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Search Results: 1 - 10 of 197679 matches for " Protasio Ferreira e Castro "
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Aproveitamento da cinza do baga o de cana-de a úcar como fíler em concreto asfáltico
Cláudio Luiz Dias Leal,Protasio Ferreira e Castro
Vértices , 2010,
Abstract: A gera o, o manuseio e o armazenamento seguro de resíduos sólidos têm se tornado uma grande preocupa o no Brasil. O principal objetivo desse estudo foi investigar a potencialidade do uso da cinza do baga o de cana de a úcar como fíler em misturas asfálticas. O comportamento das misturas foi caracterizado por meio de um programa experimental utilizando diferentes teores de resíduo e os ensaios de estabilidade Marshall, tra o indireta, módulo de resiliência e velocidade do pulso ultra-s nico. A análise estatística aplicada aos resultados dos ensaios mostrou que a cinza do baga o de cana pode ser usada como fíler em misturas betuminosas. Applying sugar cane pulp ashes as filler to asphalt concrete The generation, handling and safe disposal of solid wastes has become a major concern in Brazil. The primary objective of this study was to investigate the feasibility of using sugar cane pulp ashes as filler to asphalt mixtures. The mixture’s behavior was characterized through an experimental program consisting of different industrial waste content and several test methods: Marshall stability, diametral indirect tensile test, resilient modulus and ultrasonic pulse velocity. Statistical analyses applied to the test results showed that sugar cane pulp ashes can be used as filler in bituminous mixes.
Cláudia Barroso Vasconcellos,Cláudio Luiz Dias Leal,Marcelo Pereira Fran?a,Protasio Ferreira e Castro
Vértices , 2010,
Abstract: Esse trabalho apresenta um estudo do potencial de aproveitamento de cinza de caldeira. No Brasil, o volume desse resíduo industrial tem aumentado significativamente devido à implementa o da política de fontes geradoras de energia elétrica, que enfatiza o uso de usinas termelétricas e mais especificamente a aplica o do gás natural. O programa experimental foi desenvolvido por meio da aplica o de cinza em misturas asfálticas e em argamassas de cimento Portland. A análise estatística dos resultados dos ensaios permite afirmar que a cinza de caldeira possui potencial para ser aplicada em misturas de cimento asfáltico de petróleo e de cimento Portland.
Genetic transformation of coffee
Ribas, Alessandra Ferreira;Pereira, Luiz Filipe Protasio;Vieira, Luiz Gonzaga E.;
Brazilian Journal of Plant Physiology , 2006, DOI: 10.1590/S1677-04202006000100007
Abstract: in the last 15 years, considerable advances were made in coffee genetic transformation. different research groups in the world have been able to transform coffee with genes for insect resistance, decaffeinated coffee, herbicide resistance and control of fruit maturation. although the majority of the research is still limited to laboratory and greenhouse studies, initial field tests with transformed coffee are beginning to appear in the literature. in this review we provide an update on the state of coffee genetic transformation, presenting technical aspects related to tissue culture systems, strategies for selection and transformation with particle bombardment, as well as the use of agrobacterium tumefaciens. we also discuss the potential applications of this technology, taking into consideration the benefits, the possible environmental risks, as well as market and consumer issues.
Barras de FRP: avaliando o módulo de elasticidade n?o destrutivamente
Castro, Protasio F;
Polímeros , 1997, DOI: 10.1590/S0104-14281997000200008
Abstract: an experimental study was carried out to support the development of standards test methods for fiber reinforced plastic (frp) bars used as concrete reinforcement. in addition, this study compares the elastic modulus values from tensile stress-strain curves with the dynamic values obtained nondestructively. dynamic modulus of elasticity was determined using two stress wave propagation methods: ultrasonic pulse velocity and resonant frequency. the dynamic values compared favorably with values obtained from tensile stress-strain curves. the results showed the feasibility of using nondestructive methods, as control test, to estimate frp bars elastic modulus in a manufacture process.
A Method For Fitting A pRARMAX Model: An Application To Financial Data
Marta Ferreira,Luisa Canto e Castro
Lecture Notes in Engineering and Computer Science , 2010,
Residues of the Cork Industry as Carriers for the Production of Legume Inoculants
Ferreira,Eugénio Mendes; Castro,Isabel Videira e;
Silva Lusitana , 2005,
Abstract: growth and survival of two rhizobial strains, rhizobium leguminosarum bv. trifolii, and mesorhizobium ciceri, were used to evaluate residues from the cork industry as potential carriers for production of rhizobial inoculants. a peat-based carrier was used as a control. 41 days after inoculation, the number of viable bacteria was high, about 109 bacteria g-1 for all carriers. rhizobial survival during storage (450 days) remained stable, between 108 and 109. the cork residues based carriers showed good handling properties and water holding capacities, they were non-toxic and had a nearly neutral ph. all these factors indicate that the use of these carriers is viable for the production of rhizobial inoculants.
Central lead administration inhibits water intake and sodium appetite in rats
De-Castro-e-Silva E.J.,Castro L.,Luz C.P.,Ferreira H.
