Sexual differences for emigration behavior in natural populations of Drosophila melanogaster.

Evolutionary biology considers migration behavior as central in genetic structure of populations and speciation. Here we report on emigration patterns in Drosophila melanogaster behavior under laboratory conditions. For this study, a special apparatus was employed that includes a few important changes in its design and size compared with other known systems.

[Aspartame--the sweet-tasting dipeptide--does not affect the pancreatic insulin-secreting function].

The action of a synthetic dipeptide aspartam (150 to 180 times as sweet as glucose) on pancreatic insulin-secretory function of rats was studied in vivo and in vitro. The drug was given orally while drinking (300 mg/kg body weight) or was added to the incubation medium of cultivated pancreatic cells (20 mM). It was shown that insulin content in the rat blood serum remained unchanged 10 and 35 minutes after aspartam administration.