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Related Concept Videos

Finding Electric Potential From Electric Field01:13

Finding Electric Potential From Electric Field

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For a system of charges, it is easy to calculate the system's potential because potential is a scalar quantity. However, in some instances where calculating the electric field is more straightforward than finding the potential, the electric field is used to calculate the system's potential. For a positive charge, the electric field is radially outward, and the potential is positive at any finite distance from the positive charge. In such an electric field, the motion away from the...
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The electric field and electric potential are related to each other. If the electric field at various points in the region of interest is known, it can be used to calculate the electric potential difference between any two points. Similarly, if the electric potential is known for various points, then it is possible to calculate the electric field.
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When an electric field accelerates a free positive charge, it acquires kinetic energy. This process is analogous to an object being accelerated by a gravitational field as if the charge were going down an electrical hill where its electric potential energy is converted into kinetic energy, although, of course, the sources of the forces are very different. The electrostatic or Coulomb force acting on the positive test charge is conservative, which means that the work done on a test charge is...
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Electrical Systems01:21

Electrical Systems

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In electrical engineering, the analysis of networks composed of passive linear components — resistors (R), capacitors (C), and inductors (L) — is fundamental. These components are organized into circuits where the relationship between input and output can be analyzed using transfer functions. The transfer function of an RLC circuit, which relates the voltage across a capacitor to the input voltage, can be derived using Kirchhoff's laws.
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Electric Charges01:11

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From lightning during thunderstorms to electronic devices, the phenomenon of electromagnetism is all around us. The electromagnetic force is one of the four fundamental forces of nature. It has been known to humanity in various forms for thousands of years. For example, the ancient Greek philosopher Thales of Miletus recorded his experiments on static electricity using amber and fur in the sixth century BC.
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Consider two point charges, each exerting Coulomb force on the other. It is possible to describe the Coulomb interaction via an intermediate step by defining a new physical quantity called the electric field.
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An Electrically Activated Nanobody Biosensor for On-Demand Detection.

Hannah K Williamson1, Paula M Mendes1

  • 1School of Chemical Engineering, University of Birmingham, Birmingham B15 2TT, UK.

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Summary

We developed an adaptive nanobody sensing platform for on-demand target detection. This electroresponsive system offers programmable, high-performance molecular detection for various applications.

Keywords:
dynamic systemselectro-activationnanobodyon-demand sensingresponsive peptidesself-assembled monolayers

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Area of Science:

  • Biotechnology
  • Molecular Sensing
  • Nanotechnology

Background:

  • Conventional nanobody platforms lack control in dynamic environments due to static, exposed binding sites.
  • Dynamic, on-demand target detection is crucial for biomanufacturing, diagnostics, and environmental monitoring.

Purpose of the Study:

  • To introduce an adaptive, on-demand sensing nanobody platform for controlled molecular detection.
  • To leverage electrically responsive oligopeptides to gate nanobody binding sites.

Main Methods:

  • Developed an electroresponsive nanobody platform using oligopeptides to control antigen-binding site accessibility.
  • Utilized electrical activation to switch binding sites between OFF (shielded) and ON (exposed) states.
  • Integrated independently addressable electrodes for multiplexed detection.

Main Results:

  • Achieved >80% efficiency in revealing binding sites upon electrical activation for real-time, selective detection.
  • Demonstrated high sensitivity (pg/mL) over a broad dynamic range (pg/mL-μg/mL).
  • Confirmed reliable performance in complex biological matrices like serum and cell culture media.

Conclusions:

  • The electroresponsive nanobody platform enables programmable, on-demand molecular detection.
  • This adaptive system represents a new paradigm for high-performance sensing in dynamic settings.
  • The technology has significant potential for advancements in biomanufacturing, diagnostics, and environmental monitoring.