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ion-selective electrode

Vladimir Kodzhahinchev, Andrew Biancolin, Carol Bucking
An in vitro gut-sac technique and the scanning ion-selective electrode technique (SIET) were used to characterize Mg2+, Ca2+, and H+ transport at both the mucosal and serosal surfaces of non-everted and everted gastrointestinal tissues obtained from Carassius auratus. As part of the study, two magnesium ionophores were compared (II vs. VI). Unfed animals displayed uniform transport of all ions along the intestine. Feeding resulted in elevated Mg2+ and Ca2+ transport when the gut lumen contained chyme however, under symmetrical conditions this increased transport rate was absent...
2018: PloS One
Lígia S Bueno, Rafael S Menezes, Ana Paula R Magalhães, Maria Fidela L Navarro, Renata C Pascotto, Marília A R Buzalaf, Sharanbir K Sidhu, John W Nicholson, Ana Flávia S Borges
OBJECTIVE: The aim of this study was to determine whether there is a correlation between acid erosion and fluoride release of conventional glass ionomer cements. METHODS: Ten specimens for each material were prepared for fluoride release tests and five for acid erosion tests separately. After placed in pH cycling solution, concentration of fluoride was measured by a fluoride-ion selective electrode each day for 15 days. For the acid erosion test, specimens were immersed in a lactic acid solution and their depth measured with a spring-loaded dial gauge...
November 29, 2018: Dental Materials: Official Publication of the Academy of Dental Materials
Le Yue, Fei Lian, Yang Han, Qiongli Bao, Zhengyu Wang, Baoshan Xing
The interaction between biochar nanoparticles (nano-BC) and plant roots in the rhizosphere is largely unknown, although it is crucial for understanding the role of BC in plant growth and bioavailability of pollutants. The effect of nano-BC produced at a series of temperatures (300-600 °C) on alleviating the phytotoxicity of Cd2+ to rice plants was investigated from the aspects of biochemical changes and Cd uptake in this study. The kinetics of Cd2+ fluxes in different root zones in the presence of nano-BC were also measured using a scanning ion-selective electrode technique...
November 26, 2018: Science of the Total Environment
S Menk, P Bertier, Y Enomoto, T Masunaga, T Majima, Y Nakano, T Azuma
A new cryogenic linear ion trap beamline has been constructed and commissioned, which serves to inject cold molecular and cluster ions into the RIKEN cryogenic electrostatic ring (RICE). Ions are created with an electrospray ion source, and a quadrupole mass filter is used for mass-selection prior to trap injection. The radio frequency octupole ion trap can be continuously loaded with ions and features a fast ion extraction mode to create short ion bunches with tens of μ s duration. We report here on the simulations and development of the ion trap beamline and validate performance with the moderately heavy molecular cation methylene blue...
November 2018: Review of Scientific Instruments
Chien-Hung Wu, Kow-Ming Chang, Yi-Ming Chen, Yu-Xin Zhang, Chia-Yao Cheng
Amorphous oxide semiconductors (AOSs) are attracted much attention due to high mobility, low temperature deposition, flexible, transmission, and uniformity. The thin film transistors (TFTs) with a-IGZO thin film as active layer perform higher field-effect mobility (>10 cm²/V·S), larger Ion /Ioff ratio (106 ), smaller subthreshold swing and better stability against electrical stress. LaAlO₃/ZrO₂ is employed as gate electrode and gate dielectric layer for a-IGZO TFTs, under the premise that performance of a-IGZO TFTs without decreasing...
April 1, 2019: Journal of Nanoscience and Nanotechnology
Xingxing Wu, Shucheng Wu, Yingchun Li, Han Chen, Qunhui Yuan, Wei Gan
Lately, an "all-in-one" strategy via direct pyrolysis of protic salt has attracted great attention in the preparation of hetero-doped porous carbons due to its distinctive simplicity. However, protic salt derived carbons usually process large grain sizes thus hamper their applications. Herein, a protic salt derived N, S co-doped porous carbon (N, S-PC) with improved porosity was synthesized by nanocasting and carbonization of protic salt. In the nanocasting silica sphere was used as auxiliary template and an easily obtained protic salt ([pPDA][nHSO4 ]) was served as C, N and S sources...
January 10, 2019: Analytica Chimica Acta
Pingjing Wen, Xiaomin Wei, Guiqiang Liang, Yanfei Wang, Yiping Yang, Lilin Qin, Weiyi Pang, Guangqiu Qin, Hai Li, Yueming Jiang, Qijun Wu
Long-term occupational exposure to low level of fluoride can induce oxidative stress and apoptosis in many cells, including lymphocyte. However, the underlying mechanism remains unclear. Hence, this study was designed to explore the potential oxidative stress and apoptosis of long-term occupational exposure to low level of fluoride in aluminum smelter workers. A total of 120 aluminum smelter workers were recruited in control, low-, middle-, and high-fluoride exposure groups with 30 workers for each group. The peripheral blood samples were collected, centrifuged, and isolated to obtain serum and lymphocyte suspensions...
