Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99


Any time

2015 ( 1 )

2014 ( 2 )

2013 ( 10 )

2012 ( 23 )

Custom range...

Search Results: 1 - 10 of 298 matches for " Sidnei;Bacarin "
All listed articles are free for downloading (OA Articles)
Page 1 /298
Display every page Item
Varia??o do teor de carboidratos em genótipos de batata armazenados em diferentes temperaturas
Bervald, Clauber Mateus Priebe;Bacarin, Marcos Antonio;Deuner, Sidnei;Trevizol, Fabio Cristiano;
Bragantia , 2010, DOI: 10.1590/S0006-87052010000200027
Abstract: a major problem into storing potato tubers at low temperature is the sweetening (accumulation of reducing sugars). this accumulation leads to loss of commercial value of tubers when they are processed in the form of "chips". the objective of this study was to evaluate a possible change in carbohydrates levels of tubers. from different genotypes of potatoes before and after storage at 4 oc and 20 oc. the tubers were produced at embrapa clima temperado, pelotas (rs). shortly after the harvest samples were collected to determine levels of starch, sucrose, total soluble carbohydrates and reducing sugars. the remaining tubers were divided into two lots, standardized regarding to size and stored at 4 oc and 20 oc for 33 days, and after this period the same analysis described above were performed. the starch level was poorlyaffeuted by the storage conditions. were levels of reducing sugar and total soluble carbohydrates raised when the tubers were submitted to refrigeration, however with different rates of increment between the genotypes. as for the levels of sucrose, in general, a reduction was observed for both conditions of storage. pérola and clones c-1740-11-94 and c-1786-6-94 showed the lowest accumulation of soluble sugars when stored at low temperature.
Chlorophyll a fluorescence as indicative of the salt stress on Brassica napus L.
Bacarin, Marcos Antonio;Deuner, Sidnei;Silva, Fabio Sergio Paulino da;Cassol, Daniela;Silva, Diolina Moura;
Brazilian Journal of Plant Physiology , 2011, DOI: 10.1590/S1677-04202011000400001
Abstract: the effects of salinity stress on chlorophyll fluorescence and the growth of brassica napus l were investigated. the chlorophyll a fluorescence transient were recorded and analyzed according to the jip-test which can quantify psii performance. salt stress resulted in decreased leaf area and dry matter compared with the control treatment (0 mm nacl). the most pronounced effects of salt stress were observed with 200 mm nacl, and the hybrids displayed different levels of sensitivity to stress. the performance index (piabs) was the most sensitive parameter to salt stress, which suggests that this parameter can be used to screen genotypes for salt tolerance.
Atividade da invertase ácida solúvel e da insolúvel em tubérculos de batata recondicionados após o armazenamento sob diferentes temperaturas
Ferreira, Ladislau Soares;Deuner, Sidnei;Bacarin, Marcos Antonio;Bervald, Clauber Mateus Prieble;Zanatta, Eduardo Ricieri;
Ciência e Agrotecnologia , 2007, DOI: 10.1590/S1413-70542007000600002
Abstract: the aim of this work was to quantify the activity of the acid soluble invertase enzymes and insoluble invertase in tubers of potato genotypes: atlantic, pérola, asterix and c-1786-6-94 stored in different temperatures with recondition. one determined the activity of the acid soluble enzymes and insoluble invertase at 0 30 and 60 days of storage. in 30 days of storage the activity of the two enzymes was stimulated by the temperature at 4oc. the recondition from 4o c to 20o c reduced the activity of the insoluble and acid soluble invertase in all cultivars, however in different way among them. the storage at 12oc and the reconditioned from 12o c to 20o c had little influence on the activity of the acid soluble invertase. the activity of the insoluble invertase under 12o c was increased at 30 and 60 days of recondition in c-1786-6-94 clone and atlantic cultivar. the storage at 20oc did not alter the activity of the acid soluble invertase enzyme and insoluble invertase for the cultivars studied.
Carboidratos n?o estruturais em tubérculos de batata recondicionados após o armazenamento sob diferentes temperaturas
Bacarin, Marcos Antonio;Ferreira, Ladislau S.;Deuner, Sidnei;Bervald, Clauber Mateus P.;Zanatta, Eduardo R.;Lopes, Nei F.;
Horticultura Brasileira , 2005, DOI: 10.1590/S0102-05362005000300022
Abstract: the levels of total soluble carbohydrates and reducing sugars were quantified in tubers of potato genotypes (atlantic, pérola, asterix and c-1786-6-94) stored under different temperatures (4, 12 and 20oc) for 30 and 60 days and after a reconditioning period of 30 days of storage. before each harvest, the tubers were processed and divided in sub samples and then liofilizated. the liofilizated material was analyzed for total soluble carbohydrates and reducing sugars content. higher amounts of total soluble carbohydrates were found in the clone c-1786-6-94 before harvest. when stored during 30 days at 4oc all the genotypes presented an increase of the levels of total soluble carbohydrates and reducing sugars, with difference in the rates. the storage for more than 30 days at 4oc resulted in different response among genotypes. the storage at 12oc during 30 days increased the levels of sugars, and the storage during 60 days presented a tendency to decrease reducing sugars. in the reconditioning process under temperatures from 4 to 20oc occurred accentuated reduction in the level of reducing sugars and total soluble carbohydrates. the transfer from 12 to 20oc resulted in a strong lowering of the reducing sugar levels and total soluble carbohydrates. the storage at 20oc presented a small occasional flotation in the sugar levels, with tendency to decrease during the storage period.
Atividade antioxidante e viabilidade de sementes de girassol após estresse hídrico e salino
Carneiro, Marília Mércia Lima Carvalho;Deuner, Sidnei;Oliveira, Pablo Valad?o de;Teixeira, Sheila Bigolin;Sousa, Camila Pinho;Bacarin, Marcos Antonio;Moraes, Dario Munt de;
Revista Brasileira de Sementes , 2011, DOI: 10.1590/S0101-31222011000400017
Abstract: this study aimed to evaluate the effect of agents inducing water and saline stress on the seed germination and early growth and antioxidant activity in sunflower seedlings. sunflower seeds, cv. m735, were germinated on moistened paper in solutions with osmotic potentials of 0.0, -0.2, -0.4 and -0.8 mpa induced by peg 6000 and nacl. the germination test was conducted with four samples of 100 seeds and four replicates per treatment, in a germination chamber at 25 oc without light. we evaluated the final percentage and speed of germination index, and the initial growth and activity of antioxidant enzymes in sunflower seedlings. water stress induced by peg 6000 increased the percentage of seeds germinated in the potential of -0.2 mpa, on the other hand, for nacl in the potential of -0.8 mpa, there was a significant reduction. for this same potential, there was also a reduction in the rate of seed germination speed index in both conditioning agents. for the parameters of growth, shoot length decreased linearly with increasing concentrations of peg 6000 and nacl. as for the dry mass of leaves and roots and root length, this effect was more significant only in the potential of -0.8 mpa. the enzymes sod, apx and cat activity tended to be lower in seedlings originating from seeds in peg 6000. in the presence of nacl, the activity of sod in the leaves increased significantly in the three tested for potential witnesses. for apx and cat increase was observed at potentials of -0.2 and -0.4 mpa. in the roots there was no significant difference. an analysis of the evaluated parameters indicates that sunflower cv m735, under the conditions tested, showed tolerance to drought stress and salt until the potential of -0.4 mpa.
Observations on Forced Colony Emigration in Parachartergus fraternus (Hymenoptera: Vespidae: Epiponini): New Nest Site Marked with Sprayed Venom
Sidnei Mateus
Psyche , 2011, DOI: 10.1155/2011/157149
Abstract: Five cases of colony emigration induced by removal of nest envelope and combs and a single one by manipulation are described. The disturbance was followed by defensive patterns, buzz running, and adult dispersion. An odor trail created by abdomen dragging, probably depositing venom or Dufour's gland secretions, connected the original nest to the newly selected nesting place and guided the emigration. The substrate of the selected nesting place is intensely sprayed with venom prior to emigration, and this chemical cue marked the emigration end point. The colony moves to the new site in a diffuse cloud with no temporary clusters formed along the odor trail. At the original nest, scouts performed rapid gaster dragging and intense mouth contacts stimulating inactive individuals to depart. Males were unable to follow the swarm. Individual scouts switched between different behavioral tasks before and after colony emigration. Pulp collected from the old nest was reused at the new nest site. 1. Introduction According to Sonnentag and Jeanne [1], three organizational challenges must be faced when swarms disperse. The first is that a subset of the population, the scouts, must find and agree upon a suitable nest site. Second, the scouts induce the rest of the colony to leave for the new