記憶度
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問題一覧
1
Who was the person who analyzed the bloodstain pattern from the Samuel Sheppard case
Paul Kirk
2
If the sample is positive for human blood in the precipitin test how do you know?
a cloudy precipitate will form where the 2 layers meet
3
What is the proteins
plasma
4
The are of convergence
is the point of origin,
5
Passive bloodstains are
drops created by the force of gravity acting alone.
6
If the blood drop falls straight down at a 90 degree angle it is
round
7
What is swipe
wet blood is transferred to a surface that did not have blood on it
8
Blood spatter analysis (BPA) is the use of
physics and math to interpret blood stain patterns to solve a crime
9
On clean glass or plastic blood droplet has
smooth outside edges
10
How can you determine the impact angle
width/length (arcsin)
11
What is the point of origin- area of convergence
3D view using lines of convergence and angles of impact at least 2 drops of blood to identify the source and location of blood spatter
12
Medium velocity bloodstains are produce with
more energy or force than gravity (more than 25 ft/sec)
13
What is the precipitin test made of
serum made in rabbit
14
What is satellite drop of blood
secondary drop formed when some blood breaks free from the main contact drop of blood
15
What is another factor affect shape of blood droplet?
velocity
16
If you have blood type A what antigens do you have
A
17
What is terminal velocity
the greatest speed to which a free falling drop of blood can accelerate in air.
18
What are some factors affecting shape of blood droplet?
texture of the target surface.
19
What is the point of origin- area of convergence use to identify the source and location of blood spatter
two different drops of blood, lines of convergence, angles of impact
20
If you have blood type B what antigens do you have
B
21
What are antigens
molecules or cells that react to antibodies
22
What is wipe
a non blood object moves through a wet bloodstain
23
Blood typing
think the table with the control
24
A free falling drop of blood forms a
sphere or ball
25
If you have blood type A what antibodies do you have
B
26
If a blood droplet elongates as the angle decreases from 90 to 0 it is
elliptical
27
What are the six patterns of BPA
passive drops, arterial gushes, splashes, smears, trails, pools
28
What is the answer
A-positive
29
at is another term for red blood cells
erythrocytes
30
How do you test if it is human or animal blood?
precipitin test
31
What is Backspatter
blood that is directed back toward the source of energy
32
If you have blood type AB what antibodies do you have
none
33
What does the serum of the precipitin test contain
antibodies against human blood
34
Directionality
relates to the direction a drop of blood travels in space from its point of origin
35
Example of passive blood stains
a nose bleed
36
What is hemoglobin
RBC
37
What is the angle of impact
angle at which blood strikes a target surface
38
What is another definition of BPA
a technique that seeks to piece together the events that caused bleeding
39
If you have blood type AB what antigens do you have
A,B
40
What are some of the important crime scene facts which may be determined using blood spatter analysis?
the number of blows, the position of the victim, movement of the victim, what the weapon was like, the distance between surface and origin of blood, the points of origin, movement and direction, type of direction
41
If you mix A blood and B blood, what will happen?
agglutination
42
What is a presumptive test for invisible blood
chemiluminescence, fluorescence, luminol
43
What are antibodies
are proteins secreted by WBCs that attach to antigens to destroy them
44
What does blood circulate
nutrients and oxygen, removes wastes, fights infection
45
What is another factor affect shape of blood droplet?
height
46
On rough surface blood droplet has
spines, scalloping on the edges
47
High velocity blood stains
the force necessary to produce this size spatter is greater than 100 ft per second
48
What is the blood type
O-positive
49
What is the blood group antigen
RBC
50
If you have blood type O what antigens do you have
none
51
What is bloodstain transfer
when a bloody object comes into contact with a surface and leaves a patterned blood image on the surface.
52
If you have blood type B what antibodies do you have
A
53
What are the presumptive tests for blood
hydrogen peroxide, Adler test, Kastle Meyer test. Malachite green, Hemastix
54
Example of high velocity bloodstain
gunshot, explosion (mist like)
55
What is another factor affect shape of blood droplet?
angle of impact
56
A blood droplet remains spherical in space until it collides with a _____
surface
57
Example of medium velocity blood stain
a punch
58
A spherical drop will break when
it hits another object, when acted upon by some force
59
What is agglutination essentially
clumping of RBCs
60
What is cast off
blood that is thrown from an object in motion
61
If you have blood type O what antibodies do you have
AB
62
What is another term for white blood cells
leukocytes
63
At will luminol solution produce
a faint blue light
64
What is DNA
WBC
65
What is in the composition of blood
cells, plasma, RBC, WBC, Platelets
66
Bloodstain patterns are considered _____ evidence in a courtroom
circumstantial