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Related Concept Videos

Biological Effects of Radiation02:59

Biological Effects of Radiation

All radioactive nuclides emit high-energy particles or electromagnetic waves. When this radiation encounters living cells, it can cause heating, break chemical bonds, or ionize molecules. The most serious biological damage results when these radioactive emissions fragment or ionize molecules. For example, α and β particles emitted from nuclear decay reactions possess much higher energies than ordinary chemical bond energies. When these particles strike and penetrate matter, they produce ions...
Mutations01:35

Mutations

Mutations are changes in the sequence of DNA. These changes can occur spontaneously or they can be induced by exposure to environmental factors. Mutations can be characterized in a number of different ways: whether and how they alter the amino acid sequence of the protein, whether they occur over a small or large area of DNA, and whether they occur in somatic cells or germline cells.
Chromosomal Alterations Are Large-Scale Mutations
While point mutations are changes in a single nucleotide in...
Mutations01:39

Mutations

Overview
Long-patch Base Excision Repair01:02

Long-patch Base Excision Repair

Since the discovery of the two BER pathways, there has been a debate about how a cell chooses one pathway over the other and the factors determining this selection. Numerous in vitro experiments have pointed out multiple determinants for the sub-pathway selection. These are:
Isotopes and Radioisotopes01:28

Isotopes and Radioisotopes

In the early 1900s, English chemist Frederick Soddy realized that an element could have atoms with different masses that were chemically indistinguishable. These different types are called isotopes — atoms of the same element that differ in mass. Isotopes differ in mass because they have different numbers of neutrons but are chemically identical because they have the same number of protons. Soddy was awarded the Nobel Prize in Chemistry in 1921 for this discovery.
An isotope containing more...
Base-pairing and DNA Repair02:27

Base-pairing and DNA Repair

Erwin Chargaff’s rules on DNA equivalence paved the way for the discovery of base pairing in DNA. Chargaff’s rules state that in a double-stranded DNA molecule,

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Related Experiment Video

Updated: Jun 27, 2026

Irradiator Commissioning and Dosimetry for Assessment of LQ α and β Parameters, Radiation Dosing Schema, and in vivo Dose Deposition
06:20

Irradiator Commissioning and Dosimetry for Assessment of LQ α and β Parameters, Radiation Dosing Schema, and in vivo Dose Deposition

Published on: March 11, 2021

[Radiobiology base change: long term effects of ionizing radiation].

A Behar1

  • 1Université de Paris 13.

Bulletin Et Memoires De L'Academie Royale De Medecine De Belgique
|November 26, 2008
PubMed
Summary

Radiobiology now focuses on biological effects of radiation, not just physical ones. New research explores genomic instability, bystander effects, and abscopal effects, potentially revolutionizing radiation protection strategies.

Area of Science:

  • Radiobiology
  • Radiation Biology
  • Molecular Biology

Background:

  • Historically, radiobiology emphasized physical aspects of radiation and cellular impact.
  • Traditional research relied heavily on cell death measurements to study DNA damage and repair.
  • Mathematical models were used to analyze DNA damage, but experimental validation was limited.

Discussion:

  • Modern radiobiology is shifting towards a biological focus, investigating energy deposition effects.
  • Genomic instability, the amplification of gene signals in surviving cells post-irradiation, is a key area of study.
  • The bystander effect highlights intercellular communication of radiation-induced damage signals.
  • The abscopal effect describes radiation responses occurring distant from the irradiated site.
  • Clastogenic factors in patient plasma indicate systemic effects of radiation exposure.

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Use of a Linear Accelerator for Conducting In Vitro Radiobiology Experiments
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Use of a Linear Accelerator for Conducting In Vitro Radiobiology Experiments

Published on: May 26, 2019

Related Experiment Videos

Last Updated: Jun 27, 2026

Irradiator Commissioning and Dosimetry for Assessment of LQ α and β Parameters, Radiation Dosing Schema, and in vivo Dose Deposition
06:20

Irradiator Commissioning and Dosimetry for Assessment of LQ α and β Parameters, Radiation Dosing Schema, and in vivo Dose Deposition

Published on: March 11, 2021

Use of a Linear Accelerator for Conducting In Vitro Radiobiology Experiments
06:08

Use of a Linear Accelerator for Conducting In Vitro Radiobiology Experiments

Published on: May 26, 2019

Key Insights:

  • Genomic instability offers a dose-independent measure of radiation effects.
  • Bystander and abscopal effects reveal non-targeted and systemic impacts of ionizing radiation.
  • Clastogenic factors suggest circulating agents mediate radiation damage.
  • These findings challenge traditional radiobiological models and radioprotection paradigms.

Outlook:

  • Re-evaluation of radiation protection principles is necessary based on new biological insights.
  • Further research into intercellular signaling and systemic effects is crucial.
  • Understanding these complex radiobiological phenomena will advance radiation therapy and safety protocols.