Showing 6 results for Goudarzi
Gh Goudarzi, P Msc of Microbiology, Department of Microbiology, School of Medicine, Lorestan University of Medical, M Lashkarara,
Volume 8, Issue 3 (Autumn[PERSIAN] 2014)
Abstract
Abstract Background and Objective: Escherichia coli, one of the most common causative agents of urinary tract infections (UTIs) acquired from community and hospital, has developed multiple resistances to various antibiotics such as aminoglycosides. The main resistance mechanism to aminoglycosides is inactivation of these drugs by a variety of acetyltransferase, nucleotidyltransferase, and phosphotransferase enzymes. this study aimed to assess the prevalence of resistance to some important aminoglycosides as well as the distribution of aph(3)-Ia, aac(3)-IIa and ant(2)-Ia genes among uropathogenic Escherichia coli isolates obtained from patients suffering UTIs. Material and Methods: Using the disk diffusion method, the antimicrobial susceptibility of 200 uropathogenic E. coli isolates collected from outpatients and inpatients was investigated to nine antibiotics. Then, the distribution of aac (3)-IIa, aph (3)-IA and ant (2)-IA genes was determined by PCR method. Results: Thirty-nine percent of E.coli isolates obtained from inpatients (n=100) and 19% of those from outpatient (n=100) demonstrated resistance to at least one of the tested aminoglycosides (i.e. 58 isolates). Among the isolates examined (n=200), 19.5%, 13%, 7.5% and 4.5% were resistant to gentamicin, kanamycin, neomycin and amikacin, respectively. The most prevalent gene among the strains resistance to at least one of the aminoglycosides (n=58) was aac (3)-IIa (65.5%), followed by aph (3)-IA (25.8%). Also, the ant (2)-IA gene was not seen in any isolates. Conclusion: The presence of aac (3)-IIa gene is significantly associated with gentamicin resistance (100%, p<0.05). Because of relatively high distribution of the aac (3)-IIa gene among uropathogenic E.coli, the use of aminoglycosides such as amikacin to treat UTI in clinical setting is recommended. Keywords: Escherichia Coli, Urinary Tract Infections, Aminoglycoside-Modifying Enzymes (AMEs)
Hesam Alizade , Fatemeh Fallah , Reza Ghanbarpour , Hosein Goudarzi , Hamid Sharifi , Mohammad Reza Aflatoonian ,
Volume 10, Issue 2 (Mar,Apr2016 2016)
Abstract
ABSTRACT
Background and Objective: One of the main tasks of clinical microbiology laboratories is to determine antibiotic resistance profiles in common pathogens and ensure the selection of effective antibiotics for certain infections. The aim of this study was to compare the methods of disk diffusion, broth microdilution and modified Hodge test in Escherichia coli isolates from urinary tract infection and diarrhea for susceptibility testing against beta-lactam antibiotics in Kerman, Iran.
Methods: In this study, 432 E. coli isolates were collected from diarrhea (216 isolates) and urinary tract infection samples (216 isolates). The antibiotic susceptibility testing methods of disk diffusion, broth microdilution and modified Hodge test were performed according to the Clinical and Laboratory Standards Institute guidelines.
Results: The findings of disk diffusion method showed that resistance to cefotaxime, ceftazidime, aztreonam, cefepime and imipenem was 51.15%, 30.55%, 24.30%, 15.27% and 1.85%, respectively. In the disk diffusion test, 51.15% of the isolates were resistant to at least one antibiotic, all of which were later evaluated by the broth microdilution method. Moreover, 52.94%, 17.19%, 13.12% and 0.90% of the isolates were resistant to cefotaxime, ceftazidime, cefepime and imipenem, respectively. All of the isolates were evaluated for the production of carbapenemase enzyme by the modified Hodge test and none of the isolates were found as positive.
Conclusion: This study shows that performing carbapenem tests is very challenging, and laboratories are recommended to use secondary and independent antibiotic susceptibility tests such as modified Hodge test to confirm the carbapenem-resistant results.
Leila Goudarzi, Rouha Kasra Kermanshahi, Zahra Moosavi-Nejad,
Volume 10, Issue 2 (Mar,Apr2016 2016)
Abstract
ABSTRACT
Background and Objective: Lactic acid bacteria are Gram-positive, catalase-negative, nonsporulating, either rod- or coccus-shaped bacteria that have beneficial effects on their hosts by producing antimicrobial substances such as lactic acid, hydrogen peroxide, bacteriocins and biosurfactants. Bacteriocins are antimicrobial peptides that are produced by bacteria and can inhibit the growth of other bacteria.
Methods: In this experimental study, bacteriocin production by Lactobacilli as known probiotic strains was evaluated in different physicochemical conditions. Antagonistic activity was evaluated using quantitative method of Microscale Optical Density Assay (MODA). After neutralization of acid and treatment with various enzymes, temperature, pH and NaCl conditions, the antimicrobial activity of culture supernatant fluid of Lactobacillus acidophilus and L. plantarum was investigated against pathogenic Proteus.
