JFAS_Vol 06 N 02
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Item Valuation Of Conditions Of Mechanized Milking Of Cows And Of The Mammary Health Situation In The East Central De Sousse (tunisia)(University of Eloued جامعة الوادي, 2014-07-01) M’sadak, Y.; Makhlouf, M.; Sboui, H.The aim of this study is to evaluate mainly the conditions the milking and the mammary health status of cows in the central East Sousse (Tunisian Sahel). The study was conducted on a sample of 20 small and means dairy cattle herds aboveground divided into two study areas. This study examined the general conditions of cattle, the practices of trafficking and the situation mammary health of cows, while completing the analysis by assessing quantitative losses caused in the product milk. The situation detected in the elevages requires an effective response against mastitis while trying to control the risk factors in small and medium farms herds aboveground.Item Study Of The Microbiological Analyses Carried Out At The Laboratory Of A Public Hospital (chr Al Idrissi Of Kenitra)(University of Eloued جامعة الوادي, 2014-07-01) Aziane, A.; Elyachioui, M.; Elhessni, A.The present work attempts to make a study on the microbiological analyses of pathogens (bacteria or viruses) that are at the origin of the human disease, carried out in the laboratory of microbiological analyses of hospital regional CHR al IDRISSI of Kenitra for a period that extends from the year 2007 to 2009 in order to clarify the methodology of work and the problem of infections in developing countries. Our work is based on the monthly inventory of pathogens (E. Coli, Staphylococcus, Streptococcus, Klebsiella, Enterobacter, Candida albicans, Pseudomonas, Syphilis, hepatitis viruses and HIV) in deferens samples (Urine, Pus, saddle, like and Serum) in patients in relation with total analyses carried out for 3 years. Then we follow their development during this period with the analysis of the results.Item Performance Analysis Of Methods For Estimating Weibull Parameters For Wind Speed Distribution In The District Of Maroua(University of Eloued جامعة الوادي, 2014-07-01) Kidmo Kaoga, D.; Danwe, R.; Doka Yamigno, S.; Djongyang, N.In this study, five numerical Weibulldistribution methods, namely, the maximum likelihood method, the modified maximum likelihood method (MLM), the energy pattern factor method (EPF), the graphical method (GM), and the empirical method (EM) were explored using hourly synoptic data collected from 1985 to 2013 in the district of Maroua in Cameroon. The performance analysis revealed that the MLM was the most accurate model followed by the EPF and the GM. Furthermore, the comparison between the wind speed standard deviation predicted by the proposed models and the measured data showed that the MLM has a smaller relative error of -3.33% on average compared to -11.67% on average for the EPF and -8.86%on averagefor the GM. As a result, the MLM was precisely recommended to estimate the scale and shape parameters for an accurate and efficient wind energy potential evaluation.Item Fabrication, Morphological And Optoelectronicproperties Of Antimony On Porous Silicon As Msm Photodetector(University of Eloued جامعة الوادي, 2014-07-01) Hadi, H. A.We report on the fabrication and characterization of MSM photodetector. We investigated the surface morphological and the structural properties of the porous silicon by optical microscopy, atomic force microscope (AFM) and X-ray diffraction. The metal–semiconductor–metal photodetector were fabricated by using Sb as Schottky contact metal.The junction exhibits good rectification ratio of 105 at bias of 2V. A large photocurrent to dark-current contrast ratio higher than 55 orders of magnitude and low dark currents below 0.89 nA .High responsivity of 0.225A/W at 400 nm and 0.15 A/W at 400 and 700nm were observed at an operating bias of less than -2 V, corresponding quantum efficiency of 70% and 26% respectively. The lifetimes are evaluated using OCVD method and the carrier life time is 100 μs. The results show thatSb on porous silicon (PS) structures will act as good candidates for making highly efficient photodiodes.Item Electrochemical Determination Of Ethanol, 2- Propanol And 1-butanolon Glassy Carbon Electrode Modified With Nickel Oxide Film(University of Eloued جامعة الوادي, 2014-07-01) Benchettara, A.In this work, we present the modification of a glassy carbon electrode with nickel oxide film which is performed in two successive steps. In the first one, the electrochemical deposition of metallic nickel on the glassy carbon electrode (GCE) is achieved in 0.1M boric acid; in the second step, the metallic deposit is anodically oxidized in 0.1M NaOH. These two operations were carried out in a three electrode cell with a filiform platinum auxiliary electrode, a SCE as potential reference and a working microelectrode of modified glassy carbon with nickel oxides. This electrode is characterized by several electrochemical techniques and is used for the catalytic determination of ethanol, 2-propanol and 1-butanol in 0.1 M NaOH. The proposed chemical mechanism shows that NiO2 acts as a mediator.Item Evaluation Of The Leave And Bud Decoctions Pinus Halepensis Mill Effects On The Induced-phenol