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関連する概念動画

Vision01:24

Vision

59.6K
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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Color Vision01:24

Color Vision

1.4K
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.
1.4K
Depth Perception and Spatial Vision01:15

Depth Perception and Spatial Vision

1.9K
Depth perception is the ability to perceive objects three-dimensionally. It relies on two types of cues: binocular and monocular. Binocular cues depend on the combination of images from both eyes and how the eyes work together. Since the eyes are in slightly different positions, each eye captures a slightly different image. This disparity between images, known as binocular disparity, helps the brain interpret depth. When the brain compares these images, it determines the distance to an object.
1.9K
Reaction Mechanisms03:06

Reaction Mechanisms

30.6K
Chemical reactions often occur in a stepwise fashion, involving two or more distinct reactions taking place in a sequence. A balanced equation indicates the reacting species and the product species, but it reveals no details about how the reaction occurs at the molecular level. The reaction mechanism (or reaction path) provides details regarding the precise, step-by-step process by which a reaction occurs.
For instance, the decomposition of ozone appears to follow a mechanism with two steps:
30.6K
Mechanical Protein Functions01:58

Mechanical Protein Functions

5.5K
Proteins perform many mechanical functions in a cell. These proteins can be classified into two general categories- proteins that generate mechanical forces and proteins that are subjected to mechanical forces. Proteins providing mechanical support to the structure of the cell, such as keratin, are subjected to mechanical force, whereas proteins involved in cell movement and transport of molecules across cell membranes, such as an ion pump, are examples of generating mechanical force. 
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What is Gene Expression?01:42

What is Gene Expression?

195.3K
Overview
Gene expression is the process in which DNA directs the synthesis of functional products, that is, proteins. Cells can regulate gene expression at various stages. It allows organisms to generate different cell types and enables cells to adapt to internal and external factors.
Genetic Information Flows from DNA to RNA to Protein
A gene is a stretch of DNA that serves as the blueprint for functional RNAs and proteins. Since DNA is made up of nucleotides and proteins consist of amino...
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関連する実験動画

Updated: Jan 27, 2026

Author Spotlight: Unraveling Vitamin A Transport Mechanisms — Linking Liver Receptors to Vision Health Through RBPR2 and RBP4 Interactions
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オプシン・エクスペリション:色彩視力の調節のための新しいメカニズム

Christiana L Cheng1, Iñigo Novales Flamarique

  • 1Department of Biological Sciences, Simon Fraser University, Burnaby, British Columbia V5A 1S6, Canada.

Nature
|March 19, 2004
PubMed
まとめ
この要約は機械生成です。

太平洋のピンクサーモンのは,年齢とともに光の感受性 (スペクトル現象型) を変化させることができます. この光受容体の可塑性により,色彩視力が変化するライフスタイルに適応し,以前は不可能と考えられていた発見です.

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A Standardized Obstacle Course for Assessment of Visual Function in Ultra Low Vision and Artificial Vision
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A Standardized Obstacle Course for Assessment of Visual Function in Ultra Low Vision and Artificial Vision

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科学分野:

  • 網膜生理学 網膜の生理学
  • ビジョン科学 ビジョン科学
  • 動物の行動 動物の行動

背景:

  • 円型光受容体は,オプシンタンパク質によって決定される固定されたスペクトル現象型を持っています.
  • このスペクトル現象型は,一般的に動物の生涯を通じて静的であると仮定されます.

研究 の 目的:

  • コーンの光受容体におけるスペクトル現象型の可塑性を調査する.
  • 状光受容体が,動物の生涯にわたって光の感受性を変化させることができるかどうかを判断する.

主な方法:

  • 太平洋のピンクサーモン (Oncorhynchus gorbuscha) の単一のコンのスペクトル現象型を調べました.
  • コーン光受容体におけるオプシン生成の調節を分析した.
  • 魚の成長と年齢と相関するスペクトル現象型の変化.

主要な成果:

  • 太平洋のピンクサーモンの単一のコーンがスペクトル現象型を切り替えることが示された.
  • 紫外線から青の感度へのシフトが観察されました.
  • このスイッチは,規制されたオプシン生成によって媒介されていることが示されています.

結論:

  • 円型光受容体スペクトルのフェノタイプは静的ではなく,可塑性を示すことができる.
  • サーモンの光受容器の可塑性は,色覚を人生の段階の変化に適応させる可能性がある.
  • この発見は,光受容体スペクトルチューニングの固定性に関する以前の仮定に異議を唱える.