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김정배,이원찬,김대중,성기백,최희구,최우정,황학빈,홍석진,김형철,박성은,심정희,강창근,Kim, Jeong Bae,Lee, Won-Chan,Kim, Dae-Jung,Seong, Ki Baik,Choi, Hee-Gu,Choi, Woo-Jeung,Hwang, Hak Bin,Hong, Sokjin,Kim, Hyung Chul,Park, Sung-Eun,Shim, 한국해양학회 2013 바다 Vol.18 No.4
실뱀장어는 산란장인 마리아나해구에서 산란 및 부화과정을 거쳐, 뱀장어 자어인 렙토세팔루스 단계에서 북적도 해류와 쿠로시오 해류를 따라 회유하면서 변태과정을 거치게 된다. 변태된 실뱀장어는 동중국해를 지나 우리나라 연안으로 올라오는데 실뱀장어의 먹이원에 대해서는 알려진 바가 없었다. 실뱀장어 먹이원은 안정동위원소 비값을 측정하여 수서 생태계에 존재하는 먹이망에 의한 단계별 증가율을 해석함으로써 가능하다. 2012년 4월에 채집된 자연산 실뱀장어의 탄소 및 질소 안정동위원소를 측정하여 먹이원을 밝히기 위하여 실뱀장어 ${\delta}^{13}C$과 ${\delta}^{15}N$를 분석하고 서해안 및 동중국해 북부해역의 가용 가능한 입자유기물질에 대한 값들을 분석, 비교하였다. 우리나라 서해안에서 채집된 실뱀장어의 ${\delta}^{13}C$값은 $-20.7{\pm}0.1$‰, ${\delta}^{15}N$값은 $5.0{\pm}0.2$‰로 나타났다. 실뱀장어의 가용 먹이원으로 추정되는 입자유기물질 중 서해안의 ${\delta}^{13}C$값은 $-24.0{\pm}0.3$‰이고, ${\delta}^{15}N$값은 $2.8{\pm}0.4$‰이었고, 동중국해 북부해역의 ${\delta}^{13}C$값은 $-24.5{\pm}0.5$‰이고, ${\delta}^{15}N$값은 $0.8{\pm}0.3$‰이었다. 일반적으로 알려진 영양단계에 따른 동위원소 분별 비값 증가율을 고려할 때, 본 연구에서 나타난 서해안과 동중국해의 POM과 서해안에서 채집된 실뱀장어의 ${\delta}^{13}C$과 ${\delta}^{15}N$값의 차이는 서해안과 동중국해의 입자유기물질이 자연산 실뱀장어의 먹이원으로써 이용되지 않았다는 것을 알 수 있었다. 따라서, 우리나라 연안에서 채집되는 실뱀장어는 뱀장어 자어인 렙토세팔루스에서 변태과정을 거친 이후에는 먹이를 섭이하지 않고 회유하는 것으로 나타났다. Glass eels (Anguilla japonica) are caught in the west coast of Korea on their migratory route from the breeding grounds in the Mariana Trench along the North Equatorial Current and the Kuroshio Current. To identify the food source of natural glass eels, we analyzed the stable C and N isotopes of glass eels caught in April 2012 and investigated possible food sources in the survey area. In particular, with respect to the stable C and N isotopes of particulate organic matter, we extended the surveying area to the northern parts of East China Sea as well as the west coast of Korea. The stable C and N isotope ratios of the glass eels caught in the west coast were found to be $-20.7{\pm}0.1$‰ and $5.0{\pm}0.2$‰, respectively. The stable C and N isotope ratios of the particulate organic matter in the west coast of Korea, in which the glass eels are assumed to eat the particulate organic matter as food source, were estimated to be $-24.0{\pm}0.3$‰ and $2.8{\pm}0.4$‰, respectively. Similar data were obtained from the northern part of the East China Sea, $-24.5{\pm}0.5$‰ and $0.8{\pm}0.3$‰. The stable isotope ratios showed values differing from the stepwise increasing rates up the food web in natural aquatic ecosystem, showing that particulate organic matter in the west coast of Korea and East China Sea was not served as the glass eels food source. This result suggested that the glass eels caught in the west coast might not assimilate nutrition from the marine environment during long migration.
