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Effect of Ovarian Extract on Oocyte Maturation and Early Embryonic Development in Pigs
Seul-Gi Yang(Seul-Gi Yang),Jae-Hun Choi(Jae-Hun Choi),Young-Seo Jo(Young-Seo Jo),Ye-Won Kim(Ye-Won Kim),Dong-Mok Lee(Dong-Mok Lee),Hyo-Jin Park(Hyo-Jin Park),Deog-Bon Koo(Deog-Bon Koo) 한국동물보건학회 2022 한국동물보건학회지 Vol.1 No.2
Various factors in the ovary are known to regulate oocyte maturation and hormone secretory functions; however, the effect of ovarian extract (OE) on oocyte maturation and embryonic development in pigs remains unknown. In this study, we first evaluated whether OE supplementation in the in vitro maturation (IVM) medium alters the oocyte maturation capacity by affecting glucose/amino acid metabolites, meiotic maturation, cumulus cell (CC) expansion, and antioxidants. Various OE concentrations (50, 100, 200, 500, and 5000 μg/mL) were included in the IVM medium. Only the oocytes treated with 100 μg/mL OE exhibited an improved meiotic maturation rate when compared with that of the other groups (non-treated group, 78.6 ± 3.0% vs. 100 μg/mL OE-treated group, 81.6 ± 4.3%); however, the difference was not significant. To observe the changes in glucose and amino acid metabolism in the OE-treated oocytes, we measured the amounts of diverse constituents (glucose, lactate, glutamine, and ammonia) in the IVM medium containing OE. Lactate and ammonia levels in the OE-treated group after 44 h of IVM were higher (p < 0.01) than those in the non-treated group. In addition, the expression of the CC expansion factors (Has2 and Tnfaip6) significantly increased (p < 0.05), whereas the mRNA expression levels of antioxidative enzymes (Sod1, Cat, and Gpx1) significantly diminished (p < 0.05) in the OE-treated group. Moreover, mature oocytes treated with 100 μg/mL OE demonstrated increased subsequent embryonic development rates after 144 h of IVM. Thus, the addition of OE in IVM mediums may improve oocyte maturation capacity which could enhance antioxidative enzyme activation, energy metabolism, and expression of the CC expansion factors in porcine oocytes.
Records of the Marsh Grassbird Locustella pryeri sinensis in Korea
Seul-Gi Seo,Se-Young Park,Chang-uk Park,Sook-Young Cho,Seung-Yeon Lee,Gi-Chang Bing,Yang-Mo Kim,Jong-Hyoun Park,Young-Soo Kwon 한국조류학회II 2015 한국조류학회지 Vol.22 No.1
On 16 May 2014, a Marsh Grassbird (1<SUP>st</SUP> summer plumage) was observed at baenanggimi marsh (34°41"21.03"N, 125°25"32.37"E), Heuksan-myeon, Shinan-gun, Jeollanam-do in South Korea. This is the second record of Marsh Glassbird (L. pryeri) in Korea since it has been collected in 1962.
단보 : 배추뿌리혹병균(Plasmodiophora brassicae)의 인공접종을 위한 효율적인 저장조건
양슬기 ( Seul Gi Yang ),박주영 ( Ju Young Park ),서문원 ( Mun Won Seo ),김홍기 ( Hong Gi Kim ) 한국균학회 2015 韓國菌學會誌 Vol.43 No.4
Clubroot, caused by the obligate parasite Plasmodiophora brassicae, is a severe soilborne disease of Brassicaceae. Storage of clubroot gall is important for studies on pathogenicity and race identification. As the current storage method has been used for more than 100 years, a new storage method should be developed and the most efficient way maintaining pathogenicity should be determined. Effects of storage conditions with different storage periods on pathogenicity in galls of kimchi cabbage were examined in a greenhouse. The experiments were performed under six conditions and four temperatures in order to determine the most effective storage conditions for maintenance of pathogenicity. The most effective conditions for clubroot gall storage was the storage of whole gall at -70oC or storage of filtrate at the same temperature through eight layers of gauze after homogenization of the galls.
