Showing 9 results for Habibian
Volume 14, Issue 1 (6-2014)
Abstract
This paper presents the influences of adding nano-silica on electrical resistivity of cement paste, because the electrical resistivity test is one of the non-destructive test in durability issues that can help us to assess the resistance of cement is facing by ion attacks. Furthermore, because the transition area in concrete is one the weak parts of concrete. It is tried to improve the durability properties of transition area that is mainly filled by cement and water. So, this research focuses on assessing the electrical resistivity of cement paste when it is integrated with pozzolan material in nano and micro scale. In to end, the cement paste without any additive is compared with cement paste integrated with nano-silica and micro silica. The amounts of additive materials are limited to 2.5%, 5%, 7.5% and 10% of cement weight. The two types of nano-silica have been used in this research that are liquid suspended nano-silica and solid nano-silica particle. So, the 3 different pozzolan materials were used that include two different nano silica (liquid and solid) and micros silica. Then all the results have been compared with results of ordinary cement paste as reference point. Then the samples were tested at age of 3, 28 and 90 days. The results show that before age of 3 days, adding nano silica or micro silica led to decline the electrical resistivity because the pozzolanic reaction is not started, but at age of 28 days the top achieved electrical resistivity belong to the samples which has nano-silica in its mixture. However, after age of 28 days, just the samples with micro-silica have electrical resistivity growth. The results of the samples that contain the both of nano-silica and micro-silica are between the results of samples that contain micro-silica and the samples which integrated by nano-silica. Keywords:
Volume 18, Issue 2 (6-2015)
Abstract
Objective: Diabetes is a common metabolic disorder that a one of the important factors in the etiology is considered to oxidative damage. The present study intends to study the effect of swimming training with Arbutin on total oxidant status (TOS) and total antioxidant status (TAS) in kidney tissue of Alloxan-induced diabetic rats.
Methods: We randomly divided 42 male Wistar rats that had an average weight of 195 g to 220 g into 6 groups (7 rats per group) - control, diabetic, arbutin, diabetic-arbutin, diabetic-swimming training, and diabetic-combinatorial. Swimming training protocol consisted of 5 days/week for 6 weeks at 5-36 min/day. Diabetes was induced with alloxan [90 mg/kg, intraperitoneal (ip)] in the rats. Arbutin (50 mg/kg, subcutaneous) was administered for 5 days/week. The rats were killed 48 hours after the last treatments and kidney TOS and TAS levels were evaluated. One-way analysis of variance was used for data analysis.
Results: After six weeks of supplementation with arbutin, swimming training and the combination of swimming training and arbutin, we observed a significant decrease in TOS (P<0.05) and elevated TAS (P<0.05) levels in the alloxan-induced diabetic rats.
Conclusion: The combined effect of swimming training and arbutin supplementation can play a major role against renal oxidative stress by modulating total oxidant and antioxidant status in alloxan-induced diabetic rats.
Volume 19, Issue 6 (12-2019)
Abstract
Traffic management in cities necessitates the implementation of comprehensive strategies and correct scheduling of demand management in order to reach sustainable development goals. Transportation is the main contributor to urban air pollution imposing high cost to communities. Emission from mobile sources in Tehran is responsible for 85 percent of the total air pollutant emissions. Therefore, assessment of emission rates in different districts may be used as the base for air quality management decisions. Due to the complexity of effective policies that lead to environmental sustainability for reducing the emissions of air pollutants caused by transportation using Multi Criteria Decision Making (MCDM) approaches could be an effective and the most appropriate approach.
