Showing 4 results for Vaez
Mahmoud Alebouyeh , Zahra Abedi , Hossein Rastegar , Hasan Bagheri , Javad Vaez, Behrouz Akbari-Adergani ,
Volume 9, Issue 5 (Nov,Dec-2015 2015)
Abstract
Abstract
Background and Objective: Aluminum salts are among the most common useful additive compounds in preparation of human and animal vaccines. Aluminum phosphate and aluminum hydroxide are two additives that show good immunoadjuvant effects with many antigens. Aluminum-containing vaccines lead to a better and longer immune response compared to adjuvant-lacking vaccines. The Chromogenic methods used for determination of aluminum amounts in manufacturing centers are time-consuming and requires some experienced technicians to obtain accurate results. This study aimed to design and validate a simple polarographic method to measure aluminum in recombinant hepatitis B vaccine.
Methods: In this study, the effects of temperature, pH, potential range and potential scan rate on the polarographic method of measuring aluminum in hepatitis B vaccine was evaluated and the optimal values for each of these factors were achieved.
Results: In order to measure aluminum, temperature of 60 °C and pH of 4.5 were found as the optimal values. Implementation of polarographic method in the potential range of -0.25 to 0.1 volts had a better signal.
Conclusion: Since the polarography method is more simple, accurate and faster than the chromogenic methods, it is suitable to be used for the measurement of aluminum in hepatitis B vaccine and it is recommended to be used in quality control laboratories for biological products.
Keywords: Adjuvant, Hepatitis B Vaccine, Polarography, Aluminum.
Hamid Vaez , Vahid Vaez , Farzad Khademi ,
Volume 11, Issue 6 (Nov - Dec 2017)
Abstract
ABSTRACT
Background and Objectives: Pseudomonas aeruginosa is an important non-fermenting gram-negative hospital-acquired pathogen. Treatment of P. aeruginosa infections has become more challenging due to overexpression of efflux pumps. The aim of the present study was to apply in silico analysis to evaluate the structure of the efflux pump regulatory protein, MexR, and impact of mutation on its stability and function.
Methods: Different bioinformatics tools including EXPASY, PROTEER, TECCOFFE, iStable, I-Mutant 2, STRING, ESPript, GOR IV, and PDB were used in the study.
Results: Aliphatic and instability indices were 104.15, and 46.52, respectively, indicating that the protein has a relatively short half-life. Most mutations decreased protein stability. Twenty-four mutations were identified as deleterious, with negative impact on the protein’s function.
Conclusion: Determination of structure, variability, and function of MexR could be useful for modeling of treatment and control of multidrug resistant P. aeruginosa, with overexpressed efflux pump. We found that MexR is a relatively unstable and conserved protein and the majority of mutations decrease its stability.
Keywords: Pseudomonas aeruginosa, MexR protein, Drug resistance, drug resistance multiple.
Ali Vaez, Hadi Razavi Niko, Seyyede Delafruz Hosseini, Elham Mobasheri, Alijan Tabarraei,
Volume 17, Issue 5 (Sep-Oct 2023)
Abstract
Background: The hepatitis B virus (HBV) is a major public health problem worldwide. Vertical and horizontal transmission of HBV could affect neonates and partners. This transmission can vary in populations. Also, high-risk behaviors and clinical records affect the transmission of this virus. Due to the lack of information on vaginal discharge related to HBV in the north of Iran, we aimed to assess the presence of HBV in pregnant women's vaginal secretion referred to Sayyad Shirazi Hospital in Gorgan City, north of Iran.
Methods: This cross-sectional study was performed on 315 cervicovaginal lavages from pregnant women. Viral DNA was extracted, and the gene fragments of the virus were checked by polymerase chain reaction (PCR). Clinical, demographic, and behavioral data were entered into SPSS version 16. The chi-square tests were used to determine any association between categorical data.
Results: Hepatitis B virus DNA was detected in 2.2% (7/315) of samples. The age range of patients was from 14 to 43 years. Anal sex (P = 0.043) and not using a condom (P = 0.047) were significantly associated with HBV-positive cases. Abortion, unusual discharge, and some other clinical and demographic information showed no related statistical correlation.
Conclusion: The results showed a similar rate of infection in the general Iranian population. In pregnant women, the risk of HBV transmission and chronic HBV can be critical in newborns; therefore, it is strongly recommended to conduct screening and provide management for women during pregnancy.
Fatemeh Rashedi, Zahra Yazdanpour, Farzad Khademi, Hamid Vaez,
Volume 17, Issue 6 (Nov-Dec 2023)
Abstract
Background: Urinary tract infection (UTI) is one of the most prevalent bacterial diseases worldwide. Escherichia coli is a well-known etiological agent of UTI. The emergence and spread of metallo-beta-lactamase (MBL)-producing E. coli is a serious threat to public health.
This study aimed to investigate the antibiotic resistance pattern and prevalence of MBL-producing E. coli isolated from UTI.
Methods: From January 2020 to June 2021, 1200 urine specimens were collected from patients suspected of having UTI. Antibiotic susceptibility testing was carried out by the disk diffusion method. The prevalence of MBL (blaVIM, blaIMP, blaSPM, and blaNDM) genes was determined by the polymerase chain reaction (PCR) method.
Results: The highest susceptibility was observed against amikacin (96%) and gentamicin (95%). The isolates were mostly resistant against ampicillin (72%) and cephalothin (60%). All carbapenem-resistant isolates were MBL-positive. Based on the results of PCR, 75% of the isolates were blaNDM-positive.
Conclusion: Resistance to some antibiotics, such as ampicillin and cephalothin, was high, and their prescription must be restricted. The prevalence of MBL-producing isolates was not high; however, due to the high level of resistance against other antibiotics, continuous monitoring of MBL-producing isolates is highly essential.
