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Intermolecular forces (IMF) are electrostatic attractions arising from charge-charge interactions between molecules. The strength of the intermolecular force is influenced by the distance of separation between molecules. The forces significantly affect the interactions in solids and liquids, where the molecules are close together. In gases, IMFs become important only under high-pressure conditions (due to the proximity of gas molecules). Intermolecular forces dictate the physical properties of...
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Spin systems where the difference in chemical shifts of the coupled nuclei is greater than ten times J are called first-order spin systems. These nuclei are weakly coupled, and their chemical shifts and coupling constant can generally be estimated from the well-separated signals in the spectrum.
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Electricity is generated by either electrons or ions flowing through a solution or a conducting medium. This flow of electrons or specifically electrical charge is defined as an electric current. When electrons move through a wire, they generate an electric current. It can be recalled  that in a redox reaction, electrons are lost and gained. In the spontaneous redox reaction of zinc  with copper, when zinc is immersed in a copper ion solution, a transfer of electrons from one substance to...
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The formation of a solution is an example of a spontaneous process, a process that occurs under specified conditions without energy from some external source.
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Seedless Growth of Bismuth Nanowire Array via Vacuum Thermal Evaporation
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Ultraflexible Nanowire Array for Label- and Distortion-Free Cellular Force Tracking.

P Paulitschke1, F Keber1, A Lebedev1

  • 1Center for NanoScience & Faculty of Physics , Ludwig-Maximilians-Universität München , Geschwister-Scholl-Platz 1 , 80539 München , Germany.

Nano Letters
|November 15, 2018
PubMed
Summary
This summary is machine-generated.

We developed a novel nanowire array biosensor to measure cell forces with high precision. This technology offers label-free, distortion-free cellular force transduction for deeper insights into cell mechanics.

Keywords:
Dictyostelium discoideumNanowire arraycellular force trackinglabel-free biosensingoptical distortionsspring constant

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Area of Science:

  • Biophysics
  • Cellular Mechanics
  • Nanotechnology

Background:

  • Living cells exert mechanical forces on their environment, regulating crucial cellular functions.
  • Understanding these forces provides insights into the physics of life.
  • Existing cellular force sensing methods face limitations like optical distortions.

Purpose of the Study:

  • To develop a novel nanostructured, ultraflexible nanowire array biosensor for probing cell-induced forces.
  • To enhance the functionality and sensitivity of cellular force sensing devices.
  • To achieve high-resolution, label-free detection of cellular forces.

Main Methods:

  • Fabrication of a top-down nanostructured, ultraflexible nanowire array biosensor using inverted conical semiconductor nanowires.
  • Separation of microscopy on nanowire heads from cell confinement within the array to prevent optical distortions.
  • Conversion of undistorted nanowire displacements into cellular forces using the nanowire spring constant.

Main Results:

  • Demonstrated a distortion-free cellular force transducer with high resolution.
  • Achieved label-free sensing of cell-induced forces using optical microscopy.
  • Probed cell-induced forces with a resolution of 50 piconewtons (pN) in a study with migrating Dictyostelium discoideum cells.
  • Showcased potential for force resolution in the 100 femtonewton (fN) range with highly flexible nanowires.

Conclusions:

  • The developed nanowire array biosensor enables precise measurement of cellular forces.
  • This technology offers a significant advancement in label-free, high-resolution biophysical sensing.
  • The findings open new avenues for studying cell mechanics and the physics of life.