• Plant Resources
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• 제2권2호
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• pp.96-112
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• 1999

This study was to estimate and complete the flora of herbaceous plants found in Mt. Kyeryong National Park, Mt. Bomoon, and Mt. Shikjang in Taejon Korea. This research was conducted from April 1995 to August 1998. Herbaceous vascular plants were composed of 76 families,336 genera,574 species,4 subspecies, 105 varieties and 9 forms, totaling 691 taxa. The useful resource plants were categorized as edible plants (45.4%), medical plants (31.1%), pasture plants (28.7%), ornamental plants (16.4%) and industrial plants (1.6%).

• Molecules and Cells
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• 제37권6호
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• pp.435-440
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• 2014

Hemodynamic shear stress, the frictional force acting on vascular endothelial cells, is crucial for endothelial homeostasis under normal physiological conditions. When discussing blood flow effects on various forms of endothelial (dys)function, one considers two flow patterns: steady laminar flow and disturbed flow because endothelial cells respond differently to these flow types both in vivo and in vitro. Laminar flow which exerts steady laminar shear stress is atheroprotective while disturbed flow creates an atheroprone environment. Emerging evidence has provided new insights into the cellular mechanisms of flowdependent regulation of vascular function that leads to cardiovascular events such as atherosclerosis, atherothrombosis, and myocardial infarction. In order to study effects of shear stress and different types of flow, various models have been used. In this review, we will summarize our current views on how disturbed flow-mediated signaling pathways are involved in the development of atherosclerosis.

• Journal of Plant Biology
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• 제29권1호
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• pp.19-40
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• 1986

A study on the species description, enumeration and interspecific relationships of genus Filipendula was undertaken for four Korean and two Japanese species. The use of scanning electron miroscope(SEM) has made possible a detailed study of foliar trichomes, pollen grains and fruit surface features. A new method for the preparation of SEM samples was developed in this study. Filipendula glaberrima, F. formosa, and F. korean were reliable endemic species. Among them, F. glaberrima shares many characteristics with F. formosa. F. gloaberrima can be divided into tow types based on leaf, seed, flower and pollen characters. Type I is characterized by ciliated fruits, many branched vascular bundles on the petal, dense trichomes on the leaf vein of abaxial surface, and many foveolate pollen surface. Type II possesses glabrous fruits, a few vascular bundles on the petal, rare trichomes on the leaf vein and a few foveolate pollen surface. The significant taxonomic characteristics in the classification of genus Filipendula are their lengths of fruit stalks, the densities of marginal trichomes of fruits, and textures of stipules.

• Journal of Plant Biology
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• 제11권4호
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• pp.30-36
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• 1968

The vascular flora of grasslands in Mt. Kumhak, Moonheri, Sungilkyo and Kosukjong area located at Chulwon were composed of 54, 57, 45, and 39 species, the most impotant of which were Arundinella hirta and Miscanthus purpurascens. These two species contributed greatly to the standing crop of live material was in excess of 142g/$m^2$ throughout the growing season. The peak standing crop of 332.4g/$m^2$ was reached in July under flooded conditions largely as a result of the growth of Miscanthus Purpurascens and Arundinella hirta. The net production of organic matter occurred largely throughout the growing season. The net productivity of the vascular component of community was in excess of 27.3g/$m^2$ for one growing season.

• Journal of Plant Biology
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• 제33권3호
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• pp.153-158
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• 1990

The structural changes in the vascular cambium and secondary xylem Alnus hirsuta (SPACH) Rupr. have been investigated in relation to the girth of the tree. The fusiform initials gain a gradual size increase and later remain more or less constant in their length and width. The width of the ray initials remain constant but their heights gradually increase before becoming almost constant. Xylem elements undergo considerable changes in their dimension with the growing girth of the tree and their trends of structural changes are the same as those of cambium.

• Molecules and Cells
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• 제41권3호
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• pp.207-213
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• 2018

Hypoxic culture is widely recognized as a method to efficiently expand human mesenchymal stem cells (MSCs) without loss of stem cell properties. However, the molecular basis of how hypoxia priming benefits MSC expansion remains unclear. In this report, our systemic quantitative proteomic and RT-PCR analyses revealed the involvement of hypoxic conditioning activated genes in the signaling process of the mitotic cell cycle. Introduction of screened two mitotic cyclins, CCNA2 and CCNB1, significantly extended the proliferation lifespan of MSCs in normoxic condition. Our results provide important molecular evidence that multipotency of human MSCs by hypoxic conditioning is determined by the mitotic cell cycle duration. Thus, the activation of mitotic cyclins could be a potential strategy to the application of stem cell therapy.

• Journal of Plant Biotechnology
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• 제3권2호
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• pp.45-57
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• 2001

Trees have the ability to undergo secondary growth and produce a woody body. This tree-specific growth is affected by the secondary vascular system and the developmental continuum of secondary phloem and xylem. Secondary growth is one of the most important biological processes on earth. Considering its economic and environmental significance, our knowledge of tree growth and development is surprisingly limited. Trees have received little attention as model species in plant science, as most Plant biology questions can be best addressed by using herbaceous model species, such as Arabidopsis. Furthermore, tree biology is difficult to study mainly due to the inherent problems of tree species, including large size, long generation time, large genome size, and recalcitrance to biotechnological manipulations. Despite all of this, one must rely on trees as models to study tree-specific questions, such as secondary growth, which cannot be studied effectively in non-woody model species. Recent advances in genomics technology provide a unique opportunity to overcome these inherent tree-related problems. Several groups, including our own, have been successful in studying the biology of wood formation with a variety of hardwood and softwood species. In this article, 1 first review the current understanding of tree growth and then discuss the recent attempts to fully explore and realize the potential of molecular biology as a tool for enhanced understanding of secondary growth.

