Treatment Of Mn Research Articles

Effect of Mn on Cd2+ uptake by protoplasts of the Cd/Mn hyperaccumulator Celosia argentea Linn. differs by treatment method

The effect mechanism of Mn on Cd uptake by Celosia argentea was investigated via a series of hydroponics experiments. The results showed that different manganese treatments had different effects on Cd uptake by C. argentea. Mn pretreatment increased Cd uptake by root protoplasts at Cd concentrations (4 and 6 μM). Protoplasts reached peak Cd uptake rate at 6 μM Cd and 25 °C, with 67.71 ± 0.13 μM h−1 mL−1 in the control, and 77.99 ± 0.49 μM h−1 mL−1 in the 50 μM Mn pretreatment group. However, simultaneous treatment with Cd and Mn reduced the Cd2+ uptake by root protoplasts. This discrepancy may be attributed to the fact that cadmium and manganese share some transporters in root cells. The transcriptome analysis in roots revealed that ten genes (including ABCC, ABCA, ABCG, ABCB, ABC1, BZIP19, and ZIP5) were significantly upregulated in response to Mn stress (p < 0.05). These genes regulate the expression of transporters belonging to the ABC, and ZIP families, which may be involved in Cd uptake by root cells of C. argentea. Mn pretreatment upregulates the expression of Mn/Cd transporters, enhancing Cd uptake by root protoplasts. For the simultaneous treatment of Cd and Mn, inhibition of Cd uptake was due to the competition of the same transporters. These findings provide helpful insights for understanding the mechanism of Mn and Cd uptake in hyperaccumulators and give implications to improve the phytoremediation of Cd-contaminated soil by C. argentea.

Use of Chinese Herbal Medicine to Inhibit Podocyte Damage as Therapeutic Strategy for Membranous Nephropathy

ABSTRACT Membranous nephropathy (MN), one of the most common glomerular diseases, is a noninflammatory autoimmune podocyte disease. In the body, podocytes play an important role in maintaining the stability of the glomerular filtration barrier, and the degree of podocyte damage is a major determinant of MN prognosis because of the limited ability of podocytes to repair and regenerate. Although several therapeutic modalities for inhibiting podocyte damage are currently available, most lead to adverse, nonspecific systemic effects; therefore, newer drugs are necessary to target podocyte damage in MN. Traditional Chinese medicine (TCM) plays an important role in the treatment of primary MN in China. This study reviews the role of podocytes and the mechanisms of podocyte injury in MN glomeruli and summarizes the current status of complement-mediated therapy, the clinical efficacy of TCM in the treatment of primary MN, and the potential mechanisms regulating podocyte injury to support the development of new therapeutic strategies.

Magnetic Core@Shell Fe3O4@Polypyrrole@Sodium Dodecyl Sulfate Composite for Enhanced Selective Removal of Dyestuffs and Heavy Metal Ions from Complex Wastewater.

Adsorption materials have demonstrated huge potential in treating sewage; however, it is a great challenge to fabricate an adsorbent effectively adsorbing multiple dyestuffs and heavy metal ions simultaneously. Here, a magnetic core@shell Fe3O4@polypyrrole@sodium dodecyl sulfate (Fe3O4@PPy@SDS) composite is prepared through the combination of a hydrothermal method, an in situ polymerization method, and modification, exhibiting enhanced selective removal of five dyestuffs (methylene blue (MB), malachite green (MG), rhodamine B (RhB), Congo red (CR), acid red 1 (AR1)), and heavy metal ions (Mn(VII)). The effects of adsorbent type, time, initial concentration of the adsorbate, and temperature on adsorption performances are investigated in detail. Kinetics and isotherm studies indicate that all adsorption processes are more in line with the pseudo-second-order kinetic model and the Langmuir model, the diffusion behavior is controlled by intraparticle diffusion and liquid film diffusion, and research of thermodynamics reveals a spontaneous endothermic behavior. The removal efficiency after five desorption-adsorption cycles can still reach more than 90%. The prepared Fe3O4@PPy@SDS composite is an efficient and promising renewable adsorbent for the treatment of dyestuffs and Mn(VII), exhibiting a wide range of applications in the field of adsorption.

