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Search Results: 1 - 10 of 22 matches for " Nassira Benabid "
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Affective Responses of Early Life Photoperiod in Male Wistar Rats  [PDF]
Nassira Benabid, Ali Ouichou
Neuroscience & Medicine (NM) , 2011, DOI: 10.4236/nm.2011.23025
Abstract: Behavior changes season dependant are probably linked to change in day length or photoperiod. Although much research on seasonality in small mammals has focused on photoperiod manipulations in adults, early life photoperiod is also an important source of seasonal information and can establish individual’s developmental trajectory by regulating somatic and reproductive development and affective responses to day lengths later in life. The experiments developed in this work are based on the hypothesis that early life photoperiod affect emotionality in adult rats. To cheek this hypothesis, male rats were exposed at birth to different photoperiods (LP: 16L/8D; SP: 8L/16D). 8, 16 or 24 weeks later, rats were subjected to different behavioral tests to quantify anxiety-like behavior. Independently of duration, rats exposed to SP exhibited higher levels of anxious-like behavior than rats raised in LP, in an open field test (OFT) and in elevated plus maze (EPM). Repeated comparisons showed that photoperiod effect was accentuated after 16 weeks of treatment. 24 weeks of treatment failed to induce any effect on emotionality in male rats. Our results indicate that changes in day length are associated with different levels of anxious-like behaviors; consistent with the conjecture that early life photoperiod may influence affective behavior in adult male rats.
Study of the Translocation and Distribution of Cadmium into Bean Plants (Phaseolus vulgaris) Using Labelled Cd-109  [PDF]
Hocine Benabid, Mohamed Fouzi Ghorab
World Journal of Nano Science and Engineering (WJNSE) , 2013, DOI: 10.4236/wjnse.2013.33015
Abstract:
The motivation of this work was dictated by a concern of using bioaccumulative plant species likely to be used in the technique of bioindication. The obtained results and discussions proposed are approaches of chemist, because the mechanisms of the effect of cadmium on the various plant cells have been widely developed by several biologists. The use of labeled cadmium is important to study the uptake, the translocation and the metabolism at very low levels of this element in plants. Bean (Phaseolus vulgaris), the model chosen for the investigation, was cultivated in vermiculite for 12 days. After this period, plants were transferred into 100 ml flasks containing nutrient solution and radioactive Cd-109 (γ, t1/2 = 461.3 days) with variable activity of: 0.05, 0.1 and 1.0 micro Currie (μCi). Samples were transferred to a growth room and left for periods of 4 and 7 days, then analyzed by the solid scintillation method. The counting was carried out for roots, stems and leaves.
Insecticidal Activity of Bacillus thuringiensis on Larvae and Adults of Bactrocera oleae Gmelin (Diptera:Tephritidae)  [PDF]
Faiza Ilias, Nassira Gaouar, Kanza Medjdoub, Mireille Kallassy Awad
Journal of Environmental Protection (JEP) , 2013, DOI: 10.4236/jep.2013.45056
Abstract:

The olive fruit fly Bactrocera oleae is a major olive pest in Algeriaand other Mediterranean countries. Its attacks, in some cases, seriously compromised production. Bacillus thuringiensis is a spore-forming soil bacterium which produces a protein crystal toxic to some insects. The objective of this study was to search for isolates toxic to larvae and adults of B. oleae. Four doses test were performed on neonate larvae, second instar larvae and third instar larvae. Seven Bt strains examined, showed highest toxicity levels against adults. 86% mortality was observed against neonate larvae after 7 days of application by Bt toxin isolate. The mortality of the second instar larvae was 65% mortality at dose of 108 UFC/mL. The third instar larvae was very susceptible to Bt strain with 70% of mortality. This study demonstrated that some local Algerian B. thuringiensis isolates exhibit toxic potential that could be used to control B. oleae.

Vibratory Phenomena of Magnetic Origin in ElectricalMachines: Study and Modeling Using FEM Techniques
Nassira Ferkha,M. Rachid Mekideche,Tarik Hacib
International Journal of Electrical and Power Engineering , 2012,
Abstract: This study presents a theoretical study of the coupled magneto-elastic phenomena, with a view to modeling the vibratory behavior of squirrel cage asynchronous machine. A coupled model is developed to calculate the mechanical deformations of this machine in magnetic field. The two equations governing magnetic and mechanical phenomena are solved using finite element method. The magnetic force distribution is calculated through a local application of virtual work principle. A spectral analysis of this force made it possible to determine the dynamic response of the stator for each harmonic force. This response has been calculated only after a modal analysis which could determine the resonance frequencies and its proper associated modes.
