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Search Results: 1 - 10 of 149734 matches for " H. Djebar "
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应用与环境生物学报 , 2006,
Toxicity of Dust of Dismissed Complex of Steel Annaba on Some Hematologic Parameters of Rabbit (Europeus)
A. Tadjine,A. Courtois,H. Djebar
Environmental Research Journal , 2012,
Abstract: Since the fog of London of 1952, in which more than 4000 people were killed in 4 days, the combined efforts of the scientists of several disciplines of disciplines, including those of environmental health, private clinics and biomedical, serious concerns concerning the impact of the pollutants of the air raised on human health. These environmental pollutants quickly are identified as important and independent factors of risk for several diseases such as respiratory affections, the cancer of lung, the atherosclerosis, the cardiovascular diseases and the disturbances of the blood parameters. In our study one was interested in the harmful action of the atmospheric pollutants on the human organism particularly on the blood parameters. Annaba, capital industrial of the Algerian east is subjected since many years to the aggressiveness of a polluted environment, in particular with the dust of dismissed complex of steel. An experimental research on rabbits (Europeus) exposed to these dust was considered. Samples of blood are taken after 3, 7 and 21 days daily exposure to 2 g of dust collected of the steel complex for a hematological study. The results of the studied parameters show a reduction in the hematocrit and haemoglobin, a disturbed evolution of the lymphocytes and leucocytes an increase in number of blood plates and a smear presenting of red blood corpuscles with a roughcast membrane.
Effects of Artea, a systemic fungicide, on the antioxidant system and the respiratory activity of durum wheat (Triticum durum L.).
N Hennouni, MR Djebar, R Rouabhi, M Youbi, H Berrebbah
African Journal of Biotechnology , 2008,
Abstract: The present work is aimed at the study of Artea (a systemic fungicide) effects on durum wheat (Triticum durum L. CV. Hard GTA). Seeds were grown in a medium containing 25, 50, 75 and 100 ppm of Artea under controlled conditions. Roots of eight day old were used to determine the enzymatic activities of catalase, ascorbate-peroxydase and gua acol-peroxydase. Root respiratory activity was also determined using a polarographic method (Clarck electrode). The results after treatment with Artea show an enhancement of respiratory activity and increased levels of antioxidative enzymes in durum wheat roots. Activities of catalase, ascorbate-peroxydase and gua acol-peroxydase increased proportionally and were more meaningful at high concentrations (75 and 100 ppm). Modulations in respiratory metabolism and antioxidant system could probably be the result of Artea induced toxicity which could cause an oxidative stress state.
The oxydative stress as inductive process of toxic action of the Cadmium on the Yeast (Saccharomyces cerevisiae)
Zaoui lilia,Djebar Mohamed Reda
Technologies de Laboratoire , 2011,
Abstract: As part in evaluation of the impact of the toxicity of heavy metals on the environment, we led a study the behavior of Yeast Saccharomyces cerevisiae towards a xenobiotic and more particularly a heavy metal: the Cadmium on the metabolism energetic. This work concerns the influence of second xenobiotic Zinc applied in treatment combined with cadmium in the presence and / or the absence of calcium on the respiratory activity of Saccharomyces cerevisiae. The obtained results showed inhibition of respiratory activity with an assimilation of oxygen about (52%) to cells treated with the concentrations 5mM and 10mM, whereas the yeast treated with Cd2+ / Ca2+ and Cd2+ / Zn2+ has a respiratory activity with a high consumption of higher oxygen (56%) compared with cells of control. This could possibly show that the activity of detoxification involvement would be dependent energy. Therefore, the measure of respiratory activity shows that the accumulation of Cd can be associated with the oxydative stress reflecting the toxic action of the Cadmium, where from the treatment in the presence of the calcium and / zinc can forbid and reduce its unwanted effects.
