Here are three stocks with buy ranks and strong growth characteristics for investors to consider today, August 21:Sterling Infrastructure, Inc. (STRL) : This infrastructure services company carries a Zacks Rank #1, and has witnessed the Zacks Consensus Estimate for its current year earnings increasing 6.8% over the last 60 days.Sterling Infrastructure has a PEG ratio of 1.34 compared with 1.75 for the industry. The company possesses a Growth Score of B.Pilgrim's Pride (PPC) : This meat processing company ca ...