Showing 62 results for Dai
Volume 1, Issue 2 (NO. 2- 2009)
Abstract
The identity of a society is a tool for distinguishing different nations from each other based on a common concept or predetermined concepts. The strong sense of identity can be considered as a social capital. In addition, social capital and social identity are the result of tangible social relationships, which are understandable by the society. They Also have strong affects on each other. With respect to this relationship, this paper verifies the relationship between identity and social capital. The data were gathered from the world values data of 70 countries according to the definitions of the variables. The results by logistic regression showed that there is a positive and significant relationship between social identity and social capital.
Volume 1, Issue 4 (Fall 2023)
Abstract
Today, carbon dioxide emission is one of the concerns of all countries in the world, so in this paper, we examine the effect of export quality, energy efficiency, and economic complexity on CO2 emissions per capita during the period of 1990 to 2014 in emerging economies. For this purpose, first, energy efficiency is calculated using mathematical programming methods (DEA). Then, the effect of export quality, energy efficiency, and economic complexity on per capita carbon dioxide emissions in the panel of emerging economies is investigated using panel quantile regression. The energy efficiency results show that the average energy efficiency of the studied countries had been increasing from 1990 to 2014. The lowest efficiency score among the studied countries is related to China. The results of quantile regression indicate that the export quality and consumption per capita of fossil fuels have a positive and significant effect on CO2 emissions per capita in all quantiles. The results also show that the coefficient increases by moving in the level of quantiles, so that, the highest effect coefficient of export quality on CO2 emission is related to the quantile 90th and about 0.874. Energy efficiency has a negative and significant effect in all quantiles except 90th, and the highest coefficient of influence (0.133) is related to quantile 10th. The increase in economic complexity increases the co2 emissions in all quantiles except 10th, and the highest coefficient (about 0.487) is related to quantile 90th.
Volume 2, Issue 2 (6-2017)
Abstract
Background: Studies indicate that Muscularskeletal Disorders (MSD) are among the first ranks in terms of economic and healthcare cost of which back pain is in the first place.
Methods and Materials: This study was a cross-sectional study. The study participants were 100 students who were studying at the Tarbiat Modares University in the year of 2016. Data on back pain was collected via the standardized Quebec questionnaire. Quebec questionnaire contains 20 questions with 6 options by which pain intensity is ranked between 0 and 100. Collected data was analyzed using SPSS software version 16. In order to determine the status of musculoskeletal disorders and associated factors, descriptive statistics and chi-square test were used.
Results: Totally 100 students who living in Tarbiat Modares University with mean age of 26.1 ± 3.1 were participated in the study. According to the results, 84% of the students (N = 84) were single, 15% (N = 15) were married, and 1% of the students (N = 1) was divorced. Eighty seven percent of the students (N = 87) were studying in Master degree and 10% of the students (N = 10) were studying in PhD degree. The majority of the students (60%, N = 60) did not report any musculoskeletal pain. However, forty students (40%) suffering from MSD.
Conclusion: This study was designed to investigate the musculoskeletal disorders among the students. As this study revealed a high percentage of the students were suffering from a kind of MSD, designing more researches to confirm these findings and also to design proper preventive intervention are strongly recommended.
Volume 2, Issue 3 (7-2016)
Abstract
Background: Leptospirosis has been recognized as an important reemerging infectious disease caused by pathogenic Leptospira spp. A major challenge of this disease is the application of a basic research to improve diagnostic method. Outer membrane proteins of Leptospira are potential candidates that could be useful in diagnosis. Among them the lipL41 is an immunogenic protein which is present only in pathogenic serovars. In order to evaluate genetic conservation of the lipL41 gene, we cloned and sequenced this gene from Leptospira interrogans serovar Canicola.
Materials and Methods: Following the DNA extraction from the serovar, the lipL41 gene was amplified and cloned into pTZ57R/T vector and transformed into the competent E. coli (Top10). Recombinant clones were confirmed by colony PCR and DNA sequencing. The related sequences were then analyzed and compared with the sequences in the Genbank database.
Results: PCR amplification of the lipL41 gene resulted in a 1065 bp PCR product. The PCR based on the lipL41 gene detected all the pathogenic reference serovars of the tested Leptospira spp. It was revealed that in Iran the homology of the lipL41 gene between vaccinal and clinical serovars of Canicola was 100%. It also showed >95.9% homology with other pathogenic serovars in Genbank database, which indicates genetic conservation of this gene.
