Protective pigmentation in UVB-screened Antarctic lichens studied by Fourier transform Raman spectroscopy: an extremophile bioresponse to radiation stress
| Autor: | Howell G. M. Edwards, Emma M. Newton, Charles S. Cockell, David D. Wynn-Williams |
|---|---|
| Rok vydání: | 2004 |
| Předmět: |
biology
business.industry 010401 analytical chemistry 02 engineering and technology Parietin 021001 nanoscience & nanotechnology biology.organism_classification 01 natural sciences Fourier transform raman 0104 chemical sciences chemistry.chemical_compound Optics chemistry Raman band Botany Caloplaca sublobulata Extremophile General Materials Science 14. Life underwater 0210 nano-technology business Spectroscopy Xanthoria elegans Lichen |
| Zdroj: | Journal of Raman Spectroscopy. 35:463-469 |
| ISSN: | 1097-4555 0377-0486 |
| Popis: | FT-Raman spectra were obtained for two Antarctic extremophiles, the epilithic lichens Xanthoria elegans and Caloplaca sublobulata from the maritime ecological long-term research site on Leonie Island. Twelve specimens from cloches designed for the filtering out and transmission of UVB radiation over a 2 year period and two specimens from the natural habitat outside the cloches were analysed in terms of their characteristic Raman bands from the two photoprotective pigments parietin and beta-carotene. Following chemometric analysis, the specimens inside the UVB-protective cloches exhibited a lower parietin:beta-carotene ratio than specimens from the same habitat that did not have UVB protection. The relative roles of parietin, a passive UVB photoprotectant, and beta-carotene are discussed and a possible duality of biological function is suggested for these pigments. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Plný text