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Terrestrial microorganisms at an altitude of 20,000 m in Earth's atmosphere

机译:地球大气中海拔20,000 m的陆地微生物

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A joint effort between the U.S. Geological Survey's (USGS) Global Desert Dust and NASA's Stratospheric and Cosmic Dust Programs identified culturable microbes from an air sample collected at an altitude of 20,000 m. A total of 4 fungal (Penicillium sp.) and 71 bacteria colony-forming units (70 colonies of Bacillus luciferensis believed to have originated from a single cell collected at altitude and one colony of Bacillus sphaericus) were enumerated, isolated and identified using a morphological key and 16S rDNA sequencing respectively. All of the isolates identified were spore-forming pigmented fungi or bacteria of terrestrial origin and demonstrate that the presence of viable microorganisms in Earth's upper atmosphere may not be uncommon.
机译:美国地质调查局(USGS)的全球沙漠尘埃计划与NASA的平流层和宇宙尘埃计划共同努力,从在20,000 m高度收集的空气样本中鉴定出可培养的微生物。枚举,分离和鉴定了总共4个真菌(Penicillium sp。)和71个细菌菌落形成单位(据信70个菌落来自高海拔收集的单个细胞和一个球形芽孢杆菌菌落)。关键和16S rDNA测序。鉴定出的所有分离物都是形成孢子的有色真菌或陆生细菌,证明地球上层大气中存在活的微生物可能并不罕见。

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