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Vocab
Hair
Fiber
Fiber Analysis
Hair Anaylsis
100
Anagen Phase
What is the first growth phase called?
100
Keratin
What is the protein that makes up hair?
100
the smallest unit of textile, length greater than diameter
What is a fiber?
100
carpet, rugs, clothing, bedding
Name four carriers of fiber evidence.
100
Follicular tag
This is a translucent piece of tissue surrounding the hair's shaft near the root and is a rich source of nuclear DNA.
200
Cortex
What contains the hair's pigment?
200
chemical compounds that reflect certain wavelengths of visible light
What are pigments?
200
natural and synthetic
What are the two main types of fibers?
200
Paper bags
How are clothing articles with potential fiber evidence packaged?
200

True/False: There is a high rate of error in hair analysis.

TRUE

300
Manufactured Fibers
What are man-made fibers called?
300
round or oval -----curly or straight
What are two shapes and two texture qualities hair can possess?
300
cotton and wool
Name two natural fibers
300
comparison microscope
This method is used to examine color and diameter characteristics
300
1. scale structure 2. medullary shape 3. medullary index
Name three features that distinguish human from animal hair.
400
Ten times.
How much is the eye piece magnified?
400
the cuticle
What is the hair's outer covering that is composed of overlapping scales?
400
polyester, nylon, spandex, lycra, rayon
Name two synthetic fibers.
400
chromatography
a fiber's dye composition can be analyzed using this method
400
head- 50 pubic- 24
What is a standard sample of head hair and pubic hair?
500
Follicular tag
What part of the hair contains the DNA?
500

True or False: Different hairs on the same person will be exactly the same

FALSE

500
Burn test, stain test, microscope test, and solvent test
List the 4 tests we performed to determine an unknown fiber.
500
infrared spectrophotometry
this is a rapid and reliable method for identifying the class of fiber; characterizes a fiber by the amount of infrared light that is absorbed
500
Found in the mitochondria of cells in the shaft of the hair. Used to narrow down a potential suspects.
Where is mitochondrial DNA found and what is it used for?