#3418 DISAPPEARANCE OF GLOMERULAR C3 DEPOSITION MIGHT BE A PROGNOSTIC MARKER IN MEMBRANOUS NEPHROPATHY AFTER TREATMENT

Abstract Background and Aims Membranous nephropathy (MN) is the most common cause of nephrotic syndrome (NS) in adults. In about 80% is primary and remaining 20% are secondary due to medications or other diseases. Treatment of primary MN remains controversial, and the prognosis is still difficult to predict despite the introduction of anti phospholipase A2 receptor (PLA2R) antibody. We evaluated pathological changes for predicting prognosis in patients of MN after methyprednisolone (MPD) pulse therapy. Method We performed 1,649 renal biopsies at the OPD during last 9 years, of which 31 subjects were MN. We performed follow up biopsy who showed normal urinary findings after treatment with MPD pulse therapy in 11 subjects of MN. Indications of the initial biopsy in MN were oral steroid resistant NS (9 subjects), massive proteinuria associated with hematuria (2 subjects). Among the 11 subjects of MN, 3 subjects were lupus nephritis (LN), 8 subjects were primary MN. One cycle of MPD consist of 10-20 mg/kg (max 1.0 g)/day for 3 consecutive days, performing every 10 to 14 days. Mean MPD pulse therapy were done 13 cycles Results Among the 11 cases of MN, male to female ratio was 6 to 5. Age distribution from 1 year old to 61years old (mean 40.8 y/o), Mean spot urine protein to creatinine before treatment was 4,182.5 mg/g and 189.4 mg/g after treatment. 9 subjects showed glomerular C3 deposition were noted at the initial biopsy and 2 subjects showed no C3 deposition. After treatment glomerular C3 deposition were disappeared in 8 subjects, and showed no relapse during 5.3 years follow up. However, 3 subjects who showed glomerular C3 deposition were lupus nephritis, relapsed during follow up period. Conclusion MPD pulse therapy might be still promising therapeutic modality in conventional oral steroid resistant MN. Although further larger number of studies are mandatory, disappearance of glomerular C3 deposition might be a prognostic marker for treatment response, instead of disappearance of proteinuria in MN.

High-coverage targeted lipidomics could reveal lipid alterations and evaluate therapeutic efficacy of membranous nephropathy

BackgroundMembrane nephropathy (MN) often presents as nephrotic syndrome with characteristic lipid metabolism that could not be explained by lipid indicators commonly used in clinical practice. Studies have shown that invigorating spleen and qi, activating blood and detoxication in the treatment of MN is an effective method proved by randomized controlled clinical trial. However, the alterations of lipid profile before and after traditional Chinese medicine (TCM) treatment and the related lipid markers that affect the therapeutic effect have not been fully clarified.MethodsWe analyzed plasma lipid profiles of 92 patients with MN before and after TCM treatment by high-coverage targeted lipidomics.Results675 lipids were identified, of which 368 stably expressed lipids (coefficient of variation less than 30% and deletion value less than 10%) were eventually included for statistical analysis. 105 lipids were altered mainly including spingolipids, glycerides, glycerophosholipid, fatty acyl and steroids, among which, the abundance of ceramides (Cers), sphingomyelins (SMs), diacylglycerols (DGs), phosphatidylcholines (PCs) were lower than those before treatment with statistically significant difference. The WGCNA network to analyze the correlation between the collective effect and the therapeutic effect showed that the triglyceride (TG) molecules were most relevant to the therapeutic effect. Analysis of 162 triglyceride molecules showed that 11 TGs were significantly down-regulated in the effective group which were concentrated in carbon atom number of 52–56 and double bond number of 0–4. TGs molecules including TG56:2-FA20:0, TG56:2-FA20:1, TG56:3-FA20:0 and TG56:5-FA20:2 were most closely related to the therapeutic effect of TCM after adjusting the influence of clinical factors. ROC curve analysis showed that these four lipids could further improve the predictive efficacy of treatment based on clinical indicators.ConclusionOur work demonstrated that the therapeutic effect of invigorating spleen and qi, activating blood and detoxication in the treatment of MN may be exerted by regulating lipid metabolism. High-coverage targeted lipidomics provided a non-invasive tool for discovery of lipid markers to improve the predictive efficacy of TCM therapy.

