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Relaxation process and dynamic heat capacity at the main transition of multi-lamellar vesicles of phosphatidylcholines

Research Project

Project/Area Number 08454111
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field 物理学一般
Research InstitutionTokyo Institute of Technology

Principal Investigator

EMA Kenji  Tokyo Institute of Technology, Faculty of Science, Associate Professor, 理学部, 助教授 (80108183)

Co-Investigator(Kenkyū-buntansha) YAO Haruhiko  Tokyo Institute of Technology, Faculty of Science, Research Associate, 理学部, 助手 (60212271)
Project Period (FY) 1996 – 1997
Project Status Completed (Fiscal Year 1997)
Budget Amount *help
¥6,200,000 (Direct Cost: ¥6,200,000)
Fiscal Year 1997: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 1996: ¥5,200,000 (Direct Cost: ¥5,200,000)
Keywordsphospholipid / phase transition / relaxation process / dynamic heat capacity
Research Abstract

At the first stage of the research, the unilamellar vasicle samples with various alkyl chain length have been studied. For the measurements with chain length from 12 to 15, it was found that the heat anomaly accompanying the transition depends significantly on the chain length. It was also found that the unilamellar sample with chain length 12 shows an intermediate phase, which is similar to the multilamellar sample with the same chain length. A detailed analysis of these results has revealed that the observed chain-length dependence of the anomaly can be described with the modified Izuyama-Akutsu theory which has been proposed by the present authors to explain the vesicle-size dependence of the heat anomaly. It is expected from this modified theory that we can reach a critical point by adjusting the vesicle size and the chain length. We found that the sample with 30 nm diameter with chain length 15 is close to the critical point. A preliminary analysis shows that the critical exponent has a value alpha=0.5-0.7. More detailed analyzes are in progress. Although the measurement on multilamellar vesicles is behind the schedule, the results on unimalellar vesicles described above serve as a good background for future studies both on unilamellar and multilamellar vesicles.

Report

(3 results)
  • 1997 Annual Research Report   Final Research Report Summary
  • 1996 Annual Research Report
  • Research Products

    (5 results)

All Other

All Publications (5 results)

  • [Publications] Koji Uchida et al.: "Fffect of chain length on the heat-capacity anomaly at the gel to liquid-crystalline phase transition in unilamellar vesicles of phosphatidylcholines" Phys.Rev.E. 56. 661-666 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Haruhiko Yao et al.: "Nonadiabatic scanning calorimeter" Rev.Sci.Instrum.69. 172-178 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] K.Uchida, H.Yao, and K.Ema: "Effect of chain length on the heat-cpacity anomaly at the gel to liquid-crysalline phase transition in unilamellar vesicles of phosphatidylcholines" Phys.Rev.E. 56. 661-666 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] H.Yao, K.Ema, and C.W.Garland: "Nonadiabatic scanning calorimeter" Rev.Sci.Instrum.69. 172-178 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1997 Final Research Report Summary
  • [Publications] Koji Uchida: "Effect of chain length on the heat-capacity anomaly at the gel to liquid-crystalline phase transition in unilamellar vesicles of phosphafidylcholines" Physical Review E. 56・1. 661-666 (1997)

    • Related Report
      1997 Annual Research Report

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Published: 1996-04-01   Modified: 2016-04-21  

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