关键词: 美洲大蠊, 血淋巴, 抗菌物质

Abstract: Periplaneta americana could be induced to produce antibacterial substances in the haemolymph by injection with live E. coli, heat killed S. aureus, P. aeruginosa and saline or treatment with ⁶⁰Co γ-rays, and with different respones. The haemolymph from the insect vaccinated by heat killed S. aures and P. aeruginosa was more active against bacteria than that by live E. coli or treated with ⁶⁰Co γ-rays. It was found that the haemolymph was efficient against several Grampositive and Gram-negative bacterial strains. It was also found that the haemolymph activity against P. aeruginosa and S. typhi was stronger than the antibacterial activity of the pieces of paper contained 10μg gentamicin or 30μg chloramphenicol, respectively.