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RISS 인기검색어
- 검색키워드
- 저자 : Tanahara, Ai (검색결과 3 건)
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Tanahara, Ai,Maki, Masayuki The Korean Society of Weed Science and The Turfgra 2010 Weed Biology and Management Vol.10 No.2
In this study, we examined the genetic diversity in three populations of the critically endangered annual, Bidens cernua, in Japan by using inter-simple sequence repeat markers and compared our data with those from two common congeners: Bidens radiata var. pinnatifida and Bidens tripartita. In contrast to our expectations, the degree of genetic diversity at the species level was higher in B. cernua than in B. radiata var. pinnatifida or B. tripartita. At the population level, the degree of genetic diversity was highest in B. cernua.These results may be ascribed to the mating system and method of seedbank formation in B. cernua. An analysis of molecular variance revealed relatively high genetic differentiation among the populations of all three species. We concluded that the distribution width could not be an index of genetic variability in Bidens examined in this study.
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Akihide Itoh,Yoshito Oshiro,Sotaro Azechi,Yuka Somada,Daishi Handa,Yoichi Miyagi,Kazuhiko Nakano,Akira Tanahara,Takemitsu Arakaki 한국대기환경학회 2018 Asian Journal of Atmospheric Environment (AJAE) Vol.12 No.4
In the present study, total suspended particle (TSP) aerosols were simultaneously collected using identical high-volume air samplers at three islands in Okinawa; Cape Hedo Atmosphere and Aerosol Monitoring Station (CHAAMS, Okinawa Island), from 2008 to 2012 Kume Island (KM, ca. 160 km south-west of CHAAMS), and Minami-Daitou Island (MD, ca. 320 km south-east of CHAAMS) from 2008 to 2010. The sample collected were analyzed using energy-dispersive X-ray fluorescence spectrometry (ED-XRF) and synchrotron radiation X-ray fluorescence spectrometry (SR-XRF) to investigation longrange transport of metal elements to Okinawa from the Asian continent. From analytical data on samples collected at CHAAMS for five years, it was found that most elements (Ca, Fe, Ti, Mn, V, Cu, Ni, Pb, As, and Zn) in TSP aerosols showed higher concentrations in the period from October to May, when the continental air mass passed over Okinawa, regardless of Asian dust events. The annual average concentrations of Ni, Cu, Zn, As, Se, and Pb in TSP aerosol samples collected at three islands gradually decreased as the TSP aerosols traveled from west to east in any year. Based on the enrichment factors (EFs) and concentration ratios, it is considered that most of anthropogenic elements such as As, Pb, and Zn in TSP aerosols are derived from coal combustion in the Asian continent. Moreover, it is confirmed from the direction of the air mass reaching the sampling sites that Cu, Zn, As, and Pb in TSP aerosols were transported to the three islands in Okinawa by air mass not only from northwest and north, but also from the west. These TSP aerosols transported from the Asian continent may influences not only the atmospheric environment but also the concentrations of trace metals in coastal seawater in Okinawa, which have to be kept extremely low to preserve the diverse and unique ecosystem in coral reefs.
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韓國과 日本의 家庭敎育 形態에 대한 比較文化的 硏究 : 한국의 濟州道와 일본의 沖繩縣을 대상으로 on Jejudo in Korea and Okinawa in Japan
白雲鶴,棚原健次,中村完,井村修,林鍾益 한국교육학회 대구·경북지회 1991 교육학논총 Vol.10 No.-
The present study was aimed to investigate the patterns of home education between Jejudo in Korea and Okinawa in Japan on the perspectives of cross-cultural viewpoint The subjects of the present study were 4718 fathers in Korea and Japan (Jejudo 2562, Okinawa 2156) who have school boys and girls. The results of the present stady were as follows: (1) Fathers in Korea were closer to 'inconsistency-discord pattern' in the rearing attitude than those of Japan. (2) Fathers in Korea had the consciousness and attitude of 'home centered-chidren centered' in the lives at home and soial activities. On the other hand, fathers in Japan had the tendency of pursuing the practical things such as stability of life and higher status. (3) Fathers in Korea had more concern to their children's school achievement than those of Japan. (4) Fathers in Korea had the positive attitude for men to take complete charge of house keeping and child-rearing than fathers in Japan. But, the level of practical performance of fathers in Korea was lower than that of fathers in Japan. (5) Fathers in Korea had stress on the strengthening of function of home education to bring up their children samely. But, fathers in Japan had stress on the social efforts to remove social environment harmful to adolescent.
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