* Portugal bond yield at new high as bailout fears grow
* Wall Street buoyed by Texas Instruments deal
* Spot gold hits record high on safe-haven appeal
* Euro reverses loss,; world stocks end winning streak (Recasts, adds details, updates prices)
By Leah Schnurr
NEW YORK, April 5 (Reuters) - Spot gold notched a record high on Tuesday as a downgrade of Portugal's debt stirred a bid for safety, while on Wall Street a large U.S. technology company merger helped drive small gains.
The euro reversed losses to turn positive against the dollar after talk of a hawkish U.S. think-tank report on European Central Bank policy. The ECB is widely expected to raise interest rates by a quarter point when it meets on Thursday.
A rise in crude oil prices to 2-1/2 highs on unrest in oil-exporting countries fed inflation fears and supported the price of gold. Spot gold <XAU=> rose to a record high above $1,450 an ounce.
Wall Street shares crept higher after Texas Instruments <TXN.N> said it would buy rival National Semiconductor Corp <NSM.N> for $6.5 billion, driving National Semiconductor's stock up more than 70 percent.
The deal offset the impact of an interest rate hike by China, its fourth increase since October.[
]"These kinds of deals show that even with the rate hike and the ISM number, prices are still extremely attractive," said Tim Courtney, chief investment officer at Burns Advisory Group in Oklahoma City. "That's why the market is holding steady despite some bad news."
The Institute for Supply Management on Tuesday reported that growth in the U.S. services sector slowed in March.
Rating agency Moody's cut Portugal's sovereign debt by one notch, saying the incoming government would urgently need to seek financial aid from the European Union. Portuguese bond yields rose to euro lifetime highs. [
]"Even though Moody's still rates the sovereign two notches higher than Standard & Poor's, the downgrade is another blow to sentiment," said Gavan Nolan, an analyst at data monitor Markit.
Portugal's lending banks told the central bank on Monday that the country urgently needs a bridge loan and banks have virtually no more capacity to buy government debt, sources said. [
]Yields on Portugal's 10-year government bonds <PT10YT=TWEB> rose as high as 9.033 percent, while Portuguese stocks <
> slumped 1 percent. The Portuguese market fared worse than the broader FTSEurofirst 300 index < >, which provisionally closed up 0.2 percent.It was the highest close for European shares in almost four weeks, with energy shares rising with oil prices.
Credit default swaps implied a 41 percent probability of a Portuguese default within five years, compared with 33 percent at the end of February, data provider CMA said. [
]The euro <EUR=> fell against the dollar for the second day but trimmed losses after the talk of a hawkish U.S. think-tank report on European Central Bank monetary policy. The euro was last trading at $1.4236 up 0.13 percent.
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Graphics on Thursday's ECB meeting:
http://r.reuters.com/kah88r
Graphic on euro zone credit ratings:
http://r.reuters.com/pyh48r
Graphic on China rate rise: http://r.reuters.com/veh88r
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FOMC MINUTES ON TAP
Global stocks snapped a five-day winning streak with the MSCI All-Country World Index <.MIWD00000PUS> trading flat after hitting six-week highs in the previous session.
The Dow Jones industrial average <
> added 13.55 points, or 0.11 percent, to 12,413.58. The Standard & Poor's 500 Index <.SPX> rose 2.37 points, or 0.18 percent, to 1,335.24. The Nasdaq Composite Index < > gained 9.76 points, or 0.35 percent, to 2,798.95.Brent crude <LCOc1> prices topped $122 a barrel, recouping losses as worries about supply from oil-producing countries in Africa and the Middle East overshadowed China's rate hike. Brent futures were up $1.47 at $122.51 a barrel, while U.S. crude futures <CLc1> were flat around $108.46.
Federal Reserve Chairman Ben Bernanke said late on Monday that the recent spike in U.S. inflation was unlikely to persist.
But sustained higher oil prices could pose a serious threat to the global economic recovery and dampen risk appetite. Investors were awaiting the release of minutes from the latest rate-setting committee meeting of the Fed later in the afternoon. (Additional reporting by Nick Olivari and Rodrigo Campos; Editing by Leslie Adler)