Life Sciences

This article focuses on how China scientists obtained asexual reproduction of mice, introduces the process of using induced stem cell method to cultivate "small" cloned mice, compares the differences between this technology and traditional cell mixed cloning method, and expounds the importance of this achievement, the potential risks of induced stem cell method, and the research progress of subsequent stem cell technology.

This paper discusses the question of "Can Einstein be resurrected by cloning technology?" and points out that this idea cannot be realized with the current level of human science and technology. The reason is that cloning technology can only replicate genetic material, but cannot replicate human acquired experience, thoughts and experiences. and other spiritual activities related to content

This article focuses on the core issue of whether mixed cells can be used to realize the dream of "eternal life". It introduces the public's imagination about the application of human all-powerful stem cells caused by the cloning of Dolly the sheep, including using all-powerful stem cells to "regenerate" passed children, harvesting organs for use in the human body through freezing embryos to extend life. It then points out that the maker of all-powerful stem cells faces problems such as difficult to define ethical relationships, inconclusive legal inheritance relationships, and possible abuse of technology to endanger society. Therefore, the dream of realizing "immortality" by making mixed cells cannot be realized, and it is called for the good use of this technology to contribute to the development of human science.

This article focuses on the question of whether "Dolly" and white-faced ewes are exactly the same. It points out that almost all of the genetic material of "Dolly" comes from the nuclei of the mammary cells of white-faced ewes, and only a small amount comes from the mitochondria of the egg cells of black-faced ewes. The amount of genetic material in the mitochondria is insignificant and only serves the function of mitochondria, and has little impact on the physical development and overall characteristics of "Dolly". Therefore,"Dolly" is basically the same as the white-faced ewes of the same age.

Focusing on the theme of "Why did Dolly make a sensation in the world?" This article introduces the situation that the report on Dolly the sheep published in the British "Times" in 1997 attracted great attention around the world. It details the birth process of Dolly, and points out that Dolly's birth is a milestone in the history of bioengineering technology. It proves that the mixed-cell method can artificially produce alltipotent stem cells. Compared with traditional animal hybridization technology, the related technology takes less time and can stably maintain heterosis. It can also be used for the breeding of endangered rare animals, and is also useful in the medical field.

Focusing on the question of "when will the door to stem cell treatment be really opened?" This article introduces many results achieved in the clinical application of stem cell technology. At the same time, it points out that the development time of this technology is still short and is currently in the research and experimental stage. Replacement at the organ level is still a distant goal, and we need to be wary of relevant false publicity and hype.

Focusing on the question of "Can stem cells become organs" warehouses "? This article introduces the self-renewal and differentiation characteristics of stem cells, the principles of cell differentiation, the functional limitations of stem cells in the human body, the goals of stem cell technology and related research progress in obtaining stem cells.

The article "How to Get Stem Cells to" Register "introduces the specific method for scientists to isolate stem cells from various types of cells by identifying unique proteins on the surface of stem cells and using antibody fluorescent labeling and electric field deflection technology.

This article focuses on the popular answer to the question of "Are stem cells killed by dehydration?" explains the meaning of "stem" as a trunk in the name of stem cells, and introduces the source of human cells, the classification of stem cells, the characteristics and physiology of asymmetric division., and the application prospects of stem cells in disease treatment and autologous organ cultivation.

This paper answers the question of how cells can achieve differentiation, pointing out that cell differentiation is the result of differential expression of genes (also known as sequential expression), that is, different cells or cells of the same species in the same organism only express part of the gene at different time periods, and takes different development stages of the human body as examples for explanation.

This article focuses on the question of "why do somatic cells of the same organism have the same genome?", explaining that all somatic cells of the same organism are produced by the same fertilized egg through mitosis. During mitosis, the chromosomes are copied once and the cells divide once. Therefore, the genomes of daughter cells and parent cells are the same. It also explains that the differences in shape, function, and physiological characteristics of cells with the same genomes are the result of cell differentiation.

This article describes the formation process of sperm and egg. After male puberty, the testicular spermatogonia undergoes 6 mitosis and 1 meiosis to produce sperm cells, and the sperm cells develop into sperm; the oogonia in female embryo becomes primary oocytes, and meiosis after puberty forms secondary oocytes. After fertilization, the number and development of female primary oocytes are also mentioned.