Sadr overpass is one of the east to west main corridors in Greater Tehran Area and embeds a large amount of traffic volume. Therefore, assessing different and alternative traffic scenarios and its modeling incorporating air pollution concerns, promotes imposition of the most environmentally preferred traffic demand management policies. This study aims to investigate different alternatives to access Sadr Overpass of Tehran using different ramps and estimating the air pollution caused by the traffic volumes in each access mode. These scenario alternatives have been evaluated using MCDM. Therefore, the different access routes via ramps of Sadr Overpass to its main lanes are considered in terms of the two formerly implemented scenarios. The first implemented scenario is defined as the air pollution caused by the traffic volume due to limitation of access that was implemented before 21 June of 2017. In this period of time, in the east to west direction, the limitation of access to Sadr Overpass was imposed via lower level Sadr ramp in between 7 to 10 AM and during the closure of this ramp, vehicles could access the overpass and Niayesh Tunnel via Qeytarieh and Kaveh ramps. In other side of the overpass, the first ramp leading the lower level is closed at 15 to 21 and vehicles could not access Sadr Expressway via this ramp. The second scenario is defined at the period of time that the limitation of access in both directions, was imposed all over during the day time permanently that is from 21 June 2017 till now. Air pollution caused by each mode of transportation is modeled using IVE that is an International Vehicle Emission Model to simulated emissions from motor vehicles. The IVE model uses local vehicle technology levels and its distribution and includes emission factors for estimating the air pollutants. Furthermore, these scenarios have been compared using Multiple-Criteria Decision Making approach and the evaluated criteria are the emission rates of motor vehicles, velocity and level of service (LOS) of the expressway. The results show that the evaluated scenarios are ranked as per their level of priority as the first and the second implemented scenarios, respectively. Also, it is shown that in the east to west direction, closure of lower level Sadr ramp in the morning peak time of traffic volume reduces the emission rates of CO pollutants by 10 percent in that time. Similarly, in the west to east direction, limiting the access to the lower level Sadr ramp during 16-17 hours reduces the CO emissions by 3.5 percent.
Volume 21, Issue 1 (Spring 2018)
Abstract
Aims: Environmental pollution and exposure to toxic metals such as lead can induce to chronic and malignant diseases and has considerable complications including carcinogenicity, immunotoxicity, and neurotoxicity. The aim of this study was to compare the protective effect of clove essential oil and vitamin C on the toxicity of lead accumulation in quail eggs.
Materials and Methods: The current clinical trial study was performed on 360 quail chicks in a poultry farm of the Veterinary Medicine faculty of Shahrekord University in 2016. Quails were randomly divided into 6 groups with different diets. After intervention, at the age of 42 days, 5 eggs were gathered from each group. An Atomic Absorption Spectroscopy (AAS) was used to determine the tissue accumulation of lead in quail eggs. To measure the amount of lipid oxidation, TBARS (Thiobarbituric Acid Reactive Substances) test and Malondialdehyde (MDA) was measured. The data were analyzed using one-way analysis of variance and Tukey's post hoc test by GraphPad Prism 5 software.
Findings: The mean of lead accumulation in quail eggs in the group receiving lead and clove essential oil was significantly lower than those receiving lead (p<0.05). Also, the mean concentration of malondialdehyde in the lead intake group was significantly higher than that of the two groups receiving the lead plus the essential oil of clove or vitamin C (p<0.05).
Conclusion: The use of clove essential oil in quail diet has a more protective effect than vitamin C on the toxicity of lead accumulation in quail eggs.
Volume 21, Issue 1 (Spring 2018)
Abstract
Aim: Zinc oxide nanoparticles are known as important metal oxide nanoparticles and are used in many medical and biological fields, but concerns are rising due to their potential effects on some organs. The aim of this study was to investigate the effect of aerobic exercise on renal angiotensin-II and angiotensin type 1 receptor levels in administered Rats with Nano Zinc Oxide.
Materials and Methods: In this experimental research, 35 male Wistar rats were randomly divided into control, salin, nano zinc oxide, exercise and exercise plus nano zinc oxide groups. Zinc nitric oxide (1mg/kg) was injected intraperitoneally, 5 days a week into exercise and exercise plus nano zinc oxide groups. The exercise program consisted of progressive running on a treadmill (5 sessions per week for 4 weeks). Two days after the last application, the rats were euthanized. The kidney tissue is separated and angiotensin-II and angiotensin type 1 receptor were measured. Data were analyzed by SPSS 20 software using one-way ANOVA and Tukey’s post hoc test.
