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특집: 사료내 항생제 첨가금지에 따른 대처방안 -무항생제 육계사육시 질병발생 동향과 관리방법
장형관,Jang, Hyeong-Gwan 한국육계협회 2011 월간 닭고기 Vol.17 No.6
지난 5월 13일 '항생제의 사료내 첨가금지 대응방안'이라는 주제로 한국가금학회 춘계국제심포지움이 열렸다. 필자는 이날 연사로 참여했으며 양계산업의 다양한 분야에 종사하는 분들이 참석하여 심포지움이 진행되는 내내 많은 관심을 보이는 모습을 보며, 현재 우리나라 양계산업에서 항생제 사료내 첨가금지 문제'가 핫이슈임을 새삼 느낄 수 있었다. 실제 금년 7월부터는 일부 항원충제제를 제외한 사료 내 항생제 첨가가 전면 금지되면서 발생하게 될 현장문제에 대해 산업 전반에서 우려하는 목소리가 클 것으로 예상되며, 그에 대한 대책방안 수립이 시급한 상황임을 다시금 절감할 수 있었다. 따라서 본고에서는 무항생제 사육시 발생하는 문제점에 대해 살펴보고 그 관리방법에 대해 고찰하고자 한다.
마렉병 바이러스의 분자적 병리기전과 증가하는 병원성에 대한 제어 방안
장형관,박영명,차세연,권정택,Jang, H.K.,Park, Y.M.,Cha, S.Y.,Kwon, J.T. 한국가금학회 2007 韓國家禽學會誌 Vol.34 No.1
Marek's disease (MD) is caused by a ubiquitous, lymphotropic alphaherpesvirus, MD virus (MDV). MD has been a major concern in the poultry industry due to the emergence of increasingly virulent strains over the last few decades that were isolated in the face of comprehensive vaccination. MD is characterized by a variety of clinical signs, amongst them neurological symptoms, chronic wasting, and most notably the development of multiple lymphomas that manifest as solid tumors in the viscera and musculature. Much work has been devoted to study MD-induced oncogenesis and genes involved in this process. Among the many genes encoded by MDV, a number have recently been shown to affect the development of tumors in chickens, one protein directly causing transformation of cells (Meq) and another being involved in maintaining transformed cells (vTR). Other MDV gene products modulate and are involved in early lytic in vivo replication, thereby increasing the chance of transformation occurring. In this review, specific genes encoded by MDV that are involved in the initiation and/or maintenance of transformation were briefly summarized, and limits of current vaccination and new control strategies against MD, particularly how modem molecular biological methods may be used to improve strategies to combat the disease in the future, were discussed.
와상전류를 응용하여 지진 충격흡수 장치를 위한 초전도 자기부상 안정화 향상
장형관,송준후,아시프 마흐무드,김세빈,양찬호,성태현,Jang, Hyung-Kwan,Song, Daniel,Mahmood, Asif,Kim, Se-Bin,Yang, Chan-Ho,Sung, Tae-Hyun 한국초전도학회 2011 Progress in superconductivity Vol.12 No.2
Pinning force is the mechanism between a superconductor and a permanent magnet and it provides a stable levitation. However, when external force greater than the pinning force such as the earthquake exerts, the levitated object may lose the levitating characteristic. In order to achieve more stabilized levitation, the copper plate was inserted in between a superconductor and permanent magnets. And by applying the eddy current effect caused from the relationship between a copper plate and permanent magnets, more stabilized levitation can be established. In this study, an optimized design was found based on various configurations of permanent magnet's polarity, thickness and area of copper plate, and the gap distance between copper plate and permanent magnet. As results, higher eddy current value was obtained at where the change of polarity exists in permanent magnet configuration, and the highest eddy current value was observed at the copper plate thickness of 5 mm and the area of 80 mm ${\times}$ 80 mm. From the resulted optimized conditions above, which are 7 mm gap distance between a superconductor and permanent magnets and 80 mm ${\times}$ 80 mm ${\times}$ 5 mm dimension of a copper plate, the stiffness value was 65 % increased comparing to without any copper plate insertion.
장형관 ( Hyung Kwan Jang ),송희종 ( Hee Jong Song ) 한국가축위생학회 2005 韓國家畜衛生學會誌 Vol.28 No.1
More than 30 years have elapsed since the first report of the International Committee on Taxonomy of Viruses(ICTV) was published in 1971. Since that publication, the ICTV recognizes about 1,550 virus species, but some 30,000 virus strains and isolates are being tracked by virologists in different fields of biology. The ICTV is the "international court" of experts that rules on names and relationships of all virus, but only to the level of species. Virus taxonomy is changing rapidly, with changes ranging from the trivial(use of italics for species names) to profound reorganization driven by the explosion of sequence information. The universal system of viral taxonomy now accepts Linnean-like classification at the levels of order, family, subfamily, genus, and species. The suffix "-virales" identifies an order. Families are identified by the suffix "-viridae", subfamilies are identified by the suffix "-virinae", and genera are identified by the suffix "-virus". The importance of distinguishing subspecies, strains, and isolates in vaccine development, diagnostics, etc. is recognized, but these lower levels are not formally classified by ICTV. This paper mainly introduces taxonomy and classification of animal viruses on the basis of the seventh report of the ICTV edited by Van Regenmortal et al. in 2000.