Definitions of Terms Used

Ultraviolet light is a form of radiation which is not visible to the human eye. It’s in an invisible part of the “electromagnetic spectrum”.

The range of wavelengths or frequencies over which electromagnetic radiation extends.

Energy having both the form of electromagnetic waves and the form of a stream of photons and traveling at the speed of light in a vacuum. The entire range of frequencies and wavelengths of electromagnetic radiation makes up the electromagnetic spectrum.

(di-, “two” + -mer, “parts”) is an oligomer consisting of two monomers joined by bonds that can be either strong or weak, covalent or intermolecular.

Pyrimidine dimer is an intrastrand DNA cross-link, induced by exposure to ultraviolet light (sunlight). Two types of dimers are formed, depending on whether DNA is single-stranded or duplex. Pyrimidine dimers block both DNA replication and transcription and have to be removed to return DNA to its functional state.

Cyclobutane pyrimidine dimers are the major lesions produced upon exposure of DNA to UVB light. They arise from a [2+2] cycloaddition of the C5–C6 double bonds of adjacent pyrimidines

The distance between the top of one wave and the identical phase of the succeeding one in the advance of waves of radiant energy.

Joules per Square Centimeter

1. The International System unit of electrical, mechanical, and thermal energy.

a. A unit of electrical energy equal to the work done when a current of one ampere is passed through a resistance of one ohm for one second.

b. A unit of energy equal to the work done when a force of one newton acts through a distance of one meter.

The SI unit of electrical resistance, equal to the resistance of a conductor through which a current of one ampere flows given a one-volt potential across the conductor. (Units) the derived SI unit of electrical resistance; the resistance between two points on a conductor when a constant potential difference of 1 volt between them produces a current of 1 ampere. Symbol: Ω

(Units) any of the units adopted for international use under the Systèm International d’Unités, now employed for all scientific and most technical purposes. There are seven fundamental units: the metre, kilogram, second, ampere, kelvin, candela, and mole; and two supplementary units: the radian and the steradian. All other units are derived by multiplication or division of these units without the use of numerical factors.

High intensity light that is emitted (as by a xenon flashtube) in a series of flashes of brief duration.

The part of the electromagnetic spectrum with a longer wavelength than light but a shorter wavelength than radio waves; radiation with wavelength between 0.8 micrometres and 1 millimetre.

To make free from live bacteria or other microorganisms.

One billionth (10-9) of a meter.

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