Browsing by Author "Laouini, S. E."

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Experimental Study And Development Of A Water Basin Used As Solar Sensor
(University of Eloued جامعة الوادي, 2010-01-01) Laouini, S. E.; Ben Haoua, B.; Ouahrani, M. R
Energy sources play an important role in the development of humanity, with the industrial and technological evolution of our century. Energy demand is increasing every year, for this reason we must seek an alternate source of energy more specifically new and renewable energy including solar energy. Note that solar energy is abundant, especially the south-eastern Algeria, where solar radiation is significant in any year. Given that it is the cheapest of all other energy, many researches and experiments have been conducted to recover the maximum amount of renewable energy and to address the problems of use and operation to reduce and save energy traditional. This work concerns the development of a new device is a basin filled with water used as a solar plane and a storage medium. The results obtained are very important in terms of heating water, the water temperature at outlet of basin reaches up to 74 ° C, also the inlet temperature is 29 ° C.
FREE RADICAL SCAVENGING ACTIVITY AND PHYTOCHEMICAL COMPOSITION OF ARTEMISIA (HERBA-ALBA) EXTRACT GROWTH IN ALGERIA
(University of Eloued جامعة الوادي, 2018-01-01) Laouini, S. E.; Kelef, A.; Ouahrani, M. R.
In this study, phenolic content, flavonoids, condensed tannins and antioxidant activities of Artemisia (Herba-alba) extract obtained by different extraction technique (ultrasonic assisted , classical, microwave assisted and Soxhlet) method were evaluated. ABTS, DPPH, O2‾ and FRAP scavenging methods were applied to test the antioxidant activities. The results obtaned that the classical extract showed the highest antioxidant activities and total phenolic content, against the extracts obtained by Soxhlet, ultrasonic assisted and microwave assisted. These results indicate that the classical extraction method it is the best method for extract a natural products. To conclude, these results justify the use of this plant in traditional medicine, which could be potent sources of natural drugs.
PHYSICO-CHEMICAL CHARACTERISTICS AND QUALITY OF FEED WATERS OF THE EL-OUED CITY STUDY OF CASE (FLUORINE AND ARSENIC)
(University of Eloued جامعة الوادي, 2009-07-01) Laouini, S. E.; Ladjel, S.; Ouahrani, M ed. R.
In these days, of numerous country through worlds are confronted to an excess of fluor and arsenic in the wake of drink and preoccupy by in to minimize consequences on the consumers health. The arsenic and the fluor are to scale planetary polluted them of geological origin more frequently met in underground waters. In of numerous countries in expansion, waters so contaminated are often consummated without any previous treatment. Effects inorganic reserved salts in the wake of drink, benefic or luckless acting of their concentration, are known since of numerous years today already more 1,5 billion of persons have not attack to a healthy drinking-water. According to the OMS, these are 15 million to be human who die each year after to drink of the water no potable, or for want of not to have not attack to the drinking-water . Of numerous countries being in possession regions where some waters present amounts in fluor and arsenic superior to recommendations of the OMS (0,7-1,5 mg/L for fluor and 10 L/g for the arsenic). The fluor behoves against blights and hardens the teeth enamel ;to better concentration it fragilise the bone or induces points of crystallization favoring the appearance of articular distorting arthrosis : this is her fluorose. Effects ought to the arsenic are numerous: lésions of the peel, canker, illnesses cardiovasculair or pulmonarias, hypertension and cancers. This work has been realized on the water of five boreholes of the town of El-Oued in collaboration with the laboratory of the waters Algerian (ADE). The experimentation was aiming to define them plenty of fluor and arsenic exists in five boreholes to study and in fine to estimate the quality consumptive waters
Phytochemical Analysis, Antioxidant And Antimicrobial Activities Of Leaves Extract Of Date Palm Grown In Algeria
(University of Eloued جامعة الوادي, 2012-07-01) Laouini, S. E.; Segni, L.; Ouahrani, M. R.; Gherraf, N.; Mokni, S.
In this study, we have determined the phenolic compounds, antioxidant and antimicrobial activity of methanolic extracts from three varieties of leaves tree. According to the results the leaves extracts have very important values for polyphenols (215.24 to 156.46 mg GAE / g DW) and high antioxidant activity (324. 45 to 206.21 mg GAE / g DW), DPPH (IC50 = 2.98 to 4.83 μg / ml) and β-bleaching test (IC50 = 133. 93 to 194. 12 μg / ml); also the three extracts reveal a considerable antimicrobial potency and antifungal considerable activity , the diameter of inhibition is 14.4 ± 0.6 mm for Hamraya, 19.8 ± 0.5 mm for Ghars and 17.4 ± 0.8 mm for Deglet Nour (concentration 50 mg / ml) from Staphylococcus aureus ATCC.
Scavenging Activity, Anti-inflammatory And Diabetes Related Enzyme Inhibition Properties Of Ethanol Leaves Extract Of Phoenyx Dactylifera
(University of Eloued جامعة الوادي, 2013-07-01) Laouini, S. E.; Segni, L.; Gherraf, N.; Ouahrani, M. R.; Mokni, S.
In this study we investigate the antioxidant, anti-inflammatory, and antidiabetic activities of ethanolic leaf extracts of three selected varieties of Phoenyx dactylifera L. namely: “Ghars”, “Deglet Nour” and “Hamraya”. The assessment of the antioxidant potential of crude leaf extracts, using superoxide anions inhibition, radical scavenging activity "DPPH" and total antioxidant activity essays, was carried out. Furthermore, the anti-inflammatory properties of the extracts were determined by measuring the inhibition of nitric oxide (NO) production. Moreover, the antidiabetic effect was evaluated by inhibition of α-amylase and α-glucosidase enzymes. The total phenolic content measured by Folin-ciocalteu method. The raw leaf extracts of the selected varieties were found to contain a high content of total phenolic content (342.45 mg GAE/ gDW for GE) and therefore exhibited a higher antioxidant activity and inhibitory effect of radicals scavenging activity against DPPH and superoxide anion (IC50=7.44 μg/mL and 39.11 μg/mL respectively).