2007 Fiscal Year Final Research Report Summary
Study on contribution of shock pressure profiles to inactivation of marine bacteria
| Project/Area Number |
18560768
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Naval and maritime engineering
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| Research Institution | Kobe University |
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Principal Investigator |
ABE Akihisa Kobe University, Graduate School of Maritime Science, Professor (50221726)
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| Co-Investigator(Kenkyū-buntansha) |
MIMURA Haruo Kobe Unirversity, Graduate School of Maritime Sciences, Professor (90190727)
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| Project Period (FY) |
2006 – 2007
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| Keywords | Gas gun experiment / Underwater shock wave / Marine bacteria / Impactor / Target container / Shock pressure profile / Shock pressure control / Inactivation of marine bacteria |
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| Research Abstract |
In the present study, we proposed the marine bacteria inactivation technology using shock pressure, and investigated the relation between shock pressure action and the inactivation of marine bacteria with physical and biochemical approach in order to clarify the contribution of shock pressure profiles to the inactivation of marine bacteria.
We generated shock waves in a water container with a gas gun facility. In order to understand the behavior of shock waves in the container, the visualization experiment with shadowgraph method, the pressure measurement with a filmgauge, and the FEM numerical simulation were executed. The numerical results showed qualitative and quantitative agreements with the experimental results.
In addition, we carried out the generation experiment of characteristic shock pressure profiles using several types of impactor; piston and nozzle type container, and an aluminum diaphragm in the container. As a result, we succeeded in generation of the shock pressure profile with long duration, typically positive shock pressure, and vice versa.
The bio-experiment for the inactivation effect of a marine Vibrio sp. using the characteristic shock pressure profiles was executed, in order to discuss the direct and indirect inactivation effects of the shock pressure. We obtained the conclusion that dynamic inactivation effect to the marine bacterium arises remarkably at the pressure levels higher than about 400 Mpa, while chemical inactivation effect of the free radical generated by the negative shock pressure can be remarkable at low shock pressure levels.
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