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Sauna for the heart

01.09.2004

Japanese doctors from the University of Kagoshima claim that staying in the sauna is beneficial for patients with chronic heart failure.

Twenty patients spent 15 minutes daily in a steam room at 60 degrees Celsius for two weeks, and then lay in bed under a thick blanket for 30 minutes to maintain a high body temperature. A control group of 10 patients simply lay in bed for 45 minutes without a blanket.

At the beginning of the experiment, the severity of symptoms of heart failure was approximately the same in both groups. But after two weeks, those who had been in the bath had significantly fewer cases of arrhythmias and the levels of two hormones in the blood decreased, the presence of which indicates damage to the heart muscle.

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Adsorbent instead of cold 10.11.2018

In today's world, we are surrounded on all sides by polymers. There are so many of them that polymer waste is a serious problem for the oceans - but here, as they say, they themselves are to blame. However, in addition to the problem of waste, there is another one.

The fact is that polymer production is a very costly process in terms of energy. For example, before a conventional bag can be made from polyethylene, the polyethylene itself must first be made from ethylene. And before that, get ethylene, because it is not found in nature. Ethylene is produced from other hydrocarbons using a process called pyrolysis: hydrocarbon raw materials are heated in special apparatus, as a result of which large molecules fall apart into smaller ones, among which there is ethylene. But in addition to the ethylene we need, many more different substances are formed that must somehow be removed from this mixture, because ethylene must be of a very high degree of purity in order to produce polyethylene.

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One possible solution to the problem is the use of adsorbents. Instead of cooling, compressing and heating millions of tons of a gas mixture, it would be nice to pass it through some kind of filter that adsorbs ethane and gives pure ethylene at the exit. Researchers have been struggling for years to create such materials. A few years ago, ethane and ethylene were separated using metal-organic frameworks (MOFs), but with one very significant "but". The developed adsorbent retained ethylene, but, on the contrary, let ethane through. That is, the separation occurred the other way around - not ethylene was cleaned from ethane, but ethane from ethylene. Taking into account the fact that in real conditions the mixture contains much more ethylene, extra work was obtained, which was no better than cryogenic separation.

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