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Related Concept Videos

Ultraviolet and Visible (UV–Vis) Spectroscopy: Overview01:02

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Ultraviolet–visible (UV–visible or UV–Vis) spectroscopy is an analytical technique that investigates the interaction between matter and UV–Vis light within the electromagnetic spectrum. This method is widely used for its versatility, simplicity, and relatively quick data acquisition, making it valuable for both qualitative and quantitative analysis. When UV–Vis radiation passes through a material,  molecules absorb light depending on the energy required for...
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UV–Vis Spectroscopy of Conjugated Systems01:32

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Organic compounds with conjugated double bonds show strong absorption features in the UV–visible region of the electromagnetic spectrum attributed to π → π* electronic excitations. Generally, a UV–vis absorption spectrum is recorded as a plot of absorbance vs wavelength. The wavelength of maximum absorbance, which manifests as a peak in the absorption spectrum, is denoted as λmax.
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Color Vision01:24

Color Vision

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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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UV–Vis Spectroscopy: Molecular Electronic Transitions01:16

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In Ultraviolet–Visible (UV–Vis) spectroscopy, the absorption of electromagnetic radiation is used to probe the electronic structure of molecules. This technique provides insights into molecular electronic transitions, particularly the movement of electrons between different molecular orbitals. Radiation is absorbed if the energy of the electromagnetic radiation passing through the molecule is precisely equal to the energy difference between the excited and ground states. During this...
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Predator-Prey Interactions

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Predators consume prey for energy. Predators that acquire prey and prey that avoid predation both increase their chances of survival and reproduction (i.e., fitness). Routine predator-prey interactions elicit mutual adaptations that improve predator offenses, such as claws, teeth, and speed, as well as prey defenses, including crypsis, aposematism, and mimicry. Thus, predator-prey interactions resemble an evolutionary arms race.
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Changes in Skin Color: Clinical Perspectives01:14

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The first thing a clinician sees is the skin, so the examination of the skin should be part of any thorough physical examination. Most skin disorders are relatively benign, but a few, including melanomas, can be fatal if untreated. A couple of the more noticeable disorders, albinism and vitiligo, affect the appearance of the skin and its accessory organs.
Albinism
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Related Experiment Video

Updated: May 4, 2026

Measuring Spatially- and Directionally-varying Light Scattering from Biological Material
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[Using spectra and visual modeling to study animal coloration].

Can-Chao Yang1, Wei Liang

  • 1Ministry of Education Key Laboratory for Tropical Plant and Animal Ecology, College of Life Sciences, Hainan Normal University, Haikou 571158, China. liangwei@hainnu.edu.cn.

Dong Wu Xue Yan Jiu = Zoological Research
|January 14, 2014
PubMed
Summary

Animal coloration is vital for communication and survival. This study introduces a fiber spectrophotometer method to objectively quantify animal colors, considering their unique tetrachromatic vision systems for accurate analysis.

Keywords:
Fiber spectrophotometerPericrocotus flammeusRobinson projectionTetrahedral color spaceUltravioletVisual modeling

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Area of Science:

  • Zoology and Optics: Investigates animal coloration, visual perception, and spectrophotometry.
  • Integrates principles of animal physiology, pigment biochemistry, and color science.

Context:

  • Animal coloration serves critical adaptive roles in mate choice, competition, and predator avoidance.
  • Significant differences exist between human (RGB) and animal (e.g., tetrachromatic) vision, impacting color perception.
  • Traditional human color classification can misrepresent animal coloration due to variations in visual systems.

Purpose:

  • To present a novel methodology using fiber spectrophotometry for precise quantification of animal coloration.
  • To analyze spectral data and employ visual modeling for objective color evaluation in animals.
  • To demonstrate the application of this method using the sexually dimorphic scarlet minivet (Pericrocotus flammeus).

Summary:

  • The study details a fiber spectrophotometer approach to quantify animal coloration by analyzing reflectance spectra.
  • Spectral data is processed for hue, chroma, and brightness, while visual modeling maps colors in a tetrahedral space, calculating color span and diversity.
  • This method incorporates ambient light and animal retinal sensitivity for an objective assessment of coloration from the animal's perspective.

Impact:

  • Provides a standardized, objective method for quantifying animal coloration, overcoming limitations of human-centric color assessment.
  • Enhances understanding of the role of coloration in animal communication, behavior, and evolution.
  • Facilitates more accurate comparative studies of visual signaling across diverse animal species.