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Journal articles on the topic 'Divalent metal ions release'

Author: Grafiati

Published: 8 June 2024

Last updated: 31 July 2025

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1

Mustafa, S., B. Dilara, A. Naeem, N. Rehana, and K. Nargis. "Temperature and pH Effect on the Sorption of Divalent Metal Ions by Silica Gel." Adsorption Science & Technology 21, no. 4 (2003): 297–307. http://dx.doi.org/10.1260/026361703322405033.

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The sorption of Zn2+, Ni2+ and Cd2+ ions by silica gel was studied as a function of ion concentration, pH and temperature. An increase in all three parameters led to an increase in the extent of sorption for all the metal cations studied. The selectivity of the solid was observed to be in the order Zn2+ > Ni2+ > Cd2+. Sorption of the metal cations was accompanied by the release of H+ ions into the bulk phase. On average two moles of H+ ions were released per mole of metal cation sorbed. The sorption data fitted the linear forms of both the Kurbatov and Langmuir adsorption equations. The

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2

Kim, Bongsu, and Tae Hyun Kim. "Electrochemical Studies for Cation Recognition with Diazo-Coupled Calix[4]arenes." Journal of Analytical Methods in Chemistry 2015 (2015): 1–7. http://dx.doi.org/10.1155/2015/579463.

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The electrochemical properties of diazophenylcalix[4]arenes bearingortho-carboxyl group (o-CAC) andortho-ester group (o-EAC), respectively, in the presence of various metal ions were investigated by voltammetry in CH3CN.o-CAC ando-EAC showed voltammetric changes toward divalent metal ions and no significant changes with monovalent alkali metal ions. However,o-CAC preferentially binds with alkaline earth and transition metal ions, whereas no significant changes in voltammetric signals are observed ino-EAC with alkaline earth metal ions.o-EAC only binds with other transition metal ions. This can

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3

Knape, Matthias J., Mike Ballez, Nicole C. Burghardt, et al. "Divalent metal ions control activity and inhibition of protein kinases." Metallomics 9, no. 11 (2017): 1576–84. http://dx.doi.org/10.1039/c7mt00204a.

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Metals like Zn<sup>2+</sup> and Mn<sup>2+</sup> can assist in the catalytic cycle of a protein kinase by facilitating substrate binding and phosphotransfer, however, in contrast to Mg<sup>2+</sup> they also hamper product release.

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4

Sieme, Daniel, Christian Griesinger, and Nasrollah Rezaei-Ghaleh. "Metal Binding to Sodium Heparin Monitored by Quadrupolar NMR." International Journal of Molecular Sciences 23, no. 21 (2022): 13185. http://dx.doi.org/10.3390/ijms232113185.

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Heparins and heparan sulfate polysaccharides are negatively charged glycosaminoglycans and play important roles in cell-to-matrix and cell-to-cell signaling processes. Metal ion binding to heparins alters the conformation of heparins and influences their function. Various experimental techniques have been used to investigate metal ion-heparin interactions, frequently with inconsistent results. Exploiting the quadrupolar 23Na nucleus, we herein develop a 23Na NMR-based competition assay and monitor the binding of divalent Ca2+ and Mg2+ and trivalent Al3+ metal ions to sodium heparin and the con

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Xu, Kui, Mi Zhou, Ming Li, Weizhen Chen, Yabin Zhu, and Kaiyong Cai. "Metal-phenolic networks as a promising platform for pH-controlled release of bioactive divalent metal ions." Applied Surface Science 511 (May 2020): 145569. http://dx.doi.org/10.1016/j.apsusc.2020.145569.

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6

Dahal, Madhav P., Geoffrey A. Lawrance, and Marcel Maeder. "Kinetics of Heavy Metal Ion Adsorption on to, and Proton Release from, Electrolytic Manganese Dioxide." Adsorption Science & Technology 16, no. 1 (1998): 39–50. http://dx.doi.org/10.1177/026361749801600106.

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The kinetics of adsorption of lead(II), as well as of copper (II), zinc(II) and thallium(I), on commercial electrolytic manganese dioxide (EMD) powder of different size fractions has been followed by a pH-stat method involving the computer-controlled neutralisation of released protons from the EMD at a fixed pH with hydroxide ion. Base uptake versus time profiles in all cases indicated a rapid initial change followed by a slower process. These can be interpreted in terms of either a solution kinetic model or an adsorption kinetic model. In the former analysis, the adsorption-time profile can b

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7

Chou, Chiu L., John F. Uthe, and Robert D. Guy. "Determination of Free and Bound Cd, Zn, Cu, and Ag Ions in Lobster (Homarus americanus) Digestive Gland Extracts by Gel Chromatography Followed by Atomic Absorption Spectrophotometry and Polarography." Journal of AOAC INTERNATIONAL 76, no. 4 (1993): 794–98. http://dx.doi.org/10.1093/jaoac/76.4.794.

