Salmonella-Shigella plates. Salmonella-Shigella (SS) plates are used to detect bacterial contamination on raw meat. Salmonella-Shigella agar plates contain lactose, bile salts, ferric citrate, and neutral red.The bile salts select for Gram-negative bacteria.almonella-Shigella plates. Salmonella-Shigella (SS) plates are used to detect bacterial contamination on raw meat. Salmonella-Shigella agar plates contain lactose, bile salts, ferric citrate, and neutral red.
The best time to prune them is in early spring, just before they put on their growth spurt. You can do minor shaping and pruning at other times of year, too. Test Garden Tip: Save on holiday decorations by snipping a few branches for winter holiday greenery.
An excellent time to prune oaks is February and March. Fruit Trees --The best time to prune fruit trees is from late February to early April. Fruit trees pruned in fall or early winter may be susceptible to winter injury. Grapes --Prune grapevines in March or early April. Grapevines pruned at this time of year will bleed heavily. The bleeding, however, is not a problem.