• 제목/요약/키워드: CD71

검색결과 195건 처리시간 0.026초

한강유역 주요지천의 저질내 중금속 분포 (Characteristics of Heavy Metal Distribution in Bottom Sdeiments of Tributaries of the Han River)

  • 허준무;박종안
    • 환경위생공학
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    • 제14권3호
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    • pp.71-79
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    • 1999
  • The Hg, Cd, Cu, Mn, and Zn in bottom sediments of han river and their tributaries were analyzed to evaluate the seasonal variations of heavy metals. Leaching tests were also performed for estimation of availability of heavy metal retention in sediments. Sediments of Anyang stream showed the highest concentration of heavy metal in the sediment samples. Heavy metal concentration was heavily depended upon the heavy metal source of tributaries of han river and particle distribution. Clay and silt had higher concentration of heavy metals than very fine san and fine sand due to difference of retention capability of heavy metal. The highest concentration of heavy metal was observed in bottom sediments irrespective of sites investigated. Heavy metals and ignition loss showed positive relations, and higher relationships with p-value <0.01 were observed between copper and lead. copper and zinc, and depended on the pH condition of leaching test, and leachated fraction increased with decrease of the pH.

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Characterization of Human Epidermal Stem Cells and Living Skin Equivalents

  • Kim, Dong-Seok;Youn, Sang-Woong;Choi, Hye-Ryung;Cho, Hyun-Ju;Jeon, Sang-Eun;Park, Kyoung-Chan
    • 대한약학회:학술대회논문집
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    • 대한약학회 2002년도 Proceedings of the Convention of the Pharmaceutical Society of Korea Vol.2
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    • pp.273.2-274
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    • 2002
  • Human epidermal keratinocytes consist of stem cells. transit amplifying cells. and postmitotic differentiating cells. Among them, stem cells playa critical role in cell renewal. wound healing. and neoplasia. However. till now, specific markers of human epidermal keratinocytes are not clearly defined. In the present study. we separated putative stem cells from other cells using fluorescence activated cell sorting (FACS). based on differences in a6-integrin and CD71 expression. (omitted)

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휴/폐광 광산폐기물의 지구화학적 특성 (Geochemical Characteristics of Mine Wastes in Abandoned Mines in Korea)

  • 정명채;정영욱;민정식
    • 한국지하수토양환경학회:학술대회논문집
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    • 한국지하수토양환경학회 1998년도 공동 심포지엄 및 추계학술발표회
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    • pp.71-75
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    • 1998
  • The objective of this study is to investigate geochemical characteristics of mine wastes including tailings in various abandoned mines in Korea. Tailings and wastes were sampled in and around 39 metalliferous mines, and analysed heavy metal concentrations including Cd, Cu, Pb and Zn extracted by 0.1N HCl and aqua regia by Atomic Absorption Spectrometry. Measurements of paste pH and lime requirement were carried out to examine a general geochemical characteristics of the materials. Lots of mine wastes were characterized by very low pH values of 2 to 4 and high lime requirement to control neutralization of the wastes. In addition, elevated levels of heavy metals were found in various mine wastes extracted by both 0.lN HCl and aqua regia. Because the mine wastes can be dispersed into the downstream by clastic movement and wind-blow, it is necessary to control the materials with a proper method for their reclamation.

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제지 사업장 소각시설에서 입자상물질 및 중금속의 배출특성

  • 양수명;정두호;박정호;전보경
    • 한국환경과학회:학술대회논문집
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    • 한국환경과학회 2006년도 학술발표회 발표논문집
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    • pp.103-104
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    • 2006
  • 고체연료 성상별 연소시 굴뚝에서 배출되는 입자상물질의 농도는 섬유류(86.8mg/m$^3$) > PP 마대류(26.51mg/m$^3$) > 합성수지류(16.71mg/m$^3$) > 우레탄(11.17mg/m$^3$) > 목재류(10.92mg/m$^3$) > 종이류(2.61mg/m$^3$)의 순으로 나타났다. 특히 폐섬유 소각시 입자상물질 중 중금속 함유농도는 Pb의 경우 기타 고체연료 연소시 함유농도비가 0.4% 이하인 반면에 폐섬유 소각시 6.6%인 5.72mg/m$^3$로 높게 나타났으며, Cd 또한 1.4%인 1.24mg/m$^3$로 높게 나타났다.

