Abstract:Some characteristics of a primitive polynomial, an irreducible polynomial and a reducible polynomial of monic quadratic polynomials with same coefficients are analyzed and compared in this paper. An application of a monic irreducible quadratic polynomial to a multiple recursive generator (MRG) is proposed. The adopted performance measures are the number of possible vectors of multipliers and the spectral test. For a primitive polynomial and an irreducible polynomial, we perform an exhaustive search for a second-order MRG with the objective of maximizing the spectral test performance. The results indicate that the difference of the number of possible vectors of multipliers can affect the performance of spectral test.
Abstract:In this paper experimental investigation on the mechanical properties of short randomly oriented Palmyra Palm Leaf Stalk Fiber [PPLSF] and Carbon Fiber Reinforced Polyester [CFRP] hybrid composite was carried out based on various weight percentages. The Hybrid composite were fabricated by resin transfer moulding or compression moulding technique. The tensile strength, flexural and impact properties of the composite were assessed. The fractured surface of the hybrid composite were analysed using Scanning Electron Microscopy [SEM]. Water absorption performance of the fabricated composite was also studied. Experimental results were compared with other composite which possesses high strength to weight ratio.
Abstract:The objective of the present study was to evaluate the prevalence and other epidemiological aspects of patients with Tetralogy of Fallot (T4F) who were being followed up in a tertiary referral hospital specialized in the identification and treatment of cardiopathies and pulmonary diseases in Fortaleza. This is a quantitative, transversal, exploratory and retrospective. The sample consisted of 108 patients with a medical diagnosis of the condition, who had undergone cardiac surgery and who had been followed up at said institution in the last 5 years. The study evidenced a prevalence of 11.3% of the diagnosis of Tetralogy, in which the majority were female 50.9%, of the ethnicity 39.8% (43/108), from the interior 55.6% (60 / 108), with married parents 39.8%, with full secondary education 33.3% and Catholic religion 54.6%. The surgical procedure performed in the first year of life was demonstrated in 50.0%, with drug therapy using two drugs by the majority 42.0% and outpatient follow-up in 41.7%. In this context, it is emphasized that surgical treatment should include reduction of complications in the long term and reduce the number of early and late surgeries, providing a better quality of life. It is believed that deepening the knowledge about the management of pediatric patients with T4F, requires a broad commitment and has a large space for new studies, since it is a specific area of cardiology of great relevance for the prognosis of these patients.
Abstract:In plants salt stress has pronounced effect on the growth, morphological and physiological parameters as well as bio-chemical process. Alternanthera bettzickiana is an ornamental erect herb. In this study morphological and physiological responses of A. bettzickiana were investigated adaptability potential of A. bettzickiana to salt tolerance. Salinity was examined at 5, 10, 15, 20, 25 and 30 dS/mM NaCl for 30 days. Statistical analysis of variance elucidates the highly significant results on A. bettzickiana under salt stress. Maximum growth observed at lowest salinity level having 5 dS/m and least at highest salinity level 30dS/m in all morphological characters of the plant. Increasing levels of salinity increased the activities of superoxide dismutase (SOD), proline content, and POD enzyme activity.
Abstract:In 2007-2015 in the Jandar Lake, which located on the border of Azerbaijan and Georgia, 246 fishes of 18 species was studied by a method of complete helminthological autopsy and 21 species of trematodes were found. Most of the detected species are parasites of intestine, muscles and lens of the eyes; in the each of other organs of fish only one species was found. All found species, with the exception of one, are able to parasitize in representatives of one or several families of fishes. In benthophages more than in other fishes were found the species which infect fish as result of eating of benthic invertebrates. In the intestine of predator fishes the trematodes of swallowed by them fishes were registered. Among the all identified trematodes 11 species are the pathogens of fish and 2 species are dangerous to human.
Abstract:Geochemical and physiological indices gained at the reference area as well as the antropogenically disturbed area were compared. The study sites comprise 30 sample areas each. Overall, 600 samples of pine needles were designated for the delayed chlorophyll fluorescence measurement as well as 60 samples of soil and pine needles correspondingly were selected to perform the geochemical analysis. The methodology implies the method of recording the relative index of delayed fluorescence with the help of fluorimeter “Photon 10”. The data accumulated in the course of the geochemical analysis allowed to distinguish common geochemical features of the study sites and revealed differences in soil and needles qualities. The value of relative index of delayed fluorescence (RIDF) under the impact of considerable anthropogenic impact is lower by 25% and more related to the reference site. This deviation testifies that the human impact is present even on the early stage of ecosystem degradation.
