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Статті в журналах з теми "Ions rapides"

Автор: Grafiati

Опубліковано: 23 вересня 2022

Оновлено: 5 листопада 2022

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1

Bouffard, S. "Interaction ions lourds rapides - matière : transferts d'énergie et relaxation de la matière." Journal de Chimie Physique 91 (1994): 995–1004. http://dx.doi.org/10.1051/jcp/1994910995.

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2

Langer, Christoph, and Gesa Kapteina. "Testing the Bromide penetration resistance of concrete: substitution of NaCl by NaBr in Rapide Chloride/Bromide Migration Test (RCM/RBM)." MATEC Web of Conferences 364 (2022): 02022. http://dx.doi.org/10.1051/matecconf/202236402022.

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The chloride migration coefficient of concrete describes the resistance of concrete against chloride ingress. This important material variable can be determined with the rapid chloride migration test (RCM). During the test, chloride ions penetrate concrete by means of an applied electrical field. If the concrete has already been exposed to chlorides before the test starts, the test set up has to be adapted to achieve reliable results. Due to repeated exposure to the same salt (e.g. NaCl), there is no direct possibility to distinguish the chloride ions from the test procedure and the exposure before this, within the initial test procedure. Therefore, the RCM-test setup has been adapted by replacing NaCl through NaBr in the same molar amount. Consequently, this adapted test setup is called the rapid bromide migration test (RBM). The indicator silver nitrate AgNO3 forms sparingly soluble silver salts (AgCl, AgBr) in the presence of halogen ions (e.g. Cl-, Br-), which form a white precipitate in areas with Cl- or Br- ions. The penetration depths are measured at two split cylinder halves. In case the RBM-specimen has previously been exposed to NaCl, an analyzation technique has to be available for the two elements Cl and Br to enable a differentiation. As the white precipitate areas - a result of the formation of AgCl and AgBr - have a quite similar visual appearance, a differentiation cannot be achieved and other analytical techniques have to be considered. With laser-induced breakdown spectroscopy (LIBS), it is possible to determine the depth-dependent ion quantity (wt.-% of Cl or wt.-% of Br). In this study, it is shown by test results that it is possible to exchange NaCl by NaBr in the RCM test, since the penetration behavior of both ions (Cl-, Br-) is very similar in the migration test.

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3

Wang, Hai-Ning, Ping-Xiao Liu, He Chen, Ning Xu, Zi-Yan Zhou, and Shu-Ping Zhuo. "Tubular porous coordination polymer for the selective sensing of Cu2+ ions and cyclohexane in mixed suspensions of metal ions via fluorescence quenching." RSC Advances 5, no. 80 (2015): 65110–13. http://dx.doi.org/10.1039/c5ra10336c.

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4

Spencer, A. J., L. A. Hawkey, A. LeFurgey, K. G. Dickman, L. J. Mandel, and P. Ingram. "Quantitative EPXMA imaging of rapidly frozen kidney proximal tubule primary cultures." Proceedings, annual meeting, Electron Microscopy Society of America 48, no. 2 (August 12, 1990): 160–61. http://dx.doi.org/10.1017/s0424820100134399.

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Understanding the role of elements/ions (particularly calcium) in processes such as cellular injury in the kidney requires not only assessment of total cell element and its cytoplasmic free ion, but also identification of the sites of release, uptake and binding of those ions/elements within the cells and correlation with physiological lesions such as changes in cell metabolism. Short term anoxia (40min) does not appear to alter Ca compartmentation in kidney proximal tubule cells. However, the effects of longer periods of anoxia and subsequent recovery have not been studied due to the lack of a suitable in vitro model. Quantitative electron probe x ray (EPXMA) imaging facilitates assessment of cell ultrastructure and measurement of total element with high lateral spatial resolution. We have therefore applied EPXMA imaging to a recently described preparation of primary kidney proximal tubule cultures, which retain the in vivo metabolic features of proximal tubules for longer periods of time in vitro.

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5

Bhowmick, Rahul, Abu Saleh Musha Islam, Atul Katarkar, Keya Chaudhuri, and Mahammad Ali. "Surfactant modulated aggregation induced enhancement of emission (AIEE)—a simple demonstration to maximize sensor activity." Analyst 141, no. 1 (2016): 225–35. http://dx.doi.org/10.1039/c5an01916h.

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A rhodamine-based chemosensor, L3, selectively and rapidly recognizes Hg²⁺ ions in the presence of all biologically relevant metal ions and toxic heavy metals with a detection limit of 78 nM along with possessing cytoplasmic cell imaging applications.

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6

Zhang, J., M. H. Key, P. A. Norreys, C. Danson, D. Neely, S. J. Rose, F. Walsh, et al. "Characteristics of rapidly recombining plasmas suitable for high-gain X-ray laser action." Laser and Particle Beams 14, no. 1 (March 1996): 71–79. http://dx.doi.org/10.1017/s0263034600009770.

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Recombining plasmas produced by picosecond laser pulses are characterized by measuring ratio of intensities of resonance lines of H- and He-like ions in the plasmas. It is found that the rapidly recombining plasmas produced by picosecond laser pulses are suitable for highgain operation.

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7

Shih, Min-Hsiu, and Fu-Chin Huang. "Effects of Photodynamic Therapy on Rapidly Growing Nontuberculous Mycobacteria Keratitis." Investigative Opthalmology & Visual Science 52, no. 1 (January 5, 2011): 223. http://dx.doi.org/10.1167/iovs.10-5593.

