Photoluminescence and magnetism integrated multifunctional black phosphorus probes through controllable PO bond orbital hybridization.

Biological probes with integrated photoluminescence and magnetism characteristics play a critical role in modern clinical diagnosis and surgical protocols combining fluorescence optical imaging (FOI) with magnetic resonance imaging (MRI) technology. However, traditional magnetic semiconductors can easily generate a spin splitting at the Fermi level and half-metallic electronic occupation, which will sharply reduce the radiation recombination efficiency of photogenerated carriers. To overcome this intrinsic contradiction, we propose a controllable oxidation strategy to introduce some particular PO bonds into black phosphorus nanosheets, in which the p orbital hybridization between P and O atoms not only provides some carrier recombination centers but also leads to a room-temperature spin polarization. As a result, the coexistence of photoluminescence and magnetism is realized in multifunctional black phosphorus probes with excellent biocompatibility. This work provides a new insight into integrating photoluminescence and magnetism together by intriguing atomic orbital hybridization.

Effect of six flavonoids on proliferation of hepatic stellate cells in vitro.

AIM: To study the effects of six flavonoids (fisetin, quercetin, apigenin, phloretin, hesperetin, and chalcone) on proliferation of hepatic stellate cell (HSC-T6 cells). METHODS: Cell proliferation was measured by crystal violet staining assay. RESULTS: Fisetin, quercetin, apigenin, phloretin, hesperetin, chalcone (6.25-50 mumol.L-1) inhibited the proliferation of HSC-T6 cells stimulated by serum, macrophage conditioned medium (MCM) and platelet-derived growth factor (PDGF) in a concentration-dependent manner. In the MCM-stimulated proliferation experiment, their IC50 were 21.48, 18.52, 19.75, 22.32, 30.32, and 30.85 mumol.L-1, respectively. In the PDGF-stimulated proliferation experiment, their IC50 were 9.47, 9.48, 9.25, 12.25, 25.22, and 30.40 mumol.L-1, respectively. CONCLUSION: The six flavonoids inhibited the proliferation of hepatic stellate cells.

[Comparative molecular field analysis (CoMFA) of allylamine antimycotics].

Active analog approach has been applied to determine the pharmacophoric conformations of the allylamine antimycotics. Comparative molecular field analysis (CoMFA) has been used to establish 3D-QSAR of 48 allylamine antimycotics against six common human pathogenic fungi. Two different alignment rules were compared in the meantime. Five new synthetic compounds have been successfully employed to examine the predictive abilities of the CoMFA models against Trichophyton mentagrophytes and Aspergillus fumigatus.