Investigation inhibitory effect of the fungus Alternaria filtrate on the growth of the types of bacteria used under study

Abstract

The present investigative study revealed the inhibitory effect of Alternaria isolates on selectively tested gram-positive and negative bacteria used in this study. Isolate-4 was distinguished by its ability to induce the highest inhibitory effect among the four isolates on E. coli bacteria, followed by isolation-2 as the inhibitory diameter of two isolates was (14 and 10.5) respectively, while the inhibitory diameter of the two isolates (4 and 2) was less. Effect on Proteus Vulgaris bacteria by reaching the inhibitory diameter of 12 mm to isolate-4, followed by isolate-2, isolate-3 and finally isolation-1, as it reached respectively (11.5, 9 and 7) mm, while no significant effect was observed for the four isolates on Bacillus substiles except for the two isolates (3 and 1), they had a clear effect, as it reached a diameter Inhibition (7 and 9), while no effect on staphylococcus aureus was observed.