December 6, 2012 STANDARD: SFS2b-Analyze the morphology and

December 6, 2012 STANDARD: SFS2b-Analyze the morphology and

December 6, 2012 STANDARD: SFS2b-Analyze the morphology and types of hair, fibers, soil and glass. EQ: What is the structure of hair fiber? Read the case study on pg363 (blue book), pg 420 (orange), and write and answer the following questions. 1. What happened to the Central Park Jogger? 2. What evidence caused the boys to be convicted? 3. What eventually happened to the boys and what caused

that decision to be made? NOVEMBER 16, 2012 WARM-UP: Please copy this list on a separate sheet of paper (do not write in your comp book). This is not the complete list. HAIR, FIBER, & GLASS NOTEBOOK CHECK: 1. 2. 3. 4.

5. 6. Ch 3 Reading Guide Banana Autopsy Unit 2a Vocabulary Ch 3 Chapter Review (1-20) Physical Evidence Activity Hair Questions Chapter 10

Examination of Trace Evidence: Hair Microscopic Evidence and Its Analysis - HAIRS - Most frequently found evidence at the scene of a violent crime - Can provide link between criminal, victim, and crime scene - From hair, one can determine: 1. Human or Animal

2. Race 3. Origin 4. Manner of removal 5. Treated hair 6. Drugs ingested Microscopic Evidence and Its Analysis - HAIRS - Hair Morphology

- Shaft: sticks out of the skin - Root: below epidermis - Follicle: structure from which it grows Microscopic Evidence and Its Analysis - HAIRS

- Hair Morphology - Medulla - Cortex - Cuticle Two features that make hair a good subject for

identification: 1. Resistance to chemical decompostion 2. Ability to retain features for a long time Microscopic Evidence and Its Analysis - HAIRS

- Hair Morphology - CUTICLE - Formed by overlapping scales that always point toward the tip end of each hair Microscopic Evidence and Its Analysis - HAIRS

- Hair Morphology Ca t Petal Imbricate Hu

ma n Mosaic g o D Microscopic Evidence and Its Analysis - HAIRS

- Hair Morphology - CUTICLE - Scale variations dependent on species Mosaic Pectinate Imbricate

Petal Diamond Petal Chevron Microscopic Evidence and Its Analysis - HAIRS - Hair Morphology

Pectinate M ou se Diamond Petal Northern Fur Seal t

i b b a R Chevron Cuticle Visualization 1. Scanning electron microscope 2. Make a cast of its

surface using clear nail polish or softened vinyl Hair Structure Hair is composed of three principal parts: Cuticle outer coating composed of overlapping scales Cortex protein-rich structure around the medulla that contains pigment

Medulla central core (may be absent) The structure of hair has been compared to that of a pencil with the medulla being the lead, the cortex being the wood and the cuticle being the paint on the outside. http://library.thinkquest.org/04oct/00206/lesson.htm#t_hair Microscopic Evidence and Its Analysis - CORTEX -

- Middle layer, made of spindle-shaped cells (keratin) aligned in a regular array, parallel to the length of the hair, consisting of: Melanin: pigment granules that give hair its color - Points of forensic comparison color, size, shape, distribution MEDULLARY INDEX Measure the diameter of the medulla relative to the diameter of the hair shaft:

Humans= <1/3 Other Animals= or > Microscopic Evidence and Its Analysis - canal-like, innermost layer of cells, variety of types and patterns - MEDULLA - 4 Types 1. Continuous: most animals, seldom humans 2. Interrupted (Discontinuous): human pubic hair, sometimes head hair and animal hair 3. Fragmented: mostly human hair

4. Absent: human hair 4-2-1 4 Words that summarize 2 1 Microscopic Evidence and Its Analysis - HAIRS

- Hair Morphology - MEDULLA - 5 Patterns 1. Amorphous: no specific pattern 2. Uniserial: small blocks in a row 3. Multiserial: several rows of blocks across 4. Vacuolated: uneven pattern

5. Lattice: circular patterns THREE GROWTH PHASES OF THE ROOT: 1. Anagen- initial growth (follicular tagrich source of DNA)-flame shaped 2. Catagen- transition stage (elongated) 3. Telogen- final growth (club-shaped) Microscopic Evidence and Its Analysis

3 FEATURES IMPORTANT FOR HAIR ID: 1. Scale structure 2. Medullary index 3. Medullary shape 7 characteristics that interest Criminalists: 1. 2. 3. 4.

