Uptake arsenates. Medical search. Frequent questions

Effect of external iron and arsenic species on chelant-enhanced iron bioavailability and arsenic uptake in rice (Oryza sativa L. (com.pk)
Researchers from Korea evaluate and compare the efficacies of calcite and phosphogypsum in reducing arsenic uptake in crops grown in upland soils that often contain arsenic ions as a pollutant. (environmentnewswire.com)

This manuscript reports the toxic effects of As2O3 (arsenic trioxide) and As2O5 (arsenic pentoxide) on S. kali as well as the arsenic and phosphate uptake and arsenic coordination within plant tissues. (unboundmedicine.com)
Arsenate is a phosphate analogue and is taken up by the phosphate uptake system. (qub.ac.uk)
Both forms are toxic: arsenite disrupts sulfhydryl groups of proteins and interferes with enzyme function, whereas arsenate acts as a phosphate analog and can interfere with phosphate uptake and transport. (easyreport.in)
Microorganisms have evolved a variety of mechanisms for coping with arsenic toxicity, including minimizing the amount of arsenic that enters the cell (e.g., through increased specificity of phosphate uptake), oxidizing the arsenite (through the activity of arsenite oxidase), or arsenite peroxidation with membrane lipids. (easyreport.in)

Arsenate was less toxic, and more As translocation occurred from the roots to the leaves. (unboundmedicine.com)
De Oliveira LM, Gress J, De J, Rathinasabapathi B , Marchi G, Chen Y, Ma, LQ (2016) Sulfate and chromate increased each other's uptake and translocation in As-hyperaccumulator Pteris vittata . (expertnet.org)
The aim of this thesis was to investigate the occurrence of inorganic and methylated thioarsenates in paddy fields and to study their transformation, uptake, accumulation, and translocation by rice plants. (uni-bayreuth.de)
Higher translocation from roots to shoots, compared to the non-thiolated analog arsenate implied that different, so far unknown, enzymes and transporters were involved in the uptake, reduction, and translocation of MTA. (uni-bayreuth.de)
The overall As uptake and translocation of rice plants exposed to MMMTA was similar to MMAV, indicating effective As sequestration in roots, even though the exact mechanism for MMMTA sequestration remained unknown. (uni-bayreuth.de)
Altogether, the four studies demonstrated the importance of thioarsenates in paddy soils and for the uptake, translocation, and accumulation in rice plants. (uni-bayreuth.de)

Arsenic is found in mainly in two forms: arsenite and arsenate. (easyreport.in)
Commonly, only inorganic arsenite and arsenate, as well as organic monomethylarsenate (MMAV) and dimethylarsenate (DMAV) are considered to be important As species in paddy soils, even though sulfate-reducing, methanogenic conditions are reported in paddy soil pore-water. (uni-bayreuth.de)

Adsorption of arsenate was high at low ionic strength and was decreased with increasing the ionic strength. (ac.ir)
Competitive adsorption of arsenate and arsenite on oxides and clay minerals. (ac.ir)
Adsorption of cationic elements increases with increasing pH, whereas adsorption of arsenate [As(V)] shows the opposite trend. (elsevierpure.com)

Overall, the experimental data and model parameters implied that the stronger interaction of phosphate with calcite increases bioavailability and mobility of arsenate in calcareous soils. (ac.ir)
In a new study, researchers from Korea evaluated and compared the effectiveness of these two materials in mitigating As availability for crops in soils spiked with arsenate, a pentavalent form of As. (environmentnewswire.com)
In its pentavalent form, known as arsenate [As(V)], As is easily absorbed by crops grown in these soils and, through them, enter the human body. (environmentnewswire.com)
However, additional studies are required because only a few studies have focused on the effects of application of Mn/Fe oxides on As mobility in anaerobic soils and consequent uptake by rice plants. (elsevierpure.com)

Iron plaque, an Fe oxide precipitate that forms on rice roots, may attenuate As concentrations in rice tissues by fixing and sequestering As, although some studies have questioned this possibility.There have been many attempts to use Mn/Fe oxides (or materials containing them) to attenuate the soil solubility of trace elements and/or reduce their uptake by crops. (elsevierpure.com)

Although there may be some differences in the potency of different chemical forms (e.g., arsenites tend to be somewhat more toxic than arsenates), these differences are usually minor. (cdc.gov)
Removal of toxic arsenate from drinking water is a global problem affecting more than one hundred million people worldwide. (rug.nl)

Previously, our in silico analyses identified four candidate genes that might be involved in uptake and/or accumulation of arsenics in plants: arsenate reductase 2 ( ACR2 ), phytochelatin synthase 1 ( PCS1 ) and two multi-drug resistant proteins ( MRP1 and MRP2 ) [Lund et al. (diva-portal.org)

