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A germicidal lamp (also known as disinfection lamp or sterilizer lamp) is an electric light that produces ultraviolet C (UVC) light. This short-wave ultraviolet light disrupts DNA base pairing , causing formation of pyrimidine dimers , and leads to the inactivation of bacteria , viruses , and protozoans .
A 175-watt mercury-vapor light approximately 15 seconds after starting.A closeup of a 175-W mercury-vapor lamp.The small diagonal cylinder at the bottom of the arc tube is a resistor which supplies current to the starter electrode.
Ultraviolet germicidal irradiation (UVGI) is a disinfection technique employing ultraviolet (UV) light, particularly UV-C (180–280 nm), to kill or inactivate microorganisms. UVGI primarily inactivates microbes by damaging their genetic material, thereby inhibiting their capacity to carry out vital functions.
Hexachlorophene, also known as Nabac, is an organochlorine compound that was once widely used as a disinfectant.The compound occurs as a white odorless solid, although commercial samples can be off-white and possess a slightly phenolic odor.
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Unfiltered light from a high-pressure lamp is rich in UVC used in germicidal lamps, for water purification, but it damages human skin. The contents of a high-pressure lamp are inert gas (such as argon) and mercury. [2] There are no phosphors used, and the mercury is clearly visible if it is not in a gaseous state.
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