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Related Concept Videos

Photoreceptors and Visual Pathways01:22

Photoreceptors and Visual Pathways

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, whereas...
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Light as Energy

The energy required to carry out photosynthesis is light— typically electromagnetic radiation from the sun. The range of all possible wavelengths is known as the electromagnetic spectrum.
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A photon is a discrete electromagnetic particle or bundle of energy. Photons are characterized by their frequency, wavelength, and amplitude, similar to the properties of a wave. Waves with higher frequencies transmit more energy and have shorter wavelengths than longer wavelengths that transmit less...
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Photoluminescence: Fluorescence and Phosphorescence

Photoluminescence is a process where a molecule absorbs light energy and re-emits it in the form of light. This phenomenon occurs when a substance absorbs photons, promoting its electrons to higher energy level excited states, followed by a relaxation process in which the electrons return to their original ground state energy levels and emit light. Photoluminescence is widely observed in various materials, including semiconductors, and organic and inorganic compounds.
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An object absorbing an electromagnetic wave would experience a force in the direction of propagation of the wave. This force occurs because electromagnetic waves contain and transport momentum. The force accounts for the wave's radiation pressure exerted on the object. Maxwell's prediction was confirmed in 1903 by Nichols and Hull by precisely measuring radiation pressures with a torsion balance. The measuring instrument had mirrors suspended from a fiber kept inside a glass container. Nichols...
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Photoluminescence offers a wide range of applications due to its inherent sensitivity and selectivity. This technique allows for both direct and indirect analyses of the analyte. Direct quantitative analysis is possible when the analyte exhibits a favorable quantum yield for fluorescence or phosphorescence. However, an indirect analysis may be feasible if the analyte is not fluorescent or phosphorescent, or if the quantum yield is unfavorable. Indirect methods include reacting the analyte with...
Photoreceptors and Plant Responses to Light02:00

Photoreceptors and Plant Responses to Light

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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Scattering And Absorption of Light in Planetary Regoliths
11:34

Scattering And Absorption of Light in Planetary Regoliths

Published on: July 1, 2019

Light signaling: back to space.

Jordi Bou-Torrent1, Irma Roig-Villanova, Jaime F Martínez-García

  • 1Departament de Genètica Molecular IBMB, Laboratori de Genètica Molecular Vegetal, Consorci CSIC-IRTA, c. Jordi Girona, 18-26, 08034 Barcelona, Spain.

Trends in Plant Science
|February 19, 2008
PubMed
Summary
This summary is machine-generated.

Plant photoreceptor research has advanced, but long-distance light signaling remains unclear. This study explores intercellular and inter-organ communication in plant photomorphogenesis, offering new perspectives for future mutant screening.

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Last Updated: Jul 7, 2026

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Area of Science:

  • Plant biology
  • Photomorphogenesis
  • Molecular signaling

Background:

  • Phytochrome photoreceptors are key to plant photomorphogenesis.
  • Long-distance communication in plant light responses is poorly understood.

Purpose of the Study:

  • To explore the role of intercellular and inter-organ communication in plant light signaling.
  • To integrate signaling beyond the cellular level with transcriptional networks.

Main Methods:

  • Review of existing and novel experimental data.
  • Analysis of light signaling pathways extending beyond the cell.

Main Results:

  • Identified gaps in understanding long-distance communication in photomorphogenesis.
  • Proposed a novel framework integrating cellular and systemic communication.

Conclusions:

  • Intercellular and inter-organ communication are critical for integrating light-regulated responses.
  • Re-evaluation of screening parameters for photomorphogenic mutants is suggested.