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사각덕트내의 유체유동에 관한 수치계산과 실험의 비교 (The comparison between Numerical Computation and Experiment on Fluid Elow in Rectangular Duct)

  • 윤영환;배택희;박원구
    • 대한기계학회:학술대회논문집
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    • 대한기계학회 2002년도 학술대회지
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    • pp.71-74
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    • 2002
  • Fluid flow in a rectangular duct system are measured by W laser doppler velocity meter, and also computed by commercial software of STAR-CD for comparison between then First, for a rectangular duct with 90 degree metered elbow, the fluid flow with Reynolds numbs's of 1,508 is predicted by assumption of both laminar and turbulent models. But, even though the Reynolds number is less than 2,300-3,000, the computation by turbulent model is close to the experimental data. Moeover, the computation by turbulent model for Reynolds number of 11,751 also predicts the experimental data satisfactorily. Second, for a rectangular duct with two branch ducts, the ratios between flow rates in the two branches are invariant to Reynolds number according to both of numerical and experimental results.

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Study on Anharmonic Effect of the Unimolecular Reaction of CH2(D2)FO

  • Zhong, Jingjun;Li, Qian;Luo, Ji;Xia, Wenwen;Yao, Li;Lin, S.H.
    • Bulletin of the Korean Chemical Society
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    • 제35권12호
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    • pp.3559-3566
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    • 2014
  • Study on the unimolecular reaction for $CH_2FO$ and $CD_2FO$ is carried out. The structures, energy barriers and zero point energy of the three channels in the title unimolecular reactions are computed with the MP2/6-311++G(3df, 3pd) method. RRKM theory is used to calculate the rate constants of canonical case at temperature range of 500-5000 K and microcanonical system at total energy of 19.05-71.68 kcal/mol. The results indicate that the anharmonic effect and isotope effect are very small for the three channels, and the anharmonic rate constants, around $10^9-10^{11}s^{-1}$, are close to the experimental prediction reasonably.

Highly Efficient Simple-Structure Red Phosphorescent OLEDs with an Extremely Low Doping Technology

  • Jeon, Woo-Sik;Park, Tae-Jin;Kwon, Jang-Hyuk
    • Journal of Information Display
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    • 제10권2호
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    • pp.87-91
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    • 2009
  • Highly efficient red phosphorescent OLEDs (PHOLEDs) with a simple, organic, triple-layer structure was developed using the narrow-bandgap fluorescent host material bis(10-hydroxybenzo[h] quinolinato)beryllium complex (Bebq2) and the deep-red dopant tris(1-phenylisoquinoline)iridium (Ir(piq)3). The maximum current and power efficiency values of 12.71 cd/A and 16.02 lm/W, respectively, with an extremely low doping technology of 1%, are demonstrated herein. The results reveal a practical, cost-saving host dopant system for the fabrication of highly efficient PHOLEDs involving the simple structure presented herein, with a reduction of expensive Ir dopants.

한국에 분포하는 한약자원식물의 무기물 함량에 관한 연구 제 2 보 ( The Mineral Content of Medical Wild Plant Resources in Korea ( II ) )

  • 이상래
    • 한국자원식물학회지
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    • 제3권2호
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    • pp.115-121
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    • 1990
  • In view of the results to have measured metallic elements which is included in 40 sorts of herb medicines and surveyed their distribution, ninekinds of metals including Co, Ce, Ga, 71, Cd, As, Sbr Bu. Pb, are never orlittle included in almost herb medicines. Other twenty four sorts of ele-ments (Mo, Sc, Be, V, Ni, Su, Se, Ba, Cr, Su, Ti, B, Li, Mg, Ca, Sr, Mnl Fe,Cu, Zn. p, Al, Na, K) are metals that are included in large quentities incomparison with others. Selagirellae Radix contains is kinds of metallicelements more then other herb medicines does. The content of elements ofinorganic metal differs greatly according to the part of herb medicines .

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한국 연안산 해산 무척추동물의 중금속 함량 (Contents of Heavy Metals in Marine Invertebrates from the Korean Coast)

