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Related Concept Videos

Electrochemical Cells01:28

Electrochemical Cells

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Electrochemical cells are systems that convert chemical energy into electrical energy or use electrical energy to drive chemical reactions. They consist of two electrodes in contact with an electrolyte, where redox reactions enable electron transfer. Most electrochemical cells include two half-cells connected by an external wire for electron flow and a salt bridge for ion flow. The salt bridge contains an electrolyte solution and maintains charge neutrality by allowing ions—not...
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Surface Charge Visualization at Viable Living Cells.

David Perry1, Binoy Paulose Nadappuram1, Dmitry Momotenko1

  • 1Department of Chemistry, ‡MOAC Doctoral Training Centre, §Division of Metabolic and Vascular Health, Warwick Medical School, and ∥School of Life Sciences, University of Warwick , Coventry CV4 7AL, United Kingdom.

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|February 13, 2016
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Summary
This summary is machine-generated.

Scanning ion conductance microscopy (SICM) offers nanoscale surface charge mapping of living cells. This technique reveals new insights into cellular functions by analyzing surface charge distributions in plant and human cells.

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Area of Science:

  • Biophysics
  • Cell Biology
  • Nanotechnology

Background:

  • Accurate nanoscale surface charge mapping is crucial for understanding cellular functions.
  • Existing techniques have limitations in resolving surface charge at high spatial resolution on living cells.

Purpose of the Study:

  • To demonstrate scanning ion conductance microscopy (SICM) as a powerful tool for quantitative nanoscale surface charge mapping of living cells.
  • To simultaneously measure cell topography and surface charge at cellular interfaces with high spatial resolution.

Main Methods:

  • Utilized a bias modulated (BM) scheme with a nanopipette and quasi-reference counter electrodes (QRCE).
  • Probed diffuse double layer (DDL) properties for surface charge elucidation.
  • Employed pixel-level self-referencing and a theoretical model for analysis.

Main Results:

  • Successfully mapped surface charge on living Zea mays root hairs, identifying high negative surface charge at the tip.
  • Revealed distinct surface charge distributions on human adipocyte cells.
  • Demonstrated sensitivity under both low and high ionic strength conditions.

Conclusions:

  • SICM provides dynamic potential measurements for simultaneous topography and surface charge mapping.
  • Identified previously unrecognized surface charge features on plant and human cells.
  • These findings have implications for understanding cellular functions and interactions.