Готові списки джерел за темами / Divalent metal ions release

Добірка наукової літератури з теми "Divalent metal ions release"

Автор: Grafiati
Опубліковано: 8 червня 2024

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Статті в журналах з теми "Divalent metal ions release":

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 (May 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 values of the binding constants were used to estimate the apparent thermodynamic parameters, ΔH and ΔS, for the adsorption process. FT-IR spectroscopic studies also showed that the uptake of metal cations by the silica gel occurred via a cation-exchange process.
2

Knape, Matthias J., Mike Ballez, Nicole C. Burghardt, Bastian Zimmermann, Daniela Bertinetti, Alexandr P. Kornev, and Friedrich W. Herberg. "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 Zn2+ and Mn2+ can assist in the catalytic cycle of a protein kinase by facilitating substrate binding and phosphotransfer, however, in contrast to Mg2+ they also hamper product release.
3

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 be explained on metal ion complexation-induced release of proton from the azophenol to the quinone-hydrazone tautomer followed by internal complexation of the metal ion with aid of nitrogen atoms andortho-carbonyl groups in the diazophenylazocalix[4]arenes.
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 (October 29, 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 consequent release of sodium ions from heparin. The 23Na spin relaxation rates and translational diffusion coefficients are utilized to quantify the metal ion-induced release of sodium ions from heparin. In the case of the Al3+ ion, the complementary approach of 27Al quadrupolar NMR is employed as a direct probe of ion binding to heparin. Our NMR results demonstrate at least two metal ion-binding sites with different affinities on heparin, potentially undergoing dynamic exchange. For the site with lower metal ion binding affinity, the order of Ca2+ > Mg2+ > Al3+ is obtained, in which even the weakly binding Al3+ ion is capable of displacing sodium ions from heparin. Overall, the multinuclear quadrupolar NMR approach employed here can monitor and quantify metal ion binding to heparin and capture different modes of metal ion-heparin binding.
5

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 (February 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 be interpreted in terms of two, or at most three, exponentials. The contribution of the first fast step increases with decreasing average particle size (or increasing surface area), consistent with its interpretation as being associated with the replacement of accessible protons on the exposed surface of the EMD by metal ions. The slower rate processes can be considered to be associated with adsorption in less accessible clefts or pores in the structure. In the diffusion model, the experimental data were fitted to the equation of diffusion in a sphere, fitting again requiring a first initial step followed by a slower step, with one diffusion coefficient having typically an upper limit of 10-9 and the other a lower limit of 10-11 cm2/s. For the complete reaction, the moles of protons released per mole of metal ion adsorbed were also measured and found to be relatively insensitive with respect to pH, metal ion concentration, electrolyte concentration and EMD size fraction. At pH 4, the H+: Mn+ ratio ranged from 1.4 to 2.1 (±0.1) for divalent transition metal ions, consistent with dominant chelation of the divalent metal ion to two adjacent oxygen sites on the surface; for thallium(I), a low ratio (0.5) indicated a different mode of surface attachment.
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 (July 1, 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 were bound in high and medium molecular weight fractions. Cd+2 and Zn+2 were rapidly released from their bound forms in the absence of a protease inhibitor, and their presence was confirmed by polarography with EDTA. Gel-permeation chromatography coupled with atomic absorption spectrophotometry offers a rapid method for following changes in the concentrations of bound and free metal ions during processing of shellfishbased foodstuffs.
8

