Expression of serotonin derivative synthetic genes on a single self-processing polypeptide and the production of serotonin derivatives in microbes |
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Authors: | Munyoung Park Kiyoon Kang Sangkyu Park Young Soon Kim Sun-Hwa Ha Shin Woo Lee Mi-Jeong Ahn Jung-Myung Bae Kyoungwhan Back |
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Institution: | (1) Faculty of Agriculture, Yamagata University, Tsuruoka Yamagata, 997-8555, Japan;(2) Laboratory of Applied Microbiology, Marine Biotechnology Institute, 3-75-1 Heita, Kamaishi Iwate, 026-0001, Japan;(3) Hashimoto Light Energy Conversion Project, ERATO, JST, Hongo, Bunkyo-ku, Tokyo 113-8656, Japan |
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Abstract: | Soils are rich in organics, particularly those that support growth of plants. These organics are possible sources of sustainable
energy, and a microbial fuel cell (MFC) system can potentially be used for this purpose. Here, we report the application of
an MFC system to electricity generation in a rice paddy field. In our system, graphite felt electrodes were used; an anode
was set in the rice rhizosphere, and a cathode was in the flooded water above the rhizosphere. It was observed that electricity
generation (as high as 6 mW/m2, normalized to the anode projection area) was sunlight dependent and exhibited circadian oscillation. Artificial shading
of rice plants in the daytime inhibited the electricity generation. In the rhizosphere, rice roots penetrated the anode graphite
felt where specific bacterial populations occurred. Supplementation to the anode region with acetate (one of the major root-exhausted
organic compounds) enhanced the electricity generation in the dark. These results suggest that the paddy-field electricity-generation
system was an ecological solar cell in which the plant photosynthesis was coupled to the microbial conversion of organics
to electricity. |
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Keywords: | Microbial fuel cell Paddy field Rhizosphere Root exudation |
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