redox conditions controlled

Methylation and demethylation of mercury under controlled redox…

At -220 mV, high salinity (2.5%) inhibited methylation, and low salinity (0.4%) favored it. At +110 mV, the salinity effect was less pronounced. Demethylation of CH3HgCl was favored at +110 mV regardless of the salinity level. Low redox potential under low salinity conditions inhibited demethylation, but high salinity reversed this inhibition.

Iron (hydr)oxide formation in Andosols under extreme climate conditions …

During successive redox cycles that are controlled by frequent hydrological perturbations under hyper-humid climate, (trans)formations of ferrihydrite-organic matter coprecipitates, maghemite and ...

Cyclic electron flow is redox-controlled but independent of …

Photosynthesis is the biological process that feeds the biosphere with reduced carbon. The assimilation of CO2 requires the fine tuning of two co-existing functional modes: linear electron flow, which provides NADPH and ATP, and cyclic electron flow, which only sustains ATP synthesis. Although the importance of this fine tuning is appreciated ...

Pig carcass-derived biochar caused contradictory effects on …

The impact of animal-derived biochar on As mobilization under fluctuating redox conditions in paddy soils has not been studied. Consequently, we investigated the effects of pig carcass-derived biochar (PB) on As (im)mobilization in a contaminated paddy soil under controlled redox potential (Eh) using a biogeochemical microcosm-setup.

Recent progress and advances in redox …

The above results suggested that drug release from cross-linked micelles can be controlled well using both pH and redox conditions. These dual-responsive polymeric drug delivery systems with precise drug release …

Mercury transformations in resuspended contaminated sediment controlled

It might also be that redox conditions are preventing further Hg loss through supplying sulfide to (re)sequester Hg (as HgS or within pyrite) or that sulfate-and iron-reducing microbiota ...

Trace element remobilization following the resuspension …

Request PDF | Trace element remobilization following the resuspension of sediments under controlled redox conditions: City Park Lake, Baton Rouge, LA | The sediments of City Park Lake (Baton Rouge ...

Fate of sulfamethoxazole in wetland sediment under controlled redox …

V.R. Collard. The effect of controlled pH and redox potential conditions on the persistence of three insecticide compounds (DDT, kepone, and permethrin) in soil and sediment-water suspensions was ...

Thermotaxis in Chlamydomonas is brought about by …

Sekiguchi, M., Kameda, S., Kurosawa, S. et al. Thermotaxis in Chlamydomonas is brought about by membrane excitation and controlled by redox conditions. Sci Rep 8, 16114 (2018 ...

Cyclic electron flow is redox-controlled but …

Cyclic electron flow is redox-controlled but independent of state transition Hiroko Takahashi1,*, Sophie Clowez1,*, ... irrespective of the ambient redox conditions, we show that CEF

Redox Condition

Redox Condition. Such low-redox conditions are predominantly found in soils where prolonged waterlogging is a normal feature, e.g., natural wetlands and flooded rice fields, and beneath the soil cover of closed landfills, as well as in the sediments at the bottoms of lakes. ... (III) after 30-day equilibration period under controlled redox and ...

Oxidation–reduction (redox) reactions (article) | Khan Academy

An oxidation–reduction or redox reaction is a reaction that involves the transfer of electrons between chemical species (the atoms, ions, or molecules involved in the reaction). Redox reactions are all around us: the burning of fuels, the corrosion of metals, and even the processes of photosynthesis and cellular respiration involve oxidation and reduction.

Trace element remobilization following the resuspension …

The microcosm system, first used by Patrick et al. (1973) in controlled redox potential stirred suspension studies, consisted of a 2-L flask with a conical rubber septum (6.5 cm in diameter at the large end and 5.5 cm in diameter at the small end), on which the salt bridges, Pt electrodes, air outlet, air inlet, and N 2 inlet were inserted ...

Redox transformation of soil minerals and arsenic in …

The importance of redox conditions for the mobility of As has been investigated in many previous studies that have proved the interrelationship between As and other redox sensitive environmental factors using laboratory experiments subjected to redox cycles [3,4,12,[25], [26], [27]]. ... Controlled variation of redox conditions in a …

Fluorescent nanoswitch based on redox-controlled

Among them, the disulfide bond (-S-S-) is formed by two sulfhydryl molecules under oxidizing conditions. On the contrary, reducing conditions [20], [21], [22] can effectively cleave them. Therefore, disulfide bonds can be used for the detection of redox substances [23] and controlled release of drugs [24].

