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Journal articles on the topic 'Sr2+ cations'

Author: Grafiati

Published: 3 June 2025

Last updated: 31 July 2025

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1

Strobel, Sabine, and Thomas Schleid. "Quaternäre Strontium-Kupfer(I)-Lanthanoid(III)-Selenide mit Cer und Praseodym: SrCuCeSe3 und SrCuPrSe3, ein ungleiches Geschwisterpaar / Quaternary Strontium Copper(I) Lanthanoid(III) Selenides with Cerium and Praseodymium: SrCuCeSe3 and SrCuPrSe3, Unequal Brother and Sister." Zeitschrift für Naturforschung B 59, no. 9 (2004): 985–91. http://dx.doi.org/10.1515/znb-2004-0907.

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Quaternary strontium copper(I) lanthanoid(III) selenides are formed by the oxidation of elemental strontium, copper and the corresponding lanthanoid with selenium. Orange to red needle-shaped single crystals of SrCuPrSe3 and SrCuCeSe3 have been synthesized by heating mixtures of Sr, Cu, Pr / Ce and Se with CsI as a flux in evacuated silica tubes to 800°C for 7 d. Both compounds crystallize orthorhombically in space group Pnma with four formula units per unit cell, but with unlike lattice constants (a = 1097.32(6), b = 416.51(2), c = 1349.64(8) pm for SrCuPrSe3 and a = 846.13(5), b = 421.69(2),

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2

Kopecký, Miloš, Jan Fábry, and Jiří Kub. "Modelling of cation displacements in SrTiO3by means of multi-energy anomalous X-ray diffuse scattering." Journal of Applied Crystallography 49, no. 3 (2016): 1016–20. http://dx.doi.org/10.1107/s1600576716007147.

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X-ray diffuse scattering of SrTiO3has been measured at two photon energies, the first just below the absorption edge and the second far from theKabsorption edge of strontium, in order to vary the atomic scattering factor of the strontium cations. It is shown that two different models of cation displacement comply with the single-energy diffuse scattering patterns, because single-energy diffuse scattering provides only ambiguous information on the directions of displacement of the Sr2+and Ti4+cations. However, the application of multi-energy anomalous diffuse scattering determines unambiguously

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3

Junio, Jonathan B., Prae Chirawatkul, Marlon T. Conato, and Candy C. Mercado. "Substitution of Ca2+ in Calcite by Sn2+ and Sr2+ cations through ion exchange characterized by X-ray absorption and photoelectron spectroscopies." MRS Advances 6, no. 12 (2021): 342–49. http://dx.doi.org/10.1557/s43580-021-00061-w.

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AbstractTin (Sn2+) and strontium (Sr2+), two potential alternatives to lead (Pb2+) in perovskite formation, were explored in transforming calcium carbonate (CaCO3) into a leaving group in a cation exchange reaction. This is the first part of a sequential ion exchange process in transforming calcite into a Pb-free perovskite material for perovskite solar cell applications. Calcite, a polymorph of CaCO3, was successfully transformed into strontianite (SrCO3) through a cation exchange reaction. In the Sn substitution reaction on the other hand, no SnCO3 formation was noted. Instead, oxides of Sn

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4

Müller, T. H., D. Swandulla, and H. D. Lux. "Activation of three types of membrane currents by various divalent cations in identified molluscan pacemaker neurons." Journal of General Physiology 94, no. 6 (1989): 997–1014. http://dx.doi.org/10.1085/jgp.94.6.997.

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We investigated membrane currents activated by intracellular divalent cations in two types of molluscan pacemaker neurons. A fast and quantitative pressure injection technique was used to apply Ca2+ and other divalent cations. Ca2+ was most effective in activating a nonspecific cation current and two types of K+ currents found in these cells. One type of outward current was quickly activated following injections with increasing effectiveness for divalent cations of ionic radii that were closer to the radius of Ca2+ (Ca2+ greater than Cd2+ greater than Hg2+ greater than Mn2+ greater than Zn2+ g

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Oberhauser, A., O. Alvarez, and R. Latorre. "Activation by divalent cations of a Ca2+-activated K+ channel from skeletal muscle membrane." Journal of General Physiology 92, no. 1 (1988): 67–86. http://dx.doi.org/10.1085/jgp.92.1.67.

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Several divalent cations were studied as agonists of a Ca2+-activated K+ channel obtained from rat muscle membranes and incorporated into planar lipid bilayers. The effect of these agonists on single-channel currents was tested in the absence and in the presence of Ca2+. Among the divalent cations that activate the channel, Ca2+ is the most effective, followed by Cd2+, Sr2+, Mn2+, Fe2+, and Co2+. Mg2+, Ni2+, Ba2+, Cu2+, Zn2+, Hg2+, and Sn2+ are ineffective. The voltage dependence of channel activation is the same for all the divalent cations. The time-averaged probability of the open state is

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Kuriyama, Hiroshi, Itaru Umeda, and Harumi Kobayashi. "Role of cations in the flocculation of Saccharomyces cerevisiae and discrimination of the corresponding proteins." Canadian Journal of Microbiology 37, no. 5 (1991): 397–403. http://dx.doi.org/10.1139/m91-064.

