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.
Boxwood can be pruned easily and has the ability to grow from old wood. To maintain trimmed forms and hedges you need to prune them twice a year. The first time should be done around late May or mid-June, after the first growth spurt. You can prune for a second time in September or October so the plants will look tight when winter comes. It is best to do it when the weather is cloudy to reduce the chance of burning the leaves. By cutting them you damage part of the leaves and these will turn brown.