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Connection of metallamacrocycles via dynamic covalent chemistry: a versatile method for the synthesis of molecular cages.
A modular approach for the synthesis of cage structures is described. Reactions of [(arene)RuCl(2)](2) [arene = p-cymene, 1,3,5-C(6)H(3)Me(3), 1,3,5-C(6)H(3)(i-Pr)(3)] with formyl-substituted 3-hydrox...Read More
Evaluation of RbCl and CrCl? as markers of Triatoma brasiliensis (Hemiptera: Reduviidae) nymphs: persistence and influence of Rb and Cr on triatomine biology.
In order to mark Triatoma brasiliensis, the vector of Chagas disease in Brazil, two chemical compounds, rubidium chloride (RbCl) and chromium chloride (CrCl?), were tested. First, 199 N2-N5 nymphs wer...Read More
Rb is a positron-emitting radionuclide widely used in nuclear cardiology. One great advantage is its availability through a generator loaded with Sr. Sr can be produced in a high energy cyclotron by i...Read More
The OmpF porin from the Escherichia coli outer membrane folds into a trimer of beta-barrels, each forming a wide aqueous pore allowing the passage of ions and small solutes. A long loop (L3) carrying ...Read More
Crystallization and heavy-atom derivatization of StHsp14.0, a small heat-shock protein from Sulfolobus tokodaii.
Small heat-shock proteins (sHsps) bind and stabilize proteins denatured by heat or other stresses in order to prevent unfavourable protein aggregation. StHsp14.0 is an sHsp found in the acidothermophi...Read More
Level of theory study of magnetic resonance parameters of chalcogen XY- (X, Y = O, S and Se) defects in alkali halides.
An extensive level of theory study is performed on diatomic chalcogen defects in alkali halide lattices by density functional theory methods. A variety of exchange correlation functionals and basis se...Read More
The acid-base properties of cassiterite (alpha-SnO2) surfaces at 10-50 degrees C were studied using potentiometric titrations of powder suspensions in aqueous NaCl and RbCl media. The proton sorption ...Read More
Analogs of MK-499 are differentially affected by a mutation in the S6 domain of the hERG K+ channel.
Drug-induced long QT syndrome has been principally ascribed to block of the cardiac hERG K(+) channel. Methanesulfonanilides, such as MK-499, E-4031 and dofetilide, are potent hERG antagonists that li...Read More
Synthesis and biodistribution of lipophilic and monocationic gallium radiopharmaceuticals derived from N,N'-bis(3-aminopropyl)-N,N'-dimethylethylenediamine: potential agents for PET myocardial imaging with 68Ga.
In locations that lack nearby cyclotron facilities for radionuclide production, generator-based (68)Ga radiopharmaceuticals might have clinical utility for positron emission tomography (PET) studies o...Read More
Relative contribution of AtHAK5 and AtAKT1 to K+ uptake in the high-affinity range of concentrations.
The relative contribution of the high-affinity K(+) transporter AtHAK5 and the inward rectifier K(+) channel AtAKT1 to K(+) uptake in the high-affinity range of concentrations was studied in Arabidops...Read More
The physiological role of Candida albicans Cnh1, a member of the Na+/H+ antiporter family, was characterized. Though CaCnh1p had broad substrate specificity and mediated efflux of at least four alkali...Read More
Rubidium chloride tolerant callus cultures of rice (Oryza sativa L.) accumulate more potassium and cross tolerate to other salts.
Callus cultures from salt tolerant (CSR-10) and susceptible (Swarnadhan) varieties of Oryza sativa L. were established in Murashige and Skoog's (MS) medium containing lethal concentrations (50 mM...Read More
Determination of traces of rubidium in high purity cesium chloride by electrothermal atomic absorption spectrometry (ETAAS) using boric acid as a modifier
The use of boric acid as a modifier for the determination of trace amount of rubidium in high purity cesium chloride matrix by electrothermal atomic absorption is described. It was found that the nega...Read More
The yeast potassium transporter TRK2 is able to substitute for TRK1 in its biological function under low K and low pH conditions.
In S. cerevisiae, K+ transport relies principally on two structurally related membrane proteins, known as Trk1p and Trk2p. Direct involvement in cation movements has been demonstrated for Trk1p, which...Read More
Activity coefficients and thermodynamic parameters for RbCl/CsCl+amide (acetamide, propanamide, and n-butanamide)+water system at 298.15 K
Electromotive force (emf) of the chemical cell without liquid-junction K-ISE | RbCl/CsCl ( m"E) | ISE-Cl and K-ISE | RbCl/CsCl (m"E), amide (m"N) | ISE-Cl, have been measured at 298.15 ...Read More
Linopirdine was developed as a cognitive enhancing molecule and demonstrated to specifically block the potassium current generated by the brain specific KCNQ2-KCNQ3 proteins (M-channel). In this study...Read More
Structure of gramicidin D-RbCl complex at atomic resolution from low-temperature synchrotron data: interactions of double-stranded gramicidin channel contents and cations with channel wall.
Gramicidin D (gD) is a naturally occurring ionophoric antibiotic that forms membrane channels specific for monovalent cations. The crystal structure of the RbCl complex of gD has been determined at 1....Read More
Efficiency of rubidium marking in Aedes albopictus (Diptera: Culicidae): preliminary evaluation on persistence of egg labeling, survival, and fecundity of marked female.
Rubidium chloride (RbCl) has been used for the study of vector biology and behavior, although the efficacy of marking, egg production, and survivorship of marked females have been poorly studied. Four...Read More
Early reperfusion levels of Na^+ and Ca^2^+ are strongly associated with postischemic functional recovery but are disassociated from K"A"T"P channel-induced cardioprotection
We previously demonstrated that pinacidil does not affect Na"i^+ accumulation, cellular energy depletion, or acidosis during myocardial ischemia, but dramatically improves the cationic/energetic ...Read More
Three models for the biodistribution and dosimetry of 82Rb-chloride were reviewed and a proposal is made for the best dosimetry for this agent to be adopted. Data from three proposed biokinetic models...Read More
Altered electrolyte handling of the choroid plexus in rats with glycerol-induced acute renal failure.
The altered electrolyte handling of the choroid plexus was investigated in rats with acute renal failure (ARF) using lithium and rubidium as surrogate markers for sodium and potassium, respectively. F...Read More
We report the crystal structure of the nonselective cation channel NaK from Bacillus cereus at a resolution of 1.6 A. The structure reveals the intracellular gate in an open state, as opposed to the c...Read More
A study of mechanisms responsible for incorporation of cesium and radiocesium into fruitbodies of king oyster mushroom (Pleurotus eryngii)
Ex vitro cultures of Pleurotus eryngii were carried out under controlled conditions using sterile medium composed of barley seeds. The influence of alkali and alkaline earth element salts (CsCl, KCl, ...Read More
Anomalous small angle x-ray scattering determination of ion distribution around a polyelectrolyte biopolymer in salt solution.
The distribution of counterions in solutions of high molecular mass hyaluronic acid, in near-physiological conditions where mono- and divalent ions are simultaneously present, is studied by small angl...Read More
Thermodynamics of the interaction of RbCl with some monosaccharides (d-glucose, d-galactose, d-xylose, and d-arabinose) in aqueous solutions at 298.15K
We're sorry this abstract is currently not available....Read More
Molecular origin of the cation selectivity in OmpF porin: single channel conductances vs. free energy calculation.
Ion current through single outer membrane protein F (OmpF) trimers was recorded and compared to molecular dynamics simulation. Unidirectional insertion was revealed from the asymmetry in channel condu...Read More