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Cell Press News. DNA that is left in the remains of long-dead plants, animals, or humans allows a direct look into the history of evolution. So far, studies of this kind on ancestral members of our own species have been hampered by scientists’ inability to distinguish the ancient DNA from modern-day human DNA contamination. Now, research by Svante Pääbo from The Max-Planck Institute for Evolutionary Anthropology in Leipzig, published online on December 31st in Current Biology, overcomes this hurdle and shows how it is possible to directly analyze DNA from a member of our own species who lived around 30,000 years ago.
From today, I will collect any references about RNA silencing. RNA silencing is a remarkable type of gene regulation based on sequence-specific targeting and degradation of RNA. The term encompasses related pathways found in a broad range of eukaryotic organisms, including fungi, plants, and animals. In plants, it serves as an antiviral defense, and many plant viruses encode suppressors of silencing. The emerging view is that RNA silencing is part of a sophisticated network of interconnected pathways for cellular defense, RNA surveillance, and development and that it may become a powerful tool to manipulate gene expression experimentally.
“Evolution and Religion” is a book conducted in dialogue form. It is laid out in five chapters, each of which is a dialogue between the same four “guests” and a “host” on a public television show called Eternal Questions. As the title points out, the topic of these five episodes all focus on various questions to do with the relationship between evolution and religion.
Flowering plants have evolved a complex fertilization mechanism involving two male and two female gametes. Double fertilization produces the embryo and the endosperm, which protects the embryo and regulates trophic interactions between the embryo and the mother. Since the discovery of double fertilization at the end of the ninetieth century by Guignard and Nawaschin, this unique reproductive process has remained rather enigmatic. Direct cytological observations are difficult as the dynamic interactions between relatively small gametes takes place deep in the surrounding maternal tissues.
Last post I reported Gene that switches on ‘essence of male’ was discovered. Now i will tell you the background of find it. Firstly abstract background. The unique double fertilization mechanism in flowering plants depends upon a pair of functional sperm cells. During male gametogenesis, each haploid microspore undergoes an asymmetric division to produce a large, non-germline vegetative cell and a single germ cell that divides once to produce the sperm cell pair. Despite the importance of sperm cells in plant reproduction, relatively little is known about the molecular mechanisms controlling germ cell proliferation and specification.
《The Double Helix: A Personal Account of the Discovery of the Structure of DNA》is writing by James Watson. Noted watson’s own personal experience in mind of major event. The book not only has scientific knowledge, there are scientific methods of work.
In 1953, by identifying the structure of DNA, Francis Crick and James Watson revolutionized biochemistry and won themselves a Nobel Prize. At the time, Watson was only twenty-four
Today I revised the font of this blog, because the browser displays can not unified, so set it become a so-called “safe fonts”, that is, all platforms, including Windows, Mac, Linux, etc that are pre-installed fonts, so that could avoided bugs at some foreign web browser. The mainstream of the “safe fonts” principal has nine kinds: Arial, Arial Black, Comic Sans MS, Courier New, Georgia, Impact, Times New Roman, Trebuchet MS and Verdana.
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