It is well recognized that host-specialized folivores prefer to feed on young in comparison to old leaves. However, the capacity of young leaf feeders to track speciÞc leaf developmental stages has not been clearly demonstrated. Using three insect folivores and two plant species, we show that nitrogen (N) fertilization changes leaf development and that herbivores track these changes in leaf dev...

For any fixed graph H, an H-linear family of graphs is a sequence { G,,)z= i of graphs in which G, consists of n copies of H that have been linked in a consistent manner so as to form a chain. Generating functions for the region distribution of any such family are found. It is also shown that the minimum genus and the average genus of G, are essentially linear functions ofn.

The title compound, C(14)H(15)BrN(2)O(2), an inter-mediate in drug discovery, was synthesized by the reaction of 5-bromo-pyridin-2-amine and 3,4-dimeth-oxy-benzaldehyde. In the crystal, molecules are linked via pairs ofN-H⋯N hydrogen bonds, leading to the formation of inversion dimers. A short contact occurs between the aryl H atom (ortho position from N) and the centroid of the benzene ring.

We extend the Myers dielectric effect to configurations with angular momentum. The resulting time-dependent N D0 brane bound state can be interpreted as a rotating fuzzy ellipsoid. A similar solution exists also in the presence of a RR magnetic field, that we study in detail. We show that, for any finite N , above a certain critical angular momentum is energetically more favorable for the bound...