Facchin, F., S. Catalani, E. Bianconi, D. De Pasquale, S. Stea, A. Toni, S. Canaider, and A. Beraudi. "Albumin as marker for susceptibility to metal ions in metal-on-metal hip prosthesis patients." Human & Experimental Toxicology 36, no. 4 (May 20, 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 measured in whole blood, serum and urine of 40 MoM patients. A mutational screening of ALB was performed to detect links between mutations and metal binding. Finally, serum concentration of total ALB and IMA were measured. Serum total ALB concentration was in the normal range for all patients. None of the subjects presented mutations in the investigated gene. Whole blood, serum and urine Co did not correlate with serum total ALB or IMA, although IMA was above the normal limit in most subjects. The individual susceptibility is very important for patients’ health status. Despite the limited results of this study, we provide indications on possible future investigations on the toxicological response to Co.
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, Lu Chen, Kevin Hwang, Nan Zheng, Jianjun Cheng, and Yi Lu. "In vitro selection of a sodium-specific DNAzyme and its application in intracellular sensing." Proceedings of the National Academy of Sciences 112, no. 19 (April 27, 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 transformation of this DNAzyme into a fluorescent sensor for Na+by labeling the enzyme strand with a quencher at the 3′ end, and the DNA substrate strand with a fluorophore and a quencher at the 5′ and 3′ ends, respectively. The presence of Na+catalyzed cleavage of the substrate strand at an internal ribonucleotide adenosine (rA) site, resulting in release of the fluorophore from its quenchers and thus a significant increase in fluorescence signal. The sensor displays a remarkable selectivity (>10,000-fold) for Na+over competing metal ions and has a detection limit of 135 µM (3.1 ppm). Furthermore, we demonstrate that this DNAzyme-based sensor can readily enter cells with the aid of α-helical cationic polypeptides. Finally, by protecting the cleavage site of the Na+-specific DNAzyme with a photolabileo-nitrobenzyl group, we achieved controlled activation of the sensor after DNAzyme delivery into cells. Together, these results demonstrate that such a DNAzyme-based sensor provides a promising platform for detection and quantification of Na+in living cells.
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Статті в журналах Дисертації

Дисертації з теми "Divalent metal ions release":

1

Awassa, Jazia. "Mécanismes antibactériens des hydroxydes doubles lamellaires à base de zinc." Electronic Thesis or Diss., Université de Lorraine, 2022. http://www.theses.fr/2022LORR0155.

