Technicians typically use a pie-shaped sample from a long bone, such as a femur or humerus, to extract DNA from remains, he said. The process involves creating a magnetic field to reduce the bone to powder.
“They are looking for osteocytes — the cells that secrete the bone — but the challenge is whether they can get enough cells,” Eisenberg said.
Then why take the skull and leave the bones? I wish I was a scientist....
I'm not sure why they're interviewing Eisenberg, who's in Texas. There's an interview that was posted either today or yesterday (sooo sleepy, can't think straight!) with the forensics guy in charge in Richmond. (Yes, I will go find the link!). He was talking about taking DNA from teeth, I think.
Anyway, as to why just the skull? First, do preliminary ID with dental records. Then, maybe extract DNA from a tooth?
Or maybe not. Maybe it is as Eisenberg states, and the long wait for official results is due to the delay in taking the femur bone from the crime scene to the ME in Richmond.
:bedtime: , but first let me go find those links.
ETA: Okay, so let me correct some of my statements from above, now that I've checked the links. :blushing:
First off, here's the segment from CNN that talks about the skull being examined:
http://situationroom.blogs.cnn.com/2014/10/21/skull-examined-in-hannah-graham-case/?hpt=sr_mid
Brian Todd reports on what investigators are doing with remains discovered in the search for Hannah Graham.
Big thanks to
HartsX3 for posting that link!
A little over a minute into the video, Brandon Garrett, of UVA Law School (NOT the forensics dude -- oops!) implies that they are using the skull to test for DNA if there aren't enough body fluids and/or flesh left on the victim. It was at the end of this video that Jeffrey Ban, "Virginia's chief DNA analyst," makes the strange comment about chemical degradation when explaining it's difficult sometimes to get conclusive samples on clothing or other items.
I think I also confused the DNA tooth issue because of a great source linked by
DizzyB early yesterday morning:
https://www.icrc.org/eng/assets/file...c_002_4010.pdf
I just finished reading a sort of handbook linked above, about best practices for DNA IDing. Things I didn't know: teeth, followed by the femur, are the best locations to extract DNA from when remains are only skeletal. A good, if long read.
Not sure if anybody is even going to bother coming back to see if I checked, but oh well. Now I really am going to bed. :bed: