Anoxia: Evidence for Eukaryote Survival and Paleontological Strategies (Cellular Origin, Life in Extreme Habitats and Astrobiology #21)
Sciences et technologies, Dinosaures
Audio avec voix de synthèse, Braille automatisé
Résumé
ANOXIA defines the lack of free molecular oxygen in an environment In the presence of organic matter anaerobic prokaryotes produce compounds such as free radicals hydrogen sulfide or methane that are typically toxic to aerobes … The concomitance of suppressed respiration and presence of toxic substances suggests these habitats are inhospitable to Eukaryota Ecologists sometimes term such environments Death Zones This book presents however a collection of remarkable adaptations to anoxia observed in Eukaryotes such as protists animals plants and fungi Case studies provide evidence for controlled beneficial use of anoxia by for example modification of free radicals use of alternative electron donors for anaerobic metabolic pathways and employment of anaerobic symbionts The complex interwoven existence of oxic and anoxic conditions in space and time is also highlighted as is the idea that eukaryotic inhabitation of anoxic habitats was established early in Earth history