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Abstract Gel-permeation chromatography followed by atomic absorption spectrophotometric and polarographic analyses were used to measure free and bound divalent metal ions in lobster digestive gland extracts prepared with or without oc-toluenesulfonyl fluoride, a protease inhibitor. Chromatography on Sephadex G-50 or G-100 yielded 3 UV-absorbing peaks, which corresponded, respectively, to the void volume, a medium molecular weight fraction, and a low molecular weight fraction that contained free divalent metal ions. In protease-inhibited extracts, only Zn+2 was found, whereas Cd, Cu, and Ag wer

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8

Facchin, F., S. Catalani, E. Bianconi, et al. "Albumin as marker for susceptibility to metal ions in metal-on-metal hip prosthesis patients." Human & Experimental Toxicology 36, no. 4 (2016): 319–27. http://dx.doi.org/10.1177/0960327116650011.

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Metal-on-metal (MoM) hip prostheses are known to release chromium and cobalt (Co), which negatively affect the health status, leading to prosthesis explant. Albumin (ALB) is the main serum protein-binding divalent transition metals. Its binding capacity can be affected by gene mutations or modification of the protein N-terminal region, giving the ischaemia-modified albumin (IMA). This study evaluated ALB, at gene and protein level, as marker of individual susceptibility to Co in MoM patients, to understand whether it could be responsible for the different management of this ion. Co was measure

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9

YAMADA, Masaki, Noriyuki KISHII, Koji ARAKI, and Shinsaku SHIRAISHI. "Extraction and release of divalent metal ions by 6,6'-diamino-2,2'-bipyridine supported on polymer beads." NIPPON KAGAKU KAISHI, no. 6 (1989): 988–92. http://dx.doi.org/10.1246/nikkashi.1989.988.

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10

Torabi, Seyed-Fakhreddin, Peiwen Wu, Claire E. McGhee, et al. "In vitro selection of a sodium-specific DNAzyme and its application in intracellular sensing." Proceedings of the National Academy of Sciences 112, no. 19 (2015): 5903–8. http://dx.doi.org/10.1073/pnas.1420361112.

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Over the past two decades, enormous progress has been made in designing fluorescent sensors or probes for divalent metal ions. In contrast, the development of fluorescent sensors for monovalent metal ions, such as sodium (Na+), has remained underdeveloped, even though Na+is one the most abundant metal ions in biological systems and plays a critical role in many biological processes. Here, we report the in vitro selection of the first (to our knowledge) Na+-specific, RNA-cleaving deoxyribozyme (DNAzyme) with a fast catalytic rate [observed rate constant (kobs) ∼0.1 min−1], and the transformatio

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11

Singh, Sarita, Jyoti Singh, Sunita Gulia, and Rita Kakkar. "Metal Ion Selectivity of Kojate Complexes: A Theoretical Study." Journal of Theoretical Chemistry 2013 (July 7, 2013): 1–9. http://dx.doi.org/10.1155/2013/342783.

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Density functional calculations have been performed on four-coordinate kojate complexes of selected divalent metal ions in order to determine the affinity of the metal ions for the kojate ion. The complexation reactions are characterized by high energies, showing that they are highly exothermic. It is found that Ni(II) exhibits the highest affinity for the kojate ion, and this is attributed to the largest amount of charge transfer from the ligand to the metal ion. The Ni(II) complex has distorted square planar structure. The HOMOs and LUMOs of the complexes are also discussed. All complexes di

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12

Selvakumar, Dharani, and Muthulakshmi Andal Narasimhan. "Potential Utilization of Eco Benign Material as Effective Divalent Ions Encapsulant from Aqueous Matrix and Industrial Effluent." Oriental Journal Of Chemistry 41, no. 2 (2025): 675–88. https://doi.org/10.13005/ojc/410237.

