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How does Luminol detect blood

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Restricting enzymes respond to specific base pair sequences ... Forensic Entomology ... Problems in Forensic Entomology. Some species are difficult to identify ... – PowerPoint PPT presentation

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Title: How does Luminol detect blood


1
How does Luminol detect blood?
  • Blood is slightly alkali
  • Hemoglobin is a ferrous compound
  • Metals are a catalyst in the reaction between an
    alkali and Luminol

Fe
Hemoglobin
2
Luminol
3
DNA Identification
  • Add restricting enzymes
  • Restricting enzymes respond to specific base pair
    sequences
  • DNA breaks apart at loci

4
Gel Electrophoresis
  • Place extracted DNA into wells in agarose gel
  • Apply electric current
  • Fragments sort by size
  • Expose DNA with radioactive markers to film

5
Compare Results
  • Examine results of DNA from sample
  • Examine results of DNA from individual
  • Compare patterns

6
Who Should Access Your DNA?
  • Law enforcement?
  • Government agencies?
  • Insurance providers?

The US Department of Defense has a DNA Registry
for members of the Armed Forces
7
Race in Forensic Science
When you talk about race as a relationship, it
prevents anyone from giving it false
meaning. Dr. Troy Duster
8
DNA Identification of Race
  • Acquire body fluids or tissue
  • Perform DNA ID process
  • Examine 6 loci
  • Determine race of fluid/tissue origin

9
Dental Arcades
  • Clockwise Native
  • American, African
  • American,Caucasian
  • Photographs from Osteointeractive, Utah Medical
    Library

10
Forensic Entomology
Observing arthropod presence and stages to
determine time and location of an event
11
A Common Indicator
  • Presence of blowflies
  • Stage
  • Adult
  • Egg
  • Larva
  • Pupa
  • Location

12
Problems in Forensic Entomology
  • Some species are difficult to identify
  • Fauna varies from region to region

13
An alternative?
  • Relatively thin hair
  • Readily available
  • Numerous variables can be tested

14
Forensic Anthropology
Piecing together events from the past based on
the study of human remains
15
Determining Height
  • Measure your foot and record its length.
  • Estimate your height by performing the
    calculations below.

Height (foot length x 20) / 3
16
Examples of Forensic Anthropology
  • Identify nutritional deficiencies
  • Note presence of disease
  • Recognize trauma
  • Determine race

17
Is it okay to excavate?
  • Ancestry
  • Desecration
  • Age of Remains
  • Pursuit of knowledge
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