Microscopic Evidence HAIR EVIDENCE FIBER ANALYSIS PATHOLOGY INTRO
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1 Microscopic Evidence HAIR EVIDENCE FIBER ANALYSIS PATHOLOGY INTRO
2 Microscopic Hair Analysis The first step in microscopic hair evaluation is to determine whether it is animal or human. Hair (and nails) is made up of a protein called keratin, color and trace minerals. A see through outer covering called the cuticle is composed of overlapping scales which can be seen under the microscope. The pattern and shape of the scales help to identify the type of animal or human from which the hair originated. Human and animal hairs differ on several physical characteristics including
3 Hair follicle= in dermis under skin Hair shaft= the part we can see
4 Hair Analysis consistent pigmentation of the hair in humans a regularly defined cellular core in animals a club shaped root in humans with variable shapes in animals animal coats contain several different types of hairs while humans do not
5 Once the hair is identified as human, human characteristics are determined which include: race body region from which the hair was found length color whether the hair was removed forcibly from the body damage due to crushing or burning chemical treatment such as dyes or bleach
6 Racial Variations Racial variations include the diameter of the hair shaft, density and distribution of pigment granules and shape of the hair in cross section. Body hair is differentiated based on length, shaft diameter, texture and condition of the tips. Comparing all of these characteristics allows a forensic technician to determine if hair found at a crime scene matches that of a suspect or victim.
7 Hair Shaft Layers 1. CUTICLE outside layers that has scales 2. Cortex middle layer keratin bundles 3. Medulla Central canal running through hair= inner layer has 3 basic patterns
8 OVERLAPPING SCALES KERATINIZED FLATTENED CUTICLE Most resistant to chemical decomposition is the cuticle The SCALE PATTERN is most important in identifying type of species.
9 MEDULLA CENTRAL CANAL PATTERNS CONTINUOUS INTERRUPTED FRAGMENTED SHAPE
10 MEDULLARY INDEX MEDULLA/HAIR SHAFT DIAMETERS HUMANS <1/3
11 HAIR COMPARISON CAT DOG ORANGUTAN RAT
12
13 Hair Samples
14 What is hair used for? Unless it is burnt, hair is extremely durable. It remains identifiable on bodies in an advanced state of decomposition or attached to a murder weapon long after the crime is committed. Hair is composed of protein substances, chiefly keratin, and head hair grows at an average weekly rate of about 2.5mm, the beard growing faster and body hair more slowly. Growth ceases at death, but as the skin shrinks the hair, especially the beard, becomes more prominent, giving rise to the murder myth that hair grows after death. The absorbent property of hair makes its examination important in cases of arsenic poisoning. Hair picks up the poisons from the bloodstream, and it is possible to work out the approximate strength and frequency of the dosage by analysis.
15 What type of hair is CASHMERE made from?
16 What type of hair is CASHMERE made from? GOAT There is a breed of goat called cashmere. Most raw cashmere comes from China.
17 FIBER ANALYSIS Cotton Wool Linen Nylon Silk Rayon
18 COTTON Cotton is the most widely used plant fiber. Cotton fibers are the hairs found on the seeds of the cotton plant. If possible, obtain a cotton boll on its stem. Examined under a microscope, the cotton fibers (use a few strands of absorbent cotton) will look like a flattened, irregular, twisted ribbon. Top three distributors: China, India, USA
19 WOOL Wool is the most commonly used animal fiber. The fiber is obtained from the soft, hairy covering of sheep and sometimes goats. Under the microscope, the wool fiber looks like a long cylinder with scales on it. The fiber is very curly and springy. Cloth made from wool includes cashmere, camel's hair, alpaca, covert cloth, flannel, gabardine, mohair, serge, tweed and worsted.
20 LINEN Another common plant fiber is linen, which comes from the flax plant. This fiber is long, lustrous, and smooth. Under the microscope it looks like bamboo can, with jointed cells and split, tapered ends. Point out that linen is often used to make handkerchiefs, tablecloths, napkins, summer clothing, pants and blouses.
