Yuefeng Liu

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This study aimed to determine the effect of andrographolide (AD) on the growth of H3255 lung cancer cells and its possible impact on the expression and activity of the matrix metalloproteinase (MMP)-9 protein. H3255 cells were cultured in vitro, and treated with AD (1, 5 or 10 µM) for 24, 48 or 72 h. Cell proliferation was detected using an MTT assay and(More)
Assemblies of nanoparticles are studied in many research fields from physics to medicine. However, as it is often difficult to produce mono-dispersed particles, investigating the key parameters enhancing their efficiency is blurred by wide size distributions. Indeed, near-field methods analyse a part of the sample that might not be representative of the(More)
— Dynamic navigation is the advanced level of navigation service. The construction for an efficient and effective navigation data model to meet the requirements of dynamic navigation is the key point of the study. It first introduces the system requirements of dynamic navigation for navigation data. Then it briefly discusses several current navigation data(More)
In china, there exists four problems to use common GIS (Geographical Information System) directly in GIST (Geographical Information Systems for Transportation). They are: security, real time property, distribution on-line and renovation, and too huge data to be transferred. In order to solve the secure problem, some fixed and coverable inner storage(More)
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