West Of Algeria Research Articles

Impact Of Cardiovascular Risk Factors In Type 2 Diabetics Living In Tlemcen And Saida,Western Algeria

The aim of the current study was to assess cardiovascular risk (modifiable and non-modifiable factors) in type 2 diabetics, living in Tlemcen and Saida (West Algeria) on a group of 315 diabetics type 2 of which; 160 patients in the Tlemcen region (64% man and 96 % woman) and 155 patients in the Saida region (90 % man and 65% woman) (western Algeria) during the period of December 2018 - May 2019. Filling of a questionnaire for patients on dietary habits, socio-economic factors, with anthropometric parameters such as weight, height and Body Mass Index were measured as well as lifestyle, a biochemical assessment was carried out and an assessment of the nutritional contributions during 24 hours were made. The results of our study showed that the frequencies of cardiovascular risk factors in the patients studied are probably related to lifestyle (smoking) more than 80% were females with family history including diabetes and hypertensia. 30% were overweight, Glycated hemoglobin level was above the recommended value in both sexes which represents one of the cardiovascular risk factors, energy imbalance and high calorie foods are also recorded in our population. Our study showed a positive relationship between cardiovascular risk factors and type 2 diabetes. The Type 2 Diabetic Population living in Tlemcen and Saida Area was Highly Exposed to Cardiovascular Risk Factors. For better management of our diabetics, we recommend: Launch a national prevention program with well-structured objectives based on information on nutrition, dietetics and healthy living among patients at risk through associations in public health.

Analyse saisonnière et interannuelle de la dynamique des flux en suspension dans le bassin versant de l’oued Boukiou (nord-ouest de l’Algérie)

Pour comprendre l’impact des facteurs hydroclimatiques et géomorphologiques sur le transport solide dans les milieux méditerranéens semi-arides à l’échelle saisonnière et interannuelle, nous avons procédé à l’exploitation de données instantanées du régime hydro-sédimentaire du bassin-versant oued Boukiou (nord-ouest de l’Algérie) durant la période d’observation allant de 1972/1973 à 2004/2005. Cette approche a révélé l’ampleur du transport solide pendant les périodes d’érosion active de l’année. Par exemple, la contribution des crues s’est élevée à 74 % durant le printemps. La courbe cumulée des flux solides annuels transportés en suspension en période de crues a été marquée par des progressions très irrégulières relativement à celle des apports liquides. La décennie 1978/1979-1989/1990 marque bien le palier le plus productif en charge solide, soit un cumul de 54 % en apport solide sur les 33 années d’observation. En calculant la distribution statistique empirique des flux solides sur la période d’étude, nous avons défini le 50ème et le 95ème centile de leur distribution. Sur 50 % de la période de mesure, les flux ne dépassent pas 4 % du flux annuel moyen estimé à 50 740 tonnes. En revanche, pendant 5 % du temps, soit environ 18 jours par an, ils sont supérieurs à 70 %. Ces résultats témoignent de l’agressivité des rares averses sur des sols vulnérables aux variations climatiques irrégulière, ils aideront les décideurs pour la conception et l’utilisation des aménagements hydrauliques futurs dans cette région.

Comparative study of the antioxidant and antibacterial activities of the essential oil and methanolic extract of cultivated sage from Mascara region (North West of Algeria) indicates a strong antioxidant activities and an important antibacterial action wi

The plant world is an excellent source of active principles, which confers its important activity. In Algeria, a large number of aromatic and medicinal plants grow spontaneously, common sage (Salvia officinalis) is a popular culinary and medicinal herb. These natural products and their active principles are sources for new drug discovery and treatment of diseases. To this end, the interest of this work is the valorization of a medicinal plant (Salvia officinalis) growing spontaneously in the region of Mascara by the study of antioxidant and antibacterial activities of the methanolic extracts and also essential oils of sage. The essential oil was isolated from aerial part of S. officinalis by hydrodistillation. The results obtained showed that the species studied (S. officinalis) was very rich in volatile substances with a yield of the order of1.19%. The antioxidant activity showed a good efficiency of the methanolicextract with respect to the essential oil with IC50s of 0.778 mg / ml and27.929 mg / ml respectively. In general, the essential oil of S. officinalis hasan interesting antibacterial power against all studied germs. These resultsare promising and provide scientific validation of the massive use of this species.