법랑질에 국소도포된 불화물의 효과에 관한 X-선 광전자분광기 및 주사전자현미경적 연구
이상대,홍석진 전남대학교 치과대학 1991 전남치대논문집 Vol.3 No.1
This study was performed to examine the reaction of the different flouride agents(AlF_3, NaF, Na_2PO_3F, NH_4F, SnF_2, TiF_4) on enamel as well as to compare the anticarious effect of these agents. The adsorption of fluoride on powdered enamel under various kinds and concentrations of fluoride solution treatment was measured by specific electrode. Enamel specimens treated with 6 kinds of 1,000ppm fluoride solution were evaluated for enamel solubility. And enamel surfaces treated with these fluoride solutions were analyzed by X-ray photoelectron spectroscopy and scanning electron microscopy. The results were as follows : 1. The adsorption of fluoride on powdered enamel increased gradually by the concentration of the fluoride solutions. The adsorption of fluoride on powdered enamel treated with NH_4F and NaF solutions at pH 4.0 was relatively higher than that of other fluoride solutions. In NF_4F and NaF solution, the adsorption of fluoride on powdered enamel was higher at pH 4.0 solution than at pH 7.0 solution. 2. In enamel solubility, that of enamel specimen treated with NH_4F solution was the lowest of all specimens and followed by the specimens treated with TiF_4, SnF_2, VaF, Na_2PO_3F, and AlF_3 solution in order. And enamel specimens treated with any fluoride solutions were less soluble than control group untreated with fluoride solution. 3. The fluorine on enamel surface treated with NH_4F solution comprised 2.91% of the detected elements and in the case of Na_2PO_3F it did 0.79%. In AlF_3, SnF_2, and TiF_4 solutions, Al, Sn, and Ti atoms comprised 8.23%, 13.61% and 6.10%, respectively. 4. In SEM photomicrographs, NH_4F solution made the granular surface deposits on enamel surface, and irregular crystallines were slightly deposited in AlF_3, SnF_2 solutions. TiF_4 solution produced a tenacious surface coating on enamel surface with irregular cristallines. 5. NaF and NH_4F solutions formed calcium fluoride. SnF_2, TiF_4 solutions deposited the metallic salts on enamel surface. These fluoride solutions caused the increase of fluoride contents on enamel and the reduction of enamel solubility.
Triclosan 함유치약이 치태 , 치은염 및 치석형성에 미치는 영향에 관한 연구
이상대,정성숙,홍석진,최유진 대한구강보건학회 1998 大韓口腔保健學會誌 Vol.22 No.1
A double blind, three month clinical study was conducted to determine the effect of triclosan containing test dentifrice on supragingival plaque, gingivitis and supragingival calculus formation compared to a 0.76 precent monofluorophosphate-calcium carbonate dentifrice. Test dentifrice had the same formulation as the control except it contained 0.3 percent triclosan and 0.1 percent aluminium chlorohydroxy allantoinate, Seventy-three adults aged from 31 to 39 years, were included in this study. Subjects were randomly assigned to test group or to control group according to baseline plaque (Silness-Lo¨e), gingivitis (Silness-Lo¨e), and calculus (modified Volpe-Manhold) scores, Subjects brushed three times daily in their customary manner, and refrained from using any other hygiene products and any dental treatment, Subjects were evaluated for plaque, calculus formation, and for gingivitis after 3 months' use of the dentifrices, Test group exhibited significantly the lower plaque levels and the higher levels of gingival health by the use of the dentifrice contained triclosan and ALCA throughout 3 months, whereas this improvement was not showed by control group, However, Levels of calculus was not improved by the use of the dentifrice contained triclosan and ALCA, The improved plaque control, stabilized gingival health support the conclusion that a dentifrice contained 0.3 percent triclosan and 0.1 percent ALCA can contribute to oral health.