• Journal of Veterinary Science
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• 제24권1호
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• pp.5.1-5.16
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• 2023

The H9N2 avian influenza (AI) has become endemic in poultry in many countries since the 1990s, which has caused considerable economic losses in the poultry industry. Considering the long history of the low pathogenicity H9N2 AI in many countries, once H9N2 AI is introduced, it is more difficult to eradicate than high pathogenicity AI. Various preventive measures and strategies, including vaccination and active national surveillance, have been used to control the Y439 lineage of H9N2 AI in South Korea, but it took a long time for the H9N2 virus to disappear from the fields. By contrast, the novel Y280 lineage of H9N2 AI was introduced in June 2020 and has spread nationwide. This study reviews the history, genetic and pathogenic characteristics, and control strategies for Korean H9N2 AI. This review may provide some clues for establishing control strategies for endemic AIV and a newly introduced Y280 lineage of H9N2 AI in South Korea.

• 한국게임학회 논문지
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• 제15권1호
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• pp.7-16
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• 2015

본 실증적 연구의 목적은 게임에서 게이머의 사회적 상호작용을 통해 발현되는 조직시민행동이 게임의 지속 사용의도에 어떠한 영향을 미치는지 알아보고, 게이머의 이타적 행동과 순응적 행동 유도에 대한 학술적, 실무적 시사점을 제공하는 것이다. 이를 위해 조직시민행동 이론을 바탕으로 가설을 설정하였고, 리니지2 게이머 134명을 대상으로 실증 분석을 실시하였다. 분석 결과, 게이머의 조직시민행동인 이타적 행동과 순응적 행동은 게임의 지속 사용의도에 유의미한 영향을 미치는 것으로 나타났다.

• BMB Reports
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• 제33권4호
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• pp.308-311
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• 2000

The interrelationship between the differentiation and expression of mRNA for transferrin in the HL-60 leukemia cell line was studied. Transferrin mRNA was expressed in HL-60 leukemia cells and the amount was 50% of that in the positive control cell line, HepG-2 cells. The expression of $T_f$ mRNA in HL-60 cells was not regulated by IL-1, IL-6 and $TNF-{\alpha}$, respectively. The expression of $T_f$ mRNA in the differentiated cells into a granulocyte lineage by DMSO, or all-trans RA, was up-regulated (160-170% of control cells); whereas, the expression was not regulated in the differentiated cells into a macrophage lineage by PMA. These results suggest that the differentiation to a granulocyte lineage of HL-60 leukemia cells appear to be related with the upregulation of transferrin mRNA expression.

• 수완나부미
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• 제11권2호
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• pp.7-21
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• 2019

• 식물분류학회지
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• 제39권3호
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• pp.135-142
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• 2009

엽록체 rbcL gene의 염기서열과 포자의 형태를 바탕으로 고사리삼과 식물의 계통과 제주고사리삼속의 계통학적 위치를 추정하였다. 엽록체 DNA rbcL 염기서열의 분석 결과 고사리삼과는 뚜렷하게 고사리삼계보 (Botrychioid lineage)와 나도고사리삼계보 (Ophioglossoid lineage)의 두 군으로 구분되었다. 고사리삼계보에 있어 제주고사리삼속(Mankyua)은 Helmintostachys속과 함께 분계의 기저에서 고사리삼속(Botrychium)의 자매분류군으로 분지하였으나, 이들 고사리삼속(Botrychium), 제주고사리삼속(Mankyua), 및 Helmintostachys속 사이의 계통적 유연관계는 결정되지 못했다. 고사리삼속의 경우 Sceptridium아속과 Botrychium아속이 뚜렷한 단계통을 형성하였으나, Botrypus아속에 속한 분류군들은 고사리삼속의 기저에서 다른 고사리삼속 분류군의 자매분류군으로 분지하면서 단계통이 아닌 것으로 밝혀졌다. 나도고사리삼계보를 형성하는 나도고사리삼속(Ophioglossum)의 경우, Ophioglossum아속은 단계통을 형성하였으며, Ophioglossum아속에 대해 Cheiroglossa아속 및 Ophioderma 아속이 차례로 자매분류군으로 분지하였다. 염기서열 계통수, 포자의 형태 및 외부형태의 고찰에 있어 제주고사리삼속은 Helminthostachys와 유사하지만, 계통수에서 patristic distance 뿐 아니라 포자소엽의 형태가 뚜렷이 구분되어 이들 2속은 독립된 속으로 판단된다.

• Asian Pacific Journal of Cancer Prevention
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• 제16권16호
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• pp.7219-7229
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• 2015

Background: Chromosomal aberrations identified in acute lymphoblastic leukemia (ALL) have an important role in disease diagnosis, prognosis and management. Information on karyotype and associated clinical parameters are essential to physicians for planning cancer control interventions in different geographical regions. Materials and Methods: In this study, we present the overall frequency and distribution patterns of chromosomal aberrations in both children and adult de novo B lineage ALL Indian patients using conventional cytogenetics, interphase FISH and multiplex RT-PCR. Results: Among the 215 subjects, cytogenetic results were achieved in 172 (80%) patients; normal karyotype represented 37.2% and abnormal 62.8% with a distribution as follows: 15.3% hypodiploidy; 10.3% hyperdiploidy; 15.8% t(9;22); 9.8% t(1;19); 3.7% t(12;21); 2.8% t(4;11); 2.8% complex karyotypes. Apart from these, we observed several novel, rare and common chromosomal rearrangements. Also, FISH studies using LSI extra-signal dual-color probes revealed additional structural or numerical changes. Conclusions: These results demonstrate cytogenetic heterogeneity of ALL and confirm that the incidence of chromosomal abnormalities varies considerably. To the best of our knowledge, this is one of the largest reported series of cytogenetic investigations in Indian B-lineage ALL cases. In addition, ongoing cytogenetic studies are warranted in larger groups of B-lineage ALL cases to identify newly acquired chromosomal abnormalities that may contribute to disease diagnosis and management.

