It has been demonstrated that continuous measurements of E h are valuable for tracking bacterial metabolic activities in liquid cultures (e.g. Increasing evidence suggests that bacteria are capable of creating redox conditions which are visible as species-specific continuous E h measurements (Brasca et al. This outcome suggests that bacterial metabolism and inherent relative contributions of members of bacterial community principally determine development of E h in sediment systems and that quantitation of sediment electrochemical properties may offer a potential indicator that characterizes bacterial processes. Formalin treatment reduced temporal variability of E h in sediment microcosms. The tested bacterial species ( Micrococcus luteus, Paracoccus pantotrophus and Aminobacter aminovarans) appeared to have specific stable E h signals during linear-exponential growth phase, suggesting that these species are capable of exerting an extracellular control on E h measurements, thereby supporting the notion that species-specific E h signals may be widespread among bacterial species. To this end, continuous E h measurements are linked to growth of bacteria in liquid cultures and bacterial metabolic activity in aquatic sediment microcosms containing the bioturbator Tubifex spp., in which we evaluate bacterial partitioning in microcosms treated with the bacteriocide formalin. The purpose of this study is therefore to evaluate whether bacteria that naturally occur in sediments have the capacity to control E h and assess the relative partitioning of biological processes involved in E h in natural sediments. However, it remains uncertain whether this phenomenon is widespread among bacterial species and whether E h measurements reflect similar mechanisms in more complex systems such as soils and sediments. It has been demonstrated that continuous measurements of E h are valuable for tracking bacterial metabolic activities of bacterial species in liquid cultures. Increasing evidence suggests that bacteria are capable of creating specific redox conditions which are visible as species-specific continuous redox potential ( E h) measurements.
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