| Project/Area Number |
26630062
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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| Allocation Type | Multi-year Fund |
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| Research Field |
Thermal engineering
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| Research Institution | Tokyo Institute of Technology |
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Principal Investigator |
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| Co-Investigator(Renkei-kenkyūsha) |
Kirschvink Joseph 東京工業大学, 地球生命研究所, 教授 (80721258)
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| Project Period (FY) |
2014-04-01 – 2017-03-31
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| Project Status |
Completed (Fiscal Year 2016)
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| Budget Amount *help |
¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2016: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2015: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2014: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
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| Keywords | 生体内マグネタイト / 氷晶核 / 残留磁化測定 / 過冷却 / 生体内マグネタイト氷晶モデル / Biomagnetite / SQUID magnetometory / Biogenic magnetite / Temperature monitoring / Contamination |
|---|
| Outline of Final Research Achievements |
Our theory holds that these weak magnetic fields could be inhibiting ice-crystal nucleation on the nanocrystals of biological magnetite (Fe3O4, an inverse cubic spinel) that are present in many plant and animal tissues by causing them to oscillate. Here we report that the addition of finely-dispersed magnetite to ultrapure water samples reduces the incidence of supercooling, as measured with multiple-thermocouple experiments conducted using a standardized freezing apparatus. The probability of achieving supercooling in water samples also decreases with increasing levels of ferromagnetic contamination as measured through superconducting moment magnetometry. We also report an interesting relationship between the volume change of ice and the initial degree of supercooling, that may indicate lower degassing during the crystallization of supercooled water.
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