UK's Niox Group receives sweetened buyout proposal from Keensight Capital
March 20 (Reuters) - British medical device maker Niox Group NIOX.L said on Thursday buyout firm Keensight Capital had sweetened its proposal to buy the company to 81 pence per share, or 322.4 million pounds ($417.48 million). ($1 = 0.7723 pounds) (Reporting by Raechel Thankam Job; Editing by Krishna Chandra Eluri) ((RaechelThankam.Job@thomsonreuters.com;))