Small nocturnal mammals must balance their activity to maximize foraging efficiency while reducing vulnerability predators, and moonlight has been widely investigated as a predation risk cue. Didelphis aurita, marsupial, can act both competitor an intraguild predator, prey, increasing or under this condition, respectively. We evaluated the effect of moonlight, temperature, age on bimodal patter...

In the course of a study of pollen wall development in the Gramineae two interesting relationships were noted: the locule wall and tapetal cells were bordered by spheroids which were similar chemically (resistant to acetolysis) and morphologically to the pollen exine. The pollen exine as well as the wall of the spheroids was perforated by submicroscopic channels. In the mature anther the sphero...