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우리나라 젖소 유방염(乳房炎) 원인균(原因菌)의 역학적조사(疫學的調査) 및 치료(治療)에 관(關)한 연구(硏究)
정창국,한홍율,정길택,Cheong, Chang Kook,Han, Hong Ryul,Chung, Gill Taik 대한수의학회 1970 大韓獸醫學會誌 Vol.10 No.1
A total of 835 quarter milk samples of 212 dairy cows from 14 herds were examined for mastitis and the results obtained were as follows; 1. Three hundred and fifty-eight quarters(42.9%) from 149 cows(70.3%) were found to be infected with mastitis. It was found that 11(1.3%) of the infected quarters were clinical mastitis and all of the rest were subclinical mastitis. 2. Streptococcus agalactiae(62 quarters) and Staphylococcus aureus(42 quarters) were the main two causative organisms of the mastitis. Streptococcus dysgalactiae, Streptococcus uberis, other streptococci, Corynebacteria, and Yeast were also found to cause the infection. 3. The majority of Staphylococcus aureus strains were sensitive to penicillin, orbenin, terramycin, and leucomycin, however, the most of Streptococcus strains were sensitive to penicillin and orbenin only. 4. Penicillin and orbenin were highly effective in the treatment of mastitis, especially orbenin for Staph ylococcus aureus infection and penicillin for Streptococcal infection. 5. A mastitis control program for dairy farms in Korea was discussed and recommended.
조충호,황우석,정창국,전윤성,이흥식,이창우,Jo Chung-Ho,Hwang Woo-Suk,Cheong Chang-Kook,Jeon Yun-Seong,Lee Heung-Shik,Lee Chang-Woo 한국임상수의학회 1987 한국임상수의학회지 Vol.4 No.2
Quick freezing of bovine embryos was attempted after they were predehydrated at room temperature. Combined solutions of 2M glycerol or 2M ethylene glycol in the presence of either 0.5 or 1.0M sucrose in phosphated buffered saline+20% calf serum were compared. The quick freezing method in which embryos were directly transferred in liquid nitrogen vapor for 2 minutes at - l70$^{\circ}C$ before being plunged into liquid nitrogen was used. Post-thaw survival rates in 2M glycerol and 2M ethylene glycol were high with 0.5 M (55.6% and 53.3%) versus 1.0M(38.1% and 31.6%) sucrose(P < 0.05). But survival rates with 2M glycerol and 2M ethylene glycol were not significantly different. Transfer thawed embryos frozen with 2M glycerol and 2M ethylene glycol by 0.5M sucrose resulted in birthrates of 40.9% and 40.0%, respectively compared to 26.3% and 27.2%, respectively, for 1.0 M sucrose(p<0.05). This was 56.0% for fresh control.
마늘 흑색썩음균핵병 방제 길항세균 Burkholderia pyrrocinia CAB08106-4의 대량배양 조건
이동국 ( Dong Guk Lee ),이은숙 ( Eun Sook Lee ),김정석 ( Jeong Seok Kim ),백철기 ( Cheol Ki Baek ),박매솔 ( Mae Sol Park ),박은희 ( Eun Hee Park ),이석희 ( Suk Hee Lee ),정창국 ( Chang Kook Chung ) 한국균학회 2013 韓國菌學會誌 Vol.41 No.1
Burkholderia pyrrocinia CAB08106-4 was parceled out from the Chungnam Agricultural Research and Extension Center, Korea to evaluate the antagonistic activity against garlic white rot caused by Sclerotium cepivorum. The optimum cultural conditions including temperature, pH, enzyme activity, carbon and nitrogen sources were determined. The optimum culture conditions of B. pyrrocinia CAB08106-4 were 28oC, 150 rpm and pH 7. Chitinase only showed activity among several tested enzymes. The highest cell growth was obtained with 1% glucose and 0.1% (NH4)2SO4, respectively.
살충제 Flubendiamide의 복숭아 품종에 따른 잔류양상
김효영 ( Hyo Young Kim ),황정인 ( Jeong In Hwang ),이은향 ( Eun Hyang Lee ),전영환 ( Young Hwan Jeon ),김지환 ( Ji Hwan Kim ),안지운 ( Ji Woon Ahn ),박현주 ( Hyun Ju Park ),정창국 ( Chang Kook Chung ),김산영 ( San Yeong Kim ),이 한국환경농학회 2012 한국환경농학회지 Vol.31 No.2
표면의 형태가 다른 복숭아 3품종을 선정하여 살충제 flubendiamide의 잔류양상을 조사하고 또한 전착제 사용에 따른 잔류량을 조사하였다. 복숭아 표면의 형태는 현미경으로 관찰한 결과 창방, 월미 품종의 순으로 털이 많았으며, 천홍품종은 털이 없는 것으로 나타났다. Flubendiamide의 잔류량은 털이 많은 창방에서 가장 높게 나타나 0.54 mg/kg이었으며, 월미에서 0.43 mg/kg, 그리고 천홍에서 0.10 mg/kg이었다. flubendiamide와 전착제 polyoxy ethylene methylpoly siloxane를 함께 처리를 하였을 때, 각 품종별 복숭아에 대한 농약 잔류량은 창방에서는 전착제의 사용유무에 관계없이 0.55 mg/kg로 거의 변화가 없었으며, 월미에서는 0.53mg/kg으로 0.10 mg/kg 증가하였다. 천홍에서는 0.48mg/kg으로 나타나 전착제의 사용으로 잔류량이 4.8배 증가되었다. 이러한 결과는 전착제의 사용이 표면에 털이 있는 품종에서는 농약의 잔류량을 증가시키지 않았으나, 표면에 털이 없는 품종에서는 잔류량을 증가시키는 것을 보여주었다. BACKGROUND: This research has investigated the residue patterns of insecticide flubendiamide on three species of peaches with different surface forms, and the residue amounts of them when mixed with a spreader. METHODS AND RESULTS: Pesticide used for field application on peaches was 20% flubendiamide of suspension concentrate (SC) and was sprayed at a recommended rate. The residue amounts of flubendiamide in peach were analyzed by HPLC equipped with UV detector. After the observation with a microscope, the rank of fuzz amount on peach`s surface was Kurakatawase, Wolmi in descending order and Cheonhong did not have any fuzz. The residue amounts of flubendiamide were 0.54mg/kg for Kurakatawase, 0.43 mg/kg for Wolmi and 0.10mg/kg for Cheonhong, respectively. When flubendiamide was used with a spreader, polyoxy ethylene methylpoly siloxane, the residue amount for Kurakatawase barely changed at 0.55 mg/kg regardless of mixing with a spreader, and at 0.53 mg/kg for Wolmi. In Cheonhong, the residue amount was 0.48 mg/kg, which increased by 4.8 times due to the use of a spreader. CONCLUSION: This result indicates that the residue amounts of flubendiamde were affected by the surface forms of peaches, and in the presence of a spreader the residue amount did not increase in fuzzy species, but was affected greatly for species without fuzz.