Cadmium as an Environmental Pollutant Use of Plant as Bio-Indicator of Pollution (In vivo Experimentation) Influence of Cadmium on Chlorophyll Content of Canadian Wonder Beans (Phaseolus vulgaris)
Hocine Benabid,Mohamed Fouzi Ghorab,Abdelbaki Djebaili
Research Journal of Applied Sciences , 2012,
Abstract: Cadmium like other heavy metals is known to be a serious toxic element and one of the most hazardous environmental pollutants not only to soil and plants, but also to humans and animals. Studies carried out in different plant species have revealed that Cd is strongly phytotoxic and causes growth inhibition and even plant death, although the mechanisms involved in its toxicity are still not completely understood. The present investigation was aimed at highlighting some of the problems related to Cd and trying to answer some of the questions that have arisen as a consequence of Cd behavior and its toxic nature to plant species. The culture experiment of beans Phaseolus vulgaris was carried out in a hydroponic solution with variable Cd concentrations to determine the effects of different concentrations of Cd on photosynthesis and chlorophyll content. Chlorosis was the primary symptom caused by Cd toxic levels and this led to the study of its causes by investigating the effect of Cd on Chlorophyll formation and its content in plants. In that respect, one question appeared to be important about the nature of the effect of Cd on chlorophyll and Mg concentration was the first conclusion obtained on the basis of evidence achieved from analysis of the chlorophyll content by atomic absorption and ultra violet spectroscopy. Although some results were obtained indicating the formation of free-Mg chlorophyll suggesting the disturbance of the pigment and probably the removal of Mg caused by the increase of Cd concentrations in the chlorophyll. But more still to be achieved to suggest a possible displacement of Mg by Cd. Meanwhile a speculative view was considered to explain the matter by suggesting that Cd was rather interfering with other divalent elements such Fe and Cu which are known to be involved in the chlorophyll synthesis than Mg directly.
Ankylosing spondylitis associated with Sweet’s syndrome: a case report
Mansouri Samia,Abourazzak Fatima Ezzahra,Aradoini Nassira,Bettioui Asmae
Journal of Medical Case Reports , 2013, DOI: 10.1186/1752-1947-7-16
Abstract: Introduction Sweet’s syndrome is an acute neutrophilic dermatosis characterized by a diffuse dermal infiltrate of mature neutrophils. In most cases, it occurs as an isolated phenomenon (idiopathic Sweet’s syndrome) but it can be drug induced or associated with a variety of underlying diseases such as infections, neoplasms, and chronic inflammatory diseases. The association between Sweet’s syndrome and ankylosing spondylitis is rare. Only a few cases have been reported in the literature. We report a new case in which we describe an outbreak of acute neutrophilic dermatosis revealing ankylosing spondylitis. Case presentation A 33-year-old Moroccan man presented with large-joint polyarthralgia, inflammatory pain in his buttocks and lower lumbar spine, fever and skin lesions. On examination, the patient had a low-grade fever, six tender but not swollen joints, limitation of motion of the lumbar spine, and painful erythematous maculopapules over his face, neck, and hands. Laboratory tests showed hyperleukocytosis, and elevated erythrocyte sedimentation rate and C-reactive protein. The immunological tests and infectious disease markers were negative. Investigations for an underlying neoplastic disease remained negative. Magnetic resonance imaging showed a bilateral sacroiliitis. Skin biopsy findings were consistent with Sweet’s syndrome. The diagnosis of Sweet’s syndrome associated with ankylosing spondylitis was established. Nonsteroid anti-inflammatory drugs were started and the patient showed rapid clinical and biological improvement. Conclusion Three observations of the association between Sweet’s syndrome and spondylarthropathy have been reported in the literature. The cause of this association remains unclear. Some hypotheses have been developed, but further studies are needed to confirm or refute them.
