改写减少重复： chitosan samples from shiitake stipes showed a dose-dependently inhibitory effect on eight species of Gram positive and Gram negative pathogenic bacteria at the concentration as low as 05 mgml

Chitosan samples derived from shiitake stipes demonstrated an inhibitory effect on eight species of pathogenic bacteria, both Gram positive and Gram negative. The effect was found to be dose-dependent, with significant inhibition observed at concentrations as low as 0.5 mg/ml.