A preliminary analysis of the state of exploitation of the sardine, Sardina pilchardus (Walbaum, 1792), in the gulf of Annaba, East Algerian
A. Bedairia,A. B. Djebar
Animal Biodiversity and Conservation , 2009,
Abstract: This study was performed on 2,859 specimens of sardine, Sardina pilchardus, collected biweekly from November 2006 to October 2007. Samplings were carried out at the fishing port of Annaba where purse-seine methods are used for small-scale fishing at depths from 15 to 30 m. Data concerning the exploitation of catches were analysed by means of two software packages: i) FISAT (2004), which we used to determine the essential parameters for the study of dynamics; and ii) VIT (2000), the most suitable tool for stock assessment based on the application of length cohort analysis (LCA) together with a yield per recruit analyses (Y/R) based on a short series of data. VIT (2000) assumes steady state and functions with pseudo-cohorts, requiring knowledge of the catches over one year only instead of a historical series of several years. The results of this application revealed that the exploitable average biomass of the sardine stock, composed of 28 length sizes from 6.5 to 20 cm with a step of 0.5 cm, was around 4,778.93 tons, of which 2,513 tons (53%) were spawning stock. The size and the average age of the sardine stock were 12.5 cm and 2.7 years. Total biomass balance (D) was estimated at 5,508.64 tons. This corresponded to growth in weight of 4,453.77 tons, (80.85%), as compared to recruitment of only 1,054.86 tons (19.15%). Losses were caused mainly by natural mortality (M), estimated at 3,823.14 tons, and accounting for 69.40%. This was higher than fishing mortality (F) which was 1,685.5 tons (30.60%). We estimated the yield per recruit (Y/R) of sardine at 2.682 g. This value was lower than the threshold of maximum yield per recruit at 3.413 g. Though preliminary, these results indicate that the sardine population can be considered to be in a situation of under-exploitation in this area. The stock is moderately exploited for F0.1 a reference considered more appropriate for management. Applying the precautionary principle, fishing efforts should not increase and we recommend limiting fishing to current levels. However, we recommend monitoring the fishing strategy and the annual evolution of catches.
Heavy Metals in Stopping Guenitra (Skikda, Algeria) and its Tributary Wadi Sedjane
L. Tandjir,A.B. Djebar
Environmental Research Journal , 2012,
Abstract: The study is focused on the dam of Guenitra and this tributary oued Sedjane and shows the relation of the trilogy: Water, fish and concentration of heavy metals. Sampling, during the program 2002/2003, gathered the physico-chemical analysis of water and the fresh water community combined with the weather statements. The approach tests the concentrations of toxic metals in the flesh of fish and the water of 3 stations. Thus, the statistical analysis (test of Wilcoxon) treated 9 chemical variables and 7 piscicultural individuals. The results obtained confirmed that cyprinidaes retain more heavy metals: With 70 % out of zinc, 87 % out of manganese and 108% out of iron. These cyprinidaes can be recommended to cleanse, partly, the water of the reserve built on examine of iron which will be equipped with pilot hatcheries.
Euler-Lagrange Elasticity: Differential Equations for Elasticity without Stress or Strain  [PDF]
H. H. Hardy
Journal of Applied Mathematics and Physics (JAMP) , 2013, DOI: 10.4236/jamp.2013.17004

Differential equations to describe elasticity are derived without the use of stress or strain. The points within the body are the independent parameters instead of strain and surface forces replace stress tensors. These differential equations are a continuous analytical model that can then be solved using any of the standard techniques of differential equations. Although the equations do not require the definition stress or strain, these quantities can be calculated as dependent parameters. This approach to elasticity is simple, which avoids the need for multiple definitions of stress and strain, and provides a simple experimental procedure to find scalar representations of material properties in terms of the energy of deformation. The derived differential equations describe both infinitesimal and finite deformations.

Euler-Lagrange Elasticity with Dynamics  [PDF]
H. H. Hardy
Journal of Applied Mathematics and Physics (JAMP) , 2014, DOI: 10.4236/jamp.2014.213138
Abstract: The equations of Euler-Lagrange elasticity describe elastic deformations without reference to stress or strain. These equations as previously published are applicable only to quasi-static deformations. This paper extends these equations to include time dependent deformations. To accomplish this, an appropriate Lagrangian is defined and an extrema of the integral of this Lagrangian over the original material volume and time is found. The result is a set of Euler equations for the dynamics of elastic materials without stress or strain, which are appropriate for both finite and infinitesimal deformations of both isotropic and anisotropic materials. Finally, the resulting equations are shown to be no more than Newton's Laws applied to each infinitesimal volume of the material.
Linear Algebra Provides a Basis for Elasticity without Stress or Strain  [PDF]
H. H. Hardy
Soft (Soft) , 2015, DOI: 10.4236/soft.2015.43003
Abstract: Linear algebra provides insights into the description of elasticity without stress or strain. Classical descriptions of elasticity usually begin with defining stress and strain and the constitutive equations of the material that relate these to each other. Elasticity without stress or strain begins with the positions of the points and the energy of deformation. The energy of deformation as a function of the positions of the points within the material provides the material properties for the model. A discrete or continuous model of the deformation can be constructed by minimizing the total energy of deformation. As presented, this approach is limited to hyper-elastic materials, but is appropriate for infinitesimal and finite deformations, isotropic and anisotropic materials, as well as quasi-static and dynamic responses.
Spectral resolution in hyperbolic orbifolds, quantum chaos, and cosmology
H. Then
Physics , 2007,
Abstract: We present a few subjects from physics that have one in common: the spectral resolution of the Laplacian.
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