Olivier R.S.,Federal University of Mato Grosso do Sul
Neotropical Entomology | Year: 2017
Temnomastax spielmanni Olivier, 2014 n. syn. is proposed as new synonym of Eumastacops nemorivaga Rehn & Rehn, 1942. New distribution records in Peru and Colombia are provided for the following four species: Eumastax nigrovittata Descamps, 1979; Paramastax nigra (Scudder, 1875); Pseudomastax nigroplagiata Descamps, 1970; and Pseudomastax personata (Bolívar, 1881). New information on the distribution of Paramastax flavovittata Descamps, 1973 and E. nemorivaga is added, resulting in the expansion of the geographic distribution. Photographs of all studied species are provided. © 2016, Sociedade Entomológica do Brasil.
Silva R.A.,Federal University of Mato Grosso do Sul
Journal of applied oral science : revista FOB | Year: 2011
During post preparation, the root canal is exposed to the oral cavity, and endodontic treatment may fail because of coronal leakage, bacterial infection and sealing inability of the luting cement. this study quantified the interfacial continuity produced with conventional dual-cure and self-adhesive resin cements in the cervical (C), medium (M) and apical (A) thirds of the root. Forty single-rooted human teeth were restored using Reforpost # 01 conical glass-fiber posts and different materials (N=10 per group): group AC=Adper™ ScotchBond™ Multi-purpose Plus + AllCem; group ARC=Adper™ ScotchBond™ Multi-purpose Plus + RelyX ARC; group U100=RelyX U100; and group MXC=Maxcem Elite. After being kept in 100% humidity at 37°C for 72 hours, the samples were sectioned parallel to their longitudinal axis and positive epoxy resin replicas were made. The scanning electron micrographs of each third section of the teeth were combined using Image Analyst software and measured with AutoCAD-2002. We obtained percentage values of the interfacial continuity. Interfacial continuity was similar in the apical, medium and cervical thirds of the roots within the groups (Friedman test, p>0.05). Comparison of the different cements in a same root third showed that interfacial continuity was lower in MXC (C=45.5%; M=48.5%; A=47.3%) than in AC (C=85.9%, M=81.8% and A=76.0%), ARC (C=83.8%, M=82.4% and A=75.0%) and U100 (C=84.1%, M=82.4% and A=77.3%) (Kruskal-Wallis test, p<0.05). Allcem, Rely X ARC and U100 provide the best cementation; cementation was similar among root portions; in practical terms, U100 is the best resin because it combines good cementation and easy application and none of the cements provides complete interfacial continuity.
Araujo M.S.,São Paulo State University |
Costa-Pereira R.,Federal University of Mato Grosso do Sul
Biology Letters | Year: 2013
The increase in the number of species with decreasing latitude is a striking pattern of global biodiversity. An important feature of studies of this pattern up to now has been the focus on species as the fundamental unit of interest, neglecting potential within-species ecological diversity. Here, we took a new perspective on this topic by measuring the degree to which individuals within populations differ in niche attributes across a latitudinal gradient (range: 54.01° S to 69.12° N). We show that 156 populations of 76 species across a wide range of vertebrate and invertebrate animal taxa contain more ecologically diverse assemblages of individuals towards lower latitudes. Our results add a new level of complexity to our understanding of global patterns of biodiversity and suggest the possibility that niche variation is partly responsible for the latitudinal gradients of species diversity. © 2013 The Author(s) Published by the Royal Society. All rights reserved.
De Lima F.,Federal University of Mato Grosso do Sul |
Maia G.,Federal University of Mato Grosso do Sul
Nanoscale | Year: 2015
This study investigated the synthesis of graphene oxide nanoribbons (GONRs) and graphene nanoribbons (GNRs) from multiwalled carbon nanotubes (MWCNTs), and the behavior of thin films of MWCNTs, GONRs, and GNRs on a glassy carbon surface in the presence of two redox probes (Fe(CN)6 3-/Fe(CN)6 4- and O2) employing cyclic voltammetry, electrochemical impedance spectroscopy, and hydrodynamic voltammetry (HV) as a simple procedure for characterizing these films. The feasibility of using these electrochemical techniques for this purpose opens up the possibility of applying them to biosensors and electrocatalysts using surface-supported MWCNT, GONR, and GNR materials. GNR1 resembles an internodal segment of bamboo cut lengthwise, with a shallow troughing at its center, while GNR2 resembles stacked ribbons, each ∼16 nm wide, with points of structural damage and points of four-ribbon connection measuring 60 nm or wider, sufficiently catalytic for the oxygen reduction reaction to occur, unlike the other modified electrodes investigated in acidic, 0.1 M KH2PO4 (pH 7.0), and 0.1 M KOH solutions (HV results). Transmission electron microscopy and thermogravimetric analysis were employed to characterize the MWCNTs, GONRs, and GNRs. This journal is © The Royal Society of Chemistry.
De Brito M.A.G.,São Paulo State University |
Galotto L.,Federal University of Mato Grosso do Sul |
Sampaio L.P.,São Paulo State University |
De Azevedo Melo G.,São Paulo State University |
Canesin C.A.,São Paulo State University
IEEE Transactions on Industrial Electronics | Year: 2013
This paper presents evaluations among the most usual maximum power point tracking (MPPT) techniques, doing meaningful comparisons with respect to the amount of energy extracted from the photovoltaic (PV) panel [tracking factor (TF)] in relation to the available power, PV voltage ripple, dynamic response, and use of sensors. Using MatLab/Simulink and dSPACE platforms, a digitally controlled boost dc-dc converter was implemented and connected to an Agilent Solar Array E4350B simulator in order to verify the analytical procedures. The main experimental results are presented for conventional MPPT algorithms and improved MPPT algorithms named IC based on proportional-integral (PI) and perturb and observe based on PI. Moreover, the dynamic response and the TF are also evaluated using a user-friendly interface, which is capable of online program power profiles and computes the TF. Finally, a typical daily insulation is used in order to verify the experimental results for the main PV MPPT methods. © 2012 IEEE.
Schiaveto-de-Souza A.,Federal University of Mato Grosso do Sul
Brazilian journal of medical and biological research = Revista brasileira de pesquisas médicas e biológicas / Sociedade Brasileira de Biofísica ... [et al.] | Year: 2013
Spinal cord injury is an extremely severe condition with no available effective therapies. We examined the effect of melatonin on traumatic compression of the spinal cord. Sixty male adult Wistar rats were divided into three groups: sham-operated animals and animals with 35 and 50% spinal cord compression with a polycarbonate rod spacer. Each group was divided into two subgroups, each receiving an injection of vehicle or melatonin (2.5 mg/kg, intraperitoneal) 5 min prior to and 1, 2, 3, and 4 h after injury. Functional recovery was monitored weekly by the open-field test, the Basso, Beattie and Bresnahan locomotor scale and the inclined plane test. Histological changes of the spinal cord were examined 35 days after injury. Motor scores were progressively lower as spacer size increased according to the motor scale and inclined plane test evaluation at all times of assessment. The results of the two tests were correlated. The open-field test presented similar results with a less pronounced difference between the 35 and 50% compression groups. The injured groups presented functional recovery that was more evident in the first and second weeks. Animals receiving melatonin treatment presented more pronounced functional recovery than vehicle-treated animals as measured by the motor scale or inclined plane. NADPH-d histochemistry revealed integrity of the spinal cord thoracic segment in sham-operated animals