Showing 6 results for Babai
M Rezaian, F Bagheri , Sh Farnia , Z Babai ,
Volume 1, Issue 3 (7 2003)
Abstract
In a survey from 1999 to 2001, a total of 354 samples of soil and water were colleted from different areas and examined for the presence of AcanthamoebaandNaegleria spp. After sieving, filtration and centrifugation, samples were examined for the free living protozoa ( amphizoic amoeba ). Concurrently, a sediment of each sample was cultured in the non-nutrient agar medium enriched by E.coli. In the end, 10 Acanthomoeba spp. and 3 Naegleria sp. were isolated. Besides, we diagnosed one case of human Acanthomoeba infection in a person residing in the area.
A Choobineh , F Golbabaie ,
Volume 3, Issue 2 (3 2005)
Abstract
The use of biological safety cabinets (BSCs) in laboratories has greatly increased over the last few decades. BSCs are used in laboratories to protect both the scientists and the experiments from contamination by biological hazards during tissue culture procedures. The function of BSCs depends upon the HEPA filtration, the fan performance and the airflow patterns in the cabinet. To ensure BSCs proper functioning, regular performance evaluation tests are necessary. Failure to observe this may lead to direct and indirect losses. The objective of this study which was conducted at a biological research center was to evaluate the performance of seven present BSCs used in different laboratories. Based on BS 5726 (1992), two sets of measurements were performed: a) Determination bioaerosol concentration in the cabinet and b) inflow and downflow velocity measurements at the cabinet.
The results revealed that the lowest and the highest bioaerosol concentrations were 0.2 cfu/m3 and 1.33 cfu/m3, respectively. The lowest inflow mean velocity was found to be 0.33 m/s which was far less than the recommended value in BS 5726 (0.7 m/s). The highest inflow velocity was 1.1 m/s. The lowest downflow velocity equaled to 0.09 m/s which was below the recommended value (0.25- 0.5 m/s). The highest downflow measured was 0.55 m/s.
As a conclusion, in general, none of the BSCs evaluated in this study provided sterile atmosphere at the cabinets. In no case, airflow patterns met the recommended values proposed in BS 5726.
M Baniasadi , Gh.r Babaie , H Zeraati , F Memari ,
Volume 4, Issue 1 (2 2006)
Abstract
Background and Aim: The purpose of this study was to assess the accuracy of the bootstrap method in logistic regression and to explore the method's use in logistic regression models in cases where the sample size is insufficient.
Materials and Methods: We use data from 150 patients who had undergone surgery at the Cancer Institute, Emam Khomeini hospital during from 1999 to 2001. Then we drew repeated samples of size 50 from these 150 patients.
Results: Applying ordinary logistic regression, an appropriate model we fitted to the initial data. Then confidence intervals and standard errors were computed for all regression coefficients.
There are many situations where the sample size is insufficient and conditions for using ordinary logistic regression are not met. In these cases the use of the bootstrap method not only produces more accurate estimations of regression coefficients, but with repeated sampling, produces estimates very close to the true values. This holds for the estimation of regression coefficients, confidence intervals and standard errors of coefficients.
Conclusion: In this study we show the optimal number of replications and the optimal sample size when using the bootstrap method in studies involving relatively small sample sizes.
F Golbabaie, M Ostadi, K Mohammad, V Ostadi, M Rismanchian, A Tirgar, Sj Sahtahery,
Volume 5, Issue 3 (4 2007)
Abstract
Background and Aim: Exposure to hexavalent chromium in plating operations is associated with skin ulceration, contact dermatitis, respiratory tract irritation, cancer, and kidney damage. We investigated the possibility of using biological monitoring to assess exposure to hexavalent chromium in chrome-plating workers. We compared mean Cr6 concentrations in the breathing zone plus urine chromium, β2 microglobulin (B2M), and N-acetyl-B-D- glucosaminidase (NAG) at the end of the working shift. Then we assessed the correlation between exposure to hexavalent chromium and biological indicators.
Materials and Methods: This study involved 45 chrome platers (Cases) and 40 zinc platers (Controls) in Isfahan. Air and urine samples were collected at the end of the work shift. Measurement of Cr6 concentrations in the workers' breathing zone was performed using the NIOSH Methods 7600. Urine Cr levels were determined by atomic absorption spectrophotometry, with a graphite furnace (Shimadsu, AA680). B2M and NAG were measured by Kits.
