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Related Concept Videos

Photoreceptors and Visual Pathways01:22

Photoreceptors and Visual Pathways

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At the molecular level, visual signals trigger transformations in photopigment molecules, resulting in changes in the photoreceptor cell's membrane potential. The photon's energy level is denoted by its wavelength, with each specific wavelength of visible light associated with a distinct color. The spectral range of visible light, classified as electromagnetic radiation, spans from 380 to 720 nm. Electromagnetic radiation wavelengths exceeding 720 nm fall under the infrared category,...
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Color perception begins in the retina, the light-sensitive layer at the back of the eye. Two main theories explain how colors are seen: the trichromatic theory and the opponent-process theory. The trichromatic theory, proposed by Thomas Young in 1802 and extended by Hermann von Helmholtz in 1852, suggests that color vision is based on three types of cone receptors in the retina. These cones are sensitive to different but overlapping ranges of wavelengths corresponding to red, blue, and green.
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Light plays a significant role in regulating the growth and development of plants. In addition to providing energy for photosynthesis, light provides other important cues to regulate a range of developmental and physiological responses in plants.
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Reporter genes are a type of protein-coding gene that are often tagged to a gene of interest. Once inside a target cell, reporter genes usually produce visually identifiable characteristics like fluorescence and luminescence when expressed along with the gene of interest. Thus, reporter genes “report” the presence or absence of genes of interest in an organism, determine the gene expression pattern, or track the physical location of a DNA segment or protein in the cell.
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Most organisms use photoreceptors to sense and respond to light. Examples of photoreceptors include bacteriorhodopsins and bacteriophytochromes in some bacteria, phytochromes in plants, and rhodopsins in the photoreceptor cells of the vertebral retina. The light-sensitive property of these receptors is because of the bound chromophores, such as bilin in the phytochromes and retinal in the rhodopsins.
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Updated: Nov 23, 2025

Optimizing Photoneuromodulation Techniques to Evaluate the Role of Green Light-Emitting Diodes in Pain Management
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Turning up the Green Light.

Julien Cassereau1, Vincent Courdavault2, U Valentin Nägerl3

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Researchers engineered a new fluorescent protein (FP) variant with improved brightness and stability using

Keywords:
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Area of Science:

  • Biochemistry and Molecular Biology
  • Cell Biology
  • Bioimaging

Background:

  • Fluorescent proteins (FPs) are essential tools for visualizing cellular processes.
  • Existing FP variants have limitations in brightness and stability for advanced applications.

Purpose of the Study:

  • To engineer a novel variant of Green Fluorescent Protein (GFP) with enhanced properties.
  • To improve cellular labeling and biochemical sensing capabilities.

Main Methods:

  • Introduction of specific 'folding mutations' into the GFP sequence.
  • Characterization of the engineered variant's photophysical and stability properties.

Main Results:

  • The engineered GFP variant exhibited significantly enhanced cellular brightness.
  • The new variant demonstrated superior stability compared to existing FPs.
  • Facilitated advanced cellular bioimaging in neuroscience.

Conclusions:

  • The engineered GFP variant offers a valuable tool for demanding bioimaging.
  • This advancement expands the utility of fluorescent proteins in biological research.