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Les oasis de l'Oued Noun: dégradation du milieu naturel et perspectives de développement
EL MAHJOUB CHMOURK
Cinq Continents , 2011,
Abstract: The oases of Oued Noun: degradation of the natural environment andperspectives of development. An oasis is considered as a vital space and a fundamental natural resource in the Oued Noun area. Irrigation water scarcity, desertification, terminal illnesses of different civilizations, space division and tininess of farms are all natural and economic constraints providing the oasis area from growing and developing. Officials have to be aware of those constraintsand they need to urgently recommend solutions in the process of updating the local territory and in its potentialities valorisation.
Le Sahara marocain : désenclavement et développement durable
EL MAHJOUB CHMOURK
Cinq Continents , 2012,
Abstract: Theenclosing of the Moroccan Sahara results from the inversion and old situation.Indeed, during a very long time, the area was a way of passage, a platform in thesouth of Morocco. In testify the Tran-Saharan commercial routes, which were themain transportation routes back in time, like the goal of integration of the area inthe country and compared to western Africa. It is with the economic crisis, and even a political crisis causing a fold on itself of this area until 1975.Since Sahara belongs to Morocco, it still profits a considerable public effort to carry out its opening-up and its economic insertion within the country. Massive investmentscarried out by the State give to the area the structuring which it missed. Which are the aspects of the Sahara development? Which role played the State in this development? The intervention of the State contributes to bring effectivesolutions to the problem of the opening-up of this surrounding space?
Watermelon Sudden Decay in Tunisia: Identification of Pathogenic Fungi and Determination of Primary Agents
Naima Boughalleb,Mohamed El Mahjoub
Pakistan Journal of Biological Sciences , 2006,
Abstract: Isolation from infected watermelon samples has demonstrated the presence of some fungal complex including Fusarium oxysporum, F. solani, Rhizoctonia bataticola, R. solani, Monosporascus cannonballus, Pythium ultimum and P. echinulatum. These fungal species are different in their distribution among the infected plants and areas surveyed. However, F. oxysporum and F. solani are always predominant. These results showed the almost-presence of the two Fusarium disease of watermelon: Fusarium wilt to F. oxysporum f. sp. niveum and the collars and/or root rot caused by F. solani f. sp. cucurbitae which are the primary fungi of sudden wilt. Analysis in main component of isolation frequency of different fungi showed that their association in homogeneous groups seemed not affected by geographic origin and surveyed year.
In vitro Determination of Fusarium spp. Infection on Watermelon Seeds and their Localization
N. Boughalleb,M. El Mahjoub
Plant Pathology Journal , 2006,
Abstract: In this study, we used direct incubation of watermelon dissected seeds on Komada`s selective medium for Fusarium spp. and incubation of entire seed on the same medium or on 2% agar medium. Identification of fungi was based on morphological criteria and also according to Koch`s postulate. Isolates from dissected seed were identified as F. oxysporum f. sp. niveum and F. solani f. sp. cucurbitae. These fungi were found to be externally and internally seed borne in watermelon. This is the first report of localization of Fusarium spp. transmitted by watermelon seeds in Tunisia.
Effet de la solarisation sur Phytophtora nicotianae Breda de Haan var. parasitica (Dastur) G.M. Waterhouse responsable d'un syndrome associant nécroses racinaires et flétrissement sur piment (Capsicum annuum L.) en Tunisie
Boughalleb, N.,El Mahjoub, M.
Tropicultura , 2005,
Abstract: The Effect of Soil Solarization on Phytophtora nicotianae Breda de Haan var. parasitica (Dastur) G.M. Waterhouse Responsable for Syndrome Associating Root Rots and Damping-off of Pepper (Capsicum annuum L.) in Tunisia. Mycological analysis of soil collected from solarized plot and non solarized plot showed that the inoculum of soil is composed mainly by Fusarium spp. The solarization permitted to reduce the density of this inoculum. Isolations done from peppers wilted plants have revealed the infestation by Phytophtora nicotianae Breda de Haan var. parasitica (Dastur) G.M. Waterhouse. This was on the basis of microscopic observation of different structures. It is assumed that the percentage of wilted plant showed a considerable reduction in solarized plot. In the same time, the impact of the solarization on the agronomic criteria showed an improvement of the vigour and also of the yield.
Combinatorial optimization algorithms for intelligent vehicle sequencing problem at an isolated intersection
Fei Yan,Mahjoub Dridi,Abdellah EL Moudni
International Journal of Combinatorial Optimization Problems and Informatics , 2012,
Abstract: With the development of telecommunication and miniaturization technology, advantages brought by intelligent vehicles are more and more studied for designing new traffic control systems. In this paper, we present a novel vehicle sequencing strategy at an isolated intersection based on the information received from approaching intelligent vehicles. A Branch and Bound algorithm and an efficient heuristic are proposed to find an optimal or approximate vehicle passing sequence. The objective is to improve the congestion by minimizing the overall vehicle evacuation time. Structural properties are carefully analyzed to simplify the search procedure. Computational experiments and simulations are also carried out to evaluate the performance of the proposed algorithms.
Présence en Tunisie d'isolats de Fusarium sambucinum résistants aux benzimidazoles : développement in vitro et agressivité sur tubercules de pomme de terre
Daami-Remadi M.,El Mahjoub M.
