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Article original Incidence du streptocoque du groupe b (sgb) chez les nouveau-nés nés à Constantine (Algérie) et dans deux de ses banlieues. Intérêt de la détermination des sérotypesIncidence of group b streptococcus (gbs) in neonates born in Constantine (Algeria) and two of its suburbs usefullness of serotyping
(elsevier, 2003-08) M. A. HAMIDECHI
Aim. – Group B Streptococcus (GBS) is the germ most often responsible for neonatal infections. Several risk factors are described. The objective of this investigation was to demonstrate the effects of age, sex, and place of birth in neonates GBS infection, including serotype distribution. Method. – A 4 years-long multicentric study was carried out in Constantine and 2 of its suburbs, including 8,711 live neonates. Seven hundred and thirty-three suspected infections were recorded and sorted according to postnatal age (≤ 7 days and > 7 days), sex, and place of birth (related to the mothers’ socioprofessional status). Thirty-one cases of GBS infection were confirmed. Results. – GBS was identified in 53 out of 733 suspected cases of infection (i.e.: 7.2% or 1/14 suspected case). The incidence of early GBS infection was greater than late onset (36 vs 17 out of 53 cases). GBS colonization was not related to age. High socioprofessional status decreased the infection risk significantly in neonates. Conclusion. – This study demonstrates that favorable hygiene and the mother’s high socioprofessional status decrease the risk of neonatal GBS infection
Présence de Dasypoda maura Perez, 1895, en Algérie (Hym., Apoidea, Melittidae)
(researchgate, 2007-01) Maghni Noudjoud
Les Hyménoptères Melittidae, notamment ceux du genre Dasypoda Latreille, 1802, sont très répandus dans la région paléarctique. Cependant, les travaux se rapportant à l’Algérie et qui datent de la première moitié du 20e siècle mentionnent uniquement la présence de 6 espèces : Dasypoda brevicornis (Rossi, 1791), D. hirtipes (Fabricius, 1793), D. plumipes (Panzer, 1797), D. cingulata Erichson, 1835, D. sinuata Pérez, 1855 et D. oraniensis Perez, 1895 (SAUNDERS, 1901, 1908 ; ALFKEN, 1914 ; BENOIST, 1924, 1961 ; MORICE, 1916 ; ROTH, 1923, 1924 ; SCHULTHESS, 1924). Dans les travaux les plus récents, LOUADI & DOUMANDJI (1998 a et b) ont noté l’absence des Melittidae dans la région de Constantine. En 2003, MATALLAH relève dans la région de Skikda (36°53’ N, 6°55’ E, 42 m) la présence de Dasypoda visnaga Rossi, 1790, qui présente une distribution méditerranéenne. Au cours de nos prospections menées du 3 juin au 17 juillet 2005 dans la wilaya de Khenchela, plus exactement au mont Chelia à 2176 m (35°20’ N et 60°39’ E, nous avons récolté 24 spécimens de D. maura Perez, 1895, qui n’était connue jusqu’à présent que du Maroc (MICHEZ et al., 2004 a, b). Cette espèce fréquentait deux plantes spontanées de la famille des Asteraceae (Sylibum marianum L., 6 spécimens, et Echinops spinosus L., 18 spécimens). Cette présence au mont Chelia montre sans aucun doute que cette espèce nouvelle pour l’Algérie a une répartition plus large. D’autres investigations en cours dans des régions limitrophes nous renseigneraient certainement davantage sur sa distribution géographique.
Les Hyménoptères Apoidea de l’Algérie orientale avec une liste d'espèces et comparaison avec les faunes ouest-paléarctiques
(researchgate, 2008-01) Noudjoud MAGHNI
Hymenoptera Apoidea of eastern Algeria and comparison with western Palaearctic fauna. Our own investigations in North Eastern Algeria and data from other authors revealed the presence of 382 species of Bees belonging to 55 genera.These species were distributed into six families: Colletidae (2 genera, 25 species), Melittidae (3 genera, 9 species), Halictidae (8 genera, 60 species), Andrenidae (5 genera, 77 species), Apidae (17 genera, 111 species) and Megachilidae (20 genera, 100 species). Compared to the west Palaearctic fauna, long tongued Bees were more represented with 211 species against 171 for those with a short tongue in Algeria. In West Palaearctic the short tongued Bees constituted the majority: 253 species in Baden-Wurtenberg (Germany) against 137 long tongued species. There is a greater number of Megachilini and Osmiini (Megachilidae) in Algeria whereas in Western Europe, Bumblebees of the genus Bombus (Bombini, Apidae) are the most diverse.