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Les hydroxydes doubles lamellaires (HDL) sont des composés solides constitués par un ensemble de feuilles d'hydroxydes métalliques divalents M(II) et trivalents M(III) entre lesquels s’insèrent des anions et des molécules d’eau. En raison de la flexibilité des HDL en termes de propriétés physico-chimiques, l’étude des différents mécanismes antibactériens qui leurs sont associés présente un intérêt croissant. Ce travail de thèse vise à étudier différentes hypothèses proposées pour explique l'effet antibactérien des hydroxydes doubles lamellaire (HDL) à base de zinc : (1) interactions directes entre la surface des HDL et les parois bactériennes, (2) libération d'ions métalliques divalents en solution depuis les feuillets des HDL, (3) génération d'espèces réactives de l'oxygène (ROS). Lors d’une première étude, une investigation globale a été réalisée pour déterminer les différents paramètres physico-chimiques influençant l'activité antibactérienne des HDLs M(II)Al(III) (M= Zn, Cu, Ni, Co, Mg). L'effet antimicrobien des HDLs contre les bactéries Gram-positives Staphylococcus aureus et Gram-négatives Escherichia coli a été corrélé en premier lieu à la nature du métal divalent, et en second lieu à la quantité d'ions M2+aq libérés dans le milieu de culture. Cet effet était plus prononcé pour les HDLs à base de Zn(II) possédant la plus forte activité antibactérienne et dont les propriétés antibactériennes dépendent du profil de libération des ions Zn2+aq (Mécanisme 2) contrôlée initialement par les différents paramètres physico-chimiques étudiés. De plus, rôle du contact direct (Mécanisme 2) a été validé pour les HDLs à base de Zn(II) en comparant l'activité antibactérienne d’HDLs de taille micrométrique contre S. aureus à celle des nanoparticules (NPs) d’HDL présentant un effet antibactérien supérieur. La présence d'interactions spécifiques entre les HDLs à base de Zn(II) et la paroi de S. aureus a été validée par microscopie à force atomique en mode spectroscopie de force (AFM-FS). L'amélioration des propriétés antibactériennes des NPs d’HDL à base de Zn(II) par la génération de ROS (Mécanisme 3) en présence de lumière UVA a également été évaluée. Après avoir fourni des preuves expérimentales sur les trois mécanismes suggérés, la contribution de chaque mécanisme dans l'activité antibactérienne des HDLs à base de Zn(II) a été déterminé
Layered double hydroxides (LDH) are solid compounds constituted by the stacking of divalent M(II) and trivalent M(III) metal hydroxide sheets separated by an interlayer of anions and water molecules. Due to the versatility of LDH in terms of their tunable physico-chemical properties, a growing interest arises for investigating their different antibacterial activity mechanisms. This thesis work aims at studying the different proposed hypotheses explaining the antibacterial effect of pristine zinc-based LDHs: (1) direct interactions between the surface of LDH and bacterial cell walls, (2) release of constituent divalent metal ions, (3) generation of reactive oxygen species (ROS). First a global investigation was performed to determine the different physico-chemical parameters influencing the antibacterial activity of pristine M(II)Al(III) LDHs (M= Zn, Cu, Ni, Co, Mg). The antimicrobial effect of LDHs against Gram-positive Staphylococcus aureus and Gram-negative Escherichia coli bacteria was linked in the first place to the nature of divalent metal itself, and to the amount of released M2+aq ions into the culture media in the second place. This effect was more easily identified in Zn(II)-based LDHs possessing the strongest antibacterial activity and whose antibacterial properties depended on their release profile of Zn2+aq ions (Mechanism 2) initially controlled by the different physico-chemical parameters. Moreover, the direct contact mechanism (Mechanism 1) was validated for Zn(II)-based LDHs by comparing the antibacterial activity of micron-sized LDHs against S. aureus to that of LDH nanoparticles (NPs) exhibiting a greater antibacterial effect. The presence of specific surface interactions between Zn(II)-based LDHs and the cell wall of S. aureus was further validated by atomic force microscopy-based force spectroscopy (AFM-FS). The enhancement of the antibacterial properties of Zn(II)-based LDH NPs by ROS generation (Mechanism 3) in presence of UVA light was also assessed. After providing experimental evidences about the three suggested mechanisms, the role of each mechanism contributing to the antibacterial activity of Zn(II)-based LDHs in different antibacterial tests assays was determined
2

Wang, Yu-Wen. "Substitution of Calcium with Divalent Metal Ions in Paraoxonase I." The Ohio State University, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=osu1420819949.

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3

Afolaranmi, Grace Ayodele. "Disposition of metal ions in patients after release from orthopaedic arthroplasties." Thesis, University of Strathclyde, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.501856.

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4

Bellomo, Elisa. "Divalent metal ions and the pancreatic B-cell : role in the pathogenesis of type 2 diabetes." Thesis, Imperial College London, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.526394.

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5

Ferko, Maxime-Alexandre. "Molecular Mechanisms Involved in Interleukin-1β Release by Macrophages Exposed to Metal Ions from Implantable Biomaterials". Thesis, Université d'Ottawa / University of Ottawa, 2018. http://hdl.handle.net/10393/37331.

