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Hong, Seok Bok,Jeong, Jae-Min,Kang, Heon Gyu,Seo, Donghyuk,Cha, Younghyun,Jeon, Hyeonyeol,Lee, Geun Young,Irshad, Mobina,Kim, Do Hyun,Hwang, Sung Yeon,Kim, Jung Won,Choi, Bong Gill American Chemical Society 2018 ACS APPLIED MATERIALS & INTERFACES Vol.10 No.41
<P>The integration of metal oxides and carbon materials provides a great potential for enhancing the high energy and power densities of supercapacitors, but the rational design and scalable fabrication of such composite materials still remain a challenge. Herein, we report a fast, scalable, and one-pot hydrodynamic synthesis for preparing ion conductive and defect-free graphene from graphite and MnO<SUB>2</SUB>/graphene nanocomposites. The use of this hydrodynamic method using Taylor-Couette flow allows us to efficiently fast shear-exfoliate graphite into large quantities of high-quality graphene sheets. Deposition of MnO<SUB>2</SUB> on graphene is subsequently performed in a fluidic reactor within 10 min. The prepared MnO<SUB>2</SUB>/graphene nanocomposite shows outstanding electrochemical performances, such as a high specific capacitance of 679 F/g at 25 mV/s, a high rate capability of 74.7% retention at an extremely high rate of 1000 mV/s, and an excellent cycling characteristic (∼94.7% retention over 20 000 cycles). An asymmetric supercapacitor device is fabricated by assembling an anode of graphene and a cathode of MnO<SUB>2</SUB>/graphene, which resulted in high energy (35.2 W h/kg) and power (7.4 kW/kg) densities (accounting for the mass of both electrodes and the electrolyte) with a high rate capability and long cycle life.</P> [FIG OMISSION]</BR>
Fast Fabrication of Sub-200-nm Nanogrooves Using Liquid Crystal Material
Kim, Dae Seok,Cha, Yun Jeong,Gim, Min-Jun,Yoon, Dong Ki American Chemical Society 2016 ACS APPLIED MATERIALS & INTERFACES Vol.8 No.18
<P>Self-assembly of soft materials attracts keen interest for patterning applications owing to its ease and spontaneous behavior. We report the fabrication of nano grooves using sublimation and recondensation of liquid crystal (LC) materials. First, well-aligned smectic LC structures are obtained on the micron-scale topographic patterns of the microchannel; then, the sublimation and recondensation process directly produces nanogrooves having sub-200-nm scale: The entire process can be completed in less than 30 min. After it is replicated using an ultraviolet-curable polymer, our platform can be used as an alignment layer to control other guest LC materials.</P>
Pseudomonas stain HK-6에 의한 폭발물 RDX(Hexahydro-1,3,5-Trinitro-1,3,5-Triazine)의 생분해
정관구,차민석,오계헌 순천향대학교 기초과학연구소 2000 순천향자연과학연구 논문집 Vol.6 No.2
The feasibility using an isolate derived from the enriched microbial consortium for explosive degradation was explored. The present study reports on the isolate which was developed to grow aerobically with RDX (hesahydro-1,3,5-trinitro-1,3,5-triazine) as the sole sources of carbon and nitrogen. Complete depletion of RDX a the initial concentration of 15 mg per liter was achieved within 24 days of incubation in bench-scale bioreactors. Addition of supplemental carbons (e.g., succinate, glucose, fructose) stimulated the degradation of RDX. The isolate also could degrade structurally related explosive 2,4,6-trinitrotoluene. Degradation of RDX was verified by HPLC analysis of the residual RDX concentration in the test culture. Microscopic examination of this degrader, HK-6 revealed a Gram-negative and coccobacillus shaped cell. Strain HK-6 was characterized by using the Biolog system and an analysis of the total cellular fatty acids. The strain indicated that the bacterium could be identified and designated as pseudomonas putida HK-6
페녹시계 제초제 MCPA를 분해하는 토양세균의 분리 및 특성 연구
김영진,차민석,오계헌,고준경,김영훈 순천향대학교 기초과학연구소 1997 순천향자연과학연구 논문집 Vol.3 No.1
A pure culture that can utilize 4-chloro-2-methylphenoxyacetic acid(MCPA) as a sole carbon and energy source was isolated from soil samples. Initially, clear zone formation on thin-layered MCPA agar plates was observed around spot inoculum of the isolate. As the results of various physiological and biochemical tests, the isolate was identified as Pseudomonas aeruginosa. The bacterium was able to degrade MCPA(300㎎/L) completely within 7 days of incubation as determined by UV-spectrophotometric analysis.
