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An easy way to check your heart

08.06.2010

Japanese doctors offer a simple test to check the condition of the cardiovascular system.

Sit on the floor with your legs extended and try to reach your toes. Experiments conducted on 526 volunteers aged 20 to 83 showed that the loss of body flexibility is accompanied by a loss of flexibility of the arteries, and this threatens with high blood pressure and possibly heart trouble.

The biological nature of this connection is not entirely clear, but the author of the study, Professor Kenta Yamamoto, emphasizes that the muscles and ligaments responsible for the flexibility of the body are made of the same materials as the walls of blood vessels. There is some experimental evidence that exercising flexibility can improve the condition of the arteries. But this study was not large enough and still needs to be confirmed.

However, American sports medicine specialist Thomas Anthony does not recommend this test for older people.

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The gel will extract water from the desert air 20.06.2023

MIT scientists have developed an innovative gel capable of extracting incredible amounts of water from the air, even in low humidity environments like deserts.

This hydrogel, created by researchers, has the unique ability to instantly absorb moisture from the air, even at a relative humidity of only 30%. The material effectively retains moisture, preventing it from leaking, and allows it to condense and be collected for use.

The synthesized material, which is a transparent and elastic gel, is made from hydrogel, which is already used in products such as disposable diapers due to its ability to absorb moisture. However, the researchers improved this ability by adding lithium chloride, a powerful desiccant.

In early experiments, scientists soaked hydrogels in salt water and waited for them to soak up the salt. However, the process was very slow and most experiments took 24 to 48 hours. To improve the performance of the material, the engineers modified this technology to increase its ability to absorb salt and water.

The researchers used standard methods to synthesize hydrogel tubes from polyacrylamide, then cut them into thin disks and dipped them in a lithium chloride solution with varying salt concentrations. Every day, they removed the disks from the solution, weighed and measured the amount of salt that had penetrated, and then returned them back to the solution.

The results showed that the hydrogels absorbed more and more salt over time. After 30 days of soaking, the hydrogels incorporated up to 24 g of salt, which is a record compared to previous results, where only 1 g of salt per 6 g of polymer. Absorptive capacity tests have shown that such a material under conditions of relative humidity of 30% is able to absorb up to 1,79 g of water per 1 g of material, which corresponds to dry desert air.

The next stage of the research will be the study of kinetics and the development of ways to accelerate the process of water absorption by the material. This will greatly increase the efficiency of material recycling, allowing you to collect water several times a day, instead of a single collection. According to study co-author Gustav Graeber, this discovery provides potential opportunities for more efficient use of water resources in dry regions and will overcome problems with access to drinking water in desert areas.

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