OALib Journal期刊

ISSN: 2333-9721




2019 ( 32 )

2018 ( 184 )

2017 ( 167 )

2016 ( 241 )


匹配条件: “ Souad El Amrani” ,找到相关结果约13213条。
Study of effects of aluminium chloride on histological structure of liver and spleen in pregnant rats and their offspring
Technologies de Laboratoire , 2011,
Abstract: Histological study of organs reflects the General State of animals, including, if they are subject to treatment. The purpose of our study is to elucidate the effect of the administration of different doses (50, 100 and 200 mg/Kg/day) of aluminum chloride during the days 9-13 of gestation on the histological structure of the liver and the spleen of pregnant rats and their offspring. In pregnant rats, AlCl3 leads, at the level of the liver, to a very important development of the connective tissue of the centrilobular vein, with inflammatory foci and hepatocyte injury. While at the level of the spleen, there is a development of the white pulp against the red pulp with an abundance of conjunctive fibres and dilation of the lining of arterioles, which reflects a failure of the circulatory system. The fetuses of rats treated by AlCl3, show no change in the histological structure of the spleen. The AlCl3 action is more marked than mothers in their fetuses. This certifies that the placenta forms a more or less selective barrier to some constituents, and that spleen in fetuses temporarily offset the effects of AlCl3
Survey of the Consumption of Energy Drinks and Frequency of Obesity in a Population of Academics from Casablanca  [PDF]
Imane M'Touguy, Nadia Iounes, Fatema Zehra Mahfoud, Marwa Chhail, Amine El Khatib, Rachid Saile, Souad El Amrani, Houriya Mestaghanmi
Open Access Library Journal (OALib Journal) , 2016, DOI: 10.4236/oalib.1103259
Background: An energy drinks supposed to give a boost of energy to the consumer. It usually contains caffeine and lot of sugar. We studied the risks associated with the consumption of these drinks, the conditions in which they are consumed and the frequency of obesity in the determination of body mass index among 195 students of the Faculty of Sciences Ben M’Sik. Methods: This is a survey conducted by students of the Ben M’sik Faculty of Sciences, Hassan II Casablanca University, during the year 2015, using a questionnaire exploring the consumption of energy drinks. Results: Our study shows 195 of surveyed students consuming energy drinks, of which 22.0% are girls and 78.0% are boys, of which 16.5% were overweight, 5.5% moderate and 2% severe obesity. 9.2% of students consume them to quench the thirst, 10.8% to bring their body energy, 7.7% for their taste, 21.5% to mitigate fatigue, 6.2% to stimulate and 44.6% for all the reasons cited. 4.6% say they associate them with tobacco, 4.0% with alcohol and 6.8% with some drugs during review periods. The consequences of poisoning these drinks can be serious health and manifest as tachycardia (3.2%), agitation or confusion (29.3%), abdominal pain (7.9%), hypertension (19.4%). These symptoms experienced are significantly higher among consumers of these drinks compared to controls. Witnesses consume either energy drinks or sugary drinks. Discussion/Conclusion: That frequent consumption of energy drinks may pose a risk and a danger to the health of consumers, hence the need for awareness especially young people against their effects. Public health organizations must also keep a close watch on this new trend.
Impact of Eating Habits and Lifestyle on the Oral Health Status of a Casablanca’s Academic Population  [PDF]
Houriya Mestaghanmi, Ali Labriji, Imane M’Touguy, Fatima Zahra Kehailou, Said Idhammou, Nabil Kobb, Fatema Zahra Mahfoud, Ahmadaye Ibrahim Khalil, Souad El Amrani
Open Access Library Journal (OALib Journal) , 2018, DOI: 10.4236/oalib.1104967
Introduction: Bad eating habits can have serious impact on oral health. Objec-tives: To study the impact of eating habits and dental hygiene practices on the dental status of students. Methods: Cross-sectional study of 400 students aged 17 and more, from the Ben M’Sik Sciences Faculty. A questionnaire on the so-cio-economic level of the parents, the eating habits, the means of hygiene and the oral health status has been filled in anonymously by the respondents. Uni-variate and multivariate descriptive and comparative analyzes were per-formed by the software SPSS 21. Results: The population’s average age is 20 ± 1.59 years old consisted of 55% of boys and 45% of girls. The breakfast is consumed by 67% of students. 39.58% respondents consume sweetened drinks during the meals and 60% at the end of meals and 66% are snacking during the day. 92% of students say they brush their teeth. The brushing time varies between 1 and 3 minutes. 37% of students do never consult a dentist and 63% in case of dental problems. The prevalence of caries is 66%. There is a positive association between the prevalence of tooth decay and certain eating habits (sweet things consumption (p = 0.08), cakes (p = 0.018) and chocolate (p = 0.019) outside of meals). However, this correlation is negative, when the consumption of these foods is done during meals (p > 0.74). On the other hand, there was no correlation between alcohol consumption and presence of caries (p = 0.172), tobacco consumption (p = 0.319), and socioeconomic status parents (p = 0.733). Conclusion: Oral hygiene and regular monitoring by a dentist with healthy eating habits can have a significant impact on the oral status of students.
Effect of the Number and Orientation of Fractures on the P-Wave Velocity Diminution: Application on the Building Stones of the Rabat Area (Morocco)  [PDF]
Hamid El Azhari, Iz-Eddine El Amrani El Hassani
Geomaterials (GM) , 2013, DOI: 10.4236/gm.2013.33010
Abstract: This study is focused on two types of Moroccan rocks, among the most widely used as building stones: the calcarenite of Salé (CS) and the marble of oued Akrech (MA). The two rocks, lithologically different, show a clear contrast of their P-wave velocities (Vp): 3.90 vs 5.10 km/s at dry state and 4.29 vs 5.64 km/s at saturation. The “Artificial fractures” created in the two rock types reveal that their Vp undergo diminutions which the rates vary depending of the number and the plane orientation of the fractures. In the CS, Vp shows an increasing of cumulative diminution (Dc) according to the number of fractures, but with a variable rate of unitary diminution (Du) from one fracture to the other. This defines a linear regression with a low coefficient of determination (Dc = 10.18NbFr + 10.96; r2 = 0.87). The mode of the Vp evolution would be related to the roughness of fractures surface, which itself depends upon the petrographic nature of the calcarenite (friable structure, high porosity and heterogenous composition). The MA manifested an increasing Dc with a fairly constant rate of Du from a fracture to another, giving a regression line with a high coefficient of determination (Dc = 12.17NbFr10.69; r2 = 0.99). This steady diminution of Vp would be related to the granoblastic texture and the monomineral composition of the marble, which engender smoother fracture surfaces. The rates of Vp diminution also depend on the orientation plane of the fractures relative to the direction of wave propagation. The fractures parallel (θ = 0°) amplify slightly the Vp, playing a significant role of “waveguide”. The fractures oriented at 45° lead to a diminution lower than those of fractures oriented at 25° and 90°. The same trend of diminution, but at variable rates, appears on the samples of the two types of stones at dry and saturated state. This can be explained by the compressive nature of P-waves, which obey the physic laws of the transmission of the constraints in the solid mediums.
Composition and Refractory Properties of Mixtures of Moroccan Silica-Alumina Geomaterials and Alumina  [PDF]
Chaouki Sadik, Iz-Edinne El Amrani, Abderahman Albizane
New Journal of Glass and Ceramics (NJGC) , 2013, DOI: 10.4236/njgc.2013.32010

