2011년도 추계학술대회
    • /
    • pp.55-66
    • /
    • 2011
  • Recently developed a variety of architectural interior decoration according hwadoeme type of toxic gases generated during fire also are becoming diversified, resulting in fatal casualties occurred in the trend is also being increased. During a fire, toxic gas that is generated varies depending on the combustible material occurs. However, all combustible materials, including carbon, incomplete combustion of carbon monoxide which is generated in the most common toxic gases can be seen as one. Accordingly, in this study of organic solids that are generated in case of fire toxic gases, and briefly discuss the characteristics of the risks and, by far the most common Co gas for measures to prevent human casualties, seolbijeok, the temperature dependence, divided into four aspects of administrative daechaekdeung explained.

  • PDF

사소마그네시아와 인산염을 활용한 무기접착재의 붕사첨가율에 따른 강도특성 (Strength properties of inorganic adhesives using dead burned magnesia and phosphate according to addition ratio of borax)

  • 김대연;편수정;임정준;이상수
    • 한국건축시공학회:학술대회논문집
    • /
    • 한국건축시공학회 2018년도 추계 학술논문 발표대회
    • /
    • pp.48-49
    • /
    • 2018
  • Recently the old buildings have been increasing and increasing reconstruction. As a result, the frequency of use of architectural adhesives has increased. Adhesives are not only used for bonding but also for building materials used in various fields. However, since the adhesive is made of an organic material, it causes various skin diseases and sick house syndrome, and when a fire occurs, harmful substances are generated, and incomplete combustion may cause personal injury. Therefore, in this study, to solve the disadvantages of conventional adhesives, we tried to develop inorganic adhesives using inorganic materials.

  • PDF

고체전해질 전지 반응기를 이용한 일산화탄소의 제거 (Removal of carbon monoxide using a solid electrolyte cell reactor)

  • 신석재;오인환
    • 한국안전학회지
    • /
    • 제11권3호
    • /
    • pp.112-118
    • /
    • 1996
  • When fossil fuels are burned they produce CO gas because of incomplete combustion. If the CO gas reacts with the hemoglobin in the red blood cells, it may result in death or sequelae. Generally, the CO gas is eliminated in the form of the $$$CO_2$ gas by the oxidation reaction over the platinum catalyst. In this study, the electrochemical CO removal was investgated by using the solid electrolyte cell reactor, the type of which was represented as reactants$/Pt/Y_2O_3-ZrO_2/Pt/Air$. If the overpotential was applied to the platinum working electrode, the conversion could be changed with the overpotential applied. It was found that the oxidation rate could be increased 2.8 times higher than that of the normal condition, i. e. under open circuit conditions when $P_{co}/P_{O_2}$ was 0.5 and overpotential was 0.9V. From these results, it is concluded that the reactor used in this study is more efficient than conventional catalytic reactors.

  • PDF

축소 모의된 구획 화재의 흘림 실험에 대한 인화성 액체의 화재 패턴 해석 (Analysis of Fire Patterns of Flammable Liquids for Oil Flow Tests of Compartment Fires with Reduced Simulation)

  • 조희수;최충석
    • 한국화재소방학회논문지
    • /
    • 제28권3호
    • /
    • pp.43-48
    • /
    • 2014
  • 본 연구는 구획된 공간에 인화성 단일 물질을 채우고 착화된 화염의 전파 속도, 방사 범위, 확산 패턴 및 연소 완료 시간 등을 해석하는 데 있다. 화염의 전파 속도는 등유가 0.2 s로 가장 빠르고, 알코올이 82.1 s로 가장 늦었다. 화염이 착화된 후 화염이 가장 빠르게 최성기에 도달한 것은 시너이었고 19.0 s가 걸렸다. 그리고 가장 늦은 것은 알코올로 138.6 s로 측정되었다. 인화성 액체 200 ml가 연소 완료되는 시간은 시너가 79.9 s로 가장 짧았고, 가솔린 135 s, 등유 170 s, 경유 231.4 s, 알코올 337.0 s 등으로 측정되었다. 그리고 인화성 액체가 연소될 때 화염의 하단 부분은 층류 패턴이 지배하였고, 상단 부분은 난류 패턴을 나타냈다. 대두유의 실험에서 착화시킨 화원을 제거하면 화염은 자연 소화되어 연소가 진행되지 않았고, 불완전 연소에 따른 흰색의 연기가 발생하는 것을 알 수 있었다.

모델 가스터빈 연소기에서 합성가스 연소성능시험 - Part 2 : NOx/CO 배출특성, 온도특성, 화염구조 (Combustion Performance Test of Syngas Gas in a Model Gas Turbine Combustor - Part 2 : NOx/CO emission Characteristics, Temperature Characteristics and Flame Structures)

  • 이민철;윤지수;주성필;윤영빈
    • 한국항공우주학회지
    • /
    • 제41권8호
    • /
    • pp.639-648
    • /
    • 2013
  • 본 논문은 부게넘 및 태안 IGCC플랜트의 연료를 대상으로 석탄으로부터 생성된 합성가스의 NOx/CO배출 특성, 온도특성, 화염의 구조에 대해 기술하였다. GE7EA 모사 가스터빈 연소기를 대상으로 상압 고온 연소시험을 수행하여 입열량 및 질소희석에 따른 연소특성을 관찰하였다. 입열량이 감소하고, 희석제량이 증가할 때 단열화염온도의 감소로 NOx가 감소하였고, 저부하에서는 희석량이 증가할수록 불완전 연소로 인해 CO가 증가하였다. 이러한 NOx 감소 및 CO발생은 각각 $1500^{\circ}C$$1250^{\circ}C$의 특정 화염온도에서 관찰되었다. 또한 질소 희석이 증가할수록 단열화염온도 및 연소기 라이너의 온도가 감소했고, 화염 부상과 같은 화염구조의 변화로 인해 특이점이 관찰되었다. 본 연구결과를 통해 질소희석이 NOx/CO배출 및 온도, 화염구조에 미치는 영향이 검토되었으며, 시험 데이터는 향후 태안 IGCC 플랜트의 운전시 최적 조건 선정을 위한 기초자료로 활용될 예정이다.