INVESTIGADORES
CORTON Eduardo
congresos y reuniones científicas
Título:
The UV Limits of Life: An Experiment With Halophile Archaea
Autor/es:
ABREVAYA X. C.; EDUARDO CORTON; MAUAS P. J. D.
Lugar:
Seattle, Washington
Reunión:
Congreso; Astrobiology Graduate Student Conference (AbGradCon); 2009
Resumen:
Diapositiva 1
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UV-C
RADIATION FROM M-STARS AND HABITABILITY ON EXTRASOLAR PLANETS
Introduction
dMe stars emit large amounts of UV
radiation during flares
UV is a genotoxic agent: could
trigger cell death, should also be considered in habitability criteria.
BIOLOGICAL EFFECTS
Setting the
limits of life: extremophile organisms are important in astrobiology
because survive in extreme
physicochemical environmental conditions
Poly-extremophile microorganism: Natrialba
magadii (Magadi lake, Kenya, Africa).
Archaea. Halophile and Alkaliphile (requirements: 2.0- 5.2 M NaCl and pH 9.5 for optimal
growth)
Irradiation on N. magadii : irradiance of the same order to
those received from a weak flare, such as those detected in EV-Lac (3.7 W m-2)
. We worked at different doses.
Preliminary results show that even
after significant UV damage, as judged by the absence of detectable growth for
more than 30 h, the surviving cells were able to resume growth with nearly
normal kinetics at all doses analyzed.
