| 研究生: |
蘇園登 Su, Yuan-Deng |
|---|---|
| 論文名稱: |
利用表面電漿子顯微術與微米製作技術於細胞與基質接觸之研究 Study of Cell-substrate Contact via Surface Plasmon Phase Microscopy and Microfabrication |
| 指導教授: |
陳顯禎
Chen, Shean-Jen |
| 共同指導教授: |
保羅 坎帕尼奧拉
Paul J. Campagnola |
| 學位類別: |
博士 Doctor |
| 系所名稱: |
工學院 - 工程科學系 Department of Engineering Science |
| 論文出版年: | 2010 |
| 畢業學年度: | 98 |
| 語文別: | 英文 |
| 論文頁數: | 113 |
| 中文關鍵詞: | 表面電漿子 、相位量測 、細胞外基質 、細胞影像 |
| 外文關鍵詞: | surface plasmon polariton, phase measurement, extracellular matrix, cell images |
| 相關次數: | 點閱:100 下載:3 |
| 分享至: |
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表面電漿子(surface plasmon polariton,SPP)相位影像系統不僅可以獲得較高靈敏度的界面之厚度或介電常數變化之相位資訊,而且可以提供大量平行空間影像。本論文中發展出一共光程移相干涉(phase-shift interferometry,PSI)之SPP顯微術來觀測空間平面上之相位資訊,配合五步相位還原演算法來完成相位的重建,量測奈米膜層之相位影像差異,並且討論此干涉方式之長時間相位穩定與空間解析度。此影像系統具有高靈敏度之特性可以量到2x10-7 RIU的折射率變化,並且由於其為一共光程干涉術所以具有相當高之相位穩定,於長時間下之相位穩定可達2.5x10-4π。此系統提供了高解析與高通量之DNA微陣列量測之能力,且不需要對其作額外的螢光標定,不僅如此還可提供量化的依據。而在蛋白質的量測上還結合了微機電製程之微流道系統,實現多通道蛋白質生物分子量測。
為了觀察細胞之貼附與爬行之情形,本論文中發展了兩套SPP顯微影像系統,並且結合衰逝全反射螢光顯微鏡於細胞貼附之研究。一為傳統菱鏡偶合方式,另一用高數值孔徑之顯微油鏡偶合方式以增進顯微影像之品質,文中比較了此兩系統之優缺點及其限制之外並將其運用於細胞貼附之學習。另外,比較了利用強度與相位量測之實驗結果,相位量測之靈敏度高於強度量測約160倍左右。首先,此SPP相位影像系統用於超過兩個小時之細胞凋亡觀察。細胞與生物基材之接觸影像所相互對應之表面電漿共振(surface plasmon resonance,SPR)角度可以由改變入射角從70到78度掃描之SPP相位量測所獲得。再根據SPR角之影像資訊與多層膜之模擬結果可進一步得知活體黑色素瘤細胞與牛血清蛋白基材之接觸距離資訊。
最後,利用飛秒(femtosecond)雷射製造出細胞外間質(extracellular matrix,ECM)之交聯結構,此方式可於特定地方製造出二維甚至三維之生物結構,創造了具有線性濃度梯度分佈之纖維蛋白結構,並藉此控制纖維母細胞之爬行與貼附型態之改變。細胞與此結構化之ECM接觸之行為也可透過此SPP相位顯微鏡做進一步的學習與討論。
Surface plasmon polariton (SPP) phase image system can not only obtain high sensitivity phase information of thickness or dielectric constant change but also provide high-throughput spatial information. A common-path phase-shift interferometry (PSI) SPP image system has been developed to measure the nano-layer at sensing surface. The system uses five-step phase reconstruct algorithm to obtain the spatial phase information. It has very high sensitivity and the limitation of measurement can achieve 2x10-7 reflect index unit (RIU). Moreover, the phase stability can achieve 2.5x10-4 π in long-term measurement due to the common-path setup. The imaging system offers high resolution and high-throughput screening capabilities for microarray DNA image without the need for additional labeling, and provides valuable quantitative information. It also combines with a microfluidic system which is fabricated by MEMS to achieve the measurement of multichannel protein chip.
To study the behavior of cell-biosubstrate contacts, two kinds of system configuration for SPP phase microscopy are developed. One is based on prism coupling and the other one is high numerical aperture objective-based coupling. The sensitivity comparison of intensity and phase demonstrates that the sensitivity of the phase measurement is 160-fold greater than that of the intensity measurement. Also, a more than 2-hour cell apoptosis observation via the SPP phase microscopy is presented. To implement the incident angle from 70° to 78°, cell-biosubstrate contact images corresponding to surface plasmon resonance (SPR) angles are obtained by utilizing the SPP phase measurement. According to the information of the corresponding SPR angle images and a multilayer simulation, the contact distances between a living melanoma cell and a bovine serum albumin substrate at four different locations have been estimated.
Finally, a femtosecond laser is utilized to fabricate a cross-linked extracellular matrix (ECM) with arbitrary shape and concentration. It can form two-dimensional or even three-dimensional biometrical specificities. Fibronectin with a linear gradient concentration is fabricated and it is utilized to control the cell migration, adhesion, and differentiation of fibroblast cells. The behaviors of cell contacts with the ECM structures have been studied via the SPP phase microscopy.
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