TRACE EVIDENCE :

HOW CAN IT BE CLASSIFIED :
2 categories: Physical and Chemical

MICROSCOPES:

Differentes pieces: pointer,ocular,stage clip,arm,coarse adjustement,fine adjustement,body tube,nose piece,objectives,stage,illuminator.

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DETERMINING THE SIZE OF AN ORGANISM :
1.We must first know the size of the diameter of our field vision.(for each possible total magnification)
2.Magnification: Diameter of field:

32x 5000um 100x 1750um 400x 400um

( - - - - - - - - - - ) ex: the cell is only taking 2 off 10 2/10 of the scale. Which means its 0.2

The diameter of field used was 1750.
You do: 0.2x1750= ANSWER

HAIR LAB 5#:

Root: make the difference between human and non-human hair.

MEDULLA ET AUTRES :
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MEDULLA: • Absent,fragmented,intermittent and continuous. (different patterns • IS THE CENTRAL CORE

CORTEX:

• Determine color hair (CORtex=COLor)

• Contain melanin

• Largest portion of the hair

CUTICLE: • Made up of dead,translucent cells STRENGTH OF THE HAIR • Coronal,spinous or imbricate

HUMAN VS ANIMALS:

HUMAN:
SCALE PATTERN:imbricate
HAIR TYPES: facial,limb,pubic ETC

ANIMAL:
SCALE PATTERN:spinous,coronal et imbricate.
HAIR TYPES : guard hair(outer coat) Ground hair (underfur) Tactile hair (whiskers.)
THESE ARE UNIQUES CARACTERISTICS WHICH HELP A LOT SCIENTIST IN THEIR RESEARCH!!

HAIR SAMPLES:

• It is impossible to perfectly link hair samples to an individual. • Class evidence

!ONLY WAY IS IF IT CONTAINS DNA. FOLLICULAR TAG!

MAKING A MATCH:

1.having +/- 50 hairs from the suspect
2.compare by looking at: • Color,width,length • Diameter • Medulla • Cortex • Cuticle

FIBERS:
2 CATEGORIES: NATURAL AND MANMADE

CARACTERISTICS TO TAKE CARE OF:

Fiber type shape