Navegando por Assunto "Fruta"

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Acesso aberto (Open Access)
Induction and Morpho-Ultrastructural Analysis of Organogenic Calli of a Wild Passionfruit
(2014-12) CARVALHO, Milene Alves de Figueiredo; PAIVA, Renato; STEIN, Vanessa Cristina; HERRERA, Raírys Cravo; PORTO, Jorge Marcelo Padovani; VARGAS, Daiane Peixoto; ALVES, Eduardo
This work studied a new protocol for organogenic calli induction and characterization of the morphology and ultrastructure of callogenesis in leaf explants of Passiflora gibertii N. E. Brown, a native passion fruit species from Brazil. Calli induction was performed in different growth conditions (light and dark), different MS medium salt concentrations (MS and MS half strength) and the presence or absence of coconut water. The leaf explants maintained in the dark were more responsive to bud formation. In order to reduce spending on in vitro culture, the most suitable induction medium for P. gibertii organogenesis could, therefore be the MS half strength salt concentration medium maintained in the dark. The addition of coconut water to the culture medium was essential for both calli induction and bud formation. The morphological and ultrastructural features of the organogenic calli were isodiametric cells, characterized by an organized cellular system, nucleus with prominent nucleoli, presence of starch grains and dense cytoplasm rich in endoplasmic reticulum. The scanning electron microscopy demonstrated that buds were present on these calli.
Acesso aberto (Open Access)
Influence of temperature, concentration and shear rate on the rheological behavior of malay apple (Syzygium malaccense) juice
(Universidade Federal do Pará, 2016-06) SANTOS, Pedro Henrique; SILVA, Luiza Helena Meller da; RODRIGUES, Antonio Manoel da Cruz; SOUZA, José Antonio Ribeiro de
The aim of this study was to evaluate the rheological behavior of malay apple, a traditional Amazonian fruit with high bioactive properties, at different temperatures and soluble solids concentrations. The experiments were carried out in a Brookfield R/S Plus rheometer with concentric cylinders geometry. Power Law, Herschel-Bulkley, Mizrahi-Berk, and Sisko rheological models were fitted to the experimental data. The malay apple juice (pulp and skin) showed a pseudoplastic behavior for all temperatures and concentrations with flow behavior indexes lower than 1. The temperature effect on the samples’ apparent viscosity was analyzed by the Arrhenius equation. The activation energy increased with a decrease in the soluble solids concentration, showing that the lower the concentration, the greater the temperature influence on the apparent viscosity. The soluble solids effect was described by the exponential equation. The exponential factor increased with the temperature increasing, showing that the higher the temperature, the greater the effect of the soluble solids concentration on samples’ apparent viscosity. Finally, a triparametric mathematical model combining temperature, concentration, and shear rate was proposed aiming to evaluate its effects on the samples’ apparent viscosity and has accurately adjusted to the data with high correlation index R2.
Acesso aberto (Open Access)
Inventário dos Drosofilídeos (Diptera) associados a frutos, na Floresta Nacional de Caxiuanã, Melgaço, Pará, Brasil
(Universidade Federal do Pará, 2005-02-25) PRAXEDES, Catarina de Lurdes Bezerra; MARTINS, Marlúcia Bonifácio; http://lattes.cnpq.br/8882047165338427
The objective of this study was to describe the diversity of frugivorous Drosophilidae (Diptera) in Caxiuanã National Forest, Melgaço, Pará, Brazil, utilizing a structured protocol. Two collecting expeditions were carried out betvveen 2003 and 2004. Traps baited with banana were distributed along 12 one km transects in each of 6 arcas separating the parallel streams flowing from the north into Caxiuanã bay in the "Ferreira Pena" Scientific Station in Caxiuanã National Forest. A total of 4,320 individuais were collected, belonging to 36 taxons in two genera Drosophila (subgenus Sophophora and Drosophila) and Neotanygastrella. The dominant species collected was D. willistoni, comprising 33.96% of ali individuais, followed by D. paulistorunt (21.94%), D. sturtevanti (18.73%), D. tropicahs (11.39%) and D. equinoxialis (6.37%) Five cosmopolitan species of melanogaster group occur in Caxiuanã, but the frequency of the group was only 1.75%. Species accumulation curves, generated by EstimateS, approached an asymptote with 315 samples, resulting in estimates from 40 to 53 total species. The Chao2 estimator produced curves that appmached stabilization with an estimate of 50 species. Analyses of the incidence and abundance matrix demonstrated that the collecting localities were similar, sharing from 40% to 66% in composition (Jaccard), with similar distributions of abundance (Morisita values between 85% and 100%). The percentage completeness of the inventory (79%) indicates that only 83 additional samples are necessary (21% increase in sampling effort, without addition singletons) in order to assess the total diversity of frugivorous Drosophilidae. These results demonstrate the efficiency of the methodology used for estimating the diversity of frugivorous drosophilids in Caxiuanã. Of the 23 subgenus Sophophora species collected, 4 were new records for Brazil (D. dacunhai, D. milleri, D. sahans, and D. septentriosaltans) and 8 were new records for Brazilian Arnazonia (D. austrosahans, D. dacunhai, D. magalhaesi, D. milleri, D. neocordata, D. neoelhptica, D. saltans, and D. septentriosahans).