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BOSTON ( TheStreet) -- TheStreet.com's stock-rating model upgraded Buckeye GP Holdings ( BGH) to "buy." The company owns general-partner interests in Buckeye Partners ( BPL), which transports and stores refined petroleum products, and is also rated "buy."

The numbers: Second-quarter revenue fell 29% to $351 million, but net income surged 84% to $9.7 million, or 35 cents a share. Its gross margin rose from 16% to 25% and its operating margin climbed from 12% to 19%. The company has a weak financial position, demonstrated by its quick ratio of 0.5 and debt-to-equity ratio of 6.3.

The stock: Buckeye GP Holdings is up 78% this year, beating major U.S. indices. The stock trades at a price-to-earnings ratio of 18, a discount to oil and gas storage peers and the market. The shares pay a cash distribution yield of 6.5%. Cash distributions are taxed differently than dividends.

The model upgraded IntegraMed America ( INMD), a provider of vein care and fertility services, to "buy."

The numbers: Second-quarter net income ascended 23% to $1.1 million and earnings per share climbed 30% to 13 cents. Revenue grew 13% to $56 million. Its gross margin was little changed at 13% and its operating margin remained stable at 4%. A quick ratio of 0.7 indicates less-than-ideal liquidity. A debt-to-equity ratio of 0.5 reflects conservative leverage.

The stock: IntegraMed America is up 27% this year, more than the Dow Jones Industrial Average and S&P 500 Index. The stock trades at a price-to-earnings ratio of 19, indicating parity with the market, but a premium to health-care-service peers.

The model upgraded gold explorer Jaguar Mining ( JAG) to "hold."

The numbers: The company swung to a second-quarter profit of $9.7 million, or 12 cents a share, from a loss of $350,000, or 1 cent, in the year-earlier period. Revenue increased 55% to $33 million. Its gross margin rose from 40% to 43%, but its operating margin dropped from 10% to 7%. The company has a strong financial position, with $77 million of debt, compared to $79 million of cash. A debt-to-equity ratio of 0.3 indicates fiscal prudence.

The stock: Jaguar Mining has more than doubled this year, outpacing major U.S. indices. As a result of net losses in the third and fourth quarter of 2008, the stock now trades at a price-to-earnings ratio of 95, a premium to gold peers and the market. The company doesn't pay dividends.

The model upgraded aircraft-components maker Triumph Group ( TGI) to "buy."

The numbers: Fiscal first-quarter net income decreased 27% to $18 million and earnings per share dropped 16% to $1.30. Revenue fell 1% to $316 million. Its gross margin declined from 31% to 29% and its operating margin fell from 14% to 12%. A quick ratio of 1.1 demonstrates ample liquidity and a debt-to-equity ratio of 0.5 indicates conservative leverage.

The stock: Triumph Group is up 6% this year, underperforming major U.S. indices. The stock trades at a price-to-earnings ratio of 8, a discount to aerospace and defense peers and the market. The shares offer a dividend yield of less than 1%.

The model upgraded health-care-equipment maker Young Innovations ( YDNT) to "buy."

The numbers: Second-quarter revenue declined 5% to $25 million, but net income advanced 7% to $3.3 million and earnings per share climbed 11% to 42 cents. Its gross margin rose from 57% to 60% and its operating margin increased from 19% to 22%. A quick ratio of 1.2 indicates ample liquidity and a debt-to-equity ratio of 0.2 demonstrates modest leverage.

The stock: Young Innovations is up 45% this year, beating major U.S. indices. The stock trades at a price-to-earnings ratio of 14, a discount to health-care-equipment peers and the market. The shares offer a dividend yield of less than 1%.

-- Reported by Jake Lynch in Boston.