Forensc chap4test 11

Question Answer
What are fibers used for? To create a link between crime and a suspect for the crime
What do forensic scientists do? Look for fibers to find out where a suspect has been and who they have been in contact with
What kind of evidence are fibers? Class and trace evidence
What is direct transfer? When fibers are transferred directly from victim to suspect or directly from suspect to victim
What is indirect transfer? Fibers can be transferred indirectly in which a person picks up fibers from an area then went somewhere else and left those fibers there
What kind of fibers are examined at a crime scene? Only fibers a forensic scientist would not expect to find at the crime scene
How is the value of a fiber determined? The value of a fiber is based on how common the material it is made of is
What do forensic scientists look for in an investigation? The type of fiber, fiber color, number of fibers found, where the fiber was found, the textile the fiber came from, if the fiber was transferred multiple times, the type of crime committed, the time between the crime and discovery of the fiber
How is fiber evidence gathered? Using special vacuums, sticky tape, and forceps
Why is being accurate while recording fibers important? If evidence is inaccurate, then it will not be admissible in court
What is polarizing light microscopy? A procedure that uses a microscope with a special filter to allow the scientists to look at fiber using wavelengths
Infrared microscopes emit a beam that can tell a forensic scientist what? What does this information do? Details about the chemicals structure of fiber making it easy to tell the difference between fibers that look similar
What is the most common form of fiber transfer that occurs at a crime scene? The shedding of a textile. Textiles include clothing carpets and upholstery
How are fibers classified? Why is identifying the type of fiber being worked with important? Natural fibers or synthetic fibers. Fibers can reveal important information about the suspect and the environment they were in
Where do natural fibers come from? Animals, plants, and minerals
What are animal fibers made up of? Where do animal fibers come from? Made up of protein and come from hair fur and webbing
Where is silk collected from and what is it? Cocoons of the caterpillar Bombyx mori. Another type of natural fiber
What produces natural fibers? Seeds, fruit, stems, and leaves
What are plant fibers made of? Polymer cellulose (is also glucose)
What is cellulose? Simple glucose units
Does cellulose dissolve in water? No is does not dissolve in water
Where are hemp, jute and flax produced from? How does hemp, jute and flax grow? The thick region of plant stems and grow in bundles
What is the most common stem fiber and where is it found? Flax. Flax is found in textile linen
Why is linen unique? It is highly crystalline and is a dense strong fiber that resists rot and light damage
What is jute used to make? Rope, mats, and handbags
What is hemp used to make? Clothes in Asia is a popular alternative to cotton
What is one mineral fiber? Where is the mineral fiber found? Asbestos. Asbestos is found in different types of rocks with a crystalline structure composed of long thin fibers
What are regenerated fibers and modified fibers derived from? Where do they originate? Cellulose. Plants.
What are synthetic polymer fibers and where do they originate? Originate with Petroleum products. Are non cellulose based fibers
What is polyester? A common synthetic fiber found in polar fleece, wrinkle resistant pants and is added to natural fibers to increase strength
Are synthetic fibers stronger or weaker than natural fibers? Stronger
Are synthetic fibers damaged by microorganisms? no they are not
Do synthetic fibers deteriorate in bright sunlight and melt at a lower temperature than natural fibers? Yes they do
What is a thread count? The number of threads that are packed together for any amount of given fabric
What increases the price of products? High thread counts, and all natural material
What are yarns? Fibers too raw in their raw state in be used to make textiles.
What are yarns made of? Fibers like wool and polyester, which gives the yarn qualities desired such as strength or wrinkle resistance
How are fibers woven into textiles and fabrics? Using the warp, the weft, and the weave threads
What is a way that fabrics are different? Thread count, number of threads per square inch

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