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Asexual yeast flocculation was studied using strong flocculents of Saccharomyces cerevisiae. The inhibitory effect of cations on flocculation is considered to be caused by competition between those cations and Ca2+ at the binding site of the Ca2+-requiring protein that is involved in flocculation. Inhibition of flocculation by various cations occurred in the following order: La3+, Sr2+, Ba2+, Mn2+, Al3+, and Na+. Cations such as Mg2+, Co2+, and K+ promoted flocculation. This promoting effect may be based on the reduction of electrostatic repulsive force between cells caused by binding of these

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7

Milenkovic, Aleksandra, Ivana Smiciklas, Jelena Markovic, and Nikola Vukelic. "Immobilization of 60Co and 90Sr ions using red mud from aluminum industry." Nuclear Technology and Radiation Protection 29, no. 1 (2014): 79–87. http://dx.doi.org/10.2298/ntrp1401079m.

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The removal of 60Co and 90Sr from the aqueous phase was tested using red mud - the fine grained residue from bauxite ore processing. This industrial waste represents a mixture of numerous minerals, mainly oxides and hydroxides of Fe, Al, Si, and Ti. Experiments were conducted as a function of contact time, pH, and pollutant concentrations. Kinetic data were well fitted with a pseudo-second order equation. The calculated rate constants and initial sorption rates indicated faster sorption of Sr2+ ions. Removal of both cations rapidly increased with the initial pH increase from 2.5 to 3.5. With t

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8

Bazin, D., M. Daudon, Ch Chappard, J. J. Rehr, D. Thiaudière, and S. Reguer. "The status of strontium in biological apatites: an XANES investigation." Journal of Synchrotron Radiation 18, no. 6 (2011): 912–18. http://dx.doi.org/10.1107/s0909049511032651.

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Osteoporosis represents a major public health problem and increases patient morbidity through its association with fragility fractures. Among the different treatments proposed, strontium-based drugs have been shown to increase bone mass in postmenopausal osteoporosis patients and to reduce fracture risk. While the localization of Sr2+cations in the bone matrix has been extensively studied, little is known regarding the status of Sr2+cations in natural biological apatite. In this investigation the local environment of Sr2+cations has been investigated through XANES (X-ray absorption near-edge s

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9

Krysenko, D. A., Yu A. Таrasevich, and V. Ya Demchenko. "Thermodynamics of the ion exchange of Ca2+ and Sr2+ cations on Na-form of natural clinoptilolite." Himia, Fizika ta Tehnologia Poverhni 14, no. 3 (2023): 358–71. http://dx.doi.org/10.15407/hftp14.03.358.

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The adsorption and direct calorimetric studies of the binary exchange of Ca2+ and Sr2+ cations on the Na-form of low-silica type natural clinoptilolite (Sokyrnytsya, Ukraine) were performed. The ion exchange of Ca2+ and Sr2+ cations on the Na-form of natural clinoptilolite was studied under static conditions at a solid to liquid phase ratio of 1 : 100 and a constant ionic strength of the solution of 0.1. The integral heats of ion exchange for these systems were measured using a highly sensitive Tian-Calve microcalorimeter in a special lab-made cell. Also, the ion exchange isotherms and Kiellan

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10

Meyer-Fernandes, José Roberto, Mauro Sola-Penna, and Adalberto Vieyra. "A Comparison Between Calcium and Strontium Transport by the (Ca2+ + Mg2+)ATPase of the Basolateral Plasma Membrane of Renal Proximal Convoluted Tubules." Membranes 15, no. 4 (2025): 122. https://doi.org/10.3390/membranes15040122.

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In this work, the utilization of calcium and strontium by the (Ca2+ + Mg2+)ATPase of the basolateral plasma membrane of renal proximal convoluted tubules were compared. [90Sr]Sr2+ and [45Ca]Ca2+ uptake by vesicles derived from this membrane were strictly dependent on ATP and Mg2+, and no other nucleotide was able to support the transport. Each cation inhibited the uptake of the other one in a purely competitive fashion (the same Vmax; increased K0.5), without causing a significant change in the influx rate. These results indicate that both cations bind at the same transport site on the enzyme,

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J. MORGAN, Anthony, and Ron JACOB. "Ca2+ influx does more than provide releasable Ca2+ to maintain repetitive spiking in human umbilical vein endothelial cells." Biochemical Journal 320, no. 2 (1996): 505–17. http://dx.doi.org/10.1042/bj3200505.

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We investigated why oscillations of intracellular Ca2+ concentrations ([Ca2+]i) in endothelial cells challenged by submaximal histamine run down in Ca2+-free medium despite stores retaining most of their Ca2+. One explanation is that only a small subpopulation of the Ca2+ stores oscillate and are completely emptied of Ca2+. To investigate if influx refills an empty store subpopulation, we differentiated between cations entering the cell and those released from internal stores by using extracellular Sr2+ as a Ca2+ surrogate; we distinguished between [Sr2+]i and [Ca2+]i by using the larger effec

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12

Ossowski, Tadeusz, Hanna Sulowska, Tomasz Karbowiak, Dorota Zarzeczanska, Błażej Gierczyk, and Grzegorz Schroeder. "1H NMR and spectrophotometric study of alkaline metal ion complexes with N-dansyl aza-18-crown-6." Open Chemistry 4, no. 1 (2006): 13–28. http://dx.doi.org/10.1007/s11532-005-0002-0.

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AbstractFormation of complexes of A18C6-Dns and metal cations (Ca2+, Sr2+, Ba2+ and Mg2+) in acetonitrile has been studied by NMR, absorption and fluorescence spectroscopy and PM5 semi-empirical methods. A18C6-Dns forms stable complexes with Ca2+, Sr2+ and Ba2+ cations. The stability constants of various complexes are determined by different methods and their structures are visualised by the PM5 semi-empirical calculations.