Conclusion: Because of the conservation of lipL41 gene among different strains of Leptospira and its exclusive presence in leptospira, it was revealed that the cloned gene could be further used as a good candidate for developing diagnostic methods such as ELISA and as positive control in diagnostic PCR.
Volume 3, Issue 1 (1-2017)
Abstract
Background: Many comprehensive epidemiological studies have been done about fungal infections, which areone of the publichealth and therapeutic problemsin different communities. Since prevalence rate of fungal diseases and their etiological agents are changing over time,the aim of this study was to provide additional information about visceral fungal infections (VFIs) in order to understand the ways of their dissemination, to prevent disease transmission, to eliminate contamination sources and predisposing factors, and to provide effective ways for their treatment.
Materials and Methods: Samples were taken from the lesion of patients referred to medical mycology laboratory of Tehran University of Medical Sciences from 2014 to 2015. After providing direct wet mount of Potassium hydroxide (KOH) smears from these samples and samples sent from other medical centers, culturing on Sabouraud Dextrose agar with chloramphenicol (SC) and brain heart infusion agar (BHI) media was performed. After growth, species were identified.
Results: From a total of 295 suspected samples, VFI was proved in 69 cases (23%). Aspergillosis was the most prevalent infection among VFIs. Candidiasis, cryptococcosis and mucormycosis were in the late orders, respectively. Two patients were also infected by Trichosporon. The predominant species in aspergillosis infections was Aspergillus flavus, and the predominant species in candidiasis infections was Candida albicans.
Conclusion: According to the obtained results on the prevalence rate and incidence of VFIs between male and female patients in different age groups and also by taking into account the prevalent type of fungi and infectious site of patients’ bodies, it is possible to take appropriate action for the prevention and treatment of these kinds of diseases by using the important keys of these results to research and study etiological and underlying factors involved in these diseases.
Volume 3, Issue 2 (5-2017)
Abstract
Background: Many studies have been conducted on fungal infections which are known as public health and therapeutic problems. Since the prevalence rate of the fungal diseases and their etiological factors are changing over time, the purpose of this study was to identify the prevalence rate of superficial-cutaneous fungal infections (SCFIs) in order to understand the ways of their dissemination, to prevent diseases transmission, to eliminate contamination sources and predisposing factors, and to take appropriate action for their treatment.
Materials and Methods: After referral to medical mycology laboratory of Tehran University of Medical Science from 2014 to 2015, the patients were subjected to mycological examinations, and sampling of patients’ lesions was performed. Directsmears were prepared with Potassium hydroxide. Samples were cultured on Sabouraud dextrose agar medium, and species were identified.
Results: From a total of 916 suspected patients, 334 cases (36.5%) had SCFIs. Dermatophytosis was the most prevalent SCFI (55.7%), followed by cutaneous candidiasis (19%), tinea versicolor (14.3%), and non-dermatophytic molds (11%).Tineapedis was the frequent site of involvement. Trichophytonmentagrophytes was the predominant species of dermatophytosis.
Conclusion: According to the obtained results on the prevalence rate of SCFIs between male and female patients in different age groups and also by taking into account the type of the prevalent fungi and the involvement site of the fungal infection, it is possible to take appropriate action for prevention and treatment of these kind of diseases by using important keys of the results to research etiological and underlying factors involved in these diseases.
Volume 3, Issue 3 (9-2017)
Abstract
Background: Recently, the use of probiotics in preventing and treating the immune system diseases through changes in blood factors has attracted the attention of researchers. Therefore, the aim of this study was to evaluate the effect of Lactobacillus plantarum and Bifidobacterium B94 on changes of blood factors, influencing the autoimmune system diseases.
Materials and Methods: The rats used in this study were divided into four groups (n=10 each), including control (saline), damage with Ethidium bromide (EB), L. plantarum and Bifidobacterium B94 treatment groups. In damage and treatment groups, a single dose of 3μL EB was directly injected into hippocampus of rats for inducing demyelization. Also, in control group, the same amount of saline was used. Then 2×108 probiotic bacteria were administered by gavage for 28 days. Then serum calcium and cholesterol levels were measured. Data were analyzed by one-way ANOVA and Tukey post-hoc tests (p≤ .05).
Results: The results showed that level of blood serum calcium increased insignificantly in the L. plantarum and Bifidobacterium B94 treatment groups compared to control group. Also, the level of blood serum cholesterol decreased insignificantly in both treatment groups compared to control group.
