Rooted graphs associated to RNA secondary structure.
 Following Tamar Schlick's approach, in this talk we will provide basic ideas to associate a rooted graph to the secondary structure 
of ribonucleic acid, RNA. We will focus on analyzing some chains of the organism Saccharomyces cerevisiae, which is a yeast, and 
we will associate a rooted graph to them. On the other hand, taking the hypothesis that some motifs are preserved in the case of the 
secondary structure of long non-coding RNA chains (lncRNA), we will use both a set of lncRNAs and a set of coding RNAs of 
Saccharomyces cerevisiae to search for substructures that are repeated in each of these two sets. These substructures will be searched
 in a third set which contains various RNAs from the same organism. If the detected motifs are found, this would be an indication that 
this RNA is an lncRNA.