Chris_Halkides
Penultimate Amazing
- Joined
- Dec 8, 2009
- Messages
- 12,574
100-200 picrograms, not 1.4 nanograms
Daydreamer,
According to Raffaele's appeal, the total amount of DNA on the clasp is 1.14 nanograms, and the amount tentatively attributed to Raffaele is in the range of 100-200 picograms, dependending on how one does the estimate.
DNA Sample Sizes
After reading many of the posts here about DNA on the bra clasp and knife, I wanted to get a feel for just how much material (DNA) was on the items. I have read that the amount of material tested on the bra clasp that was attributed to RS is 1.4 nanograms and the amount attributable to MK on the knife was 10 picograms. So, to get an idea of much that is, I did an internet search on the size of a couple of items with which we are somewhat familiar. It turns out that the average size of a grain of pollen is about 247 nanograms, which is 166 times greater than RS’s material and nearly 25000 times greater than the MK material. I also found out that weight of a normal water droplet in Cyrus cloud is 62 nanograms, which is 44 times greater than RS’s material and nearly 6000 times greater than the MK material. I would venture to say that these sample sizes are beyond the unaided visual capabilities of humans. Considering these sample sizes, I think it would take extreme care to prevent contamination, especially outside the lab environment. Hope this helps folks to get a feel for what the investigators are dealing with.
Daydreamer,
According to Raffaele's appeal, the total amount of DNA on the clasp is 1.14 nanograms, and the amount tentatively attributed to Raffaele is in the range of 100-200 picograms, dependending on how one does the estimate.
