Quantitative determination of carbohydrate antigen 153 (CA153) in human serum plays an important role in early diagnosis of breast cancer. In this work. a highly sensitive and selective biosensor for CA153 detection was developed based on a fluorescent resonance energy transfer (FRET) strategy. in which near-infrared (NIR)-excitable upconversion nanoparticles (UCNPs) and the commercia... https://www.markbroyard.com/special-deal-ornamental-onion-allium-summer-beauty-for-cheap-flash-choice/