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.
A Gram stain is used, along with a culture of the material from an infected site, to identify the cause of a bacterial infection. The Gram stain provides preliminary results on whether bacteria are present and the general type, such as the shape and whether they are Gram-positive or Gram-negative.