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최학준 ( Hakjoon Choi ),곽경자 ( Gyeongja Gwak ),최다빈 ( Dabin Choi ),박재영 ( Jaeyoung Park ),정현숙 ( Hyeonsook Cheong ) 한국미생물생명공학회(구 한국산업미생물학회) 2015 한국미생물·생명공학회지 Vol.43 No.4
현미는 도정한 백미보다 이로운 영양분을 더 많이 함유하고 있다. 본 연구에서는 현미를 이용하여 만든 현미 발효 슬러리의 이화학적 특성과 항균활성에 대해 시험하였으며, 현미발효슬러리의 항균활성은 paper disc-agar diffusion 방법을 이용하여 6가지 병원성 균주 (Staphylococcus aureus, Escherichia coli, Listeria monocytogenes, Pseudomonas aeruginosa, Salmonella typhimurium and Yersinia enterocolitica)와 2가지 발효균주(Gluconacetobacter intermedius and Lodderomyces elongisporus)에 대해 항균성을 조사하였다. 특히, Staphylococcus aureus, E. coli, Listeria monocytogenes, P. aeruginosa, Salmonella typhimurium, Y. enterocolitica 그리고 Lodderomyces elongisporus에 대해서는 시판 항생제인 카베니실린과 테트라사이클린보다 더 높은 항균활성을 보였다. 항산화활성은 2,2-diphenyl-1-picrylhydrazyl (DPPH) 라디칼 소거능을 이용하여 측정하였을 때, 대표되는 항산화제인 아스코르빅 산과 비슷한 활성을 나타내었다. 현미발효슬러리의 발효중에 나타나는 균주를 동정하기 위해 TSB 고체배지와 YPD 고체배지에 현미발효슬러리를 도포하였을 때, 분리된 콜로니를 16S rDNA sequence 분석을 통하여, 네가지 균주를 분리하였으며, phylogenic tree 분석법을 이용하여 조사하였을 때, 각각 G. intermedius, Lactobacillus casei, Lactobacillus plantarum 그리고 Acetobacter peroxydans와 유사하였다. Unpolished rice (UR) is considered to be a healthy alternative to white rice when coping with chronic diseases. In the present study, the fermented slurry of unpolished rice (FSUR) was evaluated with respect to its antimicrobial activities and biochemical characteristics, including the quantities of sugar, total soluble sugar, organic acids, free amino acids, pH, and physiological activity. The antimicrobial efficiency of FSUR was assessed using the paper disc-agar diffusion method. FSUR exhibited strong antimicrobial activity against six pathogenic bacterial strains (Staphylococcus aureus, Escherichia coli, Listeria monocytogenes, Pseudomonas aeruginosa, Salmonella typhimurium, and Yersinia enterocolitica) and two fermentation strains (Gluconacetobacter intermedius and Lodderomyces elongisporus). The antimicrobial activity of FSUR was higher than the commercial antibiotics, carbenicillin (50 μg/ml) and tetracycline (50 μg/ml) against S. aureus, E. coli, L. monocytogenes, P. aeruginosa, S. typhimurium, Y. enterocolitica, and L. elongisporus. Also FSUR had a high antioxidant activity. The microorganisms were isolated from FSUR using tryptic soy broth and yeast extract-peptone-dextrose agar media. The isolated microorganisms were characterized using physiological and biochemical analyses as well as by 16S rRNA gene sequencing and phylogenic analysis. 16S rRNA gene sequence analysis showed that the isolated microorganisms had a high similarity to G. intermedius, Lactobacillus casei, Lactobacillus plantarum, and Acetobacter peroxydans.
Generation of Model Diesel Particles by Spark Discharge and Hydrocarbon Condensation
Hakjoon Kim,Jinho Kim,Youngjoo Choi,Hyenchul Oh,Jungbum Chu,Sangsoo Kim 대한기계학회 2006 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.20 No.11
This study was conducted in order to generate model particles which were similar to particles in diesel emission. Spark discharge was used for carbon agglomerates and hydrocarbon condensation for particles that consist of carbon agglomerates and hydrocarbon. The size of the carbon agglomerates, whose mean size were 30 and 70 ㎚, ranged between 15 and 200 ㎚, and the total number concentration of the particles ranged from 3 to 5 × 10?#/㎤ as the controllable variables in spark discharge generator changed. The result of the hydrocarbon condensation experiment showed that the final sizes of the particles enlarged by condensation did not depend on the initial sizes, but the maximum condensational growth of carbon agglomerates by dodecane (C₁₂ H₂?) condensation was 112 times the initial size of 40 ㎚, while the size of the agglomerates by benzene (C?H?) was 3.25 times its initial size.
Antiferromagnetic Interlayer Exchange Coupling in Ferromagnetic GaMnAs/GaAs:Be Multilayers
Lee, Hakjoon,Lee, Sangyeop,Choi, Seonghoon,Yoo, Taehee,Lee, Sanghoon,Liu, Xinyu,Furdyna, Jacek K. IEEE 2015 IEEE transactions on magnetics Vol.51 No.11
<P>Interlayer exchange coupling (IEC) between the GaMnAs layers in GaMnAs/GaAs:Be multilayer systems has been investigated using magnetotransport experiments. The observation of a stable antiparallel magnetization alignment state from the systems indicates the presence of antiferromagnetic (AFM) IEC between the GaMnAs layers. The transitions between parallel and antiparallel alignments of GaMnAs magnetic layers in the system were carefully investigated by measuring resistance change with increasing temperature under various bias magnetic fields. From the dependence of the transition temperature on bias fields, we have estimated the magnitude of AFM IEC and its temperature behavior of our GaMnAs/GaAs:Be multilayers.</P>
스파크 방전과 탄화수소 응축을 이용한 모형디젤입자 발생과 모형입자에 대한 오존 영향
김학준(Hakjoon Kim),김진호(Jinho Kim),최영주(Youngju Choi),오현철(Hyenchul Oh),추정범(Jungbum Chu),김상수(Sangsoo Kim) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
This study was conducted in order to generate model particles of particles in diesel emission without engine setup and then to investigate a way to remove those particles by ozone treatment. The particles, which consist of carbon agglomerates and hydrocarbon, were generated from a spark discharge generator and hydrocarbon condensation. The sizes of enlarged carbon particles by the condensation of benzene(C?H?) and dodecane(C₁₂H₂?) did not depend on the initial sizes, 40 and 80㎚. But the maximum condensational growth of carbon agglomerates by dodecane condensation was 112 times as the initial size, 40nm, while that of the agglomerates by benzene was 3.25 times. And ozone treatment on the particles made the size distribution shift to lower size range, which means their mean size decreased by the maximum value, 8.8%.