L’exclusion des femmes de l’exercice du pouvoir : Analyse psychologique d’une fragilité supposée

International audienc

Characterization and evaluation of the factors affecting the geochemistry of surface water of Koudiat Medouar Basin, Algeria

Hydrochemistry of surface water in Koudiat Medouar Basin, Algeria was used to assess the quality of surface water for determining its suitability for drinking and agricultural purposes. In the three stations, there is a good correlation between the electrical conductivity and elements Ca, Mg, K, Cl, SO4 and HCO3. In order to determine the geochemical nature of water, the data was interpreted using the Piper diagram wherein the results show the predominance of Ca-Mg-HCO3 or Ca-Mg-HCO3-Cl water type in the Oued Reboa, Ca-Mg-HCO3 or Ca-Mg-Cl-HCO3 water type in the Oued Timgad and Ca-Mg-Cl-HCO3 water type in the Reservoir dam. Principal components analysis results revealed that surface water quality was mainly controlled by geology, agricultural uses and domestic discharges. All the surface water samples in Oued Timgad fall in the field of C3S1, indicating high salinity and low sodium. Most of the surface water samples in Oued Reboa and in the reservoir dam fall in the field of C2S1, indicating medium salinity and low sodium. Based on RSC values, all the samples of the three stations had values less than 1.25 and were safe for irrigation.Key words: Surface water, principal component analysis, drinking and irrigation water quality, Koudiat Medouar Basin, Algeria

Multivariate statistical characterization of groundwater quality in Ain Azel plain, Algeria

Multivariate statistical techniques, cluster and principal component analysis were applied to the data on groundwater quality of Ain Azel plain (Algeria), to extract principal factors corresponding to the different sources of variation in the hydrochemistry, with the objective of defining the main controls on the hydrochemistry at the plain scale. Q-mode hierarchical cluster analysis grouped 54 groundwater samples into three clusters, that is, relatively less saline water (group 1), mixed water (group 2) and blended water (group 3), based on the similarity of groundwater quality characteristics. Principal component analysis, applied to the data sets of the three different groups obtained from hierarchical cluster analysis, resulted in four, five and three latent factors explaining 83.21, 83.36 and 87.30% of the total variance in groundwater quality data sets of group 1, group 2 and group 3, respectively. The varifactors obtained from PCA indicate that the parameters responsible for groundwater quality variations are mainly related to presence and dissolution of some carbonate, dolomitic and evaporite minerals; natural processes and water-rock interaction in the three water types. The results of this study clearly demonstrate the usefulness of multivariate statistical analysis in hydro chemical.Key words: Cluster analysis, principal component analysis, hydrochemistry, Ain Azel plain, Algeria

MiRNA let-7g regulates skeletal myoblast motility via Pinch-2

AbstractPost-transcriptional regulation of gene expression by RNA-binding proteins and by small non-coding RNAs plays an important role in cell biology. Our previous results show that in murine skeletal myoblasts, the expression of Pinch-2, a focal adhesion remodeling factor that regulates cell motility, is repressed by an RNA-binding protein IMP-2/Igf2bp2. We now show that the expression of Pinch-2 is also regulated by the miRNA let-7g. Let-7g and IMP-2 repress Pinch-2 expression independently of each other. A knock-down of let-7g leads to an increase in Pinch-2 expression, and to a decrease of cell motility, which can be reversed by a simultaneous knock-down of Pinch-2. We conclude that let-7g controls the motility of mouse myoblasts in cell culture by post-transcriptionally regulating the expression of Pinch-2

Assessment of nutrient contamination in surface water, case study of Ain Zada Dam (North-East of Algeria)

In order to evaluate the impact of potential pollutions on the water quality in the watershed of the upstream of wadi Boussellem (North-east of Algeria), the evolution of the chemical composition of waters of the Ain Zada dam was studied over a period of ten years. Using a linear  model  of  trends and a  principal  components  analysis  (PCA)  methods,  have  been detected and quantified for the substances that are connected with the fertilizers and domestic effluents. An increasing concentration is observed for most of these substances. The increase of 88% in COD, 66% in BOD5  and the decrease of 4.3% in pH, suggests a degradation of O.M 85% by microorganisms. This degradation was accompanied by a decrease of 2% of O2dis  content. The large increases of E.C 76%, NH4  290% and NO2  100%, are related to a marked  increase  in  fertilizers  applications  and  the denitrification  of NO3  where  latters declined by 77%. These increases are related also to the large amount of human and animal organic materials and industrial waste dumped.Keywords: Pollution; Eutrophication; wadi Boussellem; microorganisms, fertilizer

Chronic low back pain and the transdiagnostic process: How do cognitive and emotional dysregulations contribute to the intensity of risk factors and pain?AbstractBackground and aimsMethodsResultsConclusionsImplications

Background and aims Based on a transdiagnostic approach, this study assesses the impact of cognitive and emotional processes (difficulties in emotional regulation, impulsiveness, rumination and somatosensory amplification) on the psychological risk factors of chronic low-back pain. Methods The study was carried out with 256 patients with chronic low-back pain. All the variables were assessed through a booklet of 10 validated questionnaires. Multiple regression analysis and moderation analysis were performed. Results Predictors included in multiple regression models explain 3%-42% (adjusted R2) of the variance in psychological risk factors. Moreover, analyses reveal a significant moderator effect of somatosensory amplification on the link between fear-avoidance beliefs linked to work and pain intensity (F(3;250) = 12.33; p = .00), of somatosensory amplification and brooding on the link between depression and functional repercussions (FR) on everyday life (F(3;252) = 13.36; p = .000; F(1;252) = 12.42; p = .00), of the reflection dimension of rumination on the link between the helplessness dimension of catastrophizing and FRs on sociability (F(3;252) = 37.02; p = .00). There is also a moderation analysis with a significant trend concerning the lack of emotional awareness and the difficulties in controlling impulsive behaviours. Conclusions Our results indicate an important role of some dimensions of difficulties in emotional regulation, somatosensory amplification and rumination in the increase in negative affects and dysfunctional beliefs, and in the links between those psychological risk factors and pain/disability. Implications This study identifies some cognitive and emotional dysregulations substantially involved in work-related chronic pain. This contribute to put in place psychotherapeutic protocols to tackle these deficits and dysregulations in a relevant way

Future-oriented repetitive thought : pessimistic view of future in patients with Alzheimer disease

Objective: In this study, we, for the first time, evaluated future-oriented repetitive thought in patients with Alzheimer disease (AD), that is, how they think and worry about the future. Methods: We administered the Future-Oriented Repetitive Thought scale to 34 patients with AD and 37 control participants. This scale assessed 3 categories of future-oriented repetitive thought: (1) pessimistic repetitive future thinking (eg, “I think about the possibility of losing people or things that are important to me”), (2) repetitive thinking about future goals (eg, “I make specific plans for how to get things that I want in life”), and (3) positive indulging about the future (eg, “When I picture good things happening in my future, it is as if they were actually happening to me now”). Results: Analysis demonstrated more pessimistic repetitive future thinking, but less repetitive thinking about future goals and positive indulging about the future, in patients with AD than in control participants. Conclusion: Our findings demonstrate a pessimistic view of future in patients with AD, which is possibly attributed to hopelessness and depression