In this study, sixty chemicals including 47 pesticides were screened for estrogenic activity using E-screen assay. MCF-7 cell, used in E-screen assay, is known to be proliferated by addition of estrogenic chemicals. Eight of the measured pesticides showed estrogenic activity at the concentration range of 100-10,000nM. Their relative proliferative effect (RPE) and the relative proliferative potency (RPP) were 20-65% and 0.01-1.0%, respectively, when compared with 1.0nM of β-Estradiol-17-acetate(E2). DDVP and diazinone showed most strong estrogenic potency(RPP; 1.0%) and effect(RPE; 65%) of the eight pesticides. These results are in agreement with estrogenic activity of bisphenol A is known as a positive endocrine disrupter. Also, in this study, paraquat, DDVP, 4- chloro-3-methylphenol, 2,4,6-trichlorophenol and diazinon of the measured pesticides are estimated to estrogenic chemical.

Air pollution from the Daegu industrial complex (DIC) in Korea has been a common nuisance and cause of complaints for nearby residents. The current study measured the indoor and outdoor levels of six VOC (benzene, toluene, ethylbenzene, and three isomeric xylenes) at two residential areas with a different proximity to the DDIC, plus the ambient levels at two industrial areas within the boundary of the DDIC. The QA/QC program included the range of correlation coefficient (0.94～0.99) for calibration curves, within the permissible range. Toluene was the most abundant VOC in the ambient air both in residential and industrial areas. Both indoor and outdoor air concentrations of all target VOC except benzene were higher in residential area near the DIC compared to that further away from the DIC. Moreover, the ambient air concentrations of all target VOC except benzene for two industrial sites (A and B) were significantly higher than the outdoor or indoor air concentrations in the two residential areas. The findings further suggested that VOC ambient levels measured in a residential area near the DIC be used as a potential indicator of odor-causing unidentified air pollutants transported from the DIC. Moreover, it was found that the elevated ambient toluene levels outweighed the indoor sources with respect to the environmental exposure of residents nearby the DIC. However, in the residential area further away from the DIC, the toluene indoor sources outweighed the outdoor sources.

21 종의 생약 추출물을 선정하여 5 μg/ml의 농도에서 SK-MEL-28 cell 에 대한 세포독성을 조사한 결과 목단피의 메탄올 추출물이 74.3%의 성장율을 보였다. 활성 물질을 찾기 위하여 목단피로부터 silica gel column chromatography를 실시하여 hexane 분획과 EtOAc 분획에서 충 5개의 화합물을 분리하였고 mp, UV, IR, 1H-NMR, 13C-NMR 등 각종 물리, 화학적 data로부터 그 구조를 paeonol (1), benzoylpaeoniflorin (2), benzoic acid (3), 2,5-dihydroxy-4-methoxy-acetophenone (4), paeoniflorin (5)으로 동정하였다. 분리한 물질을 human 피부 암세포인 SK-MEL-28 세포주에 대하여 10 μg/ml의 농도에서 SRB방법으로 세포독성을 측정한 결과 compound 4가 ED50 값이 5.92 μg/ml로 가장 좋은 세포독성을 나타내었다. 이결과는 compound 4가 SK-MEL-28 melanoma 세포주에 대한 새로운 항암 후보 물질임을 제시한다.

오차드그래스의 최적 조직배양조건을 확립하기 위하여 'Roughrider' 품종의 성숙종자로부터 최적 배발생 캘러스 유도 및 식물체 재분화에 미치는 배지첨가물질의 영향을 조사하였다. 성숙종자로부터 배발생 캘러스 유도시 첨가되는 생장조절 물질로는 3 mg/L 2,4-D가 가장 효율적이었으며, 식물체 재분화에는 1 mg/L 2,4-D와 3 mg/L BA가 첨가된 배지에 캘러스를 배양했을 때 36.3%의 재분화율을 나타내었다. 캘러스 유도배지와 재분화배지에 1 g/L의 casein hydrolysate와 300 mg/L의 proline을 동시에 첨가해주었을 때 캘러스 유도율과 재분화율이 각각 57.3%와 60.7%로 증가되었다. 또한 항산화물질로서 10 mg/L의 AgNO3 와 40 mg/L의 cysteine을 첨가해준 과 켈러스 유도율 재분화율 각각 68.7%와 71.7%까지 증가되었다. 본 연구를 통하여 확립된 성숙종자로부터 효율적인 배발생 캘러스의 유도 및 식물체 재분화 체계는 유전자 형질전환을 통한 신품종 오차드그래스 개발에 유용하게 응용되어질 수 있을 것이다.

In recent years, the consumption of livestock products were markedly decreased by awareness of world-widely occurred diseases including mad cow disease, Foot and mouth disease, Hog cholera, and Poultry Influenza virus. The consumers are also wanting to have highly safe food such as organic animal products because of concerning about residual of antibiotics in animal products. However, disease control and impairment of productivity are the major problem in organic animal production. On these points of view, the present study was undertaken to investigate the effects of 1% or 2% of dietary probiotics fortified with various minerals on improvement of egg production and egg quality in old layer feeding low quality feed mainly composed of food waste, sesame meal, and rice bran. After 4 weeks of experimental feeding, the diameter of spreading of egg white was clearly decreased from 11.2cm of control eggs to 10.5m and 10.1m in 1% and 2% treatment group eggs, respectively. The color of egg yolk was 9.3 in control eggs but remarkably increased in treatment groups showing 10.1~10.2. Egg production was 75.8% in control layers but significantly increased to 79.8% of 1% treatment group and 82.9% of 2% treatment group layers. Egg weights (C : 66.3g, 1% : 73.2g, and 2% : 76.7g) and egg shell thickness (C : 0.33㎜, 1% : 0.35㎜ and 2% : 0.36㎜) were also increased by the addition of 1% or 2% of probiotics when compared to those of control group eggs. All together, it has been suggested that dietary addition of probiotics fortified with various minerals can improve the egg quality and egg production in layer"s productivities by the recycling of organic waste resources such as food waste and agricultural by-products.

단삼(丹蔘)을 bioassay-directed fractionation에 의한 에탄올 추출물의 클로로포롬 분획물을 silica gel column chromatography, recycling preparative-HPLC 등을 실시하여 항균활성을 나타내는 2개의 화합물을 분리하여 이화학적 성상 및 spectra data (IR,1H-NMR, 13C-NMR 및 Mass)에 의해 각각 Cryptotanshinone과 dihydrotanshinone I으로 동정하였으며, 이들 화합물의 항균성 (MIC)은 각각 S. epidermidis에 대하며 6.3, 3.1 μg/ml와 S. pyogenes에 대해 6.3 μg/ml로 비교적 높은 활성을 나타내어 항생제로서 개발 가능성을 보여주었다.