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100 kGy gamma-affected microbial communities within the ancient Arctic permafrost under simulated Martian conditions

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      MEGA6: Molecular Evolutionary Genetics Analysis version 6.0.

      We announce the release of an advanced version of the Molecular Evolutionary Genetics Analysis (MEGA) software, which currently contains facilities for building sequence alignments, inferring phylogenetic histories, and conducting molecular evolutionary analysis. In version 6.0, MEGA now enables the inference of timetrees, as it implements the RelTime method for estimating divergence times for all branching points in a phylogeny. A new Timetree Wizard in MEGA6 facilitates this timetree inference by providing a graphical user interface (GUI) to specify the phylogeny and calibration constraints step-by-step. This version also contains enhanced algorithms to search for the optimal trees under evolutionary criteria and implements a more advanced memory management that can double the size of sequence data sets to which MEGA can be applied. Both GUI and command-line versions of MEGA6 can be downloaded from www.megasoftware.net free of charge.
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        THE POPULATION FREQUENCIES OF SPECIES AND THE ESTIMATION OF POPULATION PARAMETERS

         I. GOOD (1953)
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          Resistance of Bacillus endospores to extreme terrestrial and extraterrestrial environments.

          Endospores of Bacillus spp., especially Bacillus subtilis, have served as experimental models for exploring the molecular mechanisms underlying the incredible longevity of spores and their resistance to environmental insults. In this review we summarize the molecular laboratory model of spore resistance mechanisms and attempt to use the model as a basis for exploration of the resistance of spores to environmental extremes both on Earth and during postulated interplanetary transfer through space as a result of natural impact processes.
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            Author and article information

            Journal
            Extremophiles
            Extremophiles
            Springer Nature
            1431-0651
            1433-4909
            November 2017
            October 9 2017
            : 21
            : 6
            : 1057-1067
            10.1007/s00792-017-0966-7
            © 2017

            http://www.springer.com/tdm

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