Abstract:Introduction: All attempts were made to improve the healing period and properties of a dental implant. Cell culture can be used as a primitive test may give early indication about the reliability of the experiment biologically. Material and method: Ti-6Al-4V alloy discs (2mm thickness and 10 mm in diameter) were used. Surface modification of the discs by deposition of nano-structured\nalumina by physical-chemical vapor deposition on untreated and laser ablated surface and by pulsed laser deposition on untreated\ntitanium discs. In vitro study, osteoblast cell was isolated from calvaria and long limbs of 2 days old neonatal rat, cultured and seeded in\nto the experimental discs for evaluation of attachment assay, proliferation assay in 3-6-9 days incubation periods as well as cytokines analysis of TGFβ1 and IL-1β. Results: There is highly significant difference of attachment assay (P<0.01) and proliferation assay\n(P<0.05) at 3-6-9 days incubation and control group shows the least attached and proliferated cells while PLD group shows the highest. Cytokines analysis after one day of TGFβ1 concentrations were increased with increased surface roughness, while IL-1β concentration\nwas lowest in coated surfaces and highest in uncoated surface. Conclusion: Cell adhesion, proliferation and cell response were\nenhanced with coated surface in relation to uncoated surface; coating method may affect the response.
Abstract:Objective: The aim of this study is to investigate the capability of 10.6 μm pulsed carbon dioxide (CO laser with a low fluence (<1J/cm2) for reducing enamel solubility after simulated cariogenic challenge. The generated heat during irradiation couled be estimated using 3D finite element method. \nMethod: Thirty human teeth, lower third molars, were randomly divided into three groups(n=10): control group, which was not treated; fluoride group was treated by fluoride and laser group, which was irradiated by 0.83 J/cm2 10.6μm CO2 laser. Aftertreatment, all samples were subjected to a pH-cycling model for 9 days then were examined by scanning electron microscope.The calcium and phosphorous ions were measured in the remineralization solution.\nIn addition, five enamel cylinders( 2.6×3 mm) were prepared. They were irradiated by 10.6 μm CO2 laser from the front side and the temperature was measured at the opposite side by a thermocouple while the surface temperature and the distribution of the heat were obtained by finite element method. ANOVA and TUKEY test were used to determine the significance differences between means(P<0.01).\nResult: The results of the calcium measurement in the remineralization solution revealed that there was a significant difference between the laser group and control group. The SEM showed that there was no sign of ablation or cracks in the laser group.However, the calculated surface temperature was 860°C.\nConclusion: 10.6 μm pulsed CO2 laser irradiation of 0.83 J/cm2can decrease the enamel solubility ,as well as fluoride application, without any thermal damage to the pulp.
Abstract:Earthenwares are considered as the best cultural carriers in identifying and recognizing families and communities, due to different reasons such as being productive and importing. and their application in business goods transportation, and are of great importance in studying various parts of a regional culture on the one hand one hand, and other regional cultures on the other hand; Clinky ware is a local and common creativity and innovation of Parthians in the western part of Iran, which emerged in the middle ages (from about 150 a.d to the late first century a.d) and over time was extended to the other regions. In this study, according to the 200 Clinky ware-pieces obtained from 36 parthian areas, 36 earthenware-pieces were selected, which had desirable conditions in order to perform given experiments with appropriate distribution range in central Zagros cultural domain (Kermanshah, Ilam, Lorestan, Hamedan, Kurdestan and Zanjan). Since the data contains information about the given piece and could not be solely considered as a perfect archeological evidence. Hence in this study, it has been attempted to provide scientific answers regarding the source and structure of these earthenwars by carrying out different field, experimental and component parting analyses of these earthenwares (using FT-IR, XRF, XRD, EDX methods) in order to obtain new information and interpretable evidences, and also to answer archaeological questions and theories of the Parthian era.
Abstract:The metabolite content of aqueous and ethanolic extracts of Styela plicata was bio-analyzed using high pressure performance liquid chromatography (HPLC) and gas chromatography-mass spectrometry (GC-MS2). In addition, sub-acute toxicity study (28-days) was assessed for the S. plicata aqueous extract in male Sprague–Dawley (SD) rats. Several metabolites were detected where alkaloids, fatty acids and lipids are the most dominant chemical groups. HPLC analysis for the water extract confirmed the existence of 25 chemical constituents of which the majorities are Dermatansulphate, glycinsulphate, Kuanoniamine A, lissoclinamide, palmitic acid, stearic acid and Paromomycin. While ethanolic extract using GC-MS2 confirmed the existence of 5 chemical constituents of which the majorities were Actinobolin, Palmitic acid and Floxurdin. The data of sub-acute toxicity study showed that the extract concentrations up to 2600 mg/kg body weight did not create any toxic effect or death. No detectable alterations found in hematological or serum biochemical parameters of liver, renal functions and lipid profile in treated groups indicating non-toxic nature of the extract. Histopathological investigations did not show any adverse effects in any examined organs in the treated groups as compared to control. Collectively the data indicate that the water extract of S. plicata is safe, has a high margin of bioactive metabolites, and thus could be used for further medicinal studies.