Aziridination Reactivity of a Manganese(II) Complex with a Bulky Chelating Bis(Alkoxide) Ligand.

Treatment of Mn(N(SiMe3)2)2(THF)2 with bulky chelating bis(alkoxide) ligand [1,1′:4′,1′′-terphenyl]-2,2′′-diylbis(diphenylmethanol) (H2[O-terphenyl-O]Ph) formed a seesaw manganese(II) complex Mn[O-terphenyl-O]Ph(THF)2, characterized by structural, spectroscopic, magnetic, and analytical methods. The reactivity of Mn[O-terphenyl-O]Ph(THF)2 with various nitrene precursors was investigated. No reaction was observed between Mn[O-terphenyl-O]Ph(THF)2 and aryl azides. In contrast, the treatment of Mn[O-terphenyl-O]Ph(THF)2 with iminoiodinane PhINTs (Ts = p-toluenesulfonyl) was consistent with the formation of a metal-nitrene complex. In the presence of styrene, the reaction led to the formation of aziridine. Combining varying ratios of styrene and PhINTs in different solvents with 10 mol% of Mn[O-terphenyl-O]Ph(THF)2 at room temperature produced 2-phenylaziridine in up to a 79% yield. Exploration of the reactivity of Mn[O-terphenyl-O]Ph(THF)2 with various olefins revealed (1) moderate aziridination yields for p-substituted styrenes, irrespective of the electronic nature of the substituent; (2) moderate yield for 1,1′-disubstituted α-methylstyrene; (3) no aziridination for aliphatic α-olefins; (4) complex product mixtures for the β-substituted styrenes. DFT calculations suggest that iminoiodinane is oxidatively added upon binding to Mn, and the resulting formal imido intermediate has a high-spin Mn(III) center antiferromagnetically coupled to an imidyl radical. This imidyl radical reacts with styrene to form a sextet intermediate that readily reductively eliminates the formation of a sextet Mn(II) aziridine complex.

Start-Up and Performance of a Full Scale Passive System In-Cluding Biofilters for the Treatment of Fe, as and Mn in a Neutral Mine Drainage

Passive mine drainage treatment plants are the scene of many chemical and biological reactions. Here, the establishment of iron (Fe), arsenic (As), and manganese (Mn) removal was monitored immediately after the commissioning of the Lopérec (Brittany, France) passive water treatment plant, composed of aeration cascades and settling ponds followed by pozzolana biofilters. Iron and As were almost completely removed immediately after commissioning, while Mn removal took more than 28 days to reach its maximum performance. Investigations were performed during two periods presenting strong variations in feeding flow-rates: from 2.8 m3.h−1 to 8.6 m3.h−1 and from 13.2 m3.h−1 to 31.3 m3.h−1. Design flow rate was reached during the first week of the second period. Dissolved Fe and As were not affected by the decrease in residence time while Mn was only slightly affected. Microbial communities in biofilter presented similarities with those of the pond sludge, and genera including Mn-oxidizing species were detected. Proportion of bacteria carrying the aioA gene encoding for As(III)-oxidase enzyme increased in communities during the second period. Results suggest Mn removal is mainly associated with bio-oxidation whereas removal of Fe and As could be mainly attributed to chemical oxidation and precipitation of Fe, possibly helped by As(III) bio-oxidation.