Biotechnologie, Agronomie, Société et Environnement , 2006,
Abstract: Presence in Tunisia of Fusarium sambucinum isolates resistant to benzimidazoles: in vitro growth and aggressiveness on potato tubers. The behaviour of 55 isolates of Fusarium spp. causing dry rot of the potato tubers, is studied against some enzimidazoles fungicides. Tunisian isolates of F. solani (12), F. oxysporum (23) and F. graminearum (10) are sensitive in vitro to carbendazime and benomyl at 5 mg.l-1. Their interaction with thiophanate-methyl is different; a complete inhibition of their mycelial growth is observed at doses higher than 500 mg.l-1. Tunisian isolates of F. sambucinum collected during 2002, 2003 and 2004 are resistant to these benzimidazoles showing existence of a cross-resistance. In fact, these isolates tolerated carbendazime (and benomyl) at 200 mg.l-1 and thiophanate-methyl at 1000 mg.l-1. This is the first study in Tunisia indicating emergence of this type of F. sambucinum resistance. Control isolates of F. sambucinum and those treated with carbendazime at 100 mg.l-1 showed a similar aggressiveness on potato tubers of the Spunta cultivar.
Variability in Pathogenicity among Tunisian Isolates of Phytophthora cactorum as Measured by Their Ability to Cause Crown Rot on Four Apple Cultivars and MM106 Roostock
N. Boughalleb,A. Moulahi,M. El Mahjoub
Journal of Agronomy , 2006,
Abstract: Studies on two isolates of Phytophthora cactorum recovered from apple plants identified the presence of diversity in pathogenicity. These isolates appeared pathogenic to tested apple trees. It revealed that Golden Delicious, Star Crimson and the rootstock MM106 were more susceptible than Richared and Red Delicious cultivars, but with variable levels of aggressiveness according to physiological stages of tested segments of apple plants. Necrosis caused by Phytophthora cactorum isolates was more important on shoot segments than on wood segments.
Congenital spinal tumor in a patient with encephalocele and hydrocephalus: a case report
Farid Radmanesh, Farideh Nejat, Fatemeh Mahjoub, Mostafa El Khashab
Journal of Medical Case Reports , 2011, DOI: 10.1186/1752-1947-5-9
Abstract: We report the case of an Iranian girl with a history of encephalocele surgery, who, at the age of four years, developed an intramedullary spinal teratoma, and discuss the pathogenesis of this association.To the best of our knowledge, this is the first report of an association between encephalocele and spinal teratoma.Encephalocele refers to a group of rare congenital anomalies of the central nervous system (CNS), where brain tissue protrudes from a defect in the skull [1]. Its prevalence has been estimated to be 0.8 to four in every 10,000 live births [2].Teratomas are tumors derived from all three germ layers [3]. In children, teratomas are more commonly found in the sacrococcygeal region than in the spinal cord [4], which occurs in one of 38,500 viable births. Intramedullary spinal teratomas are rare tumors [5]. In 41.7% of teratomas, a concomitant anomaly of the vertebral canal is found, most commonly a diastematomyelia, [4]. However to the best of our knowledge, there is nor repot of an association with encephalocele in the English literature.We report a case of encephalocele and lumbar intramedullary teratoma and discuss the possible etiology.A four-year old Iranian girl was referred to the neurosurgical department with severe back pain and motor regression. She was the second child of nonconsanguineous parents, and was delivered by elective Cesarean section due to being repeat. She had a history of occipital encephalocele, which was treated surgically during the neonatal period and she later received a shunt to treat progressive hydrocephalus. She could sit at nine month of age and stand at two years, but was unable to walk. Six months before her referral, she had developed back pain, which was particularly severe at night, and after three months, she was unable to stand.On physical examination, our patient was found to be generally normal, with good mental performance, and normal results from a neurological examination of the arms. She had a head circumferenc
Effets de certains fongicides de synthèse et biologiques sur la croissance mycélienne et l'agressivité de Fusarium oxysporum f.sp. radicis-lycopersici
Hibar, K.,Daami-Remadi, M.,El Mahjoub, M.
Tropicultura , 2007,
Abstract: Effect of some Chemical and Biological Fungicides on Mycelial Growth and Disease Severity of Fusarium oxysporum f.sp. radicis-lycopersici. Fusarium is among the most aggressive telluric fungi causing wilt and root rots in several vegetable crops. A new disease caused by Fusarium oxysporum f. sp. radicis-lycopersici was recorded in southern Tunisia in the "Cinquième Saison" farm, situated in Hammet Gabès during 2000-2001 crop season. It caused death of up to 90% of tomato plants in some greenhouses. In the present research, the effect of 3 chemical and 4 biological fungicides was tested in vitro on mycelial growth and in vivo on disease severity of F. oxysporum f. sp. radicis-lycopersici. Hymexazol, benomyl and manebe were used as chemical fungicides whereas four biological products, i.e. two based on Trichoderma harzianum, one on Bacillus subtilis and another one on Bacillus thuringiensis were also tested. Among the chemical fungicides which were used, hymexazol and benomyl were the most effective in vitro and inhibited mycelial growth up to 80%. However, in vivo assays showed that only hymexazol was effective with a reduction in disease incidence of about 76%. In vitro, the product based on B. thuringiensis entailed a mycelial growth inhibition of less than 20%. This value is more than 75% higher than what was obtained through the other biological fungicides based on either T. harzianum or in B. subtilis. The efficacy of the latter 2 biological fungicides was more important in vivo assays using inoculated tomato plants. Indeed, by the use of the product based on B. subtilis, the reduction of disease incidence exceeded 95%. These results show that some biological fungicides can be used in controlling Fusarium crown and root rot of tomato.
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