Biological evidence 0.0 / 5 ? CriminologyForensic StudiesUniversityOther Created by: AshleeCreated on: 04-05-15 19:15 What are the 4 main components of blood? WBC's, RBC's, platelets, plasma 1 of 32 What do white blood cells do? Immune system - fight infection 2 of 32 What do red blood cells do? Haemoglobin carries oxygen; carries blood type antigens 3 of 32 What do platelets do? Helps blood to clot 4 of 32 What are the components of plasma? Hormones; waste; antibodies 5 of 32 What is plasma called when fibrinogen is removed? Serum 6 of 32 What presumptives tests can you do for blood? Hemastix; oxidation reactions; Kastle Meyer Test (KM) and Leucomalachite green (LMG) 7 of 32 What happens with a Leucomalachite green test? When the reagent added to hydrogen peroxide it turns blue/green if positive 8 of 32 What happens with a Kastle Meyer test? Chemicals react and if positive it turns pink 9 of 32 What may happen with presumptive tests? False positives - further tests required 10 of 32 What are the advantages of presumptive tests? Cheap and quick 11 of 32 How would you visually identify biological evidence? Colour; texture; light sources 12 of 32 What different light sources could you use to identify biological evidence? Fixed wavelenght light source; UV light; strong light source; laser 13 of 32 What is saliva? Fluid excreted from salivary glands 14 of 32 What does saliva consist of? Salivary amylase (digestive starch) and mucin (lubricates food) 15 of 32 Why is saliva potentially important? It can contain skin cells from inside the mouth 16 of 32 What presumptive tests would you do for saliva? Starch test - add iodine and if it turns blue there is a positive result 17 of 32 What is semen? A suspension of spermatazoa cells 18 of 32 What components make up semen? Calcium, zinc, sodium and citric acid 19 of 32 Where would you look for DNA in semen? The head of the sperm 20 of 32 What presumptive tests would you do for semen? Acid phosphate test and UV light 21 of 32 Why would you use UV light on semen? It fluoresces 22 of 32 What happens with an acid phosphate test? Acid phosphatase is secreted by prostate gland; if semen is present when mixed with a dye and sodium it will turn that colour 23 of 32 What is the viscosity of blood? 3-4 mP.s-1 24 of 32 What is the density of blood? 1060 kg/m3 25 of 32 What is the surface tension of blood? 0.058 N.m-1 26 of 32 What is bloodspatter analysis? The interpretation of dispersion, shape, volume, number and relationship of bloodstains to reconstruct events 27 of 32 What are 3 types of bloodstain? Passive; active and transfer 28 of 32 What are passive bloodstains? Blood stains formed by the force of gravity 29 of 32 What are different types of active blood stain? Gun shot/high velocity; body/artery/cough; movement; cast off 30 of 32 What are transfer bloodstains? Objects that leave a mark/silhuette; footwear/fingermark; direct contatct with contaminated objects 31 of 32 What are the most important aspects to consider when interpreting bloodspatter? Angle; location; size; volume; outer ring; dispersion 32 of 32
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