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13

Mamedova, G. A. "THE ION-EXCHANGE PROPERTIES OF NATURAL ZEOLITE MORDENITE." Fine Chemical Technologies 11, no. 1 (2016): 29–33. http://dx.doi.org/10.32362/2410-6593-2016-11-1-29-33.

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The cation exchange properties of mordenite (a Nakhchivan natural zeolite) were studied. Ion exchange of the original cations - sodium, potassium and calcium - by magnesium, strontium, cadmium, zinc and nickel cations was carried out. It was found that in the case of Zn cations cation exchange occurs readily at a high speed and the maximum value of the degree of exchange. A low value of the degree of cation exchange is observed for Mg. This is due to the large hydration shell of magnesium, which adversely affects the cation exchange. High values of the exchange rate of Na+ cations have already

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14

Ruseikina, Anna V., Maxim V. Grigoriev, Maxim S. Molokeev, et al. "Synthesis, Crystal Structure and Properties of the New Laminar Quaternary Tellurides SrLnCuTe3 (Ln = Sm, Gd–Tm and Lu)." Crystals 13, no. 2 (2023): 291. http://dx.doi.org/10.3390/cryst13020291.

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This paper reports for the first time on the new laminar quaternary orthorhombic heterometallic quaternary tellurides SrLnCuTe3, the fabrication of which has been a challenge until this work. Data on the crystal structure of tellurides complete the series of quaternary strontium chalcogenides SrLnCuCh3 (Ch = S, Se, Te). Single crystals of the compounds were synthesized from the elements by the halogenide-flux method at 1070 K. The compounds are crystallizing in two space groups Pnma (Ln = Sm, Gd and Tb) and Cmcm (Ln = Dy–Tm and Lu). For SrSmCuTe3 (a = 11.4592(7), b = 4.3706(3), c = 14.4425(9)

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15

Kasture, M. W., P. N. Joshi, V. V. Joshi, A. L. Choudhari, S. P. Mirajkar, and V. P. Shiralkar. "Influence of the Nature of the Non-Framework Cations on the Sorption Properties of Natural Stilbite." Adsorption Science & Technology 16, no. 9 (1998): 715–31. http://dx.doi.org/10.1177/026361749801600905.

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A natural zeolite of stilbite type, collected from the Deccan traps (Aurangabad, M.S., India), has been investigated for its selectivity sequence in exchanging extra-framework cations for the first time, using Ca2+, Sr2+, Ba2+, Mg2+, Na+ and Ag+ cations as the probe cations. The different cation-exchanged forms were characterised by X-ray powder diffraction, IR spectroscopy, TG/DTA, chemical analysis and water sorption capacity. Water sorption isotherms in the temperature range 303–393 K were obtained as a function of different non-framework cations up to a pressure of 22 Torr. The sorption da

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Bazin, Dominique, Arnaud Dessombz, Christelle Nguyen, et al. "The status of strontium in biological apatites: an XANES/EXAFS investigation." Journal of Synchrotron Radiation 21, no. 1 (2013): 136–42. http://dx.doi.org/10.1107/s1600577513023771.

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Osteoporosis represents a major public health problem through its association with fragility fractures. The public health burden of osteoporotic fractures will rise in future generations, due in part to an increase in life expectancy. Strontium-based drugs have been shown to increase bone mass in postmenopausal osteoporosis patients and to reduce fracture risk but the molecular mechanisms of the action of these Sr-based drugs are not totally elucidated. The local environment of Sr2+cations in biological apatites present in pathological and physiological calcifications in patients without such

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17

Zueva, Olga S., Tahar Khair, Svetlana R. Derkach, Mariia A. Kazantseva, and Yuriy F. Zuev. "Strontium-Induced Gelation of Sodium Alginate in the Presence of Carbon Nanotubes: Elemental Analysis and Gel Structure." Journal of Composites Science 7, no. 7 (2023): 286. http://dx.doi.org/10.3390/jcs7070286.

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The elemental composition and structural features of the junction zones of a strontium–alginate hydrogel and their alteration under the intercalation of multi-walled carbon nanotubes into the hydrogel structure were studied. It was shown that the crosslinking with Sr2+ cations due to electrostatic interactions leads to the association of polymer chains into junction zones with incompletely filled cells. It was found that in strontium alginate, the average cell occupation number of Sr2+ cations is less than 1 and approximately equal to 0.64. In nanocomposite hydrogels including multi-walled car

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Yamamoto, K., H. Nakayama, K. Nunoi, and M. Fujishima. "Interaction of calmodulin with troponin I and the troponin-tropomyosin-actin complex. Effect of Ca2+ and Sr2+ ions." Biochemical Journal 241, no. 3 (1987): 905–9. http://dx.doi.org/10.1042/bj2410905.

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In an effort to elucidate the mechanism of calmodulin regulation of muscle contraction, we investigated the interaction between calmodulin and troponin components in the presence of Ca2+ or Sr2+ by the use of ultracentrifugation methods and polyacrylamide-gel electrophoresis. Skeletal-muscle troponin C bound to troponin I and dissociated it from the tropomyosin-actin complex in the presence of Ca2+ or Sr2+. When troponin T was absent, calmodulin bound to troponin I and dissociated it from the tropomyosin-actin complex in the presence of Ca2+ or Sr2+. When troponin T was present, calmodulin har

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Mashekova, Aiym, Yelnury Baltash, Mukagali Yegamkulov, Ivan Trussov, Zhumabay Bakenov, and Aliya Mukanova. "Polycationic doping of the LATP ceramic electrolyte for Li-ion batteries." RSC Advances 12, no. 46 (2022): 29595–601. http://dx.doi.org/10.1039/d2ra05782d.