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Release of toxicants from multiple sectors into water streams cause adverse effects in the environment. In recent years, due to their great persistence and toxic nature, heavy metals are considered as a major threat generated from diverse industrial units. Amongst various pollutants, high level of heavy metal (Zn, Pb, Hg, Ni, Cu & Fe) contamination create numerous health hazards like immune system dysfunction, gastrointestinal problems, birth defects, nervous disorders and thereby affecting surface water quality. This study is centred on the preparation of magnetite composite using chemica

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13

Yadav, Bhupendra Narayan Singh, Priyanka Sharma, Shristy Maurya, and Rajiv Kumar Yadav. "FUNCTIONAL METATRANSCRIPTOMICS REVEALS A NOVEL MULTI METAL TOLERANT GENE OF NRAMP-FAMILY, ISOLATED FROM METAL-CONTAMINATED SOIL." Applied Biological Research 26, no. 2 (2024): 186–98. http://dx.doi.org/10.48165/abr.2024.26.01.22.

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The continuous release of heavy metal pollutants into soil through human activities posesthreat to both macro- and micro-organisms within the ecosystem. Functional metatranscriptomics is a robust method for discovering novel genes associated with a particular biological process. In this study, functional meta transcriptomic approach was employed to isolate a gene from size-fractionated cDNA libraries of micro-eukaryotes. The cDNA libraries were raised using high-quality RNA from heavy metal-contaminated soil. The identified gene aligned with Nramp (Natural resistance associated macrophage prot

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14

Xiong, Wenming, Yongjun Li, Jidong Ying, Chuxia Lin, and Junhao Qin. "Behaviors of Organic Ligands and Phosphate during Biochar-Driven Nitrate Adsorption in the Presence of Low-Molecular-Weight Organic Acids." Molecules 27, no. 18 (2022): 5811. http://dx.doi.org/10.3390/molecules27185811.

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A batch experiment was conducted to examine the behavior of nitrate, organic ligands, and phosphate in the co-presence of biochar and three common low-molecular-weight organic acids (LMWOAs). The results show that citrate, oxalate, and malate ions competed with nitrate ion for the available adsorption sites on the biochar surfaces. The removal rate of LMWOA ligands by the biochar via adsorption grew with increasing solution pH. The adsorbed divalent organic ligands created negatively charged sites to allow binding of cationic metal nitrate complexes. A higher degree of biochar surface protonat

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15

Zygiel, Emily M., and Elizabeth M. Nolan. "Transition Metal Sequestration by the Host-Defense Protein Calprotectin." Annual Review of Biochemistry 87, no. 1 (2018): 621–43. http://dx.doi.org/10.1146/annurev-biochem-062917-012312.

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In response to microbial infection, the human host deploys metal-sequestering host-defense proteins, which reduce nutrient availability and thereby inhibit microbial growth and virulence. Calprotectin (CP) is an abundant antimicrobial protein released from neutrophils and epithelial cells at sites of infection. CP sequesters divalent first-row transition metal ions to limit the availability of essential metal nutrients in the extracellular space. While functional and clinical studies of CP have been pursued for decades, advances in our understanding of its biological coordination chemistry, wh

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16

Sultana, Ruhi, and Lauren F. Greenlee. "(Digital Presentation) Enhanced Electrochemical Phosphate Recovery from Wastewater: Implications of Pulsating Anode Potential." ECS Meeting Abstracts MA2022-01, no. 40 (2022): 1813. http://dx.doi.org/10.1149/ma2022-01401813mtgabs.

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Electrochemical recovery of phosphorus (P) as struvite (or magnesium ammonium phosphate hexahydrate, MgNH4PO4.6H2O) fertilizer using a sacrificial pure magnesium (Mg) anode is considered a sustainable strategy to deal with the limited availability of rock phosphate. However, the formation of an electrically passive film of magnesium hydroxide (Mg(OH)2) and/or struvite on the surface of Mg upon immediate immersion in aqueous phosphate solution limits the release of divalent Mg ions and decreases struvite precipitation. The present work highlights struvite recovery by an electrochemical method u

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17

Zhang, Jiao, Pan Wang, Zhiqiang Zhang, Pengyu Xiang, and Siqing Xia. "Biosorption Characteristics of Hg(II) from Aqueous Solution by the Biopolymer from Waste Activated Sludge." International Journal of Environmental Research and Public Health 17, no. 5 (2020): 1488. http://dx.doi.org/10.3390/ijerph17051488.

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The divalent mercury ion (Hg(II)) is one of the most hazardous toxic heavy-metal ions, and an important industrial material as well. It is essential to remove and recover Hg(II) from wastewater before it is released into the environment. In this study, the biosorption characteristics of Hg(II) from aqueous solution by the biopolymer from waste activated sludge (WAS) are investigated. The major components of the biopolymer consisted of proteins, carbohydrates, and nucleic acids. The adsorption kinetics fit for the pseudo-second-order kinetic model, and the adsorption isotherms were well describ

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18

Liu, Yao-Jen, Wen-Ta Su, and Po-Hung Chen. "Magnesium and zinc borate enhance osteoblastic differentiation of stem cells from human exfoliated deciduous teeth in vitro." Journal of Biomaterials Applications 32, no. 6 (2017): 765–74. http://dx.doi.org/10.1177/0885328217740730.

