It is known that unions of acyclic conjunctive queries (CQs) can be evaluated in linear time, as opposed to arbitrary CQs, for which the evaluation problem is NP-complete. It follows from techniques in the area of ...

It is known that unions of acyclic conjunctive queries (CQs) can be evaluated in linear time, as opposed to arbitrary CQs, for which the evaluation problem is NP-complete. It follows from techniques in the area of ...

Acyclic nucleosides are potential antiviral and antitumor agents. In this work, their preparation through a novel chemoenzymatic procedure involving theN-alkylation of a nucleobase and subsequent aldol condensation catalyzed ...

Two new acyclic diterpenoids, smaditerpenic acid E (1a) and F (2a), along with nineteen melampolide-type sesquiterpene lactones, six of them not previously reported in yacon, were isolated from the methylene chloride leaf ...

We propose to study a problem that arises naturally from both TopologicalNumbering of Directed Acyclic Graphs, and Additive Coloring (also knownas Lucky Labeling). LetDbe a digraph andfa labeling of its verticeswith positive ...

Alterations in the hypothalamic-pituitary-gonadal axis in females determine the transition from regular to irregular reproductive cycles, with loss of fertility. Stimulation of noradrenergic neurons of the anteroventral ...

The absence of simultaneous cycles is a sufficient condition for the existence of singleton cores. Acyclicity in the preferences of either side of the market is a minimal condition that guarantees the existence of singleton ...