Effects of Protozoa and Glass Beads on Bacterial Biomass and Metabolism in a Food Chain System of Glucose-Pseudomonas sp. strain DP-4-Tetrahymena thermophila
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概要
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The effect of the protozoa Tetrahymena thermophila or glass beads on the biomass of the bacterium Pseudomonas sp. strain DP-4 and metabolism of glucose in a steady state was studied in a food chain system of glucose-Pseudomonas sp. strain DP-4-T thermophila. Glucose was added to 1.5 ml cultures in 50 ml vials at a rate of 50 μg C/vial/day. In the 1.5 ml cultures without glass beads, the bacterial biomass was ca. 450 and 26 μg C/vial when the protozoa was absent and present, respectively. The bacterial biomass with glass beads was ca. 650 and 34 μg C/vial when the protozoa was absent and present, respectively. Protozoan biomass was 7 and 20 μg C/vial without or with glass beads, respectively. Irrespective of presence of the protozoa or glass beads, the rate of consumption of glucose per vial (50 μg C/vial/day) was considered to be almost the same as the rate of CO_2 evolution per vial (45-47 μg C/vial/day). The diameter of the glass beads (50, 70 or 100 μm) had no effect on the bacterial biomass in the absence of the protozoa. While, in the presence of the protozoa, the bacterial biomass was greatest when the diameter of glass beads was just 50 μm. These results suggested that the rate of glucose consumption per unit bacterial biomass of 0.11 μg glucose-C/μg biomass-C/day was increased to 1.9 μg glucose-C/μg biomass-C/day by protozoan predation, while the value was decreased to 0.077 μg glucose-C/μg biomass-C/day by glass beads. The significance of protozoan predation and particles for bacterial biomass and metabolic activity was discussed.
- 日本微生物生態学会の論文
著者
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YAMASHITA Yoshiro
Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology
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SATO Akira
Laboratory of Animal Genetics, Department of Applied Molecular Biosciences, Graduate School of Bioag
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Yamashita Yoshiro
Interdisciplinary Graduate School Of Science And Engineering Tokyo Institute Of Technology
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Yamashita Yoshiro
Laboratory Of Environmental Microbiology Department Of Environmental And Natural Resource Science To
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TARAO MITSUNORI
Laboratory of Environmental Microbiology, Department of Environmental and Natural Resource Science,
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SETO MASAYUKI
Laboratory of Environmental Microbiology, Department of Environmental and Natural Resource Science,
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Seto M
Laboratory Of Environmental Microbiology Department Of Environmental And Natural Resource Science To
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Seto Masayuki
Laboratory Of Environmental Microbiology Division Of Ecosciences Institute Of Symbiotic Science And
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Tarao M
Laboratory Of Environmental Microbiology Department Of Environmental And Natural Resource Science To
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Tarao Mitsunori
Laboratory Of Environmental Microbiology Division Of Ecosciences Institute Of Symbiotic Science And
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Yamashita Y
Department Of Electronic Chemistry Interdisciplinary Graduate School Of Science And Engineering Toky
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Yamashita Y
Department Of Electronic Chemistry Interdisciplinary Graduate School Of Science And Engineering Toky
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Sato Akira
Laboratoire De Chimie Du Solide Du Cnrs Universite Bordeaux I
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Sato Akira
Laboratory Of Environmental Microbiology Department Of Environmental And Natural Resource Science Tokyo University Of Agriculture And Technology
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