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Instituto de Biologia Unicamp
Abstracta 2002







Artigos Publicados em Periódicos

Nitric oxide synthase-mediated phytoalexin accumulation in soybean cotyledons in response to the Diaporthe phaseolorum f. sp. meridionalis elicitor
Modolo L V, Cunha F Q, Braga M R, Salgado I*
Phytoalexin biosynthesis is part of the defense mechanism of soybean plants against attack by the fungus Diaporthe phaseolorum f. sp. meridionalis (Dpm). The treatment of soybean cotyledons with Dpm elicitor or with sodium nitroprusside (SNP), a NO donor, resulted in a high accumulation of phytoalexins. Phytoalexin accumulation induced by the fungal elicitor, but not by SNP, was prevented when cotyledons were pretreated with NOS inhibitors. NOS activity was not observed in SNP-elicited tissues. An antibody to brain NOS labeled a 166 kDa protein in elicited and non-elicited cotyledons. Daidzein, genistein, glyceollins, apigenin and luteolin were identified following exposure to the elicitor or SNP, although the accumulation of glyceollins and apigenin was limited in SNP- compared to fungal-elicited cotyledons. The results indicate that the response of soybean cotyledons to Dpm involves NO formation via a NOS-like enzyme that triggers the biosynthesis of anti-microbial flavonoids.
Plant Physiology 130: 1288-1297, 2002. IF = 5.105
* E-mail:

P002-02 Participation of the mitochoncrial permeability transition pore in nitric oxide-induced plant cell death
Saviani EE, Orsi SH, Oliveira JFP, Pinto-Maglio CAF, Salgado I*
FEBS Letters 510: 136-140, 2002. IF = 3.644 (Idem A024-01)
* E-mail:

P003-02 Parallels between plants and animals in the production and molecular targets of nitric oxide
Salgado I*, Modolo LV, Ribeiro JN, Magalhães JR, Tamashiro WMSC
Physiology and Molecular Biology of Plants 8: 185-191, 2002. (idem A022-01)

P004-02 Nitric oxide and nitrate reductase in higher plants
Magalhães JR, Silva FLIM, Salgado I*, Filho OF, Rockel P, Kaise WM
Physiology and Molecular Biology of Plants 8: 11-17, 2002. (idem A023-01)

P005-02 Foraging ecology of the giant Amazonian ant Dinoponera gigantea (Hymenoptera, Formicidae, Ponerinae): activity schedule, diet, and spatial foraging patterns
Fourcassié V, Oliveira PS*
We provide an account of the foraging biology of the ponerine ant Dinoponera gigantea in a rainforest in N Brazil. The species nests on the ground and the colonies contain 70-96 workers. Ant activity is negatively correlated with temperature, and is more intense at dawn and dusk. Workers collect seeds and fruits, and hunt for live prey as well as scavenge for dead animal matter. The dry weight of food items ranges from < 10 mg (spiders, insect parts) to > 400 mg (seeds, fruits). No nestmate recruitment exists during the search for or retrieval of food. Foragers have a high directional fidelity, and ants from neighbouring colonies may engage in a ritualised territorial contests at the border of their foraging areas. The foraging ecology of D. gigantea when compared with other ponerine species living in tropical forests, and with other ant groups showed similar behavioural patterns.
Journal of Natural History 36: 2211-2227, 2002. IF = 0.619
*E-mail : *

P006-02 Ants affect the distribution and performance of Clusia criuva seedlings, a primarily bird-dispersed rainforest tree
Passos L, Oliveira PS*
We studied the dispersal system of the tree Clusia criuva (Clusiaceae) in a tropical rainforest in SE Brazil. Clusia trees produce hundreds of capsules with small lipid-rich arillate seeds. Birds (16 species) eat 83% of the diaspores on the tree, while the remaining 17% fall to the ground and are removed by ants (16 species). Ants remove 89% of the fallen diaspores and 98% of the seeds found in bird faeces. Aril removal by ants and removal of seeds from bird defecations increase germination success in C. criuva. Early seedling survival (1 yr) in nests of Pachycondyla striata is greater than in control areas. Soil samples from nests of P. striata also had higher concentrations of total nitrogen than random soil samples. This is the first study to demonstrate the combined effects of ants on the distribution and survival of seedlings of a primarily vertebrate-dispersed plant in a tropical forest.
Journal of Ecology 90: 517-528, 2002. IF = 2.291
*E-mail: *

P007-02 Alarm pheromone: a new function for the scent gland secretion in harvestmen (Arachnida: Opiliones)
Machado G, Bonato V, Oliveira PS*
We investigated the possible alarm effect of the defensive volatile secretions in the gregarious harvestman Goniosoma aff. proximum. Harvestmen aggregations were experimentally exposed in the field to a cotton swab soaked with the species’ gland exudate (treatment) or water (control). Results show that the gland secretion works as an alarm pheromone in Goniosoma such that 73.3% of the aggregations dispersed after being stimulated with the gland exudate, whereas 3.3% responded to the water control. Respondent groups are larger than non-respondent ones, and the time of reaction to the secretion was inversely related with group size. This is the first demonstration of a chemically-mediated alarm effect in harvestmen. The alarm response in gregarious harvestmen has possibly evolved as a by-product of a primarily defensive reaction under the context of predator avoidance.
Naturwissenschaften 89: 357-360, 2002. IF = 1.624
*E-mail: *

P008-02 A novel beta-globin variant : Hb Poços de Caldas [beta 61(E5)Lys-.>Gln]
Kimura EM, Jorge SB, Ogo SH*, Cesquini M, Albuquerque DM, Fattori A, Saad STO, Costa FF, Sonati MF
A novel hemoglobin (Hb) variant found during a screening program for hemoglobinopathies in blood donors at the Hematology Center of the State University of Campinas, Brazil is described. Corroborating the clinical manifestation, this hemoglobin showed functional properties similar to that of normal Hb.
Hemoglobin 26: 385-388, 2002. IF = 0.398

P009-02 Optical anisotropy of a pig tendon under compression
Feitosa VLC, Vidal BC*, Pimentel ER*
The distribution and organization of collagen bundles and proteoglycans in two portions of the proximal region of the superficial digital flexor tendon of pigs were studied under polarized light microscopy. The strong metachromasy observed in sp portion, which is in direct contact with the bone, demonstrated the presence of proteoglycan in a compression-bearing region, after toluidine blue staining. A higher molecular order of the collagen bundles as well as a more regular pattern of crimp in areas under tension, like in the dp region, probably attend a major requirement for tendon stretching. Linear dichroism phenomena confirmed that the glycosaminoglycans were disposed parallel to the long axis of the collagen bundles.
Journal of Anatomy 200: 105-111, 2002. IF = 1.397




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