Lookup NU author(s): Dr Thomas Dzeha,
Dr Michael Hall,
Professor Grant Burgess
This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).
This study focused on bacteria isolated from the marine cyanobacterium, Moorea producens collected off the Kenyan coast at Shimoni, Wasini, Kilifi and Mida. UV irradiance of isolates (302 nm, 70 W m-2, 0-1h) established Bacillus licheniformis as the most UV resistant strain, with the following order of taxon resistance: Bacilli > γ proteobacteria > Actinobacteria. UV resistance was independent of pigmentation. The phylogenetic distance of B. licheniformis and Bacillus aerius relative to M. producens CCAP 1446/4 was 2.5635 and 2.3238 respectively. Survival of B. licheniformis upon UV irradiance followed first order kinetics (k = 0.035 min-1, R2 = 0.88). Addition of aqueous extracts (2, 10, 20 and 40 mg mL-1) of this B. licheniformis strain on the less UV resistant Marinobacterium stanieri were not significant however, the commercial sunscreen benzophenone-3 (BP-3) positive control and the time of irradiance were significant. Detection of bacteria on M. producens filaments stained with acridine orange confirmed its non-axenic nature. UV resistance in bacteria isolated from M. producens has not been observed previously. Additionally, UV resistance of B. licheniformis is being observed for the first time.
Author(s): Dzeha T, Nyiro C, Kardasopoulos D, Mburu D, Mwafaida J, Hall MJ, Burgess JG
Publication type: Article
Publication status: Published
Print publication date: 12/04/2019
Online publication date: 19/08/2018
Acceptance date: 22/06/2018
Date deposited: 28/08/2018
ISSN (electronic): 2045-8827
Publisher: John Wiley & Sons Ltd.
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