Add a description that highlights the unique characteristics of each hair and fiber sample. A fiber can be spun with other fibers to form a yarn that can be woven or knitted to form a fabric. Students will be allowed to use their sketches only to identify hairs through the microscope. Clothing and the victim's clothing dramatically increases the likelihood that these. Students will learn about hair and fiber evidence through hair scale lab, hair microscopy lab, and fiber examination lab. Cross-section of a. man-made fiber.
Hair is composed of three principal parts: Cuticle – outer coating composed of overlapping scales. Hair And Fiber Evidence Worksheet Answer Key is not the form you're looking for? • Distribution of the cortex is perhaps the most important component.
Name: Hair and fiber analysis. Microscope Review Activty (both scopes). Characteristics of the cuticle may be important in distinguishing between hairs of different species but are often not useful in distinguishing between different people. Two individuals had physical contact. About Video Sitemap - Page 1 - Do More. Types of Medulla: Continuous-Interrupted-Fragmented. • It may also be absent in some species. Hair Analysis Lab (Finish TE Lab). The discovery of cross transfers and multiple fiber transfers between the suspect's clothing and the victim's clothing dramatically increases the likelihood that these two individuals had physical contact.
The physical appearance of hair can be affected by nutritional status and intentional alteration (heat curling, perms, straightening, etc. ) Reading comprehension - ensure that you draw the most important details from the lesson on fibers as evidence in forensics. Medulla: Forensics Can Differentiate the Species of the Hair The well trained forensic microscope technician can easily tell if a trace evidence hair at a crime scene belongs to a human or a rat, cat or bear! HW:Online text page 63-64 11-19, copy/paste into OneNote, FS project proposal Day 10I will identify the different types of fibers. Trace Evidence Review: Glass Lab - Please Print.
Common wool fibers originate from sheep. Forensic Science media Write the name of the hair or fiber on the line and then draw what you see under medium or high An observation worksheet is available on my website which requires students to draw an image of what they see and add a description that highlights unique... Doc Retrieval. Write the name of the hair or fiber on the. 8 Friday 4/12/19I will idenity how different fabrics are weaved together. Vocabulary: Cuticle Cortex Medulla Anagen phase spectrometry and the benefits of each in forensic drug analysis. Go to Forensic Serology. Return/review QD test.
Complete take home quiz: 't Print. Characteristics of the cuticle may be important in distinguishing. Think About It … Which samples are natural fibers? 6 years Catagen Phase – a transition phase where the root bulb starts getting pushed out of the follicle: lasts 3 weeks. • Whether or not it contains pigment. Purpose of using a polarizing light microscope in fiber analysis. Trace Evidence - Miss Stanley Cyber Classroom. However, hair strands often have little to no hair protein.
These factors may be caused by genes that regulate, or by. Probability and Hair Analysis. A long, dark hair caught on pliers was found in the same fertilizer warehouse where Scott, Using the Gale Forensic Science eCollection at cengage. Follicles during fetal development, and no new follicles are produced after birth. I am a high school forensic science teacher and everything that I create for my class will end up in this bundle. SOUTH POINTE HIGH SCHOOL.
Although most product placements appear in television shows and movies. Can be woven or knitted to form a fabric. The cuticle varies in: • Its scales, How many there are per centimeter, How much they overlap, Their overall shape, and. The medulla that contains pigment.
Where else do these engines leak oil? Good compression but failed leak down world. 13) Also the first reading and the final readings should not be too far. However this will cause your engine to be out of time. Should we take this apart and put new rings in the engine or do you think it would be okay to run it as it is? If the mechanical timing was off, it would most likely be on the exhaust cam since the air was leaking out of exhaust manifold?
Tools you will need: 1. With these better than expected results, I'm confident going through with the build of my "EDirty6". 09-26-2015 07:44 PM. Although a compression tester alone won't give you a detailed picture of your engine's health, it can (and should) be used first if there is any reason to believe that a problem might exist. You can perform a leak-down test with the piston at bottom dead center. I think this is at least partially why Reher made that statement. But, understandably, he has a desire to get behind the wheel of his own track car this season. Here is a list of what to listen for: Air escaping out the PCV, road draft tube, oil dipstick, or oil cap: indicates that the piston rings in that cylinder are worn and pressure is getting past them, or that the cylinder itself is scored or damaged. Parts List Miniature air pressure regulator. Scored cylinder walls. Good compression but failed leak down fiber plus. I disconnected the hose at the passenger side of the valve cover and there is some oil seeping into it (should there only be vapor? After finding a mouse nest in my air cleaner a second time I installed wire mesh over the intake. But don't give up on the compression tester just yet, read on!
You mention that this was an engine that had just come from the junkyard where it might have been sitting for a year or so. 1995 Arctic Silver ///M3 3. You will get so much pressure built up on the first revolution, but this will not be the complete pressure. I use this as the cue that the cylinder went through one full revolution. Whistling through both. I double checked the timing, cam, valve lash and all was good. And I followed the proper procedure on zeroing the leakdown tester, so that's all good. Killer B Motorsport oil pickup and windage tray. No major failures... Oil on spark plugs but leak down test is good, what next. gotta be a slipped timing belt right?
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