Comparison of isotopic niches of four sea cucumbers species (Holothuroidea: Echinodermata) inhabiting two seagrass meadows in the southwestern Mediterranean Sea (Mostaganem, Algeria)

Among the fauna inhabiting the Posidonia oceanica seagrass meadow, holothurians are particularly abundant and provide essential ecological roles, including organic matter recycling within seagrass sediments. This study aimed to investigate the trophic niche of four holothurians of the order Holothuriida [Holothuria poli (Delle Chiaje, 1824), Holothuria tubulosa (Gmelin, 1791), Holothuria sanctori (Delle Chiaje, 1823) and Holothuria forskali (Delle Chiaje, 1823)] inhabiting P. oceanica meadows, through the measurement of nitrogen and carbon stable isotope ratios. Two shallow and contrasting sites of the littoral region of Mostaganem (North West Algeria) were chosen. The first site, located in Stidia, is weakly impacted by human activities. The second site, located in Salamandre, is highly impacted by human activities (industries, harbor facilities). High values of δ15N in holothurians and their food sources were observed at both sites. The δ13C values showed a lower contribution from detritic Posidonia than in other areas. This could be a consequence of P. oceanica bed degradation in the studied area. The stable isotope approach did not reveal dietary differences between species, and the four holothurians species exhibited significant isotopic niche overlap. However, niche sizes differed between species showing more variable individual trophic diversity in some species (H. tubulosa and H. sanctori in Salamandre; H. forskali in Stidia). If niche segregation does occur, it is not in terms of general resource use. More likely, it would be the abundance of food sources, the different life habits and their micro-habitats that may explain their co-existence in the P. oceanica seagrass meadow.

Adsorption behavior of Janus Green B dye on Algerian diatomite

The aim of this work is to study the adsorption of a cationic dye (Janus Green B) on a non-expensive natural material. The diatomite was recovered by the Sig deposit (west of Algeria) and then was modified by simple acid treatment. The structural, textural and morphological properties of obtained materials were analyzed by different physico-chemical techniques such as x-ray diffraction (XRD), Argon sorption at 87 K, Fourier transform infrared spectroscopy (FTIR), scanning electronic microscopy (SEM), thermogravimetric analysis TGA, x-ray fluorescence (XRF) and pH of zero charge PZC. The results showed that the adsorption of the Janus Green B (JGB) dye is very fast and the equilibrium was reached after 90 min. The kinetic data were modeled using the pseudo-first-order and pseudo-second order equations. The equilibrium isotherm data were verified using the Langmuir, Freundlich and the Sips models. The results showed that the adsorption of JGB dye on raw diatomite and its modified counterpart followed Langmuir adsorption isotherm model and pseudo-second-order kinetic. The maximum adsorbed amount was obtained by raw diatomite, in which maximum adsorbed capacity Qm of 39.89 mg g−1 was recorded.

Technological characterization and sensory evaluation of a traditional Algerian fresh cheese clotted with Cynara cardunculus L. flowers and lactic acid bacteria.

Jben is an Algerian traditional fresh cheese produced on a small scale in a limited area of east and west Algeria, in Maghnia and Nadrouma. It is manufactured from raw sheep, cow or goat milks, coagulated with dried flowers of wild thistle Cynara cardunculus L. without starter culture addition. In this work, Jben was made using cow and goat pasteurized milks to improve the microbiological quality. Milk was clotted with crude enzymatic extract of dried flowers of wild thistle C. cardunculus L. In order to obtain a better organoleptic characteristic, the assays of cheese making were realized with adding strains of lactic acid bacteria isolated from traditional cheeses. Physico-chemical and microbiological analyzes were carried out on the manufactured cheeses. Milk was clotted with 0.5% v/v by aqueous extract (40g/L) of dried flowers of C. cardunculus L. Better organoleptic quality and higher cheese yield were obtained with goat milk. Cheese made from pasteurized goat's milk added with Lactococcus lactis subsp. lactis, and that added with the mixture of lactic acid bacteria strains L. lactis subsp. lactis, Lactococcus raffinolactis, Leuconostoc mesenteroïdes ssp. mesenteroïdes, were the most appreciated. It is believed that the activity of L. raffinolactis in dairy products may contribute to their final sensory characteristics.

