Showing 6 results for Rahimifard
Volume 3, Issue 4 (12-2017)
Abstract
Background: Enterobious vermicularis (E. vermicularis) is one the most common parasitic infection among children.
Objectives: The present study aimed to determine the prevalence rate of enterobiasis among preschool children in Mazandaran province, northern Iran.
Materials and Methods: In this cross–sectional study, 653 preschool children were recruited via the cluster sampling method during April 2013 to Feb 2014. A questionnaire was administrated to parents by an interviewer and determined children’s socio-demographic characteristics, personal hygiene, and healthy behaviors. The Graham technique was applied for diagnosis. Data were analyzed using logistic regression model and chi-square test.
Results: In a total of 653 examined subjects, the prevalence rate of E. vermicularis was 19.4%, among which 40.9% were male, and 59.1% were female. The highest and lowest prevalence rates of E. vermicularis were found in Neka (61.4%) and Tonekabon (1.6%) districts, respectively. A significant association was found between infection and residency, parental occupations, parental education, number of family members, changing underwear, sterilization of linen clothing, taking daily bath, boiling or ironing clothes.
Conclusions: The high prevalence rate of E. vermicularis infection in this study proves the stability status of enterobiasis in this area, posing a risk for children there. Systematic control of infection in children is proposed.
Volume 7, Issue 29 (12-2019)
Abstract
The concept of power and its relation with ideology is one of the basic components of critical discourse analysis. In this article, the power position of one of Shah Abbas Safavi's chivalrous, named Hosein Kord Shabestari, is analyzed according to sthe face-threatening and face-saving acts against Shah Abbas's enemies. In the face-threatening act, Hosein Kord puts himself in the power position fearlessly and the audience in accepting the power position in different ways of expressions. In the face-saving act, there is a high frequency of face-saving acts for Hosein Kord and it sometimes belongs to Shah Abbas at a lower level. So far as these two acts are concerned, it is found that a chivalrous named Hosein Kord is in a high place, sometimes even higher than the Shah Abbas's place. This is why he uses face-threatening acts against Shah Abbas. The aim of this study is to show the position of Shah Abbas's chivalrous especially Hosein Kord so far as ideology is concerned.
Volume 18, Issue 120 (February 2021)
Abstract
In this study, PET-CMC bilayer nanocomposites films containing different levels of zinc oxide nanoparticles (ZnO NPs; 0%, 1%, 2%, 3%, 4%) were prepared and characterized. For better attachment of CMC on Polyethylene terephthalate (PET), atmospheric plasma pretreatment was used. The water vapor permeability, moisture, mechanical and microbial properties of the films were analyzed. Also, in order to investigate the effect of plasma treatment on improving the properties of bilayer films, a comparison was made between plasma treated and untreated bilayer films using FTIR test. Results showed the formation of polar groups such as C=O and OH on the PET surface following the plasma treatment which improved the adhesion of the two layers of polymer to each other. The water vapor permeability of PET-CMC films containing ZnO NPs decreased compared to the pure film with increasing the ZnO NPs percentage. Increasing the nanoparticles percentage had a positive impact on the tensile strength and increased this factor from 123.77 to 466.80 MPa, while the elongation at break decreased from 48.38% to 10.59%, and the nanocomposite films were revealed more resistant compared to the pure PET-CMC film, which facilitates the transport and storing of the foodstuffs. In addition, the presence of ZnO NPs in PET-CMC films exhibited antimicrobial activity against Escherichia coli and Staphylococcus aureus. In general, this research verifies improvement in physical, mechanical, and microbial characteristics of PET-CMC nanocomposite films along with the increasing of ZnO NPs. Our findings suggest that plasma-treated PET/CMC films have the potential for application in food antimicrobial packaging and can extend the shelf-life of packaged food as active packaging.
Volume 19, Issue 122 (April 2022)
Abstract
Promising secondary metabolites of brown algae have been given particular importance, due to their various biological activities. In the present study, two extraction methods including maceration and ultrasound were performed to prepare extracts from brown algae including Padina distromatic, then, aimed to evaluate antioxidant, antimicrobial, and anti-Alzheimer’s activities of extracts. Padina algae extract prepared by ultrasound method had higher total phenol (43.25 mg GAE/g) and flavonoid content (24.59 mg QE/gDA). However, the maximum antioxidant activity was observed in algae extract prepared by maceration method. Padina algae extract prepared by ultrasound method had the highest inhibitory activity of acetylcholinesterase and the strongest inhibition of nitric oxide production was observed in this extract. Escherichia coli and Listeria innocua bacteria were more resistant to Padina algae extract than other microorganisms and the results of microbial test showed that Padina algae extract prepared by ultrasound method was more antimicrobial than maceration method. Collectively, the obtained results provide valuable evidence for antioxidant, anti-Alzheimer, and antimicrobial activity driven by Padina distromatic extracts which can highlight their possible approach in the therapeutic utilization.
Volume 19, Issue 123 (May 2022)
Abstract
In recent decades, the demand for the use of functional compounds in food and pharmaceutical products has increased. The aim of this study was to compare the phytochemical compounds and antioxidant, anti-Alzheimer's and antimicrobial properties of Padina distromatic and Sargassum angustifulium algae extracted by ultrasound. The results showed that butanoic acid was the most important substance in Padina and Sargasum extracts. Total content of polyphenols, flavonoids and IC50 index of Padina extract and sargasum 43.45 and 46.63 mg GAE/g, flavonoid content 24.59 and 55.40 mg QE/g and IC50 index 10.38 and 30.77 g/ml respectively. The inhibitory activity of acetylcholinesterase (AChE) of Padina and Sargassum algae extracts was 42.5% and 25.16%, respectively. Nitric oxide (NO) inhibitory results showed that nitric oxide inhibitory activity increased with increasing the concentration of both Padina and Sargassum algae extracts (from 50 to 400 mg / ml). However, Padina algae extract had the strongest NO inhibitory activity at all concentrations. Padina extract had more antimicrobial properties compared to the algae extract of sargassum. The minimum inhibitory concentration (MIC) of Padina extract at 12.5 mg/ml was obtained on Staphylococcus aureus. Padina extract at 50 mg/ml had a bactericidal effect on Staphylococcus aureus. Finally, Sargassum extract should be used as natural antioxidant and Padina extract as natural anti-Alzheimer's and antimicrobial components.
Volume 20, Issue 138 (August 2023)
Abstract
Microencapsulation of bioactive compounds in lipid carriers, such as liposomes, in addition to improving stability during storage by increasing bioavailability and controlled release, increases the efficiency of these compounds in vivo. The studies conducted on Padina algae show the existence of a high level of phenolic and antimicrobial compounds. Also, this alga has a significant amount of polyphenols with antioxidant and anti-AChE (acetylcholinesterase) properties, which can be used as a supplement to improve neurological disorders. Therefore, the purpose of this research was to produce and investigate the structural properties of nanoliposomes containing Padina algae extract using the heating method. The particle size of nanoliposomes produced at varying levels of lecithin and loaded extract was obtained in the range between 318 and 60 nm. The resulting values for the polydispersity index and zeta potential indicate the uniformity of the produced particles along with the high electrostatic repulsion between the particles. The ability to load liposome particles at the lowest level of wall substance and the highest concentration level of the extract reached 52.8±0.3% in this research. Evaluation of the morphological characteristics of the structure using a transmission electron microscope shows the formation of uniform particles with a spherical geometry. The results of this research show the ability to produce a liposome structure containing Padina algae extract with suitable structural properties. These results can improve the prospect of possible use of this extract with a therapeutic approach.
