Microscopes and Trace Evidence Flashcards
The final growth phase
telogen, the hair naturally falls out of the skin
Cuticle
the tough outer covering of a hair that i composed of overlapping scales
Glass that has been heat- or chemically treated to break into many small pieces
Tempered Glass
Automobile coating that provides shine and fade resistance
clear coat
Cortex
region of hair located outside the medulla that contains molecules of pigment
Borosilicate Glass
type of glass used in automobile headlights due to its heat resistance
Basecoat
automobile coating that provides the color
Automobile coating that smooths out imperfections before color is applied
primer
Laminated Glass
type of glass in windshields, is a double layer of glass health together by plastic
microscope used when viewing small specimens with a 40x-1500x magnification
compound
medulla
the central core of a hair
Types of medulla
Interrupted- uneven medulla; Fragmented- even spacing; Continuous- Straight line
stereo microscope
used when viewing small details on larger items; image is only magnified up to 125x but is 3-d and remains right side up
electrocoat
coating that provides corrosion resistance
hair structure that is contained in the follicle
root
as the magnification increases
the field of view decreases
how to find the total magnification of an image
magnification of the ocular lens x power of the objective lens
compound microscope images;
real, inverted, magnified
stereoscope images;
upright, 3D view, only magnified up to 125x
three parts of strand of hair
root, shaft, tip
three parts of hair shaft
medulla, cortex, cuticle
what features of animal hair makes it distinguishable
animals have larger and more unique medulla pattern
anagen
when your hair grows and forms a new shaft
catagen
hair grows very slowly
telogen
rest stage and then falls out
where will you find the best source of DNA in hair?
the root
how is soil prepared for analysis
dried, the color changes and it kills anything in it
characteristics of natural fiber being burnt
ash is soft, and odor is like paper
characteristics of animal fibers being burnt
self extinguishing, smells like burnt hair, black hollow bead, curls away from flame
best way to find out if two fabrics share an origin?
piece it together
composition of paint
pigment, solvent, binder
4 paint layers
electro coat, primer, base coat, clear coat.
electro coat primer
provide corrosion resistance
primer surfacer
smooths out imperfections
base coat
color
clear coat
improves durability and appearance
scalp hair
consistent diameter, uniform distribution of color
pubic hair
short, curly, wide range diameter, continuous medulla
beard hair
triangular shape, coarse, blunt tips
