Geomicrobiological studies of hot spring deposits for ancient earth environment reconstruction.

研究了富碳酸盐温泉、富硫温泉和含锰冷泉的水-矿物-细菌相互作用。首先，明确了碳酸盐沉积物（钙华）中流速、结构和细菌分布之间的关系。用微电极观察了富铁沉积物表面蓝藻的代谢活性。在富硫温泉中，硫氧化菌的代谢改变了水的化学性质。利用铁氧化菌沉淀冷泉中的氧化锰。

This study focuses on water-mineral-bacteria interaction on carbonate-rich hot spring, sulfur-rich hot spring and Mn-containing cold spring. First, relationship among flow rate, texture and bacterial distribution was cleared in carbonate sediment (travertine).Cyanobacterial metabolic activates on iron-rich deposit surface were observed with microelectrode profiles. In sulfur-rich hot spring, metabolism of sulfur oxidizing bacteria changed water chemical properties. Mn oxides in cold spring were precipitated by iron oxidizing bacteria.