BACKGROUND Clostridium difficile is the major cause of nosocomial antibiotic-associated diarrhoea with the potential risk of progressing to severe clinical outcomes including death. It is not unusual for Clostridium difficile infection to progress to complications of toxic megacolon, bowel perforation and even Gram-negative sepsis following pathological changes in the intestinal mucosa. These c...

p b u c v a c From the Department of Endodontics, University of Caliornia at San Francisco, San Francisco, California. Address requests for reprints to Dr. Harold E. Goodis, epartment of Endodontics, University of California at San rancisco, 707 Parnassus Avenue Box 0758, San Francisco, CA 4143. E-mail address: [email protected]. 099-2399/$0 see front matter Copyright © 2006 by the America...

During its first cycle of observations, the MAGIC (Major Atmospheric Gamma-ray Imaging Cherenkov) telescope has observed very high energy γ-rays from fife galactic objects: the Crab Nebula, the SNRs HESS J1813-178 and HESS J1834-087, the Galactic Center and the γ-ray binary LS I +61 303. After a short introduction to the MAGIC telescope and the data analysis procedure, the results of these fife...

Eliahou, S., The 3x+ 1 problem: new lower bounds on nontrivial cycle lengths, Discrete Mathematics 118 (1993) 45556. Let 7’: N -+ N be the function defined by T(n) = n/2 if n is even, T(n) = (3n + 1)/2 if n is odd. We show, among other things, that any nontrivial cyclic orbit under iteration of T must contain at least 17 087 915 elements.