Iranian Journal of Chemistry and Chemical Engineering
Volume:12 Issue: 2, Nov-Dec 1993

Laser Raman spectroscopy has been employed to investigate the effects of cyclosporin-A on the order and dynamics of DPPC (Dipalmytoyl Phosphatidyl Choline) model membrane system. It is shown that the addition of small amount of cyclosporin-A to a DPPC dispersion disturb the system and changes the order / disorder parameter of the model membrane.

The synthesis of SmCl3(THF)3 from SmCl3. 6H2O is described. The reaction of SmCl3(THF)3 with NaBH4 in dry THF gave white microcrystalline tris (tetrahydroborato) tris (tetrahydrofuran) samarium (III), Sm(BH4)3(THF)3. The vibrational and magnetic properties of Sm(BH4)3(THF)3 have been studied.

Condensation of Glyoxal, Formaldehyde and anilines lead to the formation of 2,4,6,8-tetraphenyl and substituted phenyl 2,4,6,8-tetraazabicyclo [3.3.0] octanes. The reactions are sensitive to pH and temperature. Ortho derivatives of anilines do not participate in this condensation. X-Ray structural determination reveals a cis-dienvelope geometery about the two fused rings.

A new derivation of the quantum Boltzmann transport equation for the Fermion system from the quantum time evolution equation for the Wigner distribution funtion is presented. The method exhibits the origin of the time-irreversibility of the Moltzmann equation. In the present work, the spin dependent and indistinguishibility of particles are also considered.

Sulphide was determined spectrophotometrically at 628nm and pH 6.7 based on its catalytic redution of toluidine blue in the presence of Se(IV) using a flow injection system. After optimization of the measuring conditions the calibration curve was found linear up to 25mgmL-1 and the detection limit was 0.3 mgmL-1 (30 mL injections). The relative standard deviation for the determination of 10 mgmL-1 sulphide was 1.2% (n=14). The injection rate was 30h-1.

The 13C chemical shifts for a series of compounds which includes carboxylic acids, aldehydes, ethers, ketones and hydrocarbons were simulated by using the parametric techniques. The observed chemical shifts were related to numerically encoded structural parameters called descriptors. Two new electronic doscriptors were added to the previous descriptors. Ploting of experimental versus culated chemical shifts for 34 different carbons in the data set shows a standard deviation of 6.05 ppm and regession coefficient of 0.994.

Whey contains more than half of total solids present in the original milk, which includes 20% of the proteins, most of the lactose, mineral and water soluble vitamins. In this study, selective separation of whey components by Aphron flotation (separation of ultrafine particles by micro-bubbles) has been investigated. It has been shown that it is possible to recover valuable components of whey by flotation method instead of vaporization.

In order to increase the rate of gas absorption, chemical reaction in the liquid phase is considered. The purpose of this paper was to simulate gas absorption process by a liquid film over a spherical packing incorporating eddy viscosity and diffusivity. Second order chemical reaction for two different cases (fast and slow) were considered. The system of partial differential equations obtained was soled by the use of finite difference method. In this study absorption of CO2 by mono-ethanol amine (MEA) and methyl di-ethanol amine (MDEA) were considered, and velocity and concentration profiles in the liquid film were obtained. The simulation results revealed that, increasing of turbulence in the liquid film, increases the rate of gas absorption while decreases the thickness of the reaction zone.