Five mixtures (M1 to M5) of silica-alumina geomaterials and two varieties of alumina (AP and AR) were used for the elaboration of mullite refractory materials between 1500 and 1600. An X-ray diffraction (XRD) analysis showed that the refractory samples are composed of mullite, corundum and silica. The length of the mullite crystals was measured by a method of image analysis of scanning electron microscopy (SEM). Chemical and mechanical properties of these materials were investigated and correlated with their microstructure. Resistance towards Acid Attack test showed that the refractory samples present good resistance, as well as, the alumina powder AR obtained from waste of silica-alumina bricks proves to be efficient for an eventual use.

Effect of Carbon Graphite on the Crystallization of Andalusite: Application to the Synthesis of Mullite and the Improvement of Refractory Quality  [PDF]
Chaouki Sadik, Iz-Eddine El Amrani, Abderrahman Albizane
Materials Sciences and Applications (MSA) , 2013, DOI: 10.4236/msa.2013.46044

Different mixtures of Moroccan silica-alumina geomaterials were used for the preparation of refractory ceramics. A formula of composition (M2) has allowed obtaining a good quality of refractory. Addition of a small quantity of carbon (1%) to the M2 formula has substantially improved the quality of the refractory. The morphological, textural and mineralogical evolution, through SEM and XRD shows that the addition of carbon, which plays a catalytic role, favors the crystallization of andalusite. Then, from 1200°C, the andalusite starts to transform to primary mullite needles. At 1400°C, the mullite becomes the major mineral phase beside cristobalite and vitreous phase.

