Recently, the reporter learned from the Wuhan virus of the Chinese Academy of Sciences that the Shi Zhengli and Cui Jie team found a population of Rhinolophus bats in a cave in Yunnan Province. After 5 years of SARS-like coronavirus surveillance, they were among the virus strains contained in their bodies. , found the entire genomic component of the SARS virus that has spread to humans.
At the end of 2002, there were many cases of pneumonia in Guangdong Province, namely severe acute respiratory syndrome (SARS). In 2003, SARS spread and infected thousands of people around the world. Scientists identified the culprit as a coronavirus and found a genetically similar virus in the civet sold in the Guangdong livestock market. Subsequent investigations revealed that a large number of SARS-associated coronaviruses were transmitted in Chinese cephalopods, suggesting that the deadly strains may have originated from these bats and then spread to humans through civet cats.
Bats are natural reservoirs for SARS-like coronaviruses, but questions about how SARS evolved in bats and where bat populations emerged have not been answered. Since 2005, a number of research teams have found more and more SARS-like coronaviruses in various ichthyosaurs in China and Europe. However, in the key genes, these bat-type viruses and human-type viruses are significantly different, and they are not the direct ancestors of the SARS coronavirus that caused the 2002-2003 epidemic.
Shi Zhengli and Cui Jie's group have conducted long-term monitoring of the population of Rhododendron bats in a cave in Yunnan Province since 2011. It is found that all the genome components of the SARS virus transmitted to humans can be found in the natural gene pool of this SARS-like coronavirus. Found, and experts found evidence of frequent recombination at multiple sites within these SARS-like coronavirus genes, and speculated that the direct ancestors of SARS coronavirus might pass a series of recombinations between the ancestral strains of these SARS-like coronaviruses. produce.
This study provides new insights into the origin and evolution of SARS coronavirus, and reveals that SARS-like coronaviruses in Chinese bats carrying different strains have the potential to spread across the population, indicating that there are still new coron-like crowns similar to SARS in China. The risk of viral outbreaks provides an important basis for the prevention of related diseases. Professor Yuan Guoyong, a microbiologist at the University of Hong Kong, commented: "This discovery warns us that we need to reduce the infestation of wildlife habitats such as bats and eliminate wild animal market transactions, which is essential to prevent the occurrence of infectious diseases." (Technology Daily)
How should I eat maize every day? We need to control the amount of corn, according to the dietary guidelines, the amount of staple food we use in our lives should be controlled at 250 grams to 400 grams, and the ratio of coarse to fine grains is one to three or one to four, which simply means that about 130 grams of corn can be used every day, in addition to the appropriate reduction in the intake of staple food, let's say half a bowl of rice or a steamed bun, so as to avoid excessive calorie intake in our bodies.
It is also important to note that when eating corn, it is advisable to eat the whole cob together to better control our blood sugar. If corn is processed into corn juice or cornmeal food, the nutrients inside are often lost and what remains is basically sugar, which is often higher on the glycemic index and more likely to lead to a rise in blood sugar, for example, the glycemic index of ordinary corn is only 55, but with foods such as cornmeal, the glycemic index often reaches 68, so it is important to eat the right corn.
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