• 제목/요약/키워드: JpL

검색결과 29건 처리시간 0.021초

고체 고분자 전해질(SPE)을 이용한 전기분해 공정에서 Rhodamine B 분해 (Degradation of Rhodamine B in Water using Solid Polymer Electrolyte (SPE) in the Electrolysis Process)

  • 박영식
    • 한국환경보건학회지
    • /
    • 제40권2호
    • /
    • pp.137-146
    • /
    • 2014
  • Objectives: Feasibility of electrochemical oxidation of the aqueous non-biodegradable wastewater such as cationic dye Rhodamine B (RhB) has been investigated in an electrochemical reactor with solid polymer electrolyte (SPE). Methods: Nafion 117 cationic exchange membrane as SPE has been used. Anode/Nafion/cathode sandwiches were constructed by sandwiching Nafion between two dimensionally stable anodes (JP202 electrode). Experiments were conducted to examine the effects of applied current (0.5~2.0 A), supporting electrolyte type (0.2 N NaCl, $Na_2SO_4$, and 1.0 g/L NaCl), initial RhB concentration (2.5~30.0 mg/L) on RhB and COD degradation and $UV_{254}$ absorbance. Results: Experimental results showed that an increase of applied current in electrolysis reaction with solid polymer electrolyte has resulted in the increase of RhB and $UV_{254}$ degradation. Performance for RhB degradation by electrolyte type was best with NaCl 0.2 N followed by SPE, and $Na_2SO_4$. However, the decrease of $UV_{254}$ absorbance of RhB was different from RhB degradation: SPE > NaCl 0.2 N > $Na_2SO_4$. RhB and $UV_{254}$ absorbance decreased linearly with time regardless of the initial concentration. The initial RhB and COD degradation in electrolysis reaction using SPE showed a pseudo-first order kinetics and rate constants were 0.0617 ($R^2=0.9843$) and 0.0216 ($R^2=0.9776$), respectively. Conclusions: Degradation of RhB in the electrochemical reactor with SPE can be achieved applying electrochemical oxidation. Supporting electrolyte has no positive effect on the final $UV_{254}$ absorbance and COD degradation. Mineralization of COD may take a relatively longer time than that of the RhB degradation.

Determination of triflusal in raw material and capsules by HPLC

  • Pham, Thuy-Vy;Mai, Xuan-Lan;Lee, Ji-Hyeon;Lee, Jong-Ha;Jo, Hyeon-Ah;Kang, Jong-Seong;Woo, Mi Hee;Na, Dong-Hee;Chun, In-Koo;Kim, Kyeong Ho
    • 분석과학
    • /
    • 제31권4호
    • /
    • pp.143-148
    • /
    • 2018
  • Currently, the Korean Pharmacopoeia (KP XI) recommends HPLC and potentiometric titration (which is less specific than HPLC) for the determination of triflusal content in capsules and raw materials, respectively. Additionally, the British Pharmacopoeia (BP 2017) and European Pharmacopoeia (EP 8.0), which include a monograph for triflusal in raw materials only, describe a titration method for the assay. The latest version of the United States Pharmacopoeia (USP 39) and Japanese Pharmacopoeia (JP 17) still have not published monographs for triflusal and its preparations. To improve the specificity and efficacy of the assay, we present an HPLC method to determine triflusal content in both raw materials and capsules. The proposed method was validated in accordance with the requirements of the International Conference on Harmonization. A good linear relationship was achieved for triflusal in the range of $200-1250{\mu}g/mL$ with a coefficient of determination of approximately 0.9996. The relative standard deviations (RSDs) of inter- and intraday precision were 0.73-1.12 % and 0.34-0.51 %, respectively. The recovery percentage of triflusal was in the range of 98.80-101.31 %. Because its system suitability, intermediate precision, and robustness were satisfactory, this method could be suitable for determining triflusal content in raw materials and capsules.

신용장 및 독립적 보증의 독립추상성 원칙 예외에 관한 고찰 - 근거계약의 위법을 중심으로 - (A Study on the Exceptions to Independence Principle of Documentary Credits and Autonomous Guarantees - with Special Emphasis on Illegality Exception -)