서슬기(Seul-Gi Seo),이승연(Seung-Yeon Lee),강화연(Hwa-Yeon Kang),권영수(Young-Soo Kwon) 국립공원연구원 2015 국립공원연구지 Vol.6 No.4
We monitored migration status of birds at islands of 3 seas in Korea(Yellow, South, East), focused on National Parks from April 28th 2015 to April 30th 2015. Research sites are Eocheong-do, Heuksan-do and Hong-do in Yellow sea, Geomun-do and Someamul-do in South sea, Ulleung-do in East sea. Total 83 species and 1,459 individuals were observed in Eocheong-do and total 64 species and 682 individuals were observed in Hong-do. Total 76 species, 1,073 individuals were observed in Heuksan-do and Totla 53 species, 576 individuals were observed in Someamul-do. We also observed total 50 species and 1,043 individuals in Geomun-do and total 43 species, 1,531 individuals in Ulleung-do during the spring migratory season of songbird. Bidiversity (H ), Richness (R ) Index and number of species of migratory birds were higher in islands of the Yellow Sea rather than the others. It suggests that islands in the Yellow Sea of Korea play a important role for migratory birds as a stopover site. More information and intensive long-term research have been needed to understand migratory patterns of songbirds in this region. 봄철 철새의 중간기착지로 이용되는 도서지역에서의 철새 도래 현황과 지역적 중요성을 알아보기 위하여 서해안, 남해안, 동해안에서 동시에 모니터링을 실시하였다. 조사 지역은 서해안의 어청도, 흑산도 및 홍도 지역, 남해안의 소매물도, 거문도지역, 동해안의 울릉도 지역이며, 조사 기간은 2015년 4월 28일부터 30일까지 3일간 실시하였다. 조사결과 어청도에서 총 83종 1,459개체, 홍도에서 총 64종 682개체, 흑산도에서 총 76종 1,073개체가 기록되었으며, 소매물도에서 총 53종 576개체, 거문도에서 총 50종 1,043개체, 울릉도에서 총 43종 1,531개체를 확인하였다. 서해안의 어청도에서 종수, 종다양도 및 종 풍부도가 가장 높게 나타났고 그 다음으로는 흑산도, 홍도 순이었다. 철새의 봄철 이동에 있어 서해안이 중요한 중간기착지로 이용되고 있는 것으로 판단된다. 중간기착지는 철새들의 이동에 있어 매우 중요한 지역으로 앞으로도 지속적인 장기 모니터링을 통하여 주요 도서지역 관리 및 서식지 보전에 대한 기초자료 축적이 필요하며, 철새의 이동경로 파악을 위해 가을철에도 도서지역 동시모니터링을 실시해야할 필요가 있다.
한국산 야생 청둥오리의 카드뮴(Cd)과 납(Pb) 오염
서슬기(Seul-Gi Seo),신용운(Yong-Un Shin),이두표(Doo-Pyo Lee) 한국조류학회II 2011 한국조류학회지 Vol.18 No.2
조류는 서식지와 식성이 다양하여, 환경오염의 지표 생물로서 중금속 오염 모니터링에 이용되고 있다. 본 연구는 야생 청둥오리를 대상으로 독성원소인 카드뮴(Cd)과 납(Pb)의 조직 축적농도를 파악하고 환경오염 모니터링의 위한 기초자료를 제공하고자 하였다. 분석결과 청둥오리에서 카드뮴(Cd) 평균농도는 신장(1.19㎍/g)과 간(0.37㎍/g)에서 높고, 뼈(0.11㎍/g)와 근육(1.17㎍/g)에서 낮게 나타났다. 납(Pb)은 신장(1.01㎍/g)과 뼈(0.6㎍/g)에서 높고, 근육(0.2㎍/g)과 간(0.3㎍/g)에서 낮았다. 본 연구에서 청둥오리의 카드뮴(Cd)과 납(Pb)의 농도는 모두 비오염수준으로 간에서 카드뮴(Cd) 3㎍/g 이하, 신장에서 카드뮴(Cd) 8㎍/g 이하, 간에서 납(Pb) 3㎍/g 이하에 해당하는 것으로 나타났다. Birds are used for the heavy metal contamination monitoring as the indicator of the environmental contamination because of their various habitat and food habit. This study focused on Cd and Pb concentrations and their tissue distributions of wild mallards (Anas platyrhynchos) to provide reference data in the environmental monitoring of heavy metals. In wild mallard, mean Cd concentration was high in kidney (1.19㎍/g) and liver (0.37㎍/g), and low in bone (0.11㎍/g) and muscle (1.17㎍/g). The mean concentration of Pb was high in kidney (1.01㎍/g) and bone (0.6㎍/g), and low in muscle (0.2㎍/g) and liver (0.3㎍/g). In this study, the concentrations of Cd and Pb were at background level showing <3㎍/g in liver Cd, <8㎍/g in kidney Cd and <6 ㎍/g in liver Pb.
Trends of Epilepsy-Related Mortality in South Korea
Seul Gi Moon,Jung-Kyeom Kim,Seo-Young Lee,Hyun Kyung Kim 대한신경과학회 2023 Journal of Clinical Neurology Vol.19 No.2
Background and Purpose Epilepsy increases the risk of death in affected individuals of any age. We aimed to determine the mortality caused by epilepsy and its time trends in Korea. Methods We obtained population and cause of death data between 1993 and 2019 from Statistics Korea. We identified death caused by epilepsy or status epilepticus. We calculated the crude mortality rate (CMR), age-specific mortality rate, age-standardized mortality rate (ASMR, corresponding to epilepsy-related deaths per 100,000 persons in the general population), and the proportional mortality (PM, corresponding to the proportion of epilepsy-related deaths among all-cause deaths). Results In 2019, 471 deaths were caused by epilepsy (CMR=0.92), accounting for 0.16% of all deaths in that year. The age-specific mortality rate increased with age, up to 7.01% among individuals aged 80 years and older, while the PM was the highest (3.80%) among individuals aged 5–14 years, which decreased with age. Between 1993 and 2019, the CMR, ASMR, and PM peaked in 2002, and the CMR then rebounded after the trough in this trend in 2011 while the ASMR continued to decrease, and the PM became relatively stable from 2011. Starting in 2005, the age-specific mortality rate for epilepsy had an increasing tendency over time among those aged 75 years or older, and a decreasing tendency in the younger age groups. Conclusions A declining tendency of mortality from epilepsy was found in the overall population of Korea over recent decades. However, epilepsy is a notable cause of death in children, and epilepsy-related mortality is increasing in the elderly population.