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Life in extreme environments
Critically what it means to be an extremophile is examined, and the implications for evolution, biotechnology and especially the search for life in the Universe are examined.
The data support the likelihood of interplanetary transfer of microorganisms within meteorites, the so-called lithopanspermia hypothesis.
Martian soil and UV radiation: microbial viability assessment on spacecraft surfaces
Survival of endospores of Bacillus subtilis on spacecraft surfaces under simulated martian environments: implications for the forward contamination of Mars.
The evolution of nitrogen cycling
It is suggested that denitrification arose prior to aerobic respiration and that nitrification arose after the advent of an aerobic atmosphere, and for the first time that HNO, predicted to be the main product of atmospheric photochemical reactions involving NO on the primitive Earth by photochemical models, would eventually become NO2− and NO3− after reaching the Earth's surface.
The impact and recovery of asteroid 2008 TC3
A dedicated search along the approach trajectory recovered 47 meteorites, fragments of a single body named Almahata Sitta, with a total mass of 3.95 kg, identifying the asteroid as F class, now firmly linked to dark carbon-rich anomalous ureilites, a material so fragile it was not previously represented in meteorite collections.
METABOLIC ACTIVITY OF MICROORGANISMS IN EVAPORITES 1
- L. Rothschild, L. Giver, M. R. White, R. Mancinelli
- Environmental ScienceJournal of phycology
- 1 June 1994
Evidence is presented that prokaryotes inhabiting a natural evaporite crust of halite and gypsum are metabolically active while inside the evaporite for at least 10 months, suggesting the possibility that microorganisms found in ancient evaporite deposits may have been part of an evaporite community.
The regulation of methane oxidation in soil.
- R. Mancinelli
- Environmental ScienceAnnual review of microbiology
Obtaining a better understanding of the ecology of methanotrophs will help elucidate the mechanisms that regulate soil methane oxidation, and help identify the factors influencing the flux of methane into the atmosphere.
The influence of pocket gophers on the status of nutrients in Alpine soils
A reappraisal of the habitability of planets around M dwarf stars.
It is concluded that M dwarf stars may indeed be viable hosts for planets on which the origin and evolution of life can occur and it makes sense to include M dwarfs in programs that seek to find habitable worlds and evidence of life.