著者

牧 輝弥 小林 史尚 柿川 真紀子 鈴木 振二 當房 豊 山田 丸 松木 篤 洪 天祥 長谷川 浩 岩坂 泰信

出版者

日本エアロゾル学会

雑誌

エアロゾル研究 (ISSN:09122834)

巻号頁・発行日

vol.25, no.1, pp.35-42, 2010-03-20 (Released:2010-03-25)

参考文献数

23

被引用文献数

2

---

The microbial communities transported by Asian desert dust (KOSA) events have attracted much attention as bioaerosols, because the transported microorganisms are thought to influence the downwind ecosystems in Japan. In particular, halotolerant bacteria which are known to be tolerant to atmospheric environmental stresses were investigated for clarifying the long-range transport of microorganisms by KOSA. Bioaerosol samples were collected at high altitudes within the KOSA source area (Dunhuang City, China) and the KOSA arrival area (Suzu City, Japan). The microorganisms in bioaerosol samples grew in media containing up to 15 % NaCl, suggesting that bacteria tolerant to high salinities would remain viable in the atmosphere. The PCR-DGGE (Denaturing gradient gel electrophoresis) analysis using 16S rRNA genes sequences revealed that the halobacterial communities in bioaerosol samples belonged to the members of the genera Bacillus and Staphylococcus and that some bacterial species belonging to Bacillus subtilis group were similar among the samples of both cities. Moreover, some sequences of B. subtilis group were found to be identical for the species collected at high altitudes and on the ground surfaces. This suggests that active mixing of the boundary layer transports viable halotolerant bacteria up to the free atmosphere at the KOSA source area, while down to the ground surface at the KOSA arrival areas.

著者

岩坂 泰信 張 代洲 小林 史尚 牧 輝弥 柿川 真紀子 洪 天祥

出版者

金沢大学

雑誌

基盤研究(A)

巻号頁・発行日

2008

---

タクラマカン砂漠での気球観測では上空に浮遊する黄砂の約10%が微生物と合体していた。黄砂が偏西風帯にまで舞い上がった時点ですでに微生物を付着させている可能性が高い。能登半島での観測は、黄砂濃度上昇時に微生物濃度が上昇し「黄砂とともに大気圏を移動している」ことを強く示唆した。立山山頂付近の積雪の黄砂層の微生物多様性はタクラマカン砂漠のものと高い類似性があり、砂塵発生源地からの長距離移動・拡散を示唆した。