Carbon-based nanocatalyst: An efficient and recyclable heterogeneous catalyst for one-pot synthesis of gem-bisamides,hexahydroacridine-1,8-diones and 1,8-dioxo-octahydroxanthenes

Journal of the Iranian Chemical Society - In this abstract, we discuss the progress related to sulfonated carbon-based materials in various acid-catalyzed organic transformations which are then...     

Numerical solutions for blood flow in elastic vessels

We consider the differential–algebraic system for the blood flow and pressure in the systemic arteries. By the operator splitting method, we transform the system into the hyperbolic one, introduce the bicharacteristics, and perform the time–space nonuniform discretization, obtaining the innovative difference scheme. Our results are illustrated with numerical experiments.     

Protective Effects of a Strawberry Ellagitannin-Rich Extract against Pro-Oxidative and Pro-Inflammatory Dysfunctions Induced by a High-Fat Diet in a Rat Model

Due to the demonstrated intestinal microbial transformation of strawberry ellagitannins (ET) into bioactive metabolites, in the current study on rats, we hypothesised that the dietary addition of a strawberry ET-rich extract (S-ET) to a high-fat diet (HFD) would attenuate disturbances in the redox and lipid status as well as in the inflammatory response. We randomly distributed 48 Wistar rats into six groups and used two-way analysis of variance (ANOVA) to assess the effects of two main factors—diet type (standard and high-fat) and ET dosage (without, low, and 3× higher)—applied to rats for 4 weeks. In relation to the hypothesis, irrespective of the dosage, the dietary application of ET resulted in the desired attenuating effects in rats fed a HFD as manifested by decreased body weight gain, relative mass of the epididymal pad, hepatic fat, oxidized glutathione (GSSG), triglycerides (TG), total cholesterol (TC), and thiobarbituric acid-reactive substances (TBARS) concentrations as well as desired modifications in the blood plasma parameters. These beneficial changes were enhanced by the high dietary addition of ET, which was associated with considerably higher concentrations of ET metabolites in the urine and plasma of rats. The results indicated that S-ET could be effectively used for the prevention and treatment of metabolic disturbances associated with obesity, dyslipidaemia, redox status imbalance, and inflammation.     

Fabrication and characterization of adenine-grafted carbon-modified amorphous ZnO with enhanced catalytic activity

Sustainability has become a countersign and guiding rule for current field of nanocatalysis. Herein, we report a cost-effective, greener, clean, and proficient process for the formation of adenine-grafted carbon-modified amorphous ZnO nanocatalyst (ZnO@AC) derived from garment industry waste (waste cotton cloth). Due to adenine functionality, catalyst provides consistent dispersion of ZnO providing catalytically active sites for the synthesis of pyrano[2,3-d]pyrimidines and bis(pyrazol-5-ole) and alters the electron–hole pair recombination without notable mass-transfer limitation. The photocatalytic evaluation of ZnO@AC was performed on methyl orange (MO) dye under UV light and 87.3% degradation efficiency resulted in 75 min. Moreover, the catalyst was recyclable and could be reused up to eight runs, making it more sustainable. The morphology of ZnO@AC remained intact with the slight agglomeration of ZnO nanoparticles (nps) after eight recoveries according to the transmission electron microscopy (TEM) image of the used catalyst.     

Facile synthesis of novel amino acid-like building blocks by N-alkylation of heterocyclic carboxylates with N-Boc-3-iodoazetidine

Molecular Diversity - An efficient protocol providing easy access to highly functionalized heterocyclic compounds as novel organic building blocks was developed by coupling alkyl pyrazole-,...     

Long-Lived Circularly Polarized Phosphorescence in Helicene-NHC Rhenium(I) Complexes: The Influence of Helicene,Halogen, and Stereochemistry on Emission Properties

The first enantiopure chiral-at-rhenium complexes of the form fac-ReX(CO)₃(:C^N) have been prepared, where :C^N is a helicene-N-heterocyclic carbene (NHC) ligand and X=Cl or I. These have complexes show strong changes in the emission characteristics, notably strongly enhanced phosphorescence lifetimes (reaching 0.7 ms) and increased circularly polarized emission (CPL) activity, as compared to their parent chiral models lacking the helicene unit. The halogen along with its position within the dissymmetric stereochemical environment strongly affect the photophysics of the complexes, particularly the phosphorescence quantum yield and lifetime. These results give fresh insight into fine tuning of photophysical and chiroptical properties of Re-NHC systems.     

Estimation of seasonal correction factor for indoor radon concentration in Slovakia: a preliminary survey

Journal of Radioanalytical and Nuclear Chemistry - In this study, 56 rooms were monitored throughout the year in four stages based on 3-month indoor radon measurements. The first seasonal...     

Functionalization of parylene during its chemical vapor deposition

Two possible mechanisms for the reaction of four halogenated (metha)acrylate‐based molecules with Parylene [poly (paraxylylene)] during its chemical vapor deposition were proposed. The chemical reactivity of acrylate double bond with the paraxylylene biradical was calculated for all four (metha)acrylate‐based molecules. These calculations allowed the evaluation of the energetically favorable mechanism and indeed a direct correlation was found between both predicted and experimental reactivities. Next, the reactivity of the (metha)acrylate‐modified Parylene films was evaluated through their reaction with different amines. The obtained amidated Parylene films were characterized with X‐ray photoelectron spectroscopy, Kaiser test for primary amines, and fluorescence microscopy. The strong reactivity of (metha)acrylate‐modified Parylene films toward nucleophilic substitution emphasizes a general method for the functionalization of self‐supported Parylene films grown on the reacting solutions using the novel solid on liquid deposition process. This paves the way to the development of multifunctional materials in a one‐step process resulting from the deposition Parylene over liquid patterns. © 2011 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem, 2011     

Existence and stability of oscillating solutions for a class of delay differential equations

In this paper we study a Hopf bifurcation for a general class of simple delay differential equations with a term that can describe a treatment. Conditions guaranteeing appearance of the Hopf bifurcation as well as stability of arising periodic orbits are proved. Applications of proved theorems to a general version of the logistic equation are presented.