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Various biocompatible and biodegradable scaffolds blended with biochemical signal molecules with adequate osteoinductive and osteoconductive properties have attracted significant interest in hard tissue engineering regeneration. We evaluated the distinct effects of magnesium borate, zinc borate, and boric acid blended into chitosan scaffold for osteogenic differentiation of stem cells from exfoliated deciduous teeth. Stem cells from exfoliated deciduous teeth cells are a potential source of functional osteoblasts for applications in bone tissue engineering, but the efficiency of osteoblastic d

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19

Tomson, Mason B., Amy T. Kan, Gongmin Fu, et al. "Mechanistic Understanding of Rock/Phosphonate Interactions and Effect of Metal Ions on Inhibitor Retention." SPE Journal 13, no. 03 (2008): 325–36. http://dx.doi.org/10.2118/100494-pa.

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Summary This paper discusses the effects of Ca2+, Mg2+, and Fe2+ on inhibitor retention and release. Better understanding of phosphonate reactions during inhibitor squeeze treatments has direct implication on how to design and improve scale inhibitor squeeze treatments for optimum scale control. Putting various amounts of metal ions in the inhibitor pill adds another degree of freedom in squeeze design, especially in controlling return concentrations and squeeze life. Phosphonate reactions during squeeze treatments involve a series of self-regulating reactions with calcite and other minerals.

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20

Hong, Dae Ki, A. Ra Kho, Song Hee Lee, et al. "Pathophysiological Roles of Transient Receptor Potential (Trp) Channels and Zinc Toxicity in Brain Disease." International Journal of Molecular Sciences 24, no. 7 (2023): 6665. http://dx.doi.org/10.3390/ijms24076665.

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Maintaining the correct ionic gradient from extracellular to intracellular space via several membrane-bound transporters is critical for maintaining overall cellular homeostasis. One of these transporters is the transient receptor potential (TRP) channel family that consists of six putative transmembrane segments systemically expressed in mammalian tissues. Upon the activation of TRP channels by brain disease, several cations are translocated through TRP channels. Brain disease, especially ischemic stroke, epilepsy, and traumatic brain injury, triggers the dysregulation of ionic gradients and

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21

Bramley, T. A., D. Stirling, I. A. Swanston, G. S. Menzies, and D. T. Baird. "Specific binding sites for LH/chorionic gonadotrophin, low-density lipoprotein, prolactin and FSH in homogenates of human corpus luteum. I: Validation of methods." Journal of Endocrinology 113, no. 2 (1987): 305–15. http://dx.doi.org/10.1677/joe.0.1130305.

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ABSTRACT The specific binding of 125I-labelled human chorionic gonadotrophin (hCG), human low-density lipoprotein (hLDL), human FSH (hFSH) and human prolactin (hPRL) to homogenates of human corpus luteum tissue was measured. Specific binding of 125I-labelled hCG was dependent on the temperature and duration of incubation, was inhibited by divalent metal ions or chelating agents, and increased linearly with homogenate concentration. Recovery of bound hormone was more effective using Millipore filtration or polyethylene glycol precipitation compared with centrifugation alone. Binding of 125I-lab

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22

Juntachai, Weerapong, Takahiro Oura, and Susumu Kajiwara. "Purification and characterization of a secretory lipolytic enzyme, MgLIP2, from Malassezia globosa." Microbiology 157, no. 12 (2011): 3492–99. http://dx.doi.org/10.1099/mic.0.054528-0.

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Malassezia globosa is a lipid-dependent yeast that is found on the human skin and is associated with various skin disorders, including dandruff and seborrhoeic dermatitis (SD). Despite its important role in skin diseases, the molecular basis for its pathogenicity is poorly understood. The current hypothesis is that dandruff and SD are linked to fatty acid metabolism and secretory lipolytic enzymes, which hydrolyse sebaceous lipids and release irritating free fatty acids. A previous genomic analysis of M. globosa identified a family of 13 homologous genes predicted to encode secreted lipases. W

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23

Bayeshova, A., A. Bayeshov, A. Kadirbayeva, and F. Zhumabay. "Dissolution of iron in sodium chloride solution during alternating current polarization." Kompleksnoe Ispolʹzovanie Mineralʹnogo syrʹâ/Complex Use of Mineral Resources/Mineraldik Shikisattardy Keshendi Paidalanu 318, no. 3 (2021): 51–62. http://dx.doi.org/10.31643/2021/6445.28.

