UENF

São José dos Campos, Brazil
São José dos Campos, Brazil
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This study aims to evaluate the forest horizontal structure of Cafundó Natural Heritage Private Reserve, located in Cachoeiro de Itapemirim, Espírito Santo. In order to that, twenty five plots were established (total area: 2,5 hectares) and all trees with DBH ≥ 5 cm were surveyed. A total of 4557 individuals were sampled, distributed in 255 species, 152 genera and 54 families. The diversity index (H') was 4,13. The values of basal area (33,02 m2.ha-1) and density (1823 ind.ha-1) are closed to the range of other Semideciduous Seasonal Forest in Southeast. The species with the highest importance value (IV) were: Astronium concinnum, Pseudopiptadenia contorta, Neoraputia alba. This forest fragment is composed predominantly by late secondary species and can be characterized as well preserved, with considerable species diversity and peculiar aboreal flora, standing out the ecological importance of this area for conservation in the south region of the Espírito Santo.


Nadai D.V.,IFF | Simoes J.B.,UENF | Gatts C.E.N.,UENF | Miranda P.C.M.L.,University of Campinas
Fuel | Year: 2013

In this work, we have implemented a method which uses structural information from 1H NMR spectra of fatty esters and biodiesels to infer the corresponding Cetane Number (CN). The method consists of the successive application of Principal Component Analysis (PCA), Fuzzy Clustering and a feed-forward Artificial Neural Network (ANN) to the data set. PCA recognized redundant information, and determined the number of clusters for subsequent Fuzzy Clustering classification. At the final stage ANN used membership values from the Fuzzy Clustering process as inputs to predict the cetane number of different types of biodiesel (complex mixtures) from data of pure substances (esters). Root-mean-square deviations were in the range of 0.2-2.4. © 2012 Elsevier Ltd. All rights reserved.


PubMed | State University of Norte Fluminense, UENF and Federal University of Rio de Janeiro
Type: Journal Article | Journal: Acta cirurgica brasileira | Year: 2015

To describe the dog as a model for studying laparoscopic correction of experimental diaphragmatic ruptures.Five male dogs were used in this study. Under laparoscopic approach, a defect of 7 cm was created on the left ventral insertion of the diaphragm. Fourteen days after this procedure, the abdomen was explored using laparoscopic access and the diaphragmatic defect was corrected with intracorporeal suture. The dislocated organs, surgical time, and suturing time were recorded. Analgesia and clinical condition were monitored during the postoperative period.All animals recovered well from the diaphragmatic rupture creation. After 14 days, abdominal organs (liver, spleen, omentum and/or intestine) were found inside the thoracic cavity in all animals. It was possible to reposition the organs and suture the defect by laparoscopic access in three animals. These animals showed excellent postoperative recovery. It was not possible to reposition the liver safely when it was friable.Laparoscopic creation of diaphragmatic rupture in dogs is feasible. Dogs are a good model for training and studying the correction of experimentally created diaphragmatic rupture by the laparoscopic approach. A friable liver is a complicating factor that should be taken into account. Animals submitted to laparoscopic correction showed excellent postoperative recovery.


Rocha M.V.,UENF | Sthel M.S.,UENF | Silva M.G.,UENF | Paiva L.B.,UENF | And 3 more authors.
Applied Physics B: Lasers and Optics | Year: 2012

In this work we present a laser photoacoustic arrangement for the detection of the important greenhouse gas methane. A quantum-cascade laser and a differential photoacoustic cell were employed. A detection limit of 45 ppbv in nitrogen was achieved as well as a great selectivity. The same methodology was also tested in the detection of methane issued from natural gas powered vehicles (VNG) in Brazil, which demonstrates the excellent potential of this arrangement for greenhouse gas detection emitted from real sources. © Springer-Verlag 2011.


Couto F.M.,UENF | Sthel M.S.,UENF | Castro M.P.P.,UENF | da Silva M.G.,UENF | And 4 more authors.
Applied Physics B: Lasers and Optics | Year: 2014

In order to investigate the generation of greenhouse gases in sugarcane ethanol production chain, a comparative study of N2O emission in artificially fertilized soils and soils free from fertilizers was carried out. Photoacoustic spectroscopy using quantum cascade laser with an emission ranging from 7.71 to 7.88 µm and differential photoacoustic cell were applied to detect nitrous oxide (N2O), an important greenhouse gas emitted from soils cultivated with sugar cane. Owing to calibrate the experimental setup, an initial N2O concentration was diluted with pure nitrogen and detection limit of 50 ppbv was achieved. The proposed methodology was selective and sensitive enough to detect N2O from no fertilized and artificially fertilized soils. The measured N2O concentration ranged from ppmv to ppbv. © 2014, Springer-Verlag Berlin Heidelberg.


dos Santos P.C.,UENF | Freitas M.S.M.,UENF | Freitas S.J.,UENF | da Silva M.P.S.,UENF | Berilli S.S.,UENF
Revista Brasileira de Fruticultura | Year: 2011

The use of arbuscular mycorrhizal fungi (AMF) can be an alternative to improve the production of seedlings, since they can shorten the time of seedlings formation in several fruits. The objective of this study was to evaluate the effect of AMF on the growth of pineapple shoots from the technique of removing the apical meristem of crowns also inoculated with AMF. The experiment was set up in randomized block design in a 2x3 factorial, with two pineapple cultivars ('Smooth Cayenne' and 'Pearl') and three microbiological treatments (no inoculation, inoculation with Glomus etunicatum and inoculation with a mixture of the fungi Glomus clarum and Gigaspora margarita, with four replications. The inoculation with AMF, provided no reduction in the duration of the seedlings production. The AMF inoculation on cultivar Pearl showed to be not beneficial, the microbiological treatment with the mixture performed like a parasite, reducing the nutritional content of P and K and is not suitable for this cultivar. In the other hand, the 'Smooth Cayenne' inoculation with AMF provided an increase of the P content in the seedlings.


