Ultraviolet (UV) light is electromagnetic radiation with a wavelength shorter than that of visible light.
The spectrum consists of electromagnetic waves with frequencies higher than those that humans identify as the colour violet (purple). UV light is typically found as part of the radiation received by the Earth from the Sun. Most humans are aware of the effects of UV through the painful condition of sunburn. UV can be separated into various ranges, with short range UV (UV-C) considered "germicidal UV." At certain wavelengths UV is mutagenic to bacteria, viruses and other micro-organisms. The Ewbank Raycop incorporates UV-C technology. UV-C radiation produced by the tube fitted inside the Raycop emits large amounts of invisible ultraviolet rays of 254nm (nanometers) wave length. This UV-C light is germicidal, it damages the DNA of house dust mites, bacteria, viruses and other pathogens and thus destroys their ability to multiply and cause disease. UV-A, -B and -C radiations cause damage to all living organisms, including bacteria, fungi and insects. UV-C radiation is the most potent of the three types of UV radiation and acts at short range. The DNA is one of the key targets for UV-induced damage Because of its powerful lethal effect and the ease to deliver high doses, UV-C has been used for decades to kill bacteria using germicidal devices. Many studies support the lethal effect of UV-C on bacteria e.g. (Liltved and Landfald, 1993; Macher, 1993; Conner-Kerr et al., 1998), including MRSA (Sheldon et al., 2005) and UV-C can kill 99.9 % of a given bacteria population in seconds using UV-C doses in the range of those delivered by Raycop. These studies give a strong support to the claim that Raycop will destroy 99.9% of bacteria by a combination of action at the membrane and DNA level. A further confirmation of this claim has been obtained by a study using the Raycop device itself. The experiments carried out demonstrated that an exposure of 2 seconds is sufficient to kill 99.9% of a population of E.coli and of Staphylococcus aureus (Hwang, 2005). The above is a statement from: Dr. Patrick Gallois, Mres, PhD Senior lecturer Faculty of Life Sciences University of Manchester
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