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Fe(2)-DTPA 착물의 촉매작용을 이용한 루미놀 화학발광 시스템의 선택적 Fe(2) 정량
이상학 ( Sang Hak Lee ),김경민 ( Kyung Min Kim ),홍석주 ( Suk Joo Hong ),김규만 ( Gyu Man Kim ),조해진 ( Hae Jin Jo ),장택균 ( Taek Gyun Jang ),김영호 ( Young Ho Kim ) 한국공업화학회 2011 응용화학 Vol.15 No.2
A sensitive and selective determination method of Fe(Ⅱ) ion by luminol-H2O2 system using a chelating reagent has been presented. A metal ion-chelating ligand complex such as Fe(Ⅱ)-diethylenetriamine pentaacetic acid (DTPA) produced higher chemiluminescence (CL) intensity as well as longer lifetime in luminol-H2O2 system than metal exist as free ions. Furthermore, the catalytic activity of Cu(Ⅱ) and Pb (Ⅱ) complexes with chelating reagents in luminol-H2O2 system was lost since chelating reagents act as a masking agent although free Cu(Ⅱ) and Pb(Ⅱ) ions have high catalytic activity. On the optimized conditions, the calibration curve of Fe(Ⅱ) ion was linear over the range from 1.0×10-7 to 2.0ⅹ10-5 M with correlation coefficient of 0.996. The detection limit was calculated to be 4.0×10-8 M.
은 나노입자를 이용한 화학발광법에 의한 L-alanine의 정량
조해진 ( Hae Jin Jo ),장택균 ( Taek Gyun Jang ),최종하 ( Jong Ha Choi ),서정기 ( Jung Kee Suh ),전치완 ( Chi Wan Jeon ),김영호 ( Young Ho Kim ),이상학 ( Sang Hak Lee ) 한국공업화학회 2011 응용화학 Vol.15 No.1
A chemiluminescent method with silver nanoparticles for determination of L-alanine has been presented. The chemilumiscence intensity was further enhanced by silver nanoparticles in the luminol system by its catalytic role. The silver nanoparticles enhanced chemiluminescent method is applicable for the determination of an amino acid such as alanine. When alanine was introduced to the luminol system with silver nanoparticles, chemiluminescence intensity was reduced with the concentration of the added alanine. The effects of pH, concentrations of luminol, hydrogen peroxide and silver nanoparticles on the chemiluminescence intensity were investigated. The calibration curve for L-alanine was linear over the range from 6.60×10(-8) M to 4.00×10(-7) M, coefficient of correlation was 0.996 and detection limit was 3.5×10(-9) M under the optimal conditions of 4.0×10(-3) M, 4.0×10(-2) M, 4.0×10(-4) M, 12.8 for the concentration of luminol, H2O2, silver nanoparticles and pH, respectively.
선식에서 분리한 Enterobacter sakazakii의 복합동정 및 RAPD를 이용한 genotyping
최재원(Jae-Won Choi),김윤지(Yun-Ji Kim),이종경(Jong-Kyung Lee),김영호(Young-Ho Kim),권기성(Ki-Sung Kwon),황인균(In-Gyun Hwang),오세욱(Se-Wook Oh) 한국식품과학회 2008 한국식품과학회지 Vol.40 No.1
시판되고 있는 선식 원료를 수거하여 최근 새로운 식중독균으로 보고되고 있는 Enterobacter sakazakii 분리 실험을 실시하였다. 그 결과 총 23종의 선식 원료 중 8개의 선식 원료에서 E. sakazakii로 추정되는 콜로니를 분리할 수 있었으며 API 20E kit를 이용하여 1차적으로 동정한 결과, 다시마 분말, 멸치 분말, 현미 분말, 청국장 분말 및 멥쌀 분말에서 E. sakazakii를 분리할 수 있었다. 이후 3 종의 primer를 이용한 PCR을 실시하여 2차적으로 동정하였다. 또한, 분리된 균주에 대한 RAPD-PCR을 실시하여 최종적으로 8종의 분리균으로 molecular typing을 할 수 있었다. Enterobacter sakazakii is implicated in severe forms of neonatal infections such as meningitis and sepsis. This organism has been isolated from a wide range of foods, including cheese, vegetables, grains, herbs, and spices, but its primary environment is still unknown. Generally, dried infant milk formula has been epidemiologically identified as the source of E. sakazakii. Sunsik (a powdered mixture of roasted grains and other foodstuffs) is widely consumed in Korea as a side dish or energy supplement. Sunsik is consumed without heat treatment; thus, lacking an additional opportunity to inactivate foodborne pathogens. Therefore, its microbiological safety should be guaranteed. In this study, the prevalence of E. sakazakii was monitored in 23 different sunsik component flours, using FDA recommended methods; but E. sakazakii medium (Neogen) and Chromogenic E. sakazakii medium (Oxoid) were used as the selective media. In total, presumptive E. sakazakii strains were isolated from 8 different sunsik powders. Subsequently, an API 20E test was conducted, and 15 strains from 5 different sunsik flours (sea tangle, brown rice, non-glutinous rice, cheonggukjang, dried anchovy) were confirmed as E. sakazakii. Fifteen strains were again confirmed by PCR amplification, using three different primer sets (tDNA sequence, ITS sequence, 16S rRNA sequence), and compared to ATCC strains (12868, 29004, 29544, 51329). They were once again confirmed by their enzyme production profiles using an API ZYM kit. Finally, RAPD (random amplified polymorphic DNA)-genotyping was carried out as a monitoring tool to determine the contamination route of E. sakazakii during processing.
Deep-Deck와 보강용 캡플레이트의 직결나사 접합부에 관한 구조성능평가 연구
박기연(Park Ky-Youn),김도균(Kim Do-Gyun),김영호(Kim Young-Ho),최성모(Choi Sung-Mo) 대한건축학회 2011 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.31 No.2(구조계)
Despite the deck plate used as composite slab or slab form is a light gage steel, it has a good section performance and it is not necessary to provide supports on slab form in mild and small span to ensure a field working space, safety, and efficient workability. To solve this problem structurally, the cross section maybe made to the shape of the closed cross section by installing the cap plate on top of the deck plate to overcome the instability of an open cross section and to suppress the central variants by increasing the stiffness of the section. In this study, the structural capacity of the self drilling screw connection between the deep deck and the reinforced cap plate was evaluated by experimental variables such as screw arrangement method, screw numbers, screws pitch, and screws head plate thickness.
금 나노입자의 증감효과를 이용한 화학발광법적 Perphenazine 정량
( Al Mahmnur Alam ),( Mohammad Kamruzzaman ),이상학 ( Sang Hak Lee ),김영호 ( Young Ho Kim ),장택균 ( Taek Gyun Jang ),홍석주 ( Suk Joo Hong ),오상협 ( Sang Hyub Oh ) 한국공업화학회 2011 응용화학 Vol.15 No.2
A rapid and sensitive chemiluminescence (CL) method was designed for the determination of trace amount of perphenazine (PERN) based on the gold nanoparticles enhanced luminol-H2O2-PERN system. The degree of enhancement of CL signal intensity of the system was proportional with the concentration of PERN. Under optimum experimental conditions, the linearity of CL signal intensity was observed in the range of 3.5×10-9 to 2.0×10-7 mol/L (r2= 0.9995) with a detection limit of 1.37×10-9 mol/L. Precision of the method was tested at the concentration level of 1.0×10-7 mol/L for 8 replicate measurements giving value of RSD 2.25%.