Association of Cryptosporidium parvum with Suspended Particles: Impact on Oocyst Sedimentation
Association of Cryptosporidium parvum with Suspended Particles: Impact on Oocyst Sedimentation
复制标题
小隐孢子虫与悬浮颗粒的关联：对卵囊沉降的影响
DOI：
10.1128/aem.71.2.1072-1078.2005
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发表时间：
2005
影响因子：
4.4
通讯作者：
T. Harter
中科院分区：
文献类型：
--
作者：
Kristin E. Searcy;A. Packman;E. Atwill;T. Harter
摘要微小隐孢子虫卵囊与悬浮颗粒物的接触会改变卵囊的有效物理性质，从而影响其在水体中的迁移。为了评估这种行为，C。在各种水化学条件下，将细小卵囊与各种悬浮沉积物混合，并观察卵囊的最终沉降。直接显微镜观察显示卵囊附着在悬浮沉积物上。沉降柱和批处理实验表明，卵囊从悬浮液中去除时，与沉积物的速度要高得多。卵囊沉积的速率主要取决于卵囊混合的沉积物的类型。背景水条件的变化有一个相对较小的影响卵囊颗粒协会的程度和由此产生的卵囊沉积。我们认为C.细小卵囊与悬浮颗粒的相互作用增强了卵囊在自然沃茨中的沉降，在预测病原体在环境中的迁移时，通常应考虑这种相互作用。
ABSTRACT The association of Cryptosporidium parvum oocysts with suspended particles can alter the oocysts' effective physical properties and influence their transport in aquatic systems. To assess this behavior, C. parvum oocysts were mixed with various suspended sediments under a variety of water chemical conditions, and the resulting settling of the oocysts was observed. Direct microscopic observations showed that oocysts attached to suspended sediments. Settling column and batch experiments demonstrated that oocysts are removed from suspension at a much higher rate when associated with sediments. The rate of oocyst sedimentation depended primarily on the type of sediment with which the oocysts were mixed. Changes in background water conditions had a relatively small impact on the extent of oocyst-particle association and the resulting oocyst deposition. We believe that the ubiquitous association of C. parvum oocysts with suspended particles enhances the sedimentation of oocysts in natural waters and that this interaction should generally be considered when predicting the migration of pathogens in the environment.