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Staphylococcal Superantigens in Synovial Fluid of 62 Patients With Arthritis
S Noorbakhsh,A Tabatabaei,M Talebi-Taher
Tehran University Medical Journal , 2012,
Abstract: Background: Determining the etiologic causes of septic arthritis is of the most importance. Goal of this study was to investigate presence of staphylococcal enterotoxins A, B, C and Toxic Shock Staphylococcal toxin-1 in the synovial fluid of patients with arthritis. Methods: This cross-sectional study was performed in the Pediatric and Orthopedic Wards of Hazrat Rasoul Hospital in Tehran, Iran during 2008- 2010. Gram stains, conventional cultures, direct detection of soluble bacterial antigens were used to detect H. influenza, S. pneumonia, group B streptococci, and N. meningitidis while Latex particle agglutination test was used for staphylococcal supper antigens (by enzyme immunoassays) upon synovial fluid tapping of 62 individuals (5 mo to 16 yrs, mean=11 3.8 yrs). P<0.05 was considered statistically significant. Results: Positive SF cultures (n=11): 5 positive cases of S. aureus; 5 S. pneumonia; 1 H. influenza, and 1 Klebsiella. Positive gram stains: 10%; and positive LPA: 4%. Staphylococcal arthritis was diagnosed in 7 (39%) cases upon positive culture or positive gram stain. The most common type was TSST-1 (47%) and the least common was enterotoxin B (18%). Isolation of S. aureus (positive culture) was correlated to presence of enterotoxin A in synovial fluid but not to enterotoxins B, C or TSST-1. Conclusion: Staph. aureus had a prominent role in arthritis. 47% of cases with negative culture for S. aureus had at least one type of staphylococcal super antigens in the synovial fluid. Searching for antigens of usual organisms or staphylococcal supper antigens could be helpful for diagnosis and subsequent treatment.
Risk factors and antimicrobial susceptibility in ventilator associated pneumonia: a brief report
M Talebi-Taher,M Latifnia,SA Javad-Moosavai,M Adabi
Tehran University Medical Journal , 2012,
Abstract: Background: Ventilator associated pneumonia (VAP) is one of the serious complications of ventilatory support, occurring in ICUs. The aim of this study was to determine various risk factors associated with the acquisition of Acinetobacter infection and its antimicrobial susceptibility pattern.Methods: This cross-sectional study was performed in the ICUs of Rasoul-e-Akram Hospital in Tehran, Iran during the year 2011. A total of 51 endobronchial aspirates from intubated patients who had been clinically diagnosed to have VAP were studied bacteriologically. The in vitro susceptibility was determined by disk-diffusion and broth microdilution MIC methods.Results: Out of 51 patients with VAP, 35 (66.66%) had positive cultures for Acineto-bacter species. In vitro susceptibility test revealed that a high percentage of isolates were resistant to imipenem, piperacillin-tazobactam, third generation cephalosporines, and aminoglycosides.Conclusion: The antimicrobial resistance of gram negative bacteria, particularly Acine-tobacter species, is increasing and preventive measures need to be taken as a matter of urgency.
Varicella Zoster antibodies among health care workers in a university hospital, Teheran, Iran
Mahshid Talebi-Taher, Maria Noori, Ahmad-Reza Shamshiri, Mitra Barati
International Journal of Occupational Medicine and Environmental Health , 2010, DOI: 10.2478/v10001-010-0011-x
Abstract: Objectives: This study was designed to evaluate the immune status of health care workers against varicella zoster in a university hospital in Teheran, Iran, and to compare the history of chickenpox infection with the presence of varicella antibodies in this population. Methods: Serologic testing for varicella was performed for 405 health care workers with different job categories and at different age. The enzyme immunoassay was used for determining IgG antibodies against varicella zoster virus Results: A total of 405 health care workers, aged 19-50 years (median: 29 years), were examined. Of these, 289 (71.4%) were found to be seropositive. No statistically significant differences were observed between gender, age, or occupation, and seropositivity (p = 0.09, 0.75, 0.54. respectively). Statistical analysis revealed that the correlation between chickenpox history and seropositivity showed a 62.3% sensitivity, 72.4% specificity, 84.9% positive predictive value, and 43.5% negative predictive value. Conclusions: Serologic screening of health care workers is essential to determine their immunity to varicella, regardless of the age, occupation and history of infection. This population is recommended to be considered a target group for future immunization programs in Iran.