Conclusion: Probiotics are used for preventing and treating some of the common autoimmune diseases such as MS. Previous studies showed that probiotics affects some of the blood parameters such as calcium and cholesterol while decrease or increase in these parameters is effective in the improvement of MS. Although no significant finding has been obtained in some of these studies, they have almost confirmed the recommendation of probiotic consumption.
Volume 4, Issue 2 (6-2018)
Abstract
Museum collections are national assets of any country and also are very susceptible to pest damage. Moreover pests in a museum, library or archive environment can cause severe damage to highly valuable and irreplaceable materials. Hence, constantly monitoring of the collections against pest activity is essential in museums. Dermestidae family is known as one of serious pests in the museum collections which feed on various products and cause high infestation. In current study, we present the results of monitoring of all parts of two buildings of The Niavaran Palace Complex, including the private library and Ahmad Shahi Pavilion in Tehran, Iran. The following species of the dermestids have been collected and recorded for the first time from Tehran and Niavaran Museum: Thylodrias contractus Motschulsky, 1839, Attagenus lobatus Rosenhauer, 1856, Anthrenus (Anthrenops) coloratus Reitter, 1881, A. (Anthrenus) picturatus picturatus Solsky, 1876. Moreover, Thylodrias contractus Motschulsky, 1839 is recorded for the first time from Iran.
Volume 5, Issue 2 (6-2017)
Abstract
Aim: Health literacy means having basic health information and services needed to make appropriate health decisions. The aim of this study was to assess the relationship between health literacy and knowledge in rural patients with type 2 diabetes mellitus.
Methods: This descriptive-analytic study was performed on 120 patients with type 2 diabetes patients in 2016 in two health homes of Hossein Abad and Kaghazi villages of Aran and Bidgol City in Isfahan Province. Sampling was done by census. Data were gathered by three questionnaires. They were valid and standard questionnaires including demographic, knowledge and HELIA. The data were analyzed by SPSS16 software using descriptive statistics, T-test, correlation coefficient and ANOVA.
Findings: In this study, the participants were 66.7% women, 29/2% worker, 5/8% employee, 4/2% retired, 5% unemployed, and the rest were housewives. The mean score of health literacy and knowledge was 13/82±2/20 and 114±23/21, respectively. The mean age of the participants was 48/88±9/57 years, the mean score of knowledge and health literacy of the participants was 13/82±2/20, 114±23/21, respectively. There was a significant relationship between health literacy and knowledge (p=0.007) and between health literacy and educational level (p<0.05). Also there was a significant difference in health literacy between men and women (p=0.001).
Conclusion: According to the results of the study on the relationship between health literacy and educational level, this study suggests that since the women have an axial role in family health, in order to improve the level of knowledge, the formal education level in rural women diabetic patients must be increased.
Volume 5, Issue 3 (Summer 2019)
Abstract
Aims: In imbalanced conditions, Candida species colonization as a normal microflora of human skin and some mucosal surfaces is replaced by invasive forms (budding yeast cells, pseudohyphae, and true hyphae). This study aimed to investigate the frequency of Candida species and candidiasis with emphasis on the presence and propensity of different Candida species for pseudohyphae and true hyphae formation in clinical samples taken from various clinical forms of candidiasis.
Materials & Methods: In this cross-sectional study (2018 to 2019), sampling was done from 492 patients suspected to candidiasis, referred to the Medical Mycology Laboratory. Employing direct microscopy and culturing methods, the Candida species were identified using morphological and biochemical characteristics and also PCR-RFLP and DNA sequencing.
Findings: From a total of 96 candidiasis patients, 44.9% were identified with superficial-cutaneous and 55.1% with visceral candidiasis. The most clinical strains were isolated from fingernail scrapings (33.2%), followed by bronchoalveolar lavage samples (17%). The mycelium was found in 55.2% of the cases, and the highest frequency was related to the nail specimens (34%, p <.05). C. albicans was the predominant species forming mycelium (69.8%), followed by C. tropicalis, but no mycelium was found in C. guilliermondii cases. Mycelium formation was observed more in patients with an underlying disease such as AIDS and organ transplantation (p <.05).
Conclusion: Non-albicans Candida species have also the propensity to induce an invasive form of mycelial in the skin and to increase internal organs temperature, exacerbating clinical symptoms. This finding is important for choosing proper antifungal treatments and should be taken into account by clinicians.
