Hair - Weebly

Hair - Weebly

Hair Hair Analysis Can be used to match a suspect with a crime scene Can be microscopically analyzed for similarity

Comparisons continue to improve as forensic techniques improve Part 1 Hair Background Grows from a collection of cells called a follicle

The hair shaft is composed of three parts: 1. cuticle outside covering of hair shaft, can look like overlapping roof shingles 2. Cortex inside the

cuticle, a pigmented layer 3. Medulla runs down the center of the hair Hair texture can

vary considerably depending upon the ratio of cuticle to The Structure of Hair The Structure of Hair

Cross-Sections Hair can vary in shape, length, diameter, texture, and color. The cross-sections can be circular, triangular, irregular, or flattened,

which influences the curl of the hair. Dog layers can have one fine coat and one coarse coat. Color Depends

granules. on distribution of pigment Hair from Different Parts of the Body Head Hair

Eyebrows/Eye Lashes Beard and Mustache Hair

Underarm Hair Auxiliary or Body Hair

Pubic Hair HEAD HAIR Cross-Section is circular or elliptical EYEBROW HAIR Cross-Section

ends is circular, but has tapering BEARD HAIR Beard: Thick and Triangular CrossSection

BODY HAIR and PUBIC HAIR Oval or Triangle, depending on the shaving routines of individual. HAIR GROWTH

Antagen Stage Catagen Stage

80-90% of all hair. Active growth around follicle. Hair changes (Turning Grey) Telogen Stage

Hair follicle is dormant or resting and hairs easily fall out. TREATED HAIR Bleaching When removes pigment granule.

hair is dyed, the hair shaft (Cuticle and Cortex) changes color. Racial Differences Animal Hair Ovoid

Bodies- clumps of pigment Animal hair can change color abruptly MICROSCOPY

Length, color, curliness Pattern of Medulla Florescence of Dyes

TESTING FOR SUBSTANCES Lead, Arsenic, Drugs Organic solvent breaks down hair over time.

Scientists can often develop a timeline. If hair is forcibly removed, it has follicular tag. DNA Testing.

Recently Viewed Presentations

  • 22 February Todays Bell Ringer Evolution Define these

    22 February Todays Bell Ringer Evolution Define these

    Please define these words: Fossils. Molecular & genetic evidence (pg 317) Biogeography. Embryology. Homologous structures. ... Eukaryotic cells may have evolved through endosymbiosis. Endosymbiosis is a relationship in which one organism lives within the body of another.
  • A Short History of the Birth & Growth of the American Office

    A Short History of the Birth & Growth of the American Office

    A Short History of the Birth & Growth of the American Office. ... Whereas it was once important to have impressive offices--which was often intended to inspire confidence in a company's prestige and "staying power" the current trend is toward...
  • Machine-Level Programming I: Basics 15-213/18-213: Introduction to Computer

    Machine-Level Programming I: Basics 15-213/18-213: Introduction to Computer

    x86 Clones: Advanced Micro Devices (AMD) Historically. AMD has followed just behind Intel. A little bit slower, a lot cheaper. Then. Recruited top circuit designers from Digital Equipment Corp. and other downward trending companies
  • EECS 110: Lec 11: Indefinite Loops and Program

    EECS 110: Lec 11: Indefinite Loops and Program

    Hint: use a NESTED loop * * * * * * Final Exam When: Wednesday 6/6/18 Where: Frances Searle Building 1441 Time: 9:30AM - 11:30AM Python and images for creating and saving images import bmp.py image = BitMap( 300, 200,...
  • La flogosi allergica e le infezioni nel bambino

    La flogosi allergica e le infezioni nel bambino

    Mild RI involved the rhinopharynx (rhinitis, rhinopharyngitis with possible involvement of tonsils), and/or the larynx. Severe RI involved the middle ear, the lower airways, or the paranasal sinuses. allergia e infezioni, responsabile di un inizio piĆ¹ precoce della sintomatologia e...
  • Year 10 Parent Information Evening Wednesday 29th July

    Year 10 Parent Information Evening Wednesday 29th July

    Victoria Certificate of Applied Learning. VETis - Vocational Education & Training in School. Respect. Resilience. Responsibility. Independence. Success. Structure of the Victorian Certificate of Education (VCE) Usually completed over 2 years.
  • SPIDERS!!

    SPIDERS!!

    The life cycle of a spider . Spiders come from eggs: A tarantula can lay hundreds of eggs. She wraps them up in a ball of silk, using spinnerets at the rear of her body. These are called egg sacs....
  • Generation Gaps - Metropolitan State University of Denver

    Generation Gaps - Metropolitan State University of Denver

    Generations Today. For the first time, there are four different generations working together in the workforce. This assists in creating an environment of collaboration and innovation.