Aspergillus parasiticus가 몇가지 穀類에서 生成하는 Aflatoxin에 對하여

洪世永,金敎昌,金道榮 충북대학교 농업과학기술연구소 1986 農業科學硏究 Vol.4 No.-

In order to investigate the influence of temperature, moisture and culture time on the aflatoxins produced by Aspergillus parasiticus NHL 5243 on some grains,5 kinds of grain samples (rice, barley, wheat, corn and sorghum) were used. The different fractions of aflatoxin B1, B2, G1, and G2 were detected from 5 kinds of samples by TLC and HPLC. Fluorescence compounds showed blue (aflatoxin B1, B2) and blue green(aflatoxinG1, G2) under 365nm UV lamp, but all of them were changed to green-grey fluorescence by 50% H2SO4, soln. Spraying, and to pink(B1, B2) and blude (G1, G2) by p-anisaldehyde. Aspergillus parasiticus produced even more aflatoxins on grains tested under incubating at 25% moisture content level than 17%, 20%. No aflatoxin was detected at 17% in rice, without regard to any temperature and culture time. Aflatoxins were detected at 20℃, 20%, for 21 days, and at 30℃, any moisture content level (except17%) , for any incubation period. Samples at 30℃, were found more produced aflatoxins than at 20℃. Aflatoxin G1 was obtained more production than B1, B2 and G2 at any incubated conditions in all samples. Total amount of aflatoxins was 2454㎍/kg in rice, 1257㎍g/kg in barley, 986㎍/kg in wheat, 882㎍/kg in corn and 1483㎍/kg in sorghum under the same conditions(30℃, 25%, 21days). The greatest fields of aflatoxin were obtained in rice sample.

TEOS/O₂ 용 플라즈마 반응기에서의 미립자 성장에 대한 실험적 분석

홍성택,김교선 강원대학교 산업기술연구소 2003 産業技術硏究 Vol.23 No.A

A study on the particle growth in TEOS/O_2 plasma was performed by observing the particle size and its morphology by TEM The qualitative chemical analysis of particles was also determined by the EDS (Energy Dispersive X-Ray Spectrometer) The effects of process variables such as the plasma on-time and bubbler temperature on the particle growth were investigated. The particle size becomes larger as the plasma on-time because of the longer coagulation. and also as the bubbler temperature increases because of the faster coagulation between particles

유년형 난소 과립막 세포종 2예

어완규,김흥열,김홍배 고신대학교 의과대학 2008 고신대학교 의과대학 학술지 Vol.23 No.2

난소의 성기삭-간질 종양은 전체 난소 종양의 약 5~8% 를 차지하는 드문 종양으로서 그 중 약 70%는 과립막 세포종이다. 대부분 30세 이전에 발생하는 유년형 과립막 세포종은 전형적인 성인형 과립막 세포종에 비해서 임상적 및 병리학적 측면에서 매우 다른 양상을 나타낸다. 유년형 과립막 세포종은 대부분 좋은 예후를 나타내지만, 종양이 진행된 경우에는 병기, 종양의 크기, 피막 파열 여부, 핵의 비정형 정도, 유사분열 정도와 관련되어 나쁜 임상적 예후를 나타낸다. 유년형 과립막 세포종은 병기가 낮은 경우 수술이 최상의 치료 방법이지만, 병기가 높거나 재발된 종양에 대한 치료 방법은 아직 명확하지 않다. 저자들은 난소의 유년형 과립막 세포종 2예를 경험하였기에 문헌고찰과 함께 보고하는 바이다. Sex cord-stromal tumors of the ovary are rare neoplasms that account for about 5~8% of all ovarian malignancies, and about 70% of those are granulosa cell tumors. Juvenile granulosa cell tumor (JGCT), which occurs most frequently in the first two decades, has distinct differences from adult granulosa cell tumor (AGCT) with regard to clinical and pathological features. The prognosis of JGCT in children is good in most cases, but tumor with more advanced disease has worse clinical outcome correlated with its stage, tumor size, presence of ruptures, grade of nuclear atypia, and degree of mitotic activity. The best treatment choice for low stage JGCT is surgery, but those for advanced stage JGCT or recurrent tumor have not yet been determined clearly. We present two cases of JGCT with brief review of literatures.

Supercritical nano-plating 시스템에서 전해질/계면활성제 조성이 니켈 전기도금에 미치는 영향에 관한 연구

홍교민,김문선,정재관 한국공업화학회 2003 응용화학 Vol.7 No.1

In this study, experiments of a nikel elecroplating were performed in a supercritical nano-plating system using CO_2 as a supercritical fluid. Electrolyte and surfactant were important parameters on the nickel plating proces. Resistivity values decreased 60, 35, and 22 at 20, 30, and 50 wt% electrolyte, respectively, and over 60 wt%, the resistivity value was kept constant at 20. Surface properties of nickel film electroplated by the 60 wt% electrolyte solution with 2 wt% surfactant. The weight ratio of CO_2 and electrolyte as 1:9 was better then any other ratio in the plating properties.

CO_2 초임계 유체/전도성 에멀젼용액을 이용한 구리판에 대한 니켈 나노도금에 관한 연구

홍교민,홍성철,김문선,정재관 한국공업화학회 2002 응용화학 Vol.6 No.2

In this study, experiments of a nickel elecroplating were performed by a conductive emulsion solution of CO_2/electrolyte/surfactant/entrainer in the supercritical nanoplating system to investigate the effect of the resistivity on plating properties. Resistivity values decreased 60, 35, and 22 Ω at 20, 30, and 50 wt% electrolyte, respectively, and over 60 wt%, the resistivity value was kept constant at 20 Ω. Surface properties of nickel film electroplated by the emulsion solution with 60 wt% electrolyte at 8 MPa was better than that at atmospheric pressure.