Controlled variation of redox conditions in a floodplain soil: …

In the redox chemistry of S, metal immobilization can be induced under anoxic conditions due to the presence of hardly soluble sulphides, but the release of As may be attributed to dissolution of ...

Redox control of the partitioning of platinum and palladium …

Combined with previous data obtained at oxygen fugacity below the fayalite–magnetite–quartz buffer, this indicates redox-controlled partitioning behavior whereby at oxidizing conditions...

Redox Control Systems in the Nucleus: Mechanisms and …

Control of the nuclear thiol-disulfide redox states involves both the elimination of oxidants to prevent oxidation and the reduction of oxidized thiols to restore …

Different B-Mo isotopic fractionation processes controlled …

Different B-Mo isotopic fractionation processes controlled by redox conditions in the subduction zone. July 2023. Chemical Geology 636:121646. DOI: …

Redox-dependent fractionation of iron isotopes in …

Abstract. Redox conditions control the release of iron (Fe) into soil pore waters. A fluctuating groundwater table in soils results in significant changes in redox …

Methane and water soluble iron production under controlled soil pH …

The dissolution and precipitation of Fe reflected both soil pH and soil redox potential (Eh). The objective of our experiment was to determine both CH 4 production and Fe reduction as measured by Fe in solution in a flooded paddy soil over a wide range of closely controlled pH and Eh conditions.

Fate of sulfamethoxazole in wetland sediment under …

Abstract. Redox condition is an important controlling factor for contaminant removal in constructed wetlands; however, the redox-sensitivity of antibiotic removal in wetland …

Different BMo isotopic fractionation processes controlled by …

The Sumatran BAB samples have similar Mo isotopic compositions but much lighter B isotopes than the CABs, revealing different B Mo isotopic fractionation …

A Redox‐Controlled Substrate Engineering Strategy for …

However, none of known fucosyltransferases (FucTs) could install the α1,3-linked fucose to the oligo-LacNAc substrates in a site-specific manner. Here, we report a facile and general redox-controlled substrate engineering strategy for the site-specific α1,3-fucosylation of complex glycans containing multiple LacNAc units.

The redox "filter" beneath magmatic orogens and …

Magma redox conditions are largely controlled by the Fe 3+ /Fe 2+ ratio because Fe is generally the most abundant source of electron transfer in most magmas. Therefore, melt redox will be dictated by the bulk …

Redox condition changes caused by impacts: Insights from …

Lunar sample. Glass beads. Impact. Oxygen fugacity. Redox change. 1. Introduction. The Moon was likely formed in the aftermath of a giant impact and it has an alkali-depleted, Earth's mantle-like composition [1], [2]. Given the much smaller core of the Moon compared with the Earth, the lunar mantle is expected to have a redox state …

Impact of controlled redox conditions on nickel in a …

Purpose Serpentine soils exist in many regions around the world; they are naturally enriched with nickel (Ni). An adequate understanding of soil processes determining Ni solubility is a special need particularly since less research has been addressed to Ni behavior under dynamic and controlled redox conditions. Our aim was (1) to …

Deep-basin gas generation via organic–inorganic …

The redox-controlled experiments were conducted in a closed gold-tube pyrolysis system in this study. Scaillet et al. (1992) found CCO buffer controlled-fH 2 was so high that H 2 would loss through the Au capsule wall, therefore, the continuous oxidation of the CCO buffers occurred during the pyrolysis experiments (Scaillet et al., 1992).

Mercury transformations in resuspended contaminated sediment controlled

Mercury transformations in resuspended contaminated sediment controlled by redox conditions, chemical speciation and sources of organic matter. Author links open overlay panel Wei Zhu a, Yu Song b, ... It is currently unclear how transient redox conditions may alter the solubility and chemical speciation of Hg II and MeHg in …

The impact of oscillating redox conditions: Arsenic immobilisation …

Redox potential is controlled primarily by the Fe 2+ /Fe 3+ redox couple using a log k value of 13.6. In the model, pH is used as an input parameter and was fixed at the beginning of each half cycle. In the model, pH is used as an input parameter and was fixed at the beginning of each half cycle.