Centro Universitario Of Volta Redonda Unifoa

Volta Redonda, Brazil

Centro Universitario Of Volta Redonda Unifoa

Volta Redonda, Brazil

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Mulinari D.R.,State University of Rio de Janeiro | Guedes J.R.,Centro Universitario Of Volta Redonda Unifoa | Simba B.G.,São Paulo State University
Polymer Bulletin | Year: 2017

The aim of this work is to obtain and evaluate the mechanical and thermal properties of low Density Polyethylene (LDPE) composites reinforced with fibers from Australian King Palm fibers. Raw fibers were characterized by X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM) and Fourier Transform Infrared (FTIR) Spectroscopy. The chemical composition of the fibers was also evaluated. After characterizing the fibers were mixed into the LDPE, in proportions of 5, 10, 15 and 20% (wt/wt) using a thermokinetic mixer model MH-50H. Furthermore tensile, flexural and impact specimens were prepared for evaluation of mechanical properties. The composites were analyzed through SEM micrographs of fractured surfaces and thermal analysis. The results indicate that the reinforcement decreases the thermal stability of the composites, but caused an increase the mechanical properties of the composites. The composites reinforced with of raw fibers 20% (wt/wt) showed significant increase in the tensile strength, flexural and impact. © 2017 Springer-Verlag Berlin Heidelberg


Sorrentino R.,Centro Universitario Of Volta Redonda Unifoa | Senna A.R.,Federal University of Bahia | Lowry J.K.,College Street
Zootaxa | Year: 2014

A new species of the genus Shoemakerella Pirlot, 1936 is described for the Southeastern Brazilian continental shelf. The new species is easily recognized from the others in the genus mainly by the shape of the gnathopod 2. This is the first species of Shoemakerella from Brazilian waters. © 2014 Magnolia Press.


Souza-Filho J.F.,Federal University of Pernambuco | Senna A.R.,Centro Universitario Of Volta Redonda Unifoa
Zoosystematics and Evolution | Year: 2012

A new species, Megamphopus robustisetae sp. n., is described from the deep waters of Campos Basin, Rio de Janeiro, Brazil. The new species is easily distinguished from its congeners by lacking eyes and the distinct ornamentation of gnathopod 2 of both male and female. This paper raises the number of species of Megamphopus Norman, 1869 to 13. Also, the genus Megamphopus is recorded for the first time from Brazil. A key with all species of the genus is provided. © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.


Quadra A.,Centro Universitario Of Volta Redonda Unifoa | Sorrentino R.,Centro Universitario Of Volta Redonda Unifoa | Senna A.R.,Federal University of Bahia | Serejo C.S.,Federal University of Rio de Janeiro
Latin American Journal of Aquatic Research | Year: 2014

The lysianassoid species Eurythenes thurstoni Stoddart & Lowry, 2004 is recorded for the first time to the Southern Atlantic Ocean, with material collected from the South Mid-Atlantic Ridge during the MAR-ECO Project expeditions. The examined material presents some important variations when compared with the original description discussed in the text.


Senna A.R.,Centro Universitario Of Volta Redonda Unifoa | Serejo C.S.,Federal University of Rio de Janeiro
Zootaxa | Year: 2012

A new genus and species of the Eriopisella group are described from Brazilian waters. The new genus is monotypic and closely related to the melitid genus Netamelita Barnard, 1962, but is distinguishable from the latter by the propodus of gnathopods 1 and 2 that is wedge-shaped, subtriangular and has the palm longer than posterior margin. This is the first amphipod of the Eriopisella group reported from Brazil. Copyright © 2012 · Magnolia Press.


Senna A.R.,Centro Universitario Of Volta Redonda Unifoa | Serejo C.S.,Federal University of Rio de Janeiro
Zoosystematics and Evolution | Year: 2012

The gammarellid genus Nuuanu J. L. Barnard, 1970 is described for the first time from Brazilian waters, on the coast of the state of Espírito Santo. Nuuanu peroa sp. n. shares the diagnostic characters of the genus, such as the gnathopods 1 and 2 subchelate, dissimilar in size and shape, pereopod 7 with basis shield-like and posteriorly crenulate, and uropod 3 with both rami short, but inner ramus less than half the length of outer ramus. However, the new species differs from the others in the genus in that it is the only one that has the anteroventral corner of the head produced in a stout acuminate spine. This is the first record of the genus Nuuanu from Brazilian waters. © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.