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8

Petroll, W. Matthew, Mridula Vishwanath, and Lisha Ma. "Corneal Fibroblasts Respond Rapidly to Changes in Local Mechanical Stress." Investigative Opthalmology & Visual Science 45, no. 10 (October 1, 2004): 3466. http://dx.doi.org/10.1167/iovs.04-0361.

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9

Abeish, Abdulbasit M., H. Ming Ang, and Hussein Znad. "Role of ferric and ferrous ions in the enhancement of the heterogeneous solar photocatalytic degradation of combined mixture of chlorophenols." Water Science and Technology 72, no. 9 (July 17, 2015): 1561–68. http://dx.doi.org/10.2166/wst.2015.374.

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The solar photocatalytic degradation of 4-chlorophenol (4-CP) and 2,4-dichlorophenol (2,4-DCP) was investigated individually and combined in the presence of Fe2+ and Fe3+ ions. The results revealed that both Fe2+ and Fe3+ ions enhanced the heterogeneous photocatalytic degradation. Fe3+ ions rapidly converted to Fe2+ ions as soon as the irradiation started. The intermediates formed during the degradation of 4-CP/2,4-DCP were also monitored and identified. Three main intermediates were observed, hydroquinone, phenol, and 4-chlorocatechol with traces of benzoquinone. The results support a new trend of research by utilising other cheap iron ion sources in the photocatalytic degradation.

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10

Hsieh, Min-Ying, and Po-Jung Huang. "Magnetic nanoprobes for rapid detection of copper ion in aqueous environment by surface-enhanced Raman spectroscopy." RSC Advances 12, no. 2 (2022): 921–28. http://dx.doi.org/10.1039/d1ra07482b.

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11

Tatsumisago, Masahiro, Kazuya Yoneda, Nobuya Machida, and Tsutomu Hinami. "Ionic conductivity of rapidly quenched glasses with high concentration of lithium ions." Journal of Non-Crystalline Solids 95-96 (December 1987): 857–64. http://dx.doi.org/10.1016/s0022-3093(87)80691-9.

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12

Bakhti, Abdellah, and Mohand Saïd Ouali. "Étude des facteurs contrôlant la sorption de Cr(VI) sur une hydrotalcite de synthèse." Revue des sciences de l'eau 20, no. 2 (June 4, 2007): 241–50. http://dx.doi.org/10.7202/015882ar.

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Résumé La sorption des ions chromate de solutions aqueuses sur une hydrotalcite de synthèse et sur son produit de calcination a été étudiée. L’interaction de ces matériaux avec les ions chromate montre que la cinétique de sorption est rapide et suit une expression de vitesse de sorption réversible du premier ordre. Les influences du pH, de la concentration en ions chromate de la solution et de la température ont été étudiées afin d’optimiser la sorption. Le traitement de solutions contenant de 10 à 200 mg L-1 de Cr(VI) a donné de bons résultats. Les capacités de sorption de ces matériaux sont 1,3 et 2,4 mmol g‑1 de Cr(VI), respectivement. L’étude de la réversibilité de la sorption des ions chromate indique qu’il est possible d’utiliser les hydrotalcites calcinées comme sorbants recyclables. Ceci suggère notamment que ces derniers pourraient constituer d’intéressants supports pour le piégeage d’ions chromate.

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13

Zhang, Wan You, Sheng Chao Ji, Hai Feng Zhang, and Xi Xin Zhang. "Metal Ions on the Membrane Bioreactor in the Slow Progress of Membrane Fouling Studies." Advanced Materials Research 926-930 (May 2014): 158–61. http://dx.doi.org/10.4028/www.scientific.net/amr.926-930.158.

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Membrane bioreactor (MBR) has developed rapidly in recent years; however, the membrane fouling problems are affecting its further widespread application. This paper discusses the role of metal ions in the mixture in the mechanism; also on the high-priced metal ions coexist in the mixture when the effects of biological flocculation process; finally, the direction of future research in this area are summarized.

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14

Chovancova, Barbora, Veronika Liskova, Petr Babula, and Olga Krizanova. "Role of Sodium/Calcium Exchangers in Tumors." Biomolecules 10, no. 9 (August 31, 2020): 1257. http://dx.doi.org/10.3390/biom10091257.

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The sodium/calcium exchanger (NCX) is a unique calcium transport system, generally transporting calcium ions out of the cell in exchange for sodium ions. Nevertheless, under special conditions this transporter can also work in a reverse mode, in which direction of the ion transport is inverted—calcium ions are transported inside the cell and sodium ions are transported out of the cell. To date, three isoforms of the NCX have been identified and characterized in humans. Majority of information about the NCX function comes from isoform 1 (NCX1). Although knowledge about NCX function has evolved rapidly in recent years, little is known about these transport systems in cancer cells. This review aims to summarize current knowledge about NCX functions in individual types of cancer cells.

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15

El-Ashram, Tarek, and A. S. El-Said. "Modifications induced by swift heavy ions in rapidly solidified Sn–8.5Sb–5.5Cu alloy." Radiation Effects and Defects in Solids 166, no. 4 (April 2011): 272–81. http://dx.doi.org/10.1080/10420150.2010.516393.

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16

Zhao, Fengxin, Yifan Liu, Tao Song, Bin Zhang, Dongxiao Li, Yumei Xiao, and Xingdong Zhang. "A chitosan-based multifunctional hydrogel containing in situ rapidly bioreduced silver nanoparticles for accelerating infected wound healing." Journal of Materials Chemistry B 10, no. 13 (2022): 2135–47. http://dx.doi.org/10.1039/d1tb02850b.

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Анотація:

A double-crosslinked hydrogel with injectability, self-healing capability, stability, and antibiosis was developed. Silver ions were in situ bioreduced to AgNPs rapidly and uniformly at the same time as the formation of hydrogels.