Effect of a microbial-based acaricidal product on spotted and predatory spider mites
M Lagziri, A El Amrani
African Crop Science Journal , 2009,
Abstract: Tetranychus urticae is one of the most important pests of strawberry cultures in Morocco. Current control of this pest relies almost exclusively on acaricides. Unfortunately, this mite has developed resistance to most of the available acaricides. Moreover, insecticide treatments are responsible for the reduction or suppression of beneficial species such as natural predators. Thus, identification of selective pesticides that are more toxic to pest species than on natural enemies, is urgently needed. This study assessed the effectiveness of abamectin, a microbial-based miticide, and bifenthrin, a synthetic one, on two-spotted spider mites, Tetranychus urticae and predatory mites, Phytoseiulus persimilis. Laboratory tests were conducted to determine the direct and residual effects of two miticides (abamectin and bifenthrin) at several doses in geometric progression. Firstly, the direct efficacy of the two acaricides was evaluated against T. urticae and P. persimilis. Abamectin had high efficacy on T. urticae and significantly less toxicity against P. persimilis. Results indicated an effective control of T. urticae, at least 2 weeks after abamectin foliar application. Thus, abamectin could be recommended as a selective acaricide in integrated mite management programmes because of its strong efficacy on pests, its persistence and its limited toxicity on predatory mites.
A geometric proof of the Lelong-Poincaré formula
M El Amrani,A Jeddi
Proyecciones (Antofagasta) , 2013,
Abstract: We propose a geometric proof of the fundamental Lelong-Poincaré formula : dd c log |/ | = [/ = 0] where f is any nonzero holomorphic function defined on a complex analytic manifold V and [/ = 0] is the integration current on the divisor of the zeroes of /. Our approach is based, via the local parametrization theorem, on a precise study of the local geometry of the hypersurface given by /. Our proof extends naturally to the meromorphic case.
Role of Cell Surface Structures in Biofilm Formation by Escherichia coli  [PDF]
Hafida Zahir, Hamadi Fatima, Lekchiri Souad, Mliji El Mostafa, Ellouali Mostafa, Latrache Hassan
Food and Nutrition Sciences (FNS) , 2015, DOI: 10.4236/fns.2015.612121
Abstract: This study aims to understand the relationship between capabilities of Escherichia coli strains to form biofilm and serotype groups expressed on cell surface. Sixteen strains of E. coli were originally isolated from different food processing lines in different Moroccan cities. Strains serotyped based on their O (somatic), H (flagellar), and K (capsular) surface antigen profiles using different antiserums. Biofilm assays carried out in 96-well microtiter dishes using the method of O’Toole et al. Our results show that no clear relation observed between origin and serotype groups. In the other hand, we observed that not all studied strains were able to form biofilm. Furthermore, combination of antigens H40 and K11 appears to be involved in biofilm formation. In fact, the H antigen seems to be implicated in the placement of the bacterial cells near the surface and the K antigen may play a role in physicochemical interactions between bacteria and inert surface.
Influence de la nature chimique et minéralogique des argiles et du processus de fabrication sur la qualité des carreaux céramiques Influence of chemical and mineralogical nature of clay and manufacturing process on the quality of ceramic tiles
Sadik C.,El Amrani I.,Albizane A.
MATEC Web of Conferences , 2012, DOI: 10.1051/matecconf/20120201016
Abstract: La présente étude correspond à une approche pluridisciplinaire menée en étroite collaboration entre des géologues, des chimistes et des industriels de la céramique. Les résultats confirment l’étroite relation existante entre la composition des argiles et la qualité du produit céramique final. Les briquettes obtenues, dans les mêmes conditions, à partir de deux argiles marocaines assez différentes du point de vue chimique et minéralogique, présentent des caractéristiques technologiques bien distinctes. l’utilisation d’adjuvants minéraux, bien sélectionnés, contribue à l’équilibrage des argiles brutes et conduit à une nette amélioration de la qualité du produit céramique, notamment une réduction de leur retrait à la cuisson et une augmentation de leur résistance à la flexion. Concernant l’effet du processus de fabrication, l’application de l’engobe et de l’émail, s’avère être à l’origine de bombement des carreaux lors de la cuisson, en raison vraisemblablement de la différence des coefficients de dilatation des deux milieux argile et émail. This study is conducted in a multidisciplinary collaboration between geologists, chemists and industrial ceramics. The results confirm the close ralatioship existing between the composition of clays and quality of the finished ceramic pieces. The obtained specimens, under the same conditions, from two moroccan clays that are different on the chimico-mineralogical point of view, present distinct technological characteristics. The use of well selected mineral adjuvants, contributes to the balancing of raw clays and leads to a marked improvement in the quality of the ceramic product, including a reduction on their firing shrinkage and an increase of flexural strength. Concerning the effect of the manufacturing process, the application of the glaze, turns out to be the cause of bulging tiles during firing, probably because of the difference in thermal expansion coefficients of two materials clay and glaze.

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