FORS-2107EL Study Guide - Quiz Guide: Keratin, Long Term Ecological Research Network, Cysteine
27 Jun 2018
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Hair Quiz Review
-Locard’s principle is on effect when ever we come into contact with something or someone,
so we leave a little bit of ourselves, and take away a little bit of what we contacted
-Things hair analysis can do:
-Link a suspect to the scene of the crime
-Determine the entrance or exit route of a criminal
-Show that contact has occurred between a suspect and a victim
-Identify clothes or shoes disposed of by a suspect
-Determine the contact point of a victim with an object, like a card
Hair
-Hair is primarily made of keratin, that is very tough and durable
-Hair fibres are 65-95% keratin
-Skin keratin is different then hair keratin, since skin had soft keratins, and hair has hard
keratins which don’t dissolve in water
-Cysteine is the most abundant amino acid found in hair
-Human hair can usually be distinguished from animal hair based on cuticle pattern and
medulla
Fibres
-Some fibres are natural (cotton, linen) or synthetic (rayon, polyester), or are derived from
animal hair (wool)
-Unique characteristics of fibres are colour, length, diameter, and cross sectional shape
-Usually collected with forceps (not as good) or through a vacuum fitted with a special filter, or
more commonly a sticky medium like tape
find more resources at oneclass.com
find more resources at oneclass.com
Document Summary
Locard"s principle is on effect when ever we come into contact with something or someone, so we leave a little bit of ourselves, and take away a little bit of what we contacted. Link a suspect to the scene of the crime. Determine the entrance or exit route of a criminal. Show that contact has occurred between a suspect and a victim. Identify clothes or shoes disposed of by a suspect. Determine the contact point of a victim with an object, like a card. Hair is primarily made of keratin, that is very tough and durable. Skin keratin is different then hair keratin, since skin had soft keratins, and hair has hard keratins which don"t dissolve in water. Cysteine is the most abundant amino acid found in hair. Human hair can usually be distinguished from animal hair based on cuticle pattern and medulla. Some bres are natural (cotton, linen) or synthetic (rayon, polyester), or are derived from animal hair (wool)