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17

Zhou, Zhiqiang, Shiyong Liang, Shaolong Chen, Pengpeng Zhou, Wei Sun, Jun Xiao, Yao Huang, Hua Guan, and Kelin Gao. "Deceleration of highly charged Ni ions with compressed longitudinal kinetic energy distribution by a falling potential." AIP Advances 12, no. 3 (March 1, 2022): 035220. http://dx.doi.org/10.1063/5.0085069.

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Higher-precision optical clocks based on highly charged ions (HCIs) have become one of the means to explore new physics beyond the standard model. Usually, HCIs are produced by electron bombardment with high kinetic energy. Therefore, to realize an optical clock, the deceleration of HCIs is necessary. In this study, the design and operation of a deceleration beamline to produce low-energy HCIs are presented. We used time-of-flight technology to select pure 58Ni12+ ions. The longitudinal kinetic energy distribution of the ion beam was compressed from 11.4(4)qV (q is the electric charge of ions) to 2.2(3)qV by employing a rapidly decreasing voltage. Adopting a deceleration lens system, the longitudinal kinetic energy of the 58Ni12+ ions was reduced from 678.2(3)qV to 2.0(3)qV.

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18

Xie, Tian, Jie Ding, Xiaoxu Han, Huizhen Jia, Yang Yang, Shuang Liang, Wenxin Wang, Wenguang Liu, and Wei Wang. "Wound dressing change facilitated by spraying zinc ions." Materials Horizons 7, no. 2 (2020): 605–14. http://dx.doi.org/10.1039/c9mh01255a.

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It is a tough task in clinic to remove and refuel the dressing. Therefore, we have explored a bioinspired dressing which can be swiftly detached from wound beds and rapidly strengthened during the dressing change procedures.

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19

Nath, Peuli, Ravi Kumar Arun, and Nripen Chanda. "Smart gold nanosensor for easy sensing of lead and copper ions in solution and using paper strips." RSC Advances 5, no. 84 (2015): 69024–31. http://dx.doi.org/10.1039/c5ra14886c.

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20

Nath, Peuli, Ravi Kumar Arun, and Nripen Chanda. "A paper based microfluidic device for the detection of arsenic using a gold nanosensor." RSC Adv. 4, no. 103 (2014): 59558–61. http://dx.doi.org/10.1039/c4ra12946f.

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21

Aragão, Débora Martins, Maria de Lara P. M. Arguelho, Carolina Mangieri Oliveira Prado, and José do Patrocinio Hora Alves. "Use of Natural Kaolinite Clay as an Adsorbent to Remove PB(II), CD(II), and CU(II) from Aqueous Solution." Materials Science Forum 805 (September 2014): 581–84. http://dx.doi.org/10.4028/www.scientific.net/msf.805.581.

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Natural kaolinite clay collected in the State of Sergipe (northeast Brazil) was used as an adsorbent for the ions Pb2+, Cd2+, and Cu2+present in aqueous solution. Adsorption equilibrium was reached rapidly, enabling use of a contact time of 30 minutes, and maximum adsorption was achieved at pH 7.0. For all three metal ions, the adsorption data could be fitted using the Langmuir isotherm and the adsorption process obeyed a pseudo-second order kinetic model.

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22

Zhu, Yuanzhi, Man Qiao, Wenchao Peng, Yang Li, Guoliang Zhang, Fengbao Zhang, Yafei Li, and Xiaobin Fan. "Rapid exfoliation of layered covalent triazine-based frameworks into N-doped quantum dots for the selective detection of Hg2+ions." Journal of Materials Chemistry A 5, no. 19 (2017): 9272–78. http://dx.doi.org/10.1039/c7ta01438d.

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23

Zhang, Dan, Lan Wang, Hehua Zeng, Baker Rhimi, and Chuanyi Wang. "Novel polyethyleneimine functionalized chitosan–lignin composite sponge with nanowall-network structures for fast and efficient removal of Hg(ii) ions from aqueous solution." Environmental Science: Nano 7, no. 3 (2020): 793–802. http://dx.doi.org/10.1039/c9en01368g.

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An environmental-friendly polyethyleneimine functionalized chitosan–lignin composite sponge with interconnected nanowall-network structures is feasibly fabricated for rapidly and selectively removing Hg(ii) ions from aqueous solution.

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24

Horiuchi, Keizo, and Daiyu Nakamura. "Chlorine Nuclear Spin-Spin Relaxation Mechanism in Mg(H2O)6SnCl6 as Studied by NQR and NMR Techniques." Zeitschrift für Naturforschung A 47, no. 1-2 (February 1, 1992): 277–82. http://dx.doi.org/10.1515/zna-1992-1-247.

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AbstractThe 35Cl NQR spin-lattice relaxation time T1Q, spin-spin-relaxation time T2Q, and 1H NMR spin-lattice relaxation time in the rotating frame T1Q in Mg(H2O) 6SnCl6 were measured as functions of temperature. Above room temperature T2Q increased rapidly with increasing temperature, which can be explained by fluctuations of the local magnetic field at the chlorine nuclei due to cationic motions. From the T1Q experiments, these motions are found to be attributable to uniaxial and overall reorientations of [Mg(H2O)6 ] 2 + ions with activation energies of 95 and 116 kJ mol - 1 , respectively. Above ca. 350 K, T1Q decreased rapidly with increasing temperature, which indicates a reorientational motion of [SnCl6] 2 - ions with an activation energy of 115 kJ mol -1 .

