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Effect of Developmental Lead Exposure on the Expression of Hippocampal NMDA Receptor Subunit mRNA
Kim, Tae-Wan,Chung, In-Sung,Bae, Jae-Hoon,Shin, Dong-Hoon,Lee, Mi-Young,Kim, Joon-Sik 大韓産業醫學會 2005 대한직업환경의학회지 Vol.17 No.4
목적: in vivo 및 vitro에서 해마 신경세포의 발생단계별 NMDA 수용체 아단위 mRNA 발현에 대한 연 폭로 영향을 알아보고자 하였다. 방법: 흰쥐 해마 신경세포의 발생단계별 NMDA 수용체 NR2A, NR2B 아단위 mRNA 발현에 대한 연의 영향은 정상군과 연 폭로군의 출생 후 7일, 14일, 22일 흰쥐의 해마에서 in situ hybridization으로 mRNA 발현 정도를 densitometer로 측정하여 비교하였고, 연과 NMDA 의 세포독성은 해마 신경세포 일차배양 후 도립현미경을 이용한 형태학적인 관찰과 LDH 활성도를 이용하여 측정하였다. 결과: 연 과 NMDA 에 의한 세포독성에 대한 in vitro 실험에서 형태학적 소견과 LDH 활성도에서 해마 미성숙 신경세포와 성숙 신경세포사이의 차이가 있었으므로, 연과 NMDA 독성효과는 해마 신경세포의 발달 단계에 따라 차이가 있다. 정상군의 해마에서의 NR2A mRNA 발현은 출생 후 연령이 증가함에 따라 점진적으로 증가하였으나, NR2B mRNA 발현은 출생 후 연령이 증가함에 따라 점진적으로 증가하였으나 NR2B mRNA 발현은 연령의 증가에 따른 변화가 없었다. 연 폭로에 희한 NR2A mRNA 발현은 유의하게 감소하였으나(p<0.05), NR2B mRNA 발현은 변화가 나타나지 않았다. 만성적 연 폭로는 NR2A를 포함하는 NMDA 수용체를 감소시킬 수 있음을 알 수 있다. 결론: 연은 해마신경세포의 발생단계에서 NMDA 수용체 아단위 특히 NR2A mRNA 발현의 변화를 야기하여 시냅스 신호 전달에 영향을 나타냄을 알 수 있었다. Hippocampus
Shin, Changsik,Lee, Wonji,Lee, Se-Won,Lee, Sang-Han,Bang, Jun-Suk,Hong, Sung-Wan,Cho, Gyu-Hyeong IEEE 2018 IEEE transactions on power electronics Vol.33 No.8
<P>This paper presents a phase-cut dimmable ac–dc buck LED driver for electrolytic capacitor-less LED lighting applications. In the driver, the sine-reference band (SRB)-controlled average current technique is proposed to perform rectified sine-average current control and phase-cut dimming control. The rectified sine-average current control can regulate the average value of sine-wave LED current, maintaining a high power factor (PF) over a wide range of ac input voltage and output LED load. The phase-cut dimming control not only makes the LED driver compatible with two types of phase-cut dimmers, namely, leading-edge and trailing-edge dimming types, but also eliminates visible dimming flicker at the ac line frequency. Fabricated in a 0.35 <I>μ</I>m CMOS process, experimental results show the line regulation of ±2.36% over 90 to 260 V<SUB>AC</SUB> and the load regulation of ±0.65% within the load range of 10 to 36 LEDs. The PF exceeds 0.95 under all conditions, and the peak efficiency of 90.7% is achieved. The analysis of the flicker frequency verifies that the proposed dimmable LED driver completely eliminates visible flicker owing to the phase dimming variations without an output electrolytic capacitor.</P>
HIGH SPEED RESPONSE CONTROL SYSTEM FOR A VOLTAGE SOURCE INVERTER-FED INDUCTION MOTOR
SHIN SUNG-WAN,KIM KYOUNG-HWAN,SEO MYOUNG-SEOK 전력전자학회 1989 ICPE(ISPE)논문집 Vol.- No.-
A high performance Induction motor control has been developed by employing the vector control concept. To achieve instantaneous torque control of the Induction motor using vector control techniques, it is necessary that the transient slip frequency for a change In the torque command ( with a constant flux ) be compensated. This paper describes one control method to realize a fast response of a voltage source inverter-fed induction motor. We also introduce a new method of secondary flux weakening control that is effective for Low noise Induction motor drive.<br/>
Wan Kuen Jo,Sung Hoon Yang,Seung Ho Shin,Sung Bong Yang 대한환경공학회 2011 Environmental Engineering Research Vol.16 No.2
