There are many interesting optimization problems associated with the packing and covering of objects in a closed volume or bounded surface Typical examples arise in classical physics or chemistry where questions of the kind what does the densest packing of atoms or molecules look like when a crystal or macro molecule is formed with the lowest energy Also engineering and information science conf...

erythematosus arising in a patient with chronic silicosis. may be formed and released from macrophages. Parallels to Rheumatol Int 1997; 16: 217–218. the pathogenesis of silica-induced scleroderma are given, as 7. Siebels M, Schulz V, Andrassy K. Systemischer Lupus erythobserved in 111 patients in our department (14). ematodes und Silikose. Dtsch Med Wochenschr 1995; 120: As silica cannot be re...

The veterinary use of antimicrobial drugs in food producing animals may result in residues in food, that might modify the consumer gut flora. This review compares three model systems that maintain a complex flora of human origin: (i) human flora associated (HFA) continuous flow cultures in chemostats, (ii) HFA mice, and (iii) human volunteers. The "No Microbial Effect Level" of an antibiotic on...