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Quantitative profiling of built environment bacterial and fungal communities reveals dynamic material dependent growth patterns and microbial interactions.
Indoor Air ( IF 4.3 ) Pub Date : 2020-08-05 , DOI: 10.1111/ina.12727
Ying Xu 1 , Ruby Tandon 2 , Chrislyn Ancheta 2 , Pablo Arroyo 2 , Jack A Gilbert 3 , Brent Stephens 4 , Scott T Kelley 1, 2
Affiliation  

Indoor microbial communities vary in composition and diversity depending on material type, moisture levels, and occupancy. In this study, we integrated bacterial cell counting, fungal biomass estimation, and fluorescence‐assisted cell sorting (FACS) with amplicon sequencing of bacterial (16S rRNA) and fungal (ITS) communities to investigate the influence of wetting on medium density fiberboard (MDF) and gypsum wallboard. Surface samples were collected longitudinally from wetted materials maintained at high relative humidity (~95%). Bacterial and fungal growth patterns were strongly time‐dependent and material‐specific. Fungal growth phenotypes differed between materials: spores dominated MDF surfaces while fungi transitioned from spores to hyphae on gypsum. FACS confirmed that most of the bacterial cells were intact (viable) on both materials over the course of the study. Integrated cell count and biomass data (quantitative profiling) revealed that small changes in relative abundance often resulted from large changes in absolute abundance, while negative correlations in relative abundances were explained by rapid growth of only one group of bacteria or fungi. Comparisons of bacterial‐bacterial and fungal‐bacterial networks suggested a top‐down control of fungi on bacterial growth, possibly via antibiotic production. In conclusion, quantitative profiling provides novel insights into microbial growth dynamics on building materials with potential implications for human health.

中文翻译:

建筑环境细菌和真菌群落的定量分析揭示了动态材料依赖性生长模式和微生物相互作用。

室内微生物群落的组成和多样性取决于材料类型、湿度水平和占用情况。在这项研究中,我们将细菌细胞计数、真菌生物量估计和荧光辅助细胞分选 (FACS) 与细菌 (16S rRNA) 和真菌 (ITS) 群落的扩增子测序相结合,以研究润湿对中密度纤维板 (MDF) 的影响。 ) 和石膏墙板。从保持高相对湿度 (~95%) 的润湿材料纵向收集表面样品。细菌和真菌的生长模式具有很强的时间依赖性和材料特异性。材料之间的真菌生长表型不同:孢子在 MDF 表面占主导地位,而真菌从孢子转变为石膏上的菌丝。FACS 证实,在研究过程中,两种材料上的大多数细菌细胞都是完整的(有活力的)。综合细胞计数和生物量数据(定量分析)表明,相对丰度的微小变化通常是由绝对丰度的大变化引起的,而相对丰度的负相关可以用仅一组细菌或真菌的快速生长来解释。细菌-细菌和真菌-细菌网络的比较表明真菌对细菌生长的自上而下控制,可能是通过抗生素生产。总之,定量分析提供了对建筑材料微生物生长动态的新见解,对人类健康有潜在影响。综合细胞计数和生物量数据(定量分析)表明,相对丰度的微小变化通常是由绝对丰度的大变化引起的,而相对丰度的负相关可以用仅一组细菌或真菌的快速生长来解释。细菌-细菌和真菌-细菌网络的比较表明真菌对细菌生长的自上而下控制,可能是通过抗生素生产。总之,定量分析提供了对建筑材料微生物生长动态的新见解,对人类健康有潜在影响。综合细胞计数和生物量数据(定量分析)表明,相对丰度的微小变化通常是由绝对丰度的大变化引起的,而相对丰度的负相关可以用仅一组细菌或真菌的快速生长来解释。细菌-细菌和真菌-细菌网络的比较表明真菌对细菌生长的自上而下控制,可能是通过抗生素生产。总之,定量分析提供了对建筑材料微生物生长动态的新见解,对人类健康有潜在影响。细菌-细菌和真菌-细菌网络的比较表明真菌对细菌生长的自上而下控制,可能是通过抗生素生产。总之,定量分析提供了对建筑材料微生物生长动态的新见解,对人类健康有潜在影响。细菌-细菌和真菌-细菌网络的比较表明真菌对细菌生长的自上而下控制,可能是通过抗生素生产。总之,定量分析提供了对建筑材料微生物生长动态的新见解,对人类健康有潜在影响。
更新日期:2020-08-05
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