Killing bacteria present on surfaces in films or in droplets using microwave UV lamps.

Barkhudarov, E M, Christofi, Nicholas, Kossyi, I A, Misakyan, M A, Sharp, John and Taktakhisvili, I M (2008) Killing bacteria present on surfaces in films or in droplets using microwave UV lamps. World Journal of Microbiology & Biotechnology, 24 (6). pp. 761-769. ISSN 0959-3993

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    The killing of bacteria on surfaces by two types
    of UV sources generated by microwave radiation is
    described. In both cases, UV radiation is produced by gasdischarge
    electrodeless lamps (Ar/Hg) excited by microwaves
    generated by a power supply from a standard
    domestic microwave oven. For UV lamp excitation, one of
    these sources makes use of a coaxial line with a truncated
    outer electrode that allows the excitation of gases and
    gaseous mixtures over a wide range of pressures at a
    comparatively low microwave power. In the second source,
    UV lamps are placed inside a microwave oven. Ultraviolet
    generated by the two sources was used to destroy vegetative
    Escherichia coli bacteria dispersed in thin films and in
    droplets on surfaces. Two types of UV lamps were used in
    the study. The first was constructed of quartz that filtered
    UV below 200 nm preventing the dissociation of oxygen in
    air and, hence, ozone production. The second type of tube
    was transparent to UV below 200 nm facilitating ozone
    production in air surrounding it. It was shown that bacterial
    cells dispersed in films on surfaces are killed more rapidly
    than cells present in droplets when using the lamps producing
    ozone and UV radiation. The UV sources described
    can effect rapid killing and constitute a cost-effective
    treatment of food and other surfaces, and, the destruction of
    airborne viruses and bacteria. The lamps can also be utilised
    for the rapid eradication of microorganisms in liquids

    Item Type: Article
    Print ISSN: 0959-3993
    Electronic ISSN: 1573-0972
    Uncontrolled Keywords: microwave UV lamps; solid surface disinfection; microbial pollutants; organic pollutants; UV radiation;
    University Divisions/Research Centres: Faculty of Health, Life & Social Sciences > School of Life Sciences
    Dewey Decimal Subjects: 600 Technology > 620 Engineering > 628 Sanitary & municipal engineering
    500 Science > 570 Life sciences; biology > 579 Microorganisms, fungi & algae
    Library of Congress Subjects: G Geography. Anthropology. Recreation > GE Environmental Sciences
    Q Science > QR Microbiology
    Item ID: 2614
    Depositing User: Mrs Lyn Gibson
    Date Deposited: 22 May 2009 15:39
    Last Modified: 11 Feb 2013 11:24

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