Figure 3

DNA yields (ng per mg of starting tissue) and DNA condition. Yields are given for fresh (time = 0 hours) tissues and tissues that had been left at 21°C for 48 hours (time = 48 hours), for each of the three microcentrifuges: electric lab microcentrifuge (L), battery-operated microcentrifuge (B) and manually-operated microcentrifuge (M). DNA condition (degree of degradation) is indicated by shading of the rectangles (bars above indicate one standard deviation, based on sample calculation of means and SD, n = 5). Black rectangles indicate primarily high-molecular weight DNA, medium grays indicate moderate degradation (some diffusion observed for the high-molecular weight band), and light gray indicates extensive degradation (absence of distinct high-molecular weight band, with bright trailing lower molecular weight fluorescence).