Measurement of soil bacterial colony temperatures and isolation of a high heat-producing bacterium
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- 作者：Kenji Tabata (1)
Fuminori Hida (2)
Tomoyuki Kiriyama (2)
Noriaki Ishizaki (2)
Toshiaki Kamachi (2)
Ichiro Okura (2) - 关键词：Heat production ; Thermogenesis ; Thermograph ; Growth ; independent reaction ; Energy ; spilling reaction
- 刊名：BMC Microbiology
- 出版年：2013
- 出版时间：December 2013
- 年：2013
- 卷：13
- 期：1
- 全文大小：207KB
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Fuminori Hida (2)
Tomoyuki Kiriyama (2)
Noriaki Ishizaki (2)
Toshiaki Kamachi (2)
Ichiro Okura (2)
1. Frontier Research Center, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama, 226-8501, Japan
2. Department of Bioengineering, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama, 226-8501, Japan - ISSN：1471-2180
文摘
Background The cellular temperatures of microorganisms are considered to be the same as those of their surroundings because the cellular volume is too small to maintain a cellular temperature that is different from the ambient temperature. However, by forming a colony or a biofilm, microorganisms may be able to maintain a cellular temperature that is different from the ambient temperature. In this study, we measured the temperatures of bacterial colonies isolated from soils using an infrared imager and investigated the thermogenesis by a bacterium that increases its colony temperature. Results The temperatures of some colonies were higher or lower than that of the surrounding medium. A bacterial isolate with the highest colony temperature was identified as Pseudomonas putida. This bacterial isolate had an increased colony temperature when it grew at a temperature suboptimal for its growth. Measurements of heat production using a microcalorimeter showed that the temperature of this extraordinary, microcalorimetrically determined thermogenesis corresponded with the thermographically observed increase in bacterial colony temperature. When investigating the effects of the energy source on this thermal behavior, we found that heat production by this bacterium increased without additional biomass production at a temperature suboptimal for its growth. Conclusions We found that heat production by bacteria affected the bacterial colony temperature and that a bacterium identified as Pseudomonas putida could maintain a cellular temperature different from the ambient temperature, particularly at a sub-optimal growth temperature. The bacterial isolate P. putida KT1401 increased its colony temperature by an energy-spilling reaction when the incubation temperature limited its growth.