site. Finally, scouts guide the emigrating swarm to the new site. A division of labor during the swarming and new nest initiation also has been described [1–4]. West-Eberhard [5] described, for Epiponini, a pattern of aggregation called clumped swarms. These consist of temporary, compact clusters formed at intervals along the swarming route while searching for potential nesting sites. Clumped swarms have been described for Polybia ignobilis, P. raui, P. occidentalis, and Parachartergus apicalis [6]. According to Hunt et al. [7], Apoica pallens also forms temporary clusters during its emigration. Scent marking behavior is of great importance to signal the route followed by swarms. Jeanne [8, 9] experimentally confirmed Naumann’s conclusion [10] that swarming wasps follow a scent trail made by secretions of abdominal glands applied to surfaces. According to Howard et al. [11], Apoica pallens individuals were observed flexing their terminal gaster segments dorsally while clustering in leaves during an absconding event. This posture exposed the bases of the 5th and 6th sternites, suggesting that the wasps were releasing a pheromone from the sternal glands on these segments. In this way, they would communicate via aerial signaling, rather than by gaster dragging on substrate. Smith et
A Voca??o Sublime: da rela??o entre religi?o e sublima??o na defini??o da voca??o religiosa
Noé, Sidnei Vilmar;
Psicologia USP , 2010, DOI: 10.1590/S0103-65642010000100009
Abstract: this essay asks for the relation between the freudian concept of sublimation and his possible application for understanding of religion’s psychic importance by the constitution of religious vocation. the proposed hypothesis means that the defending mechanism of sublimation is responsible for the most part of the psychological relevancy of religion on the determination of the religious vocation.
Conserva o da natureza e turismo no Núcleo Picinguaba do Parque Estadual da Serra do Mar (SP)
Sidnei Raimundo
Revista Brasileira de Ecoturismo , 2008,
Abstract: Este artigo apresenta algumas características do entendimento da natureza pela sociedade ocidental e discute como o conceito de Unidades de Conserva o se insere nesse contexto. Com base no modelo adotado pelo Brasil para o manejo destas Unidades de Conserva o, s o apresentados os principais problemas e conflitos que ocorrem presentemente nestas unidades. Utilizando como área de estudo o Núcleo Picinguaba do Parque Estadual da Serra do Mar, situado no litoral norte do Estado de S o Paulo, s o apresentadas informa es para o planejamento e gest o do veraneio e do Ecoturismo no Núcleo Picinguaba, que visam contribuir para redu o dos problemas encontrados no manejo destas áreas protegidas.
Mesoscopy and scanning electron microscopy of the trabelular projections in the superior sagittal sinus
Arquivos de Neuro-Psiquiatria , 1999,
Echoes of the emergence of the Cold War in Brazil (1947-1953) Ecos da emergência da Guerra Fria no Brasil (1947-1953)
Sidnei Munhoz
Diálogos , 2010, DOI: 10.4025/dialogos.v6i1.231
Abstract: The purpose of this paper is to advance the study of possible relationships between the emergence of the Cold War and the political repression that took place in Brazil in the immediately after the Second World War. The article examines the hypothesis that there were both endogenous and exogenous origins of the political repression. Furthermore, it supports the idea that the Brazilian elites, faced with the deterioration of the wartime alliances, returned to their conservatism and traditional anticommunism. As result, the registration of Communist Party was cancelled, the working-class movement and other popular organizations were severely repressed, the press was censured and even progressive military groups and suspected left-wing diplomats became targets of repression. O propósito deste texto é estudar as possíveis rela es entre a emergência da Guerra Fria e a repress o política ocorrida no Brasil no imediato pós II Guerra Mundial. O artigo trabalha com a hipótese de que as raízes dessa repress o política s o tanto endógenas quanto exógenas. Além disso, defende a idéia de que t o logo as rela es envolvendo a grande alian a da II Guerra Mundial deterioraram as elites brasileiras retornaram ao seu conservadorismo e tradicional anticomunismo. Como resultado, o registro do partido comunista foi cancelado, o movimento operário e outras organiza es populares foram duramente reprimidos, a imprensa foi censurada e mesmo grupos militares progressistas e diplomatas supostamente vinculados à esquerda tornaram-se alvos da repress o.
Page 1 /298
Display every page Item

Copyright © 2008-2017 Open Access Library. All rights reserved.