Influence of different fatty acids and fatty acid methyl esters on cell integrity of B. fibrisolvens JW11. Loss of cell integrity was determined fluorimetrically by propidium iodide fluorescence. LNA, cis-9, cis-12, cis- 15-18:3; γLNA, cis-6, cis-9, cis-12-18:3; LA, cis-9, cis-12-18:2; CLA, a mixture of cis-9, trans-11-18:2 and trans-10, cis-12-18:2; VA, trans-11-18:1; OA, cis-9-18:1; SA, 18:0. In order of increasing shading density: 50 μg fatty acid ml-1, 200 μg fatty acid ml-1, 50 μg fatty acid methyl ester ml-1, 200 μg fatty acid methyl ester ml-1. Results are means and SD from three determinations.