Figure 1 (IMAGE) Institute for Basic Science Caption If the mixture of silver nitrate, glutathione, and sodium borohydride is stirred under an atmosphere not containing enough oxygen, the product is a blend of polydisperse and not fluorescent particles (left). Only when there is enough oxygen delivered, the reaction mixture yields stable and strongly fluorescent silver nanoclusters. Credit Institute for Basic Science Usage Restrictions Attribution Required License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.