@article{oai:repo.qst.go.jp:00043167,
 author = {Sakashita, Tetsuya and Doi, Masahiro and Yasuda, Hiroshi and Takeda, Hiroshi and Fuma, Shoichi and Nakamura, Yuuji and P., Haeder Donat and 坂下 哲哉 and 土居 雅広 and 保田 浩志 and 武田 洋 and 府馬 正一 and 中村 裕二},
 journal = {Biomedical and Environmental Sciences},
 month = {},
 note = {Objective  To study the effects of gamma-ray irradiation on carbon fixation (Specific production rate: SPR), CO2 utilization efficiency (CUE) and electron transfer rate (ETR) in the photosynthetic flagellate Euglena gracilis strain Z in a dose-response dependent manner. 
Methods  Euglena cells were cultured in an inorganic nutrient medium containing ammoniium chloride or proteose peptone. Cells were exposed to gamma-ray at 5 doses (0, 100, 250, 350, 500 Gy for water). Five days after irradiation, three photosynthetic activities were measured. SPR, which is a carbon uptake rate per unit carbon mass, was determined by C13 tracer methodology. CUE was evaluated using a relation of carbon isotope fractionation in Calvin cycle. ETR in photosystem II (PS II) was measured by a chlorophyll fluorescence analysis.
Results  Even at a dose of 500 Gy, 80% of in the non-irradiated control at 500 Gy. Furthermore, the dose response of ETR was considerably different from the others.
Conclution  Our findings suggest that not only PS II but also the Calvin cycle in the photosynthetic system is affected by gamma ray irradiation.},
 pages = {261--267},
 title = {Gamma irradiation effect Variation of photosynthetic activity of Euglena.},
 volume = {15},
 year = {2002}
}