فهرست مطالب m. shahi

This research aimed to study the effect of virtual social networks on self-care of the users concerning COVID-19.

This survey research was conducted from April to June 2020. The study sample included social network users (WhatsApp, Instagram and Telegram) in Hormozgan province who were selected by convenience sampling. The measuring instrument was an online questionnaire extracted from Dorthea E. Orem’s self-care model, Gerbner's cultivation theory and Kaplan and Haenlein's media-richness-theory. Modeling was carried out using SPSS 28 and Amos 26 software.

The results of explanation and modeling in the present research not only indicate a significant and direct relationship between the independent variables of Presence and interaction in the social networks and user orientation to the type of social network with the dependent variable of users concerning COVID-19 self-care (p<0.0009), but also, 45% of changes in COVID-19 self-care variable was covered by a set of social networking indices. Structural equation modelling in the self-care variable also showed that independent variables; Presence and interaction in the social networks and user orientation to the type of social network had the highest and lowest effects on the psychological support dimension with a standard coefficient of 0.99 and the dimension of awareness and attention to COVID-19 effects and outcomes with a standard coefficient of 0.95, respectively.

As a result, we suggest that health officials and disease control and prevention centers use the potential of social networks such as WhatsApp and Instagram in self-care of users concerning COVID-19.

A convenient synthesis of , n-benzoiel-1,3-diaryl-2-(para formyl) azaphenalene derivativesunder microwave irradiation as well as conventional thermal method using by a one-pot condensationreaction of the aromatic dial, 2,7naphthalenediol, carboxylic acids and aqueous ammonia (25 %) isreported. Microwave irradiation has resulted in the reduction of time from 10-20 min to a 1-2 minutes.

In this paper we report upon the preparation and characterization of electrospun nanofibersof doped polyaniline (PANI)/poly(methyl methacrylate) PANI-PMMA/AgNO3 by electrospinningtechnique. At first, Doped polyaniline (PANI) was obtained by the polymerization of aniline using chemicaloxidative polymerization in the presence of ammonium peroxydisulfate (APS). The doped PANI wasdedoped by ammonia solution. Then, the electrospinning method was applied on the solutions involvingPANI-PMMA, PANI-PMMA-AgNO3. The as-prepared PANI-PMMA and PANI-PMMA-AgNO3 compositenanofibers were investigated for structural characterizations by means of SEM, FTIR and UV-VIS. SEMtechnique was used to investigate the morphology of the accumulated fibers or particles on the Alsurface collector. SEM revealed the nanofibers with the diameter Micro to nanofibers formed a nonwovenmaterial with highly porous and agglomerated structure. The presence of Ag in the case of Agcontaining composite nanofibers was confirmed by EDAX.

In this paper we report upon the preparation and characterization of electrospun nanofibersof doped polyaniline (PANI)/poly(methyl methacrylate) PANI-PMMA/AgNO3 by electrospinningtechnique. At first, Doped polyaniline (PANI) was obtained by the polymerization of aniline using chemicaloxidative polymerization in the presence of ammonium peroxydisulfate (APS). The doped PANI wasdedoped by ammonia solution. Then, the electrospinning method was applied on the solutions involvingPANI-PMMA, PANI-PMMA-AgNO3. The as-prepared PANI-PMMA and PANI-PMMA-AgNO3 compositenanofibers were investigated for structural characterizations by means of SEM, FTIR and UV-VIS. SEMtechnique was used to investigate the morphology of the accumulated fibers or particles on the Alsurface collector. SEM revealed the nanofibers with the diameter Micro to nanofibers formed a nonwovenmaterial with highly porous and agglomerated structure. The presence of Ag in the case of Agcontaining composite nanofibers was confirmed by EDAX.

A convenient synthesis of , n-benzoiel-1,3-diaryl-2-(para formyl) azaphenalene derivativesunder microwave irradiation as well as conventional thermal method using by a one-pot condensationreaction of the aromatic dial, 2,7naphthalenediol, carboxylic acids and aqueous ammonia (25 %) isreported. Microwave irradiation has resulted in the reduction of time from 10-20 min to a 1-2 minutes.

The objective of this study was to evaluate the effect of the replacement of different levels of wheat straw with cottonseed plant on performance, digestibility, blood parameters, and rumination behavior of Dalagh ewes. Therefore, 15 ewes with three treatments and five replications were used in a completely randomized design. The treatments consisted of 0, 50, and 100% replacement of wheat straw with cottonseed plant. The whole period of the experiment was carried out in 35 days, consisting of seven days for the adaptation period. Ewe body weight was recorded weekly. Fecal and feed samples were collected on days 31 to 35 for five consecutive days from each treatment to determine digestibility. Blood sampling was done on day 35 and 4 hours after morning feeding. On days 29 and 30, the rumination behavior of ewes was estimated for 24 hours. Results indicated that dry matter intake and weight gain in the second treatment (50% cottonseed plant) increased and feed conversion rate was decreased, but generally performance and digestibility were not affected by treatments. Also, there was no significant difference between experimental treatments in digestibility. Results of the present experiment showed, by increasing the amount of whole cottonseed plant in ewe diets, the concentration of triglyceride increased (p < /em><0.05). The most and the least concentrations of glucose were observed in the first (contained 0% cottonseed plant) and second treatment (contained 50% cottonseed plant), respectively. With the reduction of wheat straw levels in the diet, chewing time and rumination behavior were increased. The difference was not significant in eating, rumination, and chewing behavior. Based on the results of this experiment it could be possible to replace the cottonseed plant in the diet of ewes.

In this study, a simple and efficient one-pot synthesis of tetrahydrobenzo[b]pyrans from the three-component reaction between dimedone, different aromatic aldehydes and malonitril compounds using NH4Al(SO4)2•12H2O (Alum) as a catalyst at 80 °C is described. As a part of our research works in the synthesis of pyrimidine derivatives containing biological activities, a series of novel pyrano[2,3-d]pyrimidine derivatives 2 were synthesized via reaction of tetrahydrobenzo[b]pyrano derivatives 1 with different reagents in suitable yields. The structures of the entire synthesized compound were well analyzed and their structures established by using various spectral techniques (1H NMR, 13C NMR and IR). Furthermore, all compounds were evaluated for their in vitro antimicrobial activity against different bacterial strains. Antibacterial behavior of product was studied based on reference Gram-positive and Gram- negative bacteria.