Volume 92, Issue 3, Pages (February 2007)

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Volume 92, Issue 3, Pages 1005-1013 (February 2007) Diffusing Colloidal Probes of Protein and Synthetic Macromolecule Interactions W. Neil Everett, Hung-Jen Wu, Samartha G. Anekal, Hung-Jue Sue, Michael A. Bevan Biophysical Journal Volume 92, Issue 3, Pages 1005-1013 (February 2007) DOI: 10.1529/biophysj.106.094102 Copyright © 2007 The Biophysical Society Terms and Conditions

Figure 1 (A) Total internal reflection and video microscopy of 2.2μm silica colloids levitated above a microscope slide with and without transmitted light. (B) Schematic of total internal reflection, evanescent wave, and colloid scattering. (C) Schematic of BSA (ellipsoids) and PEO (brush layer) configurations on chemically modified surfaces. Biophysical Journal 2007 92, 1005-1013DOI: (10.1529/biophysj.106.094102) Copyright © 2007 The Biophysical Society Terms and Conditions

Figure 2 (A) Trajectories of BSA/APS-coated colloids on PEO5k/OTS-coated glass surface. Gray pixels indicate no CSA, and colored pixels indicate CSA times (right-side scale). (B) Single (black) and ensemble (red) colloid PEPs with and without gravitational potentials. (C) Ensemble average lateral MSDs in x (○) and y (▿) directions with curve fits (solid line), predictions (dashed line), and isolated single colloid diffusion (dotted line.). Biophysical Journal 2007 92, 1005-1013DOI: (10.1529/biophysj.106.094102) Copyright © 2007 The Biophysical Society Terms and Conditions

Figure 3 (A) Trajectories of BSA-coated colloids on BSA/Au-coated glass surface with same format as Fig. 2. (B) Single (black) and ensemble (red) deposited colloid PEPs with exponential curve fits. (C) Ensemble average lateral MSDs with same format as Fig. 2. Biophysical Journal 2007 92, 1005-1013DOI: (10.1529/biophysj.106.094102) Copyright © 2007 The Biophysical Society Terms and Conditions

Figure 4 (A) Trajectories of BSA/ODA-coated colloids on a PEO3k/OTS-coated glass surface with same format as Fig. 2. (B) Single colloid PEPs (black) without gravitational potentials and exponential curve fits (red) to vdW attraction. (C) Ensemble average lateral MSDs with same format as Fig. 2. Biophysical Journal 2007 92, 1005-1013DOI: (10.1529/biophysj.106.094102) Copyright © 2007 The Biophysical Society Terms and Conditions

Figure 5 (A) Trajectories of BSA/APScoated colloids on a BSA/APS-coated glass surface with same format as Fig. 2. (B) Single associating colloid (black) and ensemble (red) colloid PEPs without gravitational potentials. (C) Ensemble average lateral MSDs with same format as Fig. 2. Biophysical Journal 2007 92, 1005-1013DOI: (10.1529/biophysj.106.094102) Copyright © 2007 The Biophysical Society Terms and Conditions