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Articles by M. Benkhelifa
Total Records ( 4 ) for M. Benkhelifa
  A. Mekhaldi , M. Benkhelifa and M. Belkhodja
  In this study, we have put in a experimental pot, a plant of Mung bean (Vigna radiata L. Wilczek), this latest is subjected to salinity stress (NaCl + CaCl2) during four stages of its growth (juvenile stage (5 leaves), flowering stage, after flowering stage and pod setting). Three concentrations of salt solution 100, 200 and 300 meq L-1 and the control (Hoagland solution) were used in irrigation. Exchangeable oxygen was determined in leaf discs and isolated chloroplasts of the stressed plants during respiration and photosynthesis processes. Results indicated that the quantity of the exchangeable oxygen during respiration increases with the increase of salinity concentration. Contrarily, the exchangeable oxygen during photosynthesis decreased with increasing salinity concentration.
  A. Tadja , M. Youcef Benkada , M. Rickauer , B.S. Bendahmane and M. Benkhelifa
  It is the weakness of works on this pathogenic agent that pushed us to characterize Ascochyta on the plans morphological and molecular. Thirty seven samples of biological materials were isolated from three zones i.e., Mostaganem, Relizane and Mascara all located at North-West of Algeria. The samples are the isolated strains and are obtained from various organs of pea seedlings attacked by Ascochyta sp. According to the morphological aspect, the results allowed to distinguish between three categories of strains representing the three species. Nevertheless, the distinction between these three categories is not very reliable for cause of the extreme variability of these species according to their middle of culture. According to the molecular data, all the isolated-strains who’s Internal Transcript Space (ITS) regions in DNA have been amplified by Polymerase Chain Reaction (PCR) have expressed identical results with the same size of the PCR products (550 Pb). No polymorphism is noted at the set of the tested strains. On the other hand, the molecular sequencing permitted to distinguish Ascochyta pisi from Ascochyta pinodes and Ascochyta pinodella. These last two species remain similar in their ITS1 and ITS4 regions and don't show any difference. This study was done at the North-West of Algeria between 2004 and 2008. The prospection of other DNA regions with other molecular markers is to be planned in order to detect polymorphism between Ascochyta pinodes and Ascochyta pinodella.
  C. Benaouina , T. Kadri , H. Khelafi and M. Benkhelifa
  In this research, we studied the properties of a brick locally manufactured to basis of kaolinite of Aïn Nouissy (Northwest of Algeria) in order to improve its qualitative properties in the physical and mechanical plans. Two actions on the natural material, the grinding and the ageing, us one permitted to improve strongly, the physical properties of the paste clayey and mechanical of the finished brick. Indeed, the grinding while acting on the granulometry of the natural material, increase the colloidal fraction while dispersing the present aggregations. It follows that the paste clayey becomes more disposed to undergo the effects of the ageing that improve strongly, the shrinkage of the material. The compactness of the material was improven and the resistance to traction and to the compression of the brick finished is doubled in relation to the witness who was not subject to the treatments of grinding and ageing. One of the important results of this survey is that it is practically sufficient to inject in the production line an ageing of 3 weeks of the paste of the kaolin accompanied by a preceding grinding of the material during 60 min to double the performances of the brick of Aïn Nouissy.
  M. Benkhelifa , M. Belkhodja , Y. Daoud and D. Tessier
 

This research has for object to study the influence of clay addition, i.e., Maghnian bentonite, like deposit clay, in the physical properties of sandy materials from Mostaganem plateau (North-West Algeria) submitted to salinity and sodicity. The first result was to show that the clay content changes drastically the physical properties of clay-sand mixtures. Important differences were observed as a function of the sand particle size distribution. At given clay content, the saturated Hydraulic Conductivity (HCs) was lower when the sand size was small and spread. For the coarse sand the salinity was maintained, even for high clay contents, a significant hydraulic conductivity. One of the main characteristics of Maghnia clay is the presence of calcium carbonates in the natural material. In comparison to that of Mostaganem clay of other deposit, it appears less sensitive to sodicity. An important aspect is the initial state of the clay when used in addition to sands, i.e., disturbance, conditions of preparation of sand clay mixtures and presence of associated components such as carbonates. Maghnia clay appeared to be adapted to the improvement of sandy soils, not because its mineralogical characteristics, but for its natural cationic form and obviously the presence of calcite in it.

 
 
 
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