Approaching the transform of metals by bacteria in rain water

2016 Fiscal Year Final Research Report

• Project/Area Number: 15K12192
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Environmental dynamic analysis
• Research Institution: Prefectural University of Kumamoto
• Principal Investigator: Zhang Daizhou 熊本県立大学, 環境共生学部, 教授 (90322726)
• Project Period (FY): 2015-04-01 – 2017-03-31
• Keywords: 物質循環 / 微生物 / 雲水イオン化学

Outline of Final Research Achievements

Methods of quantification and identification of bacteria in rainwater were developed and applied to measure the cell concentration, viability, and communities of bacteria in the rainwater collected in every rain episode in a year at Kumamoto. Results showed the distinctive natures of cell concentration, viability and bacterial communities according to the synoptic weather causing rain, i.e., cyclones, Meiyu fronts and typhoons. In the rainwater of cyclones when clouds were induced by the intrusion of continental air, the fraction of bacterial indicator taxa of soil bacteria was larger, the cell concentration was higher, and the viability was lower than in the rainwater of other rain types. Growth of bacteria in the collected rainwater was not identified. Under incubation conditions, predominant strains of multiplying were encountered, while the concentration of ions including sulfate, nitrate, chloride, ammonium, calcium and iron did not change considerably.

Free Research Field

大気環境学