The defensive posture is right, and the smog is not afraid.
Release date: 2016-11-07 Spring is coming to autumn, and the season of smog and hegemony has arrived: The haze is mainly composed of PM2.5 in the air. In addition to causing direct damage to the respiratory system, a study in the United States has shown that long-term exposure to air containing high concentrations of PM2.5 can also cause brain capacity loss, resulting in structural damage to the brain [1]. Other studies have shown that high concentrations of PM2.5 can damage young people's blood vessels, and are more likely to cause high blood pressure, heart disease or stroke [2]. Other studies have shown that in areas where PM2.5 levels in the air are higher than 70 μg/m3, for every 10 μg/m3 increase in PM2.5, the risk of membranous nephropathy increases by 14% [3]... So terrible! Must take a level 1 defense! First of all, you must have thought of it, the most important thing is to go out with a mask. However, there are a wide variety of masks on the market, and we don't know which one is good, so let's first analyze what kind of masks should be chosen for the haze. Common in the market Ordinary skim gauze mask, Disposable medical mask, Generally use cotton masks, etc. Not suitable for preventing PM2.5, A mask suitable for PM2.5 protection requires the following training: 1. High efficiency for PM2.5 particles filtration; 2. It is close to the face when worn, and it does not leak; 3. Respiratory resistance is small. So how do we know if a mask meets the above three? The following Gu Jun came to analyze with you one by one. First of all, the masks that meet the N95 standard can satisfy the first one. The N95 mask is one of nine anti-particulate masks certified by the NIOSH (National Institute for Occupational Safety and Health). "N" means particles that are not suitable for oiliness; "95" means that the filtration efficiency reaches 95% under the test conditions specified by the NIOSH standard. That is, the N95 mask is tested with 0.3 micron sodium chloride particles, and the blocking rate must be over 95%. Particles with a diameter of 0.3 microns can be blocked, and the diameter of 2.5 microns is no problem. China also has a national standard similar to N95 GB2626-2006 KN95, a mask that meets this standard can also effectively filter PM2.5 particles. It is not difficult to buy a mask that meets these two standards. Even some brands of masks have a filtration efficiency that greatly exceeds the above criteria. Then we look at the second article. The leak rate is an important indicator for evaluating the performance of an anti-particle mask. If a mask does not fit snugly on the face, then the filtration efficiency is no longer useful. Stereo-cut masks generally have better sealing performance because they better fit the facial curve. Most of the masks are mainly sealed by a shaped nose clip, and are also sealed by sealing the fin edges and sealing the pre-shaped nose bridge clips. Some masks have better sealing performance at rest, but they are easy to leak when talking, exercising, etc., so the elasticity of the material is very important. Everyone's face is not the same, so it's not a good idea to say what shape mask is best. I hope everyone can find a mask that suits their face. Of course, in general, the person with a bigger face is less likely to wear a mask. . Ok. . . Finally, let's look at the index of respiratory resistance. Masks that comply with the PM2.5-compliant standard are generally less breathable, so some design is needed to reduce breathing difficulty. The most common design is the breathing valve. The working principle of the breathing valve is that the positive pressure of the exhaust gas during exhalation blows the valve plate to quickly remove the exhaust gas in the body, reducing the sultry feeling when using the mask, and the negative pressure during inhalation automatically closes the valve to avoid Inhale pollutants from the outside environment. In addition, some masks are skeleton-shaped, which can support the mask to form a large inner space of the mask. The mask does not bulge or flatten with the breathing, so that the breathing buffer is greatly increased and the breathing is more comfortable. It should be noted that after the mask is removed, it must be folded and stored after drying, in order to prevent the moisture from breathing to allow the mask to breed bacteria. In addition, the time of wearing should not be too long, the elderly and people with cardiovascular disease should avoid wearing, so as not to cause dizziness caused by breathing difficulties. The life of an anti-PM2.5 mask is generally tens of hours or days. Remember to replace it in time, otherwise the effect will be discounted. It’s hard to get indoors, and finally I can take off my mask. However, I still don’t dare to open the window, otherwise the smog will come in again! At this time, an air purifier is required to appear. How to choose an air purifier? First of all: focus on the purification method of the purifier. There are two common purification methods: 1. Filter adsorption. The characteristics of this type of technology are that the function of the fan and the quality of the filter determine the purification effect. The placement of the machine and the layout of the interior affect the purification. The indoor purification effect is not balanced, and it is difficult to complete. The filter replacement cost is high. 2. Active adsorption of negative ions. The method uses ecological negative ion generation chip technology to generate ecological-grade negative ions, and releases negative ions into indoor air, adsorbs dust and pollution particles in the air, and integrates into larger particles to settle on the surface of the ground and objects, thereby achieving freshness. The purpose of indoor air. Then: focus on the efficiency of the purifier Many people feel that their purchase of anti-fog air purifiers has no effect. In fact, it may be that the efficiency of the selected purifier is too small compared to the indoor area. In the new round of international standards for air purifiers, the actual CADR values ​​of standard air purifiers are clearly required. The CADR value is the ratio of the air purifier output clean air obtained by the American Association of Home Appliance Manufacturers (AHAM) according to strict test standards. The higher the CADR value, the higher the purification efficiency of the purifier. Finally: it depends on the noise value is not big In general, the noise in normal environments is 40-70 dB. Noise, everyone is not willing to hear, especially in the bedroom. If you generate 60-70 decibels of noise, you will feel a serious impact on your life. Therefore, it is best to choose a noise-free or low-noise anti-fog air purifier. It should be noted that when using the air purifier, it is necessary to close the doors and windows, otherwise the effect will also drop. Just like the application problem of the fans when you were young, the pool will be filled with water and the water will never be able to finish. Source: Bio Valley
Proteins are large biomolecules, or macromolecules, consisting of one or more long chains of amino acid residues. Proteins perform a vast array of functions within living organisms, including DNA replication, catalyzing metabolic reactions, responding to stimuli, and transporting molecules from one location to another.
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