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Okada, Konosuke, Takashi Miyano, and Masashi Miyake. "Activation of pig oocytes by intracytoplasmic injection of strontium and barium." Zygote 11, no. 2 (2003): 159–65. http://dx.doi.org/10.1017/s0967199403002193.

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Ovulated mouse oocytes are activated by exposure to culture medium containing Sr2+ or Ba2+ or by intracytoplasmic injection of the divalent cations. It is known that in vitro matured pig oocytes are activated by the intracytoplasmic injection of Ca2+. In this study, we examined the effect of exposure and of intracytoplasmic injection of Sr2+ or Ba2+ on in vitro matured pig oocytes (MII-oocytes). When MII-oocytes were exposed to the medium containing divalent cations, no oocytes were activated. However, in the case of oocytes that were injected with Sr2+, Ba2+ and Ca2+, at 6 h after injection,

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Susilowati, S., N. Karaman, A. R. Prayuga, D. T. Aruba, S. Sukirmiyadi, and L. Suprianti. "The Effect of Sr<sup>2+</sup> and Fe<sup>3+</sup> Cations and the Stirring Speed on The Precipitation of Barium Sulfate in a Batch System." Atom Indonesia 49, no. 3 (2023): 159–67. http://dx.doi.org/10.55981/aij.2023.1341.

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The batch system investigation explored the effect of Sr2+ and Fe3+ cations and the stirring speed on the characteristics of precipitated barium sulfate. A series of experiments were conducted to evaluate the rate of barium sulfate precipitation in laboratory equipment from brines containing barium ions (3500 ppm) and varying amounts of Sr2+ and Fe3+ ions (10 and 20 ppm). Kinetic analysis was also performed to explore how stirring speeds (240 and 480 rpm) affect barium sulfate scales' crystallization by increasing the stirring speed and promoting Sr2+ and Fe3+-cation solubility while decreasin

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Hyoung, Jooeun, Hyeon Woo Lee, So Jin Kim, Hong Rim Shin, and Seung-Tae Hong. "Crystal structure of strontium perchlorate anhydrate, Sr(ClO4)2, from laboratory powder X-ray diffraction data." Acta Crystallographica Section E Crystallographic Communications 75, no. 4 (2019): 447–50. http://dx.doi.org/10.1107/s2056989019003335.

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The crystal structure of strontium perchlorate anhydrate, Sr(ClO4)2, was determined and refined from laboratory powder X-ray diffraction data. The material was obtained by dehydration of Sr(ClO4)2·3H2O at 523 K for two weeks. It crystallizes in the orthorhombic space group Pbca and is isotypic with Ca(AlD4)2 and Ca(ClO4)2. The asymmetric unit contains one Sr, two Cl and eight O sites, all on general positions (Wyckoff position 8c). The crystal structure consists of Sr2+ cations and isolated ClO4 − tetrahedra. The Sr2+ cation is coordinated by eight O atoms from eight ClO4 − tetrahedra. The val

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Maeda, Megumi, Eiichiro Tanaka, Kiyomitsu Shoudai, et al. "Differential Effects of Divalent Cations on Spontaneous and Evoked Glycine Release From Spinal Interneurons." Journal of Neurophysiology 101, no. 2 (2009): 1103–13. http://dx.doi.org/10.1152/jn.90483.2008.

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The effects of Ca2+, Sr2+, and Ba2+ on spontaneous and evoked glycinergic inhibitory postsynaptic currents (mIPSCs and eIPSCs) were studied using the “synaptic bouton” preparation of rat spinal neurons and conventional whole cell recording under voltage-clamp conditions. In response to application of Ca2+-free solution, the frequency of mIPSC initially rapidly decreased to 40∼50% of control followed by a gradual further decline in mIPSC frequency to ∼30% of control. Once mIPSC frequency had significantly decreased in Ca2+-free solution, application of Ca2+, Sr2+, or Ba2+ increased mIPSC freque

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Krishnan, Manoj N., Jon-Paul Bingham, Siew Hwee Lee, Patrick Trombley, and Edward Moczydlowski. "Functional Role and Affinity of Inorganic Cations in Stabilizing the Tetrameric Structure of the KcsA K+ Channel." Journal of General Physiology 126, no. 3 (2005): 271–83. http://dx.doi.org/10.1085/jgp.200509323.

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Crystal structures of the tetrameric KcsA K+ channel reveal seven distinct binding sites for K+ ions within the central pore formed at the fourfold rotational symmetry axis. Coordination of an individual K+ ion by eight protein oxygen atoms within the selectivity filter suggests that ion-subunit bridging by cation–oxygen interactions contributes to structural stability of the tetramer. To test this hypothesis, we examined the effect of inorganic cations on the temperature dependence of the KcsA tetramer as monitored by SDS-PAGE. Inorganic cations known to permeate or strongly block K+ channels

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Tinker, A., and A. J. Williams. "Divalent cation conduction in the ryanodine receptor channel of sheep cardiac muscle sarcoplasmic reticulum." Journal of General Physiology 100, no. 3 (1992): 479–93. http://dx.doi.org/10.1085/jgp.100.3.479.

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The conduction properties of the alkaline earth divalent cations were determined in the purified sheep cardiac sarcoplasmic reticulum ryanodine receptor channel after reconstitution into planar phospholipid bilayers. Under bi-ionic conditions there was little difference in permeability among Ba2+, Ca2+, Sr2+, and Mg2+. However, there was a significant difference between the divalent cations and K+, with the divalent cations between 5.8- and 6.7-fold more permeant. Single-channel conductances were determined under symmetrical ionic conditions with 210 mM Ba2+ and Sr2+ and from the single-channe

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Wang, Wenjia, Xianfang Song, and Ying Ma. "Characterization of controlling hydrogeochemical processes using factor analysis in Puyang Yellow River irrigation district (China)." Hydrology Research 48, no. 5 (2016): 1438–54. http://dx.doi.org/10.2166/nh.2016.233.