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Metal ions released from implantable biomaterials have been associated with adverse biological reactions that can limit implant longevity. Previous studies have shown that, in macrophages, Co2+, Cr3+, and Ni2+ can activate the NLR family pyrin domain-containing protein 3 (NLPR3) inflammasome, which is responsible for interleukin(IL)-1β production through caspase-1. Furthermore, these ions are known to induce oxidative stress, and inflammasome priming is known to involve nuclear factor kappa-light-chain-enhancer of activated B cells (NF-κB) signaling. However, the mechanisms of inflammasome activation by metal ions remain largely unknown. The objectives of this thesis were to determine if, in macrophages: 1. IL-1β release induced by metal ions is caspase-1-dependent; 2. caspase-1 activation and IL-1β release induced by metal ions are oxidative stress-dependent; and 3. IL-1β release induced by metal ions is NF-κB signaling pathway-dependent. Lipopolysaccharide (LPS)-primed murine bone-marrow-derived macrophages were exposed to Co2+, Cr3+, or Ni2+, with or without an inhibitor of caspase-1, oxidative stress, or NF-κB. Culture supernatants were analyzed for active caspase-1 (immunoblotting) and/or IL-1β (ELISA). Overall, results showed that while both Cr3+ and Ni2+ may be inducing inflammasome activation, Cr3+ is likely a more potent activator, acting through oxidative stress and the NF-κB signaling pathway. Further elucidation of the activation mechanisms may facilitate the development of therapeutic approaches to modulate the inflammatory response to metal ions, and thereby increase implant longevity.
6

Liu, Chang. "Metal ions removal from polluted waters by sorption onto exhausted coffee waste. Application to metal finishing industries wastewater treatment." Doctoral thesis, Universitat de Girona, 2014. http://hdl.handle.net/10803/283705.

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A new technology for Cr(VI) and divalent metal ions removal based on metal sorption onto exhausted coffee waste has been developed. Physical and chemical characterization of exhausted coffee waste was explored as well as the role of structural and non structural compounds of the waste in metal ions sorption. Kinetics of Cr(VI) sorption from binary mixtures containing different Cr(VI) and Cu(II) molar ratios were carried out in a batch reactor. A synergistic effect of Cu(II) in Cr(VI) reduction and sorption was found. From the kinetic sets of data a kinetic model taking into account Cr(VI) reduction/sorption, reduced Cr(III) sorption and Cu(II)synergistic effect on sorption was developed. The model described quite accurately the overall process of Cr(VI) removal. Biosorption by coffee wastes followed by precipitation resulted to be an efficient and low cost technology to remove Cr(VI) and divalent metals from synthetic and industrial effluents from metal finishing industries
S'ha desenvolupat una tecnologia nova per a l'eliminació de Cr(VI) i metalls divalents basada en l'adsorció dels metalls en residus de marro de café. Es va dur a terme la caracterització físicoquímica del marro de café i es va investigar el paper dels components estructurals i no estructurals en l'adsorció de metalls. Emprant un tanc agitat es va estudiar la cinètica d'adsorció de Cr(VI) de mescles binàries de Cr(VI)-Cu(II) amb diferents relacions molars d'ambdos metalls. Es va trobar un efecte sinèrgic del coure sobre l'adsorció i la reducció de Cr(VI). Un model basat en la reducció/adsorció de Cr(VI), adsorció del Cr(III) format i l'efecte sinèrgic del coure va ser desenvolupat. El model va descriure adequadament el procés. La bioadsorció seguida de precipitació va resultar ser una tecnologia eficaç i de baix cost per eliminar Cr(VI) i metalls divalents d'aigües sintètiques i efluents d’indústries de tractament de superfícies
7

Brännvall, Mathias. "Metal ion cooperativity in Escherichia coli RNase P RNA." Doctoral thesis, Uppsala universitet, Institutionen för cell- och molekylärbiologi, 2002. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-2056.

