Search

The ligand engineering of inorganic lead halide perovskite quantum dots (PQDs) is an indispensable strategy to boost their photoluminescence stability, which is pivotal for optoelectronics applications. CsPbX3 (X = Cl, Br, I) PQDs exhibit exceptional optical properties, including high color purity and tunable bandgaps. Despite their promising characteristics, environmental sensitivity poses a challenge to their stability. This article reviews the solution-based synthesis methods with ligand engineering. It introduces the impact of factors like humidity, temperature, and light exposure on PQD's instability, as well as in situ and post-synthesis ligand engineering strategies. The use of various ligands, including X- and L-type ligands, is reviewed for their effectiveness in enhancing stability and luminescence performance. Finally, the significant potential of ligand engineering for the broader application of PQDs in optoelectronic devices is also discussed. [ABSTRACT FROM AUTHOR]

As a former British colony, Hong Kong's political system differs significantly from the Chinese Mainland. After Hong Kong's (HK) return, the Chinese central government adopted the policy of "one country, two systems" to cope with the differences in the political systems of the two places, hoping to find common ground while reserving differences for future development. Nonetheless, this policy and excellent ideas have been severely impacted due to a series of wars. In Hong Kong, the one country, two systems policy has encountered numerous obstacles, and the political system of the Chinese Mainland has also been affected. This study will compare and analyze the Chinese Mainland and Hong Kong political systems from the standpoint of the fundamental law, policy documents, history, and the humanities. This study analyzes the historical, sociological, and geopolitical factors contributing to these frameworks and identifies their primary differences and similarities. [ABSTRACT FROM AUTHOR]

Objective To explore the optimal method for in vitro cultivation of SD fetal rat cardiomyocytes. Methods Cardiomyocytes of SD fetal rats from pregnant rats on gestational day 19 were obtained by digesting cardiac tissues with 0.8 g/L trypsin and 0.4 g/L collagenase II. With differential centrifugation and different animal serums (bovine fetal serum or horse serum), we tried to look for the optimal culture conditions. The morphology and beat frequency of cardiomyocytes were observed under an inverted phase-contrast microscope. In addition, the expressions of alpha-sarcomeric actinin (α-SA) and cardiac troponin I (cTnI) in the cultured cardiomyocytes were detected by immunofluorescence staining to identify cardiomyocytes and the purity of these cells after 24, 48, 72 and 96 hours of cultivation. Results After 24 hours of cultivation, we had seen a majority of adherent cells and a few of suspension cells, and also seen some pulsating cardiomyocytes. The positive rates of α-SA and cTnI in the cardiomyocytes of the horse serum-cultured group were obviously higher than those in the bovine fetal serum-cultured group after 48, 72 and 96 hours of cultivation. Conclusion Co-digestion with trypsin and collagenaseII in combination with horse serum cultivation are easier to cultivate fetal rat cardiomyocytes.