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25

Wang, De Guo. "Visual Detection of Mycobacterium tuberculosis Complex with Loop-Mediated Isothermal Amplification and Eriochrome Black T." Applied Mechanics and Materials 618 (August 2014): 264–67. http://dx.doi.org/10.4028/www.scientific.net/amm.618.264.

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The present study was aimed to improve the method for detecting Mycobacterium tuberculosis complex recently reported on Letters in Applied Microbiology. Eriochrome black T (EBT) was added to the reaction system of LAMP, due to complexation of EBT with magnesium ions, the color of reaction solution was red at beginning, when the reaction was in process, the precipitate of magnesium ions and pyrophosphate ions formed, EBT lost magnesium ions, the color of reaction solution became sky blue from red gradually, and the method exhibits a high sensitivity of 8 fg/μL. The improved LAMP assay can detect Mycobacterium tuberculosis complex rapidly, sensitively and visually, the method developed in this study had solved the “bottleneck” in popularization and application of LAMP technology, which had not only avoided aerosol pollution but also solved the false positive problem caused by primer dimers.

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26

Kokotou, Maroula G. "Study of the Fragmentation Pathways of Sulfonamides by High-resolution Mass Spectrometry: Application to their Detection in Plasma by Direct Infusion." Current Pharmaceutical Analysis 16, no. 5 (June 15, 2020): 513–19. http://dx.doi.org/10.2174/1573412915666181205115350.

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Background: The high resolving and accuracy power of the HRMS instrument enabled us to identify the product ions and to propose detailed fragmentation pathways and diagnostic fragment ions. Methods: In the present work, the fragmentation pathways of five sulfonamides antibiotics, namely sulfamerazine, sulfathiazole, sulfadiazine, sulfadimethoxine and sulfamethoxazole, by High-Resolution Mass Spectrometry (HRMS) are presented. The HRMS spectra were recorded with a Q-TOF (Time of Flight) spectrometer with Electrospray Ionization (ESI) in both negative and positive mode. Results: Specific characteristic ions for each one of the sulfonamide antibiotics under positive ESI mode are proposed for the first time. Fragment ions of this particular class of analytes may be used to rapidly identify compounds with common structural features. Conclusion: The direct infusion of plasma samples, avoiding any prior chromatographic steps, to identify the existence of sulfonamide antibiotics is demonstrated herein.

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27

Choy, Young Bin, Samirkumar R. Patel, Jung-Hwan Park, Bernard E. McCarey, Henry F. Edelhauser, and Mark R. Prausnitz. "Mucoadhesive Microparticles in a Rapidly Dissolving Tablet for Sustained Drug Delivery to the Eye." Investigative Opthalmology & Visual Science 52, no. 5 (April 22, 2011): 2627. http://dx.doi.org/10.1167/iovs.10-6465.

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28

Lansman, J. B., P. Hess, and R. W. Tsien. "Blockade of current through single calcium channels by Cd2+, Mg2+, and Ca2+. Voltage and concentration dependence of calcium entry into the pore." Journal of General Physiology 88, no. 3 (September 1, 1986): 321–47. http://dx.doi.org/10.1085/jgp.88.3.321.

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We studied the blocking actions of external Ca2+, Mg2+, Ca2+, and other multivalent ions on single Ca channel currents in cell-attached patch recordings from guinea pig ventricular cells. External Cd or Mg ions chopped long-lasting unitary Ba currents promoted by the Ca agonist Bay K 8644 into bursts of brief openings. The bursts appear to arise from discrete blocking and unblocking transitions. A simple reaction between a blocking ion and an open channel was suggested by the kinetics of the bursts: open and closed times within a burst were exponentially distributed, the blocking rate varied linearly with the concentration of blocking ion, and the unblocking rate was more or less independent of the blocker concentration. Other kinetic features suggested that both Cd2+ and Mg2+ lodge within the pore. The unblocking rate was speeded by membrane hyperpolarization or by raising the Ba concentration, as if blocking ions were swept into the myoplasm by the applied electric field or by repulsive interaction with Ba2+. Ca ions reduced the amplitude of unitary Ba currents (50% inhibition at approximately 10 mM [Ca]o with 50 mM [Ba]o) without detectable flicker, presumably because Ca ions exit the pore very rapidly following Ba entry. However, Ca2+ entry and exit rates could be resolved when micromolar Ca blocked unitary Li+ fluxes through the Ca channel. The blocking rate was essentially voltage independent, but varied linearly with Ca concentration (rate coefficient, 4.5 X 10(8) M-1s-1); evidently, the initial Ca2+-pore interaction is outside the membrane field and much faster than the overall process of Ca ion transfer. The unblocking rate did not vary with [Ca]o, but increased steeply with membrane hyperpolarization, as if blocking Ca ions were driven into the cell. We suggest that Ca is both an effective permeator and a potent blocker because it dehydrates rapidly (unlike Mg2+) and binds to the pore with appropriate affinity (unlike Cd2+). There appears to be no sharp dichotomy between "permeators" and "blockers," only quantitative differences in how quickly ions enter and leave the pore.

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29

Ghaedi, M., M. Rezakhani, S. Khodadoust, K. Niknam, and M. Soylak. "The Solid Phase Extraction of Some Metal Ions Using Palladium Nanoparticles Attached to Silica Gel Chemically Bonded by Silica-Bonded N-Propylmorpholine as New Sorbent prior to Their Determination by Flame Atomic Absorption Spectroscopy." Scientific World Journal 2012 (2012): 1–9. http://dx.doi.org/10.1100/2012/764195.

