Browsing by Author "Laiche Aouidane"

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    Effects of the methane-inhibitors Nitrophenol, 5-Nitrobenzimidazol and two new synthetic nitrocompounds on in vitro ruminal fermentation
    (journal homepage, 2018) Laiche Aouidane
    The objective of this study was to examine the effects of four nitrocompounds (Nitrophenol, 5-Nitrobenzimidazol and two synthetic nitrocompounds ABLE 244 and ABLE 245) on methane production and fermentation characteristics using in vitro rumen batch culture. 0, 2, 8 or 12 µM of each nitrocompound were incubated. The higher concentrations of Nitrophenol and 5-Nitrobenzimidazol produced 60% less CH (P < 0.05) compared to controls, while two synthetic nitrocompounds ABLE 244 and ABLE 245 had no effect on CH 4 production. Quantification of fermentation end-products indicated that fermentation efficiencies were not compromised by the nitro-treatments. 4
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    Geochemical and multivariate statistical study to assess the salinisation origin of the Remila plain groundwater, Khenchela Algeria
    (JOURNAL OF WATER AND LAND DEVELOPMENT, 2021-03-31) Laiche Aouidane
    Abstract: The aquifer system of the Remila plain (Khenchela, Algeria), covering 250 km 2 , is one of the semiarid regions where groundwater is heavily exploited for urban supply and irrigation. An integrated hydrochemical and statistical analysis was performed on 70 water samples to identify the main processes and the origin of salinisation of our waters. Chemical analyses indicate salinity values (TDS) ranging from 568 to 1586 mg·dm –3 with an average of 869 mg·dm –3 , with sulphate being the dominant ions, especially in the north and northeastern parts of the region. The identified chemical facies are SO 4 -Cl-Ca in the northeastern part, SO 4 -Cl-Ca-Mg present in most waters, and HCO 3 - Ca-Mg in the southeastern part. We applied the statistical approach to group the waters into three categories using Principal Component Analysis (PCA) and Hierarchical Clustering Analysis (HCA); 1) saline waters (23%) (TDS > 1000 mg·dm –3 and SO 4 2– dominance), 2) moderately saline waters (51%) with HCO 3 – dominance, 3) moderately saline waters (26%) with a mixed facies. The binary ion diagrams used suggest that the main hydrochemical processes are: evaporites dissolution and/or precipitation, accompanied by an exchange and/or reverse exchange of ions. Additionally, another process was detected in the northeastern part of the area; the saline intrusion of Sabkha waters, favoured by intensive aquifer exploitation.
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    Geochemical and multivariate statistical study to assess the salinization origin of the Remila plain groundwater, Khenchela Algeria
    (JOURNAL OF WATER AND LAND DEVELOPMENT, 2020) Laiche Aouidane
    The aquifer system of the Remila plain 250 km2 (Khenchela, Algeria) is one of the semiarid regions where groundwater is heavily exploited for urban supply and irrigation. An integrated hydrogeochemical and statistical approach was performed by 70 water samples to identify the main processes and the origin of our waters’ salinization. Chemical analyses indicate salinity values (TDS) ranging from 568 to 1586 mg.l-1 with an average of 869 mg.l-1, sulphate is the dominant ions, especially in the north and northeast part. While the identified chemical facies are : SO4-Cl-Ca in the northeastern part, SO4-Cl-Ca-Mg presents most waters and HCO3-Ca-Mg in the southeastern part. The statistical approach, which allowed us to group the waters into three groups using PCA and HCA; 1) saline waters (23%) (TDS > 1000 mg.l-1 and SO42- dominance), 2) moderately saline waters (51%) with HCO3- dominance, 3) moderately saline waters (26%) with a mixed facies. The binary ion diagrams used suggest that the most hydrochemical processes are: evaporites dissolution and/or precipitation, accompanied by an exchange and/or reverse exchange of ions. Additionally, another process was detected in the northeastern part of the area; the saline intrusion of Sabkha waters, favored by intensive aquifer exploitation.
