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Search Results: 1 - 10 of 197856 matches for " N. Boulenouar "
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Effect of Some Poisonous Plants Extracts on Fusarium oxysporum f. sp. albedinis
N. Boulenouar,A. Marouf,A. Cheriti
Journal of Biological Sciences , 2009,
Abstract: In the present study, four poisonous plants from the Algerian Sahara (South-West of Algeria): Citrullus colocynhis (L.) Schrad, Calotropis procera Ait., Nerium Oleander, Pergularia tomentosa were used to evaluate their extracts for antifungal activity against Fusarium oxysporum f. sp. albedinis (Foa), the causal agent of the most dangerous disease of date palm (Phoenix dactylifera L.). Two parts from each plant were used for extraction by four solvents: methanol, ethyl acetate, dichloromethane and hexane. The antifungal test was realized using disc diffusion technique and Relative Virulence (RV) test (on potato tuber tissue). For both tests, four extract quantities were used (200, 400, 800 and 1600 μg). The relative virulence was presented as necrotic tissue weight (mg) of potato tuber tissue. Among all solvents, methanol gave the best extraction yield (mean: 13.24%, minimum: 8.46%, maximum: 21.91%). The results of disc diffusion assay showed that the most important effect on Foa was observed for hexanic extract of Pergularia tomentosa (stems), methanolic extracts of Citrullus colocynthis (leaves and stems) and Nerium oleander (leaves, stems). The virulence test showed a decrease in RV below 50% for methanolic and dichloromethanic extracts of Citrullus colocynthis (leaves and stems). Coupling the effect of plants extracts on Foa growth and virulence, Citrullus colocynthis extracts showed great efficacy than did other plants.
Temporal Epilepsy Causing Recurrent Abdominal Pain in Adults  [PDF]
Hassan Al-Hail, Stacy Schantz Wilkins, Boulenouar Mesroua, Gayane Melikyan, Nabil Azar, Naim Haddad, Basim Uthman, Maria Siddiqi, Ameer Jan, Rana Babur, Abdulraheem Alrabi, Dirk Deleu, Gonzalo Alarcón
World Journal of Neuroscience (WJNS) , 2018, DOI: 10.4236/wjns.2018.82021
Abstract: Abdominal epilepsy is often unrecognised as an epilepsy condition, particularly in adults. We present a rare adult patient who suffers daily episodes of abdominal pinching pain described lasting for 30 seconds, often evolving to loss of consciousness. Scalp EEG-video monitoring showed interictal left temporal slowing and frequent left temporal epileptiform discharges. Three stereotypical complex partial seizures consistent with her habitual attacks were recorded. Two seizures showed a left temporal onset and whereas the third one appeared to start on the right temporal lobe. In patients with paroxysms of abdominal pain, nausea or vomiting, abdominal epilepsy should be considered after exclusion of the most common aetiologies for gastrointestinal conditions.
Effects of temperature, pH-values and sodium chloride concentrations on the glucose-6-phosphate dehydrogenase activity by thermotolerant Bacillus strains
HAZEM AQEL,FAROUK AL-QUADAN,NOUREDDIN BOULENOUAR
Journal of BioScience and Biotechnology , 2012,
Abstract: Thirteen new isolated thermotolerant Bacillus strains and four known Bacillus species were used to evaluate the effect of growth temperature, pH-values and NaCl concentrations on the intracellular glucose-6-phosphate dehydrogenase (G6PDH) activity. Results had shown a significant difference in G6PDH production among all species at all used temperatures (p<0.05). The response of individual new isolates and controls for production of G6PDH under growth conditions was variable. The optimal growth conditions did not correspond to the optimal cultivation conditions for maximum G6PDH production. The growth temperature showed the most significant effect on G6PDH activity. The combined effect of temperature and NaCl on the G6PDH activity was strongly pronounced in comparison with the combined effect of temperature and pH or pH and NaCl. Thermal stability at 53oC and electrophoretic mobility were also investigated. G6PDH from HUTB41 was the most thermostable G6PDH enzyme with T50% of more than 360 minutes. Electrophoretic study demonstrated that G6PDH was composed of two isoenzymes for all strains except B. marinus and B. schlegelii that had three isoenzymes.
