著者

江里口 知己 堀口 文男 亭島 博彦 中田 喜三郎 高倍 昭洋 田口 浩一

出版者

海洋理工学会

雑誌

海洋理工学会誌 (ISSN:13412752)

巻号頁・発行日

vol.19, no.2, pp.35-41, 2014 (Released:2014-06-26)

参考文献数

17

被引用文献数

1

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We have developed a bioaccumulation model to estimate the concentration of hazardous chemicals accumulated in marine organisms. In this study, we applied this bioaccumulation model to estimate the concentration of radioactive materials in coastal fish. Target substances were radiocesium (134Cs, 137Cs) and the target fish were Japanese whiting (Sillago japonica) in Tokyo Bay. The radiocesium concentrations in sediments and fish were examined by field sampling on July 3 and August 9, 2012 in Tokyo Bay. The time course of radiocesium concentrations in Japanese whiting after the Fukushima Daiichi nuclear disaster was simulated using the model. Our model showed that good results were obtained by using the assimilation efficiency parameter of 10–20%, and radiocesium concentrations in Japanese whiting were about same as the levels recorded in the field sampling (517 days after the disaster). In the Edogawa River and the Arakawa River estuary, where high radiocesium concentrations were observed in sediments, Japanese whiting showed accumulations of 134Cs and 137Cs estimated at 5.0 Bq/kg-wet and 6.5 Bq/kg-wet, respectively.

著者

吉田 司 芝 修一 前川 行幸 阿部 真比古 鈴木 輝明 高倍 昭洋

出版者

日本水産工学会

雑誌

水産工学 (ISSN:09167617)

巻号頁・発行日

vol.42, no.3, pp.239-244, 2006-02-20

被引用文献数

1

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Zostera marina L. form dense populations on shallow sandy and muddy bottoms in inner bay areas, and play important roles from ecological and fisheries points of view. In this study, photosynthesis characteristics of Z. marina were examined under several light intensity and the water temperature conditions, and the daily net production was estimated. Samples were collected from Miya in Mikawa Bay, Aichi Prefecture, Japan. Photosynthesis and dark respiration rates were measured under various light intensity and in situ temperature condition using a product meter and oxygen electrode system. Z. marina showed high light-saturated net photosynthetic rates(1.5〜7.6mgO_2 gd.w.^<-1> h^<-1>). Dark respiratory rate of Z. marina was between 0.4 and S.SmgO_2 gd.w.^<-1> h^<-1>, I_k values and compensation points ranged from 88 to 129μmol m^<-2> s^<-1> and from 13 to 111 μmol m^<-2> s^<-1>, respectively. Daily net production of Z. marina was estimated from the model equation of photosynthesis-light curve and the data on light intensity sampled in Zostera bed. High dark respiratory rate and low light intensity in the population lead to low net production, and result in withering and loss during the early summer season.

著者

小島 秀夫 鈴木 隆之 多和田 昌弘 高倍 昭洋 下山 宏

出版者

一般社団法人電子情報通信学会

雑誌

電子情報通信学会技術研究報告. OME, 有機エレクトロニクス

巻号頁・発行日

vol.97, no.473, pp.1-6, 1998-01-20

参考文献数

4

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近年光音響分光法 (PAS) は、試料を前処理無しで、非破壊的に測定できることから、生体の分野、特に光合成関連の研究に対して、非常に多く使用されてきている。本研究では、光音響分光装置を製作し、植物光合成の測定を試みた。同時に、密閉型光音響セルの問題点を改良したOpen Photoacoustic Cell (OPC) を製作し、測定を行った。その結果、OPCを使用した測定法は、密閉型セルよりも光合成の活性が高い状態で測定できることが分かった。