| Project/Area Number |
09680846
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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 |
Biomedical engineering/Biological material science
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| Research Institution | THE UNIVERSITY OF TOKYO |
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Principal Investigator |
SHIBATA Masahiro THE UNIV OF TOKYO,GRAN SCH OH MED,ASSIST PROF, 大学院・医学系研究科, 講師 (60158954)
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| Co-Investigator(Kenkyū-buntansha) |
KAMIYA Akira THE UNIV OF TOKYO,GRAN SCH OH MED,PROF, 大学院・医学系研究科, 教授 (50014072)
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| Project Period (FY) |
1997 – 1998
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| Project Status |
Completed (Fiscal Year 1998)
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| Budget Amount *help |
¥3,500,000 (Direct Cost: ¥3,500,000)
Fiscal Year 1998: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1997: ¥2,800,000 (Direct Cost: ¥2,800,000)
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| Keywords | Intravital microscopy / Laser / Fluorescence illuminator / FITC-dextran / Microvasculature / Vascular permeability / Hamster cheek pouch |
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| Research Abstract |
We have developed a new fluorescence intravital microscope of long working distance (39 mm) for the observation of microcirculation in a wide visual field by designing a simple epi-illumination technique with dual laser beams. Cross-illumination, in which a pair of laser beams is symmetrically placed on either side of the objective such that they intersect at the focal plane of the objective, was employed to produce uniform distribution of the incident light in the object plane. In vitro experiments using a fluorescein isothiocyanate dextran (FITC-dextran ; molecular weight = 70,000) solution of known concentration confirmed uniform tracer excitation in a wide visual field (approximately 30 mm^2), and a linear correlation between fluorescence intensity and tracer concentration (r = 0.999), ranging between 5 mumol/L and 25 mumol/L.In vivo observations in the microcirculation of a hamster cheek pouch indicated that the present technique had the advantage of high contrast compared with the image obtained by bright-field trans-illumination. This microscope illuminator may prove useful for the evaluation of vascular permeability under physiological and inflammatory conditions, with sufficient quantitative reliability to determine tracer concentrations in all parts of the micro vascular network. Furthermore, a long working distance in this technique could have considerable advantages for the application to nail-fold capillaroscopy in humans.
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