Allergies:

Basophil or Polymorphonuclear Basophil: "leukocyte" characterized by large granulations 
(grains) which have a pronounced affinity for basic dyes (high pH). They contain histamine 
and many other mediators of allergy (such as mast cells).

Betulacea:  a family of plants and shrubs (petaless flowers) with seeds grouped in catkins 
and deciduous leaves. A few examples: birch, alder, hornbeam, hazel tree and almond tree.

Bioluminescence: a property of luciferin (substance found in certain bacteria, mollusks and 
especially the firefly) which becomes luminescent thanks to luciferase. This property is 
used for various assay tests, in particular in the Enhanced Chemiluminescence assay (ECL 
test) for labelling the Ag-IgE reaction.

Bronchodilator:  a medicinal product with the property of being able to dilate the bronchi thus 
increasing bronchial diameter. Used in particular in the treatment of asthma.

Bronchospasm: spasmodic contraction of the bronchi which results in a temporary 
narrowing of the bronchial diameter and thus respiratory impairment. It is one of the 
symptoms of bronchial asthma.