Etude microbiologique au niveau d'une station d'Epuration "Step Timgad"
(Abbes Laghrour University- Khenchela, 2010) Abdessemed, Zineb
Water is self-purified by activated sludge process which makes its uniqueness. The main goal of this thesis is the microbiological and physico-chemical study of the input and output water of the wastewater treatment system plant Timgad. 89.47% of the identified biocenosis belongs to ɤ- Proteobacteria while the remaining 10.52% is equally divided between α- Proteobacteria and β- Proteobacteria. The antibiotics susceptibility profiles reveal that over 30% are wild strains while the penicillinases are often present (11.30-20%) with also other profils. The excess of oxygyen injected prevents last denitrification step but the physico-chemical quality of treated water is good for all tested parameter. L’eau est une substance unique parce qu’elle s’auto-épure par le processus de boues activées. L’objectif principal de ce mémoire est l’étude microbiologique et physico-chimique des eaux en amont et en aval dans la station d’épuration de Timgad. Il s’est avéré que 89.47% de la biocénose microbienne identifiée appartient aux ɤ- Proteobacteria, alors que α- Proteobacteria et β- Proteobacteria sont à égalité avec 5.26%. Les profils d’antibiogrammes dévoilent que les souches sauvages ont eu des pourcentages supérieurs à 30%, les bactéries pénicillinases sont souvent présente [11,30-20%] ainsi que d’autres profils. L’excès de l’oxygène injecté empêche la dernière étape de dénitrification, mais la qualité physico-chimique des eaux traitées a était bonne pour touts les paramètres analysés.
Étude du profil épidémiologique et des facteurs de risque alimentaires du cancer du nasopharynx dans le Nord-Est algérien
(springer, 2010-12-06) BENDJEMANA KATIA
Nasopharyngeal carcinoma (NPC) is one of the most important cancers in Algeria with 8 to 12 cases/ 100,000 persons a year. The pathogenesis of NPC is not clear. In Algeria and Tunisia, it represents the first most common cancer of the larynx in women and the second most common tumor inmen. This is a retrospective epidemiological study of the NPC in the North-East of Algeria and evaluates the impact of the consumption of some foods, tobacco and alcohol on the risk of development of NPC. The study of a group of 160 patients affected by NPC, using 205 people as a control group, has shown that this cancer was predominant in men, particularly in the population between 40- and 59-years-old. The analysis has shown that preservatives such askhliiseem to be a statistically significant factor related to NPC. Our results also show a strong association between alcohol consumption and tobacco use and the risk of developing NPC. However, we did not find a statistically significant relationship with other food factors. Résumé Le carcinome du nasopharynx (CNP) représente un des cancers les plus importants dans notre pays, avec une incidence moyenne de 8 à 12 cas/100 000 habitants par an. Il représente en Algérie et en Tunisie le premier cancer des voies aérodigestives chez la femme et le deuxième après le cancer du larynx chez l’homme. L’étiologie de ce cancer incrimine trois types de facteurs: le facteur viral, les facteurs génétiques et environnementaux, notamment alimentaires et tabagiques. Le but de notre travail rétrospectif est d’évaluer le profil épidémiologique du cancer du nasopharynx au niveau des régions de Khenchela et de Batna et leurs environs et d’identifier les aliments à risque pour le CNP. L’étude a concerné 160 patients ayant un CNP de type UCNT (undifferentiated carcinoma of nasopharyngeal type) recensés dans les régions et 205 témoins appariés aux malades selon l’âge, le sexe et la région géographique. Les résultats montrent que ce cancer prédominait particulièrement chez les hommes, avec une forte incidence pour la tranche d’âge de 40 à 60 ans. L’analyse des facteurs alimentaires et tabagiques montre un risque élevé de CNP lié significativement à la consommation de produits de conservation traditionnelle tels que le khlii et les saumures. Nos résultats montrent aussi une forte association entre la consommation d’alcool et de tabac et le risque de développement du CNP. Cependant, cette association n’a pas pu être démontrée pour le reste des aliments faisant l’objet de notre étude.
