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23 Cards in this Set
- Front
- Back
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class evidence |
material that connects an individual or 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 of hair or fibers |
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cortex |
the region of a hair located outside of the medulla containing granules of pigment |
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cuticle |
the tough outer covering of the 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 makes up the majority of the cortex of a hair |
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mdulla |
the central core of a hair fiber |
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melanin granules |
bits of pigment found in the cortex of 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 amounts of physical or biological material found at a 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 (for example, cotton) |
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crystalline |
regularly shaped; fibers composed of polymers packed side by side, which make it stiff and strong ( for example, flax) |
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direct transfer |
the passing of evidence, such as a fiber, from victim to suspect or vice versa |
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fiber |
the smallest indivisible unit of a textile, it must be at least 100 times longer than wide |
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mineral fiber |
a collection of mineral crystals formed into a recognizable pattern |
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monomer |
a small molecule that may bond to other monomers to become a polymer |
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natural fiber |
a fiber produced naturally and harvested from animal, plant, or mineral sources |
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polymer |
a substance composed of long chains of repeating units |
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synthetic fiber |
a fiber made from a man-made substance such as plastic |
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secondary transfer |
the transfer of evidence such as a fiber from a source (for example, a carpet) to a person(suspect), and then to another person (victim) |
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textile |
a flexible, flat material made by interlacing yarns (for "threads") |
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yarn |
fibers that have been spun together |