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Groundwater chemistry is diverse and complicated and is regulated by both natural hydrogeochemical and anthropogenic processes. Determining the governing processes and their influence on groundwater chemistry is very important to understand groundwater quality evolution and establish reasonable water management strategies. Main cations (Ca2+, Mg2+, Na+, K+, and Sr2+), anions (Cl−, SO2−4, HCO−3, NO−3, and F−), and SiO2 and UV254 of 50 shallow groundwater samples were treated and analyzed. Factor analysis combined with ionic ratio and correlation analysis was used to identify the major hydrogeoc

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Katzka, D. A., R. Cox, A. J. Davidoff, and M. Morad. "Permeation of divalent cations through the Ca2+ channel of rabbit portal vein myocytes." American Journal of Physiology-Heart and Circulatory Physiology 262, no. 2 (1992): H326—H330. http://dx.doi.org/10.1152/ajpheart.1992.262.2.h326.

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The divalent selectivity of the Ca2+ channel in the rabbit portal vein myocyte was examined by the whole cell clamp method. A concentration-dependent selectivity of divalent ion permeation was found such that when Ca2+ was replaced by Ba2+ or Sr2+, the order of maximum current was Ca2+ = Ba2+ greater than Sr2+ at 2 mM and Ba2+ greater than Sr2+ greater than or equal to Ca2+ at 5-10 mM. The possibility of block of the Ca2+ channel by micromolar concentrations of "contaminant" Ca2+ as a determinant of change in the order of selectivity of divalents was examined. Ethylene glycol-bis(beta-aminoeth

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Zachariadis, George, Anastasia Lyratzi, and John Stratis. "Ion chromatographic method for the determination of cations of group IA and IIA in water samples, pharmaceuticals and energy drinks by non-suppressed conductometric detection." Open Chemistry 9, no. 5 (2011): 941–47. http://dx.doi.org/10.2478/s11532-011-0077-8.

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AbstractAn efficient ion chromatographic (IC) method was developed for the simultaneous quantitative determination of Li+, Na+, NH4+, K+, Cs+, Ca2+, Mg2+, Sr2+, Ba2+ and Be2+ in energy drinks, pharmaceutical and drinking water samples by non-suppressed conductometric detection. The separation of ten cations including ammonium was achieved using a cation-exchange column and low conductivity mobile phase. The mobile phase consisted of tartaric acid, dipicolinic acid and boric acid. The separation of the cations was completed in less than 18 min, with a flow rate of 1.2 mL min−1. The separation w

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Gerzen, Oksana P., Veronika O. Votinova, Iulia K. Potoskueva, Alyona E. Tzybina, and Larisa V. Nikitina. "Direct Effects of Toxic Divalent Cations on Contractile Proteins with Implications for the Heart: Unraveling Mechanisms of Dysfunction." International Journal of Molecular Sciences 24, no. 13 (2023): 10579. http://dx.doi.org/10.3390/ijms241310579.

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The binding of calcium and magnesium ions to proteins is crucial for regulating heart contraction. However, other divalent cations, including xenobiotics, can accumulate in the myocardium and enter cardiomyocytes, where they can bind to proteins. In this article, we summarized the impact of these cations on myosin ATPase activity and EF-hand proteins, with special attention given to toxic cations. Optimal binding to EF-hand proteins occurs at an ionic radius close to that of Mg2+ and Ca2+. In skeletal Troponin C, Cd2+, Sr2+, Pb2+, Mn2+, Co2+, Ni2+, Ba2+, Mg2+, Zn2+, and trivalent lanthanides c

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Frańska, Magdalena. "Interactions of Nucleobases with Alkali Earth Metal Cations—Electrospray Ionization Mass Spectrometric Study." European Journal of Mass Spectrometry 13, no. 5 (2007): 339–46. http://dx.doi.org/10.1255/ejms.890.

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Interactions of nucleobases with alkali earth metal cations have been studied by electrospray ionization mass spectrometry (ESI-MS). Nucleobases containing at least one oxygen atom form stable complexes with alkali earth metal cations. This phenomenon can be explained on the grounds of the well known theory of hard and soft acids and bases. Uracil and thymine make complexes only when in their deprotonoted forms. The cations of great radii (Sr2+, Ba2+) are more prone to form complexes of stoichiometry 1:1 with uracil and thymine than the cations of small radii (Mg2+, Ca2+). On the other hand, M

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Liu, Huan, Quan Li, Benqiao He, et al. "High-Efficiency Separation of Mg2+/Sr2+ through a NF Membrane under Electric Field." Membranes 12, no. 1 (2021): 57. http://dx.doi.org/10.3390/membranes12010057.

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The efficient separation of Sr2+/Mg2+ through nanofiltration (NF) technology is a great challenge because Sr2+ and Mg2+ ions are congeners with the same valence and chemical properties. In this work, an NF membrane under an electric field (EF) was successfully employed to separate Mg2+ and Sr2+ ions for the first time. The effects of current densities, Mg2+/Sr2+ mass ratios, pH of the feed, and coexisting cations on separation performance were investigated. Dehydration of Sr2+ or Mg2+ ions under EF was proved by molecular dynamics simulation. The results showed that a high-efficient separation

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Wang, Zhi Hong, Dong Yan Xie, Bao He Yuan, et al. "Synthesis, Thermal Expansion Properties and Raman Spectroscopic Study of Ca_1-xSr_xZr₄P₆O₂₄ Ceramics." Advanced Materials Research 415-417 (December 2011): 1023–27. http://dx.doi.org/10.4028/www.scientific.net/amr.415-417.1023.

