• Title/Summary/Keyword: 최상호(崔尙虎)

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Mixed infection of bovine papillomavirus and parapoxvirus in dairy cattle with vesidle-like lesions (유우에서 발생한 수포양 병변에서 bovine papillomavirus 와 parapoxvirus 혼합감염)

  • Lyoo, Young S;Kang, Yung-bai;Chang, Chung-ho;Moon, Oun-gyong;Choi, Sang-ho;Park, Joong-won
    • Korean Journal of Veterinary Research
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    • v.38 no.2
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    • pp.353-358
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    • 1998

  • A mysterious disease with vesicle-like nodules in dairy cattle udder has been drawn attention to the foreign animal disease expert at the National Veterinary Research Institute. Immediately dispatched foreign animal disease expert, pathologist and regional veterinary officials executed quarantine nearby affected farm area to prevent transmission of the pathogen which was possibly contagious vesicular disease agents in domestic animals such as FMD or SVD. Proper samples were collected for the laboratory examination. Vesicle-like lesions were only detected in lactating dairy cattle and no distinct clinical signs have been observed in affected animals. Parapox and papillomavirus particles have been demonstrated on electromicroscopical examination from nodular samples of udder lesions of the dairy cattle. Characteristic papilloma virus particles with 55nm in diameter and parapoxvirus with 150nm in diameter and 350nm long oval shape particles were detected and confirmed by embryonated chicken egg inoculation.

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The Effects of Centrifugal Casting Conditions on the Structure and Mechanical Properties in Fabrication Development of Super Heat-Resisting Steel Pipe of HP Alloy Modified with Nb (Nb을 첨가한 HP 초내열강관의 제조개발에 필요한 원심주조 조건이 조직과 기계적성질에 미치는 효과)

  • Choi, Sang-Ho
    • Journal of Korea Foundry Society
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    • v.14 no.6
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    • pp.566-575
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    • 1994

  • The effects of varying the pouring temperature and the die preheating temperature in producing centrifugally cast HP alloy modified with Nb was evaluated on the basis of the resultant macrostructure, microstructure and hardness of these castings. Increased die preheating temperatures and pouring temperatures resulted in an increase in the thickness of the columnar dendritic zone, the primary and secondary dendrite arm spacing and the thickness of the zone of porosity at the casting I.D.(inner diameter). Lower die preheating temperature and pouring temperatures result in increased grain fineness and an increased zone of equiaxed grains. A higher hardness was achieved toward the casting O.D.(outer diameter) compared to the casting I.D., attributable to alloy segregation toward the casting I.D. and segregation differences resulting from reduced solidification cooling rates toward the casting I.D. Also, a higher hardness was realized at the cold end of the casting attributed to a more uniform distribution of carbides.

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