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RNase P is an essential ribonuclease responsible for removal of the 5’ leader of tRNA precursors. Bacterial RNase P consists of an RNA subunit and a small basic protein. The catalytic activity is associated with the RNA subunit, i.e. bacterial RNase P RNA is a ribozyme. The protein subunit is, however, essential for activity in vivo. RNase P RNA, as well as the holoenzyme, requires the presence of divalent metal ions for activity. The aim of this thesis was to increase our understanding of the catalytic mechanism of RNase P RNA mediated cleavage. The importance of the nucleotides close to the cleavage site and the roles of divalent metal ions in RNase P RNA-catalyzed reaction were investigated. Escherichia coli RNase P RNA (M1 RNA) was used as a model system. It was shown that different metal ions have differential effects on cleavage site recognition. Cleavage activity was rescued by mixing metal ions that do not promote cleavage activity by themselves. This suggests that efficient and correct cleavage is the result of metal ion cooperativity in the RNase P RNA-mediated cleavage reaction. The results suggested that one of the metal ions involved in this cooperativity is positioned in the vicinity of a well-known interaction between RNase P RNA and its substrate. Based on my studies on how different metal ions bind to RNA and influence its activity we raise the interesting possibility that the activity of biocatalysts that depend on RNA for activity are up- or downregulated depending on the intracellular concentrations of the bulk biological metal ions Mg2+ and Ca2+. The nucleotides upstream of the cleavage site in the substrate were found to influence the cleavage efficiency. This was not exclusively due to intermolecular base pairing within the substrate but also dependent on the identities of the nucleotides at position –2 and –1. The strength of the base pair at position –1/+73 was demonstrated to affect cleavage efficiency. These observations are in keeping with previous suggestion that the nucleotides close to the cleavage site are important for RNase P cleavage. We conclude that the residue at -1 is a positive determinant for cleavage by RNase P. Hence, my studies extend our understanding of the RNase P cleavage site recognition process.
8

Xiao, Lan. "Etude physico-chimique de la complexation de divers ions metalliques (cu**(2+), ni**(2+) et co**(2+)) avec des dipeptides l-l contenant des chaines laterales non-coordinantes." Paris 7, 1988. http://www.theses.fr/1988PA077170.

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Stabilite des complexes en fonction de l'interaction des chaines laterales du dipeptide et le solvant. Mesures potentiometriques calorimetriques, caracterisation spectrometrique et structure moleculaire
9

Sahmoune, Amar. "Extractions synergiques de metaux divalents de transition par association d'une acyl-4-pyrazolone-5 avec des polyethers cycliques et acycliques." Université Louis Pasteur (Strasbourg) (1971-2008), 1988. http://www.theses.fr/1988STR13116.

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Extractions de co. Zu. Cd et cu divalents par les melanges phenyl-1 methyl-3 benzoyl-4 pyrazolone-5 ethers crown. La coextraction alcalins-alcalinoterreux complexes par les composes crown et des metaux divalents est possible quand la taille de la cavite de l'ether-crown est voisine de celle de l'alcalin (ou alcalino-terreux) et quand l'ion ml::(3)**(-) est suffisamment stable
10

Dearden, David Vernell Beauchamp Jesse L. Beauchamp Jesse L. "Experimental probes of gas phase ions and molecules : I. Product kinetic energy release measurements as a probe of reaction thermochemistry, dynamics, and chemical structure in systems containing transition metal ions. II. Photoelectron and optical studies of organic transient species /." Diss., Pasadena, Calif. : California Institute of Technology, 1989. http://resolver.caltech.edu/CaltechETD:etd-02082007-130036.

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Частини книг з теми "Divalent metal ions release":

1

Rani, Pooja. "Fluorescence Characteristics of Coumarin Derivatives with Divalent Metal Ions." In Computational and Experimental Methods in Mechanical Engineering, 251–57. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-2857-3_26.

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2

Gwizdala, Celina, and Shawn C. Burdette. "Photo-release of Metal Ions in Living Cells." In Inorganic Chemical Biology, 275–308. Chichester, UK: John Wiley & Sons, Ltd, 2014. http://dx.doi.org/10.1002/9781118682975.ch9.

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3

Huang, Charles Y., Marina Lanciotti, and Aile Zhang. "Mechanism of Activation of Calmodulin-Dependent Phosphatase by Divalent Metal Ions." In Enzyme Dynamics and Regulation, 40–47. New York, NY: Springer New York, 1988. http://dx.doi.org/10.1007/978-1-4612-3744-0_5.

