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PubMed Journals Articles About "Competitive Binding Goethite Organo Mineral Composites Made With" RSS

21:09 EST 12th December 2018 | BioPortfolio

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Showing "Competitive binding goethite organo mineral composites made with" PubMed Articles 1–25 of 11,000+

Competitive binding of Cd, Ni and Cu on goethite organo-mineral composites made with soil bacteria.

Soil is a heterogeneous porous media that is comprised of a variety of organo-mineral aggregates. Sorption of heavy metals onto these composite solids is a key process that controls heavy metal mobility and fate in the natural environment. Pollution from a combination of heavy metals is common in soil, therefore, understanding the competitive binding behavior of metal ions to organo-mineral composites is important in order to predict metal mobility and fate. In this study, batch experiments were paired with...


Using chromate to investigate the impact of mineral-organic contact time on the surface reactivity of goethite.

Chromate was used as a chemical probe to investigate the impact of mineral-organic contact time on the surface reactivity of two different sizes of goethite particles. A series of goethite-chromate sorption batch reactions were conducted in the presence and absence of Suwannee River humic acid (HA) and natural organic matter (NOM) using nano- and micro-scale goethite particles. In experiments with added organics the amount of time allowed for goethite-organic matter interaction (i.e. contact time) was varie...

Soil mineral alters the effect of Cd on the alkaline phosphatase activity.

The toxicity of heavy metals (HMs) to soil enzymes is directly influenced by the status of the enzyme (free vs. immobilized on minerals) and the duration of exposure. However, little information is available on the interaction effect of HMs, mineral, and exposure time on soil enzyme activities. We investigated the interaction mechanism of alkaline phosphatase (ALP) with minerals (montmorillonite and goethite) and the response of free and immobilized ALP to cadmium (Cd) toxicity under different exposure time...


Interactions between Goethite and Humic Acid and the Stability of Goethite-Humic Acid Complex.

Goethite-humic acid complex was prepared in a suspension containing goethite and humic acid. X-ray diffraction (XRD) results showed that the crystal structure of this complex had no obvious changes compared to pure goethite, but the peak intensity of the complex was slightly reduced. Transmission electron microscopy (TEM) images indicated that the surface of the goethite was coated by particles of humic acid. Compared to the infra-red (IR) spectra of goethite and humic acid, the anti-vibrational frequencies...

Protection of extractable lipid and lignin: Differences in undisturbed and cultivated soils detected by molecular markers.

Understanding formation of organo-mineral association is crucial for soil organic matter (SOM) stabilization. To remove reactive minerals from un-disturbed natural soil (NS) and two cultivated soils (dry-farming soil, TD, and terrace paddy soil, TP), a 10% HF/1M HCl treatment was applied. The mineral protection of different molecular SOM structures before and after cultivation was compared by using markers for lipid and lignin. The removal of reactive mineral increased the lipid extractability in TD and NS ...

Examining mineral-associated soil organic matter pools through depth in harvested forest soil profiles.

Mineral-associated organic matter is associated with a suite of soil minerals that can confer stability, resulting in the potential for long-term storage of carbon (C). Not all interactions impart the same level of protection, however; evidence is suggesting that C in certain mineral pools is dynamic and vulnerable to disturbance in the decades following harvesting. The objective of this research was to describe and characterize organic matter-mineral interactions through depth in horizons of soils of contr...

Bonding of monocarboxylic acids, monophenols and nonpolar compounds onto goethite.

Adsorption of a diverse set of chemicals onto goethite was evaluated by column chromatography. The pH of the effluents was 4.7-5.2. Van der Waals forces dominate the exothermic adsorption of 8 nonpolar compounds (e.g., PAHs and chlorobenzenes). H-bonding is responsible for the adsorption of 32 monocarboxylic acids (i.e., benzoic acids, naphthoic acids and acidic pharmaceuticals) and their adsorption tends to be endothermic. Steric effects significantly decreased the bonding of monocarboxylic acids with orth...

Binding of Nucleic Acid Components to the Serpentinite-Hosted Hydrothermal Mineral Brucite.

The adsorption of nucleic acid components onto the serpentinite-hosted hydrothermal mineral brucite has been investigated experimentally by determining the equilibrium adsorption isotherms in aqueous solution. Thermodynamic characterization of the adsorption data has been performed using the extended triple-layer model (ETLM) to establish a model for the stoichiometry and equilibrium constants of surface complexes. Infrared characterization of the molecule-mineral complexes has helped gain insight into the ...

Synthesis and DNA binding profile of monomeric, dimeric, and trimeric derivatives of crystal violet.

