E171, a mixture of titanium dioxide, has been widely used as a food additive due to its whitening effect and low toxicity. However, it has been proven that E171 is no longer safe for public health. So far, there are insufficient studies on the toxic effects of E171 on organisms especially using standardized test methods. In this study, toxicity assessments of E171 to two aquatic species, water flea (Daphnia magna) and zebrafish (Danio rerio), were performed using modified standardized test methods based on the physicochemical properties of E171. The hydrodynamic diameter, polydispersity index, and turbiscan stability index (TSI) were measured to ensure the dispersion stability of E171 in exposure media during the test period. The EC50 for immobilization of water flea was 141.7 mg L-1 while zebrafish was not affected until 100 mg L-1 of E171. Measurements of reactive oxygen species (ROS) and antioxidant enzyme activities confirmed that E171 induced oxidative stress, leading to the activation of superoxide dismutase and catalase in both water flea and zebrafish, although the expression of antioxidant enzyme genes differed between species. These results suggested the potential risk of E171 to aquatic organisms and provided toxicological insights into the impacts of E171 on the environment.

Hunter's color value “a” in dried-persimmon of table and full ripe fruit was higher than that in unripe fruit. In case of soluble solid content, full ripe fruit was 50o Brix, the highest degree, while unripe fruit was 40o Brix, the lowest degree. PPO activation of unripe fruit was 4.7, which was higher than table-ripe fruit (0.7) and full ripe (1.0). Polyphenol oxidase activation remained even while drying, but there was no difference in PPO activation degree as drying period increased. Total phenol content of unripe fruit was 101.4, which was higher than table-ripe fruit (57.5) and full ripe fruit (67.4). Total phenol content level increased as drying period increased, which was based on fresh weight. Hardness of unripe and table ripe fruit continued to decrease until three weeks during softening. After that, hardness was high and it started drying. However, in full ripe fruit, hardness increased after two weeks and softening was fast during the drying period, and its weight reduction rate was lower than that of unripe and table ripe fruit.

경엽절제 정도에 따른 넓은잎큰조롱의 수량 및 품질을 구명하여 재배법 확립의 기초자료를 제공하고, 지주재배에 따른 경영비를 절감하고자 경엽절제 비율 10% 등 5처리를 두어 시험한 결과는 다음과 같다. 가. 지주재배(관행)에 비하여 무지주재배에서 경엽생육이 저조하였으며, 무지주재배 간에는 경엽 절제비율이 적을수록 줄기길이는 길었으나, 줄기굵기와 분지수는 절제비율이 많을수록 굵거나, 많은 경향이었다. 나. 엽폭은 경엽 절제비율이 적을수록 넓은 경향이었으나, 엽록소 함량은 경엽 절제비율이 많을수록 많은 경향이었다. 다. 근 생육은 지주재배에서 양호하였으며, 무지주재배에서의 상품수량은 경엽무절제 559 kg/10a 대비 경엽 10~20% 절제에서 9~13% 증수되었다. 라. 지주재배에 따른 경영비를 절감하기 위한 무지주재배시 최적 경엽절제비율은 20%이었다.

Bakanae disease, a typical seed-borne disease of rice, caused by Gibberella fujikuroi which affected rice quality and yields seriously throughout the country. The disease could be transmitted to other healthy plants in heading dates, and the environment-friendly agricultural practices could be one of the reasons for the outbreak of disease because of the chemical-free agriculture. Studies were conducted to investigate the effects of instrument devised to protect the bakanae disease. The newly developed device consists of aquarium heater and oxygen generator. The temperature of water remained stable as 32.6±0.9℃, and it was effectively applied to sterile seeds for high quality seedlings. In the field tests of infected seeds with bakanae disease, the ripened grain ratio decreased in the 30% infected seeds, and the yields of polished rice dropped as 28%. The secondary infection of bakanae disease was effectively prevented with 500 fold fludioxonil treatments just prior to the planting in the field.

The purpose of this study was to select and to recommend the optimum rice with the newly developed varieties at 11 agricultural technology service center(ATSC) in ChungBuk province. The newly bred 18 varieties were evaluated rice yields and quality, including rice taste at each districts from 2007 to 2009. In the overall consideration, Hopum-byeo was selected as the best rice variety in Chungju, Jincheon districts, and Samkwang-byeo was choosed as the best variety in Cheongju, Eumseong, Okcheon, and Yeongdong based on the yields of rice and mechanic rice tastes. Hopum-byeo and Samkwang-byeo was recommended in Cheongwon, Goesan, and Boeun districts. Unkwang-byeo was selected as optimum variety in Jecheon, and Danyang districts.