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4

Kornilova, Svetlana, Valery Andrushchenko, and Yurij Blagoi. "Spectroscopic studies of divalent metal ions effect on DNA and polynucleotides structural transitions." In Spectroscopy of Biological Molecules: New Directions, 237–38. Dordrecht: Springer Netherlands, 1999. http://dx.doi.org/10.1007/978-94-011-4479-7_102.

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5

Sorokin, Victor A., Vladimir A. Valeev, Marina V. Degtyar, Galina O. Gladchenko, and Yuri P. Blagoi. "Effects of divalent metal ions on secondary and tertiary structures of polyriboinosinic acid." In Spectroscopy of Biological Molecules: New Directions, 253–54. Dordrecht: Springer Netherlands, 1999. http://dx.doi.org/10.1007/978-94-011-4479-7_110.

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6

Tabak, Marcel, Maria H. Tinto, Hidetake Imasato, and Janice R. Perussi. "Interaction of Divalent Metal Ions with the Hemoglobin of Glossoscolex paulistus: an EPR Study." In Structure and Function of Invertebrate Oxygen Carriers, 121–25. New York, NY: Springer New York, 1991. http://dx.doi.org/10.1007/978-1-4612-3174-5_16.

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7

Loder, Merewyn K., Takashi Tsuboi, and Guy A. Rutter. "Live-Cell Imaging of Vesicle Trafficking and Divalent Metal Ions by Total Internal Reflection Fluorescence (TIRF) Microscopy." In Nanoimaging, 13–26. Totowa, NJ: Humana Press, 2012. http://dx.doi.org/10.1007/978-1-62703-137-0_2.

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8

Behrendt, H., M. Wieczorek, S. Wellner, and A. Winzer. "Effect of Some Metal Ions (Cd++, Pb++, Mn++) on Mediator Release from Mast Cells in Vivo and in Vitro." In Environmental Hygiene, 105–10. Berlin, Heidelberg: Springer Berlin Heidelberg, 1988. http://dx.doi.org/10.1007/978-3-642-73766-4_23.

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9

Stephan, Udo W., Ilka Schmidke, and Axel Pich. "Phloem translocation of Fe, Cu, Mn, and Zn in Ricinus seedlings in relation to the concentrations of nicotianamine, an endogenous chelator of divalent metal ions, in different seedling parts." In Iron Nutrition in Soils and Plants, 43–50. Dordrecht: Springer Netherlands, 1995. http://dx.doi.org/10.1007/978-94-011-0503-3_7.

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10

Glover, Robert. "Corrosion Processes of Steel-Hulled Potentially Polluting Wrecks." In Threats to Our Ocean Heritage: Potentially Polluting Wrecks, 41–59. Cham: Springer Nature Switzerland, 2024. http://dx.doi.org/10.1007/978-3-031-57960-8_4.

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AbstractSubmerged metals are continuously affected by the chemical processes of corrosion, the destructive degradation of metal by chemical or electrochemical reactions within the marine environment (Valenca et al., 2022:2–3; Venugopal, 1994:35). Over time, metal ions at anodic sites defuse into electrolytic solutions from the oxidising reactions occurring at cathodic sites, causing the creation of corrosion byproducts, like rust on iron, and the loss of structural mass. The different reduction reactions in the microstructures of alloys and the imperfections found within refined materials, like carbon slag in steel, are targeted by this process, essentially reverting the chemically unstable materials back to their more stable original forms (Moore III, 2015:192; MacLeod 2016:90–92). The deterioration of metallic shipwreck hulls has become a growing concern within the field of marine conservation as many of the fuel tankers deliberately targeted in WWII threaten to release trapped fuel and chemical cargoes after nearly eight decades of exposure to a range of corrosive environments (Barrett, 2011:4–5). With the deterioration rate of ship hulls averaging at around ±0.1–0.4 mm of loss per year and the thickness of ship deck plates from the 1940s to the 1960s ranging generally from 1–4 cm in thickness, the window to act on the majority of potentially polluting shipwrecks (PPW) before a catastrophic breach occurs is closing (MacLeod, 2016a:8; Beldowski, 2018:249; Masetti, 2012:33; Masetti & Calder, 2014:139).