Mn3Ag(1-)Cu()N antiperovskite thin films with ultra-low temperature coefficient of resistance

• First report on the reactive sputter deposition and post-deposition heat treatment of Mn 3 Ag (1- x ) Cu ( x ) N thin films for ultra-low TCR application. • Increasing Cu doping concentration in Mn 3 Ag (1- x ) Cu ( x ) N controls stabilization of the manganese oxide upper surface layer. • The extent of upper surface oxidation and crystallization of the underlying thin film are competing events to fine tune the electrical properties. • Optimising the post-deposition heat treatment temperature results in TCR values better than ±5 ppm/°C and resistance stability of less than 1%. We demonstrate the first successful attempt to partially substitute Cu into the Mn 3 AgN-antiperovskite system to form Mn 3 Ag (1- x ) Cu ( x ) N thin films with an ultra-low temperature coefficient of resistance (TCR) for fabrication of ultra-precise passive components. Films were grown by reactive magnetron sputtering on alumina and glass substrates and were found to be amorphous in nature with highly negative TCR of -233 to -351 ppm/°C in their as-grown state. Increasing Cu alloying from x =0 to 1, resulted in increased sheet resistance, a negative shift of TCR and a change of grain morphology from spherical to elongated. Post-deposition heat treatment at 300-375 °C, resulted in a positive shift of TCR and an ultra-low TCR of -4.66 ppm/°C for films with x =0.6. The heat treatment induces grain growth, surface roughness and the formation of a manganese oxide upper surface layer up until temperatures of 350 °C, after which surface oxidation begins to dominate. The growth rate of the surface layer is controlled by the Cu concentration and heat treatment temperature, which both play a central role in the development of these novel ultra-low TCR Mn 3 Ag (1- x ) Cu ( x ) N thin film structures.

Integrated Battery-Capacitor Electrodes: Pyridinic N-Doped Porous Carbon-Coated Abundant Oxygen Vacancy Mn-Ni-Layered Double Oxide for Hybrid Supercapacitors.

Integrating the battery behavior and supercapacitor behavior in a single electrode to obtain better electrochemical performance has been widely researched. However, there is still a lack of research studies on an integrated battery-capacitor supercapacitor electrode (BatCap electrode). In this work, an integrated BatCap electrode porous carbon-coated Mn-Ni-layered double oxide (Mn-Ni LDO-C) was fabricated successfully using controllable heat treatment of polypyrrole-precoated Mn-Ni-layered double hydroxide (Mn-Ni LDH@PPy). This Mn-Ni LDO-C electrode was grown on Ni foam directly and possessed a hierarchical structure that consisted of a pyridinic N (N-6)-doped porous carbon shell and a Mn-Ni LDO core within abundant oxygen vacancies. Benefiting from the synergistic effect of N-6-doped porous carbon and increased oxygen vacancies, Mn-Ni LDO-C exhibited excellent electrochemical performance. The capacity of Mn-Ni LDO-C reached 2.36 C cm-2 (1478.1 C g-1) at 1 mA cm-2 and remained at 92.1% of the initial capacity after 5000 cycles at a current density of 20 mA cm-2. The aqueous battery-supercapacitor hybrid device Mn-Ni LDO-C//active carbon (Mn-Ni LDO-C//AC) also presented superior cycle stability: it retained 85.3% of the original capacity after 5000 cycles at 2 A g-1. Meanwhile, Mn-Ni LDO-C//AC could work normally under a wider potential window (2.0 V), so that the device held the highest energy density of 78.2 Wh kg-1 at a power density of 499.7 W kg-1 and retained 39.1 Wh kg-1 at the highest power density of 31.3 kW kg-1. Two Mn-Ni LDO-C//AC devices connected in series could light a light-emitting diode (LED) bulb easily and keep the LED brightly illuminated for more than 10 min. In general, this work synthesized an integrated BatCap electrode Mn-Ni LDO-C; the integrated electrode exhibited high electrochemical performance, thus has a promising application prospect in the field of energy storage.

