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시판되고 있는 까칠복(Fugu stictonotus)의 독성
김경찬,박진우,이명자,김상록,김동수,김현대,박영호,KIM Kyung-Chan,PARK Jin-Woo,LEE Myung-Ja,KIM Sang-Rok,KIM Dong-Soo,KIM Hyun-Dae,PARK Yeung-Ho 한국수산과학회 1995 한국수산과학회지 Vol.28 No.1
Ten specimens (5 males and 5 females) of the pufferfish, fugu stictonotus ('gachilbog'), were collected at a fish market of Pusan, Korea in July 1993, and examined for anatomical distribution of toxicity by mouse assay method. The frequency of toxic specimens was $40\%\;for\;liver,\;60\%$ for ovary, $40\%\;for\;skin\;and\;60\%$ for bile in female puffers. The highest toxicities were 107, 107, 29 and 93MU/g for liver, ovary, skin and bile, respectively; and average toxicity $\pm S.E.\;values\;were\;14\pm11,\;48\pm22.4\pm3\;and\;12\pm9MU/g,$ respectively. The range of total toxicity was shown to be from 0 to 35,316MU. The characteristic pattern of toxin distribution observed on these specimens was exhibited; both muscle and testis were non-toxic, but others were weakly toxic. Also, there was significant difference for toxicity between male and female specimens. 본 연구에서는 시판되고 있는 까칠복을 시료로 하여 개체별 부위별에 따른 독성을 조사하고, 북구주산 및 삼릉산 까칠복과의 지역차 및 개체차를 비교 검토하였다. 간장의 경우에 있어서는 수컷은 전 개체가 무독하였으나, 암컷은 유독 개체 출현율이 $40\%$ (2/5), 최고 독성치는 107MU/g이었다. 난소의 경우는 유독 개체 출현율이 $60\%$ (3/5), 최고독성치는 109MU/g이었다. 근육과 정소의 경우는 전 개체가 무독하였다. 껍질의 경우는 수컷의 전 개체가 무독하였으나, 암컷의 경우는 유독 개체 출현율이 $40\%$ (2/5), 최고독성치가 29MU/g이었다. 담즙의 경우는 수컷은 무독하였으나, 암컷의 경우는 유독 개체 출현율이 $60\%$ (3/5), 최고 독성치는 93MU/g이었다. 이러한 결과들은 북구주산의 까칠복보다는 독성차가 다소 높게 나타났으나, 삼릉산의 것에 비하여는 독성치가 다소 낮게 검출되어, 동일 종일지라도 지역차, 개체차 및 성별차가 현저함을 알 수 있었다.
자기-도핑형 poly(PEGMA-co-BF<sub>3</sub>LiMA) 전해질의 합성과 이온전도도에 대한 PEGMA분자량의 영향
김경찬,류상욱,Kim, Kyung-Chan,Ryu, Sang-Woog 한국전기화학회 2012 한국전기화학회지 Vol.15 No.4
분자량이 각각 300(PEGMA300) 및 1100(PEGMA1100) g $mol^{-1}$인 PEGMA와 합성된 $BF_3LiMA$ 리튬염을 이용하여 다양한 조성의 고분자전해질을 제조하고 전기화학적 특성을 평가하였다. 흥미롭게도 AC-impedance 측정법에 의한 상온 이온전도도는 분자량 $300g\;mol^{-1}$로 합성된 액체 고분자전해질에서 $8.54{\times}10^{-7}S\;cm^{-1}$의 값이 얻어진 반면, PEGMA1100으로 합성된 고체상태의 고분자전해질에서 최대 14배 이상 높은 $1.22{\times}10^{-5}S\;cm^{-1}$가 관찰되었다. 이러한 결과는 PEGMA에 ethylene oxide 단위가 5개인 $300g\;mol^{-1}$보다 23개인 $1100g\;mol^{-1}$에서 리튬이온의 배위가 쉽게 일어나기 때문으로 해석된다. 또한 양이온 수율 측정결과 리튬메탈과 $BF_3$간의 반응으로 인해 0.6의 비교적 낮은 값이 나왔지만 초기 3000초 동안에는 0.9 이상의 값이 관찰되어 단일이온 전도체의 특징을 보여주었다. Polymer electrolytes consisted of $BF_3LiMA$ and 300 (PEGMA300) or 1100 (PEGMA1100) g $mol^{-1}$ of PEGMA were prepared and the electrochemical properties were characterized. Interestingly, the AC-impedance measurement shows $1.22{\times}10^{-5}S\;cm^{-1}$ of room temperature ionic conductivity from PEGMA1100 based solid polymer electrolytes while $8.54{\times}10^{-7}S\;cm^{-1}$ was observed in PEGMA300 based liquid polymer electrolytes. The more suitable coordination between lithium ion and ethylene oxide (EO) unit might be the reason of higher ionic conductivity which can be possible in PEGMA1100 based electrolytes since it has 23 EO units in monomer. The lithium ion transference number was found to be 0.6 due to the side reactions between $BF_3$ and lithium metal expecially for longer time but 0.9 was observed within 3000 seconds of measuring time which is strong evidence of a single-ion conductor.
