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this is not a new phenomenon and has been observed at the very beginning of QD use in biology (more than 10 years ago).
The idea is that some of the QDs are dark (this is why the quantum yield (QY) is usually much less than 1, or at least becomes  so in real life situations). This is because of surface defects, imperfect coating, etc... However, cells contain a lot of molecules (as you can guess), among which small cystein-rich or thiolated molecules. This group (-SH) is known to passivate QD's surface very well, increasing the QY and in some case suppressing the blinking of individual QDs. The longer the QDs are in cells. the greater this passivation... This is what you are observing. Unfortunately, short of having perfectly passivated QDs from the get-go, you will always observe this in live cells...

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Originally posted by mofatuzi at 2010-05-28 14:56:36:
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this is not a new phenomenon and has b ...

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