  • 한재필
    • 한국중재학회지:중재연구
    • /
    • 제19권3호
    • /
    • pp.179-198
    • /
    • 2009
  • This paper aims at assessing reasonableness for restraining the independence principle in the operation of documentary credit in case of the illegality appeared in the underlying transactions. It has been a major rule under the independence principle to keep the credit operation free from the defences made by the issuing bank and/or credit applicant with a view to prevent the payment as specified under the credit. And also, it is generally accepted in the international commercial community to examine a presentation to determine, on the basis of the document alone, whether or not the documents appear on their face to constitute a complying presentation. Even though these two essences are major rules in the credit operation, if a presentation is made with the documents forged or materially fraudulent, the issuing bank can refuse to pay the documents in respect of fraud rule based on fraud exception for which a court of appropriate jurisdiction would enjoin such honour. Now we have newly come to another situation to determine whether or not we have to apply the same as fraud rule which is applicable to the illegality in the underlying contract under the new conception of illegality principle based on illegality exception. English Commercial Court handled the illegality case under the case of Mahonia Ltd., v. JP Morgan Chase Bank in 2003 and Justice Colman decided that issuing bank can rely on illegality affecting a letter of credit as an excuse for failure to pay. This judgement brought about the acceptance of illegality principle based on illegality exception as a defence to payment under a letter of credit as far as the illegality concerned in the underlying transactions. It is noticeable that this case will affect our international commercial community more to rely on the illegality in the underlying transactions as a good issue to stop payment for the issuing bank in the L/C operation.

  • PDF

HYBRID LIGHT DUTY VEHICLES EVALUATION PROGRAM

  • Trigui, R.;Badin, F.;Jeanneret, B.;Harel, F.;Coquery, G.;Lallemand, R.;Ousten, JP.;Castagne, M.;Debest, M.;Gittard, E.;Vangraefshepe, F.;Morel, V.;Baghli, L.;Rezzoug, A.;Labbe, J.;Biscalia, S.
    • International Journal of Automotive Technology
    • /
    • 제4권2호
    • /
    • pp.65-75
    • /
    • 2003
  • A HEV evaluation program, funded by ADEME, was carried out by a group of Laboratories of different specialties in order to evaluate and compare consumption, emission and component technologies of the three first HEVs put on the market (Toyota Prius, Nissan Tino and Honda Insight). This paper presents the results obtained until now. These results show good consumption and emission performance of the tested vehicles compared to conventional ones. The energy management seems to be globally the same for the three vehicles excepting for cold stans where the Insight allows a very earlier stop of the engine compared to the Tino and especially to the Prius. A mapping of the engine consumption of the Prius and the Insight was performed in order to furnish data for the simulation models. The Permanent Magnet motors of the Prius and Tino have different number of pair poles and then different emf at a given speed. The low emf values of the Prius allow operation at high speed with less field weakening control than for the Tino. The inverters of the Prius and the Tino, controlled by a PWM at respectively 5 kHz and 7 kHz switching frequency, are made of IGBTs with high commutation performances.

염모제 종류와 시술 순서에 따른 모발의 물리적 형태와 색의 변화 (A Study on Variations in Physical Properties and Color of Hair depending on Dye Type and Perm, Hair Coloring Treatment Procedure)

  • 박용;권수애
    • 한국생활과학회지
    • /
    • 제16권5호
    • /
    • pp.1051-1059
    • /
    • 2007
  • This study intends to find out possible variations in physical properties and color of hair depending on dye type(acidic and alkalic) and permanent treatment/hair dyeing procedure. To meet the goals, healthy hair samples were taken from 5 women's hair speciment in 20's without experiencing in any harmful substance via long-term medications. and beauty care using chemicals. To get possible findings depending upon hair dye type and treatment procedure, both acidic and alkalic hair dye were applied on some specimens after permanent treatment, while on other specimens before permanent treatment. In order to determine scale damage, this study used SEM(Hitachi S-2500C) both hair thickness and tensile strength were measured with optical microscope(Nikon, MM-60/L3T) and Instron (4482-standard). Wave configuration was measured transverse and longitudinal round diameter. The chromaticity of each specimen was measured using a spectrocolorimeter(Color Techno System, JP/JX-777) with visual $C/2^{\circ}$ (at $2^{\circ}$ with C light source) monitor fixed to determine Lab and CMYK values. As a result, it was found that hair specimens were more significantly damaged with alkalic hair dye treatment than with acidic hair dye treatment, while hair specimens were more effectively dyed with the former hair dye type than with the latter one. For possible results depending on treatment procedure, it was found that hair specimens were less damaged but more effectively dyed with permanent treatment followed by hair dyeing than vice versa. Therefore, it was concluded that permanent treatment followed by acidic hair dyeing would be more effective in reducing hair damages.