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    In vitro evaluation of the anti-microbial activity and the anti-oxidant activity of the flavonoids extracted from the flowers of the Tamarix africana Poir
    (Journal of Biosciences, 2017-07-31) Laiche Aouidane
    The aim of this work is to determine the quantity, the quality, the antimicrobial activity and the antioxidant power of various extracts of the flavonoids obtained from the flowers of Tamarix africana Poir. The quantification of the extracts obtained was revealed in high yield of the flavonoids with respectively: the methanoic extracts (26.31%), the extracts of the aqueous phase (19.29%), the extracts of ethyl acetate (0.87%), the extracts of petroleum ether (0.18%). The qualitative study, using the thin-layer chromatography (TLC), showed the dominance of Flavonols, flavones, isoflavones, flavanones and 3-glycosidic Anthocyanidins. The study of microbial activity revealed an important bactericidal power for the extracts of the aqueous phase on Gram + bacteria with a disc of inhibition of 24±1mm on Staphylococcus aureus ATCC43300 and 20±1mm on Staphylococcus aureus ATCC 25923, For the antifungal activity all the extracts gave important effects on Podosphaera leucotrichia (apple powdery mildew), with a maximum disc inhibition of 20±1mm for the ethyl acetate extracts, on the other hand alone The ether extracts of the petrol which showed an inhibitory effect on Penicillium sp. The antioxidant study, expressed as a percentage of DPPH, showed a high efficiency of the various extracts; In particular that of the ethyl acetate extract which inhibits oxidation and traps the free radicals at 100%, which demonstrating the use of this plant in traditional medicine for the treatment of certain types of cancer.
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    Integrated statistical and hydro-geochemical approach to identify the origin and process of saline contamination of Remila plain groundwater (Khenchela, Algeria)
    (Earth and Environmental Science Transactions of the Royal Society of Edinburgh, 2021-01-11) Laiche Aouidane
    Groundwater is widely used in the semi-arid region of Remila plain (Khenchela, Algeria) for urban and agricultural supplies. An integrated statistical and hydro-geochemical approach was performed with 70 water samples in order to identify the main processes and the origin of water salinisation. The results have suggested the dominance of three chemical facies: Sulphato cloruro calcic (SO 4 –Cl–Ca) in the northeastern part, Sulphato cloruro calci magnisian (SO– Cl–Ca–Mg) in most of the waters andalkali-earth bicarbonate (HCO 3 4 –Ca–Mg) in the southeastern part. Although based on principal component analysis and hierarchical clustering analysis, the statistical approach identified three water groups: (1) saline water (17 %; total dissolved solids >1000 mg l −1 with the dominance of Sulphate (SO 4 2− )); (2) moderately saline water (17 %) with a dominance of bicarbonate (HCO ); and (3) moderately saline water (66 %) with mixed facies. The binary diagrams confirmed the predominance of three processes: evaporite dissolution and/or precipitation, combined by ionic exchange. In the northeastern part of the area, however, another process was detected – the saline intrusion of Sabkha water, favoured by extensive groundwater use. 3 −
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    La dynamique agricole dans la zone d'El Ghrous (Biskra) : entre le boom maraîcher et la lente généralisation des systèmes de production phoenicicoles
    (2011) Laiche Aouidane
    In the current study we investigate the farming system development in the region of El Ghrous (Biskra), through evolution trend of three identified farm kinds (palm, truck farming, and mixed). The result show that the evolution of the old farms began with a partial occupation of land by the date palm followed by an introduction and extension Plasticulture then became a holding palm where other crops are marginalized. The truck farming system production in the region is profitable and has been widespread, but remains cyclical and tends to be replaced by the mixed systems (phoeniculture –gardening) to become a purpose – palm.
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    The impact of small ruminants breeding in the operation of oasian agricultural farms in Algeria
    (Journal of Livestock Science, 2021) Laiche Aouidane
    This work focuses on the study of the impact of small ruminantsbreeding in oasis agriculture in the Oued-Righvalley in south-eastern Algeria. Fifty (50) farms maintaining livestock were surveyed using a questionnaire. A principal component analysis (ACP) was performed to determine the typology of the farms studied, using structural and operational variables. Based on ten (10) variables including three qualitative (type of exploitation according to status, prophylaxis and coverage of the animal by food) and seven (07) quantitative (age, area of farms, forage area, organic matter used, organic matter purchased, number of goat heads, number of sheep heads), three types of farms were identified. Type 1 comprises 33 farms (66%), with an area of 0.5 to 2 hectares and an average of 5.6 heads of animals per farm. Type 2 comprises seven farms (14%), with an area of 2.5 to 19 hectares and an average of four heads of animals per farm. Type 3 comprises 10 farms (20%), with an area of 5.2 to 19 hectares and an average of seven animals per farm. The study showed that the farms studied are impacted by the lack of organic matter from their livestock, used in the amendment of their crops, due to the regression in the number of livestock and the narrowness of livestock areas.