Physiology and application of sulfur-reducing microorganisms from acidic environments

PhD defence

Physiology and application of sulfur-reducing microorganisms from acidic environments

PhD candidate AP (Anna) Florentino de Souza Silva
Promotor prof.dr.ir. AJM (Fons) Stams
Co-promotor dr I Sanchez Andrea
dr ir J Weijma
Organisation Wageningen University & Research, Laboratory of Microbiology
Date

Tue 21 March 2017 13:30 to 15:00

Venue Auditorium, building number 362
Generaal Foulkesweg 1
362
6703 BG
Wageningen
0317-483592

Summary

Metallurgical industries commonly release large amounts of dissolved heavy metals in the environment, which is harmful for the living organisms. Sulfur-reducing prokaryotes are of great interest to bioremediate such environments, as sulfide is the main product of their activity. We explored the microbiological suitability of acidophilic sulfur reduction for metal recovery by enriching sulfur reducers from sediments of an extreme acidic environment (Tinto river), which resulted in the isolation of novel acidotolerant microorganisms  called Desulfurella amilsii and Lucifera butyrica. The thesis gives insight into the metabolism of sulfur respiration and at the possibilities of biotechnological application of both isolates at their optimal conditions for growth and at acidic conditions.