Contribution à l'étude d'un agent microbien auto-épurateur de l'eau isolée d'un écosystème aquatique continental de la région de khenchela
(Abbes Laghrour University- Khenchela, 2011) Merradi, Manel
L’eau comme tout autre élément dans la nature est un bon serviteur de l’homme mais celui-ci n’est pas un bon maître par ses extensions urbaines et ses déchets biologiques, il provoque une pollution microbienne de cette source précieuse de vie. Le volume d’eau potable et pure devient de plus en plus insuffisant et ne couvre pas les besoins vitaux. En effet, l’eau est dotée d’un pouvoir auto-épurateur naturel qui maintient l’équilibre écologique. Cette capacité d’autoépuration de l’eau est l’œuvre des microorganismes. L’évaluation de la qualité physicochimique et bactériologique était l’objectif de notre étude réalisée sur les eaux usées de la station d’épuration de la wilaya de Khenchela ainsi la contribution à isoler un agent microbien autoépurateur (Bdellovibrio bacteriovorus) de ces eaux. Le dénombrement des germes indicateurs de contamination microbienne exprime leur présence avec un grand pourcentage et indique une contamination fécale d’origine humaine. L’isolement de bactéries présentes dans ces eaux nous a permis de trouver des bactéries à Gram négatif comme Escherichia coli, Aeromonas hydrophila, Klebsiella pneumoniae, Pantoea spp et Pseudomonas aeruginosa ainsi que des bactéries à Gram positif comme Staphylococcus epidermidis. Bdellovibrio bacteriovorus n’a pas été isolée de ces eaux et donc on n’a pas pu étudier son pouvoir lytique envers Escherichia coli isolée.
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.
Some Physiological and Biochemical Effects of NaCl Salinity on Durum Wheat (Triticum durum Desf.)
(Advances in Biological Research, 2011) Azzedine Fercha
Abstract: The main objective of this study was to examine the effects of NaCl on the leaf growth and some physiological and biochemical characteristics of an Algerian durum wheat (var. Waha) landrace. NaCl (150 mM),as compared to control plants, significantly reduced all the leaf-growth parameters as leaf area (33%), leaf dry weight (41%) and leaf fresh weight (32%), but did not induce any change in the leaf succulence and, consequently, in the leaf RWC. On the other hand, NaCl salinity induced the accumulation of proline (2.25 fold, P<0.05) and soluble sugars (60%, P<0.01) in the leaves of durum wheat seedlings. However, while photosynthetic pigments content do not undergo important change, total carotenoids content decreased (14%) under salt stress conditions. NaCl treatment enhanced significantly the accumulation of H2O2 (4.0-fold, P<0.01) and led to lipid peroxidation. All of these parameters and the interaction among them were analyzed usingANOVA and multiple correlation analysis. The importance of the interactions between osmolytes andantioxidants in determining the salt tolerance of durum wheat was discussed.
Incidence de Listeria spp. et autres bactéries psychrotrophes dans le lait cru bovin dans le Nord Est Algérien
(researchgate, 2011-01) M. A. HAMIDECHI
In this study a total of 104 milk samples collected from 60 dairy cattle in six farms in the North East part of Algeria were examined for the presence of Listeria spp. and other psychrotrophic bacteria. The isolation was accomplished by cold storage of milk samples followed by plating on blood agar added of Cefazoline. The isolates were identified phenotypicaly by studying cultural, morphological, biochemical criteria; and genotypicaly using the 16S rRNA gene. Psychrotrophic bacteria from numerous genera have been isolated, both gram negative “Acinetobacter spp., Aeromonas spp., Pseudomonas spp., Stenotrophomonas spp., Proteus spp., Yersinia spp., Klebsiella spp., Alcaligenes spp., and Flavobacterium spp.” and gram positive “Enterococcus spp., Listeria spp., Staphylococcus spp., and Bacillus spp.”. Enterococcus spp. was the dominant genera in different seasons. Milk contamination by Listeria spp. was seasonal, its incidence was positive in winter and in spring, however it was absent in summer and autumn.
