text: J J Helps Boost Blue Chips  NEW YORK (Reuters) - U.S. blue chips rose  on Thursday,  boosted by Johnson   Johnson &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=JNJ.N target=/stocks/quickinfo/fullquote"&gt;JNJ.N&lt;/A&gt; following its move to buy  Guidant Corp. &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=GDT.N target=/stocks/quickinfo/fullquote"&gt;GDT.N&lt;/A&gt;, but market gains were limited after  Goldman Sachs posted disappointing revenues.