Biofilm quantification on stone surfaces: comparison of various methods

Prieto, B.; Silva, B.; Lantes, O.

doi:10.1016/j.scitotenv.2004.05.003

Cited by 75 publications

(50 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…5 Biodecay changes the color parameters depending on the bioreceptivity of the stone, climatic factors, and type and association of organisms. 6,7 Heating at high temperatures can alter the a* parameter because of changes in Fe-rich components. 8 Saline mist exposure tests show the expected whitening during the salt exposure, which translates to changes in parameters, but still somewhat dependent on the original color of the stone (University of Oviedo report for Dragados OSHSA U.T.E).…”

Section: Introductionmentioning

confidence: 99%

Color changes in architectural limestones from pollution and cleaning

Grossi

Brimblecombe

Esbert

et al. 2007

Color Research & Application

124

View full text Add to dashboard Cite

This article investigates the impact of sulfur dioxide attack, deposition of dark particles in urban environments and laser cleaning with Nd:YAG 1064 nm on color change in a range of ornamental limestones. We have used the CIELAB and CIELCH systems to compare the relative importance of the variation of each coordinate for the color change. Sulfur dioxide and dark particle deposition seems to increase the chroma, most particularly in the yellow component. Particle deposition also leads to an obvious darkening of stone surfaces. Laser irradiation at 1064 nm affects the red component of limestone, particularly if they already possess a reddish color. In general, the more intense the original color of the stone the greater are the chromatic changes, but the direction change of the color-parameter affected by a particular process remains the same. It has always been apparent in an atmosphere heavily polluted with soot that the main changes to light-colored stones are the exponential decrease in the parameter L* (darkening-blackening). This has important aesthetic and social implications. However, in the near future it may be that in cleaner atmospheres, perhaps more dominated by organic pollutants, a yellowing process may be of greater concern.

show abstract

Section: Introductionmentioning

confidence: 99%

Color changes in architectural limestones from pollution and cleaning

Grossi

Brimblecombe

Esbert

et al. 2007

Color Research & Application

124

View full text Add to dashboard Cite

show abstract

“…Other authors have also observed a good linear relationship between colorimetric measurements and the abundance of cyanobacteria (Prieto et al 2004). Our results showed that only four expositions at 553 kJ m −2 over 2 weeks were enough to kill the microorganisms present in the biofilm and, consequently, to cause the green color to disappear from the biofilm and specifically from the microalgae.…”

Section: In Situ Experimentsmentioning

confidence: 74%

UV-C as an efficient means to combat biofilm formation in show caves: evidence from the La Glacière Cave (France) and laboratory experiments

Pfendler

Einhorn

Karimi

et al. 2017

Environ Sci Pollut Res

View full text Add to dashboard Cite

Ultra-violet C (UV-C) treatment is commonly used in sterilization processes in industry, laboratories, and hospitals, showing its efficacy against microorganisms such as bacteria, algae, or fungi. In this study, we have eradicated for the first time all proliferating biofilms present in a show cave (the La Glacière Cave, Chaux-lès-Passavant, France). Colorimetric measurements of irradiated biofilms were then monitored for 21 months. To understand the importance of exposition of algae to light just after UV radiation, similar tests were carried out in laboratory conditions. Since UV-C can be deleterious for biofilm support, especially parietal painting, we investigated their effects on prehistoric pigment. Results showed complete eradication of cave biofilms with no algae proliferation observed after 21 months. Moreover, quantum yield results showed a decrease directly after UV-C treatment, indicating inhibition of algae photosynthesis. Furthermore, no changes in pigment color nor in chemical and crystalline properties has been demonstrated. The present findings demonstrate that the UV-C method can be considered environmentally friendly and the best alternative to chemicals. This inexpensive and easily implemented method is advantageous for cave owners and managers.

show abstract

“…A more sophisticated, but labor-intensive, method was developed , but a more practical approach, such as colorimetric evaluation, could also be used (Prieto et al, 2004;Pinna et al, 2012). Colorimetric evaluation is already being implemented to monitor changes undergone by the capstones on the Senator Daniel K. Inouye Terrace from pre-to postcleaning and beyond until reinfection.…”

Section: Resultsmentioning

confidence: 99%

Conservation of the Exterior of the National Museum of the American Indian Building

2017

Smithsonian Contributions to Museum Conservation

View full text Add to dashboard Cite

show abstract

Biofilm quantification on stone surfaces: comparison of various methods

Cited by 75 publications

References 15 publications

Color changes in architectural limestones from pollution and cleaning

Color changes in architectural limestones from pollution and cleaning

UV-C as an efficient means to combat biofilm formation in show caves: evidence from the La Glacière Cave (France) and laboratory experiments

Conservation of the Exterior of the National Museum of the American Indian Building

Contact Info

Product

Resources

About