Desoxycholate Lactose Agar Difco 242010, 500g. For isolating and differentiating gram-negative enteric bacilli; for enumerating coliforms from water, wastewater, milk and dairy products. Desoxycholate Lactose Agar Difco 242010 - buy online through Voigt Global Distribution, your dealer distributor for all BBL DIFCO BD Microbiology products.