Results: Overall, geometric mean of hexavalent chromium concentrations in the breathing zone was significantly higher among chrome platers (14.577 μg/m3) compared to zinc platers (0.862 μg/m3, p<0.001). Moreover, the mean urine Cr concentrations were higher in chrome platers (9.198 vs. 1.811 μg / g creatinine, p<0.001). Similarly, there were significant differences between mean NAG in chrome platers (12.608IU/gr creatinine) and zinc platers (6.824 IU/g creatinine, p<0.001). Differences in B2M concentrations were not significant (p>0.05). A significant correlation was found between Cr6 concentrations in the chrome platers' breathing zone and their urinary chromium levels (r= 0.838, p<0.001). A similar association was found between concentrations of Cr6 and NAG in the breathing zone (r= 0.304, p<0.05).
Conclusion: As urinary B2M concentration did not change significantly, it may not be a sensitive indicator in evaluating exposure to hexavalent chromium. There were significant differences between mean urinary Cr and NAG concentrations in the two groups. The significant correlations between Cr and NAG concentrations indicate that these markers may be suitable indicators of exposure to hexavalent chromium. Our results indicate that NAG is an early indicator of renal dysfunction in chrome platers.
F Kargar, Sj Shahtaheri, F Golbabaie, A Barkhordari, A Rahimi Forushani,
Volume 8, Issue 3 (23 2010)
Abstract
Background and Aim: Lead is a toxic metal used in different industries and occupational and environmental exposure to it is quite likely to occur. Because of its high potential toxicity, serious damages to those exposed to it are common. Since the ceramic industry, in which lead is used, is considered a domestic industry in Iran, in this study occupational exposure of glaze workers to lead was assessed in a ceramic industry.
Materials and Methods: A total of 55 glaze workers (39 tillers and 16 potters) were selected as the case group. Association of lead concentration with several variables, including work shift, work type, ventilation system, and the number of extra work hours during the previous month, was determined. A sampling pump (SKC Co.) and ester cellulose filters with a pore size of 0.8 µm, 37 mm in diameter, were used for sampling. The flow-rate was adjusted at 2 l/min based on the NIOSH 7300 method. After sampling, filters were transferred to the laboratory and digested in a mixture of nitric acid and per chlorate solution (4:1) and analyzed by ICP-AES. To minimize probable errors and pollution during sampling and sample handling, samples were also taken from employees in the administration department to serve as control. Spiro metric tests were performed on both the case and the control groups.
Results: The lead concentrations were higher than the threshold limit value (TLV) (0.17 mg/m). Independent t-test showed that there was a significant relation between concentration of the lead present in the breathing zone air and 2 independent variables, including shifts work (morning and afternoon) and the ventilation system among tillers. Also, based on the one-way ANOVA, there was a significant relation between concentration of the lead present in the breathing zone and the number of extra working hours over the shift.
Conclusion: The mean lead concentration in the breathing zone was higher than the respective TLV. Considering the hazardous nature of lead, protective measures─ personal, occupational and environmental─ should be taken. Moreover, clinical examination of job applicants at the time of employment, as well as periodic examinations and Spiro metric tests on the workers, are also strongly recommended.
Ensiyeh Babaie, Fereshteh Bakhshian, Aram Karimian, Reza Saadatmehr,
Volume 17, Issue 3 (12-2019)
Abstract
Background and Aim: Considering that a person’s identity in formed during adolescence and that such identity formation is of particular importance in this period and the many factors that play important roles in it, the present study was conducted to determine the factors related with identity formation among high school students in Mazandaran Province, Iran.
Materials and Methods: This was a descriptive-analytic cross-sectional study. The participants were 394 high school students in Mazandaran Province, Iran selected by random cluster sampling. Data were collected using 3 questionnaires, namely, the Benion and Adams Identity Scale Questionnaire (EOM-EIS-2), the Identification Factors Questionnaire and a Demographic Questionnaire. For data analysis, Wilcoxon, Spearman correlation and linear regression tests were used.
Results: Over half (51.8%) of the participants were girls and 48.2% boys. The results of regression analysis showed that the factors studied (family, personality, school, community and culture and media) could explain 22.7%, 11.2%, 10.5% and 21.2% of the variance in turbulent, early, delayed and advanced self-identification in adolescents, respectively.
Conclusion: Based on the results of this study, it is recommended to organize parenting and student training courses and make the school environment more favorable for the students, as well as include extracurricular activities in the school to help students identify themselves more easily.