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A simplified method with much lower time and energy costs is presented for the rapid synthesis of low thermal expansion materials of CaZr4P6O24, SrZr4P6O24 and their solid solution Ca0.5Sr0.5Zr4P6O24. The coefficients of thermal expansion of CaZr4P6O24, SrZr4P6O24 and Ca0.5Sr0.5Zr4P6O24 are measured to be -1.45×10-6, 2.1×10-6 and 0.26×10-6, respectively. Raman spectroscopic study confirms the formation of the solid solution of Ca0.5Sr0.5Zr4P6O24 though its symmetric and asymmetric stretching modes are obviously broadened with respect to those of CaZr4P6O24 and SrZr4P6O24 due to the lattice def

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33

Gajewski, Melissa, and Mariusz Klobukowski. "DFT studies of complexes between ethylenediamine tetraacetate and alkali and alkaline earth cations." Canadian Journal of Chemistry 87, no. 10 (2009): 1492–98. http://dx.doi.org/10.1139/v09-093.

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Density functional theory (DFT) calculations for M–(C10H12N2O84–) and M–(H2O)6, where M = Na+, K+, Rb+, Mg2+, Ca2+, and Sr2+, and (C10H12N2O84–) = EDTA4–, were carried out at both all-electron and pseudopotential levels. Results from these four methods were compared, and it was found that the ions bind to EDTA4– with selectivity of Mg2+ > Ca2+ > Sr2+ > Na+ > K+ > Rb+.

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34

Gigilev, A. S. "Influence of modification of hydroxyapatites by various cations on its phase composition." Transaction Kola Science Centre 11, no. 3-2020 (2020): 49–51. http://dx.doi.org/10.37614/2307-5252.2020.3.4.009.

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35

Zeng, Xu-Hui, Xiao-Ming Xia, and Christopher J. Lingle. "Divalent Cation Sensitivity of BK Channel Activation Supports the Existence of Three Distinct Binding Sites." Journal of General Physiology 125, no. 3 (2005): 273–86. http://dx.doi.org/10.1085/jgp.200409239.

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Mutational analyses have suggested that BK channels are regulated by three distinct divalent cation-dependent regulatory mechanisms arising from the cytosolic COOH terminus of the pore-forming α subunit. Two mechanisms account for physiological regulation of BK channels by μM Ca2+. The third may mediate physiological regulation by mM Mg2+. Mutation of five aspartate residues (5D5N) within the so-called Ca2+ bowl removes a portion of a higher affinity Ca2+ dependence, while mutation of D362A/D367A in the first RCK domain also removes some higher affinity Ca2+ dependence. Together, 5D5N and D362

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36

Anikanova, L. G., and N. V. Dvoretskii. "The effect of doubly charged ion additives on the activity and chemical stability of catalytically active potassium ferrites." Kataliz v promyshlennosti 20, no. 1 (2020): 33–39. http://dx.doi.org/10.18412/1816-0387-2020-1-33-39.

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To reveal the effect of the dopant doubly charged ion size on the catalytic properties, samples of potassium polyferrites of β′′-alumina type with the composition K2FeII1-q MqFeIII 10O17, where M = Mg, Zn, and K2–2qFeIIMqFeIII 10O17, where M = Ca, Sr, and q = 0.4, were synthesized. The mechanism of action of the introduced doubly charged cations on the activity, selectivity and corrosion resistance of potassium β′′-polyferrite was elucidated. It was shown for the first time that the size of doubly charged cations determines their position in the structure of β′′-polyferrite: they either enter

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37

Tzan, C. J., J. R. Berg, and S. A. Lewis. "Mammalian urinary bladder permeability is altered by cationic proteins: modulation by divalent cations." American Journal of Physiology-Cell Physiology 267, no. 4 (1994): C1013—C1026. http://dx.doi.org/10.1152/ajpcell.1994.267.4.c1013.

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It was previously demonstrated that protamine sulfate (PS, a cationic polypeptide) as well as synthetic cationic polypeptides (CpP, e.g., polylysine and polyarginine) caused an increase in the apical membrane conductance of the mammalian urinary bladder epithelium that was voltage dependent. The membrane conductance induced by these CpP was mediated by a saturable binding site and was partially blocked by CpP (self-inhibition). The PS-induced membrane conductance can be modified by polyvalent cations at three sites. The first site was to competitively inhibit the interaction of PS with an apic

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38

Marshall, I. C., and C. W. Taylor. "Two calcium-binding sites mediate the interconversion of liver inositol 1,4,5-trisphosphate receptors between three conformational states." Biochemical Journal 301, no. 2 (1994): 591–98. http://dx.doi.org/10.1042/bj3010591.

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Cytosolic Ca2+ biphasically regulates Ins(1,4,5)P3-stimulated Ca2+ mobilization in liver [Marshall and Taylor (1993) J. Biol. Chem. 268, 13214-13220]. We have investigated the mechanisms underlying this biphasic control of Ca2+ mobilization in permeabilized hepatocytes by comparing the effects of Sr2+, Ba2+ and Ca2+ on the liver Ins(1,4,5)P3 receptor. Both Ca2+ and Sr2+ increased the binding of [3H]Ins(1,4,5)P3 to liver membranes by converting receptors from a low-affinity (KD approximately 35 nM) to a high-affinity (KD approximately 5 nM) state. Ba2+ (< or = 20 microM) did not affect [3H]I

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Sneddon, John M., and Wanda M. Wenman. "The effect of ions on the adhesion and internalization of Chlamydia trachomatis by HeLa cells." Canadian Journal of Microbiology 31, no. 4 (1985): 371–74. http://dx.doi.org/10.1139/m85-071.

