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(±)-6a, 7-Dihydro-1-hydroxy-6, 6-dimethyl-3-pentyl-6H-dibenzo [b,d] pyran-9(8H)-one의 염소화 반응에 관한 연구
홍기운,육찬남,백승화 圓光大學校 1991 論文集 Vol.25 No.2
(±)-6a, Dihydro-1-hydroxy-6, 6-dimethyl-3-pentyl-6H-dibenzo[b,d] pyran-9[8H]-one의 염소화 반응은 metal halide와 함께 18-crown-6존재하에m-chloroperbenzoic acid에 의해 산화반응이 일어났다. 이 반응계에서는 염소화 반응이 방향족 고리에만 선택적으로 일어났다. (±)-6a, 7-Dihydro-1-hydroxy-6, 6-dimethyl-3-pentyl-6H-dibenzo [b, d]pyran-9(8H)-one has been chlorinated in the aromatic ring with metal halide in the presence of 18-crown-6 on oxidation with m-chloroperbenzoic acid. This reagent system effects the regiospecific chlorination of activated aromatic ring over olefinic double bond.
曺在興,陸燦男 조선대학교 기초과학연구소 1987 自然科學硏究 Vol.10 No.1
Crystallization of PET copolymers with some comonomers were studied by differential scanning calorimetry and densitometry. The results as follows; (1) Crystallinities of PET were increased with increasing the densities of the PET copolymers. (2) Crystallization was delayed with increasing the viscosities of PET copolymers. (3) Crystallization temperature were decreased with increasing the mole percent of copolymers used.
(±)-6a, 7-Dihydro-1-hydroxy-6, 6-dimethyl-3-pentyl-6H-dibenzo[b, d] Pyran-9(8H)-one의 염소화 반응에 관한 연구
백승화,홍기운,육찬남 원광대학교기초자연과학연구소 1992 基礎科學硏究誌 Vol.11 No.3
(±)-6a, 7-Dihydro-1-hydroxy-6, 6-dimethyl-3-pentyl-6H-dibenzo[b, d] pyran-9[8H]-one 의 염소화 반응은 metal halide와 함께 18-crown-6존재하에 m-chloroperbenzoic acid에 의해 산화반응이 일어났다. 이 반응계에서는 염소화 반응이 방향족 고리에만 선택적으로 일어났다. (±)-6a, 7-Dihydro-1-hydroxy-6, 6-dimethyl-3-pentyl-6H-dibenzo[b, d] pyran-9[8H]-one has been chlorinated in the aromatic ring with metal halide in the presence of 18-crown-6 on oxidation with m-chloroperbenzoic acid. This reagent system effects the regiospecific chlorination of activated aromatic ring over olefinic double bond.
Antifungal Effect of Brachyglottis repanda Ethanol Extract
Chan Nam Yook,Young Soon Na,Hwa Jung Choi,Il Soo You,Jong Min Baek,Seung Hwa Baek 한국독성학회 2010 Toxicological Research Vol.26 No.2
The crude ethanol extract of B. repanda showed the cytotoxic activity against Polio virus (25% activity at 150 ㎍/disk) and the minor cytotoxic activity against BSC cells (African green monkey kidney). However, the crude ethanol extract of B. repanda was non-toxic to murine leukaemia cells CCL 46 P388D1 (IC??, > 62,500 ng/ml). Cytotoxic and antifungal activities were strongly shown by Fr. 64-3 which was eluted with 90% CH₃CN/H₂O, 100% CH₃CN, and 50% CH₃CN/H₂O (SM 2 at 150 ㎍/disk). The fraction 64-3 also showed the most cytotoxic activity against murine leukaemia cells (128 ㎎, IC?? 10,051 ng/ml at 75 ㎍/disk). These results suggest that this fraction has a potent antifungal activity against the dermatophytic fungus Trichophyton mentagrophytes ATCC 28185.
Antifungal Effect of Brachyglottis repanda Ethanol Extract
Yook, Chan-Nam,Na, Young-Soon,Choi, Hwa-Jung,You, Il-Soo,Baek, Jong-Min,Baek, Seung-Hwa Korean Society of ToxicologyKorea Environmental Mu 2010 Toxicological Research Vol.27 No.2
The crude ethanol extract of B. repanda showed the cytotoxic activity against Polio virus (25% activity at $150{\mu}g$/disk) and the minor cytotoxic activity against BSC cells (African green monkey kidney). However, the crude ethanol extract of B. repanda was non-toxic to murine leukaemia cells CCL 46 P388D1 ($IC_{50}$, > 62,500 ng/ml). Cytotoxic and antifungal activities were strongly shown by Fr. 64-3 which was eluted with 90% $CH_3CN/H_2O$, 100% $CH_3CN$, and 50% $CH_3CN/H_2O$(SM 2 at $150{\mu}g$/disk). The fraction 64-3 also showed the most cytotoxic activity against murine leukaemia cells (128 mg, $IC_{50}$ 10,051 ng/ml at $75{\mu}g$/disk). These results suggest that this fraction has a potent antifungal activity against the dermatophytic fungus Trichophyton mentagrophytes ATCC 28185.
Pharmacological Screening of Crude Extracts from Medicinal Plants (II)
Yook, Chan-Nam,Lee, Jae-Sug,Baek, Seung-Hwa The Physiological Society of Korean Medicine and T 2007 동의생리병리학회지 Vol.21 No.4
The effects of crude extracts from medicinal plants on biological activity were investigated. The crude ethanol extract of H. paucistipula inhibited the growth of the Gram positive bacterium Bacillus subtilis ATCC 19659, (2 mm inhibition zone at 150 ${\mu}g$/disc) and the dermatophyte Trichophyton mentagrophytes ATCC 28185, (7 mm inhibition zone at 150 ${\mu}g$/disc), and toxic to P388 murine leukaemia cells ($IC_{50}\;2.48\;{\mu}g/ml$ at 75 ${\mu}g$/disk). This crude ethanol extract of H. paucistipula is the strongest antimicrobial and cytotoxic activities against P388 murine leukaemia cells (ATCC CCL 46 P388D1).
육찬남(Chan-Nam Yook),김정수(Jung-Soo Kim),한광수(Kwang-Soo Han) 대한환경위생공학회 2003 대한환경위생공학회지 Vol.18 No.3
To obtain the preliminary design data for combustion of paper sludges, decomposition characteristics and combustion kinetics of paper sludges reactor have been determined in a TGA reactor. Also, the combustion characteristics of paper sludges have been determined in a fluidized bed reactor.<br/> The data obtained from the TGA reactor indicate that de watering of paper sludge is terminated at temperature below 130℃. With heating rate of 20°C/min, combustion is terminated at temperature below 340℃. The combustion rate is found to be first order with respect to temperature and oxygen concentration.<br/> Activation energies for paper wastes are found to be 570, 700, 2600, 4600 Kcal/mole, respectively. The calcination conversions were investigated with the operating temperature and residence time. In this investigation. it was found that calcination conversion was affected by the operating temperature and residence time. The optimum conditions of operating temperature and mean residence time were 850℃ and 6 minutes of respectively.