• 한국발생생물학회:학술대회논문집
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• 한국발생생물학회 2003년도 제3회 국제심포지움 및 학술대회
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• pp.60-60
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• 2003

Embryonic stem (ES) cells have property of self-renewal and can differentiate into the cells of all three primary germ layers. Recently, many growth factors, alteration of culture condition and gene modifications have been used to differentiate mouse and human ES cells into specific cell types. This study was performed to evaluate the differentiation protocol for human ES cells to the endodermal lineage cells. Human ES cells (Miz-hESl ) were cultured on STO feeder layer mitotically inactivated with mitemycin C, and embryoid bodies (EBs) were formed by suspension culture. Differentiation protocol of EBs consisted of three steps: stage I, culture of EBs for 6 days with ITSFn medium; stage II, culture of stage I cells for 8 days with N2 medium ; stage III, culture of stage II cells for 22 days with N2 medium. mRNA levels of the endodermal lineage differentiation genes were analyzed by semi- quantitative RT-PCR. The Oct-4 expression, a marker of the pluripotent state, was detected in undifferentiated human ES cells but progressively decreased after EBs formation. Differentiating human ES cells expressed marker genes of endodermal differentiation and pancreatic islet cells. GATA4, a-fetoprotein, Glut-2, and Ngn3 were expressed in all stages. However, albumin and insulin were expressed in only stage III cells. The human ES cells can be differentiated into endodermal lineage cells by multiple step culture system using various supplements. We are developing the more effective protocols for guided differentiation of human ES cells.

• 한국수학사학회지
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• 제26권2_3호
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• pp.163-176
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• 2013

본 논문은 저자의 선행 연구 결과에 따른 부가적인 연구로 '푸리에 급수의 $\mathfrak{L}^1$-수렴성'에 관한 많은 업적을 남긴 세계적인 수학자인 스타노제빅(Caslav V. Stanojevic)을 중심으로 20세기 후반부터 21세기 초까지(1973-2002) 30년간 그의 연구결과를 순차적으로 고찰하여 푸리에 급수의 $\mathfrak{L}^1$-수렴성 연구자들의 2012년까지 소 계보를 조사한다.

• 디지털콘텐츠학회 논문지
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• 제18권7호
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• pp.1239-1248
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• 2017

국내 게임 시장은 현재 여전히 상승세에 있다. 특히 모바일 게임의 수요가 증가함에 따라 PC 게임이 출시되더라도 모바일 버전의 게임을 개발하는 경우가 늘고 있다. 본 연구에서는 플랫폼 차이에 따른 UI 디자인의 효과적인 방법을 모색하고자 먼저 미디어의 유형을 살펴보고 어포던스 기반의 UI 디자인에 대한 접근을 동일 MMORPG 게임인 PC 기반의 <리니지 2>와 모바일 기반의 <리니지 레볼루션>을 사례로 분석하였다. 게임 플랫폼의 차이는 UI를 생성하는 환경에 따라 물리적 화면의 크기가 다르고 키보드, 마우스 조작과 같은 제어가 스크린을 터치하는 방식의 컨트롤러로 나타날 수 있기 때문에 UI 디자인 방향성에 영향을 미치게 된다. 이와 같은 UI 요소는 어포던스 개념을 기반으로 관찰해보면 향후 UI 디자인의 효과적인 방법을 모색할 수 있을 것이다.

• 한국발생생물학회지:발생과생식
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• 제21권4호
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• pp.467-473
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• 2017

Ascidian embryos have become an important model for embryological studies, offering a simple example for mechanisms of cytoplasmic components segregation. It is a well-known example that the asymmetric segregation of mitochondria into muscle lineage cells occurs during ascidian embryogenesis. However, it is still unclear which signaling pathway is involved in this process. To obtain molecular markers for studying mechanisms involved in the asymmetric distribution of mitochondria, we have produced monoclonal antibodies, Mito-1, Mito-2 and Mito-3, that specifically recognize mitochondria-rich cytoplasm in cells of the ascidian Halocynthia roretzi embryos. These antibodies stained cytoplasm like reticular structure in epidermis cells, except for nuclei, at the early tailbud stage. Similar pattern was observed in vital staining of mitochondria with DiOC2, a fluorescent probe of mitochondria. Immunostaining with these antibodies showed that mitochondria are evenly distributed in the animal hemisphere blastomeres at cleavage stages, whereas not in the vegetal hemisphere blastomeres. Mitochondria were transferred to the presumptive muscle and nerve cord lineage cells of the marginal zone in the vegetal hemisphere more than to the presumptive mesenchyme, notochord and endoderm lineage of the central zone. Therefore, it is suggested that these antibodies will be useful markers for studying mechanisms involved in the polarized distribution of mitochondria during ascidian embryogenesis.