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Opto-Electronic Properties of Fluorene-Based Derivatives as Precursors for Ligh...
Fratiloiu, Silvia; Fonseca, Sofia M.; Grozema, Ferdinand C.; Burrows, Hugh D.; Costa, Maria L.; Charas, Ana; Morgado, Jorge; Siebbeles, Laurens D. A.This paper reports optical absorption spectra of oxidized fluorene copolymers obtained by chemical oxidation with Ce(IV) and by pulse radiolysis experiments in chlorinated solvents. Comparison of the results observed by the two techniques is used to provide spectral data on the copolymer radical ions and information on stability of the oxidized species. In addition, a detailed quantum chemical characterization ...
Influence of internal seedborne Fusarium semitectum on cotton seedlings
Costa,Maria L. N.; Dhingra,Onkar D.; Silva,Janaina L. daFusarium semitectum was found to be the major seed colonizing fungus in the commercial acid delinted cotton (Gossypium hirsutum) seed lots. There was no correlation, however, between its incidence and seedling emergence and disease symptoms on the emerged seedlings in autoclaved sand. Inoculation technique simulating internally seedborne nature of the fungus showed that the observed non-correlation might be rel...
Essential oil of mustard to control Rhizoctonia solani causing seedling damping...
Dhingra,Onkar D.; Costa,Maria L. N.; Silva, Jr.,Geraldo J.; Mizubuti,Eduardo S. G.The essential oil extracted from mustard (Brassica rapa) seeds was evaluated for its effect on suppression of Rhizoctonia solani growth in vitro, and in field soils, for reducing saprophytic substrate colonization and seedling damping off and blight using snap beans as indicator plant, the in vitro growth was completely inhibited at a concentration of 50 mul/l. The saprophytic substrate colonization in soils 24...
Effect of stereoisomers of the main component of the sex pheromone of Euschistu...
Costa,Maria L.M.; Borges,Miguel; Vilela,Evaldo F.; Marco Jr,Paulo de; Lima,Eraldo R.The attractiveness of Euschistus heros (F.) (Hemiptera: Pentatomidae) females to the eight stereoisomers of the methyl 2,6,10-trimethyltridecanoate, major component of the sex pheromone produced by the males of this species, was studied in a double choice olfactometer. Bioassays showed that the (2R, 6R, 10S) stereoisomer was necessary for the attractiveness of females, presenting better results in relation to t...
Biologia reprodutiva de Euschistus heros (F.) (Heteroptera: Pentatomidae)
Costa,Maria L.M.; Borges,Miguel; Vilela,Evaldo F.Estudou-se a biologia de Euschistus heros (F.) (Heteroptera: Pentatomidae) em laboratório sob 24±0,5ºC, 70±10% UR e fotofase de 14 h. O tempo médio de desenvolvimento até adulto foi de 38,6 d, sendo o 2º estádio ninfal, o de maior índice de mortalidade (10,4%). A longevidade de E. heros variou de acordo com o sexo e atividade sexual. Machos e fêmeas atingiram a maturidade sexual com 11,4 e 11,2 d, respectivamen...
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