Unprecedented POSS-linked 3D Covalent Organic Frameworks with scu or sqc Topology Regulated by Porphyrin Center for Photocatalytic CO2 Reduction.

The synthesis and characterization of porphyrin center regulated three-dimensional covalent organic frameworks with 2-fold interpenetrated scu or sqc topology have been investigated. These COFs exhibit unique structural features and properties, making them promising candidates for photocatalytic applications in CO2 reduction and artemisinin synthesis. The porphyrin center serves as an anchor for metal ions, allowing precise control over structures and functions of the frameworks. Furthermore, the metal coordination within the framework imparts desirable catalytic properties, enabling their potential use in photocatalytic reactions. Overall, these porphyrin center regulated metal-controlled COFs offer exciting opportunities for the development of advanced materials with tailored functionalities.

The comparative study of lumbar disc disruption with MRI and CT discography / 中华放射学杂志

Objective To compare MRI wi th CT discography (CTD) for diagnostic assessment of lumbar disc disruption. Methods Paired comparative examination in 16 patients with ch ronic lower back pain without radicular pain and no disc herniation was conducte d using CT or MRI. The standard of CTD classification and positive disc was for mulated and the correlation between the induced lower back pain and dosage used in CTD was observed. Results For a total of 21 discs in the 16 patients, CTD showed the disc as type 2 in 12 discs and type 5 in 1 disc with 13 positive discs, while MRI only showed the high-intensity zone of poster ior annulus in 6 discs as the indirect sign of disc disruption and disc degenera tion in 7 discs. Conclusion CTD was the only method for showing the direct sign of disc disruption. The induced lower back pain was rel ated with the type of disc disruption. MRI can show some of the indirect signs of disc disruption and CTD can show the direct sign of disc disruption.