Triterpenos de Guettarda grazielae M: R.V. Barbosa (Rubiaceae)

Barbosa A conversation with Frederico Simões Barbosa

- Luciano Barbosa

For the past ten years, I have worked on several problems related to finding and organizing Web data. From 1999 to 2002, I was a lead developer for Radix, one of the first Brazilian search engines. During my Masters, I designed and implemented a Web crawling policy that uses classification techniques to efficiently update a search engine index while maximizing its freshness [11]. After finishin...

Chemical Constituents from Fadogia homblei De Wild (Rubiaceae)

The total of fourteen known compounds was isolated from the fruits, leaf and stem of Fadogia homblei De Wild. (Rubiaceae) and identified as: a coumarin, 7-hydroxy-6-methoxy-2H-1benzopyran-2-one (scopoletin) 1, two flavones; 3′,4′,5,7-tetrahydroxyflavone (luteolin) 2 and quercetin-3-O-β-D-galactoside 3, four lupane triterpenoids; lupeol 4, betulinic acid 5, 3βdodecanoyllup-20(29)-en-28-al 6, lup...

M 31 - RV evolution and its alleged multi - outburst pattern ⋆

The photometric evolution of M31-RV has been investigated on 1447 plates of the Andromeda galaxy obtained over half a century with the Asiago telescopes. M31-RV is a gigantic stellar explosion that occurred during 1988 in the Bulge of M31 and that was characterized by the appearance for a few months of an M supergiant reaching Mbol = −10. The 1988 outburst has been positively detected on Asiago...

Mon and M 31 - RV : The Stellar Populations Angle

Insight into the origin of unusual events like the eruption of V838 Mon can be obtained from studies of the stellar populations from which they arise. V838 Mon lies in an intriguing region of the Galaxy, toward the warped outer edge of the disk, with significant contributions from the Galactic thick disk and the recently discovered Monoceros tidal stream. The initial distance measures placed V8...