Interacting Bioenergetic and Stoichiometric Controls on Microbial Growth DOI Creative Commons
Arjun Chakrawal, Salvatore Calabrese, Anke M. Herrmann

et al.

Frontiers in Microbiology, Journal Year: 2022, Volume and Issue: 13

Published: May 17, 2022

Microorganisms function as open systems that exchange matter and energy with their surrounding environment. Even though mass (carbon nutrients) exchanges are tightly linked, there is a lack of integrated approaches combine these fluxes explore how they jointly impact microbial growth. Such links essential to predicting the growth rate microorganisms varies, especially when stoichiometry carbon- (C) nitrogen (N)-uptake not balanced. Here, we present theoretical framework quantify for conditions C-, N-, energy-(co-) limitations. We use this show C:N ratio degree reduction organic (OM), which also electron donor, availability acceptors (EAs), different sources N together control under C, nutrient, energy-limited conditions. peaks at intermediate values OM oxic C-limited conditions, but N-limited Under N-poor OM, higher inorganic (NInorg)-source ammonium compared nitrate due additional energetic cost involved in reduction. anoxic both EA NInorg-source, rates denitrifiers microbes performing dissimilatory ammonia (DNRA) determined by nitrate-availability. Consistent data, DNRA predicted foster extreme nitrate-limitation reduced whereas favored becomes more available presence oxidized OM. Furthermore, catabolism coupled low yielding EAs (e.g., sulfate) because carbon efficiency (CUE). However, CUE decreases nutrient demand growth, thereby reducing N-limitation. conclude bioenergetics provides useful conceptual explaining metabolisms multiple resource-limitations.

Language: Английский

Consider the Anoxic Microsite: Acknowledging and Appreciating Spatiotemporal Redox Heterogeneity in Soils and Sediments DOI Creative Commons
Emily M. Lacroix, Meret Aeppli, Kristin Boye

et al.

ACS Earth and Space Chemistry, Journal Year: 2023, Volume and Issue: 7(9), P. 1592 - 1609

Published: Aug. 23, 2023

Reduction-oxidation (redox) reactions underlie essentially all biogeochemical cycles. Like most soil properties and processes, redox is spatiotemporally heterogeneous. However, unlike other features, heterogeneity has yet to be incorporated into mainstream conceptualizations of biogeochemistry. Anoxic microsites, the defining feature in bulk oxic soils sediments, are zones oxygen depletion otherwise environments. In this review, we suggest that anoxic microsites represent a critical component function appreciating promises advance our understanding sediment sections 1 2, define highlight their dynamic properties, specifically microsite distribution, gradient magnitude, temporality. section 3, describe influence on several key elemental cycles, organic carbon, nitrogen, iron, manganese, sulfur. 4, evaluate methods for identifying characterizing 5, past current approaches modeling microsites. Finally, 6, steps incorporating heterogeneities more broadly sediments.

Language: Английский

Citations

40
Electron Transfer, Atom Exchange, and Transformation of Iron Minerals in Soils: The Influence of Soil Organic Matter DOI Open Access
Chunmei Chen,

Yanjun Dong,

Aaron Thompson

et al.

Environmental Science & Technology, Journal Year: 2023, Volume and Issue: 57(29), P. 10696 - 10707

Published: July 14, 2023

Despite substantial experimental evidence of electron transfer, atom exchange, and mineralogical transformation during the reaction Fe(II)aq with synthetic Fe(III) minerals, these processes are rarely investigated in natural soils. Here, we used an enriched Fe isotope approach Mössbauer spectroscopy to evaluate how soil organic matter (OM) influences Fe(II)/Fe(III) transfer exchange surface soils collected from Luquillo Calhoun Experimental Forests this might affect mineral composition. Following 57Fe-enriched for 33 days, spectra demonstrated marked between sorbed Fe(II) underlying oxides Comparing untreated OM-removed indicates that OM largely attenuated goethite, whereas ferrihydrite was unaffected. Soil also reduced extent exchange. no measurable changes were found high-crystallinity while did drive increase oxide crystallinity LCZO having low-crystallinity goethite. However, presence inhibited Fe(II)-catalyzed increases soil. appears be commonplace exposed anoxic conditions, but its resulting Fe(II)-induced recrystallization depend strongly on content existing phases.