21 SILK Silk, another common animal fiber, was once quite popular, but has been replaced to a great extent by such synthetic fibers as Nylon, Orlon, and Dacron. Silk is made by the mulberry silk worm when spinning its cocoon. Under the microscope the silk fiber appears as a thin, long, smooth and lustrous cylinder. Cloths made from silk include brocade, brocatelle, chiffon, crepe, velvet, satin, taffeta, tulle, and falle. Silkworms (China) spin silk like spiders spin a web!
22 RAYON Rayon is one of the first successful artificial fibers. It is made from cellulose. When manufactured, the rayon fibers resemble silk. Under the microscope, the rayon fiber looks like a smooth, lustrous cylinder. Rayon can be made into cloth that is hard to distinguish from silk, cotton, linen, or wool. Celanese is one form of rayon.
23 ASBESTOS Asbestos is the name given to a group of minerals that occur naturally as masses of strong, flexible fibers that can be separated into thin threads and woven to make asbestos cloth. These fibers are not affected by heat or chemicals and do not conduct electricity. Asbestos cloth was used in fireproof theater curtains and protective suits for use by fire fighters. It was also used as a building material, brake pads and a range of other products.
24 ASBESTOS It is now know that the fibers of asbestos are a dangerous irritant. Even exposure to small amounts of asbestos dust can lead to a range of illnesses such as asbestosis, a serious lung inflammation caused by asbestos exposure, and Mesothelioma a cancer of the chest and abdomen. Although asbestos products are rarely made these days, they can still be found, particularly in old buildings.
25 Synthetic Fibers Today there is a wide variety of synthetic fibers; all have trade names such as Nylon, Orlon, Dacron, Vinyon, Aralac, Acrilan, Velon, Dynel, Banlon and Lycra. Like rayon, these fibres resemble silk, and under the microscope look like smooth, lustrous cylinders. Synthetic fibers are easily identified because of their uniform thickness (the thickness of natural fibers varies). Synthetic fibers area made into fabrics that have special properties..
26 Synthetic Fibers Glass and asbestos can also be spun into thread and woven into fabrics. Glass fibers are made by stretching melted glass into fine filaments, which are spun into thread for weaving into cloth. Lightweight glass fibers are used to make long lasting windows curtains, drapes, and lamp shades. Heavier glass fabrics are used to make fireproof theater and school curtains.
27 FORENSIC PATHOLOGY A branch of pathology concerned with determining cause of death by observing tissue, organs, bodily fluids and whole bodies.
28 Sperm Cells Sperm cells move by means of flagella
29 Terms to understand: CANCER the uncontrolled growth of abnormal cells in the body. Carcinoma = cancer Malignant tumor = cancer Benign tumor= not cancerous (moles/ fibroids) Limited growth (does not spread) Does not affect surrounding area Does not metastasize Some types of benign tumors can cause negative health effects or can turn into malignant tumors Metastasis the spread of a disease from one organ or part to another non adjacent organ or part.
30 Example of Metastasis Primary cancer in pancreas which has caused secondary liver tumors
31 CELLS:
32 Normal cells are uniform and arranged in tissues in an orderly manner. When you poke and prod normal tissue, it s soft.
33 Paraganglioma shows polygonal chief cells enclosed by fibrous elongated cells OR Head/Neck Cancer Cells
34 Tumor cells have large, irregular nuclei, a small cytoplasm and large variations in size and shape. The cells are arranged in a disorganized fashion. Ex: Brain Tumor
35 A renal cell carcinoma stained slide
36 Lung Disease Pathology of lung showing centrilobular emphysema characteristic of smoking. Close up of fixed, cut surface shows multiple cavities (aveoli) lined by heavy black carbon deposits.
37 Slides to examine
38 Sketching the Evidence:
-hairs grows out of a follicle (has cells with DNA for analysis) - hair extends from here (in the follicle) has cells with DNA
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