Product managers often start with a product requirements document (PRD). A product requirements document defines the product you are about to build: It outlines the product's purpose, its features, functionalities, and behavior. Next, you share the PRD with (and seek input from) stakeholders - business and technical teams who will help build, launch or market your product.
For bacteria: The two major families of common bacteria are distinguished by the chemistry of their walls, specifically the ability of iodine to mordant their staining with crystal violet and prevent its being removed with strong solvent. Gram positives include staph and strep, while gram negatives include e. Coli.
The final and third. step is applying a counter stain. A counter stain is used to stain all unstained biological. materials. Counter stains are usually a contrasting color to the primary stain. With the. Gram stain, the primary stain colors the cells violet and the counter stained bacteria are. red. Violet cells are âGram positiveâ because they have reacted to the stain.