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In this research at first palladium nanoparticle attached to a new chemically bonded silica gel has been synthesized and has been characterized with different techniques such as X-ray diffraction (XRD), fourier transform infrared (FT-IR), transmission electron microscopy (TEM), and scanning electron microscopy (SEM). Then, this new sorbent (chemically modified silica gel with N-propylmorpholine (PNP-SBNPM)) was efficiently used for preconcentration of some metal ions in various food samples. The influence of effective variables including mass of sorbent, flow rate, pH of sample solutions and condition of eluent such as volume, type and concentration on the recoveries of understudy metal ions were investigated. Following the optimization of variables, the interfering effects of some foreign ions on the preconcentration and determination of the investigated metal ions described. At optimum values of variables, all investigated metal ions were efficiently recovered with efficiency more than 95%, relative standard deviation (RSD) between 2.4 and 2.8, and detection limit in the range of 1.4–2.7 ng mL−1. The present method is simple and rapidly applicable for the determination of the understudied metal ions (ng mL−1) in different natural food samples.

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30

Van Tendeloo, G., M.-O. Ruault, H. Bernas, and M. Gasgnier. "High resolution electron microscopy of ion-irradiated GdBa2Cu3O7." Journal of Materials Research 6, no. 4 (April 1991): 677–81. http://dx.doi.org/10.1557/jmr.1991.0677.

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GdBa2Cu3O7 crystals were irradiated at room temperature with 200 keV Ne ions and 300 keV Xe ions. In situ standard TEM and further HREM studies show two types of extended defects: (i) mobile extended defects, which account for the preferential defect pinning to twin boundaries reported earlier. These defects are rapidly recovered and difficult to observe by HREM investigations; (ii) stable amorphous areas which are clearly identified by HREM observations. Their overlapping and aggregation conceivably lead to amorphization of the sample.

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31

Wu, Ze, Tao Jiang, Nai Xiang Liang, Ya Ling Sun, and Li Min Dong. "Study on Preparation and Luminescence of Green Phosphate Phosphor." Applied Mechanics and Materials 274 (January 2013): 467–70. http://dx.doi.org/10.4028/www.scientific.net/amm.274.467.

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In this article, La0.6Ce0.27Tb0.13PO4 green phosphor has been successfully synthesized through the method of co-percipition. The surface composition, morphology, and fluorescence properties of luminescent materials were characterized by XRD, SEM, and PL. The results showed that: the added sensitizer of Ce3+ ion rapidly increased the fluorescence intensity, further proved that Ce3+ ions have sensitization on Tb3+ ions. In system of La1-x-yPO4: yCe, the fluorescence intensity of xTb, La0.8PO4:0.1Ce,0.1Tb is strongest, and it’s the best ratio of the system.

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32

Mousseau, Fanny, Chao Yu, Antigoni Alexandrou, and Cédric Bouzigues. "L’imagerie optique de nanoparticules luminescentes : de la détection de biomolécules au diagnostic in vitro." Photoniques, no. 106 (January 2021): 30–33. http://dx.doi.org/10.1051/photon/202110630.

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Pour détecter des biomolécules et pathogènes (protéines, virus, bactéries, …) avec des sensibilités satisfaisantes, il est actuellement nécessaire d’utiliser des appareils de laboratoires coûteux. En combinant les remarquables propriétés optiques des ions lanthanides à un lecteur simple couplé à un smartphone, nous démontrons comment développer un système de détection portable, rapide et ultrasensible.

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Ding, JP, PM Badot, and BG Pickard. "Aluminium and Hydrogen Ions Inhibit a Mechanosensory Calcium-Selective Cation Channel." Functional Plant Biology 20, no. 6 (1993): 771. http://dx.doi.org/10.1071/pp9930771.

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tension-dependent activity of mechanosensory calcium-selective cation channels in excised plasma- lemmal patches from onion bulb scale epidermis is modulated by pH in the physiologically meaningful range between 4.5 and 7.2. It is rapidly lowered by lowering pH and rapidly raised by raising pH. Channel activity is effectively inhibited by low levels of aluminium ions and activity can be partially restored by washing for a few minutes. We suggest that under normal conditions the sensitivity of the mechanosensory channels to pH of the wall free space plays important roles in regulation of plant activities such as growth. We further suggest that, when levels of acid and aluminium ions in the soil solution are high, they might inhibit similar sensory channels in cells of the root tip, thus contributing critically to the acid soil syndrome.

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Dr. Arijit Das, Dr Arijit Das. "A Rapid and Innovative Method for the Easy Prediction of Magnetic Behavior of Homo and Hetero Nuclear Mono and Diatomic Molecules Or Ions without Mot." Indian Journal of Applied Research 3, no. 10 (October 1, 2011): 1–2. http://dx.doi.org/10.15373/2249555x/oct2013/13.

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Jayaratne, E. Rohan, Xuan Ling, and Lidia Morawska. "Suppression of Cluster Ions during Rapidly Increasing Particle Number Concentration Events in the Environment." Aerosol and Air Quality Research 15, no. 1 (2015): 28–37. http://dx.doi.org/10.4209/aaqr.2014.05.0106.

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Keller, Bernd O., Abdelhamid A. Esbata, Erwin Buncel, and Gary W. van Loon. "Rapidly formed quinalphos complexes with transition metal ions characterized by electrospray ionization mass spectrometry." Rapid Communications in Mass Spectrometry 27, no. 12 (May 7, 2013): 1319–28. http://dx.doi.org/10.1002/rcm.6570.

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37

Bonafede, Lucas, Can H. Ficicioglu, Leona Serrano, Grace Han, Jessica I. W. Morgan, Monte D. Mills, Brian J. Forbes, et al. "Cobalamin C Deficiency Shows a Rapidly Progressing Maculopathy With Severe Photoreceptor and Ganglion Cell Loss." Investigative Opthalmology & Visual Science 56, no. 13 (December 11, 2015): 7875. http://dx.doi.org/10.1167/iovs.15-17857.