Tailoring, structural elucidation, DFT calculation, DNA interaction and pharmaceutical applications of some aryl hydrazone Mn(II), Cu(II) and Fe(III) complexes

The current research focuses on the treatment of Mn(II) Cu(II) and Fe(III) metal ions with 1-(Benzhydrylidene-hydrazonomethyl)-naphthalen-2-ol (aryl hydrazone DHPN) ligand, producing three new solid complexes with substantial yields. In all mononuclear crystalline metal chelates with high thermal stability, different characterization techniques including infrared, UV–visible and NMR spectroscopies, elemental analyses and TGA revealed a tetra-coordination in DPHNCu complex and six-coordination for DPHNMn and DPHNFe complexes. Calculations based on Density Functional Theory (DFT) were used and offered a satisfactory explanation to better understands the electronic and structural properties of these metal chelates. Moreover, electronic absorption spectroscopy, hydrodynamic and electrophoresis measurements have revealed significant interactions of these novel complexes with calf thymus DNA through different binding modes. Accordingly, the Kb and ΔGb≠ values of such interaction followed that order: DPHNFe > DPHNMn > DPHNCu complex. In addition to, antibathogenic studies of the new metal chelates revealed that the latter had considerably high efficacy than the corresponding hydrazone ligand. The anti-proliferative activity of the compounds studied was also tested against various cancer cell lines and showed substantial cytotoxic activity. Moreover, antioxidant activity findings showed that the compounds tested had anti-oxidative activity relative to regular ascorbic acid. Furthermore, docking study of the investigated DPHN ligand and its complexes was performed to get a first insight of the interaction in the active site of the protein enzyme of the bacteria and fungi receptors.

Comprehensive use of natural clinoptylolite in environmental protection technologies

With the expansion of the variety of environmentally friendly materials in environmental protection technologies, in particular in the processes of sorption and ion exchange, the use of native or modified forms of clinoptilolites is quite effective. Therefore, most research on zeolites focuses on the study of ion exchange and sorption properties of these materials for natural and wastewater treatment. Nevertheless, studies of the catalytic properties of these minerals are quite promising, which can be effectively used in the purification of gas emissions. Given the cheapness, availability, prevalence in Ukraine and high performance, modified zeolite-clinoptilolite can be successfully used as a catalyst for the oxidation of carbon monoxide, while providing a fundamentally waste-free environmentally friendly technology. Having a structure filled with channels with a large number of inlets on the surface, clinoptilolite is effectively used to absorb cations that can pass through the molecular window (3.5-4.8 Å), and to replace the exchange cations of the mineral itself. They are used in petrochemistry for dehumidification and purification of gases, in construction, for purification of natural and technical waters, for extraction of radionuclides, for improvement of quality of soils, as a feed additive. Successfully used in water treatment of heavy metal ions Mn, Cu, Cr. To increase the efficiency of extraction and expansion of a number of absorbed metal ions, modification of these materials is used in various ways.When combining zeolites with metal oxides embedded in their pores, due to the combination of structural-adsorption and physico-chemical properties, catalysts based on clinoptilolite are widely used.To evaluate the possibility of using the modified MnO2 natural zeolite of the Sokyrnytsia deposit as an oxide-manganese catalyst in the processes of catalytic oxidation of CO obtained by fixing a divalent manganese ion in the zeolite phase with its subsequent oxidation by permanganate ion, and its further application properties of unmodified and modified clinoptilolite.Versatility is provided not only by the possibility of obtaining a catalyst without pre-treatment of zeolite, using also spent sorbents for purification of manganese-containing natural waters, which are inherent in Ukraine, but also safety in case of burial or storage in landfills.