Volume 7, Issue 1 (Winter 2019)
Abstract
Aims: In recent years, global warming has increased the importance of carbon sequestration. The present study was conducted to survey the effect of banqueting and fire on soil organic carbon (SOC) sequestration in Atbatan rangelands of Bostanabad District.
Materials & Methods: For this purpose, using systematic-random strategy, composite soil samples were taken from fire happened 2 years ago (in 2 aspects of east and west), banqueting constructed 25 years ago (in 2 aspects of north and south), and control sites. The SOC was measured and results were analyzed, using two-way ANOVA.
Findings: On the contrary of interaction effect, the main effects of aspect and fire were significant on SOC. The SOC of the control site with 28.9 t/ha was higher than the fire site with 21.76 t/ha. The average SOC in the eastern aspect was higher than the western aspect as such the average amount of SOC in western and eastern aspects were 28.94 t/ha and 21.72 t/ha, respectively. Banqueting had an increasing significant effect on SOC, as such SOC of the treatment site was 34.47 t/ha compared to the control site with 22.21 t/ha. The SOC in the northern and southern aspects was not significantly different, and the SOC of southern and northern aspects equaled 28.45 t/ha and 28.23 t/ha, respectively.
Conclusion: In conclusion, according to the results of the study, the occurrence of fire in rangelands can reduce the amount of SOC. The rangeland banqueting increases the amount of SOC in both aspects.
M. H. Azizi, S. M. SayedDain, S. H. Payghambardoost,
Volume 8, Issue 4 (Number 4 - 2006)
Abstract
The effect of flour extraction rate on flour composition, dough rheological characteris-tics and the quality of Iranian flat breads (lavash, taftoon and barbari) and their staling rate was investigated. Flours with different extraction rates (70, 75, 80, 83, 86, 88, 90 and 93) were subjected to different tests. Resultes indicated that, by increasing the extraction rate, the amount of protein, fat, fiber, ash, wet gluten, water absorption and the color of the flours all increased but the moisture content, sedimentation value and falling number decreased. Rheological studies of doughs by farinograph showed a reduction in dough stability, whereas the dough mixing tolerance index increased along with the extraction rate. By using an extensigraph it was shown that dough resistance, extensibility and the area under extensigram curves were decreased by increasing the extraction rate. A study of the effects of flours with different extraction rates on bread quality, showed that the overall quality of breads is generally affected by the flour extraction rate. Sensory analy-sis of breads in respect to overall quality and staling indicated that the desirable rates of extraction for lavash, taftoon and barbari, breads are 88, 90 and 88 respectively.
Volume 8, Issue 4 (Fall 2020)
Abstract
Aims: Recognizing the environmental factors affecting plants structural trials and biomass is important to conserve plants as well as their ecosystem function, and services. Onobrychis aurea is a valuable forage that is distributed in the marl lands and is considered as an endangered plant species in Iran. In the present study, the ecological characteristics (plant traits) of this species has been investigated in detail.
Materials & Methods: For this purpose, structural traits and biomass of O. aurea were investigated in 12 ecological units with different topographical and soil conditions. Three soil samples were taken to 15cm depth, (0-15cm) in each ecological unit. The relationship between structural traits and species biomass with environmental factors was tested by redundancy analysis (RDA) method in 2016.
Findings: The results indicated that the soil characteristics including clay, lime and silt content play a more important role in the structural and biomass traits of O. aurea evidence show. Spatial and topographical factors, especially elevation and geographical aspects, had a smaller contribution in structural traits and species biomass in comparison with soil factors. Higher structural values were recorded in heavy textured alkaline soils. The slope percentages also have no significant effect on plant characteristics.
Conclusion: The present study indicated that the soil and topographic factors are very important for management of O. aurea. In general, it should also be emphasized that having good knowledge related to plant ecology as well as environmental condition could help managers to conserve and rehabilitate endangered plants.
Volume 8, Issue 4 (Fall 2020)
Abstract
Aims: Awareness about the effects of banqueting and fire on the vegetation in rangeland ecosystems is necessary for appropriate management. Regarding the importance of sustainable rangelands management and the lack of studies about fire and banqueting, the aim of the current study is to investigate the effect of rangeland restoration practices (banqueting with seeding) and also fire on plant functional groups in semi-arid region of Atbatan Rangelands, Bostanabad.
Materials & Methods: For this purpose, after choosing the treatments and control sites, via random-systematic method in each site, thirty 1-m2 plots were established along three 30-meter transects (there were 30 plots for each area and 240 plots in total). The canopy cover of plant species was recorded within the plots and categorized based on plant functional groups.
