Just moving my mind, how can I get tired of this?| One week technology

Welcome to technology for a week. This week you will see: ① why the brain is fatigue; ② automatic repair of car paint; ③ spiders will also "dream"; ④ synthesize embryo; ⑤ high -speed warming of the Arctic.

Fatigue brain

High -intensity brain activity will make people feel tired, make people's attention, and easier to turn to relax and short -term profit choices (such as lying on their mobile phones). Sitting obviously, why can it be exhausted? A new study believes that this is related to changes in chemicals in the brain [1].

Like physical activity, brain labor can also make people fatigue -but the reason behind this is still unclear | Tuwa Creative

Through the analysis of magnetic resonance spectrum, the researchers monitored the metabolic situation in the brain of the two groups -one of them had to conduct a cognitive test of high difficulty for several hours, and the other had only easy brain activity. The results showed that after high -intensity brain force activity, the phenomenon of glutamic acid accumulated in the area where people are responsible for cognitive control (outer frontal leaf cortex) appear. Cologine is an important neurotransmitter, but it may be harmful to neurological function. Researchers speculate that people feel tired after thinking, perhaps because the brain needs to rest to restore the balance of glutamic acid concentration. However, the current research is not enough to give very solid evidence.

To be sure, people need to pay special attention to rest and sleep when they overcome the problems. Also remember: Don't make important decisions in mental fatigue.

Automatic repair

South Korean researchers have developed a car paint protection coating that can self -repair: only need to dry the sun, and the scratches on it will automatically disappear, and no longer need to be sent to the repair plant for repair [2].

You can repair the car paint scratch in the sun | Korea Research Institute of Chemical Technology

Researchers transformed the conventional resin coating materials, added reversible "dynamic chemical keys" to polymer molecules, and also added another ingredients that can absorb infrared light and produce heat. Under the sun, this new coating can absorb near -infrared light to heat itself. In temperature changes, the "dynamic chemical keys" in the polymer network gradually dissolve, and then reorganize, so that scratch damage is repaired.

After 30 minutes of sun exposure or focusing on the sun, the scratches on the surface of the model car completely disappear | Korea Research Institute of Chemical Technology

Under the exposure of noon sunlight, this coating material can repair the scratches by themselves in only 30 minutes. And if you focus on the sunlight with the zoom mirror, the repair process can be shortened to 30 seconds.

Spider "dreams"

Biologists observed the state of fast -moving eye sleep on the jumping spider -this prompt, they may also dream [3].

The spider in the sleeping dream can observe the movement of the eye | Daniela C. RößLER

During the human sleep cycle, fast eye movement and non -fast eye movement occur alternately; during the rapid eye movement period, the eyeball moves rapidly, and the muscles are relaxed. Most of the dreams that can be remembered also occur at this stage. Using the characteristics of a semi -transparent use of spider jumping spider, the researchers took 34 young jumping spiders and observed the sleep state similar to the rapid eye movement -at some stages, eye movement and legs curled up in the spider jumping spider. , And occasionally twitching on the legs and abdomen (the latter two indicate that the muscles are in a state of relaxation). Leg curls always appear with eye movement, and there are no these phenomena during other sleep stages. Researchers are very excited and guess that jumping spider may also dream, although current experimental observations are not enough to prove this. However, this is the first time that he has observed fast eyes to sleep on landless vertebrates, which allows us to have more understanding of sleep and brain.

Evarcha Arcuata ｜ Daniela C. Rößler used in the experiment

Synthetic embryo

No sperm, eggs and uterus are required, scientists have created mice embryos that fully "laboratory synthesis". In the in vitro cultivation device, these "synthetic embryos" grew smoothly for 8 days and grew a beating heart.

Mouse "synthetic embryo" growing in the cultivation device | Weizmann Institute of Science

This "synthetic embryo" is completely converted from artificially cultivated mice embryo stem cells and needs to be cultivated in a special rotation device. The glass tube carrying the embryo and the culture liquid continuously rotates in the instrument, so the placental blood flow provides nutrition to the embryo. The "synthetic embryo" successfully developed an important structure such as the heart, the brain, and the neural tube, and the similarity of the embryo form of the mouse that was naturally fertilized was as high as 95%. At present, the success rate of this training method is still very low, about 0.5%.

Rotating training device | Jacob Hannna Lab/Weizman Institute

These "synthetic embryos" are currently not growing into complete individuals. Their recent application prospects are used as experimental materials for related basic research.

High -speed warming

The Arctic is rapidly warming at a speed beyond the expected speed of scientists: a new study shows that the temperature rising here has reached nearly 4 times the global average [5].

Greenland Nuk | Hada Ajosenpää/Finnish Meteorology Institute Finnish researchers analyzed the meteorological data between 1979-2021. The results showed that in the past forty years, the Arctic Circle was warmed at a rate of 0.75 ° C every ten years, and the global worldwide was warmed at a speed of 0.75 ° C.The average warming speed is about 0.19 ° C every ten years.In some parts of the North Pole, the warming speed is even more amazing: in the Eurasia part of the Arctic Ocean, the area near the Swarba Islands and the New Di Island, the heating speed has even reached 1.25 ° C every ten years.Although people have known that the polar warming speed is faster than other areas in the past, the existing climate prediction model generally underestimates this effect.

references

[1] https://www.cell.com/current-biology/FullText/s0960-9822 (2)01111-3

[2] https://pubs.acs.org/doi/1021/acsapm.1c01768

[3] https://www.pnas.org/doi/full/10.1073/pnas.2204754119

[4] https://www.cell.com/cell/fulltext/s0092-8674 (22) 00981-3

[5] https://www.nature.com/articleS/S43247-022-00498-3

Author: Mai Mai, the window knocks on the rain

Edit: Window knocking rain

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