This document discusses different methods of DNA isolation including the Maxwell 16 Plant DNA Kit method, spin column method, and CTAB method. It explains the structure of DNA and importance of DNA extraction for uses such as genetic testing, body identification, and analysis of forensic evidence. DNA can be stored long term at temperatures of -20属C, -80属C, -196属C or dried at room temperature. Isolated DNA has applications in understanding plant individuality, plant modification, forensic analysis, and solving historical puzzles.