Phenotypic and Molecular Characterization of Lactobacilli Isolated from breast-fed Infants faeces in Bechar region,South West of Algeria

Lactobacilli are of great importance to humans, as they are essential members of a healthy human microbiota at various niches and serve as biologically and functionally important components of a healthy human diet. For this reason, the isolation of lactobacilli strains from infant feces (less than 6 months old) was carried out in Bechar region, Algeria. In total, 62 strains were isolated, purified, and identified based on the physiological and biochemical methods. For final confirmation, API 50 CHL gallery was used. The iden ca on and phylogenetic analysis of isolated strains was performed by sequencing the 16S rRNA gene, which led us to identify four species with different percentages; Lactobacillus rhamnosus, L. fermentum, L.mucosa, L. plantarum. With regard to the characteristics of technological interest, most of the identified strains exhibited good lactic acid production. However, it was not until after 3 hours of incubation at 37 °C that isolated lactobacilli produced a maximum acidity, which reached Δ pH 0.54 in the reconstituted milk. The results were different with camel milk, in the first time, and this was observed in the acidity rate which was generally lower in this type of milk in which acidity reached Δ pH 0.47 .As regards the proteolytic power, the strains showed a high level of proteolysis. Regarding the lipolytic activity, it was observed that none of the lactobacilli tested expressed lipolytic activity in the presence of buffer and olive oil, whereas the results of the strains were different as regards the flavoring activity and the texturing activity.

Seismic Fragility Curves and Damage Probabilities of Concrete Gravity Dam Under Near–Far Faults Ground Motions

Dams are very costly structures that are often built in areas prone to seismicity due to geological and geomorphological considerations. To protect such structures against seismic actions, in-depth studies on their vulnerability should be undertaken. This study deals with the seismic vulnerability of a concrete gravity dam. The Oued El Fodda dam on the Oued Chelif River, west Algeria, is considered as a case study. The dam is studied under near- and far-fault ground motions. To derive fragility curves, non-linear time history analyses are performed by using a Latin hypercube sampling numerical simulation procedure. Damage probabilities are determined for each defined limit state. The results show the vulnerability of the dam under high-level seismic motion. A sensitivity analysis was performed to evaluate the influence of uncertain parameters on structural responses. The most important parameters are then identified.

Isolation and identification of low density polythene-degrading bacteria from soil of North West of Algeria

Plas c bags (Low Density Polyethylene (LDPE) belong to the polymers, which plays a very important role in our daily lives by their diversi ed applica on. However, the accumula on of the plas c bags in the environment cons - tutes a serious problem and a real source for visual nuisance, pollu on of soil and marine environments. Furthermore, their biodegradation was the safest method of breakdown that possibly leaves behind less toxic residues and showed poten al of bio-geo chemical cycling of the substrate. The aim of the present work was the characterization of the isolated bacterial strains from a municipal land ll area of Tlemcen, North West Algeria, which were implicated by the biodegrada on ability of the Low Density Polyethylene. The degradation of the Low Density Polyethylene was inves gated by studying the bacterial growth of the isolated, inoculated on a solid culture medium, which was composed of LDPE as the sole carbon source with and with- out a nitrogen source and the selec on was based by the determination of the produced diameter of hydrolysis clear zone on the surface. Furthermore, the isolated, selected degrading Low Density Polyethylene bacterial ML002 has been iden ed by the study of their morphological, biochemical charac- teris cs and the ampli ca on of the fragment, coding the region of ARN 16S. The use of the API system indicated their belonging to the genus Bacillus Cereus, which has reduced the weight of LDPE by 0.26, 1.28, 1.53% a er 30, 90, 120 days respec vely. Furthermore, the amplified of the fragment, coding the region of ARN 16S by the isolated, selected bacterial ML002 indicated a similarity of 99.394% with Bacillus wiedmannii and Bacillus proteolyticus and 99.293% homology with Bacillus toyonensis, Bacillus cereus and Bacillus thuringiensis.

Genetic association study between T-786C NOS3 polymorphism and essential hypertension in an Algerian population of the Oran city

BackgroundEssential hypertension is an important risk factor for the development of cardiovascular disease. Important candidate genes such as NOS3 gene have been widely studied and reported to be associated with essential hypertension (HTN) in human populations. AimWe aim in this study to analyze the relationship between NOS3 -786T/C, a common genetic variant and HTN in a sample of the Algerian population of the Oran city. MethodsA case-control study has been performed in 154 subjects including 77 hypertensives and 77 normotensives. The recruitment of these subjects was done in local Health Centers of the city of Oran, West Algeria. HTN was defined as elevated systolic blood pressure SBD≥140 mmHg and or sustained diastolic blood pressure DBP≥90 mmHg, measured using an Omron® Automatic BP Monitor - M-3W machine. Consents were obtained from all participants. Polymerase chain reaction (PCR) combined with restrictive fragment length polymorphism (RFLP) was used to genotype the NOS -786T/C variant. ResultsThe distribution of the allelic frequencies did not differ between cases and controls (OR = 1.48; 95%CI [0.94–2.32], P = 0.09). However, after adjustment with the age, sex, and body mass index, we observed significant association between NOS -786C allele and HTN status (OR = 2.08; 95%CI [1.18–3.66], P = 0.01). ConclusionOur results indicate that the C allele of the NOS3 gene is associated with increased risk of essential hypertension in this sample of the Algerian population of the Oran city. Further validation in larger samples is needed to confirm this finding.

