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Related Concept Videos

Interference and Diffraction02:18

Interference and Diffraction

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Interference is a characteristic phenomenon exhibited by waves. When two electromagnetic waves interact with their peaks and troughs coinciding, a resulting wave with enhanced amplitude is produced. This is known as constructive interference. In this case, the two waves interacting are in phase with each other.
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RNA interference (RNAi) is a process in which a small non-coding RNA molecule blocks the post-transcriptional expression of a gene by binding to its messenger RNA (mRNA) and preventing the protein from being translated.
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Interference and Decay01:16

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Forgetting is a complex cognitive phenomenon influenced by several factors, among which interference and decay are particularly prominent. These processes explain why individuals often struggle to retrieve specific information from memory, leading to lapses in recall that can be observed in everyday situations.
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In the CNS, neurogenesis, the birth of new neurons from stem cells, is limited to the hippocampus in adults. In other regions of the brain and spinal cord, neurogenesis is almost non-existent due to inhibitory influences from neuroglia, especially oligodendrocytes, and the absence of growth-stimulating cues. The myelin produced by oligodendrocytes in the CNS inhibits neuronal regeneration. Furthermore, astrocytes proliferate rapidly after neuronal damage, forming scar tissue that physically...
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Interference: Path Lengths01:10

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Consider two sources of sound, that may or may not be in phase, emitting waves at a single frequency, and consider the frequencies to be the same.
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When two waves of the same nature occur in the same region simultaneously, they result in interference. Interference of waves implies that the net effect of the waves is the sum of the individual waves' effects. However, it does not imply that the individual waves affect the propagation of other waves.
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Related Experiment Video

Updated: Jan 20, 2026

Neurogenesis Using P19 Embryonal Carcinoma Cells
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Old T Cells Interfer(on) with Neurogenesis.

Justin Rustenhoven1, Jasmin Herz1, Jonathan Kipnis1

  • 1Center for Brain Immunology and Glia (BIG), University of Virginia, Charlottesville, VA 22908, USA; Department of Neuroscience, School of Medicine, University of Virginia, Charlottesville, VA 22908, USA.

Trends in Immunology
|August 20, 2019
PubMed
Summary

Aging impairs adult neurogenesis, a key brain function. Recent findings show T cells in the aged brain disrupt this process via IFNγ signaling, suggesting T cells as therapeutic targets for brain aging.

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Area of Science:

  • Neuroscience
  • Immunology
  • Aging Research

Background:

  • Adult neurogenesis is crucial for brain function and declines with age.
  • Immune cells, specifically T cells, have been observed in brain regions associated with neurogenesis.

Purpose of the Study:

  • To investigate the role of T cells in age-related decline of adult neurogenesis.
  • To elucidate the mechanisms by which T cells impact neurogenesis in the aged brain.

Main Methods:

  • Analysis of T cell infiltration in neurogenic niches of aged brains.
  • Assessment of the impact of T cell signaling, particularly Interferon-gamma (IFNγ), on neurogenesis.

Main Results:

  • Clonal expansion of T cells was identified within the neurogenic niches of aged brains.
  • IFNγ signaling mediated by these T cells was found to impair adult neurogenesis.

Conclusions:

  • T cells contribute significantly to age-related dysfunction in adult neurogenesis.
  • Targeting T cells and their signaling pathways may offer a therapeutic strategy for age-related brain disorders.