【摘要】 采用琼脂糖弥散试验和活菌计数试验检测猪小肠抗菌肽对 11株细菌 (鸡大肠杆菌 (O1 ) C8384 5株、鸡白痢沙门氏菌 C79- 13株、大肠杆菌 (O2 )、大肠杆菌 (O78)、猪致病性大肠杆菌自然分离株、鸡致病性大肠杆菌自然分离株、白色葡萄球菌、金黄色葡萄球菌 ATCC2 5 92 3株、猪致病性沙门氏菌自然分离株、绿脓杆菌 ATCC2 785 3株、鱼致病性嗜水气单胞菌 )的作用。结果表明 ,猪小肠抗菌肽对以上各株细菌均有不同程度的抑制作用 ,杀菌率由 5 9.5 %～ 98.5 %不等。扫描电镜下观察猪小肠抗菌肽分别与鸡大肠杆菌 (O1 ) C8384 5株、鸡白痢沙门氏菌 C79- 13株和金黄色葡萄球菌 ATCC2 5 92 3株在 37.0℃条件下共培养 15 m in后细菌形态学的改变 ,结果发现 ,有的细菌表面出现囊泡样或不规则突起样结构 ;有的细菌严重变形、扭曲 ,一端呈火柴头状 ;有的细菌表面变得粗糙、皱缩、胞膜破裂、内容物外流而死亡更多还原

【Abstract】 The activities of antibacterial peptides （ABP） extracted from pig small intestine against 11 strains of bacteria were tested by agarose diffusion assay and live bacteria counting assay. The results showed that the ABP killed or inhibited all tested bacteria strongly except E.coli O₂ and S.typhisuis isolated from an ill pig, and the bacteria-killing rates varied from 59.5% to 98.5%. Scanning electron microscopy of S.pullorum C79-13, E.coli C83845 and S.aureus ATCC25923 treated with the ABP showed considerable roughening and blebbing of the bacterial surfaces providing conclusive evidence that the ABP was membrane active.更多还原