Chemical equilibrium calculations for multicomponent aqueous systems involving the reductive dissolution of magnetite (Fe3O4) with oxalic acid (H2C2O4) were performed using the HSC Chemistry® version 9. They were conducted with an aqueous solution model based on the Pitzer’s approach of one molality aqueous solution. The change in the amounts and activity coefficients of species and ions involved in the reactions as well as the solution pH at equilibrium was calculated while changing the amounts of raw materials (Fe3O4 and H2C2O4) and the system temperature from 25°C to 125°C. In particular, the conditions under which Fe3O4 is completely dissolved at high temperatures were determined by varying the raw amount of H2C2O4 and the temperature for a given raw amount of Fe3O4 fed into the aqueous solution. When the raw amount of H2C2O4 added was small for a given raw amount of Fe3O4, no undissolved Fe3O4 was present in the solution and the pH of the solution increased significantly. The formation of ferrous oxalate complex (FeC2O4) was observed. The equilibrium amount of FeC2O4 decreased as the raw amount of H2C2O4 increased.

This study was carried out between 2008 and 2009 in four dairy farms to investigate the effect of feeding of whole crop barley silage on the reproductive performance of Holstein heifers. Two diets, mixed hay or whole crop barley silage separately from concentrate were fed 6-month old Holstein heifers (=37). In control group (=CON), heifers (n=16) were fed 6 kg (/head) mixed hay and 4 kg (/head) commercial diet. In whole crop barley silage group (=WBS), heifers (n=21) were fed 10 kg (/head) whole crop barley silage, 4 kg (/head) mixed hay and 2 kg (/head) commercial diet. To manage body weight gain, the body condition score of heifers were measured every month. The results obtained were as follows: 1. Body weight in CON and WBS heifers at 13-, 14-, 15- and 17-month old were 340±17.9 and 342±13.6 kg, 356±15.7 and 366±14.7 kg, 382±13.1 and 387±14.4 kg, and 429±15.0 and 417±10.3 kg, respectively. 2. Body condition score in CON and WBS heifers at 9-, 12-, 15- and 17-month old were 2.88±0.04 and 2.80±0.04, 2.88±0.04 and 2.80±0.04, 2.89±0.08 and 3.00±0.07, and 2.89±0.08 and 3.00±0.07, respectively. 3. Average age of sexual maturity in CON and WBS heifers were 437.3±9.9days and 939.6±12.5days, WBS group heifers were significantly shorter (p<0.05) than CON group heifers. 4. First-service conception rates in CON or WBS group were 81.3% (13/16) and 66.7% (14/21), respectively, and cumulative conception rate to 2nd artificial insemination were 87.5% for CON and 85.7% for WBS group. Conception rate was not different between treatments

Nowadays, importance of regional specific on-farm research is largely increased in order to reduce the feeding cost of cattle. For this project, three regional districts (Yeongam, Yeonggwang and Jangheung) were selected wherein the cultivation area of forage production were largely increased from 1,200 ('08) to 2,600 ㏊ ('09) in Yeongam, 1,001('08) to 1,925 ㏊ ('09) in Yeonggwang, and 1,300 ('08) to 2,820 ㏊ ('09) in Jangheung district. Among the forage species, Italian ryegrass (IRG) and forage barley were predominantly cultivated in these regions. On the other hand, rye, grassland and summer annual forages were cultivated very little in a manner of land area. The productivity of forage barley was slightly increased 21.5('06), 26.2('07), and 27.3 MT/㏊ ('08) as silage. The number of farm and cultivation area was also increased remarkably. The present research project will be conducted from 2009 to 2010. Forage production and utilization for reduction of feeding cost, and high quality of Hanwoo beef production will investigated, in a manner of cultivation of forage crops mainly IRG, forage barley, IRG+barley mixture and corn.

당뇨병 환자의 혈당치 측정을 위하여 다층젤라틴 필름으로 만들어진 진단막을 제조하였다. 플라즈마와 혈액 속의 글루코우즈의 농도 변화에 따른 최대확산속도를 측정하였다. 여러 가지 온도에서 3일, 2주, 4주 보관후 온도가 글루코우즈의 확산속도에 미치는 영향을 조사하였다. 다층 젤리탄 진단막의 안정성을 상대습도 80%에서 측정하였다.

새로운 복합막의 제조를 위하여 기존의 복합막에서 지지막으로 주로 사용되던 Polysulfone을 이보다 친수성이 뛰어난 Polyethersulfone막으로 대체하여 지지막을 직접 제조하고 이에 따른 복합막의 성능을 살펴 보았으며 이때 각 단계별로 제조막의 성능을 평가하여 각 단계별 최적 조건을 찾고자 하였다. 지지막은 Polythersulfone과 Polyvinylpyrrolidone의 조성에 따라 각각 실험하였으며, 활성층은 계면중합법에 의하여 m-Phenylene diamine과 Trimesoyl chloride를 반응시켜 제조하였다.

감응물질로 제4급 암모늄염을 사용하여 PVC를 지지체로 과염소산이온의 농도 10-6M까지 측정가능한 이온 선택성 전극을 제작하였다. 감응물질의 화학적 구조와 함량, 가소제의 종류 및 막 두께에 따른 선형응답 범위와 Nernst의 기울기 등 전극특성을 검토하여, 최적 막조건을 구한 다음 측정가능 pH범위와 여러 방해이온에 대한 선택계수를 비교 검토하였다. 과염소산 이온선택성 전극에서 감응물질의 화학적 구조 즉, 알킬기의 탄소고리수가 증가할수록 선형응답 범위 등 전극 특성은 Aliquat 336P, TOAP, TDAP 및 TDDAP의 순서로 좋아졌다. 가소제는 DBP가 가장 좋았고, 감응물질의 양은 최적 함량 이상에서 적을수록 좋았다. 최적 막 조성은 TDDAP 9.09, PVC 30.3 및 DBP 60.61wt%이었고, 막두께 0.45mm이었다. 이 조건에서 선형응답 범위 10-1~1.2 × 10-6M, 검출한계 5.1×10-7M 및 Nernst기울기 57mV/pClO4이었다. 막전위는 pH 4~11 범위에서 pH의 영향을 받지 않았으며, 선택계수 서열은 다음과 같았다. SCN->I->NO3->Br->ClO3->F->Cl->SO42-