November 26, 2018: Environmental Science and Pollution Research International
Jingyu Liu, Fan Zhang, Andrew J Allen, Aaron C Johnston-Peck, John M Pettibone
Reported reaction kinetics of metal nanoparticles in natural and engineered systems commonly have used proxy measurements to infer chemical transformations, but extension of these methods to complex media has proven difficult. Here, we compare the sulfidation rate of AgNPs using two ion selective electrode (ISE)-based methods, which rely on either (i) direct measurement of free sulfide, or (ii) monitor the free Ag+ available in solution over time in the presence of sulfide species. Most experiments were carried out in moderately hard reconstituted water at pH 7 containing fulvic acid or humic acid, which represented a broad set of known interferences in ISE...
November 22, 2018: Nanoscale
Julio Bastos-Arrieta, Antonio Florido, Clara Pérez-Ràfols, Núria Serrano, Núria Fiol, Jordi Poch, Isabel Villaescusa
The chemical synthesis of silver nanoparticles (Ag-NPs) by using an environmentally friendly methodology for their preparation is presented. Thus, considering that plants possess components that can act as reducing agents and stabilizers in nanoparticles' production, the synthesis of Ag-NPs by using an extract aqueous solution of grape stalk waste as a reducing and capping agent is studied. First, the total polyphenols and reducing sugars contained in the produced extracts at different conditions are characterized...
November 17, 2018: Nanomaterials
Jun Pan, Shulin Chen, Qiang Fu, Yuanwei Sun, Yuchen Zhang, Na Lin, Peng Gao, Jian Yang, Yitai Qian
Sodium ion batteries are one of most promising alternatives to lithium ion batteries for large-scale energy storage, due to the high abundance and low cost of sodium in the earth. However, the lack of advanced electrode materials greatly affects their applications. Here, layered-structure SbPO4 is explored as an anode material for sodium ion batteries in terms of SbPO4 nanorods on reduced graphene oxide (SbPO4 /rGO). In situ transmission electron microscopy images reveal the preferential expansion along the transverse direction of the nanorods upon the first discharging, which arises from the reduction of SbPO4 to Sb and the subsequent alloying of Sb as supported by in situ X-ray diffraction and selected area electron diffraction patterns...
November 21, 2018: ACS Nano
Cristian Tunsu, Björn Wickman
Retrieval of mercury from aqueous streams has significant environmental and societal importance due to its very high toxicity and mobility. We present here a method to retrieve mercury from aqueous feeds via electrochemical alloy formation on thin platinum films. This application is a green and effective alternative to traditional chemical decontamination techniques. Under applied potential, mercury ions in solution form a stable PtHg4 alloy with platinum on the cathode. A 100 nanometres platinum film was fully converted to a 750 nanometres thick layer of PtHg4 ...
November 19, 2018: Nature Communications
Shereen A Boltia, Aya T Soudi, Eman S Elzanfaly, Hala E Zaazaa
Background : Traditional methods for Lomefloxacin hydrochloride (LOM) determination involve pretreatment steps, which extend analysis time and use hazardous chemicals. Objective : The ability to provide a rapid route without sample pretreatment for quantitative determination of compounds via a low-cost instrument is a challenging task. In this work, a simple potentiometric method was developed to determine the antibacterial LOM via in-house fabricated ion selective electrodes. Methods : Different sensors were fabricated using a poly vinyl chloride-based membrane, potassium tetrakis(4-chlorophenyl) borate as a cation exchanger, and 2-Nitrophenyl octyl ether as a plasticizer (sensor 1)...
November 16, 2018: Journal of AOAC International
K F Fang, B S Du, Q Zhang, Y Xing, Q Q Cao, L Qin
Boron (B) is essential for plant normal growth including pollen tube growth. B deficiency influences various physiological and metabolic processes of plants. However, the underlying mechanism of B deficiency in pollen tube growth is insufficiently understood. In the present research, the influence of B deficiency on apple (Malus domestica) pollen tube growth was studied and the possible regulatory mechanism was evaluated. Apple pollen grains were cultured under different concentrations of B. Scanning ion-selective electrode technique, fluorescent labeling and Fourier-transform infrared analysis (FTIR) were used to detect calcium ion flux, cytosolic Ca2+ concentration ([Ca2+ ]cyt), actin filaments and cell wall components of pollen tubes...
