One benefit of phenazine-mediated iron reduction is the increased bioavailability of this limited element to the bacterium.
Such an association does not indicate the bioavailability of these elements, although this may possibly be inferred from knowledge of the susceptibility of particular minerals to decomposition during weathering.
This occurrence can be an index of the different bioavailability of an element series present in PM2.5 fraction compared to PM10 fraction.
In fact, the plant bioavailability of each trace element depends on its reaction with various soil components and the chemical behavior of that element in soil.
The bioavailability of each respective element also depends significantly on factors such as solubility, chemical speciation (for example, Fe2+ and Fe3+), pH, ionic strength, inorganic anions, chelates or interaction with other elements (for example, the formation of Ca3(precipitatesitates).
The developed procedure was applied to evaluate the bioavailability of both elements in four sediment certified reference materials, in which there are not certified values for bioavailable fractions, and also in estuarine sediment samples collected in several sites of Guanabara Bay, an impacted environment in Rio de Janeiro, Brazil.
Numerous authors have used in vitro systems to estimate the bioavailability of inorganic elements.
According to results of our investigation, chickpea genotypes with P phy < 2.5 mg g−1, such as C2, C3, C9, and C10 landraces, could be used for breeding program for further phytate decrease, i.e., increased bioavailability of mineral elements.
Sulphide is not only toxic to various microbial populations, but also forms complexes with metals, which can decrease the bioavailability of trace elements essential for microbial activity [ 6, 8].
High pressure and low temperatures might influence the bioavailability of toxic elements, she says, and deep-sea species may be either less or more susceptible to plume toxicity than species in shallower waters.
