20-DMA (8,906) is likely to act as a stiff resistance for Nifty, followed by 9,039 and above this, Nifty may test 9,390 levels. On the downside, the level of 8,500 is likely to act as a strong support. Stocks in news: Advaced Enzyme Technologies, Galaxy Surfactants, Hero Motocorp, Deepak Nitrite.