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.
In the case of soldering process, flux works in two ways cleaning using some chemical reaction they removes oxides from metal surface and this way improves wetting with melted solder. In high temperature metal joining processes (welding, brazing and soldering), the primary purpose of flux is to prevent oxidation base filler materials 27 jul 2013.