Americans are highly confident about the biotech industry’s ability to find cures for diseases and develop new alternative fuels. But biotch executives have work cut out for themselves in convincing Americans - especially women - about the benefits of genetically modified foods, according to new survey results released yesterday in conjunction with the first day of the 2007 BIO International Convention in Boston. [...] Only 47 percent of voters surveyed view genetically modified foods as positive - while 43 percent said the practice is ”troubling.”