State University of Norte Fluminense

www.uenf.br
Campos, Brazil

The State University of Norte Fluminense "Darcy Ribeiro" is a public university located in the city of Campos dos Goytacazes in the State of Rio de Janeiro. The University was planned by anthropologist Professor Darcy Ribeiro. The university was designed mainly by the renowned architecture Oscar Niemayer. It was established on February 27, 1991. Wikipedia.

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Beggio P.C.,State University of Norte Fluminense
Journal of Physics G: Nuclear and Particle Physics | Year: 2017

We investigated the energy dependence of the parton-parton inelastic cross sections, parton-parton inelastic overlap functions and the C q moments in proton interactions from √s = 10 to 14000 GeV. The approach we used is based on a phenomenological procedure where elastic and inelastic proton observables are described in a connected way by exploring the unitarity of the S-matrix. Applying a quantum-chromodynamics-inspired eikonal model, that contains contributions of the quark-quark, quark-gluon and gluon-gluon interactions, theoretical predictions on inelastic cross sections and C q moments are compared with measurements and show a successful description of the experimental data. The Koba-Nielson-Olesen hypothesis violation is discussed as a consequence of the semihard contribution to the multiparticle production in the interactions, in accordance with several experimental and theoretical previous results. A prediction of the ratio as a function of the collision energy is presented and also compared with the experimental information. © 2017 IOP Publishing Ltd.


Carvalho A.O.,State University of Norte Fluminense
Current pharmaceutical design | Year: 2011

Plant defensins are cationic peptides that are ubiquitous within the plant kingdom and belong to a large superfamily of antimicrobial peptides found in several organisms collectively called defensins. The primary structure of these peptides includes 45 to 54 amino acid residues with considerable sequence variation. At the level of three-dimensional structure, they are small and globular, composed of three anti-parallel β-sheets and one α-helix, which is highly conserved among these peptides. The three-dimensional structure is stabilized by four disulfide bridges formed by eight strictly conserved Cys residues. Two of these bridges compose the Cys-stabilized α-helix β-strand motif, which is found in other peptides with biological activities. Plant defensins present numerous biological activities, such as inhibiting protein synthesis, ion channel function and α-amylase and trypsin activity; impairing microbial, root hair and parasitic plant growth; mediating abiotic stress and Zn tolerance; altering ascorbic acid redox state; stimulating sweet taste sensation; serving as epigenetic factors; affecting self-incompatibility; and promoting male reproductive development. Some of these biological activities, such as microbial growth inhibition and sweet taste induction, coupled with a scaffold that provides these peptides with incredible physicochemical resistance to harsh environments and the potential for simple amino acid substitution, raise the opportunity to improve the function of defensins or introduce new activities, endowing these peptides with great biotechnological and medical significance. This review will cover the biological activities and roles of plant defensins and will focus on their application in the field of biotechnology.


Carey R.J.,SUNY Upstate Medical University | Carrera M.P.,State University of Norte Fluminense
Behavioural Brain Research | Year: 2014

Pavlovian conditioning of drug effects is generally acknowledged to be a critical factor in the development and persistence of drug addiction. In drug conditioning the focus has essentially been on one type of Pavlovian conditioning, namely, delay conditioning in which the CS and drug UCS overlap and are temporally contiguous. Another type of Pavlovian conditioning is trace-conditioning in which the CS terminates before the onset of the UCS. While trace conditioning has been extensively studied in conditioning studies using a punctual CS and a non-drug UCS, trace conditioning has not been considered as having a role in drug conditioning. In several recent reports we have conducted experiments in which we first established a contextual drug CS using a delay conditioning protocol and subsequently used this same CS in a trace drug conditioning protocol with the same or different drug treatment and showed that the CS could be strongly modified by trace conditioning. These observations take on importance in that it has been well established that delay and trace conditioning are mediated by different CNS systems. Delay conditioning is mediated by cerebellar mechanisms, conforming to the general idea of Pavlovian conditioning as a reflexive type of learning whereas trace conditioning involves the hippocampus and frontal cortex brain structures more commonly associated with voluntary behavior. In this proposal we suggest that the emergence of potent drug associations that motivate drug-seeking behavior and addiction are initiated by delay conditioning and subsequently amplified and linked to higher brain functions by trace conditioning. © 2014 Elsevier B.V.


