Apollo Group Inc. (Nasdaq: APOL) has acquired a majority stake in Universidad Latinoamericana, an accredited private university in Mexico City, from Carlyle Mexico Partners. No financial terms were disclosed. Apollo Global is a $1 billion joint venture formed last year, and is 19.9 percent owned by The Carlyle Group, which manages the Carlyle Mexico Partners fund.

Capvis has acquired a majority stake in Bartec from Allianz Capital Partners, for an undisclosed amount. Bartec is a German provider of industrial safety technology.

Diamond Castle Holdings has completed its acquisition of York Label from Wind Point Partners, for an undisclosed amount. York Label is an Omaha, Neb.-based provider of labeling and packaging solutions to the food, beverage, consumer products and pharmaceutical markets.

H.I.G. Capital has sold Stream Holdings Corp. to Global BPO Services Corp. (AMEX: OOO), a blank check company backed by Ares Management. The deal is valued at $200 million in cash. Stream is a Richardson, Texas-based provider of technical support and other business process outsourcing services. It was acquired by H.I.G. in 2003 via a $75 million acquisition of Software Spectrum’s call center unit, and later grew via the 2004 acquisition of Stream from Solectron.

IK Investment Partners has agreed to buy Axtone SA, Europe’s largest manufacturer of rail freight buffers, from Advent International. Financial terms weren’t disclosed. Advent formed Axtone via the simultaneous acquisitions in 2006 of Poland’s Kamax and Germany’s Keystone Bahntechnik.

Leeds Equity Partners has acquired Ex Libris Group, an Iceland-based provider of automation solutions for academic, research and national libraries, from Francisco Partners. No financial terms were disclosed.

MML Capital Partners has acquired PaR Systems, a Shoreview, Minn.-based maker of specialized and standard automation equipment, from American Capital Ltd. No financial terms were disclosed. Edgeview Partners advised American Capital on the deal.

Provident Energy Trust (NYSE: PVX) has agreed to sell its 96 percent interest in BreitBurn Energy Co. to Metalmark Capital Partners, Greenhill Capital Partners and a listed energy partnership. The deal is valued at $305 million. BEC is a Provident subsidiary whose primary assets are non-producing crude reserves in California.

Sterling Investment Partners has led a buyout of Miller Heiman Inc., a Reno, Nev.-based sales consulting and training company, from Leeds Equity Partners. Also participating on the buy-side were GE Capital, Madison Capital and York Street Capital Partners. Pricing terms weren’t disclosed.