November 16, 2018: Plant Biology
Francesca Criscuolo, Irene Taurino, Sandro Carrara, Giovanni De Micheli
Lithium is the main drug for the treatment of mood disorders. Due to its narrow therapeutic window, Therapeutic Drug Monitoring (TDM) is a norm during therapy in order to avoid adverse effects. Consequently, patients are obliged to frequent check-ups in hospitals to determine their serum concentration and optimize accordingly the drug dose. Wearable sensors have attracted a growing interest in the research community in recent years owing to their promising impact in personalized healthcare. In particular, sweat diagnosis has seen an enormous expansion and is currently entering the market thanks to the large availability and simple collection of this fluid...
July 2018: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
Jina Ding, Yang Liu, Dongwei Zhang, Minglei Yu, Xuejia Zhan, Dan Zhang, Pei Zhou
This work describes an electrochemical aptasensor for determination of lead ions (Pb2+ ). Composites prepared from gold nanoparticles and polypyrrole (Au@PPy) with good electrical conductivity were used to modify the surface of a screen printed carbon electrode for amplifying the current signal. Single strand DNA was immobilized on the electrode and binds lead(II) as confirmed by cyclic voltammetry at voltage of -0.2 V~0.6 V. Differential pulse voltammetry, measured at 0.10 V (vs.  Ag/AgCl), was used to monitor the interaction between aptamer and lead(II) using hexacyanoferrate as an electrochemical probe...
November 13, 2018: Mikrochimica Acta
Junnan Hao, Tao Meng, Dong Shu, Xiaona Song, Honghong Cheng, Bo Li, Xiaoping Zhou, Fan Zhang, Zhibo Li, Chun He
Inspired by steaming bread, a novel three dimensional N and S co-doped reduced graphene oxide (3D NS-rGO) foam is fabricated via a gas foaming method similar to steaming bread procedure, in which (NH4 )2 S2 O3 is selected as the foaming agent as well as N and S source. Such cross-linked 3D structure not only has the high specific surface area also enable more transport channels for electrons/ions transport. Furthermore, introducing of N and S-containing functional groups creates lattice defects in graphene, which provides more active sites where the Faradaic pseudocapacitance occurs...
November 7, 2018: Journal of Colloid and Interface Science
L Y Yu, Y S Cui, H L Liu
Objective: To explore the effects of endoplasmic reticulum stress-induced apoptosis in thyroid injury of rats caused by excessive fluoride intake. Methods: All 40 Wistar rats were randomly divided into four groups, control group, low fluoride group, medium fluoride group and high fluoride group. The rats in control group were fed with tap water (fluoride concentratio n= 0.344 mg/L) and the experimental rats were fed with the water contaminated fluoride with the dose of 5, 10 and 20 mg/L. 10 rats (female: male=1∶1) in each group were sacrificed after 8 months of exposure through drinking water...
November 6, 2018: Zhonghua Yu Fang Yi Xue za Zhi [Chinese Journal of Preventive Medicine]
Jung-Gu Han, Koeun Kim, Yongwon Lee, Nam-Soon Choi
In conjunction with electrolyte additives used for tuning the interfacial structures of electrodes, functional materials that eliminate or deactivate reactive substances generated by the degradation of LiPF6 -containing electrolytes in lithium-ion batteries offer a wide range of electrolyte formulation opportunities. Herein, the recent advancements in the development of: (i) scavengers with high selectivity and affinity toward unwanted species and (ii) promoters of ion-paired LiPF6 dissociation are highlighted, showing that the utilization of the above additives can effectively mitigate the problem of electrolyte instability that commonly results in battery performance degradation and lifetime shortening...
November 12, 2018: Advanced Materials
Fei Wu, Ping Yu, Lanqun Mao
Quantitative monitoring of brain neurochemistry is aimed at an accurate measurement of chemical basal levels and dynamics defining neuronal activities. Analytical tools must be endowed with high selectivity, sensitivity, and spatiotemporal resolution to tackle this task. On one hand, in vivo electroanalysis combined with miniature electrodes has evolved into a minimally invasive method for probing transient events during neural communication and metabolism. On the other hand, noninvasive imaging techniques have been widely adopted in visualizing the neural structure and processes within a population of neurons in two or three dimensions...
October 31, 2018: ACS Omega
Xiao Su, Akihiro Kushima, Cameron Halliday, Jian Zhou, Ju Li, T Alan Hatton
The removal of highly toxic, ultra-dilute contaminants of concern has been a primary challenge for clean water technologies. Chromium and arsenic are among the most prevalent heavy metal pollutants in urban and agricultural waters, with current separation processes having severe limitations due to lack of molecular selectivity. Here, we report redox-active metallopolymer electrodes for the selective electrochemical removal of chromium and arsenic. An uptake greater than 100 mg Cr/g adsorbent can be achieved electrochemically, with a 99% reversible working capacity, with the bound chromium ions released in the less harmful trivalent form...
November 8, 2018: Nature Communications
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