Modification of the Scaled Particle Theory for Solubility of Non-Polar Gases in Water

In this work based on the modified scaled particle theory (SPT), the solubility of non-polar gases (He, Ar, N₂, H₂, O₂, CO₂ and CH₄) in water has been studied over a wide range of temperatures. Calculations of Henry’s law constant by the SPT are related to the inherent physical properties and parameters of solvent and solute, all of which are considered temperature dependent. The temperature dependence of molar volume and hard sphere diameter of solvent and polarizability of solute have the most significant effects on the solubilities of gases in water. The average relative deviation is less than 3 %. Also, the effect of different mixing rules in the application of SPT to prediction of gas solubility has been studied.     

Nanomolar Determination of Methyldopa in the Presence of Large Amounts of Hydrochlorothiazide Using a Carbon Paste Electrode Modified with Graphene Oxide Nanosheets and 3‐(4′‐Amino‐3′‐hydroxy‐biphenyl‐4‐yl)‐acrylic Acid

A novel electrochemical sensor for sensitive detection of methyldopa at physiological pH was developed by the bulk modification of carbon paste electrode (CPE) with graphene oxide nanosheets and 3‐(4′‐amino‐3′‐hydroxy‐biphenyl‐4‐yl)‐acrylic acid (3,′AA). Applying square wave voltammetry (SWV), in phosphate buffer solution (PBS) of pH 7.0, the oxidation current increased linearly with two concentration intervals of methyldopa, one is 1.0×10^?8–1.0×10^?6 M and the other is 1.0×10^?6–4.5×10^?5 M. The detection limit (3σ) obtained by SWV was 9.0 nM. The modified electrode was successfully applied for simultaneous determination of methyldopa and hydrochlorothiazide. Finally, the proposed method was applied to the determination of methyldopa and hydrochlorothiazide in some real samples.     

One‐Pot Synthesis of Dialkyl 2‐(Alkyl or aryl)‐6‐(pyrimidin‐2‐ylthio)‐4‐thioxo‐5,6‐dihydro‐4H‐1,3‐oxazine‐5,6‐dicarboxylate Derivatives via a Four‐Component Reaction

A number of new dialkyl 2‐(alkyl or aryl)‐6‐(pyrimidin‐2‐ylthio)‐4‐thioxo‐5,6‐dihydro‐4H‐1,3‐oxazine‐5,6‐dicarboxylate have been prepared in good yield from the multicomponent reaction between 2‐mercaptopyrimidines and acetylenic diesters with acetyl or benzoyl isothiocyanate.     

Catalyst-Free,Efficient, and Facile Conversion of Epoxides to β-Hydroxy Thiocyanates Under Neutral Conditions

Epoxides are efficiently and easily converted to their corresponding β-hydroxy thiocyanates by NH₄SCN in refluxing acetonitrile in a regio- and chemoselective manner under neutral conditions without using a catalyst, in spite of the use of many different catalysts reported in the literature for this purpose.     

Kinetic Study of the Electro‐Catalytic Oxidation of Acetaldehyde on Copper Electrode

Electrocatalytic oxidation of acetaldehyde was investigated on a copper electrode in alkaline solution. The process of oxidation involved and its kinetics were established by using cyclic voltammetry and chronoamperometry techniques as well as steady state polarization measurements. It has been found that in the course of an anodic potential sweep the electro‐oxidation of acetaldehyde follows the formation of Cu(III) and is catalysed by this species through a mediated electron transfer mechanism. A mechanism based on the electrochemical generation of Cu(III) active sites and their subsequent consumption by the acetaldehyde in question was also investigated.     

The oak (Quercus brantii) acorn as a growth promotor for rainbow trout (Oncorhynchus mykiss): growth performance,body composition,liver enzymes activity and blood biochemical parameters

Abstract

Medicinal plants play an important role in aquaculture as feed additives. This study aimed to investigate effects of alcoholic extract of acorn on growth performance, body composition, digestive enzymes activity and blood biochemical parameters of rainbow trout (O. mykiss) as a commercially important fish. Five dietary treatments were supplemented: 100, 200, 400 and 600?mg.kg^?1 of the extract. Fishes were fed twice per day for 8?weeks, and results showed that acorn extract positively affected all investigated parameters in rainbow trout fishes. Digestive enzymes activity and growth performance were increased, while activity of liver enzymes and cortisol were lowed in comparison to control individuals. Body composition of treated animals was also enhanced. Comparison between treated groups together with integrative biomarker response (IBR) values indicated greatest effects in animals fed with 400 and 600?mg.kg^?1 of the extract. Positive effects of the acorn represent promising start point for further studies.