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The adhesion and internalization of Chlamydia trachomatis by HeLa cells was unaffected by removal of K+, Mg2+, or glucose from the incubation medium, slightly reduced by removal of Na+, and significantly reduced by omission of Ca2+. Sr2+, Mg2+, and Mn2+ could replace Ca2+ in the adhesion but only Sr2+ supported internalization, and La3+, Co2+, Fe3+, Ba2+, and Zn2+ all reduced internalization more than adhesion. During initial infection there was no measurable difference in the uptake or release of 45Ca2+ or 86Rb+ between infected and noninfected HeLa monolayers. Infection was not prevented by

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Smart, Megan M., Cheryl A. Moore, Colin D. McMillen, and Joseph W. Kolis. "Hydrothermal Synthesis and Crystal Structure of Vesuvianite Compounds, Ca19Al13Si18O71(OH)7 and Sr19Fe12Ge19O72(OH)6." Crystals 13, no. 8 (2023): 1257. http://dx.doi.org/10.3390/cryst13081257.

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New compositions of synthetic vesuvianite were investigated using hydrothermal synthesis. High quality single crystals with the formula Ca19Al13Si18O71(OH)7 (I) having the vesuvianite-type structure were crystallized during a high temperature hydrothermal growth reaction. Starting materials of Al2O3 and CaSiO3 reacted at 670 °C and 2 kbar in 0.5 M aqueous alkali hydroxide mineralizer to form single crystals up to 0.25 mm per edge. Similar reactions employing SrO, Fe2O3, and GeO2 reacting at 580 °C and 2 kbar in 6 M aqueous alkali hydroxide mineralizers led to the formation of the analogous Sr1

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Matlib, M. A. "Na+-Ca2+ exchange in sarcolemmal membrane vesicles of dog mesenteric artery." American Journal of Physiology-Cell Physiology 255, no. 3 (1988): C323—C330. http://dx.doi.org/10.1152/ajpcell.1988.255.3.c323.

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The kinetic characteristics of a Na+-Ca2+ exchange system in the cell membrane of vascular smooth muscle were explored in vitro in isolated sarcolemmal membrane vesicles of dog mesenteric artery. Na+-loaded vesicles rapidly accumulated Ca2+ when an outwardly directed Na+ concentration gradient was created by suspension of the vesicles in a Na+-free medium. This Ca2+ uptake process was reversible depending on the direction and the magnitude of the Na+ concentration gradient across the membrane of the vesicles. Low temperature, monensin, and external Na+ drastically decreased Ca2+ uptake in Na+-

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42

Araissi, Manel, Imen Ayed, Elimame Elaloui, and Younes Moussaoui. "Removal of barium and strontium from aqueous solution using zeolite 4A." Water Science and Technology 73, no. 7 (2015): 1628–36. http://dx.doi.org/10.2166/wst.2015.640.

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The adsorption efficiency of Sr2+ and Ba2+ from aqueous solutions by zeolite 4A was investigated. Adsorption studies were carried out both in single and binary component systems. The single ion equilibrium adsorption data were fitted to three isotherm models: Langmuir, Freundlich and Dubinin–Radushkevich. The Langmuir model represents the equilibrium data better than the Freundlich model in the studied initial metal concentration (0.3–25 mmol L−1) in both the single and binary component systems. The obtained RL (separation factor or Langmuir parameter) values were in the range of 0–1 indicatin

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43

Boughriet, Abdel, Gildas Doyemet, Nicole Poumaye, Oscar Allahdin, and Michel Wartel. "Insight into Adsorption Kinetics of Cs+, Rb+, Co2+, and Sr2+ on a Zeolites-Based Composite: Comprehensive Diffusional Explanation and Modelling." Applied Sciences 14, no. 8 (2024): 3511. http://dx.doi.org/10.3390/app14083511.

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Kaolinite-rich soils were used to prepare zeolite-based composites via alkaline activation. The porous material was characterized by conducting XRD and microporosity measurements, as well as ESEM microscopy. The Weber and Morris (W-M) model was used for studying adsorption kinetics of radioactive cations on synthesized alkali-activated material. These investigations evidenced the effects of pore structure and the importance of the intrinsic characteristics of hydrated cations (ionic potential; hydrated radius; B-viscosity parameter; molar Gibbs energy of hydration of cation) on W-M kinetic rat

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44

Vetrova, Daria A., and Sergey A. Kuznetsov. "Study of alkaline earth metals cations influence on the electrochemical behaviour of the Ti (IV) / Ti (III) redox couple in the CsCl — CsF melt." Transactions of the Kоla Science Centre of RAS. Series: Engineering Sciences 13, no. 1/2022 (2022): 51–57. http://dx.doi.org/10.37614/2949-1215.2022.13.1.008.

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The influence of the alkaline earth metal cations (Mg2+, Ca2+, Sr2+ и Ва2+) on the charge transfer kinetics of the Ti (IV) / Ti (III) redox couple in melts of alkali metal halides was studied by cyclic voltammetry method. Standard rate constants of charge transfer have been determined by the Nicholson method. The activation energies of the charge transfer process in the CsCl — CsF (10 wt. %) — K2TiF6 melt with the addition of alkaline earth metal cations were calculated.