Effect of Various Combinations of Growth Temperature, pH and NaCl on Intracellular Activities of G6PDH and 6PGDH from Four Bacillus strains isolated from Jordanian Hot springs
Noureddin Boulenouar,Farouk Al-Quadan,Hazem Akel
Journal of Biological Sciences , 2006,
Abstract: Intracellular glucose-6-phosphate dehydrogenase (G6PDH) and 6-phosphogluconate dehydrogenase (6PGDH) from Bacillus schlegelii, Bacillus sphaericus, Bacillus marinus and Bacillus circulans were variably sensitive to growth conditions (temperature, pH and NaCl) and so were G6PDH and 6PGDH within the same strain. Thermostability of 6PGDH and G6PDH vary among the studied species; the difference in thermostability between the more stable G6PDH and the less stable 6PGDH from the same species may compensates the lower G6PDH and the higher 6PGDH activity found in this study. These results may indicate the existence of separate regulatory pathways for the two enzyme activities; one pathway may be related to thermostability and other pathways may be related to other growth conditions of pH and NaCl.
Ataxia hemiparética en un infarto lacunar lentículo-capsular con evolución favorable: Algunas consideraciones fisiopatológicas
DELEU,DIRK; RUIZ M,FRANCISCO; AL BADRI,MINA; AKHTAR,NAVEED; D'SOUZA,ATLANTIC; MESRAOUA,BOULENOUAR;
Revista médica de Chile , 2010, DOI: 10.4067/S0034-98872010000200011
Abstract: hemi paretic ataxia (ha) is a lacunars syndrome that presents with motor deficit and pyramidalism associated to ipsilateral ataxia out of proportion to such deficit. topography of lesions is wide and acute infarcts have been recognized at the infernal capsule, pons, thalamus, corona radiate and cortex. symptoms are associated to involvement of pyramidal and corticopontocerebellar tracts. we report a 44-year-old mole presenting with right hemi paresis and severe ataxia. the magnetic resonance imaging showed a sub acute infarction of the left lenticular nucleus and infernal capsule. the patient was treated with physiotherapy, anti platelet agents and statins and was discharged with an evident recovery.
Implementation of a Higher Quality dc Power Converter  [PDF]
N. N. Barsoum
Journal of Electromagnetic Analysis and Applications (JEMAA) , 2010, DOI: 10.4236/jemaa.2010.22012
Abstract: Many single and three-phase converters are well developed, and covered up in most of electric markets. It is used in many applications in power systems and machine drives. However, an exact definite output signal from the dc side still not recognized. The waveforms of output voltage and current demonstrate an imperfect dc signal and constitute losses, harmonic distortion, low power factor, and observed some ripples. An approximately perfect rectifier bridge is the aim of this research. Perhaps it gives the ability to identify the parameters of the converter to obtain, as much as possible, a perfect dc signal with less ripple, high power factor and high efficiency. Design is implemented by simulation on Power Simulator PSIM, and practically, a series regulator LM723 is applied to provide regulating output voltage. Comparisons of both simulation and hardware results are made to observe differences and similarities.
Estimation of Sensitivity of the DS/AHP Method While Solving Foresight Problems with Incomplete Data  [PDF]
N. Pankratova, N. Nedashkovskaya
Intelligent Control and Automation (ICA) , 2013, DOI: 10.4236/ica.2013.41011
Abstract:

The paper provides mathematical analysis of sensitivity of different combination rules in the DS/AHP method when an alternative is added to the set of decision alternatives while solving foresight problems. Different cases of rank reversals are defined and two sets of conditions for these cases using the method DS/AHP are considered. Rank reversals are illustrated when the DS/AHP method is used to solve practical problem of critical technologies of energy conservation and power efficiency evaluation in Ukraine. It is shown that the DS/AHP method is not sensitive to exclusion (or addition) of an irrelevant decision alternative from (or to) the set of decision alternatives.