• International Journal of Industrial Entomology and Biomaterials
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• 제48권1호
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• pp.48-58
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• 2024

Reports of a global decline in pollinator populations, especially mason bees, have raised concerns regarding the maintenance of pollination interactions. Although addressing local factors causing bee decline is a potential mitigation strategy at the landscape scale, regional rates and high-latitude threats to bee diversity are unclear. We investigated the distribution of mason bees (Osmia. spp. (O. pedicornis, O. corniforns, O. taurus, and O. satoi) and measured species richness and species ratios at regional, latitudinal, and altitudinal scales. We examined the association between bee species richness and three putative environmental conditions: high-low, altitude-dependent, and latitude-dependent. The species richness of the O. pedicornis bee was the highest and it was found between latitudes 35° and 37°, and at 500-600 m in both the northern and southern hemispheres, showing an inverse latitudinal gradient of bee species richness in South Korea. Mason bee species richness and global climate are important predictors of flowering plant diversity. Climate change threatens bee and vascular plant diversity; however, the overlap between bee abundance and plant diversity can be improved by employing suitable conservation strategies.

• 한국자원식물학회지
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• 제18권3호
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• pp.479-489
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• 2005

거제도의 인근도서 지심도, 내도, 윤돌도 식물상 조사는 2004년 3월, 6월, 8월 총 3번에 걸쳐 식물상을 조사하였다. 본 조사 결과 관속식물은 지심도 64과 114속 121종 10변종 131분류군, 내도 53과 79속 5변종 81분류군, 윤돌도 14과 15속 15종 1변종 16분류군으로 총 72과 140속 149종 14변종 1품종 164분류군이 동정하였다. 멸종위기식물은 관찰되지 않았으나, 한국특산식물은 거제딸기, 섬쥐똥나무 등 2과 2속 1종 1변종 총 2분류군이 확인되었다. 식물구계학적 특정식물은 가는쇠고사리, 섬쥐똥나무, 나도생강, 털머위, 생달나무, 센달나무, 남오미자, 멀꿀, 팔손이 등을 포함 25과 33속 36종 2변종 38분류군이 관찰되었다. 그 외에 귀화식물은 소리쟁이, 자리공, 토끼풀, 까마중, 선개불알풀, 주홍서나물, 개망초, 별꽃아재비등 6과 10속 10종으로 우리나라 전체 귀화식물종 284종에 대한 도시화지수(U.I) 및 귀화율은 $3.52\%$와 $6.1\%$이다. 조사지역은 장승포와 옥포 등 가까운 거리에 있고 자연경관이 뛰어나 방문객의 수가 갈수록 급증할 것으로 예상되어 귀화식물의 종류와 수는 앞으로 더욱더 늘어날 것으로 전망된다. 또한 낚시터로 많은 사람들의 출입이 빈번한 곳이다. 이에 따른 식생이 파괴될 위험이 크므로 조사지역의 상록활엽수림에 대한 보존대책이 요망된다.

• 환경생물
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• 제27권1호
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• pp.88-94
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• 2009

안토시아닌(Anthocyanin)은 플라보노이드계 화합물의 한 부류로 항산화, 항암 및 항궤양, 항당뇨, 중금속해독, 시력보호, 콜레스테를 저하 등의 다양한 생리활성을 가지는 것으로 보고되어 있다. 죽상경화과정은 염증성 사이토카인의 분비 또는 혈관손상으로 인한 백혈구의 부착과 이동을 통해 시작된다. 본 연구는 이러한 죽상경화의 초기과정에서 안토시아닌 혼합물 중 single compound인 delphinidin chloride (DC) 인간혈관 내피세포주(HUVEC, human umbilical vein endothelial cell line)에서 백혈구 부착과 관련이 있는 ICAM-1 (Intraceliular Adhesion Molecule-1)과 VCAM-1 (Vascular Adhesion Molecule-1) 발현에 미치는 영향에 대해 조사하였다. 세포독성이 없는 농도에서 TNF-$\alpha$에 의해 유도된 혈관 내피세포에 대한 단핵구의 부착정도를 측정하기 위해 monocyte-endothelial cell adhesion assay와 광학현미경을 이용한 형태학적 관찰을 한 결과 DC가 처리농도 의존적으로 부착을 억제하였다. 내피세포로부터 TNF-$\alpha$에 의해 유도된 세포부착 분자인 VCAM-1과 ICAM-1의 발현에 대한 영향을 western blot analysis 및 RT-PCR방법으로 비교 분석한 결과 VCAM-1과 ICAM-1의 단백질과 mRNA수준에서의 발현이 농도 의존적으로 감소되었다. 이러한 결과들을 종합해 볼 때 안토시아닌 중에서 DC를 실험한 결과 DE는 TNF-$\alpha$에 의해 유도된 내피세포의 ICAM-1과 VCAM-1 발현 억제효과를 확인할 수 있었다.