1. Instituto de Microbiologia Professor Paulo de Góes, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
2. Center for Solid State Science, Arizona State University, Tempe, Arizona
3. Instituto de Ciências Biomédicas, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
4. Department of Physics, California Polytechnic State University, San Luis Obispo, California
5. Departments of Geology and Chemistry/Biochemistry, Arizona State University, Tempe, Arizona