As early as the eighteenth century, birds were generally placed immediately ahead of flying fishes in the "chains of being" postulated by the naturalists of that time.
This interpretation also has the formal advantage that the Born statistical interpretation emerges as a theorem rather than being postulated as an independent axiom.
Here it is unclear whether 'postulation' refers to the entities being postulated, or the hypotheses which are doing the postulating, or both.
In this study attempts have been made to develop a functional model for the catechol binding site of the human dopamine D2 receptor, with two primary models being postulated based on the presence of a disulfide bridge in the second extracellular loop.
Symbiotic associations between bacteria and insects are widespread in nature, being postulated as one of the key factors of their evolutionary success.
However, the presence in many potentially non-pathogenic bacteria and inconsistencies in experimental data have led to a number of different functions being postulated for this secretion system.
