| Project/Area Number |
61480473
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| Research Category |
Grant-in-Aid for General Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
分子遺伝学・分子生理学
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| Research Institution | The Toky Metropolitan Institute of Medical Science |
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Principal Investigator |
TSUKITA Shoichiro The Tokyo Metropolitan Institute of Medical Science, Department Director, 超微形態研究部門, 室長 (50155347)
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| Project Period (FY) |
1986 – 1987
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| Project Status |
Completed (Fiscal Year 1987)
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| Budget Amount *help |
¥7,300,000 (Direct Cost: ¥7,300,000)
Fiscal Year 1987: ¥1,500,000 (Direct Cost: ¥1,500,000)
Fiscal Year 1986: ¥5,800,000 (Direct Cost: ¥5,800,000)
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| Keywords | Rapid Freezing / Electron Microscopy / Skeletal Muscle / Retina / Axon / 時間分解能 / 液体ヘリウム / 興奮収縮連関 / 光受容 |
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| Research Abstract |
Recent progress in the rapid freezing electron microscope technique has greatly improved the temporal resolution of the images that can be obtained. The temporal resolution is known to be at least 2 msec. In this project, we have attempted to develop a new freezing system in which the following biological specimens can be rapidly frozen while measuring their physiological conditions at the very moment of freezing.
1.Rabbit Glycerol-treated Skeletal Muscle under the Condition of Isotonic Contraction: In the shortening muscle, even in a unloaded condition, most myosin heads are situated along the helix of actin filaments, and that the myosin heads maintain the axial spacing of the myosin subunit repeat (143 A).
2.Frog Living Skeletal Muscle under the Condition of Isometric Contraction: The excitation-contraction coupling in the skeletal muscle is accompanied by the remarkable structural changes of the sarcoplasmic reticulum and transverse-tubules including the dissociation of their junctions. 3.Dark-and Light-adapted Squid Retina: A dark-adapted microvillus is characterized unequivocally by an axial filament which is regularly associated with the granular components and cross-linked to the membrane through the slender strands, and that light-illimination induces the dissociation of granular components from the axial filaments and the fragmentation of the axial filaments.
4.Squid Gilant Axon: The axolemma of the squid giant axon is specialized into two domains (microtubule- and microfilament-associated domains) by its underlying cytoskeletons.
These 'instantaneous' views will lead us to better understanding of the molecular mechanisms of muscle contraction, excitation-contraction coupling, light sensation, and membrane excitation.
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