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Iron compounds are widely used in many industries and engineering, and even in medicine. The existing methods of obtaining iron compounds are multi-stage and complex. The purpose of this work is to obtain iron (II) hydroxide and oxide from metal waste under alternating current action using one and two half-cycles. For the first time, the electrochemical behavior of iron electrode was studied by electrolysis method during alternating current polarization of industrial frequency in sodium chloride solutions. The iron polarization was carried out in pair with titanium, while the current density o

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24

Eric, R. H. "Chromous capacities of ferrochromium and matte smelting slags." Archives of Materials Science and Engineering 2, no. 93 (2018): 49–58. http://dx.doi.org/10.5604/01.3001.0012.7354.

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Purpose: of this paper is to extend the slag capacity concept to sparingly soluble cationic species encountered for example in matte smelting and ferrochromium processing in terms of chromous capacities. Design/methodology/approach: In this context in order to develop the chromous capacity the experimental data on slag-metal equilibrium for ferrochromium smelting and on chromium distribution between slag and matte phases encountered in sulphide smelting of PGM (Platinum Group Metals) and chromium containing copper nickel concentrates were used. Findings: The calculated chromous capacities were

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25

Zeng, Xiaoyan, Hedi An, Fei Yu, et al. "Benefits of Iron Chelators in the Treatment of Parkinson’s Disease." Neurochemical Research 46, no. 5 (2021): 1239–51. http://dx.doi.org/10.1007/s11064-021-03262-9.

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AbstractAs a novel discovered regulated cell death pattern, ferroptosis has been associated with the development of Parkinson’s disease (PD) and has attracted widespread attention. Nevertheless, the relationship between ferroptosis and PD pathogenesis is still unclear. This study aims to investigate the effect of iron overload on dopaminergic (DA) neurons and its correlation with ferroptosis. Here we use nerve growth factor (NGF) induced PC12 cells which are derived from pheochromocytoma of the rat adrenal to establish a classical PD in vitro model. We found significantly decreased cell viabil

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26

Zuo, Pengjian, and Geping Yin. "Chelated electrolytes for divalent metal ions." Science 374, no. 6564 (2021): 156. http://dx.doi.org/10.1126/science.abi6643.

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27

Rosenbach, Hannah, Jan Borggräfe, Julian Victor, et al. "Influence of monovalent metal ions on metal binding and catalytic activity of the 10–23 DNAzyme." Biological Chemistry 402, no. 1 (2020): 99–111. http://dx.doi.org/10.1515/hsz-2020-0207.

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AbstractDeoxyribozymes (DNAzymes) are single-stranded DNA molecules that catalyze a broad range of chemical reactions. The 10–23 DNAzyme catalyzes the cleavage of RNA strands and can be designed to cleave essentially any target RNA, which makes it particularly interesting for therapeutic and biosensing applications. The activity of this DNAzyme in vitro is considerably higher than in cells, which was suggested to be a result of the low intracellular concentration of bioavailable divalent cations. While the interaction of the 10–23 DNAzyme with divalent metal ions was studied extensively, the i

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28

Strzelbicki, Jerzy, Witold Charewicz, Jorg Beger, and Lutz Hinz. "Transfer of divalent metal ions into the organic phase of the systems water–chloroform–ZnCl2–CdCl2–HgCl2–NaOH–(NaCl)–n-alkyltri(oxyethylene)carboxylic acid." Canadian Journal of Chemistry 66, no. 10 (1988): 2640–46. http://dx.doi.org/10.1139/v88-414.

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The influence of the length of an n-alkyl chain incorporated into the molecule of an n-alkyltri(oxyethylene) carboxylic acid of a general formula CnH(2n+1)(OCH2CH2)3OCH2CO2H(n = 6, 8, 10, and 12, respectively) on transfer of the zinc group element ions into chloroform was investigated. Metal ions were transferred from the aqueous solutions of ZnCl2, CdCl2, and HgCl2 at initial concentrations of 0.835 mM and 1.67 mM with, and without, added NaCl. From the aqueous solutions to which no NaCl was added, the selectivity of transfer of divalent metal ions into the organic phase was low.The selectivi

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Braha, Orit, Li-Qun Gu, Li Zhou, Xiaofeng Lu, Stephen Cheley, and Hagan Bayley. "Simultaneous stochastic sensing of divalent metal ions." Nature Biotechnology 18, no. 9 (2000): 1005–7. http://dx.doi.org/10.1038/79275.

