Effect of metal complexation on the bioavailability of nitrilotriacetic acid to Chelatobacter heintzii ATCC 29600

White, Victoria E.; Knowles, Christopher J.

doi:10.1007/s002030000157

Cited by 20 publications

(8 citation statements)

References 33 publications

(40 reference statements)

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“…Insoluble Fe(oxy)hydroxides, like other mineral surfaces, can bind OM [ Hedges and Oades , ; Baldock and Skjemstad , ; Kaiser and Guggenberger , , ; Chan et al , ; Bennett et al , ]. The adsorption of OM on mineral surfaces reduces the availability of OM for osmotrophic microbes (archaea, bacteria, and fungi) and can result in the long‐term preservation of OM [ Keil et al , ; Hedges and Keil , ; White and Knowles , ; Rothman and Forney , ; Lalonde et al , ].…”

Section: Introductionmentioning

confidence: 99%

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The effect of iron on the biodegradation of natural dissolved organic matter

Xiao

Hoikkala²,

Kasurinen

et al. 2016

JGR Biogeosciences

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Iron (Fe) may alter the biodegradation of dissolved organic matter (DOM), by interacting with DOM, phosphorus (P), and microbes. We isolated DOM and a bacterial community from boreal lake water and examined bacterial growth on DOM in laboratory experiments. Fe was introduced either together with DOM (DOM‐Fe) or into bacterial suspension, which led to the formation of insoluble Fe precipitates on bacterial surfaces (Fe coating). In the latter case, the density of planktonic bacteria was an order of magnitude lower than that in the corresponding treatment without introduced Fe. The association of Fe with DOM decreased bacterial growth, respiration, and growth efficiency compared with DOM alone at the ambient concentration of dissolved P (0.16 µmol L−1), indicating that DOM‐associated Fe limited the bioavailability of P. Under a high concentration (21 µmol L−1) of P, bacterial biomass and respiration were similar or several times higher in the treatment where DOM was associated with Fe than in a corresponding treatment without Fe. Based on the next generation sequencing of 16S rRNA genes, Caulobacter dominated bacterial communities grown on DOM‐Fe. This study demonstrated that association of Fe with a bacterial surface or P reduces bacterial growth and the consumption of DOM. In contrast, DOM‐Fe is bioavailable and bound Fe can even stimulate bacterial growth on DOM when P is not limiting.

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Section: Introductionmentioning

confidence: 99%

“…These associations ranging from monomeric complexes between Fe and DOM to colloidal assemblages of DOM and Fe are called collectively as DOM‐Fe in this study. The biodegradation of organic component in DOM‐Fe is poorly known [ Boudot et al , ; White and Knowles , ; Nancharaiah et al , ].…”

Section: Introductionmentioning

confidence: 99%

The effect of iron on the biodegradation of natural dissolved organic matter

Xiao

Hoikkala²,

Kasurinen

et al. 2016

JGR Biogeosciences

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“…The effect of growth versus non growth conditions on the aggregation of bioreduced U particles in the aqueous phase was investigated in the presence of bicarbonate buffer because bicarbonate is a natural buffer commonly present at various U contaminated sites (Bargar et al 2008;Sani et al 2006;White and Knowles 2000). The comparison of the transmission electron microscopy (TEM) images of D. Alaskensis G20 culture under non-growth ( Fig.…”

Section: Resultsmentioning

confidence: 99%

Impact of different environmental conditions on the aggregation of biogenic U(IV) nanoparticles synthesized by Desulfovibrio alaskensis G20

et al. 2016

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This study investigates the impact of specific environmental conditions on the formation of colloidal U(IV) nanoparticles by the sulfate reducing bacteria (SRB, Desulfovibrio alaskensis G20). The reduction of soluble U(VI) to less soluble U(IV) was quantitatively investigated under growth and non-growth conditions in bicarbonate or 1,4-piperazinediethanesulfonic acid (PIPES) buffered environments. The results showed that under non-growth conditions, the majority of the reduced U nanoparticles aggregated and precipitated out of solution. High resolution transmission electron microscopy revealed that only a very small fraction of cells had reduced U precipitates in the periplasmic spaces in the presence of PIPES buffer, whereas in the presence of bicarbonate buffer, reduced U was also observed in the cytoplasm with greater aggregation of biogenic U(IV) particles at higher initial U(VI) concentrations. The same experiments were repeated under growth conditions using two different electron donors (lactate and pyruvate) and three electron acceptors (sulfate, fumarate, and thiosulfate). In contrast to the results of the non-growth experiments, even after 0.2 μm filtration, the majority of biogenic U(IV) remained in the aqueous phase resulting in potentially mobile biogenic U(IV) nanoparticles. Size fractionation results showed that U(IV) aggregates were between 18 and 200 nm in diameter, and thus could be very mobile. The findings of this study are helpful to assess the size and potential mobility of reduced U nanoparticles under different environmental conditions, and would provide insights on their potential impact affecting U(VI) bioremediation efforts at subsurface contaminated sites.

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“…Consequently, the high phosphate concentration may have resulted in phosphate-metal binding, causing a decrease in the concentration of bioavailable metals and an increase in the 1,2-DCA biodegradation rate. Phosphate readily sequesters metals and diminishes their bioavailability via the configuration of insoluble metal phosphate species and has been used as a metalcomplexing agent in some studies to reduce free ionic metal concentrations [26]. In this study, heavy metal concentrations ranging from 0.01 to 0.3 mM were examined for their inhibitory effects on 1,2-DCA biodegradation.…”

Section: Discussionmentioning

confidence: 99%

Kinetics of heavy metal inhibition of 1,2‐dichloroethane biodegradation in co‐contaminated water

Arjoon

Olaniran

Pillay

2013

J. Basic Microbiol.

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Sites co-contaminated with heavy metals and 1,2-DCA may pose a greater challenge for bioremediation, as the heavy metals could inhibit the activities of microbes involved in biodegradation. Therefore, this study was undertaken to quantitatively assess the effects of heavy metals (arsenic, cadmium, mercury, and lead) on 1,2-DCA biodegradation in co-contaminated water. The minimum inhibitory concentrations (MICs) and concentrations of the heavy metals that caused half-life doubling (HLDs) of 1,2-DCA as well as the degradation rate coefficient (k(1)) and half-life (t(½)) of 1,2-DCA were measured and used to predict the toxicity of the heavy metals in the water microcosms. An increase in heavy metal concentration resulted in a progressive increase in the t(½) and relative t(½) and a decrease in k(1). The MICs and HLDs of the heavy metals were found to vary, depending on the heavy metals type. In addition, the presence of heavy metals was shown to inhibit 1,2-DCA biodegradation in a dose-dependent manner, with the following order of decreasing inhibitory effect: Hg(2+) > As(3+) > Cd(2+) > Pb(2+). Findings from this study have significant implications for the development of bioremediation strategies for effective degradation of 1,2-DCA and other related compounds in wastewater co-contaminated with heavy metals.

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Effect of metal complexation on the bioavailability of nitrilotriacetic acid to Chelatobacter heintzii ATCC 29600

Cited by 20 publications

References 33 publications

The effect of iron on the biodegradation of natural dissolved organic matter

The effect of iron on the biodegradation of natural dissolved organic matter

Impact of different environmental conditions on the aggregation of biogenic U(IV) nanoparticles synthesized by Desulfovibrio alaskensis G20

Kinetics of heavy metal inhibition of 1,2‐dichloroethane biodegradation in co‐contaminated water

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