Iranian Journal of Chemistry and Chemical Engineering
Volume:8 Issue: 1, May-Jun 1989

The relationship between the binding of sodium n-dodecyl sulphate and protons to histone H1 has been investigated by equilibrium dialysis and titrimetry. The data cover the pH range 3.2-10 and surfactant concentrations up to 3.0×10-3 mol dm-3. A theoretical approach based on the binding potential concept of Wyman is presented and has been used to make estimates of the apparent Gibbs energies of sodium n-dodecyl sulphat binding to H1 equal 28 to 18 kj mol-1 for pH 3.2 to 10 respectively.

Two phase gas-liquid flow pattern in a horizontal pipeline is predicted very accurately using a newly-developed analytical relation. The pattern identification is bassed on one of the most widely used graphs, the Baker diagram, modified in a way that compensates for the unrealistic oversimplifications of recent works. The kerns method of pressure drop calculation is used to obtain the frictional pressure drop in a gas-liquid pipeline flow. An interactive computer program is developed for the prediction of the flow pattern and calculation of pressure drop.

The elements Fe, Cu, Mn, Zn, Cr, Ni, Pb, and Cd were determined in the meat and skin offish by Atomic Absorption spectroscopy (AAS). The fish were grown in treated wastewater, Zayanderood river, and fisheries of Falavarjan and Babolsar. Arsenic and mercury in the sample were analyzed by Inductively coupled plasma emission spectroscopy and cold vapor AAS, respectively. The concentration of the above metioned elements in the meat and skin of the fish grown in treated waste wastewater blow their permissible levels, whereas the fish from zayanderood river generally had higher levels, than the other fish, whereas concentration of Mn, Pb, and Ni were higher than their respective permissible amounts. The concentration of Mo and Co in all the fish were below detectable amount. The elements Fe, Cu, mn, and Zn in the treated wastewater are determined quantitavely, whereas the other elements were below the detectable amount.

For determining the absorbed dose of ionizing radiation in tissues, it is essential to have materials which behave like tissues. These kind of materials are usually called phantom. Up to now many different compounds like water, rubber, Perspex etc have been used. Unfortunately the practical use of each of them has had its own problems. Our suggested gelatin phantom is very similar to soft tissue from the point of effective atomic number, mass density and electron density. In comparison to the other phantoms, gelatin phantom is felexible and can be moulded easily in the shape of any body organ. The exact real absorbed dose can be used also for flattening the body curvatures for radiotherapy procedures. The preparation is quite easy and by adding some fungicide to it, and keeping it in a cold place it can be used for a long period of time.

Compounds I, II and III, were used as models resembling gear systems (bods connecting CR3 groups to the skeletal molecule are paralle) in surveying the potential energy surface for their internal rotation. The magnitude of the barriers calculated for averaging the nmr signals, placed these compound culated for averaging the nmr signals, placed compounds in the range of measurement accessible by dynamic nmr spectroscopy (which is currently being pursued).