text: CoTherix, Google Rise Before the Bell  NEW YORK (Reuters) - Shares of CoTherix Inc. &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=CTRX.O target=/stocks/quickinfo/fullquote"&gt;CTRX.O&lt;/A&gt; rose  2.7 percent  before the bell on Tuesday after Piper Jaffray  initiated coverage of the biopharmaceutical company with an  "outperform" rating and a \$10 price target.