The bovine spongiform encephalopathy, namely mad cow disease, which broke out in Britain in later 80.s last century and its expression on human being called CJD are kinds of serious infections which can hurt the nerve center. This article described the pathogenesis and the way to detect it.

The connection between platinum group metals.chemistry and life science has been introduced. Significance of PGM in medical and environmental sciences are especially discussed,including its founding and characters,medicines of Pt,Ru and Os,importance in purifying tail gas, the problemsof PGM to the urban environment and the effect on people.s health.