Stenosis and Aneurysm of Coronary Arteries in A Patient with Behcet’s Disease

Coronary artery disease is extremely rare in patients with Behçet’s disease. We report the case of a patient with a history of Behçet’s disease who was admitted in our hospital with instable angina pectoris. The patient’s electrocardiogram was normal. Coronary angiography revealed aneurysm of the distal right coronary artery with a tight stenosis of the proximal part of the posterolateral branch. These two conditions were initially treated with immunosuppressive treatment. Three years later coronary angiography showed a total occlusion of the right coronary artery treated with medical therapy. More than fourteen cases of coronary involvement were reported in the literature but the etiopathogeny and the treatment are yet unknow

Computational Identification and Analysis of the Key Biosorbent Characteristics for the Biosorption Process of Reactive Black 5 onto Fungal Biomass

The performances of nine biosorbents derived from dead fungal biomass were investigated for their ability to remove Reactive Black 5 from aqueous solution. The biosorption data for removal of Reactive Black 5 were readily modeled using the Langmuir adsorption isotherm. Kinetic analysis based on both pseudo-second-order and Weber-Morris models indicated intraparticle diffusion was the rate limiting step for biosorption of Reactive Black 5 on to the biosorbents. Sorption capacities of the biosorbents were not correlated with the initial biosorption rates. Sensitivity analysis of the factors affecting biosorption examined by an artificial neural network model showed that pH was the most important parameter, explaining 22%, followed by nitrogen content of biosorbents (16%), initial dye concentration (15%) and carbon content of biosorbents (10%). The biosorption capacities were not proportional to surface areas of the sorbents, but were instead influenced by their chemical element composition. The main functional groups contributing to dye sorption were amine, carboxylic, and alcohol moieties. The data further suggest that differences in carbon and nitrogen contents of biosorbents may be used as a selection index for identifying effective biosorbents from dead fungal biomass

Thermodynamics of stability constant of binary complex of nicotinamide with Mn++

The stability constants of the binary complexes of Mn2+ with nicotinamide (NA) were determined from potentiometric pH titrations data at 15.0, 25.0 and 35.0degreesC and I = 0.1,0.2,0.4 mol L-1 (NaClO4). The formation of binary 1: 1, 1:2 NA-Mn complexes at three different temperatures and the influence of three different ionic strength on their stability were reported. The thermodynamic parameters (DeltaG(f)degrees, DeltaS(f)degrees, DeltaH(f)degrees) for the complex formation reaction were estimated from stability constant at different temperatures

Adsorption of 4,4'-iso propylidene diphenol and diphenylolpropane 4,4' dioxyaceticacid from aqueous solution on kaolinite.

The adsorption of 4,4' - iso propylidene diphenol (Bis-phenol A) and diphenylolpropane 4,4' dioxyaceticacid (Bis acid A2) on kaolinite type clay have been studied as the function of their solution concentration and temperature. The adsorption rates at low concentrations of Bis - phenol A was found to fit the first-order equation with two kinetic steps. In all cases, the first step of adsorption was more rapid than the second one. The results indicated that the adsorption rate is controlled by either a film diffusion or a intra-particle diffusion. It can be concluded that the adsorption reaction begins with the film diffusion. Since the film-diffusion rate is much higher than the rate of intra-particle diffusion, the reaction is governed by intra-particle diffusion in the second step. In the case of Bis acid A2 only one kinetic step was observed corresponding to the film diffusion mechanism. Using the Arrhenius equation, the activation energies for both systems were evaluated. The corresponding values of thermodynamic parameters were calculated using Eyring's equation of absolute reaction rate. The adsorption data of Bis - phenol A and Bis acid A2 were fitted to Freundlich and B.E.T isotherms, respectively. The results could be interpreted in terms of a parallel orientation of Bis acid A2 molecules on the adsorbent surface

