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A Novel Chlorophyll d-containing Organism: Discovery and its Significance
Murakami, Akio,Kawai, Hiroshi,Adachi, Kyoko,Sakawa, Takahiro,Miyashita, Hideaki,Mimuro, Mamoru Korean Society of Photoscience 2002 Journal of Photosciences Vol.9 No.2
Chlorophyll (Chi) d was assigned to an antenna pigment of red algae in 1943, but its presence and function in red algae have not been necessarily clear for a long time. In 1996, it was shown that Chi d functioned as a major antenna pigment in a peculiar oxygenic photosynthetic prokaryote, Acaryochloris marina, isolated as a symbiont of a colonial ascidian from coral reefs. This finding evoked the necessity for reexamination of the presence and function of Chi d in red algae. We found Chi d in methanol-extract from several marine red algae, and the relative content was high in one species, Ahnfeltiopsis flabelliformis. Absorption and fluorescence spectra, HPLC analysis, and NMR and mass spectroscopy characterized Chi d extracted from the red algal thalli, and those were essentially identical to those of Chi d isolated from A. marina. However, micro-spectrophotometric analysis suggested that Chi d was not an actual constituent of the red algae but came from epiphyte(s) attached to surface of red algal thalli.
경기육괴 북동부 고성-간성 지역 선캠브리아 암석의 CHIME 연대와 그 지체구조적 의의
조등룡(Deung-Lyong Cho),Kazuhiro Suzuki,최위찬(Ueechan Chwae),Mamoru Adachi 한국암석학회 2007 암석학회지 Vol.16 No.1
경기육괴 북동부 고성-간성 지역에 분포하는 선캠브리아 암석의 CHIME 연대를 측정하였다. 정편마암류의 모나자이트 및 저어콘은 1672±69Ma 내지 1414±36Ma이고, 준편마암류의 모나자이트는 1703±70Ma 내지 1395±97Ma로서 약 1.7-1.4 Ga 사이의 화성활동과 수반한 변성작용을 나타낸다. 이를 전 지구적인 지체구조운동에 대비하변 경기육괴에서 광범위하게 보고되는 1.9-1.8 Ga의 열적사건은 콜롬비아 초대륙의 형성과 관련된 조산운동으로, 이 연구의 1.7-1.4 Ga 심성암의 관입과 변성작용은 콜롬비아 초대륙 형성 후의 대륙연변부의 성장과 관련된 결과로 해석할 수 있다. 그러나 이는 주로 연대측정 자료에 의존한 것으로서 추후 자세한 암석학 및 지화학적 연구를 통한 검정이 필요하다. CHIME (chemical Th-U-total Pb isochron) geochronology were made for Precambrian rocks from Goseong-Ganseong area, northeastern part of the Gyeonggi massif. Zircon and/or monazite grains from orthogneisses give 1672 ± 69 to 1414 ± 36 Ma ages, and monazite grains from paragneisses yield similar ages ranging from 1703 ± 70 to 1395 ± 97 Ma suggesting that 1.7-1.4 Ga igneous intrusions and coeval metamorphisms were occurred over the area. Together with reported prevailing 1.9-1.8 Ga igneous activities and regional metamorphism from the Gyeonggi massif, our age data from Goseong-Ganseong area would be potentially correlated with long-lived (1.8-1.3 Ga) global tectonothermal events in marginal outgrowth of supercontinent Columbia which was finally assembled by collisional orogenies at -1.8 Ga. Petrological and geochmical studies, however, should be followed to confirm this tectonic interpretation.