Propolis propolis has approximately 50 constituents, primarily resins and vegetable balsams (50%), waxes (30%), essential oils (10%), and pollen (5%). Propolis also contains persistent lipophilic acaricides, a natural pesticide that deters mite infestations. In neotropical regions, in addition to a large variety of trees, bees may also gather resin from flowers in the genera "Clusia" and "Dalechampia", which are the only known plant genera that produce floral resins to attract pollinators. "Clusia" resin contains polyprenylated benzophenones. In some areas of Chile and Argentina Andean valleys, propolis contains viscidone, a terpene from "Baccharis" shrubs, and in Brazil and Paraguay, naphthoquinone epoxide has
Glue semantics syntactic formalisms have also been proposed; besides LFG, glue analyses have been proposed within HPSG, context-free grammar, categorial grammar, and tree-adjoining grammar. Glue is a theory of the syntax-semantics interface which is compatible not only with various syntactic frameworks, but also with different theories of semantics and meaning representation. Semantic formalisms that have been used as the meaning languages in glue semantics analyses include versions of discourse representation theory, intensional logic, first-order logic, and natural semantic metalanguage. Glue semantics Glue semantics, or simply Glue (Dalrymple et al. 1993; Dalrymple 1999, 2001), is a linguistic theory of semantic composition and the