【Network rumor crusher】Can Omi Kerong escape the new crown test? Not so easy

　The Recent Global "Covid-19 Storm" variant strain of the Aumechjong mutation is rumored to have an "invisible variant" that can evade the COVID-19 test and cannot be detected by infected people. Is Omikron really so cunning? The latest issue of the Science Rumors List was released, which will exhaust the 5 health pseudo-knowledge that have recently been popular. In addition, shrimp and fruit eating together will produce arsenic? Hot water for nuclear heating with radiation? Myopia will not get presbyopia when it gets old? Have you been tricked by these rumors?

　　The monthly "science" rumor list is guided by the Beijing Municipal Association for Science and Technology, the Cyberspace Administration of the Beijing Municipal Party Committee, and the Capital Internet Association, and is jointly released by the Beijing Science and Technology Journalists and Editors Association and the Beijing Regional Websites Joint Rumor Dispelling Platform.

　　gossip

　　Masks can leave carcinogens

　　You need to shake it before using it

　　There is a saying circulating on the Internet: mask disinfection residue "ethylene oxide" is a class of carcinogens, after opening the package, the mask should be thrown in the air, so that the value of ethylene oxide drops significantly, otherwise it will cause cancer. Is this really the case?

　　Truth: Ethylene oxide is an organic compound, it is indeed a toxic carcinogen, can be used to make fungicides, is widely used in washing, pharmaceutical, printing and dyeing and other industries. Most of the medical surgical masks and N95 masks that can be purchased on the market are sterilized by ethylene oxide disinfection steam fumigation.

　　However, mask manufacturers will wait for ethylene oxide to evaporate after disinfection before packaging. In addition, residual ethylene oxide will be tested, and the mask must meet the national standard, that is, less than 10 μg/g to leave the factory.

　　A mask, from the packaging, to ethylene oxide sterilization, and then in the factory after the analysis time, and then out of the factory, storage, transportation, sales, until to the hands of consumers, at least to experience a month of time, and ethylene oxide itself is volatile, the factory has met the national standards, coupled with such a long period of volatilization, there is a residual and harmful health possibility, is really "minimal."

　　The random sampling of mask samples has an ethylene oxide residue below the national standard, which does not pose a threat to the wearer's health. When buying masks, you must choose products produced by regular enterprises, and the residues meet national standards and will not pose a threat to the health of the wearer.

　　Shrimp and fruit are eaten together to produce arsenic

　　The reason why "shrimp and fruit will produce arsenic" is that after shrimp and fruit are eaten at the same time, the arsenic pentoxide contained in shrimp will react chemically with the rich vitamin C in many fruits in the body to generate arsenic trioxide, that is, "arsenic", which may be fatal.

　　Truth: Can eating these two foods at the same time really be so toxic? Actually, no.

　　Through a large number of experiments, scientists have found that there is not much arsenic in seafood such as shrimp and crabs, and the content of arsenic pentoxide in each kilogram of shrimp does not exceed 0.5mg. The dose of arsenic cream (arsenic trioxide) that causes poisoning is 50 mg. According to the conversion coefficient calculation, if the shrimp contains arsenic up to a maximum limit of 0.5 mg/kg and there is enough vitamin C to react with it, a person needs to eat at least 40 kg of shrimp to reach the poisoning dose.

　　Imagine how a person's stomach can hold 40 kilograms of shrimp in one go, plus enough fruit? In fact, there is no such thing as "food phase" in both TCM theory and modern medical theory.

　　Omikron will be "invisible" and the new crown cannot be found

　　Truth: The World Health Organization confirmed at the end of November 2021 that the PCR test, the gold standard for confirming the new crown, can detect the Opichron variant.

　　PCR testing is generally to measure the two and three gene sequences of the new crown virus, and a mutation in the S protein of Omi Kerong- amino acid loss at position 69-70, will cause the S gene to be undetectable during the PCR test, but the other two gene fragments are positive. Then this result is still positive, and people infected with Omicron can still be detected. Not only that, but through the characteristics of the deletion of the S gene, it is also possible to quickly detect how many of these positive cases are Omikerong variants.

　　The Case of Omi kerong in South Africa is also mainly inferred by the deletion of the S gene.

　　Recently, British scientists have found that there are actually two branches of Omikeron, one branch does not have the amino acid loss of position 69-70, which is jokingly called "invisible" Omikeron. But no matter which branch, it will not evade PCR detection, but there is a difference in whether it can be determined whether the virus is Omi kerong through PCR detection.

　　Hot water for nuclear heating carries radiation

　　Recently, there have been rumors that the hot water of nuclear heating carries radiation, and if the heating pipe leaks, the consequences are unimaginable. Is there really such an evil thing?

　　Truth: The heat generated by the nuclear reaction first enters the homes of residents after being converted by layers of media, so there is no radiation in the heating pipes.

　　Like thermal power plants, nuclear power plants can also achieve "cogeneration", that is, to generate electricity and heat supply. The heat generated by the nuclear power plant will be "multi-stage heat exchange" through the heat exchange station in the factory and the heat exchange station of the heat exchange enterprise outside the plant, and finally the heat will be transferred to the end user through the municipal heating pipe network.

　　In the whole process, there are only two modes of "steam heating water" and "water heating water", and there are multiple circuits between the nuclear power plant and the heating user, and only heat is transferred between each circuit. Without the exchange of water, there would be no radioactive material entering the user's heating pipes.

　　Myopia will not get presbyopia when you are old

　　Myopia is not clear from a distance, presbyopia is not clear from close range, so myopia will not get presbyopia when you are old. Does this logic really hold?

　　Truth: Myopia is mostly genetic factors or long-term poor eye habits lead to weakened refractive action of the cornea and lens, which in turn focuses parallel rays in front of the retina, making people look at distant objects clearly.

　　Presbyopia, on the other hand, is due to age, the lens gradually hardens, the elasticity weakens, and the contractile function of the ciliary muscle decreases, which in turn impairs the visual adjustment function and makes it difficult for people to see clearly when looking at near objects.

　　Presbyopia is not a disease, but a natural decline in the ability of the human eye to regulate, which is a normal functional degradation. Presbyopia usually occurs slowly, starting around the age of 45 and generally reaching the age of 65 to 70 years with a stable degree. This is a condition of aging of the body and is irresistible.

　　Therefore, there is an essential difference between myopia and presbyopia from a pathological point of view, myopia is caused by refractive errors, while presbyopia is caused by the degradation of the lens and loss of elasticity. People who originally had myopia, and after old age, there are old flowers, they will face the problem of "looking at the distance and seeing the near and the near are not clear", then it is necessary to prepare two pairs of glasses with different degrees or choose to wear progressive multifocal glasses.

Source: Internet Joint Rumor Dispelling Platform