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| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Tees, D.F.J. Waugh, R.E. Hammer, D.A. |
| Copyright Year | 1999 |
| Description | Author affiliation: Dept. of Chem. Eng., Pennsylvania Univ., Philadelphia, PA, USA (Tees, D.F.J.) |
| Abstract | When a range of force loading rates, r/sub f/, is applied to single receptor-ligand bonds, a plot of the peak in the observed force distribution vs ln r/sub f/ yields the location of transition states in the bonding potential as well as estimates of the reverse reaction rate under zero load (Merkel et al., Nature, 397:50-3, 1999). This analysis was applied to the molecules that mediate rolling adhesion of leukocytes in blood vessels by adsorbing E-selectin onto 3 /spl mu/m-diam. glass fibers and coupling the selectin ligand, sialyl Lewis/sup x/ (sLe/sup x/) to latex microspheres. After gentle apposition of sphere and fiber by micromanipulation, the microsphere was retracted using a protocol that combines hydrodynamic and Hookean forces to apply a constant r/sub f/. The [sLe/sup x/] is titrated so adhesion occurs in only /spl sim/25% of tests, implying >80% single bonds (simulations show that a few multiple bonds have little effect on parameter estimation). The peak in the force distribution was determined from video microscopy for a variety of r/sub f/. The parameters agree with those predicted to produce rolling in Monte Carlo simulations of adhesion in flow. |
| File Size | 137575 |
| File Format | |
| ISBN | 0780356748 |
| ISSN | 1094687X |
| DOI | 10.1109/IEMBS.1999.802115 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 1999-10-13 |
| Publisher Place | USA |
| Access Restriction | Subscribed |
| Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Subject Keyword | Adhesives Bonding forces Potential well State estimation Yield estimation White blood cells Blood vessels Glass Optical fiber testing Protocols |
| Content Type | Text |
| Resource Type | Article |
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