Broad flattened bandwidth wavelength conversion based on difference-frequency generation in aperiodically poled lithium niobate
APOC 2002: ASIA-PACIFIC OPTICAL AND WIRELESS COMMUNICATIONS, OPTIAL FIBER AND PLANAR WAVEGUIDE TECHNOLOGY II
Authors: Song, YJ; Zhan, L; Ye, QH; Xia, YX
Abstract
We propose a general routine, Genetic-Simulated Annealing method (GSA) for the optimal design of quasi-phase matched (QPM) non-uniform grating. Here this method is applied to the design of the flat broadened wavelength conversion bandwidth of 40-mm aperiodically poled lithium niobate (APLN) based on difference-frequency generation (DFG). The flat conversion bandwidth of APLN is broadened from the original 65 nm in a 40-mm periodically poled lithium niobate (PPLN) to the pre-designated 130 nm in a 40-mm APLN, which conversion efficiency is 6.7 dB higher than that of 12.4-mm PPLN under the same conversion bandwidth.
An endothelial apelin-FGF link mediated by miR-424 and miR-503 is disrupted in pulmonary arterial hypertension
NATURE MEDICINE
Authors: Kim, Jongmin; Kang, Yujung; Kojima, Yoko; Lighthouse, Janet K.; Hu, Xiaoyue; Aldred, Micheala A.; McLean, Danielle L.; Park, Hyekyung; Comhair, Suzy A.; Greif, Daniel M.; Erzurum, Serpil C.; Chun, Hyung J.
Abstract
Pulmonary arterial hypertension (PAH) is characterized by vascular remodeling associated with obliteration of pulmonary arterioles and formation of plexiform lesions composed of hyperproliferative endothelial and vascular smooth-muscle cells. Here we describe a microRNA (miRNA)-dependent association between apelin (APLN) and fibroblast growth factor 2 (FGF2) signaling in pulmonary artery endothelial cells (PAECs). APLN deficiency in these cells led to increased expression of FGF2 and its receptor FGFR1 as a consequence of decreased expression of miR-424 and miR-503, which directly target FGF2 and FGFR1. miR-424 and miR-503 were downregulated in PAH, exerted antiproliferative effects in PAECs and inhibited the capacity of PAEC-conditioned medium to induce the proliferation of pulmonary artery smooth-muscle cells. Reconstitution of miR-424 and miR-503 in vivo ameliorated pulmonary hypertension in experimental models. These studies identify an APLN-dependent miRNA-FGF signaling axis needed for the maintenance of pulmonary vascular homeostasis.