Phytoplankton-Mediated Redox Cycle of Iron in the Epilimnion of Lake Kinneret (original) (raw)

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The Dynamic Redox Chemistry of Iron in the Epilimnion of Lake Kinneret (Sea of Galilee) Cover Page

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Biogeochemistry of iron in an acidic lake Cover Page

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The biogeochemical cycle of iron and associated elements in Lake Kinneret 1,2 1 Associate editor: M. L. Machesky 2 See Electronic Annex (Elsevier Web site; Science Direct) Cover Page

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The biogeochemical cycle of iron and associated elements in Lake Kinneret Cover Page

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Iron oxidation kinetics in an acidic alpine lake Cover Page

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Determining the Effect of pH on Iron Oxidation Kinetics in Aquatic Environments: Exploring a Fundamental Chemical Reaction To Grasp the Significant Ecosystem Implications of Iron Bioavailability Cover Page

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A chemical method for estimating the availability of iron to phytoplankton in seawater Cover Page

Microbial Iron(II) Oxidation in Littoral Freshwater Lake Sediment: The Potential for Competition between Phototrophic vs. Nitrate-Reducing Iron(II)-Oxidizers

Frontiers in microbiology, 2012

The distribution of neutrophilic microbial iron oxidation is mainly determined by local gradients of oxygen, light, nitrate and ferrous iron. In the anoxic top part of littoral freshwater lake sediment, nitrate-reducing and phototrophic Fe(II)-oxidizers compete for the same e(-) donor; reduced iron. It is not yet understood how these microbes co-exist in the sediment and what role they play in the Fe cycle. We show that both metabolic types of anaerobic Fe(II)-oxidizing microorganisms are present in the same sediment layer directly beneath the oxic-anoxic sediment interface. The photoferrotrophic most probable number counted 3.4·10(5) cells·g(-1) and the autotrophic and mixotrophic nitrate-reducing Fe(II)-oxidizers totaled 1.8·10(4) and 4.5·10(4) cells·g(-1) dry weight sediment, respectively. To distinguish between the two microbial Fe(II) oxidation processes and assess their individual contribution to the sedimentary Fe cycle, littoral lake sediment was incubated in microcosm exper...

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Microbial Iron(II) Oxidation in Littoral Freshwater Lake Sediment: The Potential for Competition between Phototrophic vs. Nitrate-Reducing Iron(II)-Oxidizers Cover Page

High spatial resolution of distribution and interconnections between Fe- and N-redox processes in profundal lake sediments

Environmental microbiology, 2014

The Fe and N biogeochemical cycles play key roles in freshwater environments. We aimed to determine the spatial positioning and interconnections of the N and Fe cycles in profundal lake sediments. The gradients of O2, NO3(-), NH4(+), pH, Eh, Fe(II) and Fe(III) were determined and the distribution of microorganisms was assessed by most probable numbers and quantitative polymerase chain reaction. The redox zones could be divided into an oxic zone (0-8 mm), where microaerophiles (Gallionellaceae) were most abundant at a depth of 7 mm. This was followed by a denitrification zone (6-12 mm), where NO3(-)-dependent Fe(II) oxidizers and organoheterotrophic denitrifiers both reduce nitrate. Lastly, an iron redox transition zone was identified at 12.5-22.5 mm. Fe(III) was most abundant above this zone while Fe(II) was most abundant beneath. The high abundance of poorly crystalline iron suggested iron cycling. The Fe and N cycles are biologically connected through nitrate-reducing Fe(II) oxidi...

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High spatial resolution of distribution and interconnections between Fe- and N-redox processes in profundal lake sediments Cover Page

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Emmerich2012 abundance-distribution-and activity of fe(ii)-oxidizing and fe(iii)-reducing microorganisms in hypersaline lake kasin Cover Page