Тези доповідей конференцій з теми "Divalent metal ions release":

1

Laivins, G. V., and A. M. Scallan. "The Exchange and Removal of the Metal Cations in Pulps." In The Fundamentals of Papermaking Materials, edited by C. F. Baker. Fundamental Research Committee (FRC), Manchester, 1997. http://dx.doi.org/10.15376/frc.1997.2.837.

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Metal cations modify the optical and mechanical properties of pulps and in pulp mills can have adverse effects on such parameters as corrosion rate and recovery furnace temperature. With today’s emphasis on recycling effluents and on tighter control of all operations, there is a need for quantitative theory predicting the uptake of cations by pulps and the buildup of cations in process liquors. A variation of the Donnan Equilibrium Theory was recently developed to describe the partitioning of cations between the fibres and the liquor in a pulp suspension [1]. In this report we extend use of the theory to examine the ion-exchange of pulps from saturation with one cation to saturation with another. Theoretical predictions are closely duplicated by experiments using sodium, magnesium and lanthanum as model cations of different valencies. Pulps readily exchange cations even with very dilute solutions, preferentially taking up and most tenaciously holding the higher valency cations. Consequently, the replacement of high valency cations by monovalent cations requires higher concentrations of the replacement ion than for the reverse exchange. The differing tenacities by which cations are held are also shown during acid washing of pulps. Upon progressively lowering the pH of a suspension of pulp in mixed ionic form, monovalent, divalent and trivalent cations are successively released and replaced by hydrogen ions. The implication of these results for the “acid washing” of pulps is discussed.
2

Fedotova, E. V., S. V. Paston, and A. D. Goroh. "INTERACTION OF HUMAN SERUM ALBUMIN WITH DIVALENT METAL IONS." In X Международная конференция молодых ученых: биоинформатиков, биотехнологов, биофизиков, вирусологов и молекулярных биологов — 2023. Novosibirsk State University, 2023. http://dx.doi.org/10.25205/978-5-4437-1526-1-156.

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In this work, the structure of human serum albumin in aqueous solution was studied upon interaction with Mg2+, Mn2+, Co2+ and Cu2+ ions. The transition metal ions provoke an increase in the content of β-layers and a decrease in the quantity of α-helices in the protein structure. In the presence of Cu2+, aggregation and a change in the sign of the surface charge of protein particles are observed.
3

Mizoguchi, Kenji. "Electronic states of M-DNA incorporated with divalent metal ions." In SPIE NanoScience + Engineering, edited by Norihisa Kobayashi, Fahima Ouchen, and Ileana Rau. SPIE, 2010. http://dx.doi.org/10.1117/12.862398.

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4

Samborsky, A. V., and E. A. Radzhabov. "Dielectric spectra of divalent rare-earth metal ions in LaF3 crystals." In Luminescence and Laser Physics: XVII International Conference on Luminescence and Laser Physics – LLPh 2019. AIP Publishing, 2021. http://dx.doi.org/10.1063/5.0062750.

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5

Maloverjan, Maria, Abhijit Biswas, Kärt Padari, Aare Abroi, Ana Rebane, and Margus Pooga. "Divalent Metal Ions Boost Effect of Nucleic Acids Delivered by Cell- Penetrating Peptides." In 36th European Peptide Symposium. The European Peptide Society, 2022. http://dx.doi.org/10.17952/36eps.2022.117.

