• Korean Journal of Plant Taxonomy
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• v.43 no.1
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• pp.1-11
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• 2013

Pollen morphology of 20 species of Euphorbioideae and one from Crotonoideae was examined with light, scanning and transmission electron microscopy. The pollen morphology presented here did not support the monophyly of Euphorbioideae, and the unique characters of tribe Stomatocalyceae such as absence of aperture margins, and thick and continuous endexine suggest the exclusion of Stomatocalyceae from Euphorbioideae which is in accordance with previous phylogenetic studies and wood anatomical data. Aforementioned pollen features in this tribe support that it is closely related to Acalyphoideae. Two subtribes of Stomatocalyceae were well recognized in terms of pollen morphology: Hamilcoinae includes species with reticulate or microreticulate exine patterns, and Stomatocalycinae includes those with perforate patterns with small supratectal elements. Three subtribes of Euphorbieae, classified in terms of pollen morphology, were further divided into three different types including perforate in Euphorbiinae, microreticulate in Neoguillauminiinae and reticulate in Anthosteminae, strongly supporting the Webster's subtribal system. Hureae and Hippomaneae, having perforate sculpturing pattern with smooth margo, were similar in pollen morphology. Especially, the presence of small supratectal elements in Hura crepitans pollen suggests the close relationships with Excoecaria species of tribe Hippomaneae. According to the previous studies, unique intine thickness along the aperture margin in Euphorbieae was not reported elsewhere in Euphorbiaceae. However, in this study we found the same intine thickness along the aperture margin in Maprounea brasiliensis and Hura crepitans. We hypothesize that the similar intine thicknesses found in Euphorbieae and above two species are the evidence of close relationships among them.

• Applied Microscopy
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• v.11 no.1
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• pp.39-50
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• 1981

An electron microscopical observation was carried out to compare the general shape of the mast cells and structures of granules inside the cells in the stomach of 5 species in 3 orders of Mammals. In convenience, the granules in the cytoplasm were abbreviated as follows: 1) Homogeneous granule, GR1 2) Particulate granule, GR2 a. Dark dense particulate granule, GR2-1 b. Less dense particulate granule, GR2-2 3) Reticular granule, GR5 a. Dark dense reticular granule, GR5-1 b. Light dense reticular granule, GR5-2 In Mammalia including goat, dog, cat, and hamster, most of cytoplasmic organelle were Golgi apparatus and mitochondria, and most of the cytoplasmic granules were highly densed GR1and GR2. However GR5-1 and GR5-2 appeared in guinea pig while one side sunken or crescent-like types occured in both dog and guinea pig. All mast cells were oval or spindle with cytoplasmic processes around the cell. There was also found vacuoles and vesicles in these cells. These results demonstrated that there was a morphological difference between species of vertebrate in the mast cells and their cytoplasmic granules. It was also suggested that a variety of structures of granules were closely related with the composition (histamine, heparin, serotonin, hyaluronic acid etc.) and mature of the granules.

• Applied Microscopy
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• v.27 no.3
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• pp.295-308
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• 1997

Liver tissues were taken from rats 20 min after administration of dehydrocholic acid and biligrafin, fasted for 8 days, and bile duct ligation for 48 hr. And the zonulae occludentes around the bile canaliculi were investigated by the freeze fracture method. In the normal rats, the zonulae occludentes showed networks consisting of one to four strands in many regions. After administration of dehydrocholic acid, the depth of zonulae occludentes were increased and networks consist of six to nine strands. The zonulae occludentes, however, were disorganized, and strands were reduced after administration of biligrafin. In the fasting rats, the zonulae occludentes showed one or two strands which were loosely linked. After ligation of bile duct, the zonulae occludentes were disorganized, and strands were reduced or still in a state not to be reduced. The strands were interrupted by gaps or linear particles in all the groups, especially in the biligrafin and the ligation. The free ends were remarkable in the fasting group and contact or surround the lateral gap junctions in the dehydrocholic acid group. The discontinuities and free ends of strands were also encountered in the normal group, thus suggesting that the barrier is not complete even in the normal state. The aggregation of particles appeared within the meshwork of zonulae occludentes in all the group, except for the ligation. From the evidence, it is assumed that zonulae occludentes are labile, differ in the structure according to the situation of bile canaliculi and show regional alterations even in the same bile canaliculi, that zonulae occludentes are affected by mechanical stress or certain other factors, and that there is a correlation between the strands and particle aggregations in association with the alteration of zonulae occludentes.

• Ecology and Resilient Infrastructure
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• v.1 no.2
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• pp.68-81
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• 2014

In this study, the numerical simulation regarding the process and characteristics of topography change due to the vegetation recruitment and growth was carried out by adding the vegetation growth model to two-dimensional flow and sediment transport models. The vegetation introduction and recruitment on the condition for developing an alternate bar reduced the bar migration. The vegetated area and channel width changes were more significantly influenced by changes in upstream discharge rather than the duration of low flow. When the upstream discharge decreased, the vegetation area increased and the channel width decreased. The vegetation introduction and recruitment on the condition for developing a braided channel significantly influenced the characteristics of topography changes. In the braided channel, vegetation reduced the braided index, and when the upstream discharge decreased significantly, the channel topography was changed from the braided channel to the single channel. The vegetation area decreased as the upstream discharge increased. The channel width decreased significantly after the vegetation was introduced and it also decreased as the upstream discharge decreased. It was confirmed through the numerical simulation that a decrease in flood discharge accelerated the vegetation introduction and recruitment in the channel and this allowed to confirm its influence on the characteristics of topography changes qualitatively.

• 대한치주과학회:학술대회논문집
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• 2005.11a
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• pp.167-167
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• 2005

• Proceedings of the Korean Institute of Industrial Safety Conference
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• 2005.04a
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• pp.48-53
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• 2005

• 전기의세계
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• v.15 no.3
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• pp.25-26
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• 1966

본 고에서는 배전선로에서 고저압 혼촉시 수용가의 배전선의 대지전위상승을 압제하기 위한 2종 접지전극으로서 도시에 광범위하게 망상으로 지중에 매설되어 접지저항도 대단히 낮은 값을 갖고 있는 수도관을 지금 접지전극으로 사용하고 있는 동판 대신에 이용할 경우의 제반현상을 대상으로 하였다. 즉 수도관을 2종접지전극으로 이용할 시의 수도관에 미치는 부식문제, 수도사용자에 대한 위험성검토, 수도관의 접지저항과 접지효과등을 검토하였다.

• Proceedings of the Korean Society of Rheology Conference
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• 2002.05a
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• pp.101-104
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• 2002

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2011.06a
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• pp.1417-1418
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• 2011

• Journal of Yeungnam Medical Science
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• v.4 no.2
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• pp.165-172
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• 1987

The term histiocytic medullary reticulosis first was introduced by Scott and Robb-Smith. It is a clinicopathologic symdrome characterized by wasting, fever, lymphadenopathy, hepatosplenomegaly, pancytopenia, and is often accompanied by jaundice, purpura. Cardinal pathologic features are systemized proliferation of atypical, neoplastic, erytherophagocytic histiocyte. We are here reporting one case which considered compatible for HMR, with a few elementary reviewed literatures.