Findings: The results of statistical data analysis showed that the percentage of total cover in the north and south aspects of banqueting with 69.17% and 62.03% was significantly higher than the control sites with 52.53% and 48.03%, respectively. Fire in west aspect has reduced the percentage of vegetation (53.6%) compared to the control site (72.93%) whereas it did not have a significant effect in east aspect.
Conclusion: Generally, it can be stated that banqueting in the north aspect has more and increasing effect on plant functional groups but fire has a more complicated behavior in different topographic conditions (aspect) in relation to the banqueting and in west control site in term of the most studied parameters it has significantly more values than the other sites.
Volume 9, Issue 1 (Winter 2021)
Abstract
Aims: Biochar is a soil amendment used to improve soil quality and plant productivity in an agricultural application, and there were fewer researches to use it in rangeland species. This study aimed to determine if lignite and wheat straw biochar (WSB) could be used to promote Astragalus podolobus growth, inclusive Plant height, crown diameter, canopy cover, the volume of cover, leaf area, and leaf perimeter. In this study, it is assumed that WSB and lignite’s use will increase the growth of A. podolobus species. A. podolobus, as a palatable shrub from the Leguminosae family, is a native species of Turkmen Sahra.
Materials & Methods: A greenhouse experiment was designed with (WSB) and lignite, at 1.25%, 2.5%, and 3.75%w/w of soil in six replications. The soil texture was clay loam. Statistical analyses were performed by two-way analysis of variance using the SPSS16 statistical software.
Findings: In lignite application, the highest height, crown diameter, canopy cover, and volume of cover were observed for a 3.75% application rate after the 4th month and were 25.03cm, 23.52cm, 528.65cm2, and 15581cm3, respectively. While the highest values of these parameters for WSB were obtained for 2.5% of the application rate after the fourth month and were 22.62cm, 20.66cm, 401.66cm2, and 11318.3cm3, respectively.
Conclusion: Plant height, crown diameter, canopy cover, the volume of cover, leaf area, and leaf perimeter were promoted by increasing lignite dosage (3.75%) in the soil while nearly all parameters decreased at the same WSB incorporation dose.
Volume 9, Issue 2 (Spring 2018)
Abstract
Aims: In recent years, according the benefits of chloroplast transformation, the cultivation of transplastomic plants and their products have been increased. Due to their biosafety concerns, their identification and labeling have become more widely considered. The aim of this study was to present an optimal method based on polymerase chain reaction (PCR) and nanobiosensor for detection of transplastomic tobacco plants and compare their sensitivity.
Materials and Methods: In the present experimental research, aadA gene as a chloroplast selectable marker was considered to design specific primer and probe. In PCR method, after optimization of aadA gene amplification, its sensitivity was evaluated with different percentages of transplastomic DNA. In nanobiosensor method at first, the labeled aadA probe was immobilized on graphene oxide (GO) and, then, hybridization reaction was optimized to identify target DNA sequence.
Findings: The amplification of 800 bp DNA related to aadA gene was observed. The PCR reaction allowed up to 5% DNA transplostomy tobacco to reproduce the aadA gene. In results of nanobiosensor after immobilization of aadA probe on GO, fluorescence emission was quenched and by adding the trasplastomic tobacco, DNA was observed again. In this method, up to 1% transplastomic tobacco DNA, fluorescence emission was significant in comparison with control tobacco plant.
Conclusion: The PCR method can detect a transplastomic tobacco plant with 5% DNA sensitivity and detect biomarker sensitivity with 1% DNA sensitivity.
The PCR method can detect a transplastomic tobacco plant with 5% DNA sensitivity and nanobiosensor can detect with 1% DNA sensitivity. Therefore, nanobiosensor method is not only a reliable diagnostic method, in addition to the PCR method for detecting transplastomic plants, but also has a higher sensitivity.
Volume 10, Issue 1 (7-2020)
Abstract
The aim of this study was to investigate the effect of enamel plate on the frequency variation of theta, alpha and beta brain waves, with emphasis on gender factor as a demographic variable, to answer to following question: How is a cultural luxury item like a enamel plate changing in the comparison between males and females, considering bioelectric activity of the cerebral cortex is affected by the color element. This study is an applied research with semi-experimental design.