BF<sub>3</sub>LiMA를 단량체로 하는 고체 고분자전해질 합성과 전기화학적 특성
김경찬,류상욱,Kim, Kyung-Chan,Ryu, Sang-Woog 한국전기화학회 2011 한국전기화학회지 Vol.14 No.4
합성된 $BF_3LiMA$ 리튬염을 단량체로 사용하는 고체 고분자전해질을 제조하고 $BF_3LiMA$의 농도가 이온전도도에 미치는 영향 및 전기화학적 안정성을 교류임피던스 측정법과 선형전위주사법을 통하여 평가하였다. 그 결과 $BF_3LiMA$가 12.9 wt%인 고체 고분자전해질에서 $7.71{\times}10^{-6}S\;cm^{-1}$의 가장 높은 $25^{\circ}C$ 이온전도도가 관찰되었으며 이 값을 전후로 이온전도도는 다소 감소하는 경향이 나타났다. 이러한 결과는 저농도의 $BF_3LiMA$에서 발생할 수 있는 리튬염의 부족과 고농도의 $BF_3LiMA$에서는 발생할 수 있는 고분자기질의 유동성 감소가 원인으로 해석된다. 또한 $BF_3LiMA$ 기반의 고체 고분자전해질은 음이온이 고정되어 있는 자기-도핑형 계열로서 $60^{\circ}C$에서 6.0 V까지 우수한 전기화학적 안정성을 보여주었다. Solid polymer electrolytes using $BF_3LiMA$ as monomer were synthesized by usual one step radical polymerization in THF solvent. The effect of $BF_3LiMA$ concentration on ionic conductivity and electrochemical stability was investigated by AC impedance measurement and linear sweep voltammetry. As a result, the highest ionic conductivity reached $7.71{\times}10^{-6}S\;cm^{-1}$ at $25^{\circ}C$ was obtained in 12.9 wt% of $BF_3LiMA$ content. Further increase or decrease of $BF_3LiMA$ content result to decrease the ionic conductivity due to the brittle matrix properties in former case and the insufficient number of charge carrier in the latter case. Furthermore, since the counter-anion was immobilized in the self-doped solid polymer electrolytes, high electrochemical stability up to 6.0 V was observed even in $60^{\circ}C$.
HL-60 세포에서 $TNF-{\alpha}$에 의한 MCP-1 발현에 미치는 Betulinic Acid의 효과
김경찬,이추희,Kim, Kyung-Chan,Lee, Chu-Hee 대한약학회 2008 약학회지 Vol.52 No.1
Betulinic acid, a naturally occurring pentacyclic triterpenoid, is found in abundance in the outer bark of white birch (Betula alba). In this study, we investigated if betulinic acid affects cytokine expression from activated macrophage cells. ELISA result showed that stimulation of HL-60 cells with proinflammatory cytokine such as $TNF-{\alpha}$ resulted in MCP-1 release into culture medium. In addition, transcriptional upregulation of MCP-1 in response to $TNF-{\alpha}$ was observed by RT-PCR analysis. However, incubation of HL-60 cells with betulinic acid prior to $TNF-{\alpha}$ treatment abrogated MCP-1 expression in transcription and translational level. Consistent with a number of studies which reported requirement of ERK activation for $TNF-{\alpha}$ expression, Western blot analysis showed that $TNF-{\alpha}-induced$ ERK activation was suppressed by pretreatment of HL-60 cells with betulinic acid. Taken together, our data indicate that betulinic acid exerts its anti-inflammatory effect through inhibition of $TNF-{\alpha}-induced$ ERK activation which is required for the subsequent MCP-1 release.
