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Effect of indoor lights on development of Aspergillus versicolor in buildings

Effect of indoor lights on development of Aspergillus versicolor in buildings
Effect of indoor lights on development of Aspergillus versicolor in buildings
The presence of moulds inside buildings has been a growing concern as it may affect the integrity of buildings and the health of occupants. Most studies have focused on growth conditions involving moisture, temperature and construction materials. Though moulds are known to have light responses, ranging from developmental regulating to metabolites producing, it is unclear whether they respond to light levels found indoors. This study analysed the influence of indoor light of varying colour temperature and illuminance on germination, growth and sporulation of Aspergillus versicolor. Mould germination was not significantly affected by colour temperature or light intensity. The development of mycelia was inhibited when completely exposed to light (1050 lx), both warm and cool lighting, and the cool colour temperature had a stronger effect. If the illuminance increases from darkness to 1050 lx, changes in the morphology and biological process were observed. Colonies exposed to high illuminance were high and denser; however, incubation under dark or weak light intensity triggered mould conidiation earlier. This difference in light responses of A. versicolor may result from protective mechanisms against environmental or light-relevant stress. With the results, this study demonstrates the role of indoor lights in regulating fungal development in buildings.
Aspergillus versicolor, mould lifecycle, artificial lights, illuminance, colour temperature
103-108
University of Southampton
Chen, Borui
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Barrett, Edward
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Efthymiopoulos, Spyros
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Altamirano, Hector
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Gauthier, Stephanie
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Nicol, Fergus
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Brotas, Luisa
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Schiano-Phan, Rosa
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Sukontason, Nichaphat
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Turner, Philip
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Gauthier, Stephanie
Nicol, Fergus
Brotas, Luisa
Schiano-Phan, Rosa
Sukontason, Nichaphat
Turner, Philip
Chen, Borui
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Barrett, Edward
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Efthymiopoulos, Spyros
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Altamirano, Hector
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Gauthier, Stephanie
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Nicol, Fergus
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Brotas, Luisa
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Schiano-Phan, Rosa
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Sukontason, Nichaphat
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Turner, Philip
772d9dd5-829d-4e40-83a2-f8ea70ee2b14
Gauthier, Stephanie
Nicol, Fergus
Brotas, Luisa
Schiano-Phan, Rosa
Sukontason, Nichaphat
Turner, Philip

Chen, Borui, Barrett, Edward, Efthymiopoulos, Spyros and Altamirano, Hector (2022) Effect of indoor lights on development of Aspergillus versicolor in buildings. Gauthier, Stephanie, Nicol, Fergus, Brotas, Luisa, Schiano-Phan, Rosa, Sukontason, Nichaphat, Turner, Philip, Gauthier, Stephanie, Nicol, Fergus, Brotas, Luisa, Schiano-Phan, Rosa, Sukontason, Nichaphat and Turner, Philip (eds.) In Proceedings of the 11th Masters Conference: People and Buildings. vol. 1, University of Southampton. pp. 103-108 . (doi:10.5258/SOTON/P1100).

Record type: Conference or Workshop Item (Paper)

Abstract

The presence of moulds inside buildings has been a growing concern as it may affect the integrity of buildings and the health of occupants. Most studies have focused on growth conditions involving moisture, temperature and construction materials. Though moulds are known to have light responses, ranging from developmental regulating to metabolites producing, it is unclear whether they respond to light levels found indoors. This study analysed the influence of indoor light of varying colour temperature and illuminance on germination, growth and sporulation of Aspergillus versicolor. Mould germination was not significantly affected by colour temperature or light intensity. The development of mycelia was inhibited when completely exposed to light (1050 lx), both warm and cool lighting, and the cool colour temperature had a stronger effect. If the illuminance increases from darkness to 1050 lx, changes in the morphology and biological process were observed. Colonies exposed to high illuminance were high and denser; however, incubation under dark or weak light intensity triggered mould conidiation earlier. This difference in light responses of A. versicolor may result from protective mechanisms against environmental or light-relevant stress. With the results, this study demonstrates the role of indoor lights in regulating fungal development in buildings.

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e-pub ahead of print date: 17 October 2022
Venue - Dates: 11th Masters Conference: People and Buildings, University of Westminster, London, United Kingdom, 2022-09-16 - 2022-09-16
Keywords: Aspergillus versicolor, mould lifecycle, artificial lights, illuminance, colour temperature

Identifiers

Local EPrints ID: 471031
URI: http://eprints.soton.ac.uk/id/eprint/471031
PURE UUID: b0d9dca4-e420-436c-bbd3-5257a42d3859
ORCID for Stephanie Gauthier: ORCID iD orcid.org/0000-0002-1720-1736
ORCID for Philip Turner: ORCID iD orcid.org/0000-0002-8146-0249

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Date deposited: 25 Oct 2022 16:32
Last modified: 09 Nov 2022 02:58

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Contributors

Author: Borui Chen
Author: Edward Barrett
Author: Spyros Efthymiopoulos
Author: Hector Altamirano
Editor: Fergus Nicol
Editor: Luisa Brotas
Editor: Rosa Schiano-Phan
Editor: Nichaphat Sukontason
Editor: Philip Turner ORCID iD
Editor: Stephanie Gauthier
Editor: Fergus Nicol
Editor: Luisa Brotas
Editor: Rosa Schiano-Phan
Editor: Nichaphat Sukontason
Editor: Philip Turner

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