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[文献書誌] 清水桂, 長谷川聖, 花木啓祐: "硫黄脱窒を用いたオンサイトでの硝酸態窒素除去プロセスにおける微生物相の把握"日本水環境学会年会講演集. 36. 422 (2002)
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[文献書誌] K.Hasegawa, R.Kai, K.Hanaki: "Suppression of Nitrous Oxide from Agricultural Soil-water System by On-site Sulfur Denitrification"Non-CO_2 Greenhouse Gases : Scientific Understanding, Control Options and Policy Aspects", J.VanHam, A.P.M.Baede, R.Guicherit and J.G.F.M.Wiilliam-Jacobse (eds.), Millpress, The Netherlands. 493 (2002)
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[文献書誌] 清水桂, 長谷川聖, 花木啓祐, 根岸勉: "硫黄脱窒細菌の微生物群集構造解析と処理特性の評価"土木学会第57回年次学術講演会講演集. 87-88 (2002)
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[文献書誌] K.Shimizu, K.Hasegawa, K.Hanaki: "Application of sulfur denitrification process to actual field and microbial community analysis"Proc. of Sino-Singapore Joint Symposium on Environmental Protection Technologies and Environmental Hydraulics 2003 & First Asian Environmental Research Alliance Partnership Symposium. 231-236 (2003)
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[文献書誌] 清水桂, 長谷川聖, 花木啓祐: "実現場における硫黄脱窒による硝酸態窒素除去試験での処理特性及び微生物群集評価"日本水環境学会年会講演集. 37. 505 (2003)