Language: Английский

Citations

35
Transformational fixation of Cr(VI) during microwave-enhanced reduction of soil iron minerals by tea polyphenols DOI

Yuliang Tu,

Jianle Wang,

Yan‐Feng Huang

et al.

Journal of Environmental Management, Journal Year: 2025, Volume and Issue: 379, P. 124889 - 124889

Published: March 9, 2025

Language: Английский

Citations

1
How do phytogenic iron oxide nanoparticles drive redox reactions to reduce cadmium availability in a flooded paddy soil? DOI

Jiajiang Lin,

Fengxin He,

Gary Owens

et al.

Journal of Hazardous Materials, Journal Year: 2020, Volume and Issue: 403, P. 123736 - 123736

Published: Aug. 18, 2020

Language: Английский

Citations

58
A promising destiny for Feammox: From biogeochemical ammonium oxidation to wastewater treatment DOI

Jiaxuan Zhu,

Tian Li, Chengmei Liao

et al.

The Science of The Total Environment, Journal Year: 2021, Volume and Issue: 790, P. 148038 - 148038

Published: May 26, 2021

Language: Английский

Citations

52
Reactive iron, not fungal community, drives organic carbon oxidation potential in floodplain soils DOI Creative Commons
Hannah Naughton, Bradley B. Tolar, Christian Dewey

et al.

Soil Biology and Biochemistry, Journal Year: 2023, Volume and Issue: 178, P. 108962 - 108962

Published: Jan. 19, 2023

Wetlands host ∼20% of terrestrial organic carbon and serve as a major sink for atmospheric carbon. Anoxic soils sediments accrue soil (SOC) partly by hampering the activity extracellular oxidative enzymes that break down phenolic polymers. Upon aeration, fungal-driven enzymatic depolymerization microbial respiration released monomers ensue. Redox-active metals can simultaneously catalyze abiotic nonspecific oxidation SOC, notable examples including Mn(III) or Fe(II) through Fenton-like, hydrogen peroxide-catalyzed radical production. However, extent reactive metal contributions to biotic SOC degradation is not understood in context natural environments with diverse redox chemistry. We tested relative fungi, substrate (L-DOPA) floodplain representing range transient conditions driven permanent vs. periodic flooding. Phenol potential was highest permanently flooded fewer fungal taxa known observed (per)oxidase instead correlated HCl-extractable Fe(II), Fe(total) Fe(II)/Fe(total), suggesting specific role Fe(II). additions enhanced phenol sterilized non-sterilized presence peroxide, indicating Fe-mediated chemistry could significantly enhance wetland throughout redox-active soils. Fungal community composition did correlate overall only more oxic adjacent river communities showed declining after sterilization. addition across all soils, although it appeared drive fungal-mediated most aerated Understanding how mediate oxidants microbially-harnessed enzyme cofactors substrates under variable hydrologic controls will improve our ability represent models other frequently saturated

Language: Английский

Citations

19
Organic Carbon and Lignin Protection by Metal Oxides Versus Silicate Clay: Comparative Study Based on Wetland and Upland Soils DOI
Erxiong Zhu, Zongguang Liu, Simin Wang

et al.

Journal of Geophysical Research Biogeosciences, Journal Year: 2023, Volume and Issue: 128(7)

Published: July 1, 2023

Abstract Mineral binding of organic carbon (OC) is one the key mechanisms promoting soil (SOC) persistence, which vital for long‐term sequestration atmospheric dioxide into soils. However, relative importance two main types minerals ‐ metal oxides and silicate clay—in SOC protection remains unclear, hampering our ability to predict protect this important pool persistent SOC. Here, we analyzed OC bound (OC ) versus clay in soils from contrasting environments (i.e., wetlands uplands) using sequential dissolution by dithionite hydrofluoric acid. We found that % was higher than both uplands, indicating dominance protection. The sum constituted a fraction suggesting an underappreciated role mineral (in particular, oxide) wetland preservation. Furthermore, lignin phenol analysis tandem, ∼23% phenols were additionally released after removal clay, providing potential means assess “hidden” matrices. Given wide use as tracers terrestrial plant‐derived OC, results suggest contribution or sedimentary stocks mineral‐protected deserves reassessment. These findings highlight differential various its components environments, warrants better recognition understanding distribution dynamics

Language: Английский

Citations

18
Promotion of Humic Acid Transformation by Abiotic and Biotic Fe Redox Cycling in Nontronite DOI
Dafu Hu, Qiang Zeng,

Jin Zhu

et al.

