The efforts of the University Psychological Help Center in M`sila to provid psychological support to the student during the time of the Corona epidemic.

تهدف الدراسة الحالية الى الكشف عن جهود مركز المساعدة النفسي الجامعي بالمسيلة في التكفل بالأسرة الجامعية. من خلال مختلف الأنشطة العلمية كالمحاضرات والندوات التحسيسية وعرض طرق الوقاية عبر إذاعة الجامعة وإذاعة الحضنة وصفحات التواصل الاجتماعي من طرف طاقم المساعدة النفسية من أساتذة وطلبة دكتوراه في الاختصاص وممارسين عياديين من داخل الجامعة وخارجها. لتجاوز الضغوط المصاحبة لتفشي "كورونا" والتكيف مع الحجر الصحي المنزلي، كما تم التعرض الى مفهوم وأبعاد التكفل النفسي وتعريف الأوبئة ومن أهم انواعها؛ جائحة كورونا.The current study aims to reveal the efforts of the university psychological assistance Center in M`sila in the sponsorship and the university family. Through some scientific activities such as virtual lectures and awareness-raising seminars, and the presentation methods through university radio, Hodna radio and social media pages by psychological clinical practitioners from inside and outside the university to overcome the pressures associated with myself Corona and to adapt to the domestic quarantine. The concept and dimensions of psychological sponsorship and the definition of epidemics were also discussed, and one the most important types is the Corona pandemic

Contribution of Gravity Data for Structural Characterization of the Ifni Inlier, Western Anti-Atlas, Morocco: Hydrogeological Implications

The Sidi Ifni region in southwest Morocco is mainly composed of crystalline rocks with limited groundwater storage capacity. These water resources drain in particular fault zones with high fracture permeability. The main objective of this study is to describe the geological structure of the region to optimize future drilling locations. The gravity data were processed using various techniques, such as total horizontal gradient, tilt derivative, and Euler deconvolution, in conjunction with the interpretation of the geological data, to create a new structural map. This map confirms the presence of many previously identified or inferred faults and identifies significant new faults with their respective trends and depths. Analysis of this map shows that major faults are oriented NNESSW and NE-SW, while minor faults are oriented E-W, NW-SE, and NNW-SSE. The superposition of the hydrogeological data and the structural map reveals that the high groundwater flow values in the boreholes are located in the vicinity of the major faults and talwegs. The structures deduced from the filtering and interpretation of the gravity data suggest that the hydrogeological system of the Ifni Inlier is controlled by its structures. To confirm this impact, a high-resolution electrical resistivity map (7200 Hz) was used, with penetration depths ranging from 84 to 187 m. Negative boreholes, located in high resistivity ranges corresponding to sound basement formations without fault crossings, showed high resistivity values. The positive holes, located in anomalies with low linear resistivity, revealed the impact of fault crossings, which drain water and tend to decrease the resistivity values of the formations. Therefore, these new structural maps will assist in planning future hydrogeological studies in this area

Optimization of β-1,4-endoxylanase production by an Aspergillus niger strain growing on wheat straw and application in xylooligosaccharides production

20 p.-6 fig.-6 tab.Plant biomass constitutes the main source of renewable carbon on the planet. Its valorization has traditionally been focused on the use of cellulose, although hemicellulose is the second most abundant group of polysaccharides on Earth. The main enzymes involved in plant biomass degradation are glycosyl hydrolases, and filamentous fungi are good producers of these enzymes. In this study, a new strain of Aspergillus niger was used for hemicellulase production under solid-state fermentation using wheat straw as single-carbon source. Physicochemical parameters for the production of an endoxylanase were optimized by using a One-Factor-at-a-Time (OFAT) approach and response surface methodology (RSM). Maximum xylanase yield after RSM optimization was increased 3-fold, and 1.41- fold purification was achieved after ultrafiltration and ion-exchange chromatography, with about 6.2% yield. The highest activity of the purified xylanase was observed at 50 °C and pH 6. The enzyme displayed high thermal and pH stability, with more than 90% residual activity between pH 3.0–9.0 and between 30–40 °C, after 24 h of incubation, with half-lives of 30 min at 50 and 60 °C. The enzyme was mostly active against wheat arabinoxylan, and its kinetic parameters were analyzed (Km = 26.06 mg·mL−1 and Vmax = 5.647 U·mg−1). Wheat straw xylan hydrolysis with the purified β-1,4 endoxylanase showed that it was able to release xylooligosaccharides, making it suitable for different applications in food technology.This work has been funded by Projects GLYSUS RTI2018-093683-Β-I00 (MCIU/AEI/FEDER) and RETOPROSOST2 S2018/EMT-4459 (Comunidad de Madrid).Peer reviewe

Study of an Aquifer in a Semi-arid Area Using MRS, FDEM, TDEM and ERT Methods (Youssoufia and Khouribga, Morocco)

International audienceTo improve the knowledge on available groundwater and to better characterize the aquifers on the phosphate deposits at Youssoufia and Khouribga (Morocco), several geophysical surveys using Magnetic Resonance soundings (MRS), Frequency Domain Electromagnetic Method (FDEM), Time Domain Electromagnetism (TDEM) and Electrical Tomography (ERT) were performed. The goal was to test the capability of these methods to localize an aquifer and estimate its hydrogeological properties. The first experimental results indicate the presence of highly conductive zones that could be related to the presence of water. MRS data has permitted to better constrain the aquifer parameters. The hydrogeological model provided by these methods is similar to the one obtained by piezometric data

Isolation and Screening of Fungal Culture Isolated From Algerian Soil for the Production of Cellulase and Xylanase

Lignocellulolytic enzymes constitute a very large group of extracellular proteins secreting by fungi who is ecologically involved in the degradation of a variety of complex materials, a property that is attributed to a battery of enzymes produced by these microorganisms like cellulases and xylanases who are of significant industrial value and relevance. Forty fungal isolated from rich soil in organic matter were screened for lignocellulolytic enzymes production, its organized on the basis of their hydrolytic potential of cellulose and xylan. The isolates strains presented enzymatic activity which was ranked as follows: cellulolytic (56%), xylanolytic (44%). Some selected strains that produce high levels of enzymes (cellulase, xylanase) grown in submerged fermentation (SmF) and were quantitatively evaluated. The fermentation experiments were carried out in shake flasks. The highest CMCase (5,10 IU/ml) and xylanase (98,25 IU/ml) activities were obtained from Trichoderma sp strain Mtr6 isolate. Keywords: Fungi, Trichoderma sp, lignocellulolytic enzymes, soil, screening, organic matter