JOURNAL OF SCIENCES (ISLAMIC AZAD UNIVERSITY)
Year:2001 | Volume:11 | Issue:39|Papers Count:8

The Concentration of Surfactant and organic co - solvent in the micellar mobile phase have significant effects on retention and selectivity in micellar Liquid chromatography (MLC). As a result the effects of concentration of sodium dodecyl sulfate (SDS) and isopropanol on retention and selectivity were evaluated simultaneously. The tridimensional curve of variation of selectivity with the concentrations of isopropanol and SDS for separation of phenylthiohydantion amino acids indicate that optimum concentration of isopropanol and SDS are 3% (V/V) and 0.015 M respectively. The effect of pH in mobile phase at the range of 3.14 - 6.26 showed an increase in selectivity at higher pH for separation of PTH - amino acids.

Preventive dental materials are designed to prevent disease or injury to the teeth and supporting tissues. One of the important above mentioned materials is flouridegels. The effectiveness of the flouride ion lowering the incidence of dental caries has been stabilished by numerous clinical studies. One method of accomplish topical application of flouride is by the use of acidulated phosphate flouride gel. (A.P.F) in trays. In this study the A.P.F subjected to chemical and physical analysis and main ingradient of A.P.F is defined as: NaF, phosphoric acid, hydroflouric acid. The bulk media of A.P.F is a natural thixotropic gel. In addition to chemical composition analysis extensive experiment conducted on charactrization of hydrogel inorderto control flow behavior on clinical application.

Plants of Solanaceae family have been of particular interest to man since past times, as medicinal herbs. Winter cherry (Physalis alkekengi) relating to this family has been proved to have biological effects on the female reproductive system. In order to study the probable effects of P. alkekengi on the male PG hormonal axis, we used the aqueous extract (1.5 dried fruit powder per ml) injected to male adult Balb/C mice. Intra peritonial injections of the extract were applied in all experiments in every other day doses of 7.5 g/kg and 9 g/kg for 3 weeks. After the last injection, serum samples were removed for hormonal assays (RIA). LH, FSH and Testosterone showed significant decreases in both treatments. It is suggested that water extract of P. alkekengi acts as LH and FSH Antagonists at the pitiutary level. Decreased LH has in turn prevented the secretion of testosteron. On the other hand the presence of steroid-like structures (Physalins) in the plant has probably interacted with testosteron biosynthesis. Analytical results (H-NMR and 13-C NMR) revealed the presense of Physalin F in the fruits of the plant.

The role of histamine as a neurotransmitter and neuromedulator in many actions of brain is known, but the function of histamine in learning and memory processes hasn’t been clarified. Therefore in this study, effects of i.c.v. microinjection of histamine, pyrilamine (the H1 Receptor antagonist) and cimetidine (the H2- Receptor antagonist) on consolidation of memory are investigated. For this purpose, a cannula is implanted in right lateral ventricle of adult male rats by stereotaxic apparatus. After training of animal by passive avoidance task, histamine (5,10,20 µg/rat), pyrilamine (10,20,50 µg/rat) and cimetidine (1,10,50 µg/rat) are injected into their lateral ventricle. After a 24 hr. period of time, the level of retention memory was measured. The results showed that histamine attenuated the level of consolidation memory and pyrilamine and cimetidine ameliorated it by dose - dependent manner. The ameliorating and impairing effects of these drugs are derived from interaction between histaminergic system with changes of Ach, noradrenalin and serotonine levels in the brain.

According to Nabavi division (1976), Shah Neshin area is a portion of Central Iran (Azarbaijan) which has been covered by Cenozoic deposits. So, Alpine evolutions created various structures in these deposits and our aim had been analysis of structural specifications. Therefore, structural map of Shah Neshin area (1:50000) provided by geological quadrangle map of Takab, Aeromagnetic Map of Shah in Dezh and field studies. Then, structural features described and structural elements were analysed. According to this, Shah Neshin area has Progressive deformation whose homogeneous strain is mostly pure shear. But, Continuation of regional Compress in direction of N25°E during recent several million years and the decrease of the ability of pure shear, caused simple shear to accompany with pure shear, too

In this work the synthesis and characterization of mononuclear complex of molybdenum (VI) with ethylenediamine- N, N´ -diacetic acid in solid state is described. The occurrence of Mo=O stretches at 860 (vs) and 895 cm-1 (s) in the 800-900 cm-1 region are characteristic of a trioxo molybdenum specie, [Mo03EDDA]2-- and no other frequencies concerning bridging O-MO-O bonds has been observed. The porton NMR, IR and Electronic absorption spectra of the complex are described.

1, 5 - Diphenylcarbazone was used as an excellent carrier for the efficient and specific transport of Cu (II) ions through a liquid membrane composed of chloroform. At the optimum pH of 7.0, more than 99% of total copper was transported over a period of two hours. The selectivity and efficiency of copper transport from aqueous solution containing mixtures of several different cations was investigated.

This paper presents an approach for linear multi-level programming problems (MLPP) based on fuzzy programming and multi objective programming. In fuzzy programming for linear MLPP, is recently developed by Lai (1996) and Shih et al. (1996), undesirable solutions are produced when determined fuzzy goals for objective functions and decision variables at the upper level are inconsistent. In our method, by considering the tolerances of upper levels decision variable and all objective functions as variable, a linear MLPP is formulated as a nonlinear multi-objective programming problem. Thus, without using fuzzy goals, the proposed approach will not increase the complexities of original problems and will solve a nonlinear MLPP in a single iteration. To demonstrate the concept, a numerical example is solved and its solution is compared with other classical methods.