1994 Fiscal Year Final Research Report Summary
Fixation of Carbon Dioxide and Evolution of Clean Biogases by Freshwater Microalgae
| Project/Area Number |
05808050
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
環境保全
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| Research Institution | CHIBA UNIVERSITY |
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Principal Investigator |
INUBUSHI Kazuyuki Chiba University, Faculty of Horticulture, Associate Professor, 園芸学部, 助教授 (00168428)
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| Co-Investigator(Kenkyū-buntansha) |
SAKAMOTO Kazunori Chiba University, Faculty of Horticulture, Research Associate, 園芸学部, 助手 (10225807)
OBATA Hitoshi Mie University, Faculty of Bioresources, Associate Professor, 生物資源学部, 助教授 (70024594)
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| Project Period (FY) |
1993 – 1994
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| Keywords | Global warming / Carbon dioxide / Temperate limnology / Tropical limnology / Freshwater algae / Evolution of hydrogen / High-perfomance algae / Screening |
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| Research Abstract |
Concentration of carbon dioxide in the atmosphere has beenincreased rapidly during past decades Carbon fixation by microalgaeis now intensively studied, but utilization of fixed carbon may be another problem. Production of hydrogen and other clean biogases by microalgae such as blue-green algae (cyanobacteria) were studied by using temperate and tropical strains isolated from freshwater ecosystems, including paddy fields and ponds. Strains with high abilities of fixing carbon dioxide and producing hydrogen were screened. Effect of light intensity, temperature and concentration of carbon dioxide were investigated by examining their growth curves. Chlorophyll contents were determined to evaluate efficiencies of growth and biogases production. Hydrogen production ability depressed under high carbon dioxide concentration conditions. While hydrogen production per unit weight of chlorophyll in cyanobacteria were almost constant regardless of light intensities. Further needs for research became clear from these results of this study.
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