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6

Abdullah, M. Z., and K. P. Loo. "Separation of divalent metal ions using Pandanus Amaryllifolius Roxb (Pandanus) leaves: desorption study." In WASTE MANAGEMENT 2006. Southampton, UK: WIT Press, 2006. http://dx.doi.org/10.2495/wm060341.

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7

Maloverjan, Maria, Abhijit Biswas, Kärt Padari, Aare Abroi, Ana Rebane, and Margus Pooga. "Divalent Metal Ions Boost Effect of Nucleic Acids Delivered by Cell- Penetrating Peptides." In 36th European Peptide Symposium. The European Peptide Society, 2022. http://dx.doi.org/10.17952/36eps/36eps.2022.117.

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8

Kapnisis, Konstantinos, Polyvios Eleftheriou, George Lapathitis, Christos Karaiskos, Preston Beck, Jack Lemons, David Connolly, Costas Pitsillides, and Andreas Anayiotos. "Surface Modified Nitinol Stents Release Metal Ions in Blood." In ASME 2013 Summer Bioengineering Conference. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/sbc2013-14244.

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Intravascular nitinol stents are used in the treatment of atherosclerosis and intracranial aneurysms. Despite the unique physical properties of shape memory and superelasticity, the chemical composition of NiTi has raised concerns due to the presence of nickel ions within the alloy which can have adverse effects on human health. Currently, stents are manufactured from corrosion resistant alloys which form protective titanium oxide films, insulating the bulk material from the corrosive physiologic fluid. However, nanometer thick regions of oxides are lost at locations of high strain due to significant bending, micromotion between overlapping stents or local calcification1‐2. Recent studies have revealed that some stents undergo corrosion in vivo, with significant release of metallic ions into surrounding tissues3–4. In this project, a range of techniques has been employed to modify the surface of miniature NiTi stents in order to mimic in vivo corrosion and correlate the amount of nickel ions released with the findings in explanted tissue.
9

D’Souza, Delma, N. Jagannatha, K. P. Nagaraja, P. S. Rohith, and K. V. Pradeepkumar. "Growth and characterization of divalent transition metal ions doped zinc hydrogen phosphate single crystals." In 2ND INTERNATIONAL CONFERENCE ON CONDENSED MATTER AND APPLIED PHYSICS (ICC 2017). Author(s), 2018. http://dx.doi.org/10.1063/1.5032801.

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10

Zhang, Jiahua, Xiangjun Wang, Shihua Huang, and Jiaqi Yu. "Inhomogeneous Broadening and Persistent Spectral Hole-Burning of Divalent Samarium Ions In Alkaline Earth Metal Halides." In Persistent Spectral Hole Burning: Science and Applications. Washington, D.C.: Optica Publishing Group, 1991. http://dx.doi.org/10.1364/pshb.1991.fa3.

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Persistent spectral hole burning (PSHB) was discovered in organic molecular system in 1974[1]. Five years later, PSHB in inorganic materials was discovered in NaF by R. M. Macfarlane et al [2]. In 1985, A. Winnacker et al [3] first observed photon gated spectral hole burning in BaFCl: Sm2+ at 2K. Hole burning(HB) is useful in high resolution spectroscopy. It is also of crucial importance for the application to frequency domain optical storage. The storage density is proportional to the ratio of inhomogeneous linewidth(Γi) to the homogeneous linewidth(Γh), N(= Γi/Γh). The inhomogeneous linewidth of 5D0-TF0 transition of Sm2+ is 16GHz and the hole width is 25MHz in BaFCl at 2K[3]. For this material, the inhomogeneous linewidth changes only moderately with the temperature; On the other hand, the homogeneous linewidth increases rapidly as the temperature rises. Then, a small value of N(~2) can be estimated when HB temperature is raised to 77K. That means, it is difficult to burn a hloe in the inhomogeneous line in BaFCl:Sm2+ at 77K. To maintain a reasonable storage capacity or to study HB at a quite high temperature, a large inhomogeneous linewidth is in great request.

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