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関連する概念動画

Vision01:24

Vision

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Vision is the result of light being detected and transduced into neural signals by the retina of the eye. This information is then further analyzed and interpreted by the brain. First, light enters the front of the eye and is focused by the cornea and lens onto the retina—a thin sheet of neural tissue lining the back of the eye. Because of refraction through the convex lens of the eye, images are projected onto the retina upside-down and reversed.
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Optimal Foraging00:48

Optimal Foraging

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How animals obtain and eat their food is called foraging behavior. Foraging can include searching for plants and hunting for prey and depends on the species and environment.
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Predator-Prey Interactions02:39

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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Anatomy of the Eyeball01:20

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The eye is a spherical, hollow structure composed of three tissue layers. The outer layer — the fibrous tunic, comprises the sclera — a white structure — and the cornea, which is transparent. The sclera encompasses some of the ocular surface, most of which is not visible. However, the 'white of the eye' is distinctively visible in humans compared to other species. The cornea, a clear covering at the front of the eye, enables light penetration. The eye's middle...
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Photoreceptors and Visual Pathways01:22

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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 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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A Caenorhabditis elegans Nutritional-status Based Copper Aversion Assay
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C について エレガンスは色を区別して,餌を探します.

D Dipon Ghosh1,2, Dongyeop Lee2, Xin Jin3

  • 1Department of Cellular and Molecular Physiology, Yale University, New Haven, CT, USA. dipon@mit.edu michael.nitabach@yale.edu.

Science (New York, N.Y.)
|March 6, 2021
PubMed
まとめ

虫は目やオプシンなしで 色を見ることができ 毒素を避けるために 光の比率を利用します この発見により 単純な生物のスペクトル差別の新しいメカニズムが明らかになりました

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科学分野:

  • * 感覚生物学
  • * 動物 の 行動
  • * 遺伝学

背景:

  • * 色の検出は 動物の航海と生存に不可欠です.
  • * 進化的に保存されたオプシン光受容体遺伝子に依存すると伝統的に考えられている.
  • * オプシンとは,光受容体細胞に存在する光感受性タンパク質です.

研究 の 目的:

  • * カエノラビティス・エレガンス (丸虫) の色分け能力を調査する.
  • * オプシン独立色検出の基礎となるメカニズムを決定する.
  • * 野生の丸虫株における色差の生態学的関連性を調査する.

主な方法:

  • * 光刺激と毒素への反応として餌を採る決断を観察する行動分析
  • * 遺伝子分析により,色に依存した採食に関与する遺伝子を特定する.
  • 異なる野生のC. elegans株を比較した研究

主要な成果:

  • * *C. elegans*は色を区別することができ,特に青と色の光の比率を使用して,青色の色素毒素を避けることができます.
  • * この色に依存した採食は,目やオプシンとは独立して発生します.
  • * 野生の株の間で色分け能力の有意な差異が存在し,生態学的重要性を強調しています.

結論:

  • * 細胞のストレス反応経路によって,オプシンに独立した色検知が可能である.
  • * 細胞のストレス反応遺伝子は,C. elegansのスペクトル差別のために必要である.
  • * これらの発見は,オプシンが欠けている生物でも,スペクトル差別メカニズムがこれまで考えられていたよりも広く,多様である可能性があることを示唆しています.