IMPROVEMENT OF SALT TOLERANCE IN DURUM WHEAT BY ASCORBIC ACID APPLICATION
(Journal of Stress Physiology & Biochemistry, 2011-01-07) Azzedine Fercha
The main objective of this study is to examine whether exogenously applied Ascorbic acid (AsA) may enhance the salt tolerance in durum wheat (Triticum durum Desf. var. Waha). Two weeks old seedling, grown in plastic pots of 1kg, were subjected to salt stress by adding 25ml of NaCl (150mm), and treated or not with the addition of ascorbic acid (0.7 mM). Two weeks after salt stress, plants were harvested and the various measures were recorded. The effects of salt stress, in the presence and absence of vitamin C, on the leaf growth, leaf area (LA) and some physiological and biochemical changes were investigated. It was established that the application of vitamin C mitigate to variable extent the adverse effect of salt stress on plant growth, may be due, in part, to increased leaf area, improved chlorophyll and carotenoid contents, enhanced proline accumulation and decreased H2O2 content. In conclusion, we can say that treatment with ascorbic acid improve salt tolerance in durum wheat through the enhancement of multiple processes.
CONTRIBUTION DU DIAGNOSTIC BIOCHIMIQUE BACTERIEN DANS L’ETABLISSEMENT DES PARENTES PHYLOGENETIQUES : CAS DES Enterobacteriaceae ET Pseudomonas sp
(Sciences& Technologie, 2011-12) M. A. HAMIDECHI
Ten bacterial strains were isolated from clinical samples provided by the bacteriology laboratory (Daksi, Constantine). Among the ten strains studied, eight belong to the Enterobacteriaceae and two are among the Pseudomonadaceae. These strains were presumptively identified by their biochemical characteristics, susceptibility or resistance to antibiotics, and total nitrogen measured by the Kjeldahl method. A phylogenetic profile was produced by phenetic methods based on the calculation of genetic distances using the Neighbor Joining algorithm (NJ) and bioinformatics analysis of 16S rRNA sequences to compare the two phylogenies (phenotypic and genotypic). The analysis of topologies obtained showed that the biochemical phenotype has some limitations in bacterial identification and sequence analysis of 16S rRNA is a key tool in bacterial identification across the case.
Sélection des Bactéries Lactiques Productrices Des Bactériocines Isole a Partir d’un Produit Traditionnellement Fermente (Jben) de la Région de Khenchela.
(Université Abbes Laghrour -Khenchela-, 2012) Nouna Sabah; Saidane Nassima; Encadreur: THABET .R.
Abstract A total of 13 strains of lactic acid bacteria isolated starting from a traditionally fermented product (jben) was identified on the basis of some number of morphological, biochemical and physiological criteria. The identification as of these strains revealed the presence of too genera: Lactobacillus (77%), Lactococcus (23%). The screening of these 13 bacterial isolates for the production of antibacterial activities of the jben allowed us to select 3 bacterial strains producers of bacteriocins they were the strains (Lactobacillus plantarum ST2, Lactobacillus acidophilus TH1 and Lactococcus lactis Subsp. Lactis LCL2). The research of bacterial antagonism was carried out according to the method of double-layers and the method of wells diffusion agar under conditions that eliminate the effect of the lactic acid and hydrogen peroxide. In addition, we highlighted the experimental conditions that eliminate the effect of the lactic and hydrogen peroxide. In addition, we highlighted the experimental conditions to determine the spectrum of activity. The strains bacteriocin-producing and its bacteriocins show a potentiality in the fight against the majority of the indicator bacteria tested (Gram+) in food systems particularly in the elaborate jben traditionally under uncontrolled hygienic conditions.
