In recent days, the Sanxingdui site has really spread all over China, and it has also attracted the attention of many foreign archaeologists, especially the golden half-face mask and the utensils that look particularly like hot pot. Not to mention, human beings are really an amazing creature. Although the evolutionary history of human beings can be traced back to , it seems to be only a few million years old, but we not only have a dazzling ancient civilization waiting to be discovered , There is a chance to live on a planet outside the earth.
But at the same time, human beings are also a kind of creatures that may have a huge impact on the survival of other creatures, and even bring major hidden dangers to their descendants. Why do you say that? The rapid development of human society in the past 100 years has indeed allowed everyone to live a more convenient and technologically advanced life. However, the increase in a large number of greenhouse gas emissions, the destruction of wildlife habitats over the years, etc., have all contributed to the earth’s ecosystem Stability is destroyed.
When glaciers and permafrost melt, more and more dead bodies of ancient creatures are exposed, and some ancient viruses may come back to life again. The sea level also gradually rises due to the massive melting of glaciers, while groundwater is affected. Co-mining has brought about the problem of land subsidence, which means that the area of land where humans can survive will become smaller, and viruses that may pose a threat to human reproduction may appear more frequently. Recently, Australian scientists have conducted another experiment that worries many people. It is related to each of us. The research structure has caused serious ethical problems as soon as it was published.
This is how the first complete models of "human embryos" were artificially manufactured. They were made from two different experimental raw materials. Let's talk about the first embryo experiment: the raw materials for this experiment are only adults. Although the cell structure in human skin has not undergone a normal fertilization process, the human embryos cultured in these laboratories are equivalent to the combination of sperm and egg and successfully implanted in the uterine wall for four days. Look like.
The whole process in a nutshell,That is, human skin cells are genetically programmed to form a structure similar to embryonic cells. When they grow on the 3D home studied by the researchers for a period of time, they form a structure very similar to the structure of human blastocysts. Contains hundreds of cellular components.
The next thing I want to talk about is the embryo experiment done by the second research group. Compared with the first research group, the raw materials they prepare are two kinds of stem cells, which are stem cells in adult skin tissues. And embryonic stem cell , and gave it a special name, which is induced pluripotent stem cell. These stem cells finally become alveolar, mainly relying on " growth factor ", which is a special chemical in the mouth of researchers, which can turn stem cells into blastocysts.
At this time, some people may say, are these scientists what they are doing when they are full? Of course not. The purpose of this experiment is actually to prove that the human-made blastocyst has similar behaviors to real blastocysts. Both contain 3 cell types, forming a hollow sphere appearance. Although they are not implanted in the real uterine wall, they can be " implantation" in different positions of the designated plastic plate in the experiment.
However, after the publication of this experimental result, it not only caused serious moral problems, but also caused many people to worry about it, because this is the first complete model of a human embryo in history. But what I want to say is that although this experiment is equivalent to simulating the formation process of human embryos, it does not realize the reproduction of human embryos in the true sense. Although the experimental materials come from humans themselves, they still cannot get past the blastocysts. Stage will die.
Moreover, in previous mouse experiments, scientists failed to survive the mouse blastocyst implanted into the mouse uterus, and the reason for the failure is currently speculated to be due to artificial blastocysts and There are differences in gene expression in real blastocysts.On the other hand, this technology can create more similar structures, which is also of positive significance for humans to recognize their own early development.
Moreover, there are also relevant regulations in the world. As long as it is a human embryo in the experiment, its survival time cannot exceed 14 days, which can effectively prevent the implanted blastocyst from directly evolving into the original stripes. Both of the research teams of the company have also complied with the requirements of the relevant rules, so you don’t have to worry too much.
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