Monomeric, dimeric, and trimeric derivatives of the triphenylmethane dye crystal violet (1a-1f) have been synthesized for the purpose of evaluating their affinity and sequence selectivity for duplex DNA. Competitive ethidum displacement assays indicate that 1a-1f have apparent association constants for CT DNA in the range of 1.80-16.2 × 10 M and binding site sizes of 10-14 bp. Viscosity experiments performed on ligand 1f confirmed that these dyes associate with duplex DNA by a non-intercalative mod...

A novel electron-microscopic method for measurement of mineral content in enamel lesions.

To assess Scanning Electron Microscopy in Back-Scattered Emission mode (BSE-SEM) for measurement of lesion mineral content as a function of depth. Direct comparison is made with Transverse Micro-Radiography (TMR) and Surface Micro-Hardness (SMH) on carious and erosive lesions.

Coupled Kinetics of Ferrihydrite Transformation and As(V) Sequestration under the Effect of Humic Acids: A Mechanistic and Quantitative Study.

In natural environments, kinetics of As(V) sequestration/release is usually coupled with dynamic Fe mineral transformation, which is further influenced by the presence of natural organic matter (NOM). Previous work mainly focused on the interactions between As(V) and Fe minerals. However, there is a lack of both mechanistic and quantitative understanding on the coupled kinetic processes in the As(V)-Fe mineral-NOM system. In this study, we investigated the effect of humic acids (HA) on the coupled kinetics ...

Catalytic ozonation of 4-chloronitrobenzene by goethite and Fe-modified goethite with low defects: A comparative study.

In this study, Fe-modified goethite with low defects (α-Fe(Fe)OOH) was synthesized and characterized. Results revealed that α-Fe(Fe)OOH is a nano magnetic material with goethite (α-FeOOH) -type structures and has fewer Lewis acid of Fe on its surface. Moreover, α-Fe(Fe)OOH was effective in catalytic ozonation of 4-chloronitrobenzene (4-CNB), which is a probe contaminant that cannot be efficiently removed through sole ozonation. The removal of 4-CNB increased with ozone concentration and α-Fe(Fe)OOH dos...

Arsenite and chromate sequestration onto ferrihydrite, siderite and goethite nanostructured minerals: Isotherms from flow-through reactor experiments and XAS measurements.

Sorption isotherms remain a major tool to describe and predict the mobility of pollutants in natural and anthropogenic environments, but they are typically determined by independent batch experiments. In the present study, the sequestration of As(III), Cr(VI) and competitive As(III)-Cr(VI) on/in 6L-ferrihydrite, siderite and goethite nanostructured minerals was reinvestigated using stirred flow-through reactor experiments. Herein, sorption isotherms were particularly determined from breakthrough curves for ...

An Experimental Protocol for Studying Mineral Effects on Organic Hydrothermal Transformations.

Organic-mineral interactions are widely occurring in hydrothermal environments, such as hot springs, geysers on land, and the hydrothermal vents in the deep ocean. Roles of minerals are critical in many hydrothermal organic geochemical processes. Traditional hydrothermal methodology, which includes using reactors made of gold, titanium, platinum, or stainless-steel, is usually associated with the high cost or undesired metal catalytic effects. Recently, there is a growing tendency for using the cost-effecti...

The Microstructure, Proteomics and Crystallization of the Limpet Teeth.

Limpets are marine mollusks using mineralized teeth, one of the hardest and strongest biomaterials, to feed on algae on intertidal rocks. However, most of studies only focuses on the ultrastructure and chemical composition of the teeth while the molecular information is largely unknown, limiting our understanding of this unique and fundamental biomineralization process. In this study, we investigated the microstructure, proteomics and crystallization in the teeth of limpet Cellana toreuma. It is found that ...

Iron speciation at the riverbank surface in wetland and potential impact on the mobility of trace metals.

Fe oxyhydroxides in riverbanks and their high binding capacity can be used to hypothesize that riverbanks may act as a "biogeochemical filter" between wetlands and rivers and may constitute a major mechanism in the trapping and flux regulation of chemical elements. Until now, the properties of Fe minerals have been very poorly described in riverbanks. The goals of the present work are to identify Fe speciation in riverbanks where ferric deposits are observed and to determine their impact on the metal behavi...

Arsenic mobilization from iron oxides in the presence of oxalic acid under hydrodynamic conditions.