주박(酒粕)에서 분리된 다당류의 대식세포 면역조절 활성 (Immuno-Modulatory Activities of Polysaccharides Separated from Jubak in Macrophage Cells)

  • 박우용;성낙윤;변의홍;오광훈;변명우;유영춘
    • 한국식품영양과학회지
    • /
    • 제44권7호
    • /
    • pp.1079-1083
    • /
    • 2015
  • 본 연구는 양조과정의 부산물인 주박으로부터 분리한 다당류(JPS)가 초기 면역반응에 중추적인 역할을 수행하는 대식세포에서 활성화를 유도하는지에 관한 여부를 알아보기 위해서 수행되었다. 주박에서 분리한 다당류를 마우스 유래 대식세포인 RAW264.7 cell에 처리하였을 때 대식세포의 활성화의 지표인 NO와 cytokine(IL-6, TNF-${\alpha}$)의 분비가 증가되었다. 또한 이러한 NO와 cytokine의 증가의 원인에 관한 면역기전에 관하여 알아본 결과 JPS의 처리는 MAPKs(ERK, JNK, p-38)의 인산화를 촉진시켜 NF-${\kappa}B$의 활성을 유도하여 면역세포의 활성인자들의 분비를 촉진시킨 것으로 관찰되었다.

품종별 청고추의 항산화 효과 및 유방암 세포주에서의 세포 사멸 연구 (Effects of Green Pepper (Capsicum annuum var.) on Antioxidant Activity and Induction of Apoptosis in Human Breast Cancer Cell Lines)

  • 윤효진;이슬;황인경
    • 한국식품과학회지
    • /
    • 제44권6호
    • /
    • pp.750-758
    • /
    • 2012
  • 본 연구에서는 국내외 품종별 green pepper에 있는 총 폴리페놀, 총 플라보노이드를 비롯하여 고추에 주로 함유된 flavonoids인 quercetin, luteolin, apigenin의 양을 측정하고, 이들로 인한 항산화 효과와 더불어 유방암 세포에서의 세포 증식 억제능을 측정하였다. 이에 국내산 green pepper의 flavonoids에 대한 기초 자료를 제공하고, 이들의 항산화 및 유방암을 비롯한 다양한 질병의 예방에 있어 잠재적인 가치를 알아보고자 하였다. 풋고추, 청양고추, 꽈리고추, 오이고추, 할라피뇨 5종의 기능성 성분으로 flavonoids 와 vitamin C 함량을 측정한 결과, 주요 플라보노이드는 luteolin, quercetin, apigenin 이었으며, 대부분의 고추에서 luteolin의 함량이 가장 높고, quercetin, apigenin의 순으로 함유되어 있었다. 5가지 품종의 고추 가운데 꽈리고추에서 luteolin, quercetin, apigenin의 함량이 유의적으로 가장 높게 나타났다. 비타민 C의 함량은 꽈리고추가 가장 높았으며, 청양고추, 할라피뇨, 풋고추, 오이고추의 순으로 나타났다. 5가지 품종의 green pepper에 함유된 총 폴리페놀의 양은 할라피뇨가 가장 높게 측정되었으며 다음으로 꽈리고추가 높은 함량이 측정되었으나, 품종간의 유의적이 차이는 나타나지 않았다. 총 플라보노이드의 함량은 꽈리고추가 유의적으로 가장 높게 측정되었고, 할라피뇨가 가장 적게 측정되었다. Green pepper 추출물의 DPPH, ABTS 자유기 소거 활성능을 측정한 결과, 농도에 따라 통계적으로 유의적인 효과를 보였다. 품종별로 살펴보면, 5가지 품종 중에서 꽈리고추의 소거 활성능이 모든 농도에서 가장 높은 결과를 나타내었다. Green pepper 추출물의 세포 증식 억제 효과를 측정하기 위하여 유방암 세포 MCF-7과 MDA-MB-231 세포를 사용한 결과, 두 세포에서 모두 농도 의존적으로 세포 증식 억제 효과가 있는 것을 확인할 수 있었다. 기능성 성분과 함께 라디칼 소거 활성능이 가장 좋았던 꽈리고추 추출물에서 가장 낮은 IC50 값(MCF-7: $826.07{\mu}g/mL$, MDA-MB-231: $719.58{\mu}g/mL$)을 나타내어 다른 품종에 비해 우수한 증식 억제효과를 보였다. 꽈리고추 추출물을 처리하여 유방암 세포주 MCF-7에서의 apoptosis 유도 단백질을 측정한 결과, Bax, cleaved caspase-3, PARP가 발현되어 꽈리고추 추출물이 apoptosis 형태의 세포 사멸을 유도하는 것을 확인하였다. 이상의 결과들을 종합하여 보면, green pepper에는 luteolin, quercetin, apigenin의 flavonoids를 비롯하여 vitamin C와 같은 기능성 성분과 페놀 화합물이 풍부하게 함유되어 있으며, 항산화 및 항암 효과가 있음을 확인하였다. 특히 꽈리고추는 5가지 품종의 green pepper 가운데 가장 우수한 항산화 및 항암능을 나타내었다. 또한 apoptosis 형태의 세포 사멸을 유도하는 것으로 보아 유방암의 치료 및 예방에 잠재적인 효과를 기대해 볼 수 있을 것이다. 하지만 in vitro 실험의 한계점이 있을 것으로 생각되며, in vivo에 대한 추가적인 연구가 이루어져야 할 것으로 사료된다.