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Mustafa, S., S. Murtaza, A. Naeem, and K. Farina. "Sorption of divalent metal ions on CrPO4." Journal of Colloid and Interface Science 283, no. 2 (2005): 287–93. http://dx.doi.org/10.1016/j.jcis.2004.09.049.

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Birdsall, W. J. "Complexes of theophylline with divalent metal ions." Inorganica Chimica Acta 99, no. 1 (1985): 59–62. http://dx.doi.org/10.1016/s0020-1693(00)86048-x.

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32

Hassan, Refat M., S. A. El-Shatoury, and M. Th Makhlouf. "Alginate Polyelectrolyte Ionotropic Gels-XII. Chromatographic Separation of Divalent Transition Metal Ions using Alginates as Ion Exchangers." High Performance Polymers 4, no. 1 (1992): 49–54. http://dx.doi.org/10.1088/0954-0083/4/1/006.

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The separation of divalent metal ion mixtures has been investigated chromatographically on columns of either gel or sol forms of alginate polyelectrolyte. Separation was obtained in the form of narrow sharp zones for the metal ions. Ion exchange selectivity indicated that Cu2+ ions were most strongly retained among the divalent metal ions studied. The factors which affect the ion exchange selectivity, such as the strength of chelation and the mobility and radii of the metal ions, are discussed. The selectivity coefficient for the separation of a mixture of Cu2+ and Co2+ ions on columns of calc

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Yussupov, Khalidilla, Erbolat Aben, Dalelkhan Akhmetkanov, Khairulla Abenk, and Saltanat Yussupova. "Investigation of the solid oxidizer effect on the metal geotechnology efficiency." Mining of Mineral Deposits 17, no. 4 (2023): 12–17. http://dx.doi.org/10.33271/mining17.04.012.

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Purpose. The research is aimed at increasing the useful component content in a pregnant solution during in-situ leaching (ISL) using a solid oxidizer and increasing the ferric iron concentration in the leaching solution based on laboratory research. Methods. Laboratory research is performed on a specially developed model electrolyzer for obtaining comparative data on divalent iron oxidation to trivalent iron and the change in the useful component content in a pregnant solution. Firstly, tests are conducted with a basic leaching solution, then on the oxidation of the leaching solution with a so

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Mustafa, S., P. Shahida, A. Naeem, B. Dilara, and N. Rehana. "Sorption Studies of Divalent Metal Ions on ZnO." Langmuir 18, no. 6 (2002): 2254–59. http://dx.doi.org/10.1021/la0014149.

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Wang, Guoshou, Wenta Su, Pohung Chen, and Teyang Huang. "Divalent Metal Ions Induced Osteogenic Differentiation of MC3T3E1." IOP Conference Series: Materials Science and Engineering 275 (December 2017): 012004. http://dx.doi.org/10.1088/1757-899x/275/1/012004.

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Naeem, A., S. Mustafa, N. Rehana, B. Dilara, and S. Murtaza. "The Sorption of Divalent Metal Ions on AlPO4." Journal of Colloid and Interface Science 252, no. 1 (2002): 6–14. http://dx.doi.org/10.1006/jcis.2002.8425.

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Ashfaq, Ahsan, Taseer Ahmed Khan, and Sadia Fatima. "Divalent Metal Ions; Key factor towards Pulmonary Tuberculosis." ANNALS OF ABBASI SHAHEED HOSPITAL AND KARACHI MEDICAL & DENTAL COLLEGE 26, no. 4 (2021): 186–91. http://dx.doi.org/10.58397/ashkmdc.v26i4.516.

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ABSTRACT  Introduction: In tuberculosis disease infection, trace elements perform a significant role as their insufficiencies may be related to weakened immunity. The purpose of this study was to compare demographic profile and divalent metal Ions in Tuberculosis and Non-Tuberculosis individuals. Methodology: This case control study was carried out on 345 subjects. Patients were grouped into two categories i.e. Pulmonary Tuberculosis (cases group) with 115 patients and without Pulmonary Tuberculosis (control group) with 230 subjects. Demographic and dietary profile was record

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Aberuagba, Adepeju, Enoch B. Joel, Adebayo J. Bello, Adedoyin Igunnu, Sylvia O. Malomo, and Femi J. Olorunniji. "Thermophilic PHP Protein Tyrosine Phosphatases (Cap8C and Wzb) from Mesophilic Bacteria." International Journal of Molecular Sciences 25, no. 2 (2024): 1262. http://dx.doi.org/10.3390/ijms25021262.

