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Related Concept Videos

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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.
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Nuclear magnetic resonance (NMR) is a phenomenon exhibited by certain nuclei that can absorb characteristic radio frequency radiation under certain conditions. NMR has been extensively applied in molecular spectroscopy and medical diagnostic imaging. In both these applications, the molecule or subject under study is placed in a magnetic field and irradiated with radio frequency energy.
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Atomic Nuclei: Nuclear Spin State Overview01:03

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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 one, the...
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Before mRNAs are exported to the cytoplasm, it is crucial to check each mRNA for structural and functional integrity. Eukaryotic cells use several different mechanisms, collectively known as mRNA surveillance, to look for irregularities in mRNAs. Irregular or aberrant mRNA are rapidly degraded by various enzymes. If a defective mRNA escapes the surveillance, it would be translated into a protein which would either be non-functional or not function properly. One of the primary irregularities in...
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The process of converting very light nuclei into heavier nuclei is also accompanied by the conversion of mass into large amounts of energy, a process called fusion. The principal source of energy in the sun is a net fusion reaction in which four hydrogen nuclei fuse and ultimately produce one helium nucleus and two positrons.
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Most DNA resides in the nucleus of a cell. However, some organelles in the cell cytoplasm⁠—such as chloroplasts and mitochondria⁠—also have their own DNA. These organelles replicate their DNA independently of the nuclear DNA of the cell in which they reside. Non-nuclear inheritance describes the inheritance of genes from structures other than the nucleus.
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Imaging Integrin Tension and Cellular Force at Submicron Resolution with an Integrative Tension Sensor
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Cellular and Nuclear Forces: An Overview.

Bidisha Sinha1, Arikta Biswas1, Gautam V Soni2

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

Methods in Molecular Biology (Clifton, N.J.)
|July 5, 2018
PubMed
Summary
This summary is machine-generated.

Cells use nanoscale sensors to detect environmental forces, triggering responses that alter gene expression. This review explores the molecular players and biophysical concepts involved in cellular force sensing and nuclear response, crucial for homeostasis and differentiation.

Keywords:
Actomyosin cortexCell–cell adhesionMembrane tensionMicrorheologyNuclear mechanicsTraction stress

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Area of Science:

  • Cell biology
  • Biophysics
  • Molecular biology

Background:

  • Cells possess nanoscale force sensors on their surface to probe microenvironments.
  • These sensors initiate intracellular physical and chemical responses, influencing nuclear state and gene expression.

Purpose of the Study:

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

Main Methods:

  • Literature review of current research on cellular force sensing.
  • Analysis of molecular mechanisms underlying signal transduction pathways.
  • Discussion of biophysical principles governing cell mechanics and gene regulation.

Main Results:

  • Progress has been made in identifying molecular players in force sensing.
  • The precise mechanisms of signal transduction and nuclear response remain incompletely understood.
  • Force-dependent cellular responses are vital for homeostasis, development, and differentiation.

Conclusions:

  • Understanding force sensing mechanisms is crucial for deciphering cell behavior.
  • Further research is needed to elucidate the complex signaling cascades involved.
  • This review provides a framework for future investigations into force-dependent cellular design principles.