loodstream and infect tumor cells anywhere in the body. Healthy tissue was unharmed by the virus, which was derived from a strain used in the smallpox vaccine and engineered to enhance its anti-cancer properties. "We are very excited because this is the first time in medical history that a viral therapy has been shown to consistently and selectively replicate in cancer tissue," according to the institute's cancer scientist, Dr. John Bell. The ground-breaking trial was intended to test only safety -- but in six of the eight patients given the highest doses, the tumors shrank or stopped growing. The 23 patients in the trial had a range of advanced cancers that nogeothermal power. Despite growing installations, manufacturers are feeling a pinch. Prices have fallen faster than many manufacturers have cut costs, and smaller manufacturers in expensive countries feel the pain more than larger companies operating in China and other low-cost countries. "You can't make any money manufacturing in the U.S. because you can't compete," said Paula Mints, a solar market analyst at Navigant Consulting. U.S. solar-panel makers supplied about 6% of global demand in 2010. That figure is likely to decline this year, Mints predicted. Solon decided to shut down its U.S. factory before the recent price slide because large, low-priced Chinese manufacturers had scaled up production, said Ed Wegener, vice president of Solon's U.S. operations. "For us to think we could make what is essentially a commodity product, versus big Chinese players, that didn't make sense," Wegener said in an interview. "We recognized the reality earlier than some people have." Solon still operates three factories in Europe. In the U.S., the company will sell its European panels and build projects using some of its own panels and some made by Asian rivals. As part of a plan to boost U.S. renewable-energy generation and create jobs, the Obama administration has provided nearly $1.6 billion in loan guarantees to solar manufacturers and $14.3 billion in loan guarantees to solar power-plant developers. U.S.-based First Solar Inc. (FSLR), one of the world's largest manufacturers and developers, is getting more than $5.3 billion in loan guarantees to build four large solar farms. The company has a solar-panel factory in Ohio, but makes most of its products in Malaysia. First Solar didn't seek a loan guarantee for a second U.S. factory it is building. Company executives have suggested the U.S. can best support manufacturing by creating long-term financial incentives and a national renewable-energy