The principle of electrophoresis states that in the presence of an electric field, a charged particle moves toward the region of an opposite charge. When the particle has unequal charge distribution in its chemical bonds, it aligns on the electric potential.Know More
An electrode is any conducting material that creates an electrical field to allow current to pass through. The positive end of an electrode is called an anode while the negative end is called a cathode. When a negatively charged particle travels along an electric field, it tends to migrate toward the anode and move against frictional force. The bigger the particle, the slower it moves.
In the fields of molecular biology and biochemistry, electrophoresis is a useful analytical technique where macromolecules of varying sizes and densities are separated. Complex proteins and nucleic acids that undergo electrophoresis move through a gel matrix that is primarily composed of polymerized agarose or polyacrylamide. Agarose is a polysaccharide that forms a gelatin-like substance when dissolved in boiling water. Polyacrylamide is a type of solid gel created by polymerization of acrylamide solutions through the addition of ammonium persulfate coupled with tetramethylenediamine.
Agarose gel is mainly used for separating complex protein molecules and DNA or RNA fragments. Larger molecules get trapped against the porous material while smaller particles pass through easily. Modern researchers prefer the use of polyacrylamide gel. Other forms of gel electrophoresis include isoelectric focusing, 2D electrophoresis, capillary electrophoresis and western blotting.Learn more about Chemistry
Phenolphthalein, an acid-base indicator used to test the pH of a solution, turns pink due to the presence of a weak base. The indicator itself is a weak, colorless acid that forms pink anions when it dissolves in water.Full Answer >
Arsenic occurs naturally in the environment and is often found within the Earth's crust, extending its presence into soil, water and rock. Arsenic is also forced into the air during certain chemical processes, causing environmental contamination. Arsenic is a poisonous substance, classified as a metalloid.Full Answer >
Colored ions indicate the presence of a transition metal. Transition metals display colors because of their incompletely filled d orbitals. As the transition metal absorbs a particular wavelength of light to raise the electron orbital, it causes the light that passes through the solution to emit a color.Full Answer >
The element radon is commonly used in Geiger counters to detect the presence of radiation leaking from an object or site. Radon was once prevalently used in the treatment of cancer because it kills cancer cells, but is only used in some cases, as of 2015.Full Answer >