MICROBIAL CHARACTERIZATION OF ABANDONED MINING AREA OF SIDI KAMBER NORTH-EAST OF ALGERI

The ecological importance of soil bacteria is not limited to their number or biomass, although these parameters contribute greatly. Indeed, their main asset lies in their great genetic and functional diversity. In this study carried out in the abandoned mine, located in Sidi Kamber (Oum Toub, Skikda, North-Est of Algeria) our objectives was to determine: a) contamination levels of this area by heavy metals b) heavy metal impact on bacterial communities and diversity c) possible risk on the ecological integrity of this area

PHYSIOLOGICAL AND BIOCHEMICAL MARKERS IN THE PROCESS OF RESISTANCE OF HEAVY METALS IN THE ABANDONED MINING AREA OF SIDI KAMBER, SKIKDA, ALGERIA

Mining activities produce large quantities of wastes which are highly contaminated with heavy metals. This can cause adverse effects on natural ecosystems, particularly on living organisms. The study reported here concerned the biomonitoring of pollution in the Sidi Kamber mining area, through the determination of various physiological mechanisms (bioaccumulation and translocation) and biochemical markers (chlorophyll (a) and (b), proline, total sugars and total proteins) active in resistance to heavy metals (Cd, Cu, Pb and Zn) contamination, using three plant species Cistus monspeliensis, Rumex bucephalophorus and Verbascum sinuatum as bioindicators

Computational Studies into Iron-Based Biocatalysis

Iron-containing enzymes are ubiquitous in nature and play several key roles in living organisms. Unfortunately, like many other types of enzymes, their catalytic mechanisms are often elusive. The work presented herein investigates computationally the catalytic processes of three iron-containing enzymes: glycerophosphosdiesterase from Enterobacter aerogenes (GpdQ), coral allene oxide synthase (cAOS) and S-ribosylhomocysteinase (LuxS). While some were investigated primarily using density functional theory (DFT), others used quantum mechanics/molecular mechanics (QM/MM) and molecular dynamics (MD) simulations in a complementary fashion

Phytochemical Screening and Antioxidant Activities of Different Organic Extracts of Three Algerian Plants

We compared the phytochemical constituents and antioxidant activities of three important species of Lamiaceae in Algeria (Mentha spicata, Ocimum basilicum and Thymus algeriensis). We noticed that the M. spicata species contains the largest fraction of phenolic and flavonoid products (231 and 22 mg / g) than the other two species studied. Other hand we founded that the two species M. spicata and T. algeriensis show excellent antioxidant activity in the ethanolic extract according to the two tests (DPPH and ABTS) compared to the ascorbic acid of reference. But the specie O. basilicum has good antioxidant activity in aqueous extraction. This Lamiaceae family takes an important place in the lives of Algerians citizens, so this species are very good source of natural antioxidant compounds in algerian traditional medicine. Keywords: Antioxidant activity, Lamiaceae, Mentha spicata, Ocimum basilicum and Thymus algeriensis, DPPH

The homogeneity of the cognitive style (dependence/independence) of the couple and its effect on marital harmony

هدفت الدراسة إلى معرفة أثر تجانس الأسلوب المعرفي للزوجين على توافقهم الزواجي، لدى عينة من المتزوجين البالغ عددهم (200) زوج وزوجة بولاية أدرار، إعتمد خلالها الباحثان على إختبار الأشكال المتضمنة لقياس الأسلوب المعرفي الإدراكي، ومقياس التوافق الزواجي، بعد التأكد من صلاحيتها وثباتها، كما تم الإعتماد على المنهج الوصفي، وبعد معالجة البيانات إحصائياً خلصت الدراسة إلى أنه لا يؤثر التجانس في الأسلوب المعرفي الإدراكي على التوافق الزواجي، كما أنه لاتوجد فروق في التوافق الزواجي بين الأزواج الذين يتشابه أسلوبهم المعرفي و الأزواج الذين يختلف أسلوبهم المعرفي في التوافق الزواجي.The study aimed to know the effect of the homogeneity of the couple’s cognitive style on marital compatibility in a sample of husbands and wives among a sample of (200) in Adrar state, during which the two researchers relied on testing the included forms to measure the cognitive cognitive style, and the marital compatibility scale, after confirming their validity and consistency. After statistically processing the data, the study concluded that: There is no relationship between cognitive style and marital compatibility, and there are no differences between couples whose cognitive style is similar to couples whose cognitive style differs

Bio-activité des huiles essentielles de l’Armoise blanche Artemessia herba alba : effet sur la reproduction et la mortalité des adultes d’un ravageur des denrées stockées Ephestia kuehniella (Lepidoptera)