Oxalic acid potentially enhances pump-and-treat for groundwater As remediation by accelerating mobilization. This study examines how oxalic acid mobilizes As from Fe(III)-oxide coated sand under hydrodynamic conditions. Four columns were packed with metal-substituted ferrihydrite or goethite to 1% Fe, presorbed to 50% As surface coverage, and reacted with pH = 2.2 artificial groundwater amended with 10 mM oxalic acid at 1 m day. Arsenic elution was affected by both As and Fe speciation. Although the...

Designing for Cross-coupling Reactions Using Aryl(trialkyl)silanes.

Organo(trialkyl)silanes have advantages in view of stability, low toxicity, solubility, handling, and ready availability compared with heteroatom-substituted silanes. On the other hand, cross-coupling with organo(trialkyl)silanes has been limited probably because of the exceeding robustness. Thus, a practical cross-coupling method with organo(trialkyl)silanes has been a long-standing challenging research target. This article discusses the designing how to use aryl(trialkyl)silanes for the cross-coupling. A ...

Deltahedral Organo-Zintl Superhalogens.

Zintl ions are of a special type of naked anionic cluster mainly consists of group 13, 14 and 15 elements in the periodic table. Due to the presence of multiple negative ions, the chemistry of Zintl ions are unique. Not only they are forming Zintl phase with alkali and alkaline earth metals but also forming different organo-Zintl cluster with different properties. Using first principle calculation based on density functional theory we have designed a new deltahedral Organo-Zintl cluster with Ge94- as core a...

Division of roles of modified chains in organo-magnetic nanoparticles using Organo-modified agents having hydrophilic reactive polar groups at both ends: Formation of high-density single-particle layers and bioconjugation.

The behavior of an organo-modified chain that changes its role depending on the environment has been investigated. Long-chain carboxylic acids having a hydrophilic reactive polar group at both ends were allowed to act on magnetic nanoparticles to produce organo-modified particles. These amphiphilic organo-magnetic nanoparticles are synthesized by the reaction of a hydroxyl terminal group on the outermost surface of the magnetic particle and a carboxylic acid. With spreading at the air/water interface, an ex...

Probing the interaction of 2,4-dichlorophenoxyacetic acid with human serum albumin as studied by experimental and computational approaches.

To characterize the binding of a widely used herbicide, 2,4-dichlorophenoxyacetic acid (2,4-D) to the major transporter in human circulation, human serum albumin (HSA), multi-spectroscopic approaches such as fluorescence, absorption and circular dichroism along with computational methods were employed. Analysis of the fluorescence and absorption spectroscopic data confirmed the 2,4-D-HSA complex formation. A static quenching mechanism was evident from the inverse temperature dependence of the K values. The ...

A benchmark driven guide to binding site comparison: An exhaustive evaluation using tailor-made data sets (ProSPECCTs).

The automated comparison of protein-ligand binding sites provides useful insights into yet unexplored site similarities. Various stages of computational and chemical biology research can benefit from this knowledge. The search for putative off-targets and the establishment of polypharmacological effects by comparing binding sites led to promising results for numerous projects. Although many cavity comparison methods are available, a comprehensive analysis to guide the choice of a tool for a specific applica...

Heteroaggregation of an enveloped bacteriophage with colloidal sediments and effect on virus viability.

Four sediments in the colloidal size range: goethite, montmorillonite, illite, and kaolinite, were suspended with the bacteriophage φ6, a model enveloped virus, to determine relative rates of heteroaggregation and the effect of aggregation on virus viability. Turbidity was measured on combinations of virus and each sediment type at low concentration to determine aggregation rates. Aggregation of sediment with virus occurred regardless of mineral type, and larger fraction of virus is expected to aggregate w...

Micro-computed tomography assessment of root dentin around fluoride-releasing restorations after demineralization/remineralization.

Using micro-computed tomography (micro-CT), this study assessed the inhibitory effect of three different types of restorations on root-caries formation under a cariogenic challenge. Bovine-root dentin blocks with a cylindrical cavity were divided into three restoration groups: a fluoride-free self-etch adhesive and a resin composite (SE-ES); a self-etch adhesive and a resin composite with multi-ion release (FL-BF); and a glass ionomer cement (Fuji-VII). After the restorative procedures, the specimens were s...

Abiotic hydroxylamine nitrification involving manganese- and iron-bearing minerals.

Hydroxylamine (NHOH) undergoes biotic and abiotic transformation processes in soil, producing nitrous oxide gas (NO(g)). Little is known about the magnitude of the abiotic chemical processes in the global N cycle, and the role of abiotic nitrification is still neglected in most current nitrogen trace gas studies. The abiotic fate of NHOH in soil systems is often focused on transition metals including manganese (Mn) and iron (Fe), and empirical correlations of nitrogen residual species including nitrite (NO)...


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