Cadmium as an Environmental Pollutant Study of Evolution of Cadmium, its Effects on Beans (Phaseolus Vulgaris) and its Interaction with Zinc
Hocine-Benabid,Mohamed Fouzi-Ghorab,Abdelbaki Djebaili
Research Journal of Applied Sciences , 2012,
Abstract: Cadmium like other heavy metals is known to be a serious toxic element and one of the most hazardous environmental pollutants not only to soil and plants, but also to humans and animals. The increasing emission of Cd from a variety of sources because it is commonly used in many fields created a great interest about the possible movement of Cd and other heavy metals into the atmosphere, water and food chain as a result of plant uptake. The presence of a number of heavy metals creates interactions between them in soil or within the plant. This study summarizes the various effects of Cd on beans (Phaseolus Vulgaris) and its responses by studying the behaviour of the element in bean plants as reduced by Zn competition with Cd chosen for the purpose of minimizing potential damage that could result from the exposure to cadmium. Analyses were carried out using spectroscopic techniques and the results obtained have shown the great toxicity of Cd and the fragile resistance of the plant indicated by the quick response to the various concentrations of the element and the antagonistic relation with Zn added at different concentrations. The study also indicates the direct effect of pH on the availability and the bioaccumulation of the element into the plant.
Effects of Pressed and Extruded Foods on Growth Performance and Body Composition of Rainbow Trout (Oncorhynchus mykiss)
Mustapha Aba,Belghyti Driss,Elkharrim Khadija,Benabid Mohammed
Pakistan Journal of Nutrition , 2012,
Abstract: In order to compare the growth performance and quality of flesh of Oncorhynchus mykiss, with two types of food the pressed and extruded foods, an experimental test was conducted in a fish farm. The comparison of both foods with different formulation and different energy is performed in isoenergetic conditions. Following this study, two plans were formulated: the extruded food with 42% crude protein, 28% fat and 17% carbohydrate while the pressed food with 44.7% Crude Protein, 15% fat and 28.6 carbohydrates with digestible energy of 20.9 Mj and 16.48 Mj. The initial average weight of the trouts was 474 g and the fish were bred in two circular tanks supplied with fresh water in open circuit. Each group was fed twice a day. Within a 60 day-experiment, the final average weight of the extruded food group was 759 g (60.12% weight gain) and 724 g for the pressed food group (52.74 % weight gain). The best conversion rate was obtained with the extruded food with 1.17 v.s 1.56 with a survival rate of respectively 98.85 and 97.72%. The extruded feed resulted in more protein, more fat and less moisture in the fillets. Manufacturing technology and the formulation of both foods have had a major influence on the growth performance and flesh quality of rainbow trout.
Thermal modelling of cooling tool cutting when milling by electrical analogy
Benabid F.,Arrouf M.,Assas M.,Benmoussa H.
EPJ Web of Conferences , 2010, DOI: 10.1051/epjconf/20100603006
Abstract: Measurement temperatures by (some devises) are applied immediately after shut-down and may be corrected for the temperature drop that occurs in the interval between shut-down and measurement. This paper presents a new procedure for thermal modelling of the tool cutting used just after machining; when the tool is out off the chip in order to extrapolate the cutting temperature from the temperature measured when the tool is at stand still. A fin approximation is made in enhancing heat loss (by conduction and convection) to air stream is used. In the modelling we introduce an equivalent thermal network to estimate the cutting temperature as a function of specific energy. In another hand, a local modified element lumped conduction equation is used to predict the temperature gradient with time when the tool is being cooled, with initial and boundary conditions. These predictions provide a detailed view of the global heat transfer coefficient as a function of cutting speed because the heat loss for the tool in air stream is an order of magnitude larger than in normal environment. Finally we deduct the cutting temperature by inverse method.
Deeply-trapped molecules in self-nanostructured gas-phase material
M. Alharbi,A. Husakou,B. Debord,F. Gerome,F. Benabid
Physics , 2015,
Abstract: Since the advent of atom laser-cooling, trapping or cooling natural molecules has been a long standing and challenging goal. Here, we demonstrate a method for laser-trapping molecules that is radically novel in its configuration, in its underlined physical dynamics and in its outcomes. It is based on self-optically spatially-nanostructured high pressure molecular hydrogen confined in hollow-core photonic-crystal-fibre. An accelerating molecular-lattice is formed by a periodic potential associated with Raman saturation except for a 1-dimentional array of nanometer wide and strongly-localizing sections. In these sections, molecules with a speed of as large as 1800 m/s are trapped, and stimulated Raman scattering in the Lamb-Dicke regime occurs to generate high power forward and backward-Stokes continuous-wave laser with sideband-resolved sub-Doppler emission spectrum. The spectrum exhibits a central line with a sub-recoil linewidth of as low as 14 kHz, more than 5 orders-of-magnitude narrower than in conventional Raman scattering, and sidebands comprising Mollow triplet, molecular motional-sidebands and four-wave-mixing.
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