3 research outputs found
Topological interfacial states in ferroelectric domain walls of two-dimensional bismuth
Using machine learning method, we investigate various domain walls for the
recently discovered single-element ferroelectrics bismuth monolayer [Nature
617, 67 (2023)]. Surprisingly, we find that the charged domain wall
configuration has a lower energy than the uncharged domain wall structure due
to its low electrostatic repulsion potential. Two stable charged domain wall
configurations exhibit topological interfacial states near their domain walls,
which is caused by the change of the Z_2 number between ferroelectric and
paraelectric states. Interestingly, different from the edge states of
topological insulators, the topological interfacial states related Dirac bands
are contributed from different edges which is caused by the build-in electric
field of FE. Our works thus indicate that domain walls in two-dimensional
bismuth can be a good platform for ferroelectric domain wall devices.Comment: 15 pages, 4 fig
Dramatic red fluorescence enhancement and emission red shift of carbon dots following Zn/ZnO decoration
Dramatic red fluorescence enhancement and emission red shift of carbon dots following Zn/ZnO decoratio
Cell Signaling Pathway in 12-O-Tetradecanoylphorbol-13-acetate-Induced LCN2 Gene Transcription in Esophageal Squamous Cell Carcinoma
LCN2 is involved in various cellular functions, including transport of small hydrophobic molecules, protection of MMP9 from proteolytic degradation, and regulating innate immunity. LCN2 is elevated in multiple human cancers, frequently being associated with tumor size, stage, and invasiveness. Our previous studies have shown that LCN2 expression could be induced by 12-O-tetradecanoylphorbol-13-acetate (TPA) in esophageal squamous cell carcinoma (ESCC) by the binding of five nucleoproteins (MISP, KLF10, KLF15, PPP1R18, and RXRβ) at a novel TPA-responsive element (TRE), at −152~−60 bp of the 5′ flanking region of the LCN2 promoter. However, much is unknown about whether these proteins can respond to TPA stimulation to regulate LCN2 transactivation and which cell signaling pathways mediate this process. In this study, expression plasmids encoding these five nucleoproteins were stably transfected into EC109 cells. Then, stable transfectant was characterized by a Dual-Luciferase Reporter Assay System. RT-PCR, real-time PCR, western blotting, specific kinase inhibitor treatment, and bioinformatics analyses were applied in this study. We found that MISP, KLF10, KLF15, PPP1R18, and RXRβ proteins could strongly respond to TPA stimulation and activate LCN2 transcriptional expression. MEK, ERK, JNK, and P38 kinases were involved in the LCN2 transactivation. Furthermore, the MEK-ERK signal pathway plays a major role in this biological process but does not involve PKCα signaling