The carbon nanotubes(CNTs) was described according to condensed-phase optimized molecular potentials and arranged to represent coal structures, while interaction of CNTs with gas components of the system involves the Van der Waals force. Thus, we are able to study the interaction ability between coal and gas in different cases through the binding energy calculated by molecular dynamic method. We find that when there was not liquid water, the adsorption capacity of coal bed methane gases on the surface of CNTs, in the order of magnitude, was CO2>CH4>N2, and when there existed liquid water, the order of the adsorption capacity of gases changed into the order of N2>CH4>CO2>H2O. When there existed liquid water, the surface of CNTs may first absorb a very thin layer of methane molecules, and then a layer of water group, forming a layer of water film or water drops, providing large quantity of adsorption potential for the residual gases.
Endothelial cells (EC), which line the internal surface of blood vessels, play various essential roles in controlling vascular function. The mouse is an important animal model for the study of vascular biology and cardiovascular diseases. However, the isolation of primary EC from the murine aorta is challenging because they are readily contaminated by smooth muscle cells (SMC). A previous study developed a simple method to isolate murine EC from SMC. By taking advantage of the differential sedimentation rate between the two cells, the EC was selectively enriched with collagen-coated polystyrene surfaces. Our study further improved this method by introducing a biomimetic peptide REDV (Arg-Glu-Asp-Val), which may bind specifically to EC but not to SMC or fibroblasts. Firstly, REDV-gelatin conjugate was synthesized by using the amine-to-sulfhydryl crosslinker SMCC. REDV-gelatin coating was then prepared on polystyrene surfaces, and their affinities to EC and SMC were subsequently investigated. Fluorescence microscopy and flow cytometric analysis showed that EC adhesion to the gelatin coating was significantly promoted by REDV peptide conjugation. Moreover, cell migration assay and cell viability assay also showed that the conjugation of REDV does not affect EC migration, and this coating did not show cytotoxicity against EC. This gelatin-REDV coating provides a cost-effective and straightforward tool for isolating EC from SMC, which may facilitate in vitro investigations of EC from mice.
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