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45

Grubbs, R. D., C. A. Wetherill, K. Kutschke, and M. E. Maguire. "Magnesium transport in murine S49 lymphoma cells: pharmacology and divalent cation selectivity." American Journal of Physiology-Cell Physiology 248, no. 1 (1985): C51—C57. http://dx.doi.org/10.1152/ajpcell.1985.248.1.c51.

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The murine S49 lymphoma cell transports Mg2+ by a system distinct from systems responsible for Ca2+ influx (J. Physiol. London 337: 351-371, 1983). We have now determined the ability of various cations, anions, and drugs to modulate Mg2+ influx. Neither sulfate, nitrate, phosphate, nor bicarbonate altered Mg2+ influx. Among cations only T1+, Ba2+, Zn2+, Mn2+, Sc3+, and La3+ potently inhibited Mg2+ influx without causing obvious cell toxicity. Seventeen other cations were ineffective at maximal nontoxic concentrations. T1+ inhibition (Ki = 300 micron) is noncompetitive and apparently derives fr

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46

Mollaamin, Fatemeh, and Majid Monajjemi. "Carbon Nanotubes as Biosensors for Releasing Conjugated Bisphosphonates–Metal Ions in Bone Tissue: Targeted Drug Delivery through the DFT Method." C 9, no. 2 (2023): 61. http://dx.doi.org/10.3390/c9020061.

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Bisphosphonate (BP) agents have attracted much attention for their precise therapy in some skeletal maladies demonstrated by enhancing osteoclast-mediated bone resorption. In this work, the use of CAM-B3LYP/6-311+G(d,p)/LANL2DZ to estimate the susceptibility of single-walled carbon nanotube (SWCNT) for adsorbing alendronate, ibandronate, neridronate, and pamidronate chelated to two metal cations of 2Mg2+, 2Ca2+, and 2Sr2+ through nuclear magnetic resonance and thermodynamic parameters has been accomplished. For most biological medications, oral bioavailability is too low to reach a therapeutic

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47

O'Connell, Brett, D. George Stephenson, Ronnie Blazev, and Gabriela M. M. Stephenson. "Troponin C isoform composition determines differences in Sr2+-activation characteristics between rat diaphragm fibers." American Journal of Physiology-Cell Physiology 287, no. 1 (2004): C79—C87. http://dx.doi.org/10.1152/ajpcell.00555.2003.

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Single fibers of rat diaphragm containing different naturally occurring combinations of myofibrillar protein isoforms were used to evaluate the contribution of troponin C (TnC) isoforms to fiber type-related differences with respect to sensitivity to Sr2+of the contractile system. Mechanically skinned fibers were studied for their isometric force vs. Sr2+concentration ([Sr2+]) relationships and then analyzed electrophoretically for myofibrillar protein isoform composition. Our data demonstrate that fiber-type differences in Sr2+dependence of contractile activation processes are primarily deter

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48

Gomonaj, V., P. Gomonaj, N. Golub, K. Szekeresh, B. Charmas, and R. Leboda. "Compatible Adsorption of Strontium and Zinc Ions as Well as Vitamins on Zeolites." Adsorption Science & Technology 18, no. 4 (2000): 295–306. http://dx.doi.org/10.1260/0263617001493440.

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Adsorbents based on natural Sokyrnytsky clinoptilolite have been prepared by treating the base sorbent with aqueous solutions of different salts or acids (HCl, NH4OH or NaCl). The separate adsorption of Zr2+ and Sr2+ ions and of vitamin B1 together with the joint adsorption of Sr2+ ions and vitamin B1 has been investigated on the prepared samples. The adsorption isotherms of the cations were studied both against concentration and time, when superposition of the adsorption and desorption curves was observed. This suggests the possibility of using such adsorbents for the isolation of heavy metal

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Xanthopoulos, Konstantinos, Zafeiria Anagnostou, Sophocles Chalkiadakis, et al. "Platonic Relationships in Metal Phosphonate Chemistry: Ionic Metal Phosphonates." Crystals 9, no. 6 (2019): 301. http://dx.doi.org/10.3390/cryst9060301.

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Phosphonate ligands demonstrate strong affinity for metal ions. However, there are several cases where the phosphonate is found non-coordinated to the metal ion. Such compounds could be characterized as salts, since the interactions involved are ionic and hydrogen bonding. In this paper we explore a number of such examples, using divalent metal ions (Mg2+, Ca2+, Sr2+ and Ni2+) and the phosphonic acids: p-aminobenzylphosphonic acid (H2PABPA), tetramethylenediamine-tetrakis(methylenephosphonic acid) (H8TDTMP), and 1,2-ethylenediphosphonic acid (H4EDPA). The compounds isolated and structurally ch

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Lindsay, A. R., A. Tinker, and A. J. Williams. "How does ryanodine modify ion handling in the sheep cardiac sarcoplasmic reticulum Ca(2+)-release channel?" Journal of General Physiology 104, no. 3 (1994): 425–47. http://dx.doi.org/10.1085/jgp.104.3.425.

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Under appropriate conditions, the interaction of the plant alkaloid ryanodine with a single cardiac sarcoplasmic reticulum Ca(2+)-release channel results in a profound modification of both channel gating and conduction. On modification, the channel undergoes a dramatic increase in open probability and a change in single-channel conductance. In this paper we aim to provide a mechanistic framework for the interpretation of the altered conductance seen after ryanodine binding to the channel protein. To do this we have characterized single-channel conductance with representative members of three c

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