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Comparison of porous Serena stone specimens (10 by 10 by 5 cm) after treatment for 15 h with D. vulgaris subsp. vulgaris ATCC 29579 in nonfiltered DSMZ 63 medium-based Carbogel (left) or with D. vulgaris subsp. vulgaris ATCC 29579 in filtered, iron-free DSMZ 63 medium-based Carbogel (right).