Computation of the Genetic Code: Full Version  [PDF]
N. N. Kozlov
Journal of Computer and Communications (JCC) , 2017, DOI: 10.4236/jcc.2017.510008
Abstract: One of the problems in the development of mathematical theory of the genetic code (summary is presented in [1], the detailed—to [2]) is the problem of the calculation of the genetic code. Similar problem in the world is unknown and could be delivered only in the 21st century. One approach to solving this problem is devoted to this work. For the first time a detailed description of the method of calculation of the genetic code was provided, the idea of which was first published earlier [3]), and the choice of one of the most important sets for the calculation was based on an article [4]. Such a set of amino acid corresponds to a complete set of representation of the plurality of overlapping triple gene belonging to the same DNA strand. A separate issue was the initial point, triggering an iterative search process all codes submitted by the initial data. Mathematical analysis has shown that the said set contains some ambiguities, which have been founded because of our proposed compressed representation of the set. As a result, the developed method of calculation was reduced to two main stages of research, where at the first stage only single-valued domains were used in the calculations. The proposed approach made it possible to significantly reduce the amount of computation at each step in this complex discrete structure.
The Study of the Secrets of the Genetic Code  [PDF]
N. N Kozlov
Journal of Computer and Communications (JCC) , 2018, DOI: 10.4236/jcc.2018.67007
Abstract: The disclosure of many secrets of the genetic code was facilitated by the fact that it was carried out on the basis of mathematical analysis of experimental data: the diversity of genes, their structures and genetic codes. New properties of the genetic code are presented and its most important integral characteristics are established. Two groups of such characteristics were distinguished. The first group refers to the integral characteristics for the areas of DNA, where genes are broken down in pairs and all 5 cases of overlap, allowed by the structure of DNA, were investigated. The second group of characteristics refers to the most extended areas of DNA in which there is no genetic overlap. The interrelation of the established integral characteristics in these groups is shown. As a result, a number of previously unknown effects were discovered. It was possible to establish two functions in which all the over-understood codons in mitochondrial genetic codes (human and other organizations) participate, as well as a significant difference in the integral characteristics of such codes compared to the standard code. Other properties of the structure of the genetic code following from the obtained results are also established. The obtained results allowed us to set and solve one of the new breakthrough problems—the calculation of the genetic code. The full version of the solution to this problem was published in this journal in August 2017.
Guidelines for Optimization of the Absorber Layer Energy Gap for High Efficiency Cu(In,Ga)Se2 Solar Cells  [PDF]
N. Severino, N. Bednar, N. Adamovic
Journal of Materials Science and Chemical Engineering (MSCE) , 2018, DOI: 10.4236/msce.2018.64015
Abstract: This work investigates in-depth the effects of variation of the compositional ratio of the absorber layer in Cu(In,Ga)Se2 (CIGS) thin-film solar cells. Electrical simulations were carried out in order to propose the most suitable gallium double-grading profile for the high efficiency devices. To keep the model as close as possible to the real behavior of the thin film solar cell a trap model was implemented to describe the bulk defects in the absorber layer. The performance of a solar cell with a standard CIGS layer thickness (2 μm) exhibits a strong dependence on the front grading height (decreasing band gap toward the middle of the CIGS layer). An absolute gain in the efficiency (higher than 1%) is observed by a front grading height of 0.22. Moreover, simulation results show that the position of the plateau (the region characterized by the minimum band gap) should be accurately positioned at a compositional ratio of 20% Ga and 80% In, which corresponds to the region where a lower bulk defect density is expected. The developed model demonstrates that the length of the plateau is not playing a relevant role, causing just a slight change in the solar cell performances. Devices with different absorber layer thicknesses were simulated. The highest efficiency is obtained for a CIGS thin film with thicknesses between 0.8 and 1.1 μm.
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