Treatment of manganese, in the presence or absence of iron, in acid and neutral mine drainage using raw vs half-calcined dolomite

Efficient removal of Mn from mine drainage is complex because of its high solubility minerals, especially in the presence of Fe. This study evaluates the comparative efficiency of raw and half-calcined dolomite for Mn removal in synthetic and real contaminated neutral drainage (CND) as well as in real acid mine drainage (AMD). Batch isotherms were used to evaluate the removal of Mn by raw and half-calcined dolomite, in the presence or the absence of Fe, in synthetic CND and in synthetic AMD. Batch kinetics tests were also performed, only for synthetic CND, in the absence of Fe. Raw dolomite showed limited efficiency in batch tests. Hence, only the half-calcined dolomite was used in column tests. Removal of Mn from synthetic CND (pH 6.84; 46.1 mg/L Mn) was effective for 106 days. For the following 119 days of monitoring, Mn was treated ≥95%. For Mn removal in real AMD (pH 2.40; 22.8 mg/L Mn and 679 mg/L Fe), half-calcined dolomite proved less effective. After 1 week, Mn, Ni and Zn were no longer treated, whereas after 3 weeks, the pH and the concentration of Cu in the final effluent were also no longer conform to the Canadian discharge criteria. In the same time, Co, Cr and Fe were still removed even after 8 weeks. For the real CND, Mn concentration decreased by >90% (0.65 mg/L at the inlet and 0.05 mg/L at the exit) with half-calcined dolomite. Therefore, half-calcined dolomite seems highly promising for the treatment of Mn in CND.

Characterization of Oxidation Behavior of Mn Fumes Generated in the Vacuum Treatment of Melting Mn Steels

Herein, the phase, composition, morphologies, particle size distribution, and specific surface area of Mn oxide fumes generated after the vacuum treatment of melting Mn steels with different initial Mn contents are characterized. The thermodynamic calculation results reveal that for a given temperature and pressure, Mn vapor generation increases with increasing initial Mn content in steel. Moreover, the experimental results find that the amount of the Mn oxide fumes on the vacuum chamber after vacuum processing gradually increases with increasing initial Mn content in the melt. The fumes on the crucible generated after vacuum processing are composed of mainly coral‐shaped Mn3O4 with the size of 500 nm and a small amount of spherical‐like Mn2O3 with the sizes of 50–200 nm. Meanwhile, the fumes deposited on the furnace chamber contain Mn nanoparticles with the sizes of less than 50 nm, MnO nanorods with the sizes of 50–200 nm, and Mn3O4 nanoparticles with the sizes of 50–500 nm. In addition, the main phase of the fumes deposited on the vacuum chamber gradually changes to elemental Mn with an increase in the initial Mn content. The temperature and particle size are responsible for thermodynamic stability of Mn oxides at the nanoscale.

Recent Developments of Mn(II)-Doped 2D-Layered and 2D Platelet Perovskite Nanostructures

2D layered perovskites are recently emerged as one of the most promising materials for optoelectronics. These not only behave like a quantum well structures but also on doping Mn(II) ions at the Pb-site results highly emissive doped material. These structures can also be used as a starting material for obtaining 3D perovskites. Thermal treatment of Mn(II) incorporated layered perovskites in presence of Cs(I) ions led to Mn(II)-doped 2D platelets shaped perovskites, which also tune their dimensions with varying the dopant ion concentration. Keeping the importance of the 2D layered perovskites, this review focused on the basic structures to the recently developed synthetic strategies and their optical properties of layered structured perovskites, Mn(II)-doped layered perovskites and Mn(II)-doped 2D platelet shaped perovskites.

Analysis and Optimization of Mn Removal from Contaminated Solid Matrixes by Electrokinetic Remediation.

