http://www.ncbi.nlm.nih.gov/pubmed/23161674
Analysis of ~1900 RNA containing structures v ~50 non-redundant ones in http://papers.gersteinlab.org/papers/nucprot
http://www.ncbi.nlm.nih.gov/pubmed/23161674
Analysis of ~1900 RNA containing structures v ~50 non-redundant ones in http://papers.gersteinlab.org/papers/nucprot
Interesting account of work on sphere packing. As the number of spheres increases from 4 (the tetrahedron), new things emerge : new seeds not built from previous solutions and flexible solutions that can have internal subparts twist without breaking contacts. Great animations of the later.
http://www.americanscientist.org/issues/pub/the-science-of-sticky-spheres