Chemical composition and digestibility of some browse plant species collected from Algerian arid rangelands
(Spanish Journal of Agricultural Research, 2012) sohil Boufennara; Lyas Bouazza
Many wild browse and bush species are undervalued mainly because of insufficient knowledge about their potential feeding value. The objective was to evaluate some nutritional attributes of various Algerian browse and shub species (Atriplex halimus, Artemisia campestris, Artemisia herba-alba, Astragalus gombiformis, Calobota saharae, Retama raetam, Stipagrostis pungens, Lygeum spartum and Stipa tenacissima). Chemical composition, phenols and tannins concentration, in vitro digestibility, in vitro gas production kinetics and in vitro bio-assay for assessment of tannins using buffered rumen fluid, and in situ disappearence of the edible parts of the plants (leaves, thin twigs and flowers) were determined. In general, protein content in dicotyledon species was always greater than in monocotyledon grasses, these showing higher neutral and acid detergent fibre and lower lignin contents than dicots. The tannin concentrations varied considerably between species, but in general the plants investigated in this study had low tannin contents (except for Artemisia spp. and S. tenacissima). Monocots showed lower in vitro and in situ digestibilities, fermentation rate, cumulative gas production and extent of degradation than dicot species. The plants were clustered by principal components analysis in two groups: poor-quality grasses and the most digestible dicot species. Chemical composition (neutral detergent fibre and protein) and digestibility were the main influential variables determining the ranking. In conclusion, A. halimus, A. campestris, A. herba-alba and A. gombiformis can be considered of greater nutritional value than the highly fibrous and low digestible grasses (S. pungens, L. spartum and S. tenacissima) that should be considered emergency roughages
Elimination des nitrates par procédé biologique des eaux de la région de Khenchela
(Abbes Laghrour University- Khenchela, 2012) Kheddouma, Asma
The purpose of this work is to study the phenomenon of biological denitrification by using mixed culture taken from activated sludge of sewage treatment plant of KHENCHELA and pure culture isolated from the same activated sludge. Our experiences were made in serial batch reactors incubated anaerobically in a candle jar at 30 ° C with several types of carbon sources. The first experiments with mixed cultures show different growth kinetics and denitrification. These kinetic depend directly to the nature, biodegradability and concentration of carbon source. The use of glucose allows bacteria to grow well with high denitrification yield. However, our experiments with pure cultures allows us to isolate six species identified as Pseudomonas luteola, Aeromonas hydrophilae, Enterobacter cloacae, Moraxella spp, Sphingomonas paucimobilis and Burkholderia cepacia,. They show the existence of bacterial species able to reduce nitrates with reduction rate rather important at different carbon sources.
Impact des rejets de la station d'épuration d'ElManchar sur la qualité des eaux souterraines (wilaya de Khenchela , Nord Est Algerien)
(Abbes Laghrour University- Khenchela , 2012) Nedjar, Yamama*
This work aims to assess the degree of contamination of groundwater in the area drained by the treated wastewater from the sewage treatment plant with activated sludge of the city of Khenchela in physicochemical elements and the indicator elements of pollution. In a first step, we performed a physicochemical analysis of samples monthly water discharge of the sewage treatment plant. The second step is intended for the analysis the groundwater of 17 water points distributed over the study area, two of which are selected like witness for reason of his distance of the zone drained by the discharges. In light of the results obtained, the treated wastewater, with the exception of biochemical demand for oxygen BOD5 and total suspended matter levels and the salinity which present important contents, are suitable for reuse in irrigation. The diagnostic quality of treated effluent shows that the original domestic and the contamination by metallic elements is not a significant threat, continuation the accumulation of the latter in sludge. The results of analyses of groundwaters clearly show a considerable accumulation of chlorides, sulphates, calcium, ammonium and out of manganese whereas zinc, copper and iron record values which do not exceed the drinking water standards. A deterioration of the quality of water was very remarkable meadows of the sewage treatment plant and downstream in the direction of flow of the tablecloth what shows the infiltration of water of rejection towards the tablecloth. The analysis of the principal components enabled us to make a distinction between two water classes, first is characterized by a low salinity and free from undesirable elements, whereas the second is strongly mineralized and polluted. That is due to the contributions of treated waste waters.
