Dr. Furton- small chemicals move thru faster than big ones...mass spectrum breaks out chemicals and then it compares to known standards.....buy chemicals run on your instrument insert and compare to your results...chromatogram gives relative abundances different sizes of peaks give relative ratios but ultimately need to run calibration curve with known samples with the amounts.....only way to determine calibration in order to determine .....can't really tell absolute amounts just relative ratios of concentration units chemicals within the same run.....take each peak of different chemical - each chemical is a different color.....this is one person - relative ratios of 24 primary odor compounds we can discriminate 99% certainty it is same person....all people are living - identify what chemicals body give off...human bar code....each line is a different person...different chemicals for different person give off....different pattern of chemicals -everyone different.....doing analysis you insert confidence ....Spearman-Rank most abundant to least abundant....done other statistical methods but this most reliable ...so which chemicals are most common and relative abudance of those...compare bar graphs on left 7 living individuals...and 6 deceased individuals...the deceased ones look more similar to each other then the living....what chemicals are most important to locate human remains....table shows the 20 most abundant chemicals...majority of samples 21 indiv. in a morgue and 6 deceased ind.....what chemical compounds most abundant and relative ratio.....common chemicals and if nothing there they were not present in both.....done this for other decomp animals.....example show decomposing k9's, tuna, chicken, lamb, beef portions of the animal and whole human deceased individuals...what are compounds come from non-human decomp events...excluding ones not related to human remains..
Also have a aid to show decomposing remains.....Lavellier mike - witness steps down to the whiteboard....looking @ DT #EW demonstrative purposes.....separate all complex chemicals ....find thousands of compounds...refine down to 5-12 compounds...these are different functional groups of chemicals...classified into categories...acids, esthers, halogens?, different types of chemicals have different sources.....alcohols, halogenated compounds in human remains....different studies assigned numbers ....there are 8 studies in this particular one...another study published last week not included in here....references came out of the publication....include papers from Dr. Vass highlighted in yellow....breakdown of Dr. Vass finds vs. what other people find....objection - approach sidebar!