Serum Zinc Level in Children with Febrile Convulsion and its Comparison with that of Control Group
Fahimeh Ehsanipour,Mahshid Talebi-Taher,Nahid Vahid Harandi,Keivan Kani
Iranian Journal of Pediatrics , 2009,
Abstract: Objective: Febrile convulsion is the most common disorder in childhood with good prognosis. There are different hypotheses about neurotransmitters and trace element (such as zinc) changes in cerebrospinal fluid and serum, which can have a role in pathogenesis of febrile convulsion. The aim of the present prospective analytical case-control study was to determine whether there was any changes in serum zinc level in children with febrile convulsion during seizure.Methods: Ninety-two children aged 6 months to 5 years were divided into three groups: group A, 34 children with febrile convulsion, group B, 40 children having fever without convulsion, and group C, and 18 children with non-febrile convulsion. Serum zinc levels for the three groups were estimated by atomic absorption spectrophotometry (AAS). Data were analyzed to compare zinc level among the three groups using appropriate statistical tools employing SPSS 13.Findings: Serum zinc levels of groups A, B, and C had a mean value of 76.82±24.36mg/1, 90.12±14.63 mg/1 and 94.53±17.39 mg/l, respectively. Serum zinc level of group A was lower than those of the other two groups (P<0.006). It was also lower in group B than in group C (P<0.006).Conclusion: These findings revealed that serum zinc level decreases during infection; this decrease was more significant in patients with febrile convulsion.
Helicobacter pylori in Diabetic and Non-Diabetic Patients with Dyspepsia
Mahshid Talebi-Taher,Manizheh Mashayekhi,Mohammad Hossein Hashemi,Vanosheh Bahrani
Acta Medica Iranica , 2012,
Abstract: Helicobacter pylori (H. pylori) is one of the most common chronic infections in patients with gastrointestinal disorders. Recent reports suggested that H. pylori might have high prevalence among patients with diabetes. The aim of this cross-sectional study was to assess the prevalence of H. pylori infection in diabetes mellitus and to study the relationship between histological findings and H. pylori infection in diabetic patients. Eighty patients with dyspepsia that were referred to our gastrointestinal department between May 2007 and May 2008 were included in our study. We checked fasting blood sugar for all of the study samples. All of patients underwent upper endoscopy and biopsy specimens were obtained from the antrum and the corpus. The specimens for the presence of H. pylori were colored by Giemsa stains. A single pathologist evaluated the histology slides. We found that prevalence of H. pylori infection was significantly higher in diabetics than in non-diabetics (P=0.001). Indeed, the prevalence of gastritis did differ significantly between the two groups (P=0.001). According to our results diabetes mellitus is one of the risk factor that must be considered in evaluation of H. pylori infection in diabetic patients with dyspepsia.
Effectiveness of Serum Ferritin in the Diagnosis of Preterm Labor
Talebi Sh.,Movahedi M,Talebi A
Qom University of Medical Sciences Journal , 2012,
Abstract: implicated in the cause of approximately two thirds of neonatal deaths. Some studies have shown that a positive relationship exists between inflammatory factors such as Ferritin, G-CSF, and IL6 and occurrence of preterm birth. The present study is done to estimate Serum ferritin for the prediction of preterm birth and determination of sensitivity and specificity of ferritin in diagnosis of preterm birth.Methods: This is a cross-sectional study conducted in Alzahra & Beheshti Hospitals, Esfahan, Iran during 2008-2009. All of the pregnant women who have the included criteria were investigated. 69 preterm and 153 term labors were studied. During the pregnancy, the level of serum ferritin was measured. The data was entered into a computer and analyzed by SPSS soft ware after collection. The T student, Chi square and Roc Curve tests were used for data analysis. Results: According to results of our study, sensitivity, specificity, positive and negative predictive values for diagnose of preterm labor at cut of point 22.5ng/ml were estimated as 78.3%, 83%, 67.5% and 89.4% respectively.Conclusion: Results show that there is a relationship between serum ferritin and preterm deliveries and according to sensitivity, specifity, positive and negative predictive value of serum ferritin, we can use this test for prediction of preterm birth.
