Biomineralization in Biomats at Hirayu Hot Springs.
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Accession number;00A1002974
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| Title;Biomineralization in Biomats at Hirayu Hot Springs. |
| Author;
ONO MOTOHIRO
(Kanazawadai Daigakuin Shizenkagakukenkyuka)
TAZAKI KAZUE
(Fac. of Sci., Kanazawa Univ.)
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Journal Title;Earth Science
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Journal Code:F0193A
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ISSN:0366-6611
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VOL.54;NO.5;PAGE.298-309(2000)
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| Figure&Table&Reference;FIG.9, TBL.1, REF.52 |
| Pub. Country;Japan |
| Language;Japanese |
| Abstract;Colorful biomats were found at Obakoharanoyu in Hirayu Hot Springs, Gifu, Japan. At the upper stream white biomats were commonly found, whereas brown and green biomats occur at the down stream, according to change of environmental conditions, such as temperature, pH, Eh, DO, S2-, photosynthesis and water flow velocities. The pH, WT, Eh, and DO diagrams of the hot spring water from upper to down stream have responded to the occurrence of biomats. White biomats occur in low pH (6.1), reducing (Eh:-270mV), micro-aerobic (DO: 0.3mg/l) and high temperature (70.DEG.C.) conditions. On the other hand, brown biomats occur in wide ranges of pH (6.5-7.8), Eh (-125-90mV), DO (2.0-5.0mg/l) and WT (42-60.DEG.C.) respectively. In contrast, the occurrence of green biomats are high pH (8.4), oxidizing (Eh: 100mV), aerobic (DO: 7.5mg/l) and middle temperature (30.DEG.C.). Sulfur ions are detected in water on the white biomats (1-2ppm), while not detected from both brown and green biomats. The white biomats comprising sausage shaped bacteria contain abundant sulfur. The green biomats consist of filamentous bacteria with abundant calcite. The results have revealed that the color of biomats reflects the environmental conditions. TEM and SEM observations indicate that sulfur particles adhere to capsule on the cell wall of sausage shaped bacteria in white biomats. The sulfur particles might be grown to a-sulfur crystals of 10.MU.m in size. The results have revealed that sulfur-biomineralization of sausage shaped bacteria in white biomats is a very important factor for sulfur removal in hot springs. (author abst.) |
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