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Protein tyrosine phosphatases (PTPs) of the polymerase and histidinol phosphatase (PHP) superfamily with characteristic phosphatase activity dependent on divalent metal ions are found in many Gram-positive bacteria. Although members of this family are co-purified with metal ions, they still require the exogenous supply of metal ions for full activation. However, the specific roles these metal ions play during catalysis are yet to be well understood. Here, we report the metal ion requirement for phosphatase activities of S. aureus Cap8C and L. rhamnosus Wzb. AlphaFold-predicted structures of th

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Mandal, Suraj Kumar, and Shankar Prasad Kanaujia. "Structural and thermodynamic insights into a novel Mg²⁺–citrate-binding protein from the ABC transporter superfamily." Acta Crystallographica Section D Structural Biology 77, no. 12 (2021): 1516–34. http://dx.doi.org/10.1107/s2059798321010457.

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More than one third of proteins require metal ions to accomplish their functions, making them obligatory for the growth and survival of microorganisms in varying environmental niches. In prokaryotes, besides their involvement in various cellular and physiological processes, metal ions stimulate the uptake of citrate molecules. Citrate is a source of carbon and energy and is reported to be transported by secondary transporters. In Gram-positive bacteria, citrate molecules are transported in complex with divalent metal ions, whereas in Gram-negative bacteria they are translocated by Na+/citrate

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Lin, Lin, Lei Jiang, Hongzhen Guo, Li Yang, and Zizheng Liu. "Optimization of divalent metal cations for maximal concentration of Monacolin K in Monascus M1 by response surface methodology." Czech Journal of Food Sciences 37, No. 5 (2019): 312–18. http://dx.doi.org/10.17221/74/2019-cjfs.

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Inorganic salts are important factors in the growth and secondary metabolites production of microorganisms. This study investigated the influences of divalent metal cations, Mn2+, Zn2+, and Mg2+ on the cell growth and Monacolin K production in Monascus M1. Then the concentration of the three kinds of divalent metal cations was optimized by response surface methodology, and the optimum conditions for the highest production of Monacolin K were determined. The optimum concentrations of the three divalent metal ions were selected as follow: Mn2+ 0.33%, Zn2+ 0.16%, and Mg2+ 1%. In this condition th

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Demidov, O. O., A. V. Krasnopyorova, G. D. Yukhno, N. V. Efimova, and A. D. Roshal. "Flavonol assisted extraction of divalent and trivalent metal ions." Functional Materials 31, no. 4 (2024): 601–8. https://doi.org/10.15407/fm31.04.601.

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The work is devoted to investigations of extraction methods for the isolation and accumulation of divalent and trivalent metal ions Mn2+, Ni2+, Cu2+, Zn2+, Y3+ and Ce3+ in the absence and presence of flavonol derivatives with different numbers and locations of complexation sites. Two extraction methods were used and compared: the classical LL – water-organic phase (octanol) and the ATPS method – with two separated aqueous phases in the presence of polyethylene oxide 4000. It was shown that the presence of flavonols in the extraction system leads to a significant increase in the extraction effi

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Mel'gunov, V. I., E. I. Akimova, and K. S. Krasavchenko. "Effect of divalent metal ions on annexin-mediated aggregation of asolectin liposomes." Acta Biochimica Polonica 47, no. 3 (2000): 675–83. http://dx.doi.org/10.18388/abp.2000_3988.

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Annexins belong to a family of Ca2+- and phospholipid-binding proteins that can mediate the aggregation of granules and vesicles in the presence of Ca2+. We have studied the effects of different divalent metal ions on annexin-mediated aggregation of liposomes using annexins isolated from rabbit liver and large unilamellar vesicles prepared from soybean asolectin II-S. In the course of these studies, we have found that annexin-mediated aggregation of liposomes can be driven by various earth and transition metal ions other than Ca2+. The ability of metal ions to induce annexin-mediated aggregati

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Wang, Jian, and Yi Fan Zhang. "The Study of Divalent Metal Ion Catalysts on Phenol-Formaldehyde Resol Resins." Applied Mechanics and Materials 71-78 (July 2011): 818–21. http://dx.doi.org/10.4028/www.scientific.net/amm.71-78.818.