都市計劃의 法定節次와 地方自治團體의 課題

洪性讚,張校湜 건국대학교 사회정책연구소 1999 사회과학연구 Vol.11 No.-

Supercritical Nano-Plating 시스템에서 전기도금된 니켈 막의 표면특성에 관한 연구

홍교민,김문선,정재관 한국공업화학회 2003 응용화학 Vol.7 No.2

In this study, experiments of a nickel electroplating were performed in a supercritical nano-plating(SCNP) system using CO₂as a supercritical fluid. Surface properties of nickel film electroplated by the electrolyte solution with 0.2 vol% surfactant and volume ratio of CO₂and electrolyte as 1:9 was the best in the plating properties, where surface roughness(Ra) of nickel film plated for 30 min by SCNP was 0.021 ㎛. The property of plated film with this new method was better than that by a conventional method.

수용액에서 γ형 알루미나 표면에 대한 니켈이온(Ⅱ)의 흡착특성

홍교민,김문선,정재관 한국공업화학회 2003 공업화학 Vol.14 No.3

γ형 알루미나의 흡착특성을 구명하기 위하여 본 실험에서는 수용액에서 γ형 알루미나를 흡착제로 이용하여 온도와 pH가 니켈이온(Ⅱ)의 흡착능에 미치는 영향을 관찰하고 알루미나 표면과 니켈이온(Ⅱ) 간의 Langmuir와 Freundlich 흡착등온식과 Lagergren 흡착속도식을 결정했다. 5 g Al_2O_3/L의 조건에서 니켈이온은 10 h에 흡착평형상태에 도달했다. PH 2~6의 범위에서 pH가 증가할 때 흡착량은 급격히 증가하다가 PH 6에서 최대 흡착량을 나타냈으며 pH 6~9의 범위에서는 pH가 증가하여도 흡착량은 일정했다. 온도 20℃에서는 흡착량이 적었으나 30℃에서 급격히 흡착량이 증가하였으며 30~50 ℃의 범위에서는 온도 증가에 따라 흡착량이 완만하게 증가했다. Freundlich 흡착등온식의 결정계수는 0.9489로 Langmuir식의 0.9265보다 높았으며 Lagersen 흡착속도식에서의 k_ad값은 0.0023 h^-1으로 결정계수는 0.9497이였다. In this paper, Langmuir and Freundlich adsorption isotherms, and Lagergen adsorption rate were determined and the effect of temperature and pH on the adsorptivity of Ni(Ⅱ) ions were investigated in order t() stud)'the adsorption characteristics of γ-type alumina. For 5 g Al_2O_3/L, the adsorption equilibrium was obtained in 10 h. The adsorption amount increased rapidly when pH incrteased from 2 to 6, and the maximum adsorption amount was observed at pH 6. For pH 6 to 9, however, the adsorption amount remained constant. The adsorption amount was low at 20℃. However, The adsorption amount increased with increased in temperature; the amount increased rapidly at 30℃ and increased linearly with temperature from 30 to 50℃. The correlation coefficient (R_2) for Freundlich adsorption isotherm was 039489%, and this was higher than that for Langmuir adsorption isotherm of 0.9268%. The adsorption coefficient (k_ad) of lagergen equation was 0.0023h^-1, and the correlation coefficient (R^2) was 0.9497.

압출기 유압펌프의 압력제어

김교형,이준홍 嶺南大學校 工業技術硏究所 2001 工業技術硏究所論文集 Vol.29 No.2

Pressure control of hydraulic pump in aluminum extrusion is adjusted by hand to get the optimum extrusion velocity Manual control of the extrusion velocity degrades the qualify of the surface due to the unevenness control of hydraulic pressure. In this study pressure control of hydraulic pump is simulated with fuzzy memory rule for aluminum process. Pressure response of the system has shown good results.

가을보리 재배기간중의 기상변화

심교문,이정택,윤성호,황규홍 한국농림기상학회 2000 한국농림기상학회지 Vol.2 No.3

The northward shift of the cultivation region of winter barley has been considered because of consecutive warm winters from the middle of 1980's. There was 1.02℃ rise in mean air temperature during winter barley cropping season from 1975 to 1998. During this period, the maximum air temperature affected the mean air temperature rise rather than the minimum air temperature. The amount of mean precipitation was 513.3mm during winter barley cropping season from 1975 to 1998 and was least in 1992. Sunshine hours has increased little by little in the all regions except rural regions. The air temperature during winter barley cropping season from 1987 to 1999 in which the winter was warm was higher than the normal air temperature(1961∼1990). On the other hand, the air temperature during winter barley cropping season from 1974 through 1986 was similar to the normal air temperature. The amount of mean precipitation during winter barley cropping season from 1987 through 1999 was similar to the normal precipitation except April. During this period, the amount of mean precipitation of April was lower by 26mm than the normal year(1961∼1990). Sunshine hours during winter barley cropping season from 1987 to 1999 decreased generally in comparison with a normal year. Considering the air temperature rise during wintering from 1987 to 1998, it might be possible to extend the cropping area of winter barley northward.