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Abstract
In this research, extracts prepared from plant materials were tested against Mycobacterium tuberculosis. H37Rv (ATCC 27294). Of the 107 plants tested, five exhibited more than 90% inhibition of growth of Mycobacterium tuberculosis., at concentrations lower than 100 µg/ml. Jervin from Veratrum album. L., usnic acid from Usnea barbata. (L.) Mott, and alantolactone from Inula helenium. L. subsp. turcoracemosa. were isolated and their minimum inhibitory concentrations (MICs) were determined as 25, 12.5, and 3.125 µg/ml, respectively.