Notre travail révèle un effet insecticide de l’huile essentielle extraite de la plante aromatique Artemissia herba alba, sur la population d’insectes ravageurs des denrées stockées Ephestia kuehniella (Lepidoptera). Le bio-pesticide agit avec un double mécanisme d’action. Administré chez les adultes, l’huile essentielle provoque un taux de mortalité significatif par rapport aux témoins. Alors que son administration sur les chrysalides, prolonge leur développement nymphal et perturbe la reproduction des adultes, en prolongeant la période de préoviposition et en réduisant la période de dépôt des œufs puisque les femelles fécondées, ne pouvant vivre plus d’un ou deux jours, ce qui réduit le nombre d’œufs déposés.Bio-activity of essential oils of Artemisia herba alba : effects on reproduction and adult mortality of a pest of stored Ephestia kuehniella (Lepidoptera)Our work reveals an insecticidal effect of essential oils extracted from aromatic plant Artemissia herba alba on population of insect pests Ephestia kuehniella. The biopesticide is adual mechanism of action. Administered in adults, the essential oil causes significant mortality compared with controls. Whilehis administration on pupae, it extending their pupal development and disrupts reproductive adults by extending the preoviposition period and reducing the period for depositing eggs asfertilized females, who can’t live more than one or two days, which reduces the number of eggs deposited

Physicochemical characteristics, concentrations of phenolic compounds and antioxidant power of four local honey varieties (Algeria)

En vue de déterminer les caractéristiques physico-chimiques du miel, ses concentrations en composés phénoliques et son pouvoir antioxydant, une étude a été menée dans la région de Laghouat sur quatre échantillons du miel prélevés au hasard puis analysés. L’analyse des paramètres physico-chimiques du miels étudiés montre un pH acide de 4,15 ± 0,007, une teneur en eau de 15,4±0,44 %, une teneur en cendre est de 0,4 ±0,003 %, une acidité de 23,0 ± 0,01 meq/Kg et une conductivité électrique de 0,40 ± 0,004 mS/Cm. L’intensité de la couleur est un test qualitatif rapide qui nous a permis d’avoir une idée sur le contenu phénolique du miel. Ces caractéristiques sont plus fréquemment utilisées comme meilleurs indicateurs de la qualité et de la stabilité du miel et ont une grande influence sur ses propriétés organoleptiques. A travers nos résultats, il apparaît clairement que l’échantillon M4 constitue une source non négligeable de composés phénoliques, possède une bonne activité antioxydante et une capacité de piégeage de radicaux libres intéressante. Mots-clés: Miel naturel, caractéristiques physico-chimiques, composés phénoliques, activité antioxydante FRAP et DPPH.  In order to evaluate the physico-chemical characteristics of honey, its phenolic compounds concentrations and its antioxidant activity, a study was carried out in the Laghouat area on four samples of honey taken at random and analyzed. The analysis of the physico-chemical parameters of the honey studied showed a pH of 4.15 ± 0.007, a water content of 15.4 ± 0.44 %, an ash content of 0.4 ± 0.003 %, an acidity of 23.02 ± 0.01 meq/Kg and an electrical conductivity of 0.40 ± 0.004 mS/Cm. The intensity of the color is a quick qualitative test that allowed us to have an idea about the phenolic content of the honey. These characteristics are more frequently used as better indicators of the quality and stability of honey, and have a great influence on its organoleptic properties. Through our results, it is clear that the sample M4 was a non-negligible source of phenolic compounds, haa a good antioxidant activity and an important free radicals scavenging capability. Keywords: Natural honey, physico-chemical characteristics, phenolic compounds, antioxidant activity FRAP and DPPH

Generalized (\kappa,\mu)-space forms

Generalized (\kappa ,\mu)-space forms are introduced and studied. We examine in depth the contact metric case and present examples for all possible dimensions. We also analyse the trans-Sasakian case.Comment: 20 pages, several changes have been done in this versio

Metabolic counterparts of sodium accumulation in multiple sclerosis: A whole brain 23Na-MRI and fast 1H-MRSI study

Increase of brain total sodium concentrations (TSC) is present in multiple sclerosis (MS), but its pathological involvement has not been assessed yet. To determine in vivo the metabolic counterpart of brain sodium accumulation. Whole brain Na-MR imaging and 3D- H-EPSI data were collected in 21 relapsing-remitting multiple sclerosis (RRMS) patients and 20 volunteers. Metabolites and sodium levels were extracted from several regions of grey matter (GM), normal-appearing white matter (NAWM) and white matter (WM) T lesions. Metabolic and ionic levels expressed as Z-scores have been averaged over the different compartments and used to explain sodium accumulations through stepwise regression models. MS patients showed significant Na accumulations with lower choline and glutamate-glutamine (Glx) levels in GM; Na accumulations with lower N-acetyl aspartate (NAA), Glx levels and higher Myo-Inositol (m-Ins) in NAWM; and higher Na, m-Ins levels with lower NAA in WM T lesions. Regression models showed associations of TSC increase with reduced NAA in GM, NAWM and T lesions, as well as higher total-creatine, and smaller decrease of m-Ins in T lesions. GM Glx levels were associated with clinical scores. Increase of TSC in RRMS is mainly related to neuronal mitochondrial dysfunction while dysfunction of neuro-glial interactions within GM is linked to clinical scores