The mechanism underlying temporal correlations among blood oxygen level-dependent signals is unclear. We used oxygen polarography to better characterize oxygen fluctuations and their correlation and to gain insight into the driving mechanism. The power spectrum of local oxygen fluctuations is inversely proportional to frequency raised to a power (1/f) raised to the beta, with an additional posi...

In a partially reformed economy, distortions beget distortions. Segments of the economy that are freed from centralized control respond to the rent-seeking opportunities implicit in the remaining distortions of the economy. The battle to capture, and then protect, these rents leads to the creation of new distortions, even as the reform process tries to move forward. In this paper I illustrate t...

Douglas Shearer, Director of Communications for The Permanente Federation. E-mail: [email protected]. Mark Littlewood, MPA, CHE, CPHRM, Clinical Risk Management and Patient Safety, The Permanente Federation. E-mail: [email protected]. Introduction Despite advances in detection and treatment of breast cancer in recent years, this disease remains the leading cause of new cancer cases ...