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He, Dengliang, Guangfu Yin, Faqin Dong, Laibao Liu, Xiaoli Tan, and Wangyang He. "Removal of lead(II) and copper(II) from aqueous solution using foitite from Linshou mine in Hebei, China." Water Science and Technology 64, no. 8 (October 1, 2011): 1620–28. http://dx.doi.org/10.2166/wst.2011.735.

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Foitite from Linshou mine in China's Hebei province was investigated as an adsorbent to remove Pb(II) and Cu(II) from aqueous solution. The results showed that foitite can readily remove heavy metal ions from aqueous solution. The data shows that the metal uptake for Pb(II) increases rapidly, accounting for 74.47% when contact time was 2 min. In contrast to Pb(II), there was a worse capability for adsorption of Cu(II). In the first 4 min, the metal uptake accounted for 34.7%. According to the analytical results obtained from X-ray diffraction, laser Raman spectrum, X-ray energy dispersive spectrometer, and Zeta potential, the removal mechanism of Pb(II) and Cu(II) by using foitite can be explained as following: firstly, the existence of an electrostatic field around foitite particles can attract heavy metal ions and consequently combine heavy metal ions with OH−; secondly, heavy metal ions in the solution are exchanged with the Fe3+ and Al3+ in the foitite.

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39

Du, Xinfeng, Niping Li, Qinghan Chen, Zeying Wu, Jingying Zhai, and Xiaojiang Xie. "Perspective on fluorescence cell imaging with ionophore-based ion-selective nano-optodes." Biomicrofluidics 16, no. 3 (May 2022): 031301. http://dx.doi.org/10.1063/5.0090599.

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Inorganic ions are ubiquitous in all kinds of cells with highly dynamic spatial and temporal distribution. Taking advantage of different types of fluorescent probes, fluorescence microscopic imaging and quantitative analysis of ion concentrations in cells have rapidly advanced. A family of fluorescent nanoprobes based on ionophores has emerged in recent years with the potential to establish a unique platform for the analysis of common biological ions including Na+, K+, Ca2+, Cl−, and so on. This article aims at providing a retrospect and outlook of ionophore-based ion-selective nanoprobes and the applications in cell imaging.

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40

Wullt, Marlene, Inga Odenholt, and Mats Walder. "Activity of Three Disinfectants and Acidified Nitrite AgainstClostridium difficileSpores." Infection Control & Hospital Epidemiology 24, no. 10 (October 2003): 765–68. http://dx.doi.org/10.1086/502129.

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AbstractObjective:To identify environmentally safe, rapidly acting agents for killing spores ofClostridium difficilein the hospital environment.Design:Three classic disinfectants (2% glutaraldehyde, 1.6% peracetyl ions, and 70% isopropanol) and acidified nitrite were compared for activity againstC. difficilespores. Four strains ofC. difficilebelonging to different serogroups were tested using a dilution–neutralization method according to preliminary European Standard prEN 14347. For peracetyl ions and acidified nitrite, the subjective cleaning effect and the sporicidal activity was also tested in the presence of organic load.Results:Peracetyl ions were highly sporicidal and yielded a minimum 4 log10reduction of germinating spores already at short exposure times, independent of organic load conditions. Isopropanol 70% showed low or no inactivation at all exposure times, whereas glutaraldehyde and acidified nitrite each resulted in an increasing inactivation factor (IF) over time, from an IF greater than 1.4 at 5 minutes of exposure time to greater than 4.1 at 30 minutes. Soiling conditions did not influence the effect of acidified nitrite. There was no difference in the IF among the 4 strains tested for any of the investigated agents. Acidified nitrite demonstrated a good subjective cleaning effect and peracetyl ions demonstrated a satisfactory effect.Conclusions:Cidal activity was shown againstC. difficilespores by glutaraldehyde, peracetyl ions, and acidified nitrite. As acidified nitrite and peracetyl ions are considered to be environmentally safe chemicals, these agents seem well suited for the disinfection ofC. difficilespores in the hospital environment.

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41

Lauerer, Brigitte, A. Pusch, K. H. Stadler, and H. P. Boehm. "Adsorption of Tetrammine-carbonato and -cis-diaqua and Triethylenetetramine-carbonato and -cis-diaqua Complexes of Cobalt(III) on Titanium Dioxide as Models for the Binding of Uranyl Ions from the Tricarbonatouranyl Complex Ion." Zeitschrift für Naturforschung B 47, no. 5 (May 1, 1992): 625–34. http://dx.doi.org/10.1515/znb-1992-0504.

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The adsorption of several cobalt(III) complex ions with carbonato or two aqua ligands in cis-position (and related complexes) was studied with the objective of a comparison with the adsorption of UO22+ ions from [UO2(CO3)3]4- solutions. One CO32- group per adsorbed UO22+ ion was found on the TiO2 surface after vacuum-drying at room temperature. Pre-adsorption of HPO42- ions resulted in an increased UO22+ uptake, whilst coverage of the TiO2 surface with adsorbed Al hydroxo complexes resulted in the opposite effect. The adsorption rate as well as the saturation uptake were higher for the cis-[Co(NH3)4(H2O)2]3+ complex than for [Co(NH3)4(CO3)]+. The diffuse reflectance spectra are similar for both adsorbates. Also with cis-[Co(trien)(H2O)2]3+ and [Co(trien)(CO3)]+ the diaqua is more rapidly adsorbed, whereas the saturation values are very similar. No carbonate is found in the adsorbates with both carbonato complexes, the ammine or trien ligands are retained on the adsorbed CoIII ions, however. Temperature-programmed decomposition spectra showed that the bonding of the ammine ligands is weakened in the adsorbed complexes compared to bulk salts of the complex ions. It is concluded that the metal complexes are anchored to the TiO2 surface by bonding to two surface oxygen ions.