Limited information is available on the degradation of volatile hydrocarbons determined via the use of plate-inserted photocatalytic reactors. This has led to the evaluation of surface areas of cylindrical continuous-flow photocatalytic reactors for the degradation of three selected aromatic hydrocarbons. Three types of reactors were prepared: a double cylinder-type, a single cylindrical-type without plates and a single cylindrical-type with inserted glass tubes. According to diffuse reflectance, FTIR and X-ray diffraction (XRD) spectroscopy, the surface characteristics of a coated photocatalyst were very similar to those of raw TiO₂, thereby suggesting that the coated photocatalyst exhibited the same photocatalytic activity as the raw TiO₂. The photocatalytic degradation efficiencies were significantly or slightly higher for the single cylinder-type reactor than for the double cylinder-type reactor which had a greater catalytic surface area. However, for all target compounds, the degradation efficiencies increased gradually when the number of plates was increased. Accordingly, it was suggested that the surface area being enhanced for the plate-inserted reactor would elevate the photocatalytic degradation efficiency effectively. In addition, this study confirmed that both initial concentrations of target compounds and flow rates were important parameters for the photocatalytic removal mechanism of these plate-inserted photocatalytic reactors.
(Sung Gon Lee,(Jong Bum Kim,(Sun Hwa Ha,(Myung Chul Lee,(Wan Hye Ye,(Jang Yong Lee,(Shin Woo Lee,(Jung Bong Kim,(Kang Jin Cho,(Young Soo Hwang 한국응용생명화학회 2001 Journal of Applied Biological Chemistry (J. Appl. Vol.44 No.2
Pepper plants (Nogkwang, 60-day old) were inoculated with Phytophthora capsici to induce sesquiterpene cyclase associated with the biosynthesis of phytoalexin (capsidiol), a substance related to the defense against pathogens in plants. One day after inocul
Effect of Molecular Chaperones on the Soluble Expression of Alginate Lyase in E. coli
Shin, Eun-Jung,Park, So-Lim,Jeon, Sung-Jong,Lee, Jin-Woo,Kim, Young-Tae,Kim, Yeon-Hee,Nam, Soo-Wan The Korean Society for Biotechnology and Bioengine 2006 Biotechnology and Bioprocess Engineering Vol.11 No.5
When the alginate lyase gene (aly) from Pseudoalteromonas elyakovii was expressed in E. coli, most of the gene product was organized as aggregated insoluble particles known as inclusion bodies. To examine the effects of chaperones on soluble and nonaggregated form of alginate lyase in E. coli, we constructed plasm ids designed to permit the coexpression of aly and the DnaK/DnaJ/GrpE or GroEL/ES chaperones. The results indicate that coexpression of aly with the DnaK/DnaJ/GrpE chaperone together had a marked effect on the yield alginate lyase as a soluble and active form of the enzyme. It is speculated this result occurs through facilitation of the correct folding of the protein. The optimal concentration of L-arabinose required for the induction of the DnaK/DnaJ/GrpE chaperone was found to be 0.05mg/mL. An analysis of the protein bands on SDS-PAGE gel indicated that at least 37% of total alginate lyase was produced in the soluble fraction when the DnaK/DnaJ/GrpE chaperone was coexpressed.