Dimitrios I. Avgoulas, Maria Petala, Romain Briandet, Yasmine Dergham, Marie-Francoise Noirot-Gros, Avraam Konstantinidis, Margaritis Kostoglou, Thodoris D. Karapantsios
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引用次数: 0
Abstract
The prolonged duration of future manned space missions conceals potential threats associated with microbial contamination. Such closed environments are susceptible to formation of complex biofilm communities, where microorganisms can thrive and further evolve. The objective of this study was to evaluate the impact of surface type, surface treatment and shear stress on biofilm formation in water facilities. To that aim, the ability of Pseudomonas fluorescens SBW25 to adhere on three space applications related materials, including passivated (SS) and both passivated and electropolished (SSEP) stainless steel, as well as Ti-6Al-4V (Ti) alloy was studied under stagnant and shear stress conditions after 24 h of exposure. Results indicated that surface type strongly affects bacterial adhesion under the same conditions. Surface coverage during static experiments was in the following order: SS > Ti > SSEP, while SS exhibited a fourfold surface coverage compared to SSEP highlighting the significance of surface treatment. Moreover, SS and Ti stimulate the formation of several microcolonies and their growth. On the other hand, the application of shear stress diminished bacterial attachment to the studied materials, the degree of which relied on the material type. In this case, bacterial settlement on SS and Ti was dependent on the surface texture, implying that surface roughness may also play an important role in cell adhesion under shear conditions. Furthermore, the metallic surfaces did not hinder bacterial attachment when silver ions were previously deposited on their surface. The deposition that occurs on metallic surfaces when in contact with water disinfected with silver ions, for example, during space missions, highlights its impact on the loss of disinfection capacity of silver ions.
未来载人太空任务的持续时间较长,隐藏着与微生物污染相关的潜在威胁。这种封闭环境容易形成复杂的生物膜群落,微生物可在其中繁衍生息并进一步进化。本研究的目的是评估表面类型、表面处理和剪切应力对供水设施中生物膜形成的影响。为此,研究了荧光假单胞菌 SBW25 在静止和剪切应力条件下暴露 24 小时后附着在三种空间应用相关材料上的能力,包括钝化不锈钢(SS)、钝化和电抛光不锈钢(SSEP)以及钛-6Al-4V(Ti)合金。结果表明,在相同条件下,表面类型对细菌的附着力有很大影响。静态实验中的表面覆盖率按以下顺序排列:SS > Ti > SSEP,而 SS 的表面覆盖率是 SSEP 的四倍,这凸显了表面处理的重要性。此外,SS 和 Ti 还能刺激多个微菌落的形成和生长。另一方面,施加剪切应力会减少细菌对所研究材料的附着,其程度取决于材料类型。在这种情况下,细菌在 SS 和钛上的沉降取决于表面纹理,这意味着表面粗糙度也可能在剪切条件下对细胞粘附起到重要作用。此外,当银离子沉积在金属表面时,金属表面也不会阻碍细菌的附着。当金属表面与银离子消毒过的水接触时,例如在太空任务中,金属表面会发生沉积,这突出表明了沉积对银离子消毒能力丧失的影响。
期刊介绍:
Frontiers in Materials is a high visibility journal publishing rigorously peer-reviewed research across the entire breadth of materials science and engineering. This interdisciplinary open-access journal is at the forefront of disseminating and communicating scientific knowledge and impactful discoveries to researchers across academia and industry, and the public worldwide.
Founded upon a research community driven approach, this Journal provides a balanced and comprehensive offering of Specialty Sections, each of which has a dedicated Editorial Board of leading experts in the respective field.