When an allergic individual is exposed to a sensitizing allergen, the body makes a specific IgE, one that is able to recognize only that allergen. (see above chart). Millions of mast cells and basophils are all over the body.
Urban morphology is the study of the form of human settlements and the process of their formation and transformation. The study seeks to understand the spatial structure and character of a metropolitan area, city, town or village by examining the patterns of its component parts and the process of its development.
However, the term as such was first used in bioscience. Recently it is being increasingly used in geography, geology, philology and other subject areas. In geography, urban morphology as a particular field of study owes its origins to Lewis Mumford, James Vance and Sam Bass Warner.Peter Hall and Michael Batty of the UK and Serge Salat, France, are also central figures.ypically, analysis of physical form focuses on street pattern, lot (or, in the UK, plot) pattern and building pattern, sometimes referred to collectively as urban grain.