Abstract
Background: Recent studies indicate that hyperoxia has a significant therapeutic effect in the acute ischemic injury. The role of intracellular kinases, including ERK, has been posed in the phenomenon of ischemic tolerance. In the present study, the effect of intermittent normobaric hyperoxia on the activity of ERK in the stroke model was studied
Material and Methods: This is an experimental study. Animals include 4 groups (sham, hyperoxia–sham, stroke and hyperoxia–stroke); each group consisted of 6 male Wistar rats in the weight range of 250 to 350 grams. Hyperoxia groups were exposed to 95% inspired oxygen for 4 h/day and 6 consecutive days. Oxygen concentration in the control groups was 21% (normoxia, room air). After 24h, the stroke group animals were subjected to 60 min of right middle cerebral artery occlusion (MCAO). After 24h reperfusion, neurological deficit scores (NDS) and ERK activity were assessed.
Results: 5 hours after MCAO, stroke groups showed a significant increase in ERK activity in the cortex (p <0.01) and subcortex (p <0.001). At the same time, hyperoxia significantly increased the activity of ERK in cortex compared to the normoxia group (p<0.05). In subcortex, hyperoxia had no significant effect on ERK activity. Twenty-four hours after MCAO, stroke groups showed a significant reduction in ERK activity in the cortex (p <0.001) and subcortex (p <0.05). 24hr after MCAO, The activity of ERK in the hyperoxia groups; in both cortex and subcortex areas was significantly higher than that of the normoxia groups (p<0.05). Also, hyperoxia caused a significant decrease in NDS (p=0.0220).
Conclusion: Increased levels of ERK activity in the hyperoxia groups can be used to protect the nervous system, but the presence of other malicious factors may have been more effective in some cases, so that hyperoxia alone hasn’t been able to prevent stroke progression.
 

Abstract
Background: Antibiotic resistance rates in E. coli are rapidly rising, especially with regard to fluoroquinolones. One of the mechanisms that lead to antibiotic resistance is efflux pumps. The aim of this study was phonotypic and genotypic analysis of efflux pump role in fluoroquinolones resistance of E. coli strains isolated from hospitalized patients in Kermanshah 2013.
Materials and Methods: In this cross-sectional study, 100 isolates of E. coli were collected from hospitalized patients from Kermanshah. All isolates were identified by standard biochemical tests. The antimicrobial susceptibility patterns were determined by disk diffusion method according to CLSI guidelines. The presence of Efflux pump genes was determined by a PCR method.
Results: The rates of resistance to Ceftazidime, Nalidixic Acid, Ciprofloxacin, Norfloxacin, Ofloxacin, Gentamicin, and Tetracycline were 73%, 67%, 55%, 54%, 45%, 38%, and 24%, respectively. According to the results of PCR test, of 100 E. coli isolates, 99% of isolates were positive for acrA, 98% for acrB, 95% for acrE, 98% for acrF, 94% for mdfA, 96% for norE, and 96% for tolC.
Conclusion: In Strains with positive gene acrA, acrB, acrA, acrB, tolC, mdfA, norE, the presence of efflux pump inhibitor reduced the amount of resistance to antibiotics. So, efflux pumps are important in antibiotic resistance.
 

Background and Aim: From the viewpoint of Iranian Traditional Medicine (ITM), hemorrhoidal bleeding is not only an organic disease; it also indicates the quality and quantity of blood and temperaments in the body. According to this view, bleeding from different areas has several causes, two important causes of which are: a. vascular hyperemia and consequent blooding in bleeding-prone areas, and b. changes in blood quality that cause the arteries to open and bleed. This study, by reporting a case of hemorrhoidal bleeding, is an evidence of some therapeutic principles in ITM.
Case Report: Patient was a 39-year-old married woman with four children and warm-wet temperament complaining of heavy menstrual bleeding for one year. After three months of herbal drug administration, menstrual bleeding became normal. One month later, she had hemorrhoidal bleeding. Her bleeding was treated based on ITM method by removing the black bile (Soda) from the body, phlebotomy and leech therapy around the anus.
Ethical Considerations: This study has been approved by the Research Ethics Committee of Arak University of Medical Sciences with code: IR.MUQ.REC.1396.110.
Conclusion: Based on ITM, it seems that the cause of hemorrhoidal bleeding in this case is vascular hyperemia and poor blood quality following symptomatic treatment of heavy menstrual bleeding.

Introduction: Helicobacter pylori is the most common bacterial infection in the world. Infection with this bacterium occurs during the first 5 years of life. The present study was conducted with the aim of investigating the frequency of Helicobacter pylori infection in children and the types of histopathological changes related to it in endoscopic gastric biopsy samples of children.
Methods: In this cross-sectional-descriptive study, the prevalence of Helicobacter pylori and histopathological findings of 169 children with it were examined in the gastric endoscopic biopsy samples that were sent to the pathology department of Shahid Motahari Hospital in Urmia during March 2019 to March 2022. This study was approved by Research Ethics committee of Urmia University of Medical Science, Urmia, Iran (code: IR.UMSU.REC.1400.227).
Results: Out of 571 examined patients, 169 children (29.5%) were infected with Helicobacter pylori, the most common histopathological lesion was chronic gastritis. 40.3% of patients had active chronic inflammation as a result of gastric biopsy. No significant relationship was found between Helicobacter pylori and children's gender (P=0.29), but a significant relationship was observed between Helicobacter pylori results and children's age (P=0.04). A significant relationship was also observed between Helicobacter pylori infection and the severity of chronic gastritis (P=0.0001).
Conclusions: Considering that the inflammatory histopathological changes of the stomach are seen in all children with Helicobacter pylori infection and in more than 40% of cases this inflammation is of an active type, it is necessary to pay special attention to the early diagnosis and treatment of this infection in children.