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| a molecule consisting of many identical repeating units; polymers can be naturally occurring or synthetic. |
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| the tough, clear outer covering of the hair shaft composed of overlapping scales. |
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| middle layer of the hair shaft that provides strength; comprises most of the hair mass; the region of a hair located outside of the medulla containing granules of pigments. |
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| the spongy, central, interior core of hair that gives it flexibility; appears as a canal in the middle of the shaft |
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| A type of fibrous, tough protein polymer made up of about 20 amino acids that makes up the majority of the cortex of a hair. The principle protein is cysteine, which allows strong disulfide bonds to form between protein chains. All that sulfur in keratin also accounts for the distinctive smell of burning hair. |
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| irregularly shaped air spaces in the cortex |
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| in hair morphology, slight waviness |
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| period of growth in the hair cycle, averaging 3 – 5 years. |
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| intermediate period of hair growth, lasting about 3 weeks. |
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| final phase in hair growth, resulting in the loss of hair over about 3 months. |
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| patterns that demonstrate the wave nature of light, resulting from constructive (additive) and destructive combinations of light waves. This happens when a small object deflects coherent light so that the wave fronts travel different distances which is called diffraction. |
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| a natural pigment found in the skin. UV rays in sunlight make it more concentrated, causing tanning. |
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| bits of pigment found in the cortex of a hair. |
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| Neutron activation analysis |
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Definition
| a method of analysis that determines composition of elements in a sample. |
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| a link between an unknown and known sample. |
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| term used in forensics to describe a sample of unknown origin; for example, a hair was found on a jacket, but we do not know whose head it came from. |
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| term used in forensics to describe a sample of known origin; for example, we know that this hair was pulled out of so-and-so’s scalp. |
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| a specific product of a substance, formed by chemical processes in the body. |
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| a test result that comes out positive when it should not; often caused by contamination or failure to run a control. |
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| the actively growing root or base of a hair containing DNA and living cells. |
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| small but measurable amounts of physical or biological material found at a crime scene. |
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| material that connects an individual or thing to a certain group. |
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| kind of evidence that identifies a particular person or thing |
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