Adsorption of aqueous nitrophenols on clinoptilolite

The adsorption of o-, m- and p-nitrophenols on clinoptilolite type natural zeolite has been studied as a function of the solution concentration and temperature. The adsorption rates were observed to be equal to the first-order kinetics. The rate constants were calculated for 25.0-40.0-50.0 degreesC at constant concentration. The activation energies, (E-a) for nitrophenoles adsorption on zeolite, were estimated using the Arrhenius equation. Thermodynamic parameters were calculated for all nitrophenols. Adsorption isotherms of o-, m- and p-nitrophenols on natural zeolite were determined. These isotherms were modeled according to the Freundlich and Langmuir adsorption isotherms. The isotherms for nitrophenols on clinoptilolite were assigned as L curves. The L curve of p-nitrophenol is two step while the L curves of o- and m-nitrophenols are one-step. (C) 2001 Elsevier Science B.V. All rights reserved

Adsorption of congo red from aqueous solution using various TiO2 nanoparticles

In this work, TiO2 nanopowder (TIP600) was prepared by a sol-gel method and titanium isopropoxide, glacial acetic acid, and deionized water were used as the starting materials. Adsorption of congo red (CR) on Degussa-P25 (P25), commercial TiO2 (C-TiO2), and TIP600 was investigated. But, photochemical and photocatalytic event were not used for this adsorption process. Adsorption of CR onto the adsorbents was studied at different temperatures (25.0, 40.0, and 50.0 degrees C) and various adsorbent doses (0.1, 0.05, and 0.025g). The kinetics of dye adsorption has been investigated in terms of pseudo-first order, pseudo-second order, and intra-particle diffusion rate. The results indicate that pseudo-second order plays a significant role in the adsorption mechanism. The adsorptive capacity of TIP600 is much higher than that of other adsorbents. The value of H-# was obtained as positive, therefore the nature of adsorption was found endothermic. Equilibrium isotherm of CR was fitted to the Freundlich and Langmuir models. The equilibrium data of adsorbate were found to best fit the Langmuir model. For CR, TIP-600 was demonstrated as the best adsorption capacity (q(max) 112mgg(-1))

Thermodynamics of binary and ternary complexes of 3-amino-1,2,4-triazole and amino acids with Ni(II) and Co(II) metal ions

The stability constants of the 1:1 binary complexes of Ni(II) and Co(II) with 3-amino-1,2,4-triazole (AT), leucine (Leu) and glutamic acid (Glu), and the 1:1:1 ternary complex of them and the protonation constants of the ligands were determined potentiometrically at a constant ionic strenoth of I = 0.10 mol L-1 (NaClO4) in aqueous Solutions at 15.0 and 25.0 degrees C. The thermodynamic parameters Delta G(f)(0), Delta H-f(0) and Delta S-f(0) are reported for the formation reactions of the complexes. The enthalpy changes of all the complexations were found to be negative but the entropy changes positive. While the driving force for the formation of the Ni(II), Co(II) - AT complexes is the enthalpy decrease, the driving force for the ternary complexes of AT is the entropy increase

Thermodynamics of binary and ternary complexes of ascorbic acid and creatinine with Ag(I)

The stability constants of the 1:1 binary complexes of Ag(l) with creatinine and ascorbic acid and their 1:1:1 ternary complex and the protonation constants of the ligands were determined potentiometrically at a constant ionic strength of I = 0. 10 mol L-1 (NaClO4) in aqueous solutions at 10.0, 15.0 25.0 and 35degreesC. The thermodynamic parameters DeltaG(f)(o), DeltaH(f)(o) and DeltaS(f)(o) are reported for the formation reactions of the complexes. The enthalpy changes of all complexations are found to be negative but entropy changes positive. The driving force for the formation of Ag(I) - creatinine and Ag (I) - creatinine - ascorbic acid complexes is the enthalpy decrease

Thermodynamics of binary and ternary complexes of ascorbic acid and creatinine with Ag(I)

The stability constants of the 1:1 binary complexes of Ag(l) with creatinine and ascorbic acid and their 1:1:1 ternary complex and the protonation constants of the ligands were determined potentiometrically at a constant ionic strength of I = 0. 10 mol L-1 (NaClO4) in aqueous solutions at 10.0, 15.0 25.0 and 35degreesC. The thermodynamic parameters DeltaG(f)(o), DeltaH(f)(o) and DeltaS(f)(o) are reported for the formation reactions of the complexes. The enthalpy changes of all complexations are found to be negative but entropy changes positive. The driving force for the formation of Ag(I) - creatinine and Ag (I) - creatinine - ascorbic acid complexes is the enthalpy decrease