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이원제 慶北大學校 齒科大學 1994 慶北齒大論文集 Vol.11 No.1
생리적 치근 흡수가 뒤따르는 유치 치주인대의 신경분포 및 변화를 평가하기 위하여 생후 1,2,3,4,5 개월된 개의 유치 치주인대와 9개월된 영구치 치주인대를 대상으로 neurofilament protein(NFP)을 이용한 면역조직화학적 방법으로 관찰하여 다음과 같은 결과를 얻었다. · 유견 유치의 치주인대 신경분포는 치근단 1/3 부위에서 가장 밀집되어 있었으며 치근 중앙부로 향할수록 현저하게 감소되었으며 전체적으로 그 분포밀 도 및 분지 정도는 영구치와 비교시 약한 양상을 나타냈다. · 유치근이 흡수됨에 따라 신경분포 정도도 감소되었으며 탈락시기의 치근 주위에서는 신경섬유를 관찰 할 수 없었다. · 치은점막상피의 신경지배는 치아가 발육함에 따라 감소되는 양상을 나타내었으며 설측점막이 순측점막보다 더 발달된 신경분포 양상을 관찰 할 수 있었다. · 유치 치주인대 신경말단 형태는 수지상의 신경말단 형태를 나타내고 있었으며 전형적인 Rufini 신경말단은 거의 관찰할 수 없었다. 이상의 결과를 미루어 신경섬유의 분포는 기능과 밀접한 관계가 있는 것으로 생각되고 더우기 유치의 생리적 치근흡수에 따른 치주인대의 신경섬유의 분포 및 변화는 유치의 성장뱔육에 따른 하나의 변화라고 생각된다.
이원제 국립생물자원관 2022 Journal of species research Vol.11 No.2
Three heterotrophic euglenids from marine water column (Seodo port, Yeosu) and freshwater sediment (Seodong-chun, Incheon), Korea were identified as Entosiphon oblongum Cavalier-Smith and Vickerman, 2016; Euglena longa (Pringsheim, 1936) Marin and Melkonian, 2003; and Keelungia pulex Chan and Moestrup, 2013 based on morphological characters and 18S rDNA sequence analysis. These species are reported taxonomically for the first time from Korea and are described with micrographs. Diagnoses of these species are as follows. Entosiphon oblongum: phagotrophic, gliding, size in vivo, 23.1-29.3 μm (Avg. 26.5 μm, n=30) long, ovate with a protrusive feeding siphon (apparatus), several deep grooves and two heterodynamic flagella. Euglena longa: osmotrophic, swimming, size in vivo, 32.3-52.2 μm (Avg. 42.2 μm, n=26) long, elongated with many paramylum granules and two flagellar. Keelungia pulex: phagotrophic, gliding, size in vivo, 13.5-19.7 μm (Avg. 16.4 μm, n=97) long, oblong to ovoid with a hook-shaped ingestion apparatus, several dorsal ridges and two flagella.
이원제,신경순,이재도 한국해양과학기술원 2007 Ocean and Polar Research Vol.29 No.4
In Korea the study of marine heterotrophic protists started in the late 1980s, and since the early 1990s many studies have been conducted in various marine environments. In this article, studies on the distribution and abundance of protists and the biotic interactions (bacteria-protists, phytoplankton-protists) conducted in Korean coastal waters are reviewed, and a field study is reported and discussed. The field study in Masan Bay was carried out from February 2004 to November 2005 at seven selected stations representative of the bay. During the study, the mean abundance of heterotrophic bacteria and the mean concentration of chlorophyll-a were 2.1x106 cells mL-1 and 9.8 mg L-1, respectively. Heterotrophic protists consisted of heterotrophic dinoflagellates, heterotrophic nanoflagellates (excluding dinoflagellates) and ciliates, and their abundances were means of 7.9x104 cells L-1, 1.2x103 cells mL-1, and 4.0x104 cells L-1, respectively. Generally, the chlorophyll-a concentrations and the abundances of heterotrophic bacteria and protists were higher in the inner zone of the bay, where there are high concentrations of organic matters, than in the middle and outer zones. Using the grazing rates of heterotrophic nanoflagellates on bacteria previously reported in this area, it can be calculated that about 69% of bacterial producton was removed by HNF grazing activity. About 24% of initial chlorophyll-a concentration was removed by microzooplankton grazing activity. In conclusion, this study suggests that in Masan Bay heterotrophic protists control the growth of bacteria and phytoplankton, and heterotrophic protists represent an important link of bacterial & microalgal biomass to higher trophic levels.
New Korean records of two amoeboid protozoa (Protist); Vannella bursella and Pseudoparamoeba sp.
이원제 국립생물자원관 2016 Journal of species research Vol.5 No.3
Two marine amoebae Vannella bursella (Page, 1974) Smirnov et al., 2007 and Pseudoparamoeba sp. were encountered from marine coastal waters of Masan Bay and Garorim Bay (Korea), respectively. These species are described with uninterpreted records based on light-microscopy of living cells and reported taxonomically for the first time from Korea. Diagnostics of these species are as follows. Vannella bursella: size in vivo, 17-29 μm long with flattened ovoid, semicircular locomotive forms. Pseudoparamoeba sp.: size in vivo, 10-15 μm long with elongated locomotive forms, producing a few short conical pseudopodia from anterior hyaline zone.