최원식,차민석,오계헌 순천향대학교 기초과학연구소 1997 순천향자연과학연구 논문집 Vol.3 No.1
Microbial consortia were screened for their ability to degrade resole at the sole carbon source. Five microbial consortia were derived from a plant site where a biological treatment of liqid waste stream of a manufacturing facility was located. Among the consortia, the test consortium, designated as MS2, displayed approximately 70% degradation of the substrate, 0.1 g of resole per liter, within the first twelve days of incubation but the degradation did not proceed to completion. pH was decreased and resole degradation was inhibited under the conditions. UV-spectroscopy was used quantitatively to monitor the residual concentrations of resole in the present work. UV-scans of spent culture showed that wavelength of maximum absorption was 216nm for resole.
서울의 Penicillinase Producing Neisseria Gonorrhoeae 발생빈도(1996)
김재홍,황동규,전재홍,김윤석,김중환,김용준,이창균,임동진,김현수,조창근,김경문,박상훈,전우형,김희성,이호정,차명수,김갑형,김형석,김석우,황지환,박병순,권오상,이민수,송기훈,성소영,이인섭,부태성 대한화학요법학회 1999 대한화학요법학회지 Vol.17 No.2
Background : In recent years, gonorrhea has been panedemic and remains one of the most commom STDs in the world, especially in developing countries. Objective & Methods: For the detection of a more effective therapeutic regimen and assessing the prevalence of PPNG, we have been trying to study the patients who have visited the VD Clinic of Choong-Ku Public Health Center in Seoul since 1980 by means of the chromogenic cephalosporin method. Results: In 1996, 139 strains of N. gonorrhoeae were isolated, among which 53(39.0%) were PPNG. Conclusion: Our results suggests that after a peak of 74.3% in 1993, the prevalence of PPNG in Seoul is gradually declining.
무릎 관절경 수술 시 Fentanyl 투여가 압박띠 사용에 따른 혈역학적 변화에 미치는 영향
이윤숙 ( Yoon Sook Lee ),김재환 ( Jae Hwan Kim ),차문호 ( Moon Ho Cha ),민두재 ( Doo Jae Min ),김운영 ( Woon Young Kim ),장문석 ( Moon Seok Chang ),박영철 ( Young Cheol Park ) 대한마취과학회 2009 Korean Journal of Anesthesiology Vol.56 No.1
Background: The use of a tourniquet can produce pain and increase in blood pressure. It is known that fentanyl reduces central sensitization, however its effect on blood pressure increase due to tourniquet is unknown. So we investigated the effect of fentanyl on tourniquet-induced changes of mean arterial blood pressure (MBP), heart rate (HR), and cardiac index (CI). Methods: ASA physical status I and II, who were scheduled for knee arthroscopic surgery using a tourniquet, were assigned into control (n=30) and fentanyl group (n=30). Anesthesia was maintained with enflurane, N2O and O2. Fentanyl was injected 1.5 ug/kg at 10 min before inflation of the tourniquet in the fentanyl group. Changes of the MBP, HR, CI were measured before and 10, 20, 30, 40, 50, 60 min after inflation of the tourniquet. Results: There were no differences in the baseline values. MBP was increased at 40, 50, 60 min in the control group. At 60 min, MBP was lower in the fentanyl than the control group. HR was decreased at 10 min in the fentanyl group. CI was decreased in all groups after tourniquet inflation. At 60 min, CI was more decreased in the control than the fentanyl group. Conclusions: Fentanyl injection prior to tourniquet inflation can attenuate the tourniquet induced hemodynamic changes in the knee arthroscopic surgery patients. (Korean J Anesthesiol 2009;56:6~10)
Quantitative analysis of H5N1 DNA hybridization on nanowell array electrode.
Cha, Min Seok,Lee, Ju Kyung,Cho, Si Hyeong,Park, Jin Goo,Lee, Hea Yeon,Lim, Sun Hee,Yoon, Young Ro American Scientific Publishers 2013 Journal of Nanoscience and Nanotechnology Vol.13 No.8
<P>A nanowell array electrode-based electrochemical quantitative system without amplification was developed and applied for the detection of H5N1 target DNA. An 18-mer probe was immobilized on a nanowell array electrode with a diameter of 500 nm, which was coated with streptavidin and a self-assembly monolayer (SAM). The surface properties of probe DNA hybridization with complementary target DNA were characterized using atomic force microscopy (AFM) and electrochemical impedance spectroscopy (EIS). The AFM image shows that the depth of nanowell was reduced from 200 nm to 15 nm due to the formation of a DNA hybridization complex on the streptavidin/SAM structure. Differences in charge transfer resistance (deltaR(ct)) in EIS upon hybridization of the probe DNA with complementary target DNA were analyzed and used for the quantitation of H5N1 DNA. This approach shows that the quantitative analysis of H5N1 DNA ranging from 1 pM to 1 microM DNA is possible on a nanowell array electrode.</P>