Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1038/ismej.2011.46 |
Exposure of phototrophs to 548 days in low Earth orbit: microbial selection pressures in outer space and on early earth | |
Cockell, Charles S.1; Rettberg, Petra2; Rabbow, Elke2; Olsson-Francis, Karen1 | |
通讯作者 | Cockell, Charles S. |
来源期刊 | ISME JOURNAL
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ISSN | 1751-7362 |
EISSN | 1751-7370 |
出版年 | 2011 |
卷号 | 5期号:10页码:1671-1682 |
英文摘要 | An epilithic microbial community was launched into low Earth orbit, and exposed to conditions in outer space for 548 days on the European Space Agency EXPOSE-E facility outside the International Space Station. The natural phototroph biofilm was augmented with akinetes of Anabaena cylindrica and vegetative cells of Nostoc commune and Chroococcidiopsis. In space-exposed dark controls, two algae (Chlorella and Rosenvingiella spp.), a cyanobacterium (Gloeocapsa sp.) and two bacteria associated with the natural community survived. Of the augmented organisms, cells of A. cylindrica and Chroococcidiopsis survived, but no cells of N. commune. Only cells of Chroococcidiopsis were cultured from samples exposed to the unattenuated extraterrestrial ultraviolet (UV) spectrum (>110 nm or 200 nm). Raman spectroscopy and bright-field microscopy showed that under these conditions the surface cells were bleached and their carotenoids were destroyed, although cell morphology was preserved. These experiments demonstrate that outer space can act as a selection pressure on the composition of microbial communities. The results obtained from samples exposed to >200 nm UV (simulating the putative worst-case UV exposure on the early Earth) demonstrate the potential for epilithic colonization of land masses during that time, but that UV radiation on anoxic planets can act as a strong selection pressure on surface-dwelling organisms. Finally, these experiments have yielded new phototrophic organisms of potential use in biomass and oxygen production in space exploration. The ISME Journal (2011) 5, 1671-1682; doi:10.1038/ismej.2011.46; published online 19 May 2011 |
英文关键词 | algae bacteria cyanobacteria epilith low Earth orbit space exploration |
类型 | Article |
语种 | 英语 |
国家 | England ; Germany |
收录类别 | SCI-E |
WOS记录号 | WOS:000295783200012 |
WOS关键词 | BACILLUS-SUBTILIS SPORES ; UV-RADIATION CLIMATE ; COLI PLASMID PUC19 ; ULTRAVIOLET-RADIATION ; CYANOBACTERIUM CHROOCOCCIDIOPSIS ; VACUUM UV ; DESICCATION ; COMMUNITY ; DESERT ; ALGAE |
WOS类目 | Ecology ; Microbiology |
WOS研究方向 | Environmental Sciences & Ecology ; Microbiology |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/168720 |
作者单位 | 1.Open Univ, CEPSAR, Milton Keynes MK6 3AD, Bucks, England; 2.DLR, Inst Aerosp Med, Cologne, Germany |
推荐引用方式 GB/T 7714 | Cockell, Charles S.,Rettberg, Petra,Rabbow, Elke,et al. Exposure of phototrophs to 548 days in low Earth orbit: microbial selection pressures in outer space and on early earth[J],2011,5(10):1671-1682. |
APA | Cockell, Charles S.,Rettberg, Petra,Rabbow, Elke,&Olsson-Francis, Karen.(2011).Exposure of phototrophs to 548 days in low Earth orbit: microbial selection pressures in outer space and on early earth.ISME JOURNAL,5(10),1671-1682. |
MLA | Cockell, Charles S.,et al."Exposure of phototrophs to 548 days in low Earth orbit: microbial selection pressures in outer space and on early earth".ISME JOURNAL 5.10(2011):1671-1682. |
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