Publications by authors named "K K Oguri"
Symmetries essentially provide conservation rules in nonlinear light-matter interactions and facilitate control and understanding of photon conversion processes or electron dynamics. Since anisotropic solids have rich symmetries, they are strong candidates for controlling both optical micro- and macroscale structures, namely, spin angular momentum (circular polarization) and orbital angular momentum (spiral wavefront), respectively. Here, we show structured high-harmonic generation linked to the anisotropic symmetry of a solid.
View Article and Find Full Text PDFThe hadopelagic environment remains highly understudied due to the inherent difficulties in sampling at these depths. The use of sediment environmental DNA (eDNA) can overcome some of these restrictions as settled and preserved DNA represent an archive of the biological communities. We use sediment eDNA to assess changes in the community within one of the world's most productive open-ocean ecosystems: the Atacama Trench.
View Article and Find Full Text PDFAcoustically induced dressed states of long-lived erbium ions in a crystal are demonstrated. These states are formed by rapid modulation of two-level systems via strain induced by surface acoustic waves whose frequencies exceed the optical linewidth of the ion ensemble. Multiple sidebands and the reduction of their intensities appearing near the surface are evidence of a strong interaction between the acoustic waves and the ions.
View Article and Find Full Text PDFBackground: It is unclear witch regimen is optimal as salvage chemotherapy (SCT) after immune checkpoint inhibitor (ICI) monotherapy for recurrent or metastatic head and neck cancer (RM-HNC).
Methods: This study enrolled 109 patients. Overall survival (OS) and progression-free survival 2 (PFS2) were compared between patients stratified by SCT regimen.
Article Synopsis
- Understanding how microplastics behave in oceans is key to tackling marine plastic pollution, especially since the deep seafloor is a major accumulation area for them.
- A study in Sagami Bay revealed that the deepest parts of the ocean had a higher density of microplastics than previously seen, showing significant differences in the types and shapes of plastic found there compared to shallower areas.
- The research indicates that microplastics from the surface layer sink to the abyssal plains, while those from land sources settle in shallower depths and are moved deeper by underwater currents.