Showing 8 results for Hamidian
Volume 1, Issue 2 (winter 2018)
Abstract
Dispersion type of layered clay plated in aqueous media creates different structures and affects the final properties of its suspension. On the other hand, the presence of different electrolytes in some industrial applications affects the stability of clay suspensions. Considering the application of clay nanoparticles in various industries and the importance of this subject, in this research, the effect of preparation method, nanoparticle concentration, type and ionic strength of electrolytic medium and time elapsed on the stability behavior of laponite nanoparticles suspensions were studied. The results showed that preparing of the suspensions indirectly, results in more stable samples. It was observed that with increasing of sodium chloride concentration, the repulsion between the clay plates decreased and the phase separation and instability of the suspensions increased at higher NaCl concentrations. Furthermore, it was seen that in all electrolyte media, gel-like structure develop with increasing of nanoparticle concentration. In presence of bi-valance CaCl2 salt, most of suspensions were unstable and have two phases and increasing of this salt concentration had not significant effect on their stability. In electrolyte media containing mono- and bi- valance salts (studied in this research), concentration of calcium cation determines the type of stability behavior of laponite nanoparticles suspensions.
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 4, Issue 4 (Fall 2018)
Abstract
Aims: The aim of this study was species identification and analysis of species of Leishmania isolated from clinical samples.
Materials & Methods: The samples were collected from patients that were infected from different parts of Iran. After microscopic examination, we used PCR method for the ITS1 (internal transcribed spacer 1) RFLP method (digestion with and for phylogenetic construction, DNA sequencing of
Findings: Two samples from Khorasan province (Mashhad) were Leishmania (L. ), while others were Leishmania major (L. ). L. more variable compared with L. . The molecular sequencing differences between L. to geographical distribution. Based on the results of PCR product in the gel electrophoresis and DNA sequencing for L. L. , the DNA sizes were between 350 and 369bp. The RFLP for L. L. and one respectively. The sequences all samples from central parts are the same, but there is difference with the samples isolated from of Iran.
Conclusion: The sequences of of Leishmania major separated from Damghan and Esfarayen are different from other samples. Similarity of DNA sequences of North-East part of Iran of L. from central parts was 99%. The similarity of two isolates of L. 96%. The most similarity of Leishmania isolated was 95% with Indian isolate and the most similarity for Leishmania major was 99% with Friedlin strain.
Volume 9, Issue 4 (3-2020)
Abstract
The main purpose of this study is to predict the behavior of employees according to perception of possible changes in their organizational resources. This research aims to discover the latent behavioral intentions which individuals showing in common, within an organizational ecosystem through an objective approach. Using sequential exploration strategy, the research was implemented through 5 main steps and research model has been verified by means of experimental and empirical methods. The ecosystem studied in this study, was Iranian state and semi-state banks, which were precisely studied in 416 subjects. Also, in order to obtain a model for predicting the organizational behavior of employees, at first, behavioral intentions were typologized by conservation of resources approach, and then modeled with fixed and random effects in form of mixed equations. Results showed that predictions of human behaviors at the ecological level of resources have great commonalities that can be identified by a resource-based approach. The results also showed that the behavioral intentions of employees in Iranian state and semi-state banks in threatenedsocial support is to be passive, andin the presence of positive or negative perceptual interaction from leader, this tendency could change from " being passive” to "trying to retain" in both cases. Identifying the boundary points of changing behavioral intentions and the distance of employees’“behavioral intention" from these points was another finding of this study that could be a guide for regulating effective interventions of leadersin the studied ecosystem.
Volume 10, Issue 4 (12-2024)
Abstract
Iranian mosquitoes (Diptera: Culicidae) include 73 species across eight genera. The fauna of mosquitoes in Guilan Province comprises 34 species classified into seven genera. A faunistic study of mosquitoes was conducted with emphasis on an aggressive biter mosquito reported by local people in Anzali and Rasht Cities of Guilan Province, northern Iran. Collections were made by hand catches using manual aspirators, light traps, BG lure traps and ovitraps during August–November 2023 in all 17 counties of the province. Species identification was carried out using morphological keys and molecular analysis of the barcode region of the cytochrome c oxidase subunit I (COI) gene. In total, 29 larvae and 896 adult specimens were collected which were not recognized as a species previously known to occur in the province. The aggressive biter mosquito was morphologically identified as Aedes albopictus (Skuse, 1895). The sequences of the barcode region of the COI gene of the species were generated for the first time in the country. This species was collected in 14 counties of the province. Thus, the mosquito fauna of Guilan Province increased to 35 species.
Volume 11, Issue 2 (6-2025)
Abstract
There is little information about the lice infesting birds and mammals in Guilan Province of northern Iran besides their importance in medicine and veterinary medicine. A good series of lice were collected from a road-killed great egret, Ardea alba (Ciconiiformes: Ardeidae), in Rasht City of Guilan Province in the summer of 2023. The collected lice were preserved in 80% ethanol and cleared in 10% KOH. The microscope slides of specimens were prepared using Berlese’s fluid. The chewing lice were morphologically identified as Ciconiphilus decimfasciatus (Boisduval & Lacordaire, 1835) (Phthiraptera: Menoponidae) from the great egret, as a new host record for Iran. A taxonomic note was presented for the species. Also, a checklist of the Phthiraptera of Guilan Province as well as their hosts and distribution were presented including three suborders, four families, ten genera and 12 species. This checklist is considered preliminary for further investigation.
Volume 21, Issue 1 (Spring 2017)
Abstract
In arbitration in equity, arbitrator seeks to resolve disputes in an equitable manner, which is not achievable through the application of legal strict rules. Amiable compositeur, ex aequo et bono and equity are common terms that in relation to amiable and equitable arbitration have frequently been utilized by the arbitration tribunal and the conflict parties in arbitration clauses and awards. Nonetheless, there is no consensus amongjurists as to this issue whether each of these expressions and concepts imply in different methods of decision making according to equity. In fact, it is not exactly specified what is difference between awards based on equity and those made based on ex aequo et bono ,and what is difference between arbitration in equity and assessing the dispute and act in the proceedings as an amiable compositeur?
Volume 26, Issue 4 (Winter 2022)
Abstract
The flow of accurate and reliable information is critical to enhance market transparency and efficiency as well as investor protection. However, it is not possible to achieve this merely by requiring the executives to report financial information, and corporate governance should inevitably devise a mechanism to monitor the accuracy of the information contained in financial reports. Therefore, along with the internal control process, parties, known as gatekeepers, have been designed outside the issuer’s organizational structure to evaluate the accuracy of the information disclosed.. In the capital market, there are some gatekeepers who do not perform gatekeepingfunctions, as a matter of principle, but implicitly verify the accuracy of the issuer’s financial information and provide the basis for investors to have confidence and make informed decisions only while performing their primary duty. These parties are therefore referred to as indirect gatekeepers. Securities analysts, equity underwriters, attorneys and legal advisors are among this group of gatekeepers. This article has attempted to examine the concept, function, and effectiveness of examples of these types of gatekeepers in Iranian and American law. For this purpose, information was collected in the Documentary and library form and then evaluated in a comparative method. The results of the analysis show that because these persons inherently are not gatekeepers, they naturally encounter conflicting situations when performing their primary duties and gatekeeping functions, which weakens their effectiveness in achieving gatekeeping objectives. As a result, requiring certification based on the explicit assurance of the accuracy of the information is one of the most important suggestions that have been made to improve their efficiency and effectiveness. However, in order to better ensure the quality of financial information, the capital market should use, in addition to indirect gatekeepers, other professional persons created in principle to perform gatekeeping functions in the market, known as direct gatekeepers.