5. 6. 7. Matching color Length Diameter Presence or absence of medulla Distribution Shape Color intensity of pigment granules

How fast does hair grow on average? 1cm per month Infections Chemicals

DNA ANALYSIS COMPARISON MICROSCOPE A.Race B.Drugs C.Place D.Color

A.Shaft B.Medulla C.Cuticle D.Follicle A.Medulla B.Cuticle C.Follicle D.Cortex A.Comparison

B.Scanning C.Light D.Transmission A.Continuous B.Anagenic C.Fragmented D.None of the above A.Cortex

B.Cuticle C.Medulla D.Medullary Index A.Anagen B.Catagen C.Metagen D.Telogen A. Cuticle index B. Scale structure

C. Medullary index D. Medullary shape A. Matching the color B. DNA Analysis C. Studying pigment granules D. Measuring the medullary index A. B.

C. D. 1 cm 2 cm .1 cm .2 cm Microscopic Evidence and Its Analysis - Root Characteristics: Removal

Pulled Forcibly removed Shed - Tip Characteristics Burned Cut

Razored Split Can you identify the animal hairs shown? A B

C D G E F H

Think About It (1) In which samples are we viewing the cuticle? How do they compare? (2) In which samples are we viewing the medulla? How do they compare? (3) What characteristics can be used to identify hair samples? I Can you identify the types of fibers shown? A

B D Think About It (1) Which samples are natural fibers? (2) Which samples are synthetic fibers? (3) What characteristics can be used to identify fiber samples? C E

F Answer Keys http://micro.magnet.fsu.edu/primer/techniques/polarized/gallery/images/humansmall.jpg Types of Animal Hairs - Key A Cat

B Horse C Pig D

Human G E Deer F Dog

Rabbit H Rat I Human Types of Fibers - Key

A Acrylic Yarn Polyester Yarn B D

Cotton Yarn Rayon Rope C E Nylon Rope Wool Yarn

F

Recently Viewed Presentations

  • Zoology Portfolio - Hulse&#x27;s Class

    Zoology Portfolio - Hulse's Class

    Eukaryote. Minimum of 3 key characteristics. Minimum of 1 visual element. What is the key evolution change from the previous phylum? Why is this adaptation or are these adaptations beneficial to the overall survival of the organism?
  • Immune System - 1 - Perkins Science

    Immune System - 1 - Perkins Science

    clonal . anergy, these lymphocytes are . prevented from becoming active. Regulatory T lymphocytes likely do this. Immunological Tolerance (cont.) Passive Immunity. Passing of antibodies from one individual to another; person does not make their own antibodies.
  • THE verb - Mrs. Phan

    THE verb - Mrs. Phan

    Verb - words that name actions. Dance, laugh, shout, sing. Every complete sentence needs a verb "State of being" verbs . Not every verb describes an action. Some express a state of being. Charlotte is a fast runner. Emile ....
  • High Performance Liquid Chromatography (HPLC)

    High Performance Liquid Chromatography (HPLC)

    High Performance Liquid Chromatography (HPLC) Pn. Suryati Bt. Syafri 2009 Learning Outcome After studying this topic student should be able to : Define HPLC Describe HPLC principle Explain major components of HPLC and their function Explain application of HPLC Explain...
  • How Applications Use Persistent Memory

    How Applications Use Persistent Memory

    The goal of our analysis was to facilitate better system support for persistent memory and to achieve it we assembled a benchmark suite for persistent memory, called whisper which stands for wisconsin-hp labs suite for persistence. Through extensive analysis, we...
  • Supporting Grieving Students in Schools: Training Module - 2

    Supporting Grieving Students in Schools: Training Module - 2

    Supporting Grieving Students in Schools: Training Module - 2. This "Supporting Grieving Students in Schools" training was divided into three sections or modules so that this education program can be taught in three separate presentations.
  • Lecture 13: Intro to Machine Learning

    Lecture 13: Intro to Machine Learning

    Get the contents by calling cudnnGetTensor4dDescriptor( cudnnTensorDescriptor_tdesc,cudnnDataType_tdataType,int *n, int *c, int *h, int *w,int *nStr, int *cStr, int *hStr, int *wStr) Standard trick of returning by setting output parameters. Don't worry about the strides nStr, cStr, hStr, wStr
  • Peralatan dan Perkembangan TIK - Weebly

    Peralatan dan Perkembangan TIK - Weebly

    Paul Nipkow pada tahun 1883. HP (Handphone) salah satuteknologi komunikasi yang saat ini sangat marak di gunakan oleh masyarakat yang dikenal mulai . April 1973. Komputer digital . ditemukan oleh . Howard Hathaway Aiken . ahli Matematika warganegara Amerika Serikat....