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- 저자 : Behrouz Raei (검색결과 2 건)
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Helicobacter pylori Infection and Dietary Factors Act Synergistically to Promote Gastric Cancer
Raei, Negin,Behrouz, Bahador,Zahri, Saber,Latifi-Navid, Saeid Asian Pacific Journal of Cancer Prevention 2016 Asian Pacific journal of cancer prevention Vol.17 No.3
However, the incidence of gastric cancer (GC) has been decreased in past decades; GC is the second cause of cancer related death in the world. Evidence has illustrated that several factors including Helicobacter pylori (H. pylori) infection, host genetics, and environmental factors (smoking and particularly diet) may play a crucial role in gastric carcinogenesis. It has been demonstrated that high consumption of fresh fruits, vegetables, high level of selenium and zinc in drinking water, sufficient iron, and cholesterol protect against GC, while; smoked, pickled, and preserved foods in salt, and nitrites increase the risk of GC. Epidemiological studies have also proved that H. pylori infection and a high salt diet could independently induce atrophic gastritis and intestinal metaplasia. Recently, studies have been demonstrated that dietary factors directly influence H. pylori virulence. The use of appropriate diet could reduce levels of H. pylori colonization or virulence and prevent or delay development of peptic ulcers or gastric carcinoma. This is attractive from a number of perspectives including those of cost, treatment tolerability, and cultural acceptability. This review will describe new insights into the pathogenesis of H. pylori in relation to environmental factors, especially dietary, not only to find the developed means for preventing and treating GC, but also for understanding the role of chronic inflammation in the development of other malignancies.
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Hamidreza Roozbahani,Sarah Maghsoodi,Behrouz Raei,Amirhossein Shahbazi Kootenaei,Zoha Azizi 한국화학공학회 2022 Korean Journal of Chemical Engineering Vol.39 No.3
La2MMnO6 (M=Co, Ni) dual perovskite oxides were synthesized by sol-gel and gel-combustion methods and tested for the total oxidation of propane. The synthesized catalysts were characterized by TPR, XRD, ICP, SEM, TEM, H2-TPR and O2-TPD techniques. The preparation method had a significant effect on the physicochemical properties of samples. The XRD spectra resulting from the synthesized samples revealed the formation of single-phase perovskite structure. The largest BET specific surface area related to the La2NiMnO6 perovskite synthesized by the gelcombustion method was obtained as 35m2g1 after calcination at 500 oC. Based on the findings, the catalysts synthesized by the gel-combustion method showed an increase in specific surface area, oxygen capacity, reducibility and oxygen mobility compared to those synthesized by the sol-gel method. Accordingly, these catalysts revealed a better performance. The acquired results also showed that the presence of Ni improved the catalytic activity compared to Co. The La2NiMnO6 perovskite synthesized by the gel-combustion method with the T90 equal to 415 oC was found to be the most active catalyst, while the La2CoMnO6 double perovskite synthesized by the sol-gel method with the T90 equal to 474 oC demonstrated the lowest activity.
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