Double helix heat released

Figure 1.15 Double-helix formation and entropy. When solutions containing DNA strands with complementary sequences are mixed, the strands react to form double helices. This process results in a loss of entropy from the system, indicating that heat must be released to the surroutrdings to avoid violating the Second Law of Thermodynamics.

On the basis of this analysis, we expect that the double helix cannot form wilhout violating the Second Law of Thermodynamics unless heat is released... 

Forms a heat-resistant and clear gel with low concentration (0.2%) under the existence of ions. The gel has a hard and brittle feeling when eaten. There is a tendency to lose water although it has good flavor upon release. The K-type gellan gum is found by x-ray diffraction to have a double helix structure. It is thought the association of the helices forms a 3D network structure. 

---