Because of the importance of this reaction in controlling the equilibrium concentrations of arsenate and phosphate in soil, in this research, arsenate adsorption on calcite was measured and modeled as a function of arsenate concentration and ionic strength and also in competition with phosphate. (ac.ir)
Arsenate adsorption was also decreased with increasing phosphate concentration, but arsenate had no effect on phosphate adsorption indicating phosphate is adsorbed stronger than arsenate on calcite. (ac.ir)
Arsenate uptake by calcite: macroscopic and spectroscopic characterization of adsorption and incorporation mechanisms. (ac.ir)

Adsorption isotherms showed that arsenate adsorption is affected by the ionic strength and the initial concentration of arsenate. (ac.ir)
Effects of pH and ionic strength on the adsorption of phosphate and arsenate at the goethite-water interface. (ac.ir)
Xu T., Catalano J.G. (2018) Effects of ionic strength on arsenate adsorption at aluminum hydroxide-water interface. (wustl.edu)

Resistance to arsenic species in both Gram-positive and Gram-negative organisms results from energy-dependent efflux of either arsenate or arsenite from the cell, mediated by the ars operon [4-6]. (easyreport.in)

Some sources do note, however, that trivalent arsenic (arsenite) can pass through the skin much more easily than pentavalent arsenic (arsenate). (purewatergazette.net)

Biomass and phosphorus allocation were determined in arsenate tolerant and non-tolerant clones of the grass Holcus lanatus L. in both solution culture and in soil. (qub.ac.uk)
Arsenate and phosphate are two important oxyanions in natural systems like soil and because of similar ionic properties strongly compete for the colloids surface charge via adsorption and desorption reactions. (ac.ir)
Much effort has, therefore, gone into mitigating the uptake of heavy metal pollutants by crops grown in contaminated soil. (environmentnewswire.com)

To simulate POU application, the optimized composite was tested in a dead-end, flow-through filtration system for arsenate and chromate removal at environmentally relevant concentrations (e.g., μg/L) in both idealized and simulated tap water matrices. (uiowa.edu)
Arsenate as Na-HAsO4 was added to the culture media at concentrations from 10 - 8 to 10 - 4M. (ihb.ac.cn)

Dermal uptake of arsenic has been underestimated up to now based on low permeability of arsenate. (purewatergazette.net)
The literature, while of limited quality, overall strongly suggests inorganic Pb has the potential for dermal uptake in meaningful amounts associated with negative health outcomes based on upper bound diffusion rate estimates. (cdc.gov)
Future standard test guideline-compliant studies are needed to provide high confidence estimates of dermal uptake. (cdc.gov)

Via a single-pot electrospinning synthesis, we developed a functionalized polymer-metal oxide nanofiber filter for point of use (POU) water treatment of metal oxyanions (e.g., arsenate and chromate). (uiowa.edu)

When clones differing in their arsenate tolerance were grown in solution culture with a range of phosphate levels, a tolerant clone did not fare as well as a non-tolerant at low levels of phosphate nutrition in that it had reduced shoot biomass production, increased biomass allocation to the roots and lower shoot phosphorus concentration. (qub.ac.uk)

These analyses revealed that, for catalytic metabolism of arsenate, the arsenate binding-loop (AB-loop) and residues Phe-53, Phe-54, Cys-134, Cys-136, Cys-141, Cys-145, and Lys-135 are essential for reducing arsenate to arsenic intermediates (arsenylated enzyme-substrate intermediates) and arsenite in plants. (diva-portal.org)

Tolerance to arsenate in this grass is achieved by suppression of arsenate (and phosphate) influx. (qub.ac.uk)
The gene for arsenate tolerance is polymorphic in arsenate uncontaminated populations. (qub.ac.uk)
Because a decrease in shoot growth combined with an increase in root growth leads to survival under drought stress and nutrient limiting conditions, it was not surprising to find that auxin promotes, while cytokinin reduces, drought stress tolerance and nutrient uptake. (bvsalud.org)

The ecological implications of these results are that it appears that suppression of the high affinity uptake system, is at least in part, compensated by increased mycorrhizal infection. (qub.ac.uk)
fMT]] is a metallothionein, binding Arsenite(III) and Arsenate(V), it has higher affinity for As(III). (igem.org)

However, animal studies have shown that other organic arsenic compounds (methyl and phenyl arsenates, for example) can produce health effects similar to those produced by inorganic arsenic [ATSDR 2007]. (cdc.gov)

Composite performance was then evaluated using kinetic, isotherm, and pH-edge sorption experiments with arsenate and chromate, and benchmarked to unmodified PAN nanofibers and freely dispersed Fh nanoparticles. (uiowa.edu)
The optimized composite (PAN 7 wt%, Fh 3 wt%, TBAB 1 wt%) exhibited two distinct sites for simultaneous, non-competitive metal binding (i.e., iron oxide sites for arsenate removal via sorption and well-retained QAS sites for chromate removal via ion exchange). (uiowa.edu)
Although chromate removal via ion exchange is more susceptible to interfering counter-ions, arsenate removal in simulated tap water indicates that ∼130 g of the composite could produce an individual's annual supply of drinking water (assuming an influent contaminated with 100 μg As/L, which is 10 times the current MCL). (uiowa.edu)

