• Title/Summary/Keyword: naphthalene

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Survival and Histological Changes in Gill of the Rockfish, Sebastes schlegeli Following Exposure to Naphthalene (나프탈렌에 노출된 조피볼락의 생존 및 아가미의 조직학적 변화)

  • Cho, Jae Kwon;Kim, Tae Ik;Son, Maeng Hyun;Kim, Kyong Min;Jin, Young Guk
    • Korean Journal of Ichthyology
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    • v.25 no.1
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    • pp.1-8
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    • 2013

  • Rockfish, Sebastes schlegeli (total length; $10.36{\pm}0.49cm$, total weight; $16.28{\pm}1.86g$, N; 290) were exposed to various concentrations of naphthalene for 28 days. Exposure concentrations of naphthalene established control, ethanol (solvent) control, 0.5, 1.0, 1.5 and 2.0 mg Nap $L^{-1}$. After exposure, We observed survival rate, and degree of tissue change (DTC) in gill under optical microscopy. Survival rate of the rockfish was more than 90% in control, ethanol control, 0.5 and 1.0 mg Nap $L^{-1}$, whereas it decreased in 1.5 and 2.0 mg Nap $L^{-1}$ (respectively 80%, 62.2%). In histological observation of gill, hyperplasia of epithelial cells observed in all exposure groups. But no showed increase of DTC which was related to concentration. Whereas, DTC at fusion of gill lamellar, lamellar telangiectasia, stasis, aneurysm and necrosis showed dose dependent increase. Especially, fusion of gill lamellar, lamellar telangiectasia and stasis observed at more 1.0 mg Nap $L^{-1}$, and aneurysm and necrosis at more 1.5 mg Nap $L^{-1}$. These results showed naphthalene caused survival and severe change to the gill of the rockfish which was related to exposure concentration.

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Local Heat Transfer Characteristics on Fin Surface of Plate Fin - Oval Tube with Delta Wing Vortex Generators (Plate fin-oval tube 열교환기에서 와류발생체에 의한 fin 표면에서의 국소 열전달 특성)

  • Shin, Seok-Won;Chung, In-Kee;Kim, Soo-Youn
    • Proceedings of the KSME Conference
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    • 2007.05b
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    • pp.2390-2395
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    • 2007

  • The present research was experimentally performed to analyze the effect of delta-wing vortex generators(DWVG) on the heat transfer of fin surface of the plate fin-oval tube. The local heat transfer coefficient of the fin surface for four kinds of DWVG's arrangement was measured by the naphthalene sublimation technique for Reynolds numbers ranging from 2000 to 3200. The results showed that the heat transfer of the plate fin-oval tube can be significantly enhanced by DWVG for relatively low Reynolds numbers.

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Evaluation of Physical Properties of Polymeric Material Containing Vinyl-Substituted Naphthalene and Anthracene for Ophthalmic Application (안의료용 렌즈 적용을 위한 Vinyl Group으로 치환된 Naphthalene 및 Anthracene을 포함하는 고분자 소재의 물성평가)