Electrokinetic remediation is a useful technique for the removal of ionic contaminants in soils, sediments, sludges, and other solid porous matrixes. The efficiency of metal removal and the electricity consumption in the electrokinetic treatment of soils largely depend on electric and physicochemical conditions. This study analyzes the electrokinetic treatment of Mn contaminated kaolinite clay specimen and the influence of voltage, current intensity, moisture content, pH, and facilitating agents on metal removal and energy consumption. The objective of this study is to identify the influence of the typical variables used in electrokinetic remediation. The results showed that the operation at constant voltage or constant current intensity were equivalent in terms of metal removal and energy consumption, as long as the electric field intensity was kept low to minimize the consumption in parallel electrochemical reactions, especially the electrolysis of water. The moisture content had a significant influence on the Mn removal. Moisture content higher that 50 percent resulted in very effective Mn removal as compared with kaolinite specimens with lower moisture. The control of pH in the electrolyte solutions and the addition of facilitating agents (organic acids) enhanced the removal of Mn but increased the electric energy cost. Overall, the best conditions for Mn removal involved low to moderate electric potential difference (10 to 30 V), the use of citric acid as the facilitating agent, and the pH control in the cathode at a slightly acid pH. The electrokinetic treatment of a sludge from a water treatment plant contaminated with Mn was effective when pH control on the cathode was used. Mn and various metals (66% of Mn, 30% of Cu, 56% of Zn, 21% Sr, and 21% of Fe) were removed with moderate electricity and acid consumption.

Adsorption of manganese and zinc in synthetic wastewater by tea waste (TW) as a low cost adsorbent

In this study, tea waste (TW) is investigated as a low cost adsorbent for the treatment of Mn(II) and Zn(II) in synthetic wastewater. Experimental design, the variables are the adsorbent dosage (0.5g, 1.0g, 1.5g, 2.0g, 2.5g and 3.0g) and contact time (20, 40, 60, 80, 100 and 120 minutes). The percentage of heavy metal ions removal in the solution are measured using DR2800 Spectrophotometer. Adsorption Isotherm and Adsorption Kinetic modelling are applied to further prove the correlation of the experimental data obtained for the removal of Mn(II) and Zn(II). The equilibrium data satisfactorily fitted into Langmuir Isotherm model for both Mn(II) and Zn(II) with R2 value of 0.9906 and 0.9854, respectively. Based on the result, TW is capable to adsorb more than 90% of both Mn(II) and Zn(II) at optimum dosage of 2g/100ml. The kinetic studies show that the absorption mechanisms satisfied the Pseudo-Second-Order model and have the best equilibrium data with R2 value of 0.9998 and 1.0000 for Mn(II) and Zn(II), respectively. The maximum adsorption achieved at 60 minutes for Mn(II) and 80 minutes for Zn(II). Thus, the Langmuir Isotherm and Pseudo-Second-Order Kinetic models proved that TW is capable of being an efficient and effective adsorbent for Mn(II) and Zn(II) removal in synthetic wastewater.

Correction to: A Single-Molecule Magnet Tetranuclear [MnIII3MnIVO3Cl] Complex with Bis(diisopropylphosphinyl)imide Ligands

Treatment of Mn(OAc)2·4H2O with 3 equiv. HN(iPr2PO)2 in the presence of nBu4NCl in acetonitrile resulted in isolation of a tetranuclear {Mn3IIIMnIV} complex [Mn4(μ3-O)3(μ3-Cl)(μ-OAc)3{N(iPr2PO)2}3]·0.5C6H14 (1·0.5C6H14), and a dinuclear {MnIIMnIII} complex [Mn2{N(iPr2PO)2}{μ2,η3-(iPrPO2)NH(iPr2PO)}2{η2-(iPrPO2)NH(iPr2PO)}2]·0.25AcOH (2·0.25AcOH) with bis(diisopropylphosphinyl)imide ligands. The solid-state structures of two complexes have been established by single-crystal X-ray crystallography. The tetranuclear complex 1 belongs to a family of {Mn3IIIMnIVO3X} single-molecule magnets (SMMs) with effective energy barrier of 14.3 K by some further magnetic characterizations. A [Mn3IIIMnIVO3Cl]-core-based [Mn4(μ3-O)3(μ3-Cl)(OAc)3{N(iPr2PO)2}3] complex with single-molecule magnet (SMM) behaviour was prepared and structurally characterized, exhibiting slow magnetization relaxation under zero applied dc field with τ0 = 9.0 × 10−7 s and relaxation barrier Ueff = 14.3 K.