Additionally, the mobility of methylated thioarsenates in presence of Fe(oxyhydr)oxide was examined and it was tested whether roots covered with Fe(oxyhydr)oxide could be a barrier for the uptake of methylated thioarsenates in rice plants. (uni-bayreuth.de)

Wood preservative chromated copper arsenate, arsenic pesticides, glass production, pharmaceuticals, non-ferrous alloys and wastes of leather industries. (easyreport.in)
The potential of radio frequency heating to accelerate the fixation of chromated copper arsenate (CCA) in treated round-wood was assessed. (irg-wp.com)
Following pressure treatment with chromated copper arsenate (CCA type C) and ammoniacal copper arsenate (ACA) the preservative penetration and retention in individual veneers was assessed. (irg-wp.com)
Treatment of Douglas-fir with chromated-copper-arsenate (CCA) poses a major challenge. (irg-wp.com)

Compared with previous reports, SPC@La-oxalate adsorbent could be easily prepared, and the uptake amounts for AsO 4 3- were enriched. (elsevierpure.com)

Performance trends indicate that dual mechanisms for uptake are maintained in kinetically limited regimes. (uiowa.edu)
We measured the density of cultures,chlorophyll content and microcystin content of this cyanobacterium re-ponding to arsenate under both the phosphate regimes. (ihb.ac.cn)

Arsenate in water causes high rate of diseases even in low dosage. (rug.nl)
Otherwise,arsenate did not affect the chlorophyll content per cell,but had dosage effect on the cellularmi-rocystin content. (ihb.ac.cn)

They suggested that this was due to a mechanism induced by phosphogypsum in which sulfate (SO 4 2- ) ions were exchanged with hydrogen arsenate (HAsO 4 2- ) ions that, in turn, led to a reduced As(V) availability. (environmentnewswire.com)

Adsorption experiments, and model results show that amine modified polyketone has high arsenate uptake capacity up to 190 mg/g polyketone resin. (rug.nl)

Arsenate,thermodynamically theominant specie of arsenic in marine and estuarine surface waters,was shown to be taken up by the phosphate transportystems of phytop lankton and plants due to its similar structure to the phosphate. (ihb.ac.cn)

Goethite-rich iron plaque formed around rice roots, was no barrier for the uptake of MMMTA and DMMTA in rice roots, as they were not sorbed effectively. (uni-bayreuth.de)

A new study finds that uptake of arsenic as arsenite or dimethylarsinic acid is a factor of 29 and 59 higher than that of arsenate. (purewatergazette.net)

It should be known how high the arsenate uptake capacity to make comparison with other adsorbants and technologies possible. (rug.nl)
This high uptake capacity by itself makes amine modified an excellent adsorbant. (rug.nl)

Arsenate should be removed from drinking water to a very low concentration below 10 μg/L according advice from the World Health Organization. (rug.nl)

Thus, functional predictions suggest that the ACR2 protein is involved in the conversion of arsenate to arsenite in plant cells. (diva-portal.org)

The synergistic effect of arsenate and microcystin production ofM. (ihb.ac.cn)

Thepparent association constant of arsenate to the cyanobacterium under phosphate limitation wasmuch lower than that underhosphate deprivation. (ihb.ac.cn)

To show functionality as an adsorbant for arsenates, amine modified polyketone was measured in a continuous flow adsorption column. (rug.nl)

At the above pH range, arsenic(V) uptake is exothermic. (csic.es)

Arsenate,higher than 10-7mol/L,could promote the cellularmicrocystin content per cell under phos-hate limitation,while the microcystin content of all arsenate treatments was stimulated about 78% of that of the controlnder phosphate deprivation. (ihb.ac.cn)

In vitro studies have shown that the cellular uptake of As (III) is greater than that of As (V) [Bertolero et al. (cdc.gov)

Organisms6

Diseases1

Chemicals and Drugs16

Phenomena and Processes5

Arsenic uptake2

Phosphate uptake4

Translocation6

Arsenite and arsenate2

Adsorption of arsenate3

Soils4

Oxides1

Toxic2

Reductase1

Calcite3

Ionic strength3

Efflux1

Pentavalent1

Soil3

Concentrations2

Dermal3

Oxyanions1

Phosphorus1

Metabolism1

Tolerance3

Affinity2

Inorganic arsenic1

Chromate3

Rice plants1

Copper4

Amounts1

Regimes2

Dosage2

Sulfate1

Resin1

Plants1

Roots1

Study1

High2

Water1

Plant1

Production1

Association1

Show1

Range1

Cell1

Studies1