کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4366038 1616350 2006 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Lichen-like colonies of pure Trentepohlia on limestone monuments
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم محیط زیست علوم زیست محیطی (عمومی)
پیش نمایش صفحه اول مقاله
Lichen-like colonies of pure Trentepohlia on limestone monuments
چکیده انگلیسی

Biofilms were collected on discoloured limestone samples and on adhesive tape from historic buildings at the Mayan site of Edzna, in Campeche, Mexico. Grey, brown, and black areas were colonised predominantly by coccoid and colonial cyanobacteria, also detected as endoliths. The major biomass on the pink stone surface was Trentepohlia. At low power, surface micropits containing crustose-lichen-like black colonies were seen within these pink areas. These were apparently pure colonies of T. umbrina; no filamentous fungi were detected here. The black colour was produced by dense, amorphous pigment deposits in the colony centres. Insolation levels were high (∼400 μmphotons m−2 s−1) and the moisture content of the stone was 0.7%. The high carotenoid:chlorophyll-α ratio of Trentepohlia biofilms (3.9:1) is an adaptation protecting against environmental stress. Trentepohlia caused severe local erosion (pitting) and, when present as a more uniform biofilm, the well-known pink surface discoloration.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Biodeterioration & Biodegradation - Volume 58, Issues 3–4, October–December 2006, Pages 119–123
نویسندگان
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