Analysis of manganese oxidase and its encoding gene in Lysinibacillus strain MK-1

Manganese (Mn) is one of the most abundant transitional metals in the crust of the Earth and Mn contamination is occurring in groundwater worldwidely. The removal of manganese is mainly achieved by catalytic oxidation of manganese-oxidizing bacteria. As a result, biological Mn-removal technology has attracted increased attention due to its high efficiency and convenience. Several species of bacteria, including Bacillus and Pseudomonas, have the ability to oxidize Mn. A bacterial strain MK-1 from Lysinibacillus, capable of oxidizing 98% of Mn under optimal conditions (1mmol/L of Mn(II), pH 7.0, 3days), was obtained from a mine located in Hunan province, and a gene, mokA, putatively encoding a manganese oxidase, was identified. The MokA enzyme produced by mokA is a CotA-like multicopper oxidase (MCO) that exhibited significantly different expression profiles in medium with and without Mn(II). Sequence analysis of MokA revealed that it is structurally similar to previously reported manganese oxidases. The results of this study broaden the taxonomic range manganese-oxidizing bacteria. Based on these results, our findings suggested that MK-1 might be applied for the treatment of Mn(II)-contaminated water.

A Single-Molecule Magnet Tetranuclear [MnIII3MnIVO3Cl] Complex with Bis(diisopropylphosphinyl)imide Ligands

Treatment of Mn(OAc)2·4H2O with 3 equiv. HN(iPr2PO)2 in the presence of nBu4NCl in acetonitrile resulted in isolation of a tetranuclear {Mn 3 III MnIV} complex [Mn4(μ3-O)3(μ3-Cl)(μ-OAc)3{N(iPr2PO)2}3]·0.5C6H14 (1·0.5C6H14), and a dinuclear {MnIIMnIII} complex [Mn2{N(iPr2PO)2}{μ2,η3-(iPrPO2)NH(iPr2PO)}2{η2-(iPrPO2)NH(iPr2PO)}2]·0.25AcOH (2·0.25AcOH) with bis(diisopropylphosphinyl)imide ligands. The solid-state structures of two complexes have been established by single-crystal X-ray crystallography. The tetranuclear complex 1 belongs to a family of {Mn 3 III MnIVO3X} single-molecule magnets (SMMs) with effective energy barrier of 14.3 K by some further magnetic characterizations. A [Mn 3 III MnIVO3Cl]-core-based [Mn4(μ3-O)3(μ3-Cl)(OAc)3{N(iPr2PO)2}3] complex with single-molecule magnet (SMM) behaviour was prepared and structurally characterized, exhibiting slow magnetization relaxation under zero applied dc field with τ0 = 9.0 × 10−7 s and relaxation barrier Ueff = 14.3 K.

The combined treatment of Mn and Al alleviates the toxicity of Al or Mn stress alone in barley

Aluminum (Al) and manganese (Mn) toxicity commonly coexists in acid soil, so the crop cultivars suitable for planting in acid soil should show high tolerance to both elements simultaneously. However, it is still not clear if the toxicity of Mn and Al on plant growth is antagonistic or synergistic, and the plants with Al tolerance are also tolerant to Mn toxicity. In this study, three barley genotypes (one Tibetan wild and two cultivated), differing in Al tolerance, were characterized for growth and physiological responses to Al or Mn toxicity as well as the combined treatment of the two toxic elements. Interestingly, it has been found that the combined treatment of both metals was less affected in comparison with Al or Mn treatment alone, in terms of plant growth, Al or Mn concentration in plant tissues, and photosynthetic parameters, indicating antagonistic interaction of Al and Mn for their effect on plant growth and physiological traits. The results also showed that there was a dramatic difference among barley genotypes in Mn toxicity tolerance and XZ16 showed much higher tolerance than other two genotypes. High Mn tolerance is mainly described to less Mn uptake and lower Mn concentration in plants, and Mn tolerance is independent of Al tolerance.