Neto A.S.M.,State University of Norte Fluminense | Jasmim J.M.,UENF | Ponciano N.J.,UENF
Ciencia Rural | Year: 2011

The purpose of the research was to determine, through the calculation of net present value (VPL), internal return rate (TIR) and Economic Payback (PBE), the viability of heliconias production in the Rio de Janeiro State, as well as identify and verify, by means of sensitivity analysis in which extent some factors of the production system exercise impact on the profitability of the producing regions. The results showed that helicônia production is a profitable activity, according to the method of TIR and considering minimal attractiveness rates (TMA) of 6% and 12% for calculating the net present value (VPL). However, there are limitations in the sector of produce flow, delaying the consolidation of this market. The percentage of losses and the selling price of the product presented determinant factors on the time of return on investment (PBE). In addition, the selling price of the product was the variable with greater effect on profitability, followed by the land value and the seedlings cost.


Campos B.M.,UENF | Viana A.P.,UENF | Quintal S.S.R.,UENF | Goncalves L.S.A.,UENF | Pessanha P.G.O.,UENF
Revista Brasileira de Fruticultura | Year: 2013

The present study aimed at evaluating the genetic divergence among 138 guava accessions coming from the Germplasm Collection of the Universidade Estadual do Norte Fluminense Darcy Ribeiro (UENF) based on morphological, agronomic and physic-chemical traits by Ward - Modified Location Model (MLM). Thirteen descriptors were evaluated, five qualitative (flesh color, fruit surface, shape at stalk end, neck width and uniformity of the flesh color) and eight quantitative (fruit weight, fruit diameter, fruit length, pulp revenue, soluble solids contents, total titratable acidity, total soluble solids/total titratable acidity ratio and ascorbic acid). High genetic variability was detected considering morphological, agronomic and physic-chemical traits in the 138 guava accessions studied. The procedure of the likelihood function showed that the ideal numbers of groups was eight, with an increment value of 67.51. Group III was considered the most distant, while groups I, II, IV, V and VI the closest. The Ward- MLM procedure is a useful tool for detecting genetic divergence and cluster accessions using both qualitative and quantitative variables.


The objective of this study was to investigate the effect of nitrogen fertilization and an analogue of brassinosteroid in the growth and nutrition from the sectioning stem of the pineapple 'Smooth Cayenne'. The experiment was conducted in randomized block design in a 3×4 factorial design, were evaluated three doses of N (5, 10 and 15 g L -1), using urea as a source, and four doses of a brassinosteroid analogue (0; 0.5, 0.75 and 1.0 mg L -1) with four replications. Each plot was composed of 20 stem sections. At 270 days after planting the seedlings were harvested and evaluated in relation to the length, diameter, leaf number and leaf area. Then the seedlings were placed to dry in an oven at 70°C to obtain dry mass and nutritional analysis of leaf tissue which evaluated the levels of N, K, Ca, Mg, S, Fe, Cu, Zn and Mn. The analogue of brassinosteroid promoted increment in all the characteristics of growth of the pineapple seedling evaluated, and provide higher nitrogen content in top of seedlings. Nitrogen fertilization resulted in only slight increase in the length and diameter of the seedlings and did not affect the number of leaves, leaf area, dry weight and nutritional status of the seedlings.


Filho J.A.V.,State University of Norte Fluminense | Lima K.B.,State University of Norte Fluminense | Freitas M.S.M.,State University of Norte Fluminense | Martins M.A.,UENF | Olivares F.L.,UENF
Revista Brasileira de Fruticultura | Year: 2012

An experiment, at greenhouse conditions, was carried out to evaluate the effects of inoculation with mycorrhizal fungi (AMF) and diazotrophic bacteria, on sweet passion fruit seedling growth under different phosphorus levels. The experiment design was randomized blocks in 3x2x4 factorial, with three treatments with fungi: Gigaspora margarita, Glomus clarum and control (without fungus); two treatments with bacteria: Burkholderia sp. + Burkholderia silvatlantica and control (without bacteria); and four P levels: 0, 15, 30 and 60 mg dm -3 of soil, with four replications. The experimental unit consisted of a 3.5 dm -3 pot with three plants. The seedlings were grown from seed and transplanted to pots containing a sterile soil: sand mixture (1:2 v: v). At 90 days after transplantation were assessed: height, diameter of stem, leaf area, shoot dry weight, percentage of root colonization by fungi and enumeration of diazotrophs in roots. Despite the presence of diazotrophic bacteria, inoculation with AMF provided increase in height, shoot dry weight, leaf area and stem diameter of seedlings, both at 0 and 15 mg dm -3 of P levels. Bacteria increased height and leaf area in shoots when associated with the AMF species of G. margarita, however in the absence of AMF, they reduced the shoot dry mass, regardless of P levels in the substrate.

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