This paper presents a study of the effect of the low temperature atmospheric helium dielectric barrier discharge（DBD） on the Streptococcus mutans biofilms formed on tooth surface. Pig jaws were also treated by plasm...This paper presents a study of the effect of the low temperature atmospheric helium dielectric barrier discharge（DBD） on the Streptococcus mutans biofilms formed on tooth surface. Pig jaws were also treated by plasma to detect if there is any harmful effect on the gingiva.The plasma was characterized by using optical emission spectroscopy.Experimental data indicated that the discharge is very effective in deactivating Streptococcus mutans biofilms.It can destroy them with an average decimal reduction time（D-time） of 19 s and about 98%of thein were killed after a treatment time of 30 s.According to the survival curve kinetic an overall 32 s treatment time would be necessary to perform a complete sterilization.The experimental results presented in this study indicated that the helium dielectric barrier discharge,in plan-parallel electrode configuration,could be a very effective tool for deactivation of oral bacteria and might be a promising technique in various dental clinical applications.展开更多
目的:建立一种快速、简便地同时检测变形链球菌和远缘链球菌的方法。方法:以变形链球菌Dextranase基因设计引物,用PCR检测变形链球菌群细菌。结果:变形链球菌(血清型c、e、f)的PCR扩增产物为720 bp;远缘链球菌(血清型d、g)的PCR扩增产物...目的:建立一种快速、简便地同时检测变形链球菌和远缘链球菌的方法。方法:以变形链球菌Dextranase基因设计引物,用PCR检测变形链球菌群细菌。结果:变形链球菌(血清型c、e、f)的PCR扩增产物为720 bp;远缘链球菌(血清型d、g)的PCR扩增产物为460 bp;道勒链球菌(血清型h)910 bp;仓鼠链球菌(血清型a),鼠链球菌(血清型b)均为1 270 bp。其它异种菌均不能扩增出产物,因此该PCR检测具有高度的特异性。从细菌纯培养物中PCR检测的敏感性为105菌落形成单位(colony-form ing un its,CFU)。结论:PCR能同时检测变形链球菌和远缘链球菌。该检测方法具有较高的敏感性和特异性,有望运用于临床检测。展开更多
目的:通过透射电镜(transmission electron microscope,TEM)观察白屈菜红碱(chelerythrine,CHE)对变形链球菌(streptococcus mutans,S.mutans)作用后的形态学影响,探讨其抑菌机制。方法:选择变形链球菌ATCC25175作为实验菌株,实验分白...目的:通过透射电镜(transmission electron microscope,TEM)观察白屈菜红碱(chelerythrine,CHE)对变形链球菌(streptococcus mutans,S.mutans)作用后的形态学影响,探讨其抑菌机制。方法:选择变形链球菌ATCC25175作为实验菌株,实验分白屈菜红碱溶液处理组(实验组)及对照组,将2组细菌在37℃厌氧环境(80%N2、20%CO2)下培养24h,透射电镜观察细菌细胞结构的变化。结果:白屈菜红碱通过抑制变形链球菌的细胞分裂而抑制其生长,并对荚膜、细胞壁、细胞膜等结构产生显著影响,使其完整性受到破坏。结论:白屈菜红碱可以改变变形链球菌超微结构,这可能是其抑制细菌生长的机制之一。展开更多
基金supported by the National University Research Council,Ministry of Education,Research and Innovation,Romania (Grant PN-II-ID-PCE 2007-2013,nr.446/2009)
文摘This paper presents a study of the effect of the low temperature atmospheric helium dielectric barrier discharge（DBD） on the Streptococcus mutans biofilms formed on tooth surface. Pig jaws were also treated by plasma to detect if there is any harmful effect on the gingiva.The plasma was characterized by using optical emission spectroscopy.Experimental data indicated that the discharge is very effective in deactivating Streptococcus mutans biofilms.It can destroy them with an average decimal reduction time（D-time） of 19 s and about 98%of thein were killed after a treatment time of 30 s.According to the survival curve kinetic an overall 32 s treatment time would be necessary to perform a complete sterilization.The experimental results presented in this study indicated that the helium dielectric barrier discharge,in plan-parallel electrode configuration,could be a very effective tool for deactivation of oral bacteria and might be a promising technique in various dental clinical applications.
文摘目的:建立一种快速、简便地同时检测变形链球菌和远缘链球菌的方法。方法:以变形链球菌Dextranase基因设计引物,用PCR检测变形链球菌群细菌。结果:变形链球菌(血清型c、e、f)的PCR扩增产物为720 bp;远缘链球菌(血清型d、g)的PCR扩增产物为460 bp;道勒链球菌(血清型h)910 bp;仓鼠链球菌(血清型a),鼠链球菌(血清型b)均为1 270 bp。其它异种菌均不能扩增出产物,因此该PCR检测具有高度的特异性。从细菌纯培养物中PCR检测的敏感性为105菌落形成单位(colony-form ing un its,CFU)。结论:PCR能同时检测变形链球菌和远缘链球菌。该检测方法具有较高的敏感性和特异性,有望运用于临床检测。
文摘目的:通过透射电镜(transmission electron microscope,TEM)观察白屈菜红碱(chelerythrine,CHE)对变形链球菌(streptococcus mutans,S.mutans)作用后的形态学影响,探讨其抑菌机制。方法:选择变形链球菌ATCC25175作为实验菌株,实验分白屈菜红碱溶液处理组(实验组)及对照组,将2组细菌在37℃厌氧环境(80%N2、20%CO2)下培养24h,透射电镜观察细菌细胞结构的变化。结果:白屈菜红碱通过抑制变形链球菌的细胞分裂而抑制其生长,并对荚膜、细胞壁、细胞膜等结构产生显著影响,使其完整性受到破坏。结论:白屈菜红碱可以改变变形链球菌超微结构,这可能是其抑制细菌生长的机制之一。
