The molecular imprinting polymeric microspheres (MIPs) of stignmasterol was synthesized by suspension polymerization, utilizing stignmasterol (stig.) as template molecule, methyl methacrylate (MMA) as functional monom...
详细信息
The molecular imprinting polymeric microspheres (MIPs) of stignmasterol was synthesized by suspension polymerization, utilizing stignmasterol (stig.) as template molecule, methyl methacrylate (MMA) as functional monomer, divinyl benzene (DVB) as cross-linker agent, CaCO3 and SDS as dispersant, Na2S2O8 as initiator and lowpolar solvents (toluene) as porogenic solvents. The morphology, averages size and selectivity for stignmasterol of the synthesized polymers were respectively examined and evaluated by HPLC, SEM and Photon Correlation Spectroscopy. The experiment results showed that the optimal condition was 3g stig.:40 mL MMA:15 mL DVB:4g CaCo3 + 2g SDS:14 mL tolu.. During polymerization initiator Na2S2o8 should be added in more batches and in the early period a high speed string was applied, with the polymerization the string rate was reduced. The prepared MIPs, which average diameters were below 100 μm and narrow size distribution, could effectively separate stignmasterol from structural analogues β-stiosterol with above 1.65 separate factor and about 1.2 mg/g adsorptive capacity for stigmasterol.
The single charged top-pion production processes e~+ e~- → tbΠ_t~- and e~+e~- → W~+Π_t~- are studied in the framework of top-color-assisted technicolor (TC2) model. Ourstudies show that the cross section σ(e~+ e...
详细信息
The single charged top-pion production processes e~+ e~- → tbΠ_t~- and e~+e~- → W~+Π_t~- are studied in the framework of top-color-assisted technicolor (TC2) model. Ourstudies show that the cross section σ(e~+ e~- → tbΠ_t~-) Teaches the level of tens of fb andσ(e~+ e~- → W~+Π_t~-) reaches the level of a few fb. With the yearly integrated luminosity of ￡～ 500 fb~(-1) expected at the planned colliders, one could collect thousands of charged top-pion ofevents via the process e~+ e~- → tbΠ_t~- and hundreds of events via the process e~+ e~- →W~+Π_t~-. The flavor changing decay mode Π_t~- → bc is the best channel to detect chargedtop-pion due to the clean SM background. With a large number of events and the clean background, thecharged top-pion should be observable at the planned colliders. Therefore, our studies in thispaper can help us to search for charged top-pion, and furthermore, to test the TC2 model.
暂无评论