نتایج جستجو برای: ag and pb2 cations

تعداد نتایج: 16836790  

Journal: :The Journal of General Physiology 1989
T H Müller D Swandulla H D Lux

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 fo...

2003
SERGEY V. KRIVOVICHEV PETER C. BURNS

The crystal structure of Pb4O(VO4)2 has been solved using crystals prepared by high-temperature solid-state reactions. The compound is orthorhombic, Pnma, a 22.7276(9), b 11.5346(4), c 7.4349(3) Å, V 1949.09(13) Å3, Z = 8. The structure was solved by direct methods and refined on the basis of F2 of all unique reflections to R1 = 0.029 (wR2 = 0.052), calculated for 3052 unique observed reflectio...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه رازی - دانشکده علوم 1389

fluorescence chemical sensors for the highly sensitive and selective determination of pb2+ , hg2+, co2+ and fe3+ ions in aqueous solutions are described. the ion sensing system was prepared by incorporating lipophilic ligand (l) as a neutral ion-selective fluoroionophore in the plasticized pvc membrane containing sodium tetraphenylborate or potasium tetrakis (p-chlorophenyl) borate as a liphoph...

Journal: :Journal of bioenergetics and biomembranes 2003
William D Atchison

Voltage-gated Ca2+ channels are targets of the number of naturally occurring toxins, therapeutic agents as well as environmental toxicants. Because of similarities of their chemical structure to Ca2+ in terms of hydrated ionic radius, electron orbital configuration, or other chemical properties, polyvalent cations from aluminum to zinc variously interact with multiple types of voltage-gated Ca2...

Journal: Pollution 2019

The present study synthesizes a novel adsorbent by coating Fe3O4 magnetic nanoparticles with amino functionalized mesoporous silica. The FTIR spectrums indicate that silica has been successfully coated on the surface of Fe3O4 and 3-aminopropyl tri methoxysilane compound have been grafted to the surface of silica-coated Fe3O4. The XRD analysis shows the presence of magnetite phase with cubic spi...

Journal: :Physical chemistry chemical physics : PCCP 2015
Qun Jing Zhihua Yang Shilie Pan Dongfeng Xue

Pb(II) cations have long been associated with lone-pairs which can help to enhance the optical anisotropic birefringence. In this paper, the contribution of lead cations to birefringence has been investigated using first-principles and real-space atom-cutting methods. The results show that the contribution of lead cations to birefringence is determined by the degree of stereochemical activity, ...

2014
Antonia Sola Arturo Espinosa Alberto Tárraga Pedro Molina

[m.n] Multinuclear ferrocenophanes prepared by aza-Wittig reaction of bisiminophosphoranes derived from 1,1'-diazidoferrocene and isophthaladelhyde or 2,5-diformylthiophene, behave as efficient electrochemical and chromogenic chemosensor molecules for Zn2+, Pb2+, and Hg2+ metal cations. Whereas the OSWV of receptor 3, bearing two m-phenylene units in the bridges, display one oxidation peak, rec...

Journal: :Analytical sciences : the international journal of the Japan Society for Analytical Chemistry 2001
M Shamsipur G Azimi M H Mashhadizadeh S S Madaeni

A facile supported liquid membrane (SLM) system for the selective and efficient transport of silver ion is introduced. The SLM used is a thin porous polyvinyldifluoride membrane impregnated with hexathia-18-crown-6 (HT18C6) dissolved in nitrophenyloctyl ether. HT18C6 acts as a specific carrier for the uphill transport of Ag+ ion as its picrate ion paired complex through the SLM. In the presence...

2013
Alexander V. Sienkiewicz Vladimir N. Kokozay

The lead(II) complexes of 2,2'-iminodiethanol (H2Dea)Pb2(Dea)(N03)2(DMF), Pb2(HDea)2Cl2 and [Pb2Br6](H3Dea)2(DM F = N,N-dimethylformamide) have been synthesized from the com­ ponents and characterized by X-ray crystallography. Both mono(HDea) and doubly (Dea) deprotonated HN (CH2CH2OH)2 are coordinated via oxygen and nitrogen atoms in Pb2(D ea)(N 03)2(DM F) and Pb2(HDea)2Cl2. The nitrate comple...

The present study synthesizes a novel adsorbent by coating Fe3O4 magnetic nanoparticles with amino functionalized mesoporous silica. The FTIR spectrums indicate that silica has been successfully coated on the surface of Fe3O4 and 3-aminopropyl tri methoxysilane compound have been grafted to the surface of silica-coated Fe3O4. The XRD analysis shows the presence of magnetite phase with cubic spi...

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