Mise en évidence d’une activité anti-Candida albicans chez des souches de levures
(Université Abbes Laghrour -Khenchela-, 2012) Taibi Rouia; Okba Wassila; Encadreur: LABBANI. F-Z
Four yeast strains, isolated from soil in the Constantine region (North-eastern Algeria), in the laboratory of Microbiological Engineering and Applications, University Mentouri - Constantine and belonging to the genera : Candida, Meyerozyma, Pichia and Saccharomyces, are tested for their potential killer against a pathogenic strain of the specie Candida albicans. The test demonstrated the activity of the killer YPGA BM, buffered to pH 4.5 with citrate-phosphate buffer (0.1 M) shows that after 5 days of incubation at 25 ° C Meyerozyma only strain sp. develops a clear zone of inhibition vis-à-vis C. albicans, while strains Candia sp., Pichia sp. and Saccharomyces sp. have none. However, in the presence of concentrations of 1% and 3% NaCl, the strains Candida sp. and Pichia sp. also develop a clear zone of inhibition vis-à-vis C. albicans, next to Meyerozyma sp. who always keeps his killer phenotype. This shows that these strains, potentially killer, are halotolerant yeasts and the presence of NaCl in the medium promotes the expression of their killer phenotype. In conclusion, we can say that the potential killer strains of Candida sp., Pichia sp. and especially Meyerozyma sp. expressed against the pathogenic strain C. albicans appears to be interesting and may qualify the producing strains for medical applications. However, deeper studies are needed to carry out investigations on the possibility of applying the killer protein synthesized as new antifungal agents. أربعة سلالات من الخمائر، عزلت من طرف مخبر الميكروبيولوجي للهندسة والتطبيقات، جامعة منتوري - قسنطينة، من تربة مدينة قسنطينة (شمال شرق الجزائر)، و التي تنتمي إلى أجناس Meyerozyma Candida Pichia و Saccharomyces ، وقد تم اختبار هذه السلالات لقدرتها المضادة للسلالة Candida albicans. اختبار النشاط االقاتل على الوسط -YPGA BM في درجة حموضة 4.5 مع سترات الفوسفات (0.1 مول) أظهرت أنه بعد 5 أيام من التحضين على 25 درجة مئوية Meyerozyma هي السلالة الوحيدة القادرة على تطوير منطقة مثبطة واضحة ضد Candida albicans ، في حين أن السلالات Pichia sp ،.Candida. و Sacchromyces sp. لم يتم الكشف عن أي تأثير مثبط ضد خميرة Candida albicans. ومع ذلك، في وجود التراكيز 1% و 3% من كلوريد الصوديوم، السلالات Candida sp, Pichia sp. أيضا أظهرت منطقة واضحة مثبطة ضد Candida albicans ومن جهة Meyerozyma sp التي تبقى دائما محافظة على نمطها الظاهري القاتل. هذا يدل على أن هذه السلالات قاتلة، و هي خمائر محتملة للملوحة الشديدة ووجود كلوريد الصوديوم في الوسط يشجع على التعبير عن هذا النمط القاتل. الخلاصة: يمكننا القول أن القدرة القاتلة المحتملة للسلالات Pichia sp .Candida sp. وخاصة .Meyerozyma sp الموظفة ضد السلالة الممرضة Candida albicans ، تبدو مثيرة للاهتمام، وربما تؤهل السلالات المنتجة للاستخدامات الطبية. ومع ذلك، هناك حاجة لدراسات أكثر عمقا لإجراء تحقيقات بشأن إمكانية تطبيق البروتينات القاتلة كعوامل مضادة جديدة
Apport et distribution des nutriments dans le bassin versant Seybouse à la mer
(Université Abbes Laghrour -Khenchela-, 2012) Zouaoui Sara; Nemer Hadda
Seybouse river drains one of the main watershed basins of the country (6500 km ) with a strong climatic hydrographic network. On this basin exerted significant anthropogenic activities from the number of inhabitant (2 million inhabitants) that grow quickly. In order to cover the drainage basin of Seybouse, six stations were sampled during our study of the winter period. For a better understanding of the chemical conditions reigning the basin, the stations are positioned according to strategic points: upstream and downstream of dams in the confines of the basin, the ultimate crossroads mouth of by-products of anthropogenic activities. What we retained from this study is the important capture of Silicon at the level of dams which will necessarily impact the coastline receiving. It should also be noted the dominance of the organic fraction of phosphorus (POD) compared to that of nitrogen which form as 17% of dissolved nitrogen. Paradoxically, in terms of nitrogen and phosphorus dissolved with a ratio of 8 deviates widely to the Redfieled report. However as Silicon is a reduction in the mouth with a report full of Si/N = 1.
Identification et caractérisation des communautés microbiennes des sources hydrothermales de l'Est Algerien
(Abbes Laghrour University- Khenchela, 2012) Yakhlef, Wahiba
Considerable interest is given to the thermophilic microorganisms associated with terrestrial hot springs. Sixteen microbial strains were isolated and purified from thermal water samples collected from hot springs in eastern Algeria. The samples in question are considered after measuring the temperature, as extreme ecosystems. Thermus medium (0.8% polypeptones, 0.4% yeast extract) was in favor of the isolation of aerobic thermophiles. It turned out that 50% of all isolates are thermophilc and 12.5% are hyperthermophilic. 18.75% of the isolates are able to grow in a pH range from 5 to 9. Four thermophilic strains were able to reduce nitrates; five are amylolytic, at least nine strains possess a proteolytic enzyme and four strains (28.57%) were active against at least one of the tests used bacteria (S. aureus ATCC 25923, S. aureus ATCC43300, P. aeruginosa ATCC25922 and E. coli ATCC27853). The study of their morphological, physiological and biochemical characters suggests that these strains belong to the genera Geobacillus, Pseudoxanthomonas, Aeromonas, Exiguobacterium, Thermus, Thermoproteus and Fervidobacterium. Our results extend our knowledge on the microbial communities indigenous to the hot springs and their interest in biotechnology.
