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Analysis of the vitellogenin gene from the soft tick Ornithodoros moubata
Mari Horigane,DeMar Taylor 한국응용곤충학회 2008 한국응용곤충학회 학술대회논문집 Vol.2008 No.10
Female ticks require a blood meal for vitellogenesis to occur. Vitellogenin (Vg), a precursor of yolk protein, is essential for egg development and Vg synthesis appears to be regulated by ecdysteroids in ticks. To better understand the regulation of Vg synthesis in ticks, the Vg gene was identified from Orinthodoros moubata. OmVg is composed of 5,502 bp encoding a 1,834 aa protein with Vg specific characteristics. OmVg gene showed the highest homology with the hard tick Dermacentor variabilis and was included in the same clade of a phylogenetic tree as the hard tick and crustacean Vg genes. OmVg gene expression was observed in females but not in nymphal stages and during molting. Both mated and virgin females showed OmVg expression approximately 3 days after engorgement. However, as time passed, mated females showed significant increases in OmVg expression whereas virgin females didn’t. OmVg expression is thought to be regulated by ecdysteroids functioning through a complex with an ecdysteroid receptor (EcR) and retinoid X receptor (RXR). EcR and RXR expression increased in both mated and virgin females soon after engorgement. However, ecdysteroid titer only increased in mated females indicating a high titer of ecdysteroids in mated females up-regulates OmVg expression. The OmVg gene was expressed in the fat body and midgut of O. moubata. Further studies are underway to determine other factors that may explain differences between mated and virgin O. moubata females. Understanding the regulation of reproduction in ticks may lead to the development of better mechanisms for controlling ticks and preventing the spread of tick vectored diseases.
Goto, M.,Morio, T.,Kojima, E.,Nagano, Y.,Yamada, Y.,Horigane, A.,Yamada, H. Asian Australasian Association of Animal Productio 2000 Animal Bioscience Vol.13 No.9
Rumination behavior, in vivo digestibility of cell wall constituents, particle size reduction in the rumen, and retention time in the digestive tract of sheep were examined using rice and oat straw as roughage sources. The in sacco digestibility, rumen fermentation, and microbial population and internal adenosine 5-triphosphate (ATP) content were also determined under feeding conditions of high-roughage and high-concentrate diets. Chewing number and time in rumination behavior were higher with rice straw than with oat straw, while the in sacco and in vivo DMD of rice straw were consistently lower than those of oat straw. Rice straw also showed higher frequency of thinner and longer particles in the rumen contents and lower retention time in the whole digestive tract as compared to those of oat straw. Rice straw was more effective to maintain the ruminal pH than oat straw, being reflected in higher internal ATP content of large-type protozoa on the high- concentrate diet. Changes in the ruminal microflora by shifting from the low- to the high- concentrate diet were also different between rice and oat straw.
Facilitating Korean Reconciliation through Constitutional Law
HORIGAN, DAMIEN P. Institute for International Trade and Cooperation, 2009 Asian International Studies Review Vol.10 No.2
This article looks at the so-called Korean Problem or Korean Question from a fresh perspective. Instead of advocating a quick yet costly reunification of Korea along German lines or any specific type of federation, confederation, or commonwealth, a new approach to both Korean reconciliation and possible reunification based on negotiated constitutional change, the symbolic power of constitutions, and the Habermasian concept of constitutional patriotism is proposed. Specifically, the example of the Northern Ireland peace process is presented as an alternative legal model that can be creatively applied to conditions on the Korean Peninsula.
Observations on the South Korean Penal Code
( Damien P. Horigan ) 서울대학교 아시아태평양법연구소 2003 Journal of Korean Law Vol.3 No.2
This article presents an American legal perspective on the ROK Penal Code. The emphasis is on certain sections of the Code that differ dramatically from the mainstream of contemporary American criminal law including several provisions that should be revised in order to strengthen democracy and better protect human rights in South Korea. The article concludes by suggesting some modest changes to the Code in the name of law reform.