Environmental Science & Technology, Journal Year: 2023, Volume and Issue: 57(48), P. 19760 - 19771

Published: Nov. 16, 2023

The redox activity of Fe-bearing minerals is coupled with the transformation organic matter (OM) in dynamic environments, but underlying mechanism remains unclear. In this work, a Fe cycling experiment nontronite (NAu-2), an Fe-rich smectite, was performed via combined abiotic and biotic methods, accompanying humic acid (HA) as representative OM investigated. Chemical reduction subsequent reoxidation NAu-2 produced abundant hydroxyl radicals (thereafter termed ·OH) that effectively transformed chemical molecular composition HA. More importantly, HA served more premium electron donor/carbon source to couple biological Fe(III) reoxidized by Geobacter sulfurreducens, model Fe-reducing bacterium. Destruction aromatic structures formation carboxylates were mechanisms responsible for transforming into energetically bioavailable substrate. Relative unaltered HA, increased extent bioreduction 105%, oxidation even mineralization resulting bleached microbial products cell debris. ·OH slightly decreased shuttling capacity bioreduction. Our results provide mechanistic explanation rapid driven redox-fluctuating environments.

Language: Английский

Citations

17
Facet-Dependent Productions of Reactive Oxygen Species from Pyrite Oxidation DOI
Mengxi Tan, Xiaoshan Zheng,

Wanchao Yu

et al.

Environmental Science & Technology, Journal Year: 2023, Volume and Issue: 58(1), P. 432 - 439

Published: Dec. 18, 2023

Reactive oxygen species (ROS) are widespread in nature and play central roles numerous biogeochemical processes pollutant dynamics. Recent studies have revealed ROS productions triggered by electron transfer from naturally abundant reduced iron minerals to oxygen. Here, we report that pyrite oxidation exhibit a high facet dependence. Pyrites with various compositions displayed distinct efficiencies producing superoxide (O2• –), hydrogen peroxide (H2O2), hydroxyl radical (•OH). The 48 h •OH production rates varied 3.1-fold 11.7 ± 0.4 36.2 0.6 nM h–1, showing strong correlation the ratio of {210} facet. Such dependence primarily stems different surface electron-donating capacities (2.2–8.6 mmol e– g–1) kinetics (from 1.2 × 10–4 5.8 s–1) faceted pyrites. Further, Fenton-like activity also 10.1-fold variations among pyrites, contributing depedence productions. can greatly affect ROS-driven transformations. As paradigm, degradation carbamazepine, phenol, bisphenol A 3.5–5.3-fold pyrites compositions, where were good agreement ratio. These findings highlight crucial role composition determining subsequent reactions during mineral oxidation.

Language: Английский

Citations

17
Biochar application can enhance phosphorus solubilization by strengthening redox properties of humic reducing microorganisms during composting DOI Creative Commons
Bowen Fan, Changjiang Zhao, Liqin Zhao

et al.

Bioresource Technology, Journal Year: 2024, Volume and Issue: 395, P. 130329 - 130329

Published: Jan. 15, 2024

Phosphorus (P) in nature mostly exists an insoluble state, and humic reducing microorganisms (HRMs) can dissolve substances through redox properties. This study aimed to investigate the correlations between P dominant HRMs amenable individual culture during biochar composting. These analyses revealed that, comparison control, addition increased relative abundance of by 20.3% decreased potential (Eh) levels 15.4% hence, enhancing moderately-labile-P non-labile-P dissolution. The pathways underlying observed effects were additionally assessed structural equation modeling, revealing that promoted dissolution both direct bacterial community structure as well indirect based on Eh structure. research offers a better understanding effect composting process.

Language: Английский

Citations

7