Brazilian Journal of Medical and Biological Research , 1999,
Abstract: We have demonstrated that acute third ventricle injections of lead acetate (PbAc) exert a powerful antidipsogenic effect and induce a significant increase in renal sodium excretion. In the present study we confirm the antidipsogenic effect of lead and demonstrate that central administration of this metal, in minute amounts, significantly reduces salt intake both during dehydration and after central angiotensinergic stimulation. Adult male Wistar rats had the third ventricle cannulated seven days before the experiments. During this period they had free access to distilled water and hypertonic saline solution (1.5%). After a 24-h period of fluid deprivation, experimental animals received third ventricle injections of PbAc (0.3, N = 8 and 3.0 nmol/rat, N = 14) while controls received sodium acetate (NaAc; 3.0 nmol/rat, N = 10). Rats treated with PbAc at the highest dose showed a significant reduction (P<0.05) both in water and hypertonic saline intake when compared to controls. When the effect of lead administration on angiotensin II-induced water and salt intake was studied, normohydrated animals received third ventricle injections of angiotensin II (9.6 nmol/rat) after pretreatment with 3.0 nmol/rat of PbAc (experimental group, N = 10) or NaAc (controls, N = 8). The group pretreated with PbAc presented a significant reduction (P<0.05) in both water and salt intake compared to controls. Thus, this study confirms the antidipsogenic effect of central lead injections and demonstrates that the presence of lead in the brain exerts a significant inhibition of sodium appetite.
The effect of laser on remanescent liver tissue after 90% hepatectomy in rats
Oliveira, Alexandre Ferreira;Castro e Silva, Tiago;Sankarankutty, Ajith Kumar;Pacheco, Eduardo Garcia;Ferreira, Juliana;Bagnato, Vanderlei Salvador;Zucoloto, Sergio;Castro e Silva, Orlando de;
Acta Cirurgica Brasileira , 2006, DOI: 10.1590/S0102-86502006000700007
Abstract: purpose: to evaluate the effect of laser beam on remanescent liver after partial hepatectomy 90%. methods: wistar rats, (n= 42), were divided into six groups with seven specimens each. the partial hepatectomy (hp) was performed in all animals through exeresis of approximately 90% of the liver parenchyma. the animals from groups hp and laser application, hpl24, hpl48 and hpl72 undertook laser irradiation carried out through application (dose of 22.5 j/cm2) in five different sites in the remanescent liver. the rats were then sacrificed 24, 48 and 72hours after hp procedure, for the liver regeneration analysis,using the proliferating cell nuclear antigen (pcna),and for dosage of serum aminotransferases. results: were demonstrated an increase of the serum levels of alanine aminotransferase for the group of 24 hours and a decrease for the group of 72 hours exposed to laser. the index of marked cells had a considerable more improvement for the group of 72 hours exposed in laser compared to other groups. conclusion: laser did not cause hepatic injuries additional to the partial hepatectomy and perhaps led to a benefit by stimulating the proliferative activity.
Knowledge and concealment: the historiographical discourse on euro-brazilian colonization and ethnic otherness in southwest Paraná (Brazil)
Protasio Langer
Diálogos , 2010, DOI: 10.4025/dialogos.v11i3.53
Abstract: The present article proposes an analysis of the historiographical speech on the native people who, during the 1040s and 1050s, were confronted by the flow of southern colonization, in southwestern Paraná. We will analyze, therefore, the clichés and the postulates that permeate academic knowledge and are corroborated by the hiding and depreciation of the indigenous groups and caboclos involved in the intense transformations caused by the expansion in colonial space by incoming Euro-Brazilian families from the states of Rio Grande do Sul and Santa Catarina. El presente artículo propone un análisis del discurso historiográfico sobre las etnias nativas del Suroeste del Estado de Paraná que, en las décadas de 1940 y 1950, se depararon con el flujo de colonización oriunda del Sur del Brasil. Por lo tanto, analizaremos los postulados e ideas perogrulladas que envuelven el conocimiento académico y que corroboran el ocultamiento y el desprecio de grupos indígenas y de caboclos, involucrados en las intensas transformaciones ocurridas con la expansión del espacio colonial, promovida por familias euro-brasile as, oriundas de Río Grande do Sul y de Santa Catarina. O presente artigo prop e uma análise do discurso historiográfico sobre as etnias nativas que, nas décadas de 40 e 50 do século XX, se defrontaram com o fluxo de coloniza o sulista no Sudoeste do Paraná. Analisaremos, portanto, os clichês e os postulados que permeiam o conhecimento acadêmico e corroboram o ocultamento e a deprecia o de grupos indígenas e de caboclos envolvidos nas intensas transforma es instauradas pela expans o do espa o colonial movido por famílias eurobrasileiras procedentes do Rio Grande do Sul e de Santa Catarina.
Production of herbicide-resistant coffee plants (Coffea canephora P.) via Agrobacterium tumefaciens-mediated transformation
Ribas, Alessandra Ferreira;Kobayashi, Adilson Kenji;Pereira, Luiz Filipe Protasio;Vieira, Luiz Gonzaga Esteves;
Brazilian Archives of Biology and Technology , 2006, DOI: 10.1590/S1516-89132006000100002
Abstract: transgenic plants of coffea canephora p. resistant to the herbicide ammonium glufosinate were regenerated from leaf explants after co-culture with agrobacterium tumefaciens strain eha105 harboring pcambia3301, a plasmid that contains the bar and the uida genes both under control of 35s promoter. direct somatic embryogenesis was induced on basal medium contained ? strength macro salts and half strength micro salts of ms medium, organic constituents of b5 medium and 30 g.l-1 sucrose supplemented with 5μm n6 - (2-isopentenyl)-adenine (2-ip). ten μm ammonium glufosinate was used for putative transgenic somatic embryos selection. presence and integration of the bar gene were confirmed by pcr and southern blot analysis. selected transgenic coffee plants sprayed with up to 1600 mg.l-1 of finale?, a herbicide containing glufosinate as the active ingredient, retained their pigmentation and continued to grow normally during ex vitro acclimation.
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