직접 가열식 열탈착 공정을 이용한 유류오염토양의 정화 (Remediation of Petroleum-Contaminated Soil by a Directly-Heated Thermal Desorption Process)

  • 민형식;양인호;정상조;김한승
    • 한국지하수토양환경학회지:지하수토양환경
    • /
    • 제14권5호
    • /
    • pp.62-70
    • /
    • 2009
  • 본 연구에서는 lab-scale의 열탈착 장치를 설계 및 제작하고 실제 유류오염 토양을 대상으로 다양한 운전조건에 따른 오염토양정화성능을 비교하였다. 대상 토양은 군부대로 사용되던 부지 내 유류저장소 부근 고농도 오염토로 선정하였고, 10 L 용적의 원통형 batch 형태의 직접 가열식 열탈착기를 사용하여 초기 TPH 농도 4476 ppm의 고농도 오염 토양시료를 다양한 운전조건에서 열탈착하여 처리효율 분석을 수행하였다. 열중량 분석을 통해 열탈착 실험에서 대상 오염물질을 제거하기 위한 토양 시료의 평균 가열온도는 $200-300^{\circ}C$가 적합한 것으로 확인하였다. Batch 형식의 운전을 통한 처리효율 분석 결과 토양 내 오염물질을 90% 이상 제거하기 위해서는 약 $200^{\circ}C$에서는 10분, 약 $300^{\circ}C$에서는 5분 이상의 처리 시간이 요구되었다. 함수율이 높고 덩어리진 토양일수록 처리효율, 특히 고분자 오염물질의 처리효율이 크게 감소함을 보였다. 따라서 풍건을 통하여 오염토양 내 수분을 저하시킨 후 분쇄 처리하여 열탈착기에 주입하는 것이 효과적이라 판단된다. 또한 처리 전 토양과 처리 후 토양의 물리화학적 특성 비교한 결과 고온에 의해 증발된 수분함량을 제외하고 나머지 특성들은 거의 변화가 없어 실제 복원현장에서 오염토양을 열탈착 공정을 이용하여 오염물질을 제거한 후 추가적인 후처리 과정 없이 처리토양을 원래 위치에 복원하는 것이 가능함을 확인하였다. 본 연구결과는 현장운전에서 오염물질의 제거 효율을 극대화하기위한 인자 결정 및 검증을 위한 기초자료로 활용될 수 있을 것으로 사료된다.

프로테옴 해석에 의한 벼 게놈 기능해석과 응용 (Rice Proteomics: A Functional Analysis of the Rice Genome and Applications)

  • 우선희;김홍식;송범헌;이철원;박영목;정승근;조용구
    • Journal of Plant Biotechnology
    • /
    • 제30권3호
    • /
    • pp.281-291
    • /
    • 2003
  • In this review, we described the catalogues of the rice proteome which were constructed in our program, and functional characterization of some of these proteins was discussed. Mass-spectrometry is the most prevalent technique to rapidly identify a large number of proteome analysis. However, the conventional Western blotting/sequencing technique has been used in many laboratories. As a first step to efficiently construct protein cata-file in proteome analysis of major cereals, we have analyzed the N-terminal sequences of 100 rice embryo proteins and 70 wheat spike proteins separated by two-dimensional electrophoresis. Edman degradation revealed the N-terminal peptide sequences of only 31 rice proteins and 47 wheat proteins, suggesting that the rest of separated protein sports are N-terminally blocked. To efficiently determine the internal sequence of blocked proteins, we have developed a modified Cleveland peptide mapping method. Using this above method, the internal sequences of all blocked rice proteins(i, e., 69 proteins) were determined. Among these 100 rice proteins, thirty were proteins for which homologous sequence in the rice genome database could be identified. However, the rest of the proteins lacked homologous proteins. This appears to be consistent with the fact that about 45% of total rice cDNA have been deposited in the EMBL database. Also, the major proteins involved in the growth and development of rice can be identified using the proteome approach. Some of these proteins, including a calcium-binding protein that tuned out to be calreticulin, gibberellin-binding protein, which is ribulose-1.5-bisphosphate carboxylase/oxygense active in rice, and leginsulin-binding protein in soybean have functions in the signal transduction pathway. Proteomics is well suited not only to determine interaction between pairs of proteins, but also to identify multisubunit complexes. Currently, a protein-protein interaction database for plant proteins(http://genome.c.kanazawa-u.ac.jp/Y2H)could be a very useful tool for the plant research community. Also, the information thus obtained from the plant proteome would be helpful in predicting the function of the unknown proteins and would be useful be in the plant molecular breeding.