در هنگام جستجو کلمه در قسمت عنوان میتوانید کلمات مورد جستجو را با کاراکتر (-) جدا کنید.
کاربرد نوع شرط:
- جایگاه : پژوهشی
- مجله: Iranian Journal of Chemistry and Chemical Engineering
- نوع مقاله: Journal Article
- کلمات کلیدی: Pressure drop,Twisted tape,Gas-solid fluidization,Fluctuation and expansion Ratios
- چکیده:
- چکیده انگلیسی: In the present work an attempt has been made to study the effect of the twisted tapes as bed internals, on the performance of the gas-solid fluidized beds. Experimental investigation has been carried out in cylindrical column with and without twisted tapes. Twelve numbers of twisted tapes of three different widths with four values of the twist ratios for each width were studied at different static bed heights. Twist ratio (y) is the ratio of axial distance for 1800 rotation of the tape (H) and the width (W) of the twisted tape. By using twisted tape the change in pressure drop, fluctuation ratio and expansion ratio have been studied as compared to “without twisted tape”. Incorporation of twisted tapes as baffle decreases the fluctuation ratio and expansion ratio thereby improving the fluidization quality as compared to the “without twisted tape”. However the increase in pressure drop due to presence of twisted tape is only marginal and of the order of, 5.25 to 14.9 percent over that of without twisted tapes. The maximum decrease in fluctuation ratio (r) for the tapes of various twist ratio has been found to be 11.6 to 20.5 percent based on the case of “without twisted tape”, thereby indicating a corresponding improvement in the quality of fluidization with reduced degree of bubbling and slugging. Quantitatively the maximum decrease in R for the twisted tapes of various twist ratios has been found to be 17 to 23 percent based on the case of “without twisted tapes”. However, the pressure drop, fluctuation and expansion ratio were in general found to decrease with decrease in twist ratio of a twisted tape. Different correlations have been developed for pressure drop, fluctuation ratio and expansion ratio and compared with their corresponding experimental values.
- انتشار مقاله: 07-07-1387
- نویسندگان: Saroj Kumar Padhi,Raghubansha Kumar Singh,Satish Kumar Agrawal
- مشاهده
- جایگاه : پژوهشی
- مجله: Asian Pacific Journal of Cancer Prevention
- نوع مقاله: Journal Article
- کلمات کلیدی: Apoptosis,Breast cancer,Neem Seed Oil,reactive oxygen species,Cell cycle
- چکیده:
- چکیده انگلیسی:
Background: In traditional Indian medicine, azadirachta indica (neem) is known for its wide range of medicinal properties. Various parts of neem tree including its fruit, seed, bark, leaves, and root have been shown to possess antiseptic, antiviral, antipyretic, anti-inflammatory, antiulcer, antimalarial, antifungal and anticancer activity. Materials and Methods: MCF-7 and MDA MB-231 cells were exposed to various concentrations of 2% ethanolic solution of NSO (1-30 μl/ml) and further processed for cell viability, cell cycle and apoptosis analysis. In addition, cells were analyzed for alteration in Mitochondrial Membrane Potential (MMP) and generation of Reactive Oxygen Species (ROS) using JC-1 and DCFDA staining respectively. Results: NSO give 50% inhibition at 10 μl/ml and 20 μl/ml concentration in MCF-7 and MDA MB-231 cells respectively and, arrests cells at G0/G1 phase in both the cell types. There was a significant alteration in mitochondrial membrane potential that leads to the generation of ROS and induction of apoptosis in NSO treated MCF-7 and MDA MB-231 cells. Conclusion: The results showed that NSO inhibits the growth of human breast cancer cells via induction of apoptosis and G1 phase arrest. Collectively these results suggest that NSO could potentially be used in the management of breast cancer.- انتشار مقاله: 06-01-1396
- نویسندگان: Ramesh Sharma,Shweta Kaushik,Hari Shyam,Satish Agrawal,Anil Kumar Balapure
- مشاهده