Findings: After 4 weeks of chronic treatment with nano zinc oxide, the levels of angiotensin-II and angiotensin type 1 were significantly increased. Exercise significantly reduced renal angiotensin II and angiotensin type 1 levels. However, these variable levels in exercise plus nano zinc oxide group still were significantly higher than control group (p<0.05).
Conclusion: Aerobic exercise reduces renal angiotensin II and angiotensin type 1 levels in Administered Rats with nano zinc oxide.
Volume 21, Issue 3 (Fall 2018)
Abstract
Aims: The aging process is associated with alterations in brain neuroangiogenic factors. Exercise training plays an important role in the development of brain, especially in the elderly. The aim of this study was to investigate the effect of high-intensity interval training on some of the brain neuroangiogenic factors of old female rats.
Materials and Methods: The present experimental research was carried out on 14 two-year-old female Wistar rats, weighing 250-300 grams. The rats were randomly divided into 2 control and exercise groups (7 rats per group). The old animals performed 10 bouts of 1-min high-intensity treadmill running (20–34 m/min), separated by 2 minutes of rest 3 days a week for 8 weeks. The rats were killed 48 hours after the last exercise training session and brain vascular endothelial growth factor (VEGF) and transforming growth factor‐β1 (TGF‐β1) levels were evaluated by ELIZA method. The data were analyzed by SPSS 20, using independent T-test.
Findings: VEGF levels in the exercise group were significantly higher in the brain tissue of old rats than in the control group. TGF-β1 brain levels decreased compared to the control group.
Conclusion: High-intensity interval training improves age-induced neuroangiogenic changes in the aged brain via the up-regulation of VEGF and decrease in TGF‐β1 level.
Volume 23, Issue 1 (Winter 2020)
Abstract
Aims: Coccidiosis is one of the most common infectious diseases in poultry that causes huge economic losses. Glycyrrhiza glabra is a medicinal plant that used traditionally. The aim of the present study was to evaluate the effect of aqueous and alcoholic extracts of this plant on the Emeria tenella oocysts in vitro.
Materials & Methods: The unsporulated oocysts were obtained by inoculation of 14th day-old broiler chicks with 75,000 oocysts. To obtain sporulated oocysts, 9g of feces samples was soaked in 2% potassium bichromate and incubated at 27°C for 72h. Aqueous and alcoholic extracts of Glycyrrhiza glabra in concentrations of 1, 2, and 5% were prepared and oocysts were exposed to these extracts for 48 hours. Thereafter, the number of sporulated and unsporulated oocysts were counted at 1, 12, 24, and 48 hours. In order to prevent any error, the experiments were repeated three times.
Findings: Both extracts of Glycyrrhiza glabra in all tested concentrations cause a significant reduction in the number of sporulated and unsporulated Eimeria tenella oocysts compared with control (p<0.05). The rate of inhibitory effect of extracts had a direct relationship with exposure time, and inhibition was continuously increased over time.
Conclusion: Alcoholic extracts of Glycyrrhiza glabra had a better effect than aqueous extracts. 5% alcoholic extract had the best effect. However, further studies are needed to find the best dose for the most anticoccidial effects and also to show its effects on other species of Eimeria and in animal models.
Volume 23, Issue 5 (Winter 2021)
Abstract
Aims: VitaminD deficiency is a common problem, and it is related to increased risk of metabolic syndrome and cardiovascular disease. But vitaminD has a beneficial effect on insulin secretion. The aim of this study was to investigate the effectiveness of vitaminD supplementation with Pilates training on vitaminD status and insulin resistance in overweight men.
