As degranulation occurs, it causes the mast cell or basophil to release a series of chemicals that orchestrate the allergic reaction. Within every mast cell or basophil are 500 to 1500 granules containing more than thirty different allergy-causing chemicals.
Urban design is an inter-disciplinary subject that unites all the built environment professions, including urban planning, landscape architecture, architecture, civil and municipal engineering.
Engineering Design. the process of creating a design that is an original representation, that is, a prototype, for a proposed object or system. Various design phases and stages are distinguished, each with a specific character. The subject area of engineering design is constantly expanding.