Collection
And
Enumeration
of
Aeroallergens - Various methods have been developed to collect and quantify the pollen and fungal aeroallergens. Durham's gravitational sampler, developed in 1940s is the simplest and most commonly used sampler even today in some parts of the world including India. It is a simple device consisting of two metallic discs separated by three struts.
The microscope slide coated with adhesive is mounted an inch above the centre of the lower disc, upper disc acting as rain shield. The slides are exposed for 24 hr. The sampler can be used for qualitative analysis of various kinds of spores, particularly larger ones, giving a rough idea of seasonal trend.
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