Abstrad:The weath.ering of stone and masonry results, among other phenornena, in the formation of effiorescences, a deposit of salts not originally evident in the sound material, and composed of a variety of different hygroscopic salls, including carbonates, chlorides, nitrates, sulphates, etc. Thus the deteriorated areas of sorne monuments can be considered as extremely saline environments, at least in the effiorescences zones. These zones seemed to be a particular niche for investigating halotolerant and/or halophilic bacteria, but only recently a few reports appeared stressing the importanee ofthese types ofbacteria. In this paper, bacteria were isolated from samples taken from the effiorescences originated in the Chapel of AH Souls, cathedral of Jere~ Spain, and cultured in media with increasing concentrations ofhalite" or epsomite (up to 25 %). The most frequently isolated genus waS Baci/lus, followed by Staphylococcus, Kocuria, Micrococcus, Paenibaci/lus and Arthrobacter. The origin, occurrence and ecology ofhalotolerant and halophilic bacteria in monuments are discussed.
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