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.
Sometime between the changing leaves in fall and flower blooms in spring, your trees need a trim. Anytime between late fall and early spring is best for tree trimming or pruning. Talk to your local arborist about pruning before spring blooms emerge. Typically a tree's pruning cycle is 3 to 5 years, but type, size and health play a role in the cycle that will work best for your tree.