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Abstract : Modeling Nontraumatic Aneurysm Evolution, Growth and Rupture
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Abstract: We have presented a mathematical model to study the evolution, growth and risk rupture of nontraumatic aneurysms contained within a cylindrical region of blood vessels. Analytical and numerical solutions are studied. Results affirmed that the intra-aneurysmal pressure and bloodstream flow account for the evolution and growth of aneurysms, and we find that an aneurysm may rupture when the ratio of the lateral membrane contraction to longitudinal membrane extension approaches one. Numerical properties of intra-aneurysmal pressure, impact fluid velocity, membrane displacement and the deformed radius with respect to the Poisson ratio, membrane thickness and extensional rigidity are studied. The importance of the findings is rested on the fact that they can be used to improve noninvasive means for predicting aneurysm rupture, and treatment and management decisions after rupture. Keywords: Elastodynamics, Filtration, Navier-Stokes, Numerical Solutions, Permeability, Poisson Ratio, Aneurysm.Download Full Article |
Abstract : Assessment of Floristic, Microbial Composition and Growth of Sphenostylis stenocarpa (Hochst Ex A. Rich) in Soil from Two Dumpsites in Benin City, Nigeria
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Abstract: Survey of dumpsite plant composition, assessment of rhizosphere microorganisms and growth performance of Sphenostylis stenocarpa grown on two dumpsite (CAPITOL and NITEL ROAD) soils in Benin City was investigated. Control treatment was top soil. A total of 9 and 30 flora were observed at the CAPITOL and NITEL ROAD dumpsites respectively. Analysis of the rhizosphere soils of the plants grown in dumpsite soils at different amendments showed a total heterotrophic bacterial count ranging from 1.57 x 104 to 4.18 x 104cfu/g and a total heterotrophic fungal count in the various rhizosphere soils ranged from 5.05 x 103 to 1.68 x 104cfu/g. The bacterial isolates from the rhizosphere soil samples were Arthrobacter sp., Bacillus sp, Pseudomonas sp., Escherichia coli, Enterobacter sp., Klebsiella sp., Micrococcus sp. and Staphylococcus sp. The fungal isolates were Aspergillus sp, Mucor sp, Fusarium sp, Penicillium sp, Trichoderma sp. and Saccharomyces sp. Bacillus sp., Pseudomonas sp., Penicillium sp. and Aspergillus sp. Aspergillus sp. 100 % (present in all dumpsite soils analyzed) had the highest frequency of occurrence amongst the isolates.Percentage seedling emergence was significantly reduced from 86.67± 13.33 % - 100.00 ± 0.00 % in control (top) soil to 60.00 ± 0.00 % to 93.33 ± 6.67 % in CAPITOL dumpsite soil. Shoot height at 6 weeks after planting (WAP) was significantly (p < 0.05) increased from 78.33± 18.53 cm in the control soil through 131.50 ± 18.79 cm in the CAPITOL dumpsite soil to 186.33 ± 13.68 cm in NITEL road dumpsite soil, all without amendment. Number of leaves at 6 WAP increased on addition of FYM in both soil types. Chlorophyll content was not significantly different (p > 0.05) from control plants. Leaf area in both dumpsite soils was found to be significantly different (p < 0.05) from the control soil but leaf area increased on addition and increase in amendment in both soil types. In all parameters observed, it was noted that the control treatment did better than the plants grown in the dumpsite soils with increased amendment.. Keywords: amendment, dumpsite soil, growth, Rhizosphere microorganisms, S. stenocarpa.Download Full Article |
Abstract : Seasonal and Spatial Growth Patterns of Shrimps Collected from Some Selected Creeks of Sindh, Pakistan
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Abstract: Shrimps are very important part of the export economy of Pakistan. They share about 60 % the total exports of the sea food. For the studies of shrimp health, the length-weight studies are critical for the evaluation of the shrimp stocks. In this paper an attempt has been made to explore the Length-weight relationships of the shrimps at the creeks zone of Sindh coast (the study area). Furthermore, the impacts of seasonal change on the growth of shrimps (length and weight treated as parameter) have been evaluated. The main objective of this study is to analyze the seasonal and spatial pattern of growth and condition of the selected shrimp species. For this purpose, three most abundant shrimp species Penaeus indicus, Metapenaeus affinis and Exopalaemon styliferus have been selected out of 30 found at the coastal creeks areas of Sindh, Pakistan from April 2013 to January 2014. Pre and Post-Monsoon seasonal changes were analyzed through Geographic Information Science (GIS) and universally accepted equation for LWRs logW = alogLb were applied on three species selected. It has been found that post-monsoon is the ideal period for shrimp catch for three species. LWRs (growth pattern) found stable in Penaeus indicus and Metapenaeus affinis while predicting an alarming deteriorated situation for Exopalaemon styliferus at creeks zone. Keywords: GIS, Length-Weight Relationships, Stock Assessment, Prawn Trawl, Creek environment, coefficient of correlation and coefficient of determination.Download Full Article |
Abstract : A Spatio-Temporal Assessment of Green Turtle Habitat at Hawkes Bay, Karachi through Geo-Informatics Techniques
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Abstract: Hawkes Bay site is one of the major favorable nesting sites for green turtles (Chelonia mydas) in Pakistan. Many environmental factors influence the nesting patterns of green turtles at this beach. The main objective of this study is to evaluate the importance of monitoring habitat of wildlife with the help of GIS and remote sensing. Seasonal influence on nesting pit density is quite noticeable on high resolution imageries. Pearson’s correlation coefficient analysis was used to highlight the strong relation of temperature and nesting pits. As a result of this research monitoring of spatio-temporal variation and impacts of temperature rise on nesting grounds observed. Keywords: Green turtle, Temperature, GIS Techniques, Satellite Imageries, Geographical Factors, Temporal Change and Risk Factors.Download Full Article |