Chemical Composition and Biological Activities ofAmmoides verticillataEssential Oil from West Algeria

Chemical Composition and Biological Activities of<i>Ammoides verticillata</i>Essential Oil from West Algeria

Concentrations of Lead, Cadmium and Mercury in Cord Blood and Prematurity in the Sidi Bel Abbes Region (West of Algeria)

Concentrations of Lead, Cadmium and Mercury in Cord Blood and Prematurity in the Sidi Bel Abbes Region (West of Algeria)

Could the Hybrid form of Lecturing and Active Learning be used as a Curricular Tool for Medical Education of Immunology in Algeria?

Lecturing has been the predominant mode of instruction since universities were founded in Western Europe over 900 y ago and still the sole method of instruction in the developing countries. However, claiming that adopting a specific new method will have reproducible results regardless the population’s characteristics is simply not possible. In this study, we sought to demonstrate that hybrid form of lecturing and active learning could be used as a curricular tool for medical education, specifically for immunology, to enhance learning performance and promote development of test-taking and metacognitive skills among students from the faculty of medicine of Oran, West Algeria. One hundred fifty four 2nd year dental medicine students were analyzed for several parameters to assess classical and active learning methods. The median comparison showed a marked improvement of exam scores in groups taken Brainstorming (BS) and Problems-Based-Learning (PBLs) (p<0.00). BS was associated with the control of immunology learning (p = 0.044), students active participation (p = 0.023), practical knowledge (p = 0.011) and knowledge organization of the (p = 0.045). Herein, we confirm that the active learning is widely accepted by Algerian medical student as complementary tool to the lecturing. We propose that hybrid formula of these two approaches is needed to work cooperatively to solve problems and develop solutions.

Selection of the most adequate frequency model to estimate the flood extreme values in the North West of Algeria

This work is intended to determine the most appropriate model to estimate the extreme values of flood in the North West of Algeria. The study is conducted in two steps. The first one consists on the determination of the type of laws which may represents better the data series using the log-log plot. The second step extends on the establishment of a ranking of the laws of the selected type. This has become possible with the application of different choice criteria: the Bayesian information criterion, the Akaik information criterion corrected and the Schwarz criterion. In this step, we have first established a ranking based on the unique information gets from the observations of each site independently and secondly, to explore the information from the adjacent sites through a Bayesian approach. The results obtained put the Gamma law in the first position.

Evaluation of sexual behavior of stallion (Arabian versus Barb) during breeding season in Algeria

This study was carried out at National Haras of Tiaret (west of Algeria) to understand and to compare the normal sexual behavior and libido of stallions (Arabian vs Barb) while mounting a mare in estrus. Eighty-four stallions were divided into two groups from 5 to 24 years of age (n=47 Arabian; n=37 Barb). Results revealed significant differences between Arabian and Barb stallion: in sniffing (p less than 0.001), libido score (p less than 0.05), flehmen response (p less than 0.05), time to first mount with erection (p less than 0.05), number of mounts to ejaculation (p less than 0.05) and mount time for ejaculatory (p less than 0.01). These stallions were exactly tested in the same place and conditions allowed us to discard any side effects due to animal management or any other confounding bias. Our study provided us the knowledge of sexual behavior under Algerian environmental conditions and the distinction between Arabian and Barb stallion in their sexual behavior expression.

Wound Healing Activity of Propolis of West Algeria

Propolis is a resinous substance that bees use todefend their colonies against any pathogen. It has beenused in traditional medicine since ancient times because ofits therapeutic properties. Pollen analysis of propolis of AinTrid has shown that the region of Ain Trid is rich in plantspecies visited by bees (31 genus identified) and that themajority of these species are considered as medicinal plants,which gives propolis an important place in wound healing.The study of the wound healing activity is carried out in vivoon theWistar rats divided into 3 groups: group 1 treated withpropolis ointment, group 2 treated with commercial cream,and group 3 considered as untreated. The duration of treatmentwas estimated to be 23 days. The results obtainedshowed that the group treated by propolis ointment showeda high cure rate, in which the percentage of wound closurereached up to 94.93% ± 5.29 in the group 1, while in thegroup 2 arrived to 79.97% ± 13.01, and in group 3 was72.55% ± 19.94. The results demonstrated also that the numberof days required to contract 50% of wound area wasdifferent among the groups, in the 12th day in group 1,16th day in group 2, and 18th day post wounding in group 3.These results have shown that propolis can be prepared andused in traditional medicine as a natural ointment for thetreatment of skin diseases in our region.

