SHAHID CHAMRAN UNIVERSITY JOURNAL OF SCIENCE
Year:2003 | Volume:NEW SERIES | Issue:11 (SECTION B)|Papers Count:7

The Hangam bauxite anomaly is located in southern Firouzabad region, Fars Province. This anomaly is developed along the boundary between Sarvak and IIam Formation. According to stratigraphical and sedimentological evidences a sedimentary hiatus has exposed Sarvak limestone to karst weathering, and a layer of argillaceous debris accumulated on its surface and were partly converted to bauxite. Then the bauxite horizon was preserved by deposition of Ham limestone. Microscopic studies of polished-thin sections illustrate to autogenic origin of the Hangam bauxite (Bardossy, 1982). In this study, in order to trace the precursor rock of the Hangam bauxite and mass change calculations during weathering and bauxitization processes, geochemistry of immobile elements are used. Plots of chemical data show that AI, Ti, Zr, Y, Th, Cr and V were immobile during the bauxitization process. Among these elements Ti and AI show the highest correlation coefficient and were used for mass change calculations. Furthermore as Ti02-AI2O, binary diagram shows only one linear trend for all bauxite layers and Sarvak composition plotted along this straight line, it can be concluded that Sarvak limestone is the precursor of Hangam bauxite. Mass change calculations point to net removal of Na, K, Mg and Si from system during bauxitization process. Immobile elements ratios trace the source of the Hangam bauxite to the underlying argillaceous limestone (Sarvak Formation). On the basis of volume change calculations, 113 meters of the Sarvak limestone were converted to Hangam bauxite horizon with about 29 meters thickness.

Exercise training, as an effective treatment for improvement of the function of cardiovascular system, and inhibition of hypertension, has been considered in sports medicine. The aim of this research was to investigate if the interval, sub maximal swimming could change the concentration of plasma ANP and regulate the blood pressure of hypertensive patients. To this end, 11 middle aged male patients participated in 28 sessions of selected swimming protocol. Then the effects of exercise training on some characteristics of experimental group were studied and compared with that of control group (N=9). The results indicated that after exercise training, the functional capacity and concentration of plasma ANP of experimental group were increased while their exercise heart rate and blood pressure were decreased. These findings indicate that swimming may improve the function of cardiovascular system of hypertensive patients, part of which might be related to the changes of plasma ANP concentration.

Both Asmari and Bangestan reservoir rocks have very complex fracture orientations. Such orientation patterns cause both oil ratio and internal pressure to be high in overall Gachsaran oil wells. The length of fractures in the reservoir rocks ranges from few centimeters to few meters in size.Variation of oil production from two different flanks of regional anticline suggests very complex fracture orientation patterns. Core analysis and mud logging information indicate macroscope fractures ranging from 2 to 5 meters in length. Some reports also indicate macroscopic fractures are common in Asmari formation and generally are formed by two different tectonic stresses. In the first stage, fractures formed by compressive forces and in the second stage by stimulation forces. Rock analysis indicates that Pabdeh, Gurpi and Ilam formations are very brittle and lateral fractures in Asmari and Bangestan reservoir formations are highly connected. As a result, gas injection in the Asmari formation will increase the pressure in the Bangestan reservoir rock.

The present study on shells of Persian Gulf coastline of Khouzestan Province is aimed to identify the type and their deposition site. The Khouzestan Province with its long shoreline which contains vast deposits of recent shells burreid partially by sediments coming from northern highlands. Based on various available maps, the present and ancient shorelines were identified and along these lines excavation started at selected sites. In the selected sites, shallow wells were excavated for about 1-1.5 meter depth. The sample analyses were carried out on micro and macroscopic levels and various. Gastropoda class such as Ceypracea Murex Natica, Voluta, Pelcypoda class such as Nucula, Oyster, Chama, Lima, Pecten and Skaphopoda debris identified. In order to delineate the coastline on the satellite images, the sample sites were introduced to image processing. Subsequently, software and a supervised classification were run over the entire area. The results indicate that the distribution of these shells in the study area are not uniform and do not follow distinct pattern which may be due to differential coastal retreats.

By employing scanning electron microscopy (SEM), atomic absorption spectroscopy (AAS), atomic emission spectroscopy (AES) and x-ray fluorescence (XRF), eighteen historical samples have been studied. The samples belong to the sasani period. The results are indicative of a profound decrease in alkali ions, itself a result of ion exchange with water. The composition of dispersed particles in samples are identified and discussed. As a result of employing botanical ash in glass production, in all samples the amount of Na2O is more than K2O. The samples were divided into two groups, based on the percentage of Si02 being less or more than 60%. In the first group, crusted surface and in the second, pit formations are observed. The reasons for such observations are explained. Finally, based on the results, some comments have been presented for the restoration and conservation of the historical glasses.

Monosialoganglioside GMI has been found to be abundant in various regions of the mammalian central nervous system. Numerous investigations have indicated the involvement of ganglioside in neurobiological events associated with adaptive with adaptive functions, neuronal plasticity and formation of memory. The present study investigates the effects of peripheral and central administration of GM1on learning and memory of 1.5 months old (young) or 8 month old (adult) rats tested in passive avoidance task, by shuttle box. Two parameteres, including age and injection type have been considered in this work. The injection was done both intraperitonealy (ip) and intracerebrovntricular (icv). The result indicates that the young rats received GMI (2mglkg ip) improved their retention after one month of training compare to those which received saline. But, the young rats which received GMI (100 nm/10 mlit icv) didn't improve their retention on the whole behavioral test. Also, the GMI administration had no effect on learning and memory of adult rats and no improved retention was observed in all of the sessions. In conclusion, treatment with GM1 intraperitonealy increases memory in young rats, and this suggests a possible action of GMI on the maturation of the central nervous system.