Heritability estimates and correlations between production and reproductive traits in Lori-Bakhtiari sheep in Iran
M Vatankhah, MA Talebi
South African Journal of Animal Science , 2008,
Abstract: Heritablities and correlations were estimated between lamb body weight at different ages and reproductive traits in the Lori-Bakhtiari sheep breed. Data and pedigree information for Lori-Bakhtiari sheep used in this study were 5826 records of body weight of lambs from 240 sires and 1627 dams, and 5741 records of reproductive traits from 1797 ewes collected from 1989 to 2006 from a Lori-Bakhtiari flock at the Shooli station in Shahrekord. The lamb traits investigated were weights at birth (BWT), weaning (WWT) and at six months of age (WT6). The reproductive traits were conception rate (CR), litter size at birth per ewe lambing (LSB/EL), litter size at weaning per ewe lambing (LSW/EL), litter size at birth per ewe exposed to a ram (LSB/EE), litter size at weaning per ewe exposed (LSW/EE), total litter weight at birth per ewe lambing (TLWB/EL), total litter weight at weaning per ewe lambing (TLWW/EL), total litter weight at birth per ewe exposed (TLWB/EE) and total litter weight at weaning per ewe exposed (TLWW/EE). (Co)Variance components and genetic parameters were estimated using the restricted maximum likelihood procedure applying three multi-trait animal models. The estimates of direct heritability for lamb body weights were 0.31 ± 0.02 at birth, 0.10 ± 0.02 at weaning and 0.19 ± 0.02 at six months of age, and estimates of maternal heritability were 0.22 ± 0.02, 0.16 ± 0.02 and 0.04 ± 0.02, respectively. The estimates of heritability for reproductive traits varied from 0.02 ± 0.01 for CR to 0.23 ± 0.01 for TLWB/EL, and repeatability estimates for reproductive traits ranged from 0.11 for CR to 0.28 for LSB. Genetic correlations among lamb body weight and various reproductive traits were positive and varied from 0.06 to 0.98. Phenotypic correlations were lower than genetic correlations (0.01 to 0.20). The estimates of genetic correlations between lamb body weight with CR and litter size at birth and at weaning were low to moderate, while those between lamb body weight with TLBW and TLWW per ewe lambing and per ewe exposed were positive and very high. Thus, lamb body weight at weaning or at six months of age could be considered as selection criteria to indirectly improve reproductive traits in Lori-Bakhtiari sheep because the heritability of lamb body weight was more than that of reproductive traits and can be measured at an early stage in the life of the animal.
Uncoupled Learning Rules for Seeking Equilibria in Repeated Plays: An Overview
M. Sadegh Talebi
Computer Science , 2013,
Abstract: In this note, we consider repeated play of a finite game using learning rules whose period-by-period behavior probabilities or empirical distributions converge to some notion of equilibria of the stage game. Our primary focus is on uncoupled and completely uncoupled learning rules. While the former relies on players being aware of only their own payoff functions and able to monitor the action taken by the others, the latter assumes that players only know their own past realized payoffs. We highlight the border between possible and impossible results using these rules. We also overview several uncoupled and completely uncoupled learning rules, most of which leverage notions of regret as the solution concept to seek payoff-improving action profiles.
Atomic force microscopy and tridimensional topography analysis of human enamel after resinous infiltration and storage in water
Nadia M. Taher
Saudi Medical Journal , 2013,
Abstract: Objectives: To evaluate the effect of water storage on surface roughness (Ra) of human enamel after treatment with resin infiltrant and fissure sealant, by utilizing atomic force microscopy (AFM) and microtomography. Methods: This study was conducted after registration and ethical approval clarification at the College of Dentistry Research Center, King Saud University, Riyadh, Kingdom of Saudi Arabia between January 2011 and August 2011. Thirty enamel surface specimens were prepared from caries-free human premolar teeth. Specimens were divided into 3 groups: Group I, was the control; Group II, a resin infiltrant (Icon ) was applied on the enamel surfaces; and Group III, the teeth were treated with fissure sealant (SealRite ). All specimens were stored in distilled water for 6 months and then, subjected to AFM Veeco CP11 1.2 analysis. A few specimens were scanned by skyscan-1072-x-ray microtomography. The Ra mean readings were recorded and statistical analysis was performed with the Statistical Package for Social Sciences Version 16 at the significance level of p<0.05. Results: No significant differences in the mean Ra were recorded among the 3 groups, (Group I = 0.21±0.057), (Group II = 0.23±0.075), and (Group III = 0.20±0.039) at p=0.747. The AFM images of enamel surface show thin and inhomogeneous Icon resin in Group II, meanwhile, the SealRite in Group III showed a homogeneous layer in all specimens. The microtomography supported the findings of the AFM images. Conclusion: The persistence of the SealRite in all specimens revealed its low solubility in water and its protective effect on enamel surface.
Application of Homotopy Perturbation Method and Parameter Expanding Method to Fractional Van der Pol Damped Nonlinear Oscillator  [PDF]
Taher A. Nofal, Gamal M. Ismail, Sayed Abdel-Khalek
Journal of Modern Physics (JMP) , 2013, DOI: 10.4236/jmp.2013.411179
Abstract:

In this study, homotopy perturbation method and parameter expanding method are applied to the motion equations of two nonlinear oscillators. Our results show that both the (HPM) and (PEM) yield the same results for the nonlinear problems. In comparison with the exact solution, the results show that these methods are very convenient for solving nonlinear equations and also can be used for strong nonlinear oscillators.

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