Previously, most studies have relied on self-reported menstrual-cycle data and classified a wide range of cycle days as "fertile" [see for example 9], [10], [12] [14], [17], [22], [25] [27].
Given that PLCζ plays a fundamental role in the process of oocyte activation, it is logical to deliberate how this knowledge might assist with the generation of a male contraceptive agent for fertile males, for example by specifically blocking the physiological action of PLCζ.
Morality has provided an especially fertile source of examples and problems for the theory of practical reason.
The beginnings of farming, 10,000 or more years ago, have often been discussed in relation to a few discrete "centres of origin", for example the Fertile Crescent of the Middle East, and Central America.
Around those centerpieces were more examples of fertile artistic intermingling, like "Entr'acte," a sublimely surreal Dadaist film by René Clair with a clattering score by Erik Satie (who helps to fire a cannon from a rooftop in the film).
Around those centerpieces were more examples of fertile artistic intermingling, like "Entr'acte," a sublimely surreal Dadaist film by Ren?lair with a clattering score by Erik Satie (who helps to fire a cannon from a rooftop in the film).
For example, cells of fertile donors can be transplanted into sterile Oryzias latipes × Oryzias curvinotus hybrids.
Here we investigate the first example of dimorphic fertile sperm within a species, which is associated with alternative male mating tactics and alternative fertilisation environments.
It isn't easy to find another example of such a rich, fertile theory conjured, as it were, out of nothing.
There are surprisingly many examples where viable, fertile and even well adapted offspring form by species hybridization in mammals [ 18, 49, 50].
