Ecological strategies of bacterial communities in prehistoric stone wall paintings across weathering gradients: A case study from the Borana zone in southern Ethiopia

Mugnai, Gianmarco; Borruso, Luigimaria; Wu, Ying-Li; Gallinaro, Marina; Cappitelli, Francesca; Zerboni, Andrea; Villa, Federica

doi:10.1016/j.scitotenv.2023.168026

Cited by 1 publication

(1 citation statement)

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“…In subaerial biofilms (SABs), microorganism photosynthetic pigments grow as colourful complex sessile communities on mineral surfaces exposed to the atmosphere, such as the stone surfaces of historic buildings [29]. The SAB pigments are influenced by the nature of the substrate [30,31] as well as by the location and environmental conditions [32]. Since the physiological state of photosynthetic microorganisms is closely related to the activity of the photosynthetic system, any variation in their spectroscopic properties indicates changes in the microbial community physiology [29,33].…”

Section: Description Of the Case Studiesmentioning

confidence: 99%

Enhancing hyperspectral imaging through macro and multi-modal capabilities

Ardini,

Corti,

Ghirardello

et al. 2024

J. Phys. Photonics

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Hyperspectral Imaging (HSI) has emerged as an effective tool to obtain spatially resolved spectral information of artworks by combining optical imaging with spectroscopy. This technique has proven its efficacy in providing valuable information both at the large and microscopic scale. Interestingly, the macro scale has yet to be thoroughly investigated using this technology. While standard HSI methods include the use of spatial or spectral filters, alternative methods based on Fourier-transform interferometry have also been utilised. Among these, a hyperspectral camera employing a birefringent common-path interferometer, named TWINS, has been developed, showing a high robustness and versatility. In this paper, we propose the combination of TWINS with a macro imaging system for the study of cultural heritage. We will show how the macro-HSI system was designed, and we will demonstrate its efficient capabilities to collect interferometric images with high visibility and good signal of both reflectance and fluorescence on the same field of view, even on non-flat samples. The relevance of the macro technology is demonstrated in two case studies, aiding in the analysis of biofilms on stone samples and of the degradation of dyed textiles.

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