4 documents found, page 1 of 1
Inhibition of the symbiotic fungus of leaf-cutting ants by coumarins
Godoy,Marizete F. P.; Victor,Sandra R.; Bellini,Adriana M.; Guerreiro,Gisleine; Rocha,Waldireny C.; Bueno,Odair C.; Hebling,Maria J. A.Leaf-cutting ants are known to be a serious pest for agriculture due to the high amounts of vegetal matter from crops used by them in order to cultivate a symbiotic fungus on which they rely for food and enzymes. The mutualism between the fungus and the ants is a point to be explored when alternative methods of control are being thought of. Considering that some plants are naturally resistant to phytophagous in...
Extrações de óleos de sementes de citros e suas atividades sobre a formiga cort...
Fernandes,João B.; David,Valmir; Facchini,Patrícia H.; Silva,M. Fátima das G. F. da; Rodrigues Filho,Edson; Vieira,Paulo C.; Galhiane,Mário S.Seeds Citrus oils (C. sinensis, C. limon and C. reticulata) extraction with hexane in a soxhlet apparatus and through supercritical fluid (CO2) were done. Besides triglycerides, the oils obtained with hexane comprised volatile compounds such as terpenes and fatty alcohols, esters, and aldehydes. However, the oils obtained by extraction with supercritical fluid presented only triglycerides. These results indicat...
Biological Activity of Quinoline Alkaloids from Raulinoa echinata and X-ray Str...
Biavatti,Maique W.; Vieira,Paulo C.; Silva,M. Fátima das G. F. da; Fernandes,João B.; Victor,Sandra R.; Pagnocca,Fernando C.; Albuquerque,SérgioPhytochemical survey of stems and leaves extracts of the South Brazilian endemic plant Raulinoa echinata Cowan, Rutaceae, led to the isolation of known furoquinoline alkaloids: the widespread skimmianine; kokusaginine, maculine, flindersiamine, and also quinolone derivatives: 1-methyl-2-n-nonyl-4-quinolone, 2-n-nonyl-4-quinolone and 1-methyl-2-phenyl-4-quinolone. These alkaloids showed antifungal activity again...
Triterpene benzoates from the bark of Picramnia teapensis (Simaroubaceae)
Rodríguez-Gamboa,Tatiana; Fernandes,João B.; Rodrigues Filho,Edson; Silva,M. Fátima das G. F. da; Vieira,Paulo C.; Barrios Ch.,MarianoTwo new benzoic acid esters of triterpene alcohols [lup-20(29)-en-28-oic acid 3alpha,7beta-dibenzoate and 3alpha-hydroxy-lup-20(29)-en-28-oic acid 7beta-benzoate] were isolated from the stem bark of Picramnia teapensis Tul. The structures of these compounds were established on the basis of spectral analyses. Other known compounds, beta-sitosterol, estigmasterol, lupeol and epilupeol, were identified in mixture ...