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Related Concept Videos

Types of Forces01:09

Types of Forces

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In most situations, forces can be grouped into two categories: contact forces and field forces.  Contact forces occur as a result of direct physical contact between objects. Field forces, however, act without the necessity of physical contact between objects. They depend on the presence of a "field" in the region of space surrounding the body under consideration. You can think of a field as a property of space that is detectable by the forces it exerts. Scientists think there...
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Force01:06

Force

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Forces affect every moment of our life. Our bodies are held to the Earth by force, and they are held together by the forces of charged particles. When we open a door, walk down a street, lift a fork, or touch a baby's face, we are applying force. Our body's atoms are held together by electrical forces, and the core of an atom, called the nucleus, is held together by the strongest force known to us—nuclear force.
The study of motion is called kinematics, but kinematics only...
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Comparison Between Electrical And Gravitational Forces01:24

Comparison Between Electrical And Gravitational Forces

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There are four fundamental forces in nature: the gravitational force, the electromagnetic force, the strong nuclear force, and the weak nuclear force. To compare the numerical strengths of the first two, take two particles of the same kind. Since electrons are fundamental particles, they are a good example.
Since both are inverse square law forces, the distance gets canceled when the ratio of the two forces is considered. Instead, the ratio of the electrical and gravitational forces depends on...
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Atomic Nuclei: Nuclear Spin State Overview01:03

Atomic Nuclei: Nuclear Spin State Overview

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NMR-active nuclei have energy levels called 'spin states' that are associated with the orientations of their nuclear magnetic moments. In the absence of a magnetic field, the nuclear magnetic moments are randomly oriented, and the spin states are degenerate. When an external magnetic field is applied, the spin states have only 2 + 1 orientations available to them. A proton with = ½ has two available orientations. Similarly, for a quadrupolar nucleus with a nuclear spin value of...
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Nuclear Stability03:18

Nuclear Stability

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Protons and neutrons, collectively called nucleons, are packed together tightly in a nucleus. With a radius of about 10−15 meters, a nucleus is quite small compared to the radius of the entire atom, which is about 10−10 meters. Nuclei are extremely dense compared to bulk matter, averaging 1.8 × 1014 grams per cubic centimeter. If the earth’s density were equal to the average nuclear density, the earth’s radius would be only about 200 meters.
To hold positively charged protons together...
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Nuclear Binding Energy02:13

Nuclear Binding Energy

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The difference between the calculated and experimentally measured masses is known as the mass defect of the atom. In the case of helium-4, the mass defect indicates a “loss” in mass of 4.0331 amu – 4.0026 amu = 0.0305 amu. The loss in mass accompanying the formation of an atom from protons, neutrons, and electrons is due to the conversion of that mass into energy that is evolved as the atom forms. The nuclear binding energy is the energy produced when the atoms’ nucleons...
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Updated: Jun 4, 2025

Direct Force Measurements of Subcellular Mechanics in Confinement using Optical Tweezers
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Cellular and Nuclear Forces: An Overview.

Bidisha Sinha1, Arikta Biswas1, Saurabh Kaushik2

  • 1Indian Institute of Science Education and Research Kolkata, Mohanpur, West Bengal, India.

Methods in Molecular Biology (Clifton, N.J.)
|December 20, 2024
PubMed
Summary
This summary is machine-generated.

Cells sense their environment using nanoscale force sensors, triggering internal physical and chemical responses. This process influences gene expression and is crucial for cellular homeostasis and differentiation, though mechanisms remain unclear.

Keywords:
AFMMechanosensingMembrane tensionMicrofluidicsMicrorheologyNuclear forcesOptical tweezersPolymerization forcesViscoelasticity

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Area of Science:

  • Cell biology
  • Biophysics
  • Molecular biology

Background:

  • Cells utilize nanoscale force sensors to probe their microenvironment, initiating intracellular physical and chemical signals.
  • These signals propagate through the cytoskeleton to the nucleus, altering chromatin and gene expression.
  • This force/stress sensing mechanism is vital for cellular homeostasis, development, and differentiation.

Purpose of the Study:

  • To review known molecular players in cellular and nuclear force sensing.
  • To explore the mechanistic aspects of signal transduction from cell surface to chromatin.
  • To introduce biophysical concepts and techniques relevant to force sensing.

Main Methods:

  • Literature review of molecular players in force sensing.
  • Discussion of biophysical concepts and experimental techniques.
  • Analysis of signal transduction pathways (physical and chemical).

Main Results:

  • Progress has been made in identifying molecular components of force sensing.
  • The precise mechanisms of signal transduction and nuclear response are not fully understood.
  • A framework for understanding force-dependent cellular design principles is emerging.

Conclusions:

  • Further research is needed to elucidate the complex signaling cascades involved in force sensing.
  • Understanding these mechanisms is key to comprehending cellular regulation and function.
  • This review provides a foundation for future investigations into cell mechanosensing.