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Related Concept Videos

Atomic Force Microscopy01:08

Atomic Force Microscopy

Atomic force microscopy (AFM) is a type of scanning probe microscopy that can analyze topographic details of various specimens like ceramics, glass, polymers, and biological samples. AFM offers over 1000 times more resolution than the optical imaging system. Images generated from AFM are three-dimensional surface profiles, offering an advantage over the flat, two-dimensional images from other imaging techniques.
The AFM Probe
The probe is regarded as the heart of any AFM setup and comprises the...

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Sub-nanometer Resolution Imaging with Amplitude-modulation Atomic Force Microscopy in Liquid
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Different interactions between the two sides of purple membrane with atomic force microscope tip.

Sheng Zhong1, Hui Li, Xin-Yong Chen

  • 1Institute of Biophysics, Chinese Academy of Sciences, 15 Datun Road, Chaoyang District, Beijing 100101, China.

Langmuir : the ACS Journal of Surfaces and Colloids
|March 16, 2007
PubMed
Summary

Atomic force microscopy (AFM) can now distinguish purple membrane (PM) sides. This method uses surface topography differences, overcoming previous limitations in charge density measurement.

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Area of Science:

  • Biophysics
  • Surface Science
  • Microscopy

Background:

  • Atomic force microscopy (AFM) is used to measure surface charge density via the DLVO model.
  • Previous AFM studies could not differentiate charge densities on the extracellular and cytoplasmic sides of purple membrane (PM).

Purpose of the Study:

  • To develop a straightforward method for distinguishing the extracellular and cytoplasmic sides of PM using AFM.
  • To investigate the influence of salt concentration on PM imaging and electrostatic interactions.

Main Methods:

  • Tapping-mode AFM with thioglycolate-modified tips was employed to image PM.
  • Experiments were conducted in buffers with varying salt concentrations (e.g., 25 mM KCl).
  • Force-distance curves were analyzed to understand tip-sample interactions.

Main Results:

  • PM samples exhibited two distinct topographies (flat and domelike) in low salt concentrations (25 mM KCl), which disappeared at high salt concentrations.
  • Flat topography correlated with the extracellular side, while domelike topography indicated the cytoplasmic side.
  • Force curves revealed different electrostatic interactions, with cytoplasmic side curves showing longer decay lengths attributed to bacteriorhodopsin's C-terminus flexibility.

Conclusions:

  • AFM topography imaging provides a simple method to distinguish PM's extracellular and cytoplasmic sides without high-resolution imaging.
  • The observed differences in topography and force curves highlight distinct surface properties and electrostatic interactions of the two PM sides.
  • The flexibility of the C-terminus of bacteriorhodopsin likely influences the electrostatic interactions on the cytoplasmic side.