time of death using entomology - ctreg14.org Sep 218:09 PM (1 of 18) ... Table 2: Constants and...
-
Upload
truongdang -
Category
Documents
-
view
214 -
download
1
Transcript of time of death using entomology - ctreg14.org Sep 218:09 PM (1 of 18) ... Table 2: Constants and...
Time of Death using Entomology*
http://users.usachoice.net/~swb/forensics/BF.htm
*based on "Visible Proofs" Forensic Views of the Body, Department of health and Human Services, 23 October 2006www.nlm.nih.gov/visibleproofs
Title: Sep 218:09 PM (1 of 18)
What do the following terms mean?
a. entomologyb. entomologistc. insect life cycled. postmortem interval (PMI)
Title: Sep 218:11 PM (2 of 18)
Blowfly Introductionlays eggs on dead animals to provide food for its larvaeblowfly life cycle is part of dead body decomposition processcan estimate time of death by evaluating stages of blowfly growth on cadaversscientist must make:
visual observationscollect insect evidencedetermine stages of developmentcalculate time of initial deposit of eggs
Title: Sep 218:15 PM (3 of 18)
in lab scientist grows specimens to confirm species and study growth stages
scientist then makes an estimate of time of death
Title: Sep 218:22 PM (4 of 18)
Blowfly Life Cycle
http://www.cmnh.org/site/Img/ResearchandCollections/InvertZoo/124_blowflylifecycleRW.jpg
Title: Sep 218:31 PM (5 of 18)
Fly egg masses
http://agspsrv34.agric.wa.gov.au/ento/forensic.htm
Title: Sep 219:24 PM (6 of 18)
larva first instar stage
http://www.deathonline.net/decomposition/corpse_fauna/flies/maggots.htm
Title: Sep 219:11 PM (7 of 18)
Larva second instar stage
http://www.deathonline.net/decomposition/corpse_fauna/flies/maggots.htm
Title: Sep 219:12 PM (8 of 18)
Larva third instar stage
http://www.deathonline.net/decomposition/corpse_fauna/flies/maggots.htm
Title: Sep 219:13 PM (9 of 18)
Fly Pupae
http://agspsrv34.agric.wa.gov.au/ento/forensic.htm
Title: Sep 219:14 PM (10 of 18)
Table 1. Accumulated Degree Hour (ADH) of the Green Bottle Fly
FROM TO TEMPERATURE HOURSADH (ACCUMULATED DEGREEHOUR)
EGG 1ST INSTAR 70 DEGREES F
70 DEGREES F
70 DEGREES F
70 DEGREES F
70 DEGREES F
23
27
22
130
143
70 x 23 = 1619 ADH
Title: Sep 218:35 PM (11 of 18)
Based on the chart:
How many hours does it take for a green bottle fly to become an adult fly?
Days and hours?
Title: Sep 218:50 PM (12 of 18)
How long, in hours, would it take a maggot beginning at the second instar stage to reach the third instar stage if the temperature was 77 degrees F?
Title: Sep 218:52 PM (13 of 18)
At what temperature would you need to keep the pupa to have the adult fly emerge in 7 days?
Title: Sep 218:53 PM (14 of 18)
Table 2: Constants and Variables
CONSTANT VARIABLE
LIFE CYCLE STAGES
TEMPERATURE
TIME BETWEEN THE LIFE CYCLE STAGES
ADH
Title: Sep 218:54 PM (15 of 18)
http://agspsrv34.agric.wa.gov.au/ento/_fpclass/forensic21.jpg
Title: Sep 219:27 PM (16 of 18)