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Search Results: 1 - 10 of 486037 matches for " Sérgio R. Ambrosio "
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Hyphal Morphology and Elongation Alterations in Aspergillus nidulans Provoked by the Diterpene Kaurenoic Acid  [PDF]
Janice A. Rafael, Nilton S. Arakawa, Sérgio R. Ambrosio, Fernando B. Da Costa, Suraia Said
Advances in Microbiology (AiM) , 2013, DOI: 10.4236/aim.2013.35059
Abstract:

Kaurenoic acid (KA), a kaurane-type diterpene extracted from leaves of Mikania hirsutissima, was previously reported as an inhibitor of vascular contractility mainly by blocking extracellular Ca2+ influx. The compound is known for several other biological activities such as antiparasitic, antispasmodic and antibacterial activity. The aim of the present study was to investigate the effect of KA on Aspergillus nidulans. KA (0.3 mM) showed fungistatic activity against A. nidulans with visible hyphal elongation and morphology damage. These effects were reverted by CaCl2 addition showing that KA interferes with intracellular Ca2+ gradient in A. nidulans. This is the first report on the mechanism of action of KA involving calcium levels by altering the elongation of fungi hyphae.

Contribui??o ao estudo da circula??o e do transporte de volume da corrente do Brasil entre o Cabo de S?o Tomé e a Baía de Guanabara
Signorini, Sérgio R.;
Boletim do Instituto Oceanográfico , 1976, DOI: 10.1590/S0373-55241976000200002
Abstract: during the periods of april, july, 1970 and july, 1973, océanographic cruises were conducted in order to investigate the variability of the brazil current in the region between cabo de sao tomé and guanabara bay. the geostrophic model of ocean circulation was applied using the hydrographie data collected during the cruise. from this study, a maximum velocity of 70 cm/sec and a volume trans port of 14 x 106 m3/sec were reported. the dynamic topography with reference to the 500 db surface, showed the presence of anticyclonic eddies during the periods of april, 1970, and july, 1973. the thermohaline structure within a meander of the brazil current is also presented utilizing the data coming from a continuous salinity and temperature recorder in conection with the data coming from a simultaneous bt section.
Contribui??o ao estudo da circula??o e do transporte de volume da corrente do Brasil entre o Cabo de S?o Tomé e a Baía de Guanabara
Signorini, Sérgio R;
Brazilian Journal of Oceanography , 1976, DOI: 10.1590/S1679-87591976000200002
Abstract: during the periods of april, july, 1970 and july, 1973, océanographic cruises were conducted in order to investigate the variability of the brazil current in the region between cabo de sao tomé and guanabara bay. the geostrophic model of ocean circulation was applied using the hydrographie data collected during the cruise. from this study, a maximum velocity of 70 cm/sec and a volume trans port of 14 x 106 m3/sec were reported. the dynamic topography with reference to the 500 db surface, showed the presence of anticyclonic eddies during the periods of april, 1970, and july, 1973. the thermohaline structure within a meander of the brazil current is also presented utilizing the data coming from a continuous salinity and temperature recorder in conection with the data coming from a simultaneous bt section.
Editorial
Sérgio R. Barra
Soldagem & Inspe??o , 2010, DOI: 10.1590/s0104-92242010000400001
Abstract:
Sistema de Informa es de Gerenciamento Costeiro
Mauro Sérgio R. Argento
Anuário do Instituto de Geociências , 1988,
Abstract:
Adenoma alveolar
Saito, Eduardo Haruo;Aaraujo, Luciana Ribeiro de;Carneiro, Leonardo Hoehl;Oliveira Neto, Antonio Ambrosio de;Correa, Jo?o Carlos;Teixeira, Luiz Sérgio Carvalho;
Jornal Brasileiro de Pneumologia , 2006, DOI: 10.1590/S1806-37132006000300014
Abstract: alveolar adenoma is a rare benign neoplasm of the lungs, and very few cases have been described in the literature. patients with alveolar adenoma are frequently asymptomatic and are diagnosed through the accidental discovery of a singular, well-delineated nodule on a routine chest x-ray. the definitive diagnosis is made histologically, and the treatment consists of surgical resection of the nodule.
