| DC 欄位 |
值 |
語言 |
| DC.contributor | 生物物理研究所 | zh_TW |
| DC.creator | 朱怡苹 | zh_TW |
| DC.creator | Yi-Ping Chu | en_US |
| dc.date.accessioned | 2007-1-19T07:39:07Z | |
| dc.date.available | 2007-1-19T07:39:07Z | |
| dc.date.issued | 2007 | |
| dc.identifier.uri | http://ir.lib.ncu.edu.tw:88/thesis/view_etd.asp?URN=942210001 | |
| dc.contributor.department | 生物物理研究所 | zh_TW |
| DC.description | 國立中央大學 | zh_TW |
| DC.description | National Central University | en_US |
| dc.description.abstract | 我們提出一個理論模型描述受到外力下的受體-配體叢集，並且修正了在貝爾(Bell) 模型中受體-配體的結合率。藉由研究受體-配體鍵結數目的速率方程式(rate equation)，我們可以估計叢集的穩定度（生命期）。研究結果顯示當一具有N個平行受體-配體鍵結的叢集受到一外力F，叢集的生命期只和作用在一個受體-配體鍵結的力的大小f=F/N 有關。我們定義一臨界力fc：當f小於fc，叢集趨於穩定；當f大於fc，叢集的受體-配體鍵結會全部斷裂；當f等於fc，叢集的受體-配體鍵結會斷裂至一特定的鍵結數目（此時大部分的受體-配體是鍵結的），再經由鍵結受體-配體數的漲落使得叢集繼續斷裂。關於叢集的生命期，我們發現當f-> fc^+時，叢集的生命期小於貝爾模型的預測，並且正比於(f-fc)^(-1/2)。當(f-fc)/fc~O(1)時，叢集的生命期大於貝爾的預測，這主要是由於貝爾和我們的模型的初始受體-配體鍵結數目不同所造成。當f=fc 時，受體-配體鍵結數目的漲落變得重要，我們發現叢集的生命期正比於N^(1/3)。 | zh_TW |
| dc.description.abstract | We present a theoretical model that describes ligand-receptor cluster under external force. We modify the model of Bell [1] by considering the rebinding of broken bonds in a consistent way. The stability of the cluster is studied by the rate equation of Nb, the number of connected bonds. Our study reveals that for a cluster with N parallel bonds under external force F, the lifetime of the cluster depends only on the force acting on each bond f = F/N. There exists a critical force Fc = Nfc below which the cluster is stable and above which the cluster dissociates. When f = fc, the number of rupture events per unit time is equal to that of rebinding at Nb^* = Nnb^*. We find nb^*~1, i.e., the effect of rebinding is important when most of the bonds are connected. When f approaches fc from above, the cluster spends most of the time near nb^*, the true lifetime of the cluster is shorter than Bell’s prediction and has a power law behavior T ~(f − fc)^(−1/2). We also show that the true lifetime of the cluster is longer than Bell’s prediction when f is significantly greater than fc due to different number of connected bonds predicted by both theories in the absence of force. When f =fc, for a finite size cluster, the bond number fluctuation is important, the lifetime of the cluster is related to the cluster size by T ~N^(1/3). | en_US |
| DC.subject | 鍵結強度 | zh_TW |
| DC.subject | 叢集 | zh_TW |
| DC.subject | 受體-配體 | zh_TW |
| DC.subject | deterministic | en_US |
| DC.subject | strength | en_US |
| DC.subject | bond | en_US |
| DC.subject | ligand-receptor cluster | en_US |
| DC.title | 受體配體叢集在外力下的理論研究 | zh_TW |
| dc.language.iso | zh-TW | zh-TW |
| DC.title | Strength of ligand-receptor cluster under external force : deterministic model | en_US |
| DC.type | 博碩士論文 | zh_TW |
| DC.type | thesis | en_US |
| DC.publisher | National Central University | en_US |