The hydrogen hypothesis for the first eukaryote

Article Abstract:

A theory for the origins of eukaryotic cells has been developed around the symbiotic relationship of an anaerobic hydrogen dependant host archaebacterium and a symbiont eubacterium that generated waste hydrogen. Similar anaerobic relationships can be seen in deep sea sediments. The suggested mechanism is of a host existing in an anaerobic environment suddenly being removed from that environment and becoming totally dependant on the symbiont for survival. Hydrogen dependancy in the host is driven by the mechanism that generates ATP.

Biochemistry, Research and Development in the Physical, Engineering, and Life Sciences, Eukaryotic cells, Cells (Biology), Eukaryotes

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Mediation of pathogen resistance by exudation of antimicrobials from roots

Article Abstract:

A study shows that the exudation of root-derived antimicrobial metabolites by Arabidopsis thaliana confers tissue-specific resistance to a wide range of bacterial pathogens. However, a Pseudomonas syringae strain that is both at least partly resistant to these compounds and capable of blocking their synthesis or exudation is able to infect the roots and cause disease.

United States, Study and teaching, Plant disease control

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Mitochondrial remnant organelles of Giardia function in iron-sulphur protein maturation

Article Abstract:

Giardia contains mitochondrial remnant organelles bounded by double membranes that function in iron-sulphur protein maturation. Giardia is not primitively amitochondrial and has retained a functional organelle derived from the original mitochondrial endosymbiont.

Giardia, Giardia lamblia

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