SALEM, Ore. — With 400,000 uninsured Oregonians expected to get health insurance in the coming years, the state and medical community are scrambling to make sure there are doctors, nurses and other health care providers available to treat them. Many of Oregon's rural and minority communities already are short of the recommended doctor-patient ratios — a problem that will only get worse when most Americans are required to have health coverage beginning Jan. 1. With an eye on the coming tide of newly insured residents, state lawmakers this year approved scholarships and loan repayment programs designed to encourage medical school graduates to practice in underserved areas instead of the flashier urban centers.