浮游细菌，是指水体中营浮游生活的原核生物类群，主要包括自养和异养细菌及古细菌，总体上异养细菌的数量要远大于自养细菌，尽管绝大多数的浮游细菌个体大小只有0.2-2微米，但是它们在水生生态系统生物地球化学循环中具有极其重要的作用整个淡水生态系统中的物质和能量循环几乎完全依赖于浮游细菌的作用。
There was significant correlation between the abundance of bacterioplankton and chlorophyll a concentration in the next 6,12 and 24 hours(P＜0.01).
将浮游细菌的数量和后6小时,12小时,24小时的叶绿素a浓度进行相关分析,均呈极显著正相关(P＜0.01)。
参考来源 - 富营养化水体中微囊藻、菌、病毒数量关系研究·2,447,543篇论文数据，部分数据来源于NoteExpress
生物膜中细菌的基因表达和表型明显不同于浮游细菌，对抗生素具有较强的抵抗力。
Compared with planktonic bacteria, the bacteria in biofilms have the different gene expression and phenotype, as well as have an increased resistance to antimicrobials.
与常规的沉降法相比，浮游细菌采样器能直接得到单位体积空气中所含的菌落数，而且不受环境气流的影响。
Compared with the conventional settlement, planktonic bacteria sampler can be directly contained in unit volume of air bacteria counts, and the impact of air from the environment.
此外，不像Chromatium okenii等一类紫色浮游细菌，其细胞具有高度游动性Schlegel and Pfennig 1961； van Gemerden and Mas 1995 Fryx1只是弱能动性。
Moreover, unlike planktonic purple bacteria such as Chromatium okenii, whose cells are highly motile (Schlegel and Pfennig 1961; van Gemerden and Mas 1995), strain Fryx1 is only weakly motile.
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