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熟成ろ材の長期保存のためのアンモニア酸化微生物活性に及ぼす温度の影響 60555267 Imai, Tadashi 今井, 正 イマイ, タダシ Imai 今井 イマイ Tadashi 正 タダシ Dehama, Kazuya 出濱, 和弥 デハマ, カズヤ Dehama 出濱 デハマ Kazuya 和弥 カズヤ 日本水工設計株式会社 70372034 Sakami, Tomoko 坂見, 知子 サカミ, トモコ Sakami 坂見 サカミ Tomoko 知子 トモコ 60399110 Takashi, Toshinori 髙志, 利宣 タカシ, トシノリ Takashi 髙志 タカシ Toshinori 利宣 トシノリ 30553408 Morita, Tetsuo 森田, 哲男 モリタ, テツオ Morita 森田 モリタ Tetsuo 哲男 テツオ 20644842 Imai, Satoshi 今井, 智 イマイ, サトシ Imai 今井 イマイ Satoshi 智 サトシ 30426308 Oka, Masakazu 岡, 雅一 オカ, マサカズ Oka 岡 オカ Masakazu 雅一 マサカズ 60443363 Yamamoto, Yoshihisa 山本, 義久 ヤマモト, ヨシヒサ Yamamoto 山本 ヤマモト Yoshihisa 義久 ヨシヒサ Filter material; Preservation; Temperature; Biological filter The propose of this study was to assess the suitable conditions to preserve filter materials which were attached nitrifying microorganisms for a long period. We investigated the effect of the preservation temperature on the ammonia oxidation activity of filter materials kept in saturated humidity in plastic bags. After the ammonia oxidation activity of filter materials was measured at 25°C, filter materials were removed from seawater and kept at eight temperatures (1-35°C) in plastic bags for 180 days. Ammonia oxidation activity of the filter aterial preserved at 1°C was similar to that of the initial activity value. In addition, the relative abundance of ammonia-oxidizing archaea and bacteria in the filter materials preserved at 1°C exhibited only a slight decrease of 14% and 10% of the initial abundances, respectively. Activity of filter materials preserved at 5-20°C decreased to about 50%. Greater decrease of activity was recognized in filter materials preserved at over 25°C. An additional preservation experiment over a three year period at 1°C showed that the activity of filter aterials remained at 33%. Therefore, highest retention of the ammonia oxidizing microorganism for long preservation of filter materials with nitrification was 1°C in the designed temperature. 添付ファイルは、j-stageからダウンロード 日本水産増殖学会 Japanese Society for Aquaculture Science 2021-04-20 jpn journal article VoR https://fra.repo.nii.ac.jp/records/242 10.11233/aquaculturesci.69.93 20230410026 fish-u:71-026 https://www.jstage.jst.go.jp/article/aquaculturesci/69/1/69_93/_article/-char/ja/ J-STAGE https://jglobal.jst.go.jp/detail?JGLOBAL_ID=202102268477130539 J-GLOBAL 0371-4217 水産増殖 Aquaculture Science 69 1 8 93 100 https://fra.repo.nii.ac.jp/record/242/files/20230410026.pdf application/pdf 1.0 MB 2022-04-20