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- W57872012 abstract "Fluorescent semiconductor quantum dots (QDs) are nanocrystals made of CdSe/CdTe-ZnS with radii of 1–10 nm (1-3). They can be tuned to emit in a range of wavelengths by changing their sizes and composition, thus providing broad excitation profiles and high absorption coefficients. They have narrow and symmetric emission spectra with long excited-state lifetimes of 20–50 ns, versus 1–10 ns for fluorescent dyes. QDs possess good quantum yields of 40–90% and high extinction coefficients, and they are more photo-stable than conventional organic dyes. QDs can be coated and capped with hydrophilic materials for additional conjugation with biomolecules such as peptides, antibodies, nucleic acids, and small organic compounds, which were tested in vitro and in vivo (3-7). Although many cells have been labeled with QDs in vitro with little cytotoxicity, there are limited studies of long-term QD toxicity in small animals (8-16). However, little is known about the toxicity or the mechanisms of clearance and metabolism of QDs in humans.α-Fetoprotein (AFP) is a single-chain glycoprotein (70 kDa) that is highly expressed in the fetal liver, gastrointestinal tract, and yolk sac (17); serum AFP levels are markedly low (<3 ng/ml) in healthy adults. Synthesis of AFP in adults appears in a variety of disease states, often associated with increased concentrations of AFP in serum. Markedly high serum levels are found in cancer patients with hepatoblastomas, nephroblastomas, hepatocellular carcinomas (HCC), and certain testicular tumors. Yu et al. (18, 19) prepared QDs conjugated with anti-AFP monoclonal antibodies to detect accumulation and retention of AFP at the site of HCC tumors. Anti-AFP-QDs are being studied as a contrast agent for imaging AFP expression in HCC cancer cells." @default.
- W57872012 created "2016-06-24" @default.
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- W57872012 date "2009-02-24" @default.
- W57872012 modified "2023-09-27" @default.
- W57872012 title "Anti-α-Fetoprotein antibody-quantum dots" @default.
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