Chapter 10 Flashcards
serology
study of bodily fluids left at crime scene
presumptive test
highly sensitive but not specific for a particular substance
Confirmatory test
test for substance in question and only that substance
blood
tissue composed of plasma
3 types of cells in plasma
red
white
platelets
Erythrocytes
transfers oxygen ans CO2 through body
red blood cells
Leukocytes
white blood cells
active in immune system
Platelets
fragments of cell, no nuclei and clotting
genetic markers
blood group
class of antigens produced by allelic genes
ABOVE
Presumptive tests reacts?
with hemoglobin in blood
Presumptive color test
hydrogen peroxide reacts with hemoglobin and changed colors
presumptive light emission
if area is large
luminal or flourescein
Confirmatory test for blood
utilize the formation of crystals with heat and chemicals
Takayama test
salmon colored crystals
Species origin
Ouchterlony test
antigen reaction between human and human antiserum
Electrophoresis
diffusion of antibodies and antigens on electrically charged gel
Test for semen
Fast blue B
christmas tree stain
Prostate-specific antigen, P30
Bloodstain pattern analysis
analysis or dispersion, shape, volume, pattern, of blood
Angle of impact
arc sin kf width/length of stain
point of convergence
area where directionality of stains converge on surface
Point of origin determining types
stringing
graphing
trigonometric
stringing
string to base of stain
Trigonometric
average of stains is the point of origin
Three types of splatter
Low
medium
high velocity impact spatter
Low impact
blunt object not traveling very fast
Medium impact
faster velocity
High impact spatter
only gunshot
1000< ft/sec
aspirated blood
blood with oxygen bubbles