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Bondarenko, G. G., V. I. Kristya, D. O. Savichkin, and P. Żukowski. "Simulation of cathode surface sputtering by ions and fast atoms in Townsend discharge in argon-mercury mixture with temperature-dependent composition." Devices and Methods of Measurements 9, no. 3 (September 17, 2018): 227–33. http://dx.doi.org/10.21122/2220-9506-2018-9-3-227-233.

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The mixture of argon and mercury vapor is used as the background gas in different types of gas discharge illuminating lamps. The aim of this work was development of a model, describing transport of electrons, ions and fast atoms in the one-dimensional low-current gas discharge in argon-mercury mixture, and determination of the dependence of their contributions to the cathode sputtering, limiting the device service time, on the temperature.For simulation of motion of electrons we used the Monte Carlo method of statistical modeling, whereas the ion and metastable excited atom motion, in order to reduce the calculation time, we described on the basis of their macroscopic transport equations, which allowed to obtain their flow densities at the cathode surface. Then, using the Monte Carlo method, we found the energy spectra of ions and fast atoms, generated in collisions of ions with mixture atoms, at the cathode surface and also the effective coefficients of the cathode sputtering by each type of particles.Calculations showed that the flow densities of argon ions and fast argon atoms, produced in collisions of argon ions with slow argon atoms, do not depend on the temperature, while the flow densities of mercury ions and fast argon atoms generated by them grow rapidly with the temperature due to an increase of mercury content in the mixture.There are represented results of modeling of the energy spectra of ions and fast atoms at the cathode surface. They demonstrate that at low mercury content in the mixture of the order of 10–3 the energies of mercury ions exceed that of the other types of particles, so that the cathode is sputtered mainly by mercury ions, and their contribution to sputtering is reduced at a mixture temperature decrease.

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Fu, F., Y. Guo, X. Lu, P. Zhao, S. Zou, H. Wang, R. Gao, and C. Pei. "Forensic analysis of soman exposure using characteristic fragment ions from protein adducts." Human & Experimental Toxicology 40, no. 9 (March 17, 2021): 1519–27. http://dx.doi.org/10.1177/09603271211001111.

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The verification of exposure to nerve agents is a serious challenge, especially in cases of soman (GD) poisoning. Protein adducts are reliable biomarkers, that provide forensic information and evidence during incidents of terrorism or sporadic poisoning. Mass spectrometry, coupled with a proteomics approach, was established for the forensic analysis of GD-based protein adducts. The fragmentation pathways of GD-based protein adducts were investigated for the first time using electrospray ionization tandem mass spectrometry. Three abundant natural loss product ions, [M+2H-54]2+ (loss of two carbon cations), [M+2H-72]2+ (loss of tert-butyl and methyl moieties), and [M+2H-84]2+ (loss of the pinacolyl moieties), were observed in each of the GD-labeled adducts, and the product ions were independent of protein structure and exposure route. A unique mechanism for the formation of product ions involving GD-protein adducts is proposed here. These findings support the development of a simple and precise forensic analysis technique to rapidly verify GD poisoning using these three GD-related product ions.

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Saini, Shivender Singh, and Anupreet Kaur. "Nanoadsorbents for the Preconcentration of some Toxic Substances: A Minireview." International Letters of Chemistry, Physics and Astronomy 21 (November 2013): 22–35. http://dx.doi.org/10.18052/www.scipress.com/ilcpa.21.22.

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The development of new sorbents and their application in preconcentration methods for determination of trace analytes is subject of great interest. Sample pretreatment methods, such as separation/preconcentration prior to the determination of metal ions have developed rapidly due to the increasing need for accurate and precise measurements at extremely low levels of ions in diverse matrices. This review summarizes and discusses several analytical methods involving the preparation and use of new solid phase extractant. A literature survey of the last ten years offering a critical review of these new sorbents available for use in trace analyte enrichment is provided.

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45

Luo, Qinghuan. "Neutrinos from Relativistic Outflows of Fast Spinning Magnetars." Publications of the Astronomical Society of Australia 22, no. 2 (2005): 157–61. http://dx.doi.org/10.1071/as04069.

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AbstractPulsars may be born with a short rotation period of milliseconds with the magnetic field amplified through dynamo processes up to ∼1015–1016 G. Such millisecond magnetars spin down rapidly, emitting bursts of high-energy neutrinos and gamma rays. Specifically, acceleration of ions in both the polar gap (as in a normal pulsar) and the relativistic magnetar wind is considered. In both cases ions can be accelerated to ultra-high energies and these energetic ions can lead to production of high-energy neutrinos and gamma rays through interaction with thermal radiation from the hot neutron star or the heated inner boundary region of the stellar envelope as the result of the deposition of energy by the magnetar wind. The detectability of the neutrino flux by a kilometre-scale neutrino detector such as the planned IceCube neutrino observatory is discussed.

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46

Fleckenstein, Monika, Steffen Schmitz-Valckenberg, Christine Martens, Sebastian Kosanetzky, Christian K. Brinkmann, Gregory S. Hageman, and Frank G. Holz. "Fundus Autofluorescence and Spectral-Domain Optical Coherence Tomography Characteristics in a Rapidly Progressing Form of Geographic Atrophy." Investigative Opthalmology & Visual Science 52, no. 6 (May 31, 2011): 3761. http://dx.doi.org/10.1167/iovs.10-7021.

