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Ferric Iron Reduction by Fermentative Strain BS2 Isolated From an Iron-Rich Anoxic Environment (Lake Pavin, France)

2010; Taylor & Francis; Volume: 27; Issue: 8 Linguagem: Inglês

10.1080/01490451003597663

1521-0529

Anne‐Catherine Lehours, Marion Rabiet, Nicole Morel‐Desrosiers, Jean‐Pierre Morel, Lionel Jouve, Brigitte Arbeille, Gilles Mailhot, Gérard Fonty,

Anaerobic Digestion and Biogas Production

Abstract A facultatively Fe-reducing strain BS2 related to Clostridium saccarobutylicum was isolated from the anoxic zone of iron-rich Lake Pavin. A comparative study was performed on the growth, fermentative profile and heat production of BS2 on glucose in presence and absence of Fe(III). Fe(III) availability led to an optimization of glucose uptake and higher maintenance of strain BS2 in the growth media. Given the prevailing conditions (e.g., scarcity of metabolizable organic matter) in the anoxic zone of Lake Pavin, Fe(III) reduction by this facultative Fe(III) reducer may confer ecological benefits to strain BS2. Moreover, in presence of Fe(III), there was a modification of the fermentative balance that may influence the terminal-accepting processes in this layer. Keywords: dissimilatory Fe(III) reductionecologyfermentative strainlacustrine This work was supported by grants from Agence Nationale de la Recherche (Projet Metanox, ANR-05-ECCO-013). Notes aThe oxidation state of carbon atoms was calculated assuming oxidation states of −2 and +1 for oxygen and hydrogen, respectively. bValues calculated as mol produced divided by mol of glucose fermented. cTotal of mol produced. dData in this column were obtained as (mol of product/mol of glucose) × oxidation state of carbon atoms. eCarbon recovery was calculated as (mol of product/mol of glucose) × no. of carbon atoms in the molecule. fHydrogen recovery was calculated as (mol of product/mol of glucose) × no. of hydrogen atoms in the molecule.