Comparative Survival Analysis ofDeinococcus radioduransand the HaloarchaeaNatrialba magadiiandHaloferax volcaniiExposed to Vacuum Ultraviolet Irradiation

Abrevaya, Ximena C.; Paulino-Lima, Ivan G.; Galante, Douglas; Rodrigues, Fábio; Mauas, P. J. D.; Cortón, Eduardo; Lage, Claudia

doi:10.1089/ast.2011.0607

Cited by 28 publications

(31 citation statements)

References 47 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…dehydration, vacuum, solar wind charged particles, shielding no survival after 1kGy of 200keV protons (Paulino-Lima et al, 2010a) N. magadii dehydration, vacuum, VUV, unshielded 0.1% survival after 1.3kJ•m -2 VUV (Abrevaya et al, 2011) H. volcanii dehydration, vacuum, VUV, unshielded…”

Section: Discussionmentioning

confidence: 99%

Mini-Review: Probing the limits of extremophilic life in extraterrestrial environment-simulated experiments

Lage

Dalmaso

Teixeira

et al. 2012

International Journal of Astrobiology

Self Cite

View full text Add to dashboard Cite

Astrobiology is a brand new area of science that seeks to understand the origin and dynamics of life in the universe. Several hypotheses to explain life in the cosmic context have been developed throughout human history, but only now technology has allowed many of them to be tested. Laboratory experiments have been able to show how chemical elements essential to life, carbon, nitrogen, oxygen and hydrogen combine in biologically important compounds. Interestingly, these compounds are found universally. As these compounds were combined to the point of originating cells and complex organisms is still a challenge to be unveiled by science. However, our 4.5 billion years-old solar system was born within a 10-billion years-old universe. Thus, simple cells like microorganisms may have had time to form in planets older than ours or other suitable molecular places in the universe. One hypothesis to explain the origin of life on Earth is called panspermia, which predicts that microbial life could have been formed in the universe billions of years ago, traveling between planets, and inseminating units of life that could have become more complex in habitable planets like ours. A project designed to test viability of extremophile microorganisms exposed to simulated extraterrestrial environments is ongoing at the Carlos Chagas Filho Institute of Biophysics to test whether microbial life could withstand those inhospitable environments. Ultra-resistant (known or novel ones) microorganisms collected from terrestrial extreme environments, extremophiles, have been exposed to intense radiation sources simulating solar radiation (synchrotron accelerators), capable of emitting in a few hours radiation equivalent of million years accumulated doses. The results obtained in these experiments have revealed a remarkable resistance of extremophilic bacteria and archaea against different radiation sources (VUV, solar wind simulants, X rays) whenever protected by microsized carbonaceus grains. Altogether, the collected data suggest the interesting possibility of the existence of microbial life beyond Earth and its transfer among habitable bodies, which we have called microlithopanspermia.

show abstract

Section: Discussionmentioning

confidence: 99%

Mini-Review: Probing the limits of extremophilic life in extraterrestrial environment-simulated experiments

Lage

Dalmaso

Teixeira

et al. 2012

International Journal of Astrobiology

Self Cite

View full text Add to dashboard Cite

show abstract

“…magadii survived exposure to high vacuum for 1 h better than Deinococcus. Following doses of synchrotron radiation up to 150 J m −2 (57.6-200 nm), the two archaea survived as well as Deinococcus, but at higher doses, the archaea performed less well [39,40].…”

Section: The Halobacteriaceae As Model Organisms and The Properties Tmentioning

confidence: 99%

Halophilic archaea on Earth and in space: growth and survival under extreme conditions

Oren¹

2014

Phil. Trans. R. Soc. A.

View full text Add to dashboard Cite

Salts are abundant on Mars, and any liquid water that is present or may have been present on the planet is expected to be hypersaline. Halophilic archaea (family Halobacteriaceae) are the microorganisms best adapted to life at extremes of salinity on Earth. This paper reviews the properties of the Halobacteriaceae that may make the group good candidates for life also on Mars. Many species resist high UV and gamma radiation levels; one species has survived exposure to vacuum and radiation during a space flight; and there is at least one psychrotolerant species. Halophilic archaea may survive for millions of years within brine inclusions in salt crystals. Many species have different modes of anaerobic metabolism, and some can use light as an energy source using the light-driven proton pump bacteriorhodopsin. They are also highly tolerant to perchlorate, recently shown to be present in Martian soils, and some species can even use perchlorate as an electron acceptor to support anaerobic growth. The presence of characteristic carotenoid pigments ( α -bacterioruberin and derivatives) makes the Halobacteriaceae easy to identify by Raman spectroscopy. Thus, if present on Mars, such organisms may be detected by Raman instrumentation planned to explore Mars during the upcoming ExoMars mission.

show abstract

“…It has been shown that some haloarchaea display features related to resistance to drying or even to vacuum (Kottemann et al, 2005;Abrevaya et al, 2011a). It has also been observed that organisms that are resistant to dehydration are also resistant to different temperatures (Coker et al, 2007) and to the effects of ionizing radiation (Crowe and Crowe, 1992;Kottemann et al, 2005;Whitehead et al, 2006;DeVeaux et al, 2007).…”

Section: Natural Habitatsmentioning

confidence: 99%

“…Because they are exposed to intense solar ultraviolet (UV) radiation, haloarchaea are also recognized as UV tolerant: adapted to various regimes and types of UV irradiation (Baliga et al, 2004, McCready et al, 2005Abrevaya et al, 2009Abrevaya et al, , 2011a. They have also shown resistance to transition metals (Zn, Cu, Ni, Co, Mn, and Fe) through an oxidative stress response .…”

Section: Natural Habitatsmentioning

confidence: 99%

Features and Applications of Halophilic Archaea

Abrevaya

2012

Extremophiles

Self Cite

View full text Add to dashboard Cite

Comparative Survival Analysis ofDeinococcus radioduransand the HaloarchaeaNatrialba magadiiandHaloferax volcaniiExposed to Vacuum Ultraviolet Irradiation

Abstract: The haloarchaea Natrialba magadii and Haloferax volcanii, as well as the radiation-resistant bacterium Deinococcus radiodurans, were exposed to vacuum-UV (V-UV) radiation at the Brazilian Synchrotron Light Laboratory

Cited by 28 publications

References 47 publications

Mini-Review: Probing the limits of extremophilic life in extraterrestrial environment-simulated experiments

Mini-Review: Probing the limits of extremophilic life in extraterrestrial environment-simulated experiments

Halophilic archaea on Earth and in space: growth and survival under extreme conditions

Features and Applications of Halophilic Archaea

Contact Info

Product

Resources

About