  • 목종수;이가정;심길보;이태식;송기철;김지회
    • 한국식품영양과학회지
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    • 제39권6호
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    • pp.894-901
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    • 2010
  • 본 연구에서는 2003년부터 2004년까지 동해, 서해 및 남해 연안에서 채취하여 위판장에서 판매되고 있는 연안산 패류(복족류 및 이매패류), 두족류, 갑각류 등의 해산무척추동물 52종 239개체에 대한 중금속 함량을 분석하였다. 인증표준물질(certified reference material, CRM)을 사용한 각 중금속에 대한 회수율은 평균 86.3~104.6%로 Codex에서 요구하고 있는 수준에 부합하였다. 우리나라 연안산 복족류의 중금속 함량은 아연 $21.471{\pm}10.794\;{\mu}g/g$, 구리 $4.115{\pm}2.565\;{\mu}g/g$, 망간 $0.868{\pm}0.593\;{\mu}g/g$, 니켈 $0.254{\pm}0.418\;{\mu}g/g$, 납 $0.238{\pm}0.220\;{\mu}g/g$, 카드뮴 $0.154{\pm}0.170\;{\mu}g/g$, 크롬 $0.110{\pm}0.082\;{\mu}g/g$ 순이었고, 이매패류의 경우는 아연 $35.655{\pm}46.978\;{\mu}g$, 망간 $5.500{\pm}9.943\;{\mu}g$, 구리 $3.129{\pm}5.979\;{\mu}g$, 카드뮴 $0.423{\pm}0.345\;{\mu}g/g$, 니켈 $0.402{\pm}0.379\;{\mu}g$, 크롬 $0.233{\pm}0.234\;{\mu}g/g$, 납 $0.232{\pm}0.216\;{\mu}g/g$ 순이었다. 또한, 두족류는 아연 $18.380{\pm}5.479\;{\mu}g/g$으로 가장 높았으며, 다음으로 구리 $3.594{\pm}1.823\;{\mu}g/g$, 망간 $0.630{\mu}g0.630\;{\mu}g$, 크롬 $0.150\;{\pm}0.115\;{\mu}g/g$, 납 $0.068{\pm}0.066\;{\mu}g/g$, 카드뮴 $0.034\;{\mu}g{\pm}0.046\;{\mu}g/g$, 니켈 $0.030{\pm}0.047\;{\mu}g/g$ 순이었고, 갑각류의 경우 아연 $25.333{\pm}9.608\;{\mu}g/g$으로 가장 높았으며, 다음으로 구리 $9.042{\pm}8.895\;{\mu}g/g$, 망간 $0.659{\pm}0.412\;{\mu}g/g$, 크롬 $0.592{\pm}2.172\;{\mu}g/g$, 카드뮴 $0.207{\pm}0.204\;{\mu}g/g$, 납 $0.126{\pm}0.094\;{\mu}g/g$, 니켈 $0.094{\pm}0.110\;{\mu}g/g$ 순이었다. 따라서 카드뮴, 납 등 유해 중금속의 함량은 이매패류>갑각류=복족류>두족류 순으로 높게 함유하고 있는 것으로 나타났다. 한편, 우리나라 국민의 수산물을 통한 중금속의 1일 섭취량은 각각 카드뮴 $6.88\;{\mu}g$, 크롬 $19.13\;{\mu}g$, 구리 $137.02\;{\mu}g$, 망간 $156.13\;{\mu}g$, 니켈 $11.39\;{\mu}g$, 납 $7.01\;{\mu}g$ 및 아연 $1,025.94 {\mu}g$이었다. 이는 FAO/WHO에서 설정한 잠정주간섭취허용량인 PTWI와 비교해 보면, 카드뮴의 11.47%, 구리의 0.46%, 납의 3.27% 및 아연의 1.71% 수준이었다. 따라서 우리국민이 수산물을 통하여 섭취하는 카드뮴 및 납 등 유해 중금속 함량은 매우 안전한 수준인 것으로 판단된다.

Adsorption of Heavy Metal Ions onto Chemically Oxidized Ceiba pentandra (L.) Gaertn. (Kapok) Fibers

  • Chung, Byung-Yeoup;Cho, Jae-Young;Lee, Min-Hee;Wi, Seung-Gon;Kim, Jin-Hong;Kim, Jae-Sung;Kang, Phil-Hyun;Nho, Young-Chang
    • Journal of Applied Biological Chemistry
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    • 제51권1호
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    • pp.28-35
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    • 2008
  • The physico-chemical properties of kapok fibers were altered via the combination processes of chlorite-periodate oxidation, in order to assess their efficacy as a heavy metal adsorbent. The chemically-oxidized kapok fibers were found to harbor a certain amount of polysaccharides, together with lowered lignin content. This alteration in lignin characteristics was clearly confirmed via FTIR and NBO yield. Moreover, chemically oxidized kapok fibers retained their hollow tube shape, although some changes were noted. The chemically oxidized kapok fibers evidenced elevated ability to adsorb heavy metal ions with the best fit for the Langmuir adsorption isotherm model. Three cycles of adsorption-desorption were conducted with in-between regeneration steps. Our experimental results indicated that chemically oxidized kapok fibers possessed excellent adsorption characteristics, and the modified kapok fibers could be completely regenerated with almost equimolar diluted sodium hydroxide. Pb, Cu, Cd and Zn ions evidenced adsorption rates of 93.55%, 91.83%, 89.75%, and 92.85% on the chemically oxidized kapok fibers. The regeneration efficiency showed 73.58% of Pb, 71.55% of Cu, 66.87% of Cd, and 75.00% of Zn for 3rd cycle with 0.0125N NaOH.