| microbiological investigation on black crusts from open-air stone monuments of bologna (italy). | samples of black crusts taken from open-air stone monuments in bologna dating back to between the twelfth and the nineteenth century were considered. the microbiological test procedures isolated from a high number of chemoorganotrophic bacteria, each of the samples although it was expected to find chemo-lithotrophic (specially sulfur-oxidizing and nitrifying) bacteria on account of the great amounts of sulphur, carbon, nitrogen dioxides and ammonia in the air. sporogenous and asporogenous specie ... | 2000 | 10872690 |