In this update meta-analysis of observational studies, PPI use modestly increased the risk of hip, spine, and any-site fracture, but no evidence of duration effect in subgroup analysis.
Ultralow-frequency (ULF) Raman spectroscopy becomes increasingly important in the area of two-dimensional (2D) layered materials; however, such measurement usually requires expensive and nonstandard equipment. Here, the measurement of ULF Raman signal down to 10 cm(-1) has been realized with high throughput by combining a kind of longpass edge filters with a single monochromator, which are verified by the Raman spectrum of L-cystine using three laser excitations. Fine adjustment of the angle of incident laser beam from normal of the longpass edge filters and selection of polarization geometry are demonstrated how to probe ULF Raman signal with high signal-to-noise. Davydov splitting of the shear mode in twisted (2+2) layer graphenes (t(2+2)LG) has been observed by such system in both exfoliated and transferred samples. We provide a direct evidence of twist-angle dependent softening of the shear coupling in t(2+2)LG, while the layer-breathing coupling at twisted interfaces is found to be almost identical to that in bulk graphite. This suggests that the exfoliation and transferring techniques are enough good to make a good 2D heterostructures to demonstrate potential device application. This Raman system will be potentially applied to the research field of ULF Raman spectroscopy.
Key indicators: single-crystal X-ray study; T = 293 K; mean (C-C) = 0.004 Å; R factor = 0.060; wR factor = 0.158; data-to-parameter ratio = 14.0.In the title compound, C 6 H 7 N 3 O, there are inter-and intramolecular N-HÁ Á ÁN hydrogen bonds and an O-HÁ Á ÁN hydrogen bond.
Related literatureFor related literature, see: Gezginci et al. (2001). Experimental Crystal data C 6 H 7 N 3 O M r = 137.15 Monoclinic, P2 1 =c a = 5.5220 (11) Å b = 12.365 (3) Å c = 9.797 (2) Å = 94.38 (3) V = 667.0 (3) Å 3 Z = 4Mo K radiation = 0.10 mm À1
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