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.
1 The best time to prune arborvitae is in early summer after the new growth has fully developed, and again in mid-to-late August. 2  The key to successful pruning is to do little at a time and often. 3  Don't wait until a branch has protruded far out of line before trimming it.arnings. 1  The best time to prune arborvitae is in early summer after the new growth has fully developed, and again in mid-to-late August. 2  The key to successful pruning is to do little at a time and often. 3  Use sharp, clean pruning tools; this will be less stressful to the tree, which means faster healing.