"Tá lá o corpo estendido no ch?o...": a violência letal contra travestis no município do Rio de Janeiro
Carrara, Sérgio;Vianna, Adriana R. B.;
Physis: Revista de Saúde Coletiva , 2006, DOI: 10.1590/S0103-73312006000200006
Abstract: based on a broad research on lethal violence which affects gays and travestis, and the way such cases are judicially built, this paper aims to highlight some important elements to help understand the social dynamics played when travestis are the victims. the victims' social profile, the distinctive characteristics of the crimes and, most of all, the peculiarities of the police's and the judiciary's behavior point to the need for investigating colorings and nuances of homophobic violence. the analyzed judicial processes clearly show that color, class and gender relations play an important role in the way such violence occurs, is socially codified and, finally, is punished.
Utiliza??o do método TDR-tensi?metro na obten??o da curva de reten??o de água no solo
Otto, Sérgio R. L.;Alcaide, Miguel;
Revista Brasileira de Engenharia Agrícola e Ambiental , 2001, DOI: 10.1590/S1415-43662001000200015
Abstract: tdr (time domain reflectometry) and tensiometer methods were used to obtain soil water retention curve. several soil water retention curves of a sandy loam soil were determined in both laboratory and field conditions from sieved and undisturbed soil using a tdr-tensiometer and richard's pressure plate apparatus. the values of soil water content determined by tdr-tensiometer were smaller than those achieved by richard's pressure plate. the tdr's data of the soil water content for this sandy loam soil require specific correction.
Análise filogenética e implica??es sistemáticas e evolutivas nos Cuculiformes (Aves) com base na osteologia, comportamento e ecologia
Posso, Sérgio R.;Donatelli, Reginaldo J.;
Revista Brasileira de Zoologia , 2006, DOI: 10.1590/S0101-81752006000300003
Abstract: despite of many recent cladistic studies the classification of the order cuculiformes is still controversial. thus, we performed the most extensive cladistic analysis of the cuckoos, inferred based on 250 characters of the osteology, behavior and ecology. the resulting analysis provided 18 equally parsimonious trees (768 steps, ci = 0.4779, ri = 0.8080 and cri = 0.3861). according to the topology of the strict consensus cladogram: a) the monophyly of cuculiformes order is corroborated; b) the order is divided in two groups: a) coua/carpococcyx and b) others cuckoos (neomorphidae, (crotophagidae, (tapera/dromoccoccyx, (cuculidae))), being the systematic position of centropus ambiguous between these two groups; c) the terrestrial cuckoos are considered basal and a paraphyletic group and the arboreal cuckoos are derived and monophyletic; d) brood parasitism evolved twice in the cuckoos (in tapera/dromoccoccyx and in cuculidae).
Biogeography on the early distribution of cuckoos (Aves: Cuculiformes)
Posso, Sérgio R.;Donatelli, Reginaldo J.;
Zoologia (Curitiba) , 2012, DOI: 10.1590/S1984-46702012000300001
Abstract: cuckoos are widely distributed, but are concentrated in the tropics, where they occupy a wide range of habitats. both terrestrial and arboreal behaviors can be found in this group, but there is no consensus on as to whether these behaviors have arisen more than once. moreover, the historical distribution of cuckoos is poorly understood. this paper presents a biogeographyc analysis of the early history of the distribution of these birds. the analysis was performed by using the principle of parsimony based on primary and secondary "brooks parsimony analysis" (bpa). despite some exceptions, the primary bpa corroborated events of vicariance (general pattern) in the early distribution of cuckoos and a terrestrial ancestor widespread in the gondwana. the most parsimonious hypothesis suggests that the distribution of terrestrial cuckoos (basal group) is associated with the break-up of the gondwana (early to mid cretaceous), consistent with molecular data for other living birds. on the other hand, the fossil records indicate a more recent origin (paleocene to upper tertiary) in the laurasia. nevertheless, to corroborate the fossil records, the early distribution of cuckoos would not be explained by parsimony, since additional steps on dispersion and local extinctions should be added. in addition, according to the secondary bpa, most exceptions can be explained by dispersion as the origin of the arboreal cuckoos (derived group) in south america, where they dispersed to other continents.
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