Renal Toxicity In Wistar Rats(University of Eloued جامعة الوادي, 2014-07-01) Berroukche, A .; Amara, S.; Halimi, S.; Benyamina, F.Pinus halepensis M. (Pinaceae) has done object many indications in traditional medicine. Several studies have demonstrated a protective activity of essential oils extracted from various plant species against renal toxicity induced by chemicals in the animal model. The objective of this study is to assess the anti toxic effects of decocted leaves and buds of Pinus halepensis M. on Wistar rats initially exposed to phenol C6H5OH (180 mg / kg body weight). The results of laboratory analyzes of biochemical parameters revealed that decocted leaves and buds (250 mg / kg body weight) have shown a highly significant antitoxic activity (p < 0,001). The protective effect of decocted leaves and buds were respectively expressed by a decrease in serum concentrations of biochemical markers urea ( 0,32 and 0,28 g/l) and creatinine ( 121 & 13,8 g / l ) and electrolyte Calcium ( 89,8 & 109,5 g / l ) , Potassium ( 7 & 6,6 g / l ) and Sodium ( 130,5 & 129,6 g / l ).Item Phytochemical Screening And Thrombolytic Activity Of Chloroform Extract Of Urena Sinuata (l.)(University of Eloued جامعة الوادي, 2014-07-01) Dibyajyoti S. . Swati P.The present study was designed to investigate thrombolytic properties of chloroform extract of Urena sinuata along with phytochemical study for the presence of phytochemical constituents. The concentrated extracts were collected and allow to air dry for complete evaporation of chloroform. Phytochemical analyses were found to be positive for carbohydrates and gum, reducing sugar, alkaloid, steroid, glycoside and flavonoids. The percent clot lytic activity was compared with water (positive control) and standard enzyme streptokinase (negative control). The mean percent clot lytic activity of chloroform leaf extract of Urena sinuata was found 47.89%, which is significant compare with the positive and negative control. The present study suggests that chloroform extract of Urena sinuata has significant thrombolytic activity.Item Study Of The Effect Of Aluminum Content And C / S Ratio On The Physico-mechanical And Thermal Properties Of A Lightweight Concrete Made From Sand Dune(University of Eloued جامعة الوادي, 2014-07-01) Damene, Z.; Goual, M. S.; Saiti, I.; Benhassine, N.; Ferhat, A.This research is a contribution to the development of local materials especially in the development of a cellular concrete with dunes sand. This is an experimental study whose objective is to see the influence of the C/S (dosage of cement compared to sand) and the dosage of aluminum on the physico- mechanical and thermal performance of lightweight concrete cellular type. The results showed that the cement compared to the sand has a remarkable effect on the reaction and that on expansion the mechanical behavior as well as the dosage of aluminum in the composition of cellular concrete has a certain threshold Aluminium beyond which provides no relief benefits. Based on these results, the cellular concrete made from sand dune can be classified as light structural concrete with insulation suitable for very hot and arid environment of our region power.Item Phytochemical Study And In Vitro Antimicrobial Activity Of Pistacialentiscusl. In Boumerdes Mountainous Region (algeria)(University of Eloued جامعة الوادي, 2014-07-01) Bendifallah, L.; Benmahfoud, A. E.; Hameni, Y.; Mameche, S.Pistacialentiscus L.(Pistaciaceae) is among themost important medicinalplantsin Algeria that is known for its antifungal and antimicrobial properties. For this study, the leaves were collected from the mountainous region of Boumerdes, in northern Algeria. In such a propitious context, the aim of this study was to enhance Pistacialentiscusas a medicinal herb. For their antimicrobial activity, extracts of tannin and polyphenols werescreenedagainst three pathogenic bacterial strains and one pathogenic yeast strains. The phytochemical analysis results showed a remarkable combination of chemical components including a high content in tannins, in leucoanthocyanins, in glucosids, alcaloids, flavonoïds and in saponosids. The tannins and the polyphenols have strong antimicrobial activity against some species.Item A Lixisol Microbial Activity Under Urban Wastes Composts Effect In Donsin, Burkina Faso(University of Eloued جامعة الوادي, 2014-07-01) Bambara, D.; Thiombiano, A.; Hien, V.Mineralization causes soil carbon loss. This study focuses soil microbial activity measurement in relation with the application of six types of composts in sorghum three-year experiment. Composts were applied single or combined with urea. Organic carbon content, microbial biomass, respirometry and carbon global mineralization rate were evaluated. In comparison to the control, single composts treatments parameters variation rates ranged from -1 to +71%. When composts were combined with urea, parameters variations rates ranged from -8 to +107%. Under single urea, these parameters variation rates ranged from -14% to +31%. Best composts seemed to be those produced with various and balanced composting materials. Eco-friendly composts adoption could improve soil organic carbon content for sustainable microbial process.