Nest predation can greatly affect reproductive success of waterfowl. We studied factors influencing duck-nest predation near Humboldt Bay in northern California by testing the prediction that measurements of nest concealment and nest location should differ between successful and depredated artificial nests. We ran a priori hypothesized logistic regression models to evaluate the effects of nest ...

In this issue of Structure, Beale et al. (2015) define structurally and functionally a large extracellular domain unique to mammalian peptide transporters and its implications for the transport of basic di- and tri-peptides (Beale et al., 2015).

The leaves of Phaseolus vulgaris L. cv Greensleeves contain an endopeptidase with a pH optimum of 9.0 and an isoelectric point between 10.0 and 10.5. This endopeptidase is the only abundant Azocoll-digesting proteinase in the leaves. The activity of this enzyme is highest in immature leaves and declines as the leaf matures and senesces. Enzymically isolated protoplasts contain very little of th...