Can cats really see in the dark? Detailed answer

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Can cats really see in the dark? Detailed answer

Big encyclopedia for children and adults

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Can cats really see in the dark?

No animal can see in complete darkness, but cat eyes are much more adapted to very low light conditions than the eyes of most animals.

The fact is that on the inner surface of the choroid of the cat's eye there is a shiny layer (tapetum, or mirror). It reflects light onto the retina and thereby enhances the light irritation of the visual cells, increasing their sensitivity in low light.

The same shiny layer causes the cat's eyes to seem to glow in almost complete darkness.

Author: Kondrashov A.P.

Random interesting fact from the Great Encyclopedia:

Why are the Chinese not naturally adapted to drinking milk?

The human body digests milk thanks to a special enzyme - lactase, which was originally produced only in the body of infants in order to drink mother's milk. However, some people had a "defect" that allowed the enzyme to be produced in their intestines all their lives. It was the ability to drink milk that gave them a competitive advantage among northern Europeans who were deficient in calcium and vitamin D. Gradually, this gene spread, and today the number of inhabitants of northern European countries with lactose intolerance does not exceed 10%. And among the Chinese, residents of Southeast Asia, Africa, American Indians, this figure is above 90%.

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Quantum dot in gold 26.09.2009

Quantum dots are capable of fluorescence, that is, they glow when exposed to visible light. Gold nanoparticles glow when exposed to infrared light. Both types of these particles are used by biologists for diagnostics, and gold particles are also used for treatment, since when irradiated with microwaves, they heat the cell in which they find themselves.

Scientists from the University of Washington, led by Gao Xiaohu, came up with a technique that allows you to combine these particles into one. In accordance with it, a quantum dot is covered with a polymer layer, by changing the structure of which it is possible to set the shell thickness with an accuracy of one nanometer. Gold ions were deposited onto the polymer and a gold shell 2–3 nm thick was obtained.

From above everything was covered with polyhistidines. In the resulting particle with a diameter of 15–20 nm, the quantum dot regularly shone, and its light passed through a thin golden shell.

Since gold is not poisonous and is approved for use, many proteins can be attached to it, and the new system will be a good addition to existing nanomedicine tools.

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