Juan Carmona

Cissampeloflavone, a chalcone-flavone dimer from Cissampelos pareira

From the aerial parts of Cissampelos pareira L. (Menispermaceae), a chalcone-flavone dimer has been isolated which, mainly from NMR spectroscopic and MS data, was proved to be 2-(4-hydroxy-3-methoxyphenyl)-7-(4-methoxyphenyl)-6-(2-hydroxy-4,6-dimethoxybenzoyl)-furano[3,2-g]benzopyran-4-one. This has been assigned the trivial name cissampeloflavone. The compound has good activity against Trypanosoma cruzi and T. brucei rhodesiense and has a low toxicity to the human KB cell line.

Forking geometry on theories with an independent predicate

We prove that a simple theory of SU-rank 1 is n-ample if and only if the associated theory equipped with a predicate for an independent dense subset is n-ample for n at least 2.

Chemical Composition of the Essential Oil of Croton huberi Steyerm. (Euphorbiaceae) Collected from Tachira-Venezuela

Abstract GC and GC-MS analyses of Croton huberi essential oil showed the presence of fourteen compounds, with the major ones being β-caryophyllene (18.3 %) and germacrene-D (16.1 %) while valencene (8.3 %), caryophyllene oxide (7.3 %), bicycle-germacrene (7.1 %) and τ-muurolol (6.1 %) were observed in lower amounts. The oil was characterized by a high percentage of sesquiterpene hydrocarbons 65 %, whereas oxygenated sesquiterpenes represented 21 % and oxygenated monterpenes and diterpenes only 14 % of the total oil.