Iranian Institute of Research and Development in Chemical Industries (IRDCI)-ACECRIranian Journal of Chemistry and Chemical Engineering1021-99868119890601Interaction Studies of Sodium N-Dodecyl Sulphate and Protons to Nistone H1391226110.30492/ijcce.1989.12261ENA.A. Moosavi MovahediInstitute of Biochemistry & Biophysics, University of Tehran, P.O. Box 13145-1384 Tehran, I.R. IRANM GodarziHamedan Medical Science University, Department of Biochemistry, Hamedan, I.R. IRANJournal Article19890222<em>The relationship between the binding of sodium n-dodecyl sulphate and protons to histone H<sub>1</sub> 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<sup>-3</sup> mol dm<sup>-3</sup>. 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 binding of both protons and surfactant ions to the surfactant-histone H<sub>1</sub> complexes. The average Gibbs energies of sodium n-dodecyl sulphate binding to H<sub>1</sub> equal 28 to 18 kJ/mol for pH 3.2 to 10 respectively.</em>Iranian Institute of Research and Development in Chemical Industries (IRDCI)-ACECRIranian Journal of Chemistry and Chemical Engineering1021-99868119890601Flow Pattern Identification and Pressure Drop Calculation for Gas-Liquid Flow in a Horizontal Pipeline10191226210.30492/ijcce.1989.12262ENFathollah FarhadiPetoleum and Chemical Engineering Department, Sharif University of Technology, Tehran, I.R. IRANS. EliyassiOil industries Engineering & Construction Co., P.O. Box 188-16315 Tehran, I.R. IRANJournal Article19880530<em>Two phase gas-liquid flow pattern in a horizontal pipeline is predicted very accurately using a newly-developed analytical relation. The pattern identification is based 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 Kern's 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.</em>Iranian Institute of Research and Development in Chemical Industries (IRDCI)-ACECRIranian Journal of Chemistry and Chemical Engineering1021-99868119890601Quantitative and Qualitative Determination of Heavy and Toxic Elements in the Fish Grown in Treated Wastewater and Their Comparison with Other Fish21311226310.30492/ijcce.1989.12263ENM.R HadjmohammadiInstitute of Chemistry, University of Mazandaran, Babolsar, I.R. IRANS.H. GhaziaskariInstitute of Chemistry, University of Mazandaran, Babolsar, I.R. IRANJournal Article19880611<em>The elements Fe, Cu, Mn, Zn, Cr, Ni, Pb and Cd were determined in the meat and skin of fish by Atomic Absorption Spectroscopy (AAS). The fish were grown in treated wastewater, Zayanderood river, and fisheries of Flavarjan and Babolsar. Arsenic and mercury in the samples were analyzed by Inductively Coupled Plasma Emission Spectroscopy and Cold Vapor AAS, respectively. The concentration of the above mentioned elements in the meat and skin of missable 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 quantitatively, whereas the other elements were below the detectable amount.</em>Iranian Institute of Research and Development in Chemical Industries (IRDCI)-ACECRIranian Journal of Chemistry and Chemical Engineering1021-99868119890601Gelatin Phantom32361226410.30492/ijcce.1989.12264ENHossein GheraatiDepartment of Physics, Isfahan University, Isfahan, I.R. IRANJournal Article19881024<em>For determining the absorbed dose of ionizing radiation is tissues, it is essential to have materials which behave like tissues. These kinds 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 flexible and can be moulded easily in the shape of any body organ. The exact real absorbed dose can be measured in the depth of the body organ phantom. It 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 in a cold place it can be used for a long period of time.</em>Iranian Institute of Research and Development in Chemical Industries (IRDCI)-ACECRIranian Journal of Chemistry and Chemical Engineering1021-99868119890601Two Model Compounds to Investigate the Gear Effect: 2,3-Dialkyl-Bicyclo[2.2.1]-Heptane and 2,3-Dialkyl-Bicyclo[2.2.2]-Octane37401226510.30492/ijcce.1989.12265ENMehran GhiaciDepartment of Chemistry, Isfahan University of Technology, Isfahan, I.R. IRANJournal Article19880307<em>Compounds I, II and III, were used as models resembling gear systems (bods connecting CR<sub>3</sub> groups to the skeletal molecule are parallel) in surveying the potential energy surface for their internal rotation. The magnitude of the barriers calculated for averaging the NMR signals, placed these compounds in the range of measurement accessible by dynamic NMR spectroscopy (which is currently being pursued).</em>