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Miossec, Chloé, Michal Hejduk, Rahul Pandey, Neville J. A. Coughlan, and Brianna R. Heazlewood. "Design and characterization of a cryogenic linear Paul ion trap for ion–neutral reaction studies." Review of Scientific Instruments 93, no. 3 (March 1, 2022): 033201. http://dx.doi.org/10.1063/5.0080458.

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Ultra-high vacuum conditions are ideal for the study of trapped ions. They offer an almost perturbation-free environment, where ions confined in traps can be studied for extended periods of time—facilitating precision measurements and allowing infrequent events to be observed. However, if one wishes to study processes involving molecular ions, it is important to consider the effect of blackbody radiation (BBR). The vast majority of molecular ions interact with BBR. At 300 K, state selection in trapped molecular ions can be rapidly lost (in a matter of seconds). To address this issue, and to maintain state selectivity in trapped molecular ions, a cryogenic ion trap chamber has been constructed and characterized. At the center of the apparatus is a linear Paul ion trap, where Coulomb crystals can be formed for ion–neutral reaction studies. Optical access is provided, for lasers and for imaging of the crystals, alongside ion optics and a flight tube for recording time-of-flight mass spectra. The ion trap region, encased within two nested temperature stages, reaches temperatures below 9 K. To avoid vibrations from the cryocooler impeding laser cooling or imaging of the ions, vibration-damping elements are explicitly included. These components successfully inhibit the coupling of vibrations from the cold head to the ion trap—confirmed by accelerometer measurements and by the resolution of images recorded at the trap center (at 9 and 295 K). These results confirm that the cryogenic ion trap apparatus meets all requirements for studying ion–neutral reactions under cold, controlled conditions.

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Saitoh, Norizoh, Toshiyuki Nomura, and Yasuhiro Konishi. "Microbial Recycling of Precious and Rare Metals Sourced from Post-Consumer Products." Solid State Phenomena 262 (August 2017): 563–67. http://dx.doi.org/10.4028/www.scientific.net/ssp.262.563.

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We have focused on the metal-reducing bacterium, Shewanella algae that are able to reduce and deposit platinum group metals (Pt (IV), Pd (II) and Rh (III)) and gold (Au (III)) in neutral solutions at room temperature under anaerobic conditions. When processing the aqua regia solution of spent automotive catalysts, the solution pH was adjusted to the optimal range for S. algae activity between pH 4 and 7. After this pH adjustment, the S. algae cells were able to rapidly and selectively reduce and accumulate the platinum group metal ions from the leaching solution into the bacterial cells as metallic nanoparticles. The biotechnological procedure also has the potential to allow the recovery of Au (III) ions from the leaching solution of electronic waste. We also found that the S. algae cells were also applicable to the adsorption of rare metal ions from acidic solutions. We achieved selective adsorption of indium (In (III)) ions on the bacterial cells from the leaching solution of waste liquid crystal displays by adjusting its pH, because the pH range necessary for S. algae to act as an effective adsorbent differs for different metal ions. Our proposed microbial methods enable the rapid and highly efficient recovery of precious and rare metals sourced from post-consumer products.

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Iwahashi, H., T. Ishii, R. Sugata, and R. Kido. "Superoxide dismutase enhances the formation of hydroxyl radicals in the reaction of 3-hydroxyanthranilic acid with molecular oxygen." Biochemical Journal 251, no. 3 (May 1, 1988): 893–99. http://dx.doi.org/10.1042/bj2510893.

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Superoxide dismutase (SOD) enhanced the formation of hydroxyl radicals, which were detected by using the e.s.r. spin-trapping technique, in a reaction mixture containing 3-hydroxyanthranilic acid (or p-aminophenol), Fe3+ ions, EDTA and potassium phosphate buffer, pH 7.4. The hydroxyl-radical formation enhanced by SOD was inhibited by catalase and desferrioxamine, and stimulated by EDTA and diethylenetriaminepenta-acetic acid, suggesting that both hydrogen peroxide and iron ions participate in the reaction. The hydroxyl-radical formation enhanced by SOD may be considered to proceed via the following steps. First, 3-hydroxyanthranilic acid is spontaneously auto-oxidized in a process that requires molecular oxygen and yields superoxide anions and anthranilyl radicals. This reaction seems to be reversible. Secondly, the superoxide anions formed in the first step are dismuted by SOD to generate hydrogen peroxide and molecular oxygen, and hence the equilibrium in the first step is displaced in favour of the formation of superoxide anions. Thirdly, hydroxyl radicals are generated from hydrogen peroxide through the Fenton reaction. In this Fenton reaction Fe2+ ions are available since Fe3+ ions are readily reduced by 3-hydroxyanthranilic acid. The superoxide anions do not seem to participate in the reduction of Fe3+ ions, since superoxide anions are rapidly dismuted by SOD present in the reaction mixture.

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Bhowmick, Rahul, Abu Saleh Musha Islam, Urmila Saha, Gopinatha Suresh Kumar, and Mahammad Ali. "Rhodamine based turn-on chemosensor for Fe3+ in aqueous medium and interactions of its Fe3+ complex with DNA." New Journal of Chemistry 42, no. 5 (2018): 3435–43. http://dx.doi.org/10.1039/c7nj04505k.

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A novel di-coordinating rhodamine-based chemosensor, HL with NO donor atoms, selectively and rapidly recognizes Fe³⁺ in the presence of all biologically relevant as well as toxic metal ions and numerous anions and also with other reactive oxygen and nitrogen species.

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