Concentration of Molecules Nucleic acids RNA Simplified models Analytical expressions Asymptotic expressions Clupeiformes Complex topology Critical temperatures Engraulidae Engraulis anchoita Feynman diagrams First order Flexible chains Hermitian Low temperatures Pairing interactions Partition functions Phase transitions Polymer systems Probability density function Pseudoknot RNA folding RNA molecules Random matrix models Rna molecules Spatial configurations TS modelling Technetium