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The curing characteristic of phenol-formaldehyde resol resins catalyzed with magnesium hydroxide, calcium hydroxide and barium hydroxide was studied in this study.The effects of catalysts on chemical structure of phenol formaldehyde resin was investigated by fourier transform infrared.The results indicated that divalent metal ions catalysts played an important role influence both the cure rate and cure time.Phenol formaldehyde resin catalysed by diffierent catalysts showed diffierent addition of formaldehyde onto ortho positions of phenolic rings.The order of the divalent metal ions effectiven

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Mallet, A. M., A. B. Davis, D. R. Davis, J. Panella, K. J. Wallace, and M. Bonizzoni. "A cross reactive sensor array to probe divalent metal ions." Chemical Communications 51, no. 95 (2015): 16948–51. http://dx.doi.org/10.1039/c5cc05489c.

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Yoon, Yeo Woon, Jong Seung Kim, and Tae Hyun Kim. "Electrochemical Investigation of Anthraquinone-Based Chemodosimeter for Cu2+Metal Ion." Journal of Chemistry 2013 (2013): 1–5. http://dx.doi.org/10.1155/2013/830981.

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The electrochemical properties of an anthraquinone-containing Cu2+-promoted desulfurization chemodosimeter (AQCD) in the presence of various metal ions were investigated by voltammetry. AQCD showed voltammetric changes toward divalent metal ions (M2+), which are similar to those of anthraquinone (AQ) and 1-aminoanthraquinone (AQNH2) with the metal ions except Cu2+. This can be explained on the electrostatic interaction (AQCD-M2+) and chemodosimetric reaction (AQCD-Cu2+).

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Powell, J. J., R. Jugdaohsingh, and R. P. H. Thompson. "The regulation of mineral absorption in the gastrointestinal tract." Proceedings of the Nutrition Society 58, no. 1 (1999): 147–53. http://dx.doi.org/10.1079/pns19990020.

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The absorption of metal ions in the mammalian single-stomached gut is fortunately highly selective, and both luminal and tissue regulation occur. Initially, assimilation of metal ions in an available form is facilitated by the intestinal secretions, chiefly soluble mucus (mucin) that retards hydrolysis of ions such as Cu, Fe and Zn. Metal ions then bind and traverse the mucosally-adherent mucus layer with an efficiency M+> M2+> M3+. At the mucosa Fe3+is probably uniquely reduced to Fe2+, and all divalent cations (including Fe2+) are transported by a membrane protein (such as divalent cat

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Singh, Toolsee J. "Inhibition of glycogen synthase (casein) kinase-1 by divalent metal ions." Biochemistry and Cell Biology 66, no. 3 (1988): 238–43. http://dx.doi.org/10.1139/o88-031.

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The specificity of glycogen synthase (casein) kinase-1 (CK-1) for different divalent metal ions was explored in this study. Of nine metal ions (Mg2+, Mn2+, Zn2+, Cu2+, Ca2+, Ba2+, Ni2+, Co2+, Fe2+) tested, only Mg2+ supported significant kinase activity. Several of the other metals, however, inhibited the Mg2+-stimulated kinase activity. Half-maximal inhibitions by Mn2+, Zn2+, Co2+, Fe2+, and Ni2+ were observed at 55, 65, 110, 125, and 284 μM, respectively. Kinetic analyses indicate that the metal ions are acting as competitive inhibitors of CK-1 with respect to the protein substrate (casein)

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Suriya Narayanan, Ramakirushnan, and Vadapalli Chandrasekhar. "Molecular, 1D and 2D assemblies from hexakis(3-pyridyloxy)cyclophosphazene containing 20-membered metallamacrocyclic motifs." Dalton Transactions 45, no. 5 (2016): 2273–83. http://dx.doi.org/10.1039/c5dt03537f.

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Ujang, Zaini, and G. K. Anderson. "Performance of low pressure reverse osmosis membrane (LPROM) for separating mono- and divalent ions." Water Science and Technology 38, no. 4-5 (1998): 521–28. http://dx.doi.org/10.2166/wst.1998.0711.

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This paper describes an investigation on the rejection of the divalent anions from ZnSO4 using LPROMs, and to establish the effect of operating pressure, feed concentration and temperature on metal removal, then to compare with the monovalent anions, ZnCl2. A bench-scale spiral wound configuration of sulphonated polysulphone low pressure reverse osmosis membrane (LPROM) was used to remove heavy metals at various operating conditions, i.e. operating conditions, solute concentrations and temperature. The results show that the higher the operating pressure the greater will be the permeate flux fo

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Pehlivan, E., and F. Gode. "Batch Sorption of Divalent Metal Ions onto Brown Coal." Energy Sources, Part A: Recovery, Utilization, and Environmental Effects 28, no. 16 (2006): 1493–508. http://dx.doi.org/10.1080/15567030600817936.

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