Short Communication: Habitat characterization of Aristolochia baetica L. in Tessala Mount, Western Algeria

Zahra H, Zoheir M, Ali L, Kouider C, Amel A. 2018. Short Communication: Habitat characterization of Aristolochia baetica L. in Tessala Mount, Western Algeria. Biodiversitas 19: 1632-1641. The aim of the current investigation was to study the characterization of the habitat of Aristolochia baetica L., an Ibero-Mauretanian species, present in Tessala Mount (West of Algeria). Twenty-four phytoecological surveys were realized on eight stations (St1-St8) in which the species is present. The floristic inventory allowed us to identify 68 species which are part of the floristic of A. Baetica, distributed in 31 botanical families; 6 biological and 19 biogeographical types. The assessment of edaphic and plant data using correspondence factor analysis (CFA) and hierarchical ascending classification (HAC) showed that A. baetica is a member of plant training of scrublands and grows especially in stations at low heights with a high rate of limestone.

Spatial dynamics of land cover in the Sdamas region (Tiaret, Algeria)

The Sdamas massif to which our contribution relates is located in West Algeria, it is an integral part of the Tiaret mountains. The aim of our study is to analyze the land cover of the Sdamas region over a 43-year interval grouped into 9 thematic classes: mineral surfaces (urban planning), wetland, vegetation, bare soils and fallow etc. The spatial and temporal dynamics of land use require regular monitoring of vegetation cover from remote sensing imagery. It is for this reason that we relied on field data to perform the diachronic analysis with three well-defined scenes 1972, 1998 and 2015, using Landsat satellite images (MSS, TM and ETM +). The analysis of these maps covering the same region shows the different changes that have taken place at ground level. We found that our natural plant space has undergone a strong degradation, disruption and regression because of different human activities, namely: overgrazing, clearing, fires, urbanization, (there has been a remarkable increase in the population of the communes of the study area). Inadequate and ineffective forestry interventionsand work, and lack of sustained protection are reasons of these processes. Factors affecting the forest ecosystem are bioclimate and human action. Indeed, the bioclimate, through atmospheric drought, is the main factor governing the diversity of these formations of the Sdamas mountains.

Study of anti-corrosion activity of Algerian L. stoechas oil on C38 carbon steel in 1\xa0M HCl medium

The current study was designed to give more knowledge and helping to exploit the leaves of the plants L. stoechas collected in Tlemcen region in the west of Algeria by determining the anti-corrosive activity of its essential oil. The inhibitory efficiency of the essential oil of the plant obtained by hydrodistillation and characterized by GC and GC/MS was studied using gravimetric and electrochemical methods (polarization curves and electrochemical impedance). The effect of temperature on the corrosion behavior of the steel and the inhibitory efficiency was studied in a temperature range of 303–323 K at 2 g/L. The surface morphology of the samples immersed in 1 M HCl for 24 h, before and after adding inhibitor at (2 g/L at 30 °C) was analyzed by scanning electron microscope (SEM) Quanta 250 with tungsten filament from the company FEI. Results show that the addition of the essential oil of the plant to the medium induces a diminish in the rate of corrosion and augmentation in the inhibitory efficiency of the oil. We established that the inhibition efficiency increase with concentration of the essential oil of lavender to attain 76.19% at 2 g/L. Polarization curves revealed that lavender oil react as a mixed-type inhibitor. EIS spectra exhibit one capacitive loop and confirm the inhibitive ability, and the changes in impedance parameters were indicative of adsorption of essential oil of lavender on the metal surface. The thermodynamic parameters indicate that the adsorption of the molecules of the oil takes place according to the Langmuir isotherm in the corrosive medium studied and that they are physisorbed on the metal surface. The analysis of the surface by electron microscopy demonstrates the absence of surface attack patterns in the presence of the oil. The results obtained from different tested techniques were in good agreement.

Assessment of Centurial Extreme Coastal Climate of Bethioua Algeria

Nearshore marine climate at the Port of Bethioua, located on the west of Algeria, were studied using real-time field data and climatological offshore data obtained from the UK Met Office. Total waves, swells in the offshore are hind-casted separately and were validated using buoy measurements were supplied by UKMO at a nominal cost. Shallow water wave transformations are modelled using the Teluray wave-current model to calculate shoaling, depth refraction and current refraction taking bathymetry and tidal flows from the TELEMAC flow model as inputs. The results are of particular importance in the context of planning of port and safe anchorage and movement and anchoring of vessels in the harbour area, in addition, for future developmental programs at the port of Bethioua.