Why did human pregnancy test lead to the extinction of frogs? Do you know the evolutionary history of these pregnancy tests?

> > Can you believe it? In order to test for pregnancy, humans have invented all kinds of wonderful methods, and even almost caused the extinction of frogs. What is going on? Are human pregnancy tests still related to frogs? >

A long time ago, medical technology was not developed, and people tried their best to detect whether they were pregnant, but the real purpose of pregnancy test had to start from ancient Egypt 3,500 years ago. In records at that time, women If you want to know whether you are pregnant or not, you will put the seeds of barley and wheat in a bag with urine at the same time. If the seeds germinate, it proves that you are pregnant. If the barley germinates, you are carrying a boy. The pregnancy is a girl. This method seems a little confusing, but later scientists confirmed that the accuracy rate of the seed pregnancy test has reached 70%.

In comparison, the breath pregnancy test invented by the ancient Greeks seems a bit outrageous and absurd. To verify whether you are pregnant, you need to stuff an onion into a woman's body. If the next morning, the woman has a very serious breath, It proves that you are not pregnant, but this method has not been recognized by modern medicine. Until the Middle Ages, Europeans came up with another trick, that is, the urine observation method. According to written records, the urine of pregnant women is clear and grayish white. Know if you have noticed that most of the methods of pregnancy test are based on urine, but what does this have to do with the extinction of frogs? Let's look down.

Can you imagine it? Human pregnancy tests are actually inseparable from urine, and the connection between urine and pregnancy tests did not gradually surface until the 1920s. What role did frogs play during this period? In 1927, when scientists detected the urine of pregnant women, they discovered hCG, the full name of which is human chorionic gonadotropin. A valid pregnancy test.

So two scientists started related experiments. At first, they injected the urine of a suspected pregnant woman into a juvenile novice mouse, and then dissected the ovary to observe the condition of the ovary. Precocious puberty proved that the woman was pregnant. In order to ensure accuracy It takes 5 novice mice for each test, and the cycle is 4 days. Later, scientists will hit the idea on the novice rabbit. Fortunately, the detection period is shortened to 36 hours, but the cost of the novice rabbit is too high. In 1930, there was a A scientist inadvertently discovered that frogs can be used for pregnancy tests at low cost and without killing. As a result, the African clawed frog, which is large in number and easy to catch, has become a pregnancy test animal instead of a novice rabbit, and will be suspected of being pregnant. Female urine was injected into frogs.

If the female frog lays eggs, it proves that the female is pregnant, and the detection cycle only takes 6-12 hours. It is worth mentioning that the African clawed frog can be recycled, and the next round of detection can be carried out after a few days, and then artificially reared. Their lifespan can exceed 10 years, so the question is, since frogs can be recycled and live longer, why are they almost extinct? Let's look down.

do you know? Frogs have a very positive role in promoting the evolution of human pregnancy testing, but why did human pregnancy testing almost lead to the extinction of frogs? In 1960, scientists researched and invented a pregnancy test tool, so they decided to "let the frog go back to the mountain", but it was such a move that inadvertently planted the root cause. In 1993, inexplicable deaths of frogs occurred in many parts of the country. Scientists boldly guessed that it may be related to the African clawed frog used for pregnancy tests. After testing, scientists found that the dead frogs were infected with chytrid fungus.

It is understood that it was the African clawed frog that was first found to be infected with the chytrid fungus. Earlier, because of the pregnancy test, the African clawed frog was transported to all parts of the world, resulting in the death of the local frog due to the infection of the chytrid fungus. What is even more amazing is that , in 695 species of amphibians in 71 countries, the phenomenon of chytrid fungus has appeared. In just ten years, a large number of amphibians have died and many species have become extinct. Fortunately, humans invented More advanced and gentle methods of pregnancy testing have stopped the harm and extinction of animals.

However, today's pregnancy test tools are mostly carried out by detecting urine, and the accuracy rate is very high, but in the process of using, there is a very interesting discovery, pregnancy test sticks can not only test women's pregnancy, Even men can detect two bars, but this does not mean that it is good news, but cells in certain parts of the body may become cancerous, so don't underestimate this pregnancy test stick , what do you think about this? Have you secretly tested it? Welcome to leave a message in the comment area below, see you next time!