Materials & Methods: This quasi-experimental study was conducted in 50 men (45-55years) with overweight. Volunteers were selected through convenience sampling and were divided into Pilates training, VitaminD, combined, and control groups. The Pilates program was performed 3sessions/week, 60-75 minutes for session, with the intensity of 50-75% of reserve heart rate. The oral VitaminD received 50000 units of weekly. Data was analyzed by paired t, ANOVA and KruskalWallis tests with a p-value less than 0.05.
Findings: According findings, 60% and 40% of the subjects had deficienciy and insufficient levels of vitaminD, respectively. 8 weeks of Pilates training, VitaminD consumption and the combined intervention were associated with a significant increase in 25(OH)D and decreased glucose, insulin, and IR (P<0.05). But the effect of combination interventions and VitaminD consumption was greater on increasing levels of 25(OH)D than Pilates training. Combination intervention was also associated greater decrease in insulin and IR compared with VitaminD supplementation (P<0.05).
Conclusion: It seems that VitaminD, Pilates training and a combination of these interventions can improve the glycemic status and VitaminD in overweight people with low levels of vitaminD. Therefore, maintaining a normal status of vitamin D helps to develop the health of overweight people.
Volume 24, Issue 1 (Spring 2020)
Abstract
Introduction
Achieving dynamic and vibrant locations has always been one of the major concerns of planners, designers and city managers. This concept in urban neighborhoods, formed at higher levels due to the continued presence of inhabitants as well as the quality of human-location and human-human relations, is influenced by the factors associated with human connection with its residential place, such as place attachment. This case study examines the effect of the multi-dimensional concept of place attachment and its dimension on the vitality of urban neighborhoods.
So the questions of research are:
- What is the effect of place attachment of residents on vitality of Ahvaz city neighborhoods?
- Which component of place attachment has more effect on vitality of Ahvaz city neighborhoods?
Methodology
The method used in the study is a mixed research method (qualitative-quantitative) and practical in terms of purpose. In the qualitative section, the data gathering tool was a semi-organized interview with 26 people including 14 women and 12 men and a coding analysis method along with a four-step reduction of concepts. In the quantitative part, data was collected through a questionnaire, and data analysis was carried out using SPSS software and drawing the structural equation of variables
’ relationships within Amos Graphic software. Statistical society was Ahvaz city residents and sample size was 392 respondents that
had completed in selected neighborhood (Bagh-Sheykh and Kian-Abad) based on randomized population balancing method (respectively 101 and 291 questionnaire).
Results and discussion
In
the first step, qualitative semi-organized interview resulted in 17 components and 5 dimensions for the place attachment variable. Quantitative part of research show
s that all 5 analyzed components of place attachment are greater than supposed average (3) and the lowest amount is for place dependence. Residents
analysis of neighborhoods vitality is significantly greater than supposed average and in Bagh-Sheykh neighborhood
, it is greater a little
more than Kian-Abad, although this
difference is in not statistically significant. While confirming the fit of the designed model of the main research variables (value χ^2⁄df =4.908 & RMSEA= 0.100), also
, the results of the quantitative part supports the direct and significant impact of place attachment on urban vitality (the standard coefficient of the route is 0.806 and the significance coefficient is less than 0.0001). Also, the direct effects model of five-fold dimension of place attachment on urban vitality, confirms the direct effect of place identity dimensions, emotional-cognitive connection, and place dependence on the vitality of urban neighborhoods; showing that place identity is the most effective dimension of place attachment concerning urban vitality.
Conclusion
This research confirmed the positive effect of place attachment of residents on vitality of Ahvaz city neighborhoods and showed that place identity is the most important effective component of place attachment on vitality of Ahvaz city neighborhoods. So
, in general,
since forming of vitality in urban neighborhoods is connected with place and affected by place-base communities, yet vitality is one of components of urban spaces qualities, so this concept
is related with qualities of people-place links such as place attachment.