Photodetectors integrating waveguides and semiconductor materials.

Photodetectors integrating substrates and semiconductor materials are increasingly attractive for applications in optical communication, optical sensing, optical computing, and military owing to the unique optoelectronic properties of semiconductor materials. However, it is still a challenge to realize high-performance photodetectors by only integrating substrates and semiconductor materials because of the limitation of incident light in contact with sensitive materials. In recent years, waveguides such as silicon (Si) and silicon nitride (SiN) have attracted extensive attention owing to their unique optical properties.

Three new secolignans from (Jacq.) Kunth.

Three new secolignans were found in the detailed chemical study of (Jacq.) Kunth collected from China. Detailed NMR data analysis, especially H NMR, C NMR and 2 D NMR, elucidates the structures of the three new secolignans.

Two isopentenyl resorcinols from .

Two isopentenyl resorcinols, peperobtusin B and peperobtusin C, have been isolated from . Their structures were determined on the basis of spectroscopic methods, especially H NMR, C NMR, 2D NMR, and HR-TOF-MS. Two compounds were evaluated for cytostatic activity against G, A 549, Hela and HCT 116 cells, but cytostatic activity of both compounds is weak.