ETUDE EPIDEMIOLOGIQUE DE LEISHMANIOSE CUTANEE DANS LA WILAYA DE KHENCHELA
(Université Abbes Laghrour -Khenchela-, 2012) HOUHA Imen; REGHIS Sabrina
Abstract The leishmaniases are zoonoses caused by parasites of the genus Leishmania transmitted to humans by the bite of a female sucking insect called sandfly. The cutaneous form is the most common, this condition has recognized a remarkable spread in the province of Khenchla. This study aims to treat the results of census of leishmaniasis cases in the region of Khenchela, spread over a period (2006-2O11) from Department of Epidemiology of the DDS. Our results show that the LC is a relatively common among men, especially young adults in particular (20 and 44). Cutaneous leishmaniasis, although not an epidemic in the northern province of Khenchela because the reported cases come through it: travelers, tourists, or many cases come to health care. But it's an epidemic in the south of the province. This area, in effect, an favorable environmental medium for the proliferation of reservoirs and vectors.
L'influence des paramètres climatiques sur la qualité des eaux superficielles du bassin versant de Foum El Gueiss
(Université Abbes Laghrour -Khenchela-, 2012) Bouali Mohamed
Le bassin versant de Foum El Gueiss se situe à Nord-Est d’Algérie, Ce bassin possède actuellement des ressources hydriques souterraines et superficielles, l'utilisations des eaux du barrage de Foum El Gueiss sont beaucoup plus pour l’irrigation L’objectif de ce thème de recherche est l’étude de l’influence temporaire des paramètres climatologiques sur la qualité physico-chimique des eaux à l’irrigation Les formations d’âge quaternaire se répartissent en totalité dans le bassin versant avec la présence des alluvions récentes constituent par des sables, des graviers et des limons gris La région d’étude est soumise à un climat semi-aride, elle est caractérisée par un printemps pluvieux et un été chaud et sec La qualité chimique de l’eau est bonne à période de (mars, avril, mai, juin, novembre) avec 41.66%, et admissible à période de (janvier, février, juillet, aoûte, septembre, octobre, décembre) avec 58.44 %, résultant d’une faible salinité influencé par la lithologie de la région et les facteurs climatiques (Précipitations et températures), donc les eaux de barrage de Foum El Gueiss conviennent à l’irrigation. En fin les résultats de cette étude rependent aux questions évoquées dans la problématique de départ الملخص يقع حوض فم القيس في الشمال الشرقي الجزائري هذا الحوض مزود حاليا بمصادر مياه جوفية و كذا سطحية والمتمثلة أساسا في سد فم القيس أغلب استعمالات مياه هذا السد تستغل في النشاط الزراعي (الري) الغاية من هذا البحث هو دراسة التأثير الشهري للعوامل المناخية على النوعية الكيمائية والفيزيائية لمياه هذا السد وكذا مدى صلاحيتها للري يتميز حوض فم القيس جيولوجيا من الطي الرملي الحصوي مع بعض الطبقات الصلصالية المتوزعة داخل الحوض المنطقة المدروسة يسودها مناخ شبه جاف يتميز بربيع ممطر وصيف حار وجاف نوعية المياه جيدة في الأشهر (مارس أفريل ماي، جوان ونوفمبر) بنسبة 41.66%، ومقبولة في الأشهر (جانفي، فيفري، جويلية، أوت، سبتمبر، أكتوبرو (ديسمبر) بنسبة 58.44% وذلك لقلة ملوحتها من جهة نوعية الصخور وكذا لعوامل مناخية ( درجة الحرارة والتساقط ومنه فإن مياه سد فم القيس صالحة للري وفي الأخير نشير إلى أن النتائج المحصل عليها أجابت على إشكالية موضوع البحث

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