AIM:To compare the influence and clearance effect of enzymatic and non-enzymatic detergents against Escherichia coli (E. coli) biofilm on the inner surface of gastroscopes.METHODS:Teflon tubes were incubated in a mixt...AIM:To compare the influence and clearance effect of enzymatic and non-enzymatic detergents against Escherichia coli (E. coli) biofilm on the inner surface of gastroscopes.METHODS:Teflon tubes were incubated in a mixture of different detergents and E. coli culture (106 CFU/mL) for 72 h at 15℃,and biofilms on the inner surface of the teflon tubes were analyzed by bacterial count and scanning electron microscopy. To evaluate the clear-ance effect of detergents,after biofilms were formed on the inner surface of Teflon tubes by 72 h lavage with E. coli culture,tubes were lavaged by enzymatic and non-enzymatic detergents at a speed of 250 mL/min,then biofilms on the inner surface were analyzed by bacterial count and scanning electron microscopy.RESULTS:Non-enzymatic detergent had a better inhi-bition function on biofilm formation than enzymatic de-tergent as it reduced bacterial burden by 2.4 log compared with the control samples (P = 0.00). Inhibition function of enzymatic detergent was not significantly different to that of control samples and reduced bac-terial burden by 0.2 log on average (P > 0.05). After lavaging at 250 mL/min for 3 min,no living bacteria were left in the tubes. Scanning electron microscopy observation showed biofi lms became very loose by the high shear force effect. CONCLUSION:Non-enzymatic detergent has a better inhibition effect on biofilm formation at room temperature. High speed pre-lavage and detergents are very important in temporal formed biofilm elimination.展开更多
目的:研究TetR家族转录调控子(TFR)基因敲除对鲍曼不动杆菌生物被膜(BF)生成能力的影响。方法:通过构建自杀质粒的方法敲除鲍曼不动杆菌SZ042株TFR基因,并设计内部引物和外部引物的方法进行敲除株的验证,采用结晶紫染色法对比观察和定...目的:研究TetR家族转录调控子(TFR)基因敲除对鲍曼不动杆菌生物被膜(BF)生成能力的影响。方法:通过构建自杀质粒的方法敲除鲍曼不动杆菌SZ042株TFR基因,并设计内部引物和外部引物的方法进行敲除株的验证,采用结晶紫染色法对比观察和定量分析基因敲除前后BF生成的情况。结果:成功敲除鲍曼不动杆菌中TFR基因,获得TFR基因敲除株SZ042/ΔtetRt株;与野生株相比,敲除株菌膜形成量明显下降,培养4、8、12、16、24 h BF的生成量差异均具有统计学意义(P<0.05)。结论:TFR基因对鲍曼不动杆菌被膜生成和形态维持有促进作用,可以作为开发针对鲍曼不动杆菌BF生成机制的新型抗菌药物的潜在靶点。展开更多
基金Supported by Medical and Health Research Foundation of Zhejiang Province, China, No. 2007B040, 2007B039
文摘AIM:To compare the influence and clearance effect of enzymatic and non-enzymatic detergents against Escherichia coli (E. coli) biofilm on the inner surface of gastroscopes.METHODS:Teflon tubes were incubated in a mixture of different detergents and E. coli culture (106 CFU/mL) for 72 h at 15℃,and biofilms on the inner surface of the teflon tubes were analyzed by bacterial count and scanning electron microscopy. To evaluate the clear-ance effect of detergents,after biofilms were formed on the inner surface of Teflon tubes by 72 h lavage with E. coli culture,tubes were lavaged by enzymatic and non-enzymatic detergents at a speed of 250 mL/min,then biofilms on the inner surface were analyzed by bacterial count and scanning electron microscopy.RESULTS:Non-enzymatic detergent had a better inhi-bition function on biofilm formation than enzymatic de-tergent as it reduced bacterial burden by 2.4 log compared with the control samples (P = 0.00). Inhibition function of enzymatic detergent was not significantly different to that of control samples and reduced bac-terial burden by 0.2 log on average (P > 0.05). After lavaging at 250 mL/min for 3 min,no living bacteria were left in the tubes. Scanning electron microscopy observation showed biofi lms became very loose by the high shear force effect. CONCLUSION:Non-enzymatic detergent has a better inhibition effect on biofilm formation at room temperature. High speed pre-lavage and detergents are very important in temporal formed biofilm elimination.
文摘目的:研究TetR家族转录调控子(TFR)基因敲除对鲍曼不动杆菌生物被膜(BF)生成能力的影响。方法:通过构建自杀质粒的方法敲除鲍曼不动杆菌SZ042株TFR基因,并设计内部引物和外部引物的方法进行敲除株的验证,采用结晶紫染色法对比观察和定量分析基因敲除前后BF生成的情况。结果:成功敲除鲍曼不动杆菌中TFR基因,获得TFR基因敲除株SZ042/ΔtetRt株;与野生株相比,敲除株菌膜形成量明显下降,培养4、8、12、16、24 h BF的生成量差异均具有统计学意义(P<0.05)。结论:TFR基因对鲍曼不动杆菌被膜生成和形态维持有促进作用,可以作为开发针对鲍曼不动杆菌BF生成机制的新型抗菌药物的潜在靶点。
