This excerpt taken from the XIDE DEF 14A filed Jul 24, 2009.
How many shares must be present or represented to transact business at the annual meeting?
The presence or representation at the meeting, in person or by proxy, of the holders of a majority of the aggregate voting power of the common stock outstanding on the Record Date will constitute a quorum, permitting the conduct of business at the meeting. As of the Record Date, 75,519,074 shares of common stock, representing the same number of votes, were outstanding. Accordingly, the presence of the holders of common stock representing at least 37,759,538 votes will be required to establish a quorum.
Proxies received by us but marked as abstentions, votes withheld and broker non-votes will be included in the calculation of the number of votes considered to be present at the meeting.