Electroencephalography was recorded in two regions of F3 and F4 in a commercial video of an enamel plate in four colors, blue, yellow, green and red; and in two groups of males and females. The data was recorded using Biofeedback System 2000 of the Sheffield Corporation during the commercial video demonstration. EEG data were processed using MATLAB software 2018 and statistical comparison was performed using SPSS software version 20 using multivariate analysis of variance analysis. Results showed that the color factor had no significant effect on the power of theta, alpha and beta band frequency. In contrast, the effect of gender was significant and the brain electroencephalography pattern of the participants without color was different in both males and females. The normalized electroencephalographic power of women in all colors was higher than mens’. Therefore, in a cultural luxury product, color cannot have a different effect on the electroencephalogram pattern of the frontal lobe of women and men, but the female cortex is more active than men when processing different colors.
Volume 10, Issue 2 (Spring 2022)
Abstract
A B S T R A C T
Aim This study was conducted to compare the effects of three types of light, medium and heavy grazing intensity on the plant functional groups across the Sahand summer rangeland.
Materials & Methods First, three areas with different grazing intensities were selected according to the field observations and collected information from herders. Then, the random systematic approach was applied to plant sampling across the selected sites. Afterwards, six transects were randomly established in the selected sites separately where ten plots were then localized on the compounding transects.
Findings The results of Duncan test indicate a significant difference in the average production, canopy cover percentage and litter percentage across the studied sites under different grazing intensities. The average characteristics of all plant functional groups in sites with different grazing intensities have significant difference at the level of 1%. In this regard, the highest averages with 487.8 kg. ha-1, 62.7% and 12.5% are related to the site with light grazing, respectively. Results revealed that the properties of perennial grasses and forbs in the region under light grazing intensity is higher than two other studied regions which were under medium and heavy grazing.
ConclusionThe finding of this research implied that the livestock grazing intensity can significantly affect the palatability classes and growth form of plants. Therefore, changes in grazing intensity is recommended as a management tool in rangeland improvement to improve vegetation characteristics and move vegetation towards equilibrium.
Volume 10, Issue 3 (Summer 2024)
Abstract
Background: The present investigation aimed to survey the in-vitro inhibitory effects of nitroglycerin against Candida albicans, Trichophyton rubrum, and Aspergillus flavus.
Materials & Methods: In the current investigation, 99 fungal isolates were gathered from patients referred to the Medical Mycology Laboratory of Tehran University of Medical Sciences. The disk diffusion method was done based on Clinical and Laboratory Standards Institute (CLSI) M44-S2 guidelines. Also, the microdilution method was performed base on CLSI guidelines for filamentous fungi (document M38-A2) and yeasts (document M27-A3).
Findings: In the disk diffusion method, all isolates of C. albicans (n=33, 100%) and A. flavus (n=33, 100%) showed sensitivity to nitroglycerin, whereas all isolates of T. rubrum (n=33, 100%) showed resistance to nitroglycerin. On the other hand, in the microdilution method, the minimum inhibitory concentration (MIC) of nitroglycerin against C. albicans and A. flavus isolates was 0.5 mg/mL, whereas the MIC of nitroglycerin against T. rubrum was 0.12 mg/mL.
The results showed that the MIC of nitroglycerin against dermatophytes was about one-quarter of its MIC against C. albicans and A. flavus, and this difference was statistically significant (p< .05).
Conclusion: Considering the potential and efficacy of nitroglycerin against yeasts and filamentous fungi (saprophytes and dermatophytes), complementary in-vivo and in-vitro studies should be done.
Volume 10, Issue 4 (3-2021)
Abstract
Today, more than ever, consumers are searching for authenticity. One of the valuable features of brand authenticity is that consumers are willing to pay primum price for products that they think are authentic. Authenticity has emerged as a consumer favorite feature that reflects a brand's sense of uniqueness, realism, or originality, helping marketers differentiate their brands from competitors. The present study examines the antecedents of brand authenticity and its impact on word of mouth (WOM). Consumers of Tavazeh nuts brand in Tehran constitute the statistical population of this research. 372 people were selected as the sample by available sampling method. Data were collected through a standard questionnaire. The reliability of the questionnaire was assessed by calculating Cronbach's alpha coefficient and its validity was assessed by first-order and second-order confirmatory factor analysis (CFA). SPSS24 software was used for descriptive statistics and structural equation modeling (SEM) with LISREL 8.8 software was used to test the hypotheses. The results of testing the hypotheses showed that brand nostalgia, brand heritage, brand legitimacy and brand clarity have a positive and significant effect on brand authenticity. Also, brand authenticity has a positive and significant effect on word of mouth (WOM).