12 marzo 2015
In 1953 Watson and Crick first published the discovery of the double helix structure of the DNA. They were able to visualize the DNA structure by means of X-Ray diffraction. Techniques, such as electron microscopy, allowed scientists to identify nucleosomes, the first and most basic level of chromosome organization. Until now it was known that our DNA is packaged by regular repeating units of those nucleosomes throughout the genome giving rise to chromatin. However, due to the lack of suitable techniques and instruments, the chromatin organization inside a cell nucleus could not be observed in a non-invasive way with the sufficient resolution.
http://feeds.sciencedaily.com/~r/sciencedaily/~3/uCqlK4c_Hf0/150312130800.htm
