Preparation, structure and application of polysaccharides from .

polysaccharides (PCPs) are fungal polysaccharides derived from the traditional Chinese medicine . They are considered an important active ingredient for their pharmacological activity. Herein, the extraction, separation and purification, structure, and application of PCPs are reviewed.

The utilization of quantum dot labeling as a burgeoning technique in the field of biological imaging.

Quantum dots (QDs), with their unique optical and physical properties, have revolutionized the field of biological imaging, providing researchers with tools to explore cellular processes and molecular interactions in unprecedented detail. This review explores the diverse properties of QDs, emphasizing their application in biological imaging and addressing both their advantages and challenges. We discuss the developments in QD technology that have facilitated their integration into bioimaging, highlighting the role of surface modifications in enhancing their biocompatibility and functionality.

Retraction: The synthesis and biological activity of marine alkaloid derivatives and analogues.

[This retracts the article DOI: 10.1039/D0RA05856D.].

Retracted Article: The synthesis and biological activity of marine alkaloid derivatives and analogues.

The ocean is the origin of life, with a unique ecological environment, which has given birth to a wealth of marine organisms. The ocean is an important source of biological resources and tens of thousands of monomeric compounds have been separated from marine organisms using modern separation technology. Most of these monomeric compounds have some kind of biological activity that has attracted extensive attention from researchers.

Synthesis and biological activities of local anesthetics.

Local anesthetics are mainly used in stomatology, ophthalmology, gynecology and surgery to temporarily relieve pain. Local anesthetics act on nerve endings or around nerve trunks, and are combined with specific sodium ion (Na) channel sites on the nerve membrane. They can affect the membrane potential by reducing Na passage through sodium ion channels, thus blocking the generation and conduction of nerve impulses, reversibly blocking the generation and conduction of sensory nerve impulses.