فهرست مطالب niloufar akbarzadeh

the purpose of this study was to apply and evaluate the effectiveness of the mobile learning model in transferring the concepts of academic courses and in particular the statistics course on the social networking context.

The research method was quasi-experimental with pre-test and post-test design in both experimental and control groups. The statistical population of this study includes all students studying at the Free and Public Universities of Tehran in the 1397 academic year who were studying. From this statistical population, 90 individuals were selected and assigned to the experimental and control groups (45 each) randomly. The experimental group completed a 17-session WhatsApp social networking course on statistical methods and the control group attended the same course in person. Data collection tools included a questionnaire to measure satisfaction of learning / classroom environment and a test of academic achievement to assess learners' learning effectiveness.

Concerning the components of effectiveness (content, instructor and facilities), the results showed that learners in the experimental group had more satisfaction with the class and better learning compared to the in-person courses.

Based on the findings of this study, it can be concluded that applying social network based mobile learning model in university education increases the effectiveness of educational courses.

In this investigation, we have reported the synthesis of the complex [Th(5,5´-dmbpy)3](NO3)4](1) that 5,5´-dmbpy =5,5´-dimethyl-2,2´-bipyridine. This complex has been characterized using spectral methods (FT-IR, UV-Vis, 1H-NMR and luminescence), elemental analysis and the Cyclic Voltammetry (CV) method. The FT-IR data shows that 5,5´-dimethyl-2,2´-bipyridine (5, 5´- dmbpy) ligand adduct to metal centers by nitrogen atoms. Electronic spectra of (1) shows ligand field transitions and charge transfer (CT) bands. Electrochemical data for the complex in the DMF solution show reduction and oxidation processes for the Thorium ion and ligand. The interactions of complex (1) with FS-DNA have been investigated using UV–Vis and gel electrophoresis. The binding constant (Kb) was calculated using UV–Vis technique (Kb=3.5×105). Also, DNA cleavage was studied using agarose gel electrophoresis. The antibacterial properties and fluorescence property of complex (1) have also been examined. The in vitro biological screening effects of the complex and ligand were tested against different types of bacterium and [Th(5,5´-dmbpy)3](NO3)4](1) shows antibacterial properties.

Folate is another form of folic acid, which is known as one of the B vitamins. It is utilized as an additive by women during pregnancy in order to prevent the neural tube defects. The present study reports on the fabrication of electrochemical sensor for the determination of folic acid using Co3O4 nanoparticles. The suitability of Co3O4 nanoparticles as a modifier for the electrocatalytic detection of folic acid in aqueous solution was investigated by cyclic voltammetry (CV), differential pulse voltammetry (DPV) and chronoamperometry (CA) techniques. The fabricated Co3O4 NPs/GCE sensor exhibited sharp and intense peak towards the electro-oxidation of folic acid as compared to bare electrode. The linear calibration plot of folic acid was obtained from 1.0 to 900.0 µM with the detection limit of 0.8 µM. The modified electrode was use for the detection of folic acid in real samples and found to produce satisfactory results.

Since, hair loss can be accompanied by worries about general appearance and can cause feeling of being bad looking and low self-esteem and although it can produce anxiety, it has effects on social functions. This study was designed to assess psychological and behavioral impacts of hair loss on patients. This cross-sectional study was performed on two groups of case and control (98 person in each group). Both groups were matched for age, marital status and education. Then, the two groups were given four self-administrate questionnaires, Hospital anxiety and depression scale (HADS), Rosenberg self-esteem scale, World health organization quality of life instrument (WHOQOL-BREF), and Body image disturbance questionnaire (BIDQ). Finally, the results were compared using independent t-test. There were no significant differences between the case and control groups in anxiety and depression, quality of life, and self-esteem. Nevertheless, there was significant difference between the two groups in body image disturbance (P < 0.001). Patients with hair loss clearly suffer from feeling of being bad looking and this can affect their social functions and their presence in community.