What does heat do to DNA-digesting enzymes

Gel-shift effects can be minimized by heat inactivation of enzymes after digestion, typically by incubation at 65°C or 80°C for 10 to 20 minutes. ... These methods will denature the enzyme, releasing it from the DNA fragment (Figure 9B).

The salt in the sea water dehydrated the sailor because her body could not take in the amount to salt in the sea water