Results: The culture supernatant fluid of Lactobacilli was sensitive to proteolytic enzymes with relatively good stability to temperature. The antimicrobial activity was also present due to production of bacteriocin under different NaCl conditions (1 to 4% NaCl) and pH range of 5 to 8.
Conclusion: It seems that the antimicrobial liquid of Lactobacillus strains contains bacteriocin, which shows antimicrobial effects against pathogenic strains of Proteus. To investigate further this effect, some complementary studies should be performed.
Taiebeh Tamoradi, Hamid Goudarziafshar , Somayeh Rashki , Fatemeh Katouzian, Firoozeh Chalabian,
Volume 11, Issue 2 (Mar-Apr 2017)
Abstract
ABSTRACT
Background and objectives: Synthesis and characterization of several metal complexes (metal ions: Co2+, Ti4+ and Ce3+) of macroacyclic Schiff base ligand have been reported. The Schiff base ligand is prepared from the condensation reaction of 1, 4-di-(4-fluoro-2-aminophenoxy) butane with salicylaldehyde in ethanol. In addition, antibacterial activity of metal ions, Schiff base ligand and their complexes have been investigated. Recent studies show that many Schiff base complexes have antibacterial activity against Gram-positive and Gram-negative bacteria. Therefore, we aimed to synthesize new Schiff base complexes and evaluate their antibacterial activity against a number of Gram-positive and Gram-negative bacteria.
Methods: Schiff base ligand and their complexes were characterized by mass spectrometry and IR, H-NMR and C-NMR spectroscopy. The in vitro antibacterial activity of the Schiff base ligand, metal ions and their complexes were evaluated against some Gram-positive and Gram-negative bacteria by disk diffusion method and determining minimum inhibitory concentration.
Results: In this study, the Schiff base complexes had good antibacterial activity, but the Schiff base ligand and metal ions did not show any antibacterial effect. In some cases, the antibacterial effect of the complexes was higher than that of the standard antibiotics tetracycline and gentamycin. The titanium complex showed the highest antibacterial activity in both methods. This complex created the largest growth inhibition zone (diameter: 100mm) against Staphylococcus aureus, and had the lowest minimum inhibitory concentration against Bacillus subtilis (6.75 mg/ml).
Conclusion: The compounds synthesized in our study have strong antibacterial activity.
Keywords: Schiff base complex, Schiff base ligand, antibacterial activity, Staphylococcus aureus, Bacillus subtilis.
Behrouz Farhadihosseinabadi , Fahimeh Hosseini , Pegah Larki , Nader Bagheri , Kazem Abbaszadeh-Goudarzi , Koushan Sinehsepehr , Behrooz Johari , Meghdad Abdollahpour-Alitappeh ,
Volume 12, Issue 5 (Sep-Oct 2018)
Abstract
ABSTRACT
Breast cancer remains the most common cancer of women and one of the most common causes of cancer-related deaths worldwide. In spite of major advances in breast cancer diagnosis and treatment, the incidence of breast cancer remains high and the treatment of metastatic breast cancer remains challenging. This review presents an overview of breast cancer with a particular focus on its clinical aspects and therapies.
Keywords: Breast Cancer, Risk Factors, Diagnosis, Treatment.
Mohsen Mousavi , Behrooz Johari , Jamil Zargan , Ashkan Haji Noor Mohammadi , Hamid Reza Goudarzi , Saeed Dezianian , Hani Keshavarz Alikhani ,
Volume 13, Issue 3 (May-Jun 2019)
Abstract
ABSTRACT
Background and Objectives: Nowadays, infections with antibiotic-resistant bacteria are among the most important causes of mortality worldwide. This has attracted the attention of researchers to seek suitable alternatives for antibiotics. The venom of many toxic species such as arthropods has antibacterial properties. In this study, we investigated antibacterial effects of crude venom of Latrodectus dahli on Escherichia coli, Staphylococcus aureus, and Bacillus subtilis.
Methods: Lyophilized crude venom of L. dahli was dissolved in 50 mM Tris-HCl buffer. Protein concentration was determined by the Bradford assay. Then, the bacteria were exposed to different concentrations (31.25-250 ng/mL) of the crude venom. Inhibitory activity of the venom against the bacteria was determined by MTT assay and determining minimum inhibitory concentration (MIC).
Results: Results of the MTT assay showed that the crude venom significantly inhibited the growth of E. coli (31.25 and 62.5 ng/mL), S. aureus (at 250 ng/mL) and B. subtilis (at 125 and 250 ng/mL). In the MIC experiment, the crude venom significantly inhibited the growth of E. coli (at concentrations of 31.25 and 62.5ng/mL), S. aureus (at concentrations of 31.25-250 ng/mL) and B. subtilis (at concentrations of 31.25-250ng/mL).
Conclusion: The crude venom of L. dahli and its components showed relatively strong antibacterial effects.
Keywords: Spider venoms, Black Widow Spider, Antibacterial agent, Drug-resistance.