Baldani J.I.,Embrapa Agrobiologia | Reis V.M.,Embrapa Agrobiologia | Videira S.S.,Embrapa Agrobiologia | Videira S.S.,Centro Universitario Of Volta Redonda Unifoa | And 2 more authors.
Plant and Soil | Year: 2014

Background and aim: Nitrogen-fixing bacteria or diazotrophs have been isolated for many years using different formulations of N-free semi-solid media. However, the strategies used to isolate them, and the recipes of these media, are scattered through the published literature and in other sources that are more difficult to access and which are not always retrievable. Therefore, the aim of this work was to collate the various methods and recipes, and to provide a comprehensive methodological guide and their use by the scientific community working in the field of biological nitrogen fixation (BNF), particularly with non-leguminous plants.Methods: Procedures used for bacterial counting and identification either from rhizosphere soil or on the surface of, or within, plant tissues (to access “endophytic” bacteria) are presented in detail, including colony and cell morphologies. More importantly, appropriate recipes available for each N-free semi-solid culture medium that are used to count and isolate various diazotrophs are presented.Results: It is recognized by those working in the field of BNF with non-legumes that the development of the N-free semi-solid medium has allowed a tremendous accumulation of knowledge on the ecology and physiology of their associated diazotrophs. At least 20 nitrogen-fixing species have been isolated and identified based on the enrichment method originally developed by Döbereiner, Day and collaborators in the 70’s. In spite of all the advances in molecular techniques used to detect bacteria, in most cases the initial isolation and identification of these diazotrophs still requires semi-solid media.Conclusions: The introduction of the N-free semi-solid medium opened new opportunities for those working in the area of BNF with non-legumes not only for elucidating the important role played by their associated microorganisms, but also because some of these bacteria that were isolated using semi-solid media are now being recommended as plant growth-promoting inoculants for sugarcane (Saccharum sp.), maize (Zea mays) and wheat (Triticum aestivum) in Brazil and other countries. Further progress in the field could be made by using a combination of culture-independent molecular community analyses, in situ activity assessments with probe-directed enrichment, and isolation of target strains using modified or standard semi-solid media. © 2014, Springer International Publishing Switzerland.


Feres De Melo A.R.,Centro Universitario Of Volta Redonda Unifoa | Ferreira De Souza A.,Southern Cross University of Brazil | De Oliveira Perestrelo B.,Southern Cross University of Brazil | Leite M.F.,Southern Cross University of Brazil
Oral Surgery, Oral Medicine, Oral Pathology and Oral Radiology | Year: 2014

Objective To evaluate clinical oral and salivary parameters of individuals with juvenile idiopathic arthritis (JIA). Study Design Clinical parameters and whole saliva were collected from children aged 6 to 12 years with JIA (n = 36) and from a healthy, matched control group (n = 36). The clinical and salivary parameters evaluated were the dental caries (decayed, missing, or filled teeth), gingival and simplified oral hygiene indices, salivary flow rate, pH, buffer capacity, total protein, and secretory immunoglobulin A concentrations. Results JIA individuals presented poorer oral hygiene (P ≤.05) but no difference in the dental caries and gingival indices. JIA patients presented an increase in total protein concentration (86%) and buffer capacity in the range of pH 6.9 to 6.0 (10%) and a reduction in initial pH (6%), buffer capacity in the range of pH ≥ 7.0 (50%), and immunoglobulin A concentration (27%) (P ≤.05). Conclusions JIA is associated with poor oral hygiene and salivary changes, including reductions in immune factors and an altered profile of salivary buffer capacity. © 2014 Elsevier Inc. All rights reserved.


Marques Jr. P.R.,Centro Universitario Of Volta Redonda Unifoa | Senna A.R.,Centro Universitario Of Volta Redonda Unifoa
Zootaxa | Year: 2013

The species of the amphipod family Melphidippidae are distributed worldwide in marine habitats, but there is no record of this family from Brazil so far. A new genus and species of Melphidippidae are described from Brazilian waters. Steb-bingiella gen. nov. is monotypic and is distinguished from the other genera of the family by the presence of: antenna 1 with accessory flagellum 7-articulate, lateral cephalic lobe subacute, with globular eyes extremely produced, reaching be-yond the second article of peduncle of antenna 2; gnathopods stout and slightly subchelate; coxae 3 and 4 with strong an-terior projection and coxae 5 and 7 with strong posterior projection; telson cleft, not fully movable, with two globular lobes, about 2X wider than long. Stebbingiella globulosa sp. nov. is the first species of Melphidippidae recorded from Brazilian waters. Copyright © 2013 Magnolia Press.


de Araujo M.J.F.,Centro Universitario Of Volta Redonda Unifoa | de Araujo M.V.F.,Centro Universitario Of Volta Redonda Unifoa | Mulinari D.R.,Centro Universitario Of Volta Redonda Unifoa
Materials Science Forum | Year: 2016

The aim of this study was to develop a sustainable composter that works associating aerobic digestion of organic matter from waste to anaerobic digestion of that organic matter. The composter was developed from a composite of polyester resin reinforced with palm fibers to contribute to the waste generated in the consumption of palm in Brazilian territory. Moreover, biodegradation of the developed composite was studied in contact with the organic material deposited in the composter. Results showed that the composter has potential to generate good quality organic compost for fertilization and also showed that the composite in contact with the organic matter reduced mechanical properties of the material. © 2016 Trans Tech Publications, Switzerland.

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