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임신 Rat 난소에 있어서 Progesterone 이화효소 , 20α- Hydroxysteroid Dehydrogenase 활성의 분포
이병오,윤창현,성환후,오석두 한국축산학회 1995 한국축산학회지 Vol.37 No.1
The enzyme 20α-hydroxysteroid dehydrogenase(20α-HSD) plays a key role in the conversion of progesterone to the biological inactive steroid, 20α-hydroxypregn-4-en-3-one(20α-dihydroprogesterone; 20α-OHP). This study was carried out to investigate the activity of 20α-HSD in the rat ovary during pregnancy. Wistar Immamichi rats were impragnated by mating with the same strain of male rats. Concentrations of progesterone in the serum during pregnancy were higher from Day 12 to 18 than that of early pregnancy but dramatically decreased on day 21. Concentration of 20α-OHP was similarly low from day 6 to 18 of pregnancy and increased on Days 20 and 21. The total activity of ovarian cytosolic 20α-HSD was high on day 5 and 21, and decreased from day 10 to 18 of pregnancy. When ovarian 20α-HSD activity on day 5 of pregnancy was separated into HSD-1 and HSD-2 by DEAF-Toyopearl anion exchange chromatography, HSD-I activity was higher than HSD-2. This indicated that two isozymes of 20α-HSD(HSD-1 and HSD-21 may play an important role in the maintenance of pregnancy and the regulation of ovarian function.
李炳旿 東亞大學校 大學院 1984 大學院論文集 Vol.9 No.-
About one third of Korean beef supply is accounted for by the imported beef form Australia. From this point of view, it can be easily expected that Korean beef industry is influenced by Australian beef producing situations directly or indirectly. In order to protect Korean beef producers and consumers from price instabilities derived from disequilibria of beef demand and supply, it is very important to study on the Australian beef industry. The objective of this study is to identify the structural characteristics of beef production and trade in Australia. The results of this study can be summarized as follows : 1. Beef cattle production in Australia is generally part of a mixed farming enterprise in combination with wheat or sheep. This spreads risks from heavy export dependence and frequent droughts. 2. Beef cattle industry has four main production and fattening systems such as Breed Vealers, Breed Fats, Breed Stores, and Fatten Stores. Breed Vealers and Breed Fats constitute about 50 percent of the national herd. 3. In 1981∼82, materials, services, cattle purchases, and hired labor accounted for 36 percent, 21 percent, 17 percent, and 8 percent of the total cash costs per operation, respectively. Farm cash operating surplus of beef-only operations recorded about 11 thousand dollars in this period. 4. There are essentially four ways in which Australian beef producers can dispose of their animals such as Auctions in Saleyards, Paddock Selling, Weight and Grade, and Direct Kill or Consignment Selling. Two thirds of cattle are sold by open auction systems. 5. At the present time Australian feedlots are heavily depended upon Japanese market in grain-fed beef exportation. Average fattening period of Australian feedlots is 3 months. There are two types of feedlots such as seasonal type and permanent type. 6. More than half of Australia's export beef goes to the United States. Other substantial export markets are Japan, Canada, and Korea. Changes in the U.S. beef market thus have a large impact on nearly all Australian beef producers. Recently the Australian beef industry makes an effort to promote export diversification policies.
이병오,최황,강인중,김기영,이호일,김정표,이보인,김병욱,조세현,최규용,정인식,차상복 대한소화기내시경학회 2003 Clinical Endoscopy Vol.27 No.3
Ischemic colitis can be caused either by vascular or colonic wall factor or by both. Shunting of blood away from the mucosa may contribute to ischemia of the colon, but the mechanism of ischemia is not known. Ischemic colitis precipitated by colonoscopy has rarely been reported. Potentially air insufflation or mechanical effect during colonoscopic examination can cause ischemic colitis as a colonic wall factor. Recently, we experienced a case of ischemic colitic, which had been developed several hours after colonoscopic polypectomy. So we report this case with brief review of literature. (Korean J Gastrointest Endosc 2003;27:162-165) 허혈성 대장염의 원인은 다양하며, 혈관측 인자와 장관측 인자의 상호 작용으로 일시적 허혈성 변화가 나타난다. 드물게 대장내시경 검사 중에 과도한 송기나 기계적 효과도 장관측 인자로 작용하여 허혈성 대장염을 일으킬 수 있다. 저자들은 대장내시경 용종절제술 수시간 뒤에 발생한 복통, 혈변, 그리고 설사를 주소로 내원한 49세 남자 환자에서, 추적 대장내시경 검사를 실시하여 허혈성대장염을 진단하고 보존적 치료 후 호전된 증례를 경험하여 문헌 고찰과 함께 보고한다.