김경찬,김수현,곽윤근,Kim, Kyung-Chan,Kim, Soo-Hyun,Kwak, Yoon-Keun 대한기계학회 1998 大韓機械學會論文集A Vol.22 No.2
A new 6 degrees-of-freedom micro stage, based on parallel mechanisms and actuated by using piezoelectric elements, has been developed for the application of micro positioning such as semiconductor manufacturing devices, high precision optical measurement systems, and high accurate machining. The micro stage structure consists of a base platform and an upper platform(stage). The base platform can effectively generates planar motion with yaw motion, while the stage can do vertical motion with roll and pitch motions with respect to the base platform. This separated structure has an advantage of less interference among actuators. The forward and inverse kinematics of the micro stage are discussed. Also, through linearization of kinematic equations about an operating point on the assumption that the configuration of the micro stage remains essentially constant throughout a workspace is performed. To maximize the workspace of the stage relative to fixed frame, an optimal design procedure of geometric parameter is shown. Hardware description and a prototype are presented. The prototype is about 150mm in height and its base platform is approximately 94mm in diameter. The workspace of the prototype is obtained by computer simulation. Kinematic calibration procedure of the micro stage and its results are presented.
543 nm 헬륨네온 레이저의 주파수 안정화를 위한 I<SUB>2</SUB> 포화흡수분광
김경찬(Kim, Kyung-Chan),엄년식(Eum, Nyeon-Sik),홍주현(Hong, Joo-Hyun),서호성(Seo, Ho-Sung) 한국산학기술학회 2010 한국산학기술학회논문지 Vol.11 No.3
본 연구는 543 nm 헬륨네온 레이저의 주파수 안정화를 위한 <SUP>127</SUP>I2 포화흡수분광 장치의 설계와 제작에 관한 것이다. 온도와 PZT 변화에 의한 레이저관 길이 가변을 이용하여 543 nm 헬륨네온 레이저의 주파수를 주사시켰다. 3 차 고조파 신호을 얻기 위해 PZT 변조 가능한 레이저 출력경을 이용하여 주파수 변조를 하였다. 그 결과, <SUP>127</SUP>I2 용 B-X 시스템의 R(12) 26-0에서 R(106) 28-0의 천이를 가지는 초미세구조 분광은 포화흡수분광기를 사용한 3차 미분 신호에서 관찰되었다. 또한, 전형적인 초미세구조 분광 신호의 신호대 잡음비는 약 30:1 로 얻어졌다. We have designed and assembled a saturated absorption-spectroscopy system of <SUP>127</SUP>I2 for the frequency stabilization of the 543 nm He-Ne laser. The frequency of a internal-mirror 543 nm He-Ne laser was swept by utilizing the temperature and PZT change of the laser cavity length. Frequency modulation was applied to the output laser mirror with a PZT modulator for the third harmonic signal. A portion of the hyperfine spectrum originated from the R(12)26-0 and R(106)28-0 transitions of the B-X system of <SUP>127</SUP>I2 was observed as the third-derivative signal using a saturated absorption spectroscopy. The signal-to-noise ratio of a typical hyperfine spectrum signal was estimated to be 30:1.
Churg-Strauss 증후군에 동반된 Wells` Syndrome
김경찬 ( Kyung Chan Kim ),정현 ( Hyun Chung ),박준수 ( Joon Soo Park ),박재복 ( Jae Bok Park ),최정윤 ( Jung Yoon Choe ),박성훈 ( Sung Hoon Park ),김지영 ( Ji Young Kim ),김성규 ( Seong Kyu Kim ) 대한류마티스학회 2008 대한류마티스학회지 Vol.15 No.1
Wells` syndrome is an inflammatory dermatosis with associated aberrant eosinophil responses caused by unknown factors. Its histology is characterized by erythematous plaques with flame figures in the dermis, which is potentially diagnostic but not pathognomic. Cases of Wells` syndrome in patients with Churg-Strauss syndrome (CSS), which is characterized by antineutrophil cytoplasmic antibody-related necrotizing vasculitis, marked peripheral eosinophilia, and eosinophil tissue infiltrates, have rarely been reported, and the pathogenic association between these two diseases remains undetermined. Differences of clinical and histopathologic features of these two diseases suggest that they are distinct disease entities, even though, in part, they share pathogenic mechanisms. Here we present a new case with Wells` syndrome in a patient with CSS, treated with systemic steroid.