• Title/Summary/Keyword: bis (2-ethylhexyl)phthalate

Search Result 25, Processing Time 0.022 seconds

HSP70 and HSC70 gene Expression in Chironomus Tentans (Diptera, Chironomidae) larvae Exposed to Various Environmental Pollutants: Potential Biomarker for Environmental Monitoring

  • Lee Sun Mi;Choi Jin Hee
    • Environmental Mutagens and Carcinogens
    • /
    • v.25 no.1
    • /
    • pp.32-39
    • /
    • 2005
  • In order to identify potential biomarkers of environmental monitoring, we evaluated heat shock genes expressions as effects of various environmental pollutants (nonylphenol, bisphenol-A, 17a­ethynyl estradiol, bis(2-ethylhexyl)phthalate, endosulfan, paraquat dichloride, chloropyriphos, fenitrothion, cadmium chloride, lead nitrate, potassium dichromate, benzo[a]pyrene and carbon tetrachloride) on larvae of aquatic midge Chironomus tentans (Diptera, Chironomidae). Heat shock protein 70 gene expression increased in most of chemicals treated larvae compared to control. The response was rapid and sensitive to low chemical concentrations but not stressor specific. In conjunction with stressor specific biomarkers, heat shock protein 70 gene expression in Chironomus might be developed for assessing exposure to environmental stressors in the fresh water ecosystem. Considering the potential of Chironomus larvae as biomonitoring species, heat shock gene expression has a considerable potential as a sensitive biomarker for environmental monitoring in Chironomus.

  • PDF

$TiO_2$ Photoanode on Dye-Sensitized and Electrochemical Properties of Solar Cells (염료감응형 태양전지용 $TiO_2$ 광전극의 전기화학적 특성)

  • Jin, En-Mei;Park, Kyung-Hee;Gu, Hal-Bon;Park, Bok-Kee
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
    • /
    • 2008.11a
    • /
    • pp.253-254
    • /
    • 2008
  • The $TiO_2$ Pastes was prepared with the starting materials of $TiO_2$ (P-25), ethyl cellulose, a-terpineol and bis(2-ethylhexyl) phthalate, and this $TiO_2$ paste application for dye-sensitized solar cells (DSSCs) were investigated. In order to improved transparency of $TiO_2$ photoanode films, $TiO_2$ paste was changed ethyl cellulose and a-terpineol contents. The morphology of prepared $TiO_2$ films were investigated by field emission scanning electron microscopy (FE-SEM). The electrochemical properties of the thin films and the performance of DSSCs were measured by photovoltaic-current density and AC impedance. Energy conversion efficiency was obtained about 5.7% at ethyl cellulose and a-terpineol on best mixed ratio under illumination with AM 1.5 ($100mWcm^{-2}$)simulated sunlight.

  • PDF

Phytochemical Studies on Lonicera Caulis (2) - Aliphatic and Phenolic Compounds (인동의 성분연구 (2) - 지방족 및 페놀성 화합물)

  • Kim, Ju-Sun;Yean, Min-Hye;Seo, Hyun-Kyu;Lee, Je-Hyun;Kang, Sam-Sik
    • Korean Journal of Pharmacognosy
    • /
    • v.40 no.4
    • /
    • pp.326-333
    • /
    • 2009
  • Fourteen compounds were isolated from the 70% ethanol extract of Lonicera Caulis (Caprifoliaceae) and their structures were identified as seven aliphatic compounds [long-chain alcohols (1, 2), trilinolein (3), hexacosanol (4), fatty acids (6), 9,12,13-trihydroxyoctadeca-10(E),15(Z)-dienoic acid (10), and pinellic acid (11)] and seven phenolics [bis(2-ethylhexyl) phthalate (dioctylphthalate, DOP) (5), coniferaldehyde (7), caffeic acid docosanoyl ester (8), caffeic acid (9), coniferyl aldehyde 4-O-glucoside (12), linarin (13), and coniferin (14)]. The chemical structures of these compounds were identified on the basis of spectroscopic methods and comparison with literature values. All the compounds except for caffeic acid (9) were isolated from this plant parts for the first time.

Analysis of Octylphenol, Nonylphenol, Di-octylphthalate in Sewage Sludge by GC/MS-SIM (GC/MS-SIM에 의한 하수 슬러지중에 포함된 Octylphenol, Nonylphenol, Di-octylphthalate의 정량)

  • Kim, Jong-Hun
    • Analytical Science and Technology
    • /
    • v.12 no.3
    • /
    • pp.248-255
    • /
    • 1999
  • Sewage sludge samples were extracted with dichlomethane by Soxhlet extraction. The extracts were analysed for the endocrine disrupting compounds (EDC), octylphenol(OP), nonylphenol (NP) and bis (2-ethylhexyl)phthalate (DOP) using GC/MS-SIM. In industrial sewage sludge (sample Z-1) the concentration of NP and DOP were respectively $1168{\mu}g/g$ and $1172{\mu}g/g$ whereas in domestic sludge (sample Z-2) the concentration were respectively $10.8{\mu}g/g$ and $80{\mu}g/g$. OP was not detected in Z-2, but detected a small amount in Z-2 of the samples. Environmental EDC have been shown to affect the fertility of range of living organisms, including humans, and the high levels of NP and DOP in industrial sewage sludge could have serious implications for the reproductive health of humans particularly if the compounds entered the human food chain through water or the ingestion of vegetables or animal products.

  • PDF

Development of Vibraction and Impact Noise Dampling Wood-based Composites(I) -Dynamic Mechanical and Vibration Damping Properties of Plasticized PVC- (진동.충격음 흡수성능을 지니는 목질계 복합재료의 개발(I) -가소화 폴리염화비닐의 동적점탄성과 진동흡수성능-)

  • 이현종
    • Journal of Korea Foresty Energy
    • /
    • v.17 no.1
    • /
    • pp.36-46
    • /
    • 1998
  • The aim of this study was to develop the noise and vibration damping wood-based composites by using viscoelastic polymer materials. Polyvinylchloride(PVC) was plasticized with 20-140 phr bis(2-ethylhexyl) phthalate(DOP) and the dynamic tensile mechanical properties were measured at 110Hz and approximate temperature range -100 to 150$^{\circ}$ using a Rheovibron Instrument. The PVC/DOP blends were shown to be compatible in all proportions, and both T(E”$_{max}$) and T(tan${\delta}_{max}$) shifted to the lower temperature side as the DOP content increased. The vibration damping properties of wood/polymer composites were measured using the Rheovibron instrument in a bending mode. The composite damping factor(tan ${\delta}_{c}$) of wood /PVC-DOP/wood sandwich structure correlated with the loss factor and that of the coated structure correlated with the loss modulus(E”) of the polymer layer. In addition, the sandwich structure was found to be more effective in damping than the coated structure. The logarithmic decrement (${\Delta}$c) curve of a sandwich structure, which was determined by the free-free flexural vibration method was similar in shape to the tan ${\delta}_{c}$ curve.

  • PDF