Question: How Is Spectroscopy Used In Forensic Science?

What is the principle of chromatography?

Chromatography is based on the principle where molecules in mixture applied onto the surface or into the solid, and fluid stationary phase (stable phase) is separating from each other while moving with the aid of a mobile phase..

What is UV spectroscopy used for in forensics?

The use of UV/visible spectroscopy has been recommended for forensic applications. UV/visible spectroscopy plays a key role in examining inks and fibers. The UV/visible spectrum directly quantifies the color of the sample and the technique is reliable and simple to carry out experimentally.

What are the 4 main natural Fibres?

Of industrial value are four animal fibers, wool, silk, camel hair, and angora as well as four plant fibers, cotton, flax, hemp, and jute. Dominant in terms of scale of production and use is cotton for textiles.

What are the applications of spectrophotometry?

Spectrophotometers are widely used in various disciplines such as physics, molecular biology, chemistry and biochemistry. Applications for specs include measurement of substance concentration such as protein, DNA or RNA, growth of bacterial cells, and enzymatic reactions.

Is UV VIS destructive?

The UV/vis spectrum directly quantifies the colour of the sample and the technique is reliable and fairly straightforward to carry out experimentally. Conventional UV/vis spectroscopy is destructive, though only very small quantities of material may be required.

What are two types of fibers?

There are 2 different types of fiber — soluble and insoluble. Both are important for health, digestion, and preventing diseases. Soluble fiber attracts water and turns to gel during digestion. This slows digestion.

What are two specific tasks of a forensic odontologist?

Identify human remains that cannot be identified using face recognition, fingerprints or other means. Identify bodies in mass fatalities, such as plane crashes and natural disasters. Determine the source of bite mark injuries, in cases of assault or suspected abuse. Estimate the age of skeletal remains.

How are fibers used in forensic science?

As discussed previously, fibers are considered a form of trace evidence that can be transferred from the clothing of a suspect to the clothing of a victim during the commission of a crime. Fibers can also transfer from a fabric source such as a carpet, bed, or furniture at a crime scene.

What are 5 synthetic fibers?

Specialty synthetic fibers include:Rayon (1894) artificial silk.Vinyon (1939)Saran (1941)Spandex (1959)Vinalon (1939)Aramids (1961) – known as Nomex, Kevlar and Twaron.Modal (1960’s)Dyneema/Spectra (1979)More items…

Which is man made Fibre?

Manmade fibres are made from various chemicals, or are regenerated from plant fibres. Examples of manmade fibres are: polyester; polyamide – (nylon); acrylics; viscose, made from wood bark; Kevlar, a high-performance fibre; and Nomex, a high-performance fibre.

What is the strongest natural fiber in the world?

Spider silkSpider silk is famous for its amazing toughness, and until recently a tensile strength of 1.3 gigapascals (GPa) was enough to earn it the title of strongest natural material.

What are the 4 types of chromatography?

There are four main types of chromatography. These are Liquid Chromatography, Gas Chromatography, Thin-Layer Chromatography and Paper Chromatography. Liquid Chromatography is used in the world to test water samples to look for pollution in lakes and rivers.

How is chromatography used in forensic science?

Forensic scientists are able to use ink chromatography to solve crimes by matching documents or stains found at a crime scene to the marker or pen that belongs to a suspect. Forensic scientists analyze the unknown ink and compare it to writing utensils collected from possible suspects.

What are the 4 types of fibers?

Soluble fibers include gums, pectins, psyllium, beta-glucans and others. Insoluble fibers include lignin and cellulose. Different plant foods have varying proportions of soluble and insoluble fibers.

What are the 3 types of Fibre?

Types of fibre in foodsoluble fibre – includes pectins, gums and mucilage, which are found mainly in plant cells. One of its major roles is to lower LDL (bad) cholesterol levels. … insoluble fibre – includes cellulose, hemicelluloses and lignin, which make up the structural parts of plant cell walls.

What are the three types of fibers?

The three types of connective tissue fibers are:Collagen fibers – most are type I collagen (most abundant protein in the body)Elastic fibers – contain elastin and fibrillin.Reticular fibers – contain type III collagen.