This pap er introduces something of photodynamic therapy including the basic principles,pho tosensitizers and recent situation of clinical trial.Its light source,research and clinical applications to malignant tumors are also presented.

Bovine spongiform encephalopathy (BSE) is an infectious disease which can threaten animal husbandry and human health seriously. The disease mainly violates the central neural system. This article selectively reviewed current researches on the analytical detection of BSE and transmissible spongiform encephalopathy (TSE).
Animals ; Cattle ; Encephalopathy, Bovine Spongiform ; diagnosis ; transmission ; virology ; Humans ; Prions ; isolation & purification