» Tübingen scientists show iron minerals shield against harmful UV.
Earth in the days when life was just beginning had no protective ozone layer, so light-dependent, iron-oxidizing bacteria formed iron minerals around themselves to protect them from damaging ultraviolet rays. In this way, living beings were able to survive in the rough environment of 3- 4 billion years ago.
This is the conclusion reached by Tübingen geomicrobiologists Tina Gauger and Professor Andreas Kappler following a series of laboratory experiments in collaboration with Professor Kurt Konhauser of the University of Alberta in Edmonton, Canada. The results of this reasearch have been published in the latest issue of Geology.(…) »
A sunshield for iron-oxidizing bacteria: These tiny organisms build their own sun umbrella by forming iron minerals or rust around their cells; this protects them from harmful UV rays. Image: Kappler/Gauger/University of Tübingen
Gauger, T., Konhauser, K.O. & Kappler, A. (2015). Protection of phototrophic iron(II)-oxidizing bacteria from UV radiation by biogenic iron (III) minerals: Implications for early Archean banded iron formation. Geology, Online publication October 23, 2015, DOI 10.1130/G37095.1
Communiqué de Presse Universitaet Tübingen du 26 Octobre 2015, site AlphaGalileo