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Related Concept Videos

Biological Effects of Radiation02:59

Biological Effects of Radiation

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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...
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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.
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Radiation: Applications01:17

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The average temperature of Earth is the subject of much current discussion. Earth is in radiative contact with both the Sun and dark space; it receives almost all its energy from the radiation of the Sun and reflects some of it into outer space. Dark space is very cold, about 3 K, so Earth radiates energy into it. For instance, heat transfer occurs from soil and grasses, the rate of which can be so rapid that frost can occur on clear summer evenings, even in warm latitudes.
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Immunotherapy is a treatment that boosts or manipulates the immune system to fight diseases, including cancer. For instance, by stimulating an immune response through vaccinations against viruses that cause cancers, like hepatitis B virus and human papillomavirus, these diseases can be prevented. Nonetheless, some cancer cells can avoid the immune system due to their rapid mutation and division. The immune response to many cancers involves three phases: elimination, equilibrium, and escape.
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DNA Distortion and Damage
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Author Spotlight: Radiotherapy and Clonogenic Assays for Advancing Cancer Research and Personalized Medicine
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Vitamin E Analogs as Radiation Response Modifiers.

Pankaj K Singh1, Sunil Krishnan1

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Vitamin E analogs, known as tocols, show promise as radioprotectors against ionizing radiation. Research explores their antioxidant and alternative mechanisms, comparing them to amifostine for radiation countermeasures.

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Area of Science:

  • Radiation biology
  • Radioprotective agents
  • Biochemistry

Background:

  • Ionizing radiation exposure poses life-threatening risks, necessitating effective countermeasures for radiological emergencies.
  • Despite advances, successful radiation countermeasures remain elusive.
  • Vitamin E, with antioxidant properties, and its analogs (tocols) are investigated for radioprotective potential.

Purpose of the Study:

  • To review the effects of ionizing radiation and its damage mechanisms.
  • To outline the role, efficacy, and mechanisms of tocols as radioprotectors.
  • To compare tocols with amifostine, a known chemical radioprotector.

Main Methods:

  • Literature review on ionizing radiation effects and damage mediators.
  • Analysis of tocols' proposed mechanisms of action as radioprotectors.
  • Comparative assessment of tocols and amifostine efficacy and mechanisms.

Main Results:

  • Tocols, including tocopherols and tocotrienols, demonstrate potential as radioprotectors.
  • While antioxidant activity is a known mechanism, alternative pathways for tocol radioprotection are proposed.
  • Comparison with amifostine highlights distinct and potentially overlapping modes of action.

Conclusions:

  • Tocols represent a promising class of compounds for developing radiation countermeasures.
  • Further research into the multifaceted mechanisms of tocols is warranted.
  • Understanding these mechanisms can guide the development of effective strategies against radiation injury.