In this article, some results of numerical prediction of binary tropical cyclones (or binary systems) paths are presented. The analyzed systems were produced between 1984 and 2005, southward of 20 North latitude on northeastern Pacific Ocean adjacent to Mexico. In this zone, it is common that tropical cyclones be accompanied by cloud clusters or another tropical cyclone that might be a mesoscale convective system, (MCS), a tropical depression, a tropical storm or a hurricane, establishing an interaction that is able to affect their typical tracks. When simulating a binary system in this work, the ability of the model to predict the path of this kind of tropical cyclones was improved. In all cases, western coast of Mexico was affected by this kind of systems.

The larval stages of Battus archidamas, the only Papilionoid butterfly living in Chile, feed on the aerial parts of Aristolochia chilensis. The food material contains aristolochic acids, and so do the insects, which retain these compounds after metamorphosis. The compositions of the acid fractions of plant and herbivore extracts are different, however, indicating selective uptake and/or metabolic transformation by the insect. Aristolochic acids I (I) and Ia (II) are major components of the leaves and tender stems of A. chilensis, while aristolochic acids I (I) and (probably) IVa (III) appear to be the main acid components of B. archidamas imagines. The selective sequestration of aristolochic acids by B. archidamas and other Aristolochia-feeders is discussed.

The major components of the acid fraction of the leaves and tender stems of Aristolochia chilensis Miers are aristolochic acids I and Ia. Aristolochic acid Ia has been isolated from plant material for the fïrst time, and its PMR spectrum is discussed.