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粘性放线菌单菌种早期生物膜的连续观察及胞外多糖合成的研究
The Study on Exopolysaccharides in the Formation of Actinomyces Viscosus Biofilm
【作者】 蒲晓芬;
【作者基本信息】 四川大学 , 口腔临床医学, 2006, 硕士
【摘要】 目的:对粘性放线菌单菌种生物膜的形成过程进行连续动态观察,并比较生物膜形成过程中细菌合成胞外多糖的能力,以此了解粘性放线菌生物膜形成过程中的结构演化特点,并探讨胞外多糖在粘性放线菌生物膜形成各个阶段的可能作用。 方法:粘性放线菌在静止培养基的玻片上形成生物膜,用BOBOTM-3和CalcoflourTM分别对细菌和胞外多糖进行染色,在CLSM下观察生物膜结构变化及细菌与多糖的空间分布。同样条件下形成生物膜,用蒽酮-硫酸法测定细菌合成胞外水溶性多糖与水不溶性多糖的含量。 结果:1.粘性放线菌生物膜的形成可分三个阶段:初始粘附期(12小时以前),生物膜发展期(12-24小时),生物膜成熟期(24小时以后)。 2.细菌在玻片上首先形成细丝状(filamentous)的粘性物质,疏松易洗脱,之后在12小时左右形成相对牢固的不易洗脱的堆积粘附物,此时也发现水不溶性胞外多糖的含量出现一个剧增峰值(P<0.05)。3.在生物膜的发展期,细菌生长与多糖堆积迅速,空间分布一致,且可看到此阶段早期整个生物膜呈细菌与多糖的大量团块堆积,无明显的生物膜结构,而晚期细菌与多糖出现了典型的成熟生物膜结构,细菌紧密包裹在胞外多糖基质中,其间充满孔隙,表面布满沟壑。4.成熟期,生物膜抗流体冲击能力明
【Abstract】 Purpose: To elucidate the structural evolution in Actinomyces viscosus biofilm formation and the spatial distribution of exopolysaccharides(EPS) in it. To comparatively analyze the change curve of water-soluble exopolysaccharides and water-insoluble exopolysaccharides in the biofilm formation , then further investigates the functions of the two different exopolysaccharides on adhesion, development, and maturation of Actinomyces viscosus biofilm.Materials and methods: 1.The Actinomyces viscosus biofilm wasmade by allowing bacterium to attach to the clean glass surface. The biofilm structures at 9,12,15,18 ,24 hours and exopolysaccharides distribution were visualized with fluorescent staining, BoBoTM3 and CalcofluorTMrespectively by confocal laser scanning microscopy (CLSM). 2. The biochemical method was applied to measure the production of soluble and insoluble exopolysaccharides by adhesive Actinomyces viscosus and planktonic ones in different culture times.Results: 1. Actinomyces viscosus biofilm can be approximately divided into three stages —initial adhesion (about 12 hours ago) , development (about
【Key words】 Actinomyces viscosus; biofilm; exopolysaccharides; confocal laser scanning microscopy;
- 【网络出版投稿人】 四川大学 【网络出版年期】2007年 03期
- 【分类号】R780.2
- 【下载频次】313