سليمة بوجلة, صادق محمد الامين, محمودي احمد

كلية العلوم الاقتصادية والتجارية وعلوم التسيير-جامعة أحمد بن يحيى الونشريسي - تيسمسيلت · الجزائر

moniuue chaaya, SUZANNA ADNAN ALMA’ALI

كلية العلوم الصحية-الجامعة الأمريكية في بيروت · لبنان

Adolescence is a vulnerable period in molding occlusion and is when disparities in malocclusion are aggravated by social inequalities. The aim of this study was to assess how social inequalities contribute to the burden from malocclusion in adolescents.A comparative cross-sectional study of secondary school adolescents aged 11-18 years attending public and private schools in Beirut-Lebanon.A sample of 656 adolescents aged 11-18 years attending 7 public and 9 private schools were screened by a calibrated examiner. Crowding and sagittal, vertical and transverse indicators of malocclusion were recorded. Parents answered a questionnaire on child- and family-related demographic, socio-economic (SE) and behavioral factors. Adolescents answered the Child Perceptions Questionnaire on oral health-related quality of life (OHRQoL). The modified index for orthodontic treatment need (IOTN) was computed. Multiple logistic and linear regressions were performed to explore the determinants of sagittal malocclusion (overjet), crowding and IOTN and to associate IOTN with OHRQoL.One in seven adolescents is in need for orthodontic treatment. Malocclusion and treatment need (IOTN) were comparable between private and public schools. After adjusting for appropriate variables, income was the strongest predictor of overjet and IOTN. Economically disadvantaged children had strikingly elevated odds of being in need for orthodontic treatment (OR=23). Age and childhood feeding mode significantly predicted overjet. Mouth breathing showed a positive association with crowding and IOTN. Bottle feeding duration was negatively associated with crowding severity. Adolescents in definite need for treatment reported significantly lower OHRQoL.The burden from unmet orthodontic treatment need is unequally distributed along the social spectrum. The implications for inequities in quality of life are contrary to the concepts of social justice and the fundamentality of oral health as a universal right. Our findings highlight the importance of promoting time

Salah Chelbi, K. Tahar Chaouch, Mehamed Ezziania, Mourad Abada

كلية التكنولوجيا-جامعة سعد دحلب - البليدة · الجزائر

خيرة بورنان, وهيبة بونويقة

كلية العلوم الانسانية والاجتماعية-جامعة محمد بوضياف - المسيلة · الجزائر

Semnaoui Abdelkader, شعيب مسعود

كلية علوم المادة-جامعة ابن خلدون – تيارت · الجزائر

Dans ce travail, nous nous sommes intéressés à l’étude de la fixation du plomb et Cadmium sur la résine phénolique (raison). Afin de préparer et caractériser la résine «Phénol-Formaldéhyde » à l’aide des techniques, Infra-Rouge IR, analyse enthalpique différentielles, viscosimètre, nous avons déterminé les facteur conditionnant le processus de fixation :Cinétique, équilibres en conditions batch.

فتيحة بسام, ختة بالحديدي, مسعودة مرسلي

كلية الآداب واللغات-جامعة أحمد بن يحيى الونشريسي - تيسمسيلت · الجزائر

Soumaia Kadri, Amal Ben Hammouda, Zohra Ghani

كلية الآداب واللغات-جامعة غرداية · الجزائر

The present study examines the effect of using visual aids on improving pupils’ writing skills at middle school. To achieve this end, thirty-seven (37) pupils of fourth-year level were chosen from the population of Ali Ben Abi Taleb Middle School in Ghardaia as participants of this study. The group was selected for the purpose of conducting an experiment on the effect of the independent variable “using visual aids” on the dependent variable “teaching writing skill”. The data gathering tools that were used to carry out this investigation were a pretest, a posttest, and a teachers’ questionnaire. Firstly, a pretest which consisted of an activity about writing a paragraph about a favorite teacher was administered to the selected group. Then, it received treatment as the experiment procedure requires but with different teaching techniques, i.e., the selected group was taught through using different kinds of visual aids. After the treatment period (two weeks), a posttest comprising an activity about writing a letter to the freedom fighter Zohra Drif was administered to the same group. After collecting and analyzing the required results, we deduced that visual aids have a positive effect on teaching writing regarding the pupils’ best performance in the posttest. In addition, we realized that there was a significant difference between pretest and posttest results. So, we can validate our hypothesis and conclude that visual aids enhance the teaching of writing skills because they increase memorization, acquisition, and comprehension.

سمير بن محاد , لبوخي أمباركة

كلية العلوم الاقتصادية والتجارية وعلوم التسيير-جامعة محمد بوضياف - المسيلة · الجزائر

حيدر مهدي

الجامعة التكنولوجية · العراق

Halima Saadia Oulad Mir, Saïd Belghit, Zineb Oulad Hadj Youcef

كلية علوم الطبيعة والحياة وعلوم الأرض-جامعة غرداية · الجزائر

L’objectif de notre étude est l’isolement, à partir du blé dur, des moisissures et l’étude de leur pouvoir producteur de mycotoxines. Pour cela, nous avons collecté quelques échantillons de blé dur à partir de différents points de commerce à Métlili, une commune de la wilaya de Ghardaïa. L’isolement, effectué par la méthode directe des grains sur les milieux PDA et Sabouraud additionnés de chloramphénicol, nous a permis d’obtenir 10 isolats fongiques contaminants. Après une identification préliminaire macro- et microscopique, ces isolats ont été affiliés à quatre genres : Alternaria (40 %), Ulocladium (30 %), Aspergillus (20 %) et Penicillium (10 %). L’extraction des mycotoxines a été réalisée globalement à partir du substrat de blé ainsi qu’à partir de chaque isolat fongique inoculé sur les milieux solides CMA et CYA. La détection a été effectuée par chromatographie sur couche mince (CCM) sous lumière UV à 365 nm. Les résultats ont montré plusieurs taches séparées par CCM et fluorescentes sous UV. Cependant, leur identification approximative à l’aide de révélateurs chimiques a révélé, après utilisation du nitrate d’argent, la présence de citrinine au niveau du substrat de blé, ainsi que la production d’aflatoxine G1 par Aspergillus et d’aflatoxine B1 par Penicillium sp.1 après utilisation de H₂SO₄.