Capital Normal University

About: Capital Normal University is a education organization based out in Beijing, China. It is known for research contribution in the topics: Terahertz radiation & Quantum entanglement. The organization has 11441 authors who have published 11988 publications receiving 159071 citations. The organization is also known as: Shǒudū Shīfàn Dàxué.

Synthesis of Ag2S–Ag Nanoprisms and Their Use as DNA Hybridization Probes

Abstract: A simple synthetic route to prepare Ag2S–Ag nanoprisms consists of the facile addition of Na2S to a solution of triangular Ag nanoprisms. The resulting Ag2S–Ag nanoparticles are more stable in solution than the original Ag nanoprisms, and two surface plasmon resonance (SPR) bands of the original Ag nanoprisms still remain. In addition, the SPR bands of the Ag2S–Ag nanoprisms are tunable over a wide range. The Ag2S–Ag nanoprisms can be directly bioconjugated via well-established stable Ag2S surface chemistry with readily available sulfur coupling agents. The nanoprisms are used in the hybridization of functionalized oligonucleotides, and show promise as probes for future biosensing applications.

A diethylaminophenol functionalized Schiff base: crystallization-induced emission-enhancement, switchable fluorescence and application for security printing and data storage

Abstract: In this study, we report the synthesis and photoluminescence (PL) behaviour of a new luminogen, SBOH, a diethylaminophenol functionalized Schiff base. SBOH possesses electron donor (D) and acceptor (A) units, showing twisted intramolecular charge transfer (TICT) properties. Interestingly, SBOH is weakly emissive in the amorphous phase but becomes highly emissive upon crystallization as confirmed by spectroscopic methods and fluorescence microscopy; in other words, SBOH is crystallization-induced emission-enhancement (CIEE)-active. Similar to the typical CIEE luminogens, the emission of SBOH is also sensitive to molecular packing modes. The weak emission of amorphous SBOH can be switched on via a deprotonation process caused by strong alkali. Meanwhile, exposure to acetic acid vapour rapidly switches the emission to the “off” state through re-protonation. The protonation and deprotonation processes display good reversibility. This deprotonation process is further confirmed by 1H NMR analysis and UV-vis spectroscopy. By taking advantage of the stimuli responsive fluorescence, a convenient and efficient technology for security printing and data storage is designed.

Pollution Characteristics and Health Risk Assessment of Airborne Heavy Metals Collected from Beijing Bus Stations.

Abstract: Airborne dust, which contains high levels of toxic metals, is recognized as one of the most harmful environment component. The purpose of this study was to evaluate heavy metals pollution in dustfall from bus stations in Beijing, and to perform a risk assessment analysis for adult passengers. The concentrations of Cd, Co, Cr, Cu, Mo, Ni, Pb, V and Zn were determined by inductively coupled plasma mass spectroscopy (ICP-MS). The spatial distribution, pollution level and potential health risk of heavy metals were analyzed by Geographic Information System (GIS) mapping technology, geo-accumulation index and health risk assessment model, respectively. The results indicate that dust samples have elevated metal concentrations, especially for Cd, Cu, Pb and Zn. The nine metals can be divided into two categories in terms of spatial distribution and pollution level. Cd, Cr, Cu, Mo, Pb and Zn reach contaminated level and have similar spatial patterns with hotspots distributed within the Fifth Ring Road. While the hot spot areas of Co and V are always out of the Fifth Ring Road. Health risk assessment shows that both carcinogenic and non-carcinogenic risks of selected metals were within the safe range.

iTRAQ‐based quantitative proteomic analysis reveals new metabolic pathways of wheat seedling growth under hydrogen peroxide stress

Abstract: As an abundant ROS, hydrogen peroxide (H2O2) plays pivotal roles in plant growth and development. In this work, we conducted for the first time an iTRAQ-based quantitative proteomic analysis of wheat seedling growth under different exogenous H2O2 treatments. The growth of seedlings and roots was significantly restrained by increased H2O2 concentration stress. Malondialdehyde, soluble sugar, and proline contents as well as peroxidase activity increased with increasing H2O2 levels. A total of 3 425 proteins were identified by iTRAQ, of which 157 showed differential expression and 44 were newly identified H2O2-responsive proteins. H2O2-responsive proteins were mainly involved in stress/defense/detoxification, signal transduction, and carbohydrate metabolism. It is clear that up-regulated expression of signal transduction and stress/defence/detoxification-related proteins under H2O2 stress, such as plasma membrane intrinsic protein 1, fasciclin-like arabinogalactan protein, and superoxide dismutase, could contribute to H2O2 tolerance of wheat seedlings. Increased gluconeogenesis (phosphoenol-pyruvate carboxykinase) and decreased pyruvate kinase proteins are potentially related to the higher H2O2 tolerance of wheat seedlings. A metabolic pathway of wheat seedling growth under H2O2 stress is presented.