I think it has to do with the news associated with the note 3/29/2011. pertaining to uncertainties with Canon LTD and issuance of warrants
Altair Nanotechnologies, Inc. (Nasdaq: ALTI) 25.2% LOWER; has entered into several agreements for the private placement for $6.4 million of common stock. Under the terms of the transaction, these institutional investors will purchase 3.6 million shares of Altair common stock at a purchase price of $1.784 per share.
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