Braga I.L.S.,INVISION | Moraes F.S.,State University of Norte Fluminense
Geophysics | Year: 2013

We have developed and applied an inverse Q filter formulation using the continuous wavelet transform (CWT), which provides a natural domain for time-variant operations, such as compensation for propagation in attenuating and dispersive media. The well-known linear attenuation model, given as a function of time and frequency, was applied very efficiently over wavelet coefficients in the time-frequency domain to correct for amplitude and phase distortions, as necessary. The inverse CWT yields the recovered trace with a broader bandwidth. The process works on a trace-by-trace basis, making no distinction if the data is pre-or poststack. Our motivation was to develop gather conditioning tools to enhance prestack interpretation techniques such as amplitude variation with offset (AVO) analysis and inversion -a technique that is often compromised by tuning and other propagation related issues that degrade seismic resolution. Thus, we investigated the AVO fidelity of our filter and the sensitivity of the results to incorrect values of Q, using real and synthetic data. Our synthetic data experiments clearly showed that AVO anomalies are recovered and preserved in a stable manner, even with values of Q off by 50% of its correct value. The application in time-migrated gathers shows a very natural increase in the vertical definition of the events, especially due to the partial elimination of the tuning effect. The benefits for imaging are also evidenced by comparing stacked sections before and after inverse Q filtering. The higher resolution of seismic sections leads to a better definition of smaller scale stratigraphic and structural features. © 2013 Society of Exploration Geophysicists.


Moraes F.S.,State University of Norte Fluminense
Leading Edge (Tulsa, OK) | Year: 2011

Major oil companies generally hold a large investment portfolio, including several development projects with some worth hundreds of millions of US dollars. It is the geophysicist's task to assist in gathering the information required to optimize field development, including the positioning of infill drilling and determining the best oil recovery strategy. The final goal is to achieve an improved recovery factor at a reduced cost of drilling. © 2011 Society of Exploration Geophysicists.


Schripsema J.,State University of Norte Fluminense
Phytochemical Analysis | Year: 2010

The present state-of-the-art of NMR in plant metabolomics is reviewed. Attention is paid to the different practical aspects of the application of NMR. The sample preparation, the measurement of the spectrum, quantitative aspects and data analysis are discussed. Each stage has its specific problems, which are pointed out and recommendations are made. Copyright © 2009 John Wiley & Sons, Ltd.


Pena G.F.,State University of Norte Fluminense
Genetics and molecular research : GMR | Year: 2012

This study aimed to obtain estimates of stability and adaptability of phase launched materials and materials recommended in the country, for the northern and northwestern regions of Rio de Janeiro State, Brazil, and made a comparative analysis of different methods to evaluate stability and adaptability of grain yield and popping expansion. To this end, 10 genotypes were evaluated (UNB2U-C3, UNB2U-C4, BRS Angela, Viçosa, Beija-Flor, IAC 112, IAC 125, Zélia, Jade, and UFVM2 Barão de Viçosa) in five environments. The Yates and Cochran method revealed that genotypes UFV2M Barão de Viçosa, BRS Angela and UNB2U-C3 were the most stable for grain yield. This method also indicated superiority of genotypes UNB2U-C3, UNB2U-C4, BRS Angela, Viçosa, IAC 125, and Zélia for popping expansion. The Plaisted and Peterson and Wricke methods demonstrated that genotypes Zélia and UNB2U-C4 were the most productive and stable. These methods indicated genotypes UNB2U-C3 and BRS Angela as the most stable for popping expansion. The Kang and Phan ranking system uses methods based on analysis of variance and classified population UNB2U-C4 as the genotype with the highest stability of grain production and confirmed cultivar BRS Angela as the most stable for popping expansion. Genotypes IAC 112 and UNB2U-C4 were the most stable and adapted for grain yield, according to the Lin and Binns method. The P(i) statistics also ranked UNB2U-C3 and UNB2U-C4 as the genotypes with the best predictability and capacity for popping expansion.


Monteiro L.R.,State University of Norte Fluminense
Hystrix | Year: 2013

Phylogenetic comparative methods are one of the most important parts of the morphometric toolkit for studies of morphological evolution. The assessment of repeated independent events of evolution of phenotypic and associated ecological-functional traits is still a starting point for the study of adaptation, but modern comparative approaches go beyond correlative methods, allowing for the modeling of evolutionary scenarios and analyses of trait evolution patterns. The evidence for adaptive change due to ecological diversification is stronger (even if still circumstantial) if models that predict increases in diversification rate fit the data well and the morphological changes are associated with ecological and functional changes. A large body of literature is dedicated to methodological and theoretical aspects of comparative methods, but in the context of univariate traits. On the other hand, biological shape is a complex trait, and morphometric data is essentially multivariate. Whereas most comparative methods allow for direct multivariate extensions, dimension reduction is an almost certain requirement due to the high dimensionality of morphometric data sets and the large number of evolutionary parameters that need to be estimated by comparative methods. Objective methods with considerable statistical support to determine data dimensionality exist, but the applied literature usually relies on subjective criteria to assess how many shape dimensions should be retained. The most appropriate calculation and interpretations of principal components, the most popular dimension reduction method, are also topics that should be considered more carefully in applications. The maturity of comparative methods and the development of model-based approaches linking macroevolutionary patterns and microevolutionary processes provide an exciting perspective for the study of morphological evolution. © 2013 Associazione Teriologica Italiana.


de Oliveira J.G.,State University of Norte Fluminense | Vitoria A.P.,State University of Norte Fluminense
Food Research International | Year: 2011

The papaya (Carica papaya L.) is a tropical fruit that is widely cultivated and consumed, both for its agreeable flavor as well as its many pharmacological properties. This review will discuss the fruit's origin and principal growing regions in the world and will briefly explore its nutritional and pharmacological attributes. In addition, we will identify and comment on some of the most common physiological disorders that occur postharvest. Such disorders compromise the quality of the fruit, bringing financial losses to the productive sector, along with serious economic and social consequences to papaya-growing countries. Among these disorders, physiological bruising, also known as "skin freckles", characterized by the appearance of blemishes on the fruit while still in its growth stage, is one of the main problems associated with the crop. Possible causes of and current information on bruising are dealt with in this article. Other physiological disorders of the papaya such as pulp flesh translucency, pulp softening, and hard lumps in papaya flesh are also discussed. © 2011 Elsevier Ltd.


Freitas A.L.P.,State University of Norte Fluminense
Transportation Research Part A: Policy and Practice | Year: 2013

In Brazil, buses represent the main mode of public transportation. However, in recent years intercity and interstate bus companies have been facing a growing competition with other forms of transportation such as bus companies competitors, illegal transportation companies, chartered buses, and, more recently, air companies. In this scenario characterized by growing competition, it is essential to evaluate the quality of road transportation of passengers. In order to contribute to the analysis of this issue, this paper presents a methodological approach to assess the quality of intercity road transportation of passengers, according to the customers' perspective. By conducting a case study in a city of almost 500,000 inhabitants from the interior of Rio de Janeiro, an Importance-Satisfaction Analysis (ISA) and an assignment procedure were used in order to obtain: (i) the main factors (criteria) that influence the quality of service intercity road transportation of passengers, (ii) the importance degree of criteria related to road transportation of passengers, (iii) the satisfaction of the users of road transportation under the considered criteria, (iv) the critical criteria/items, and (v) the categories which best represent the quality of service intercity road transportation according to the passengers' perspective. Finally, several possible corrective actions to improve the quality of services considering each critical item/criterion were highlighted and special recommendations were done for the critical process (ticket sales). © 2013 Elsevier Ltd.

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