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23 Cards in this Set
- Front
- Back
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class evidence |
material that connects an individual or a thing to a certain group |
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comparison microscope |
a compound microscope that allows the side-by-side comparison of samples, such as hair or fibers |
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cortex |
the region of hair located outside of the medulla containing granules of pigment |
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cuticle |
the tough outer covering of a hair composed of overlapping scales |
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hair follicle |
the actively growing root or base of a hair containing DNA and living cells |
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individual evidence |
a kind of evidence that identifies a particular person or thing |
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keratin |
a type of fibrous protein that make up the majority of the cortex of a hair |
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medulla |
the central core of a hair fiber |
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melanin granules |
bits of pigment found in the cortex of a hair |
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neutron activation analysis |
a method of analysis that determines composition of elements in a sample |
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trace evidence |
small but measurable physical or biological material found at the crime scene |
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amorphous |
without a defined shape; fibers composed of a loose arrangement of polymers that are soft, elastic, and absorbing ex). cotton |
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crystalline |
regularly shaped; fibers composed of polymers packed side by side, which make it stiff and strong ex). flax |
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direct fibers
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the passing of evidence, such as a fiber, from victim to suspect or vise versa.
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fiber
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the smallest indivisible unit of a textile, it must be at least 100 times longer than wide
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mineral fiber
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a collection of mineral crystals formed into a recognizable pattern
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monomer
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a small molecule that may bond to other monomers to become a polymer
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natural fiber
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a fiber produced naturally and harvested from animal, plant, or mineral sources
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polymer
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a substance composed of long chains of repeating units
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synthetic fiber
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a fiber made from a man-made substance such as plastic
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secondary transfer
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the transfer of evidence such as a fiber from a source (for example, a carpet) to a person (suspect), and then to another person
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textile
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a flexible, flat material made by interlacing yarns (or "threads")
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yarn
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fibers that have been spun together
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