Bacterial photoprotection through extracellular cadmium sulfide crystallites

Holmes, Justin D., Smith, Peter R., Evans-Gowing, Richard, Richardson, David J. ORCID:, Russell, David A. and Sodeau, John R. (1995) Bacterial photoprotection through extracellular cadmium sulfide crystallites. Photochemistry and Photobiology, 62 (6). pp. 1022-1026. ISSN 0031-8655

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Ultraviolet light and the heavy metal, cadmium, both have toxic effects on many microorganisms. In this communication we describe a method by which the bacterium Klebsiella aerogenes surmounts both problems using one biological process: the synthesis of cadmium sulfide (CdS) crystallites. These semiconductor particles absorb radiation in the UV spectral region and therefore, when K. aerogenes produces extracellular CdS material in response to environments containing cadmium ions, a photoprotective layer is formed. The effect of UVA radiation on cultures of Klebsiella aerogenes was monitored using electron microscopy, energy‐dispersive X‐ray analysis and electronic spectroscopy. The results show that at wavelengths 320 nm Λ 400 nm, a photoprotection period of between 4 and 6 h is induced, which eventually fails due to photodegradation of the semiconductor layer to metallic cadmium and elemental sulfur.

Item Type: Article
Uncontrolled Keywords: biochemistry,physical and theoretical chemistry ,/dk/atira/pure/subjectarea/asjc/1300/1303
Faculty \ School: Faculty of Science

Faculty of Science > School of Biological Sciences
Faculty of Science > School of Chemical Sciences and Pharmacy (former - to 2009)
UEA Research Groups: Faculty of Science > Research Groups > Organisms and the Environment
Faculty of Science > Research Groups > Molecular Microbiology
Faculty of Science > Research Centres > Centre for Molecular and Structural Biochemistry
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Depositing User: LivePure Connector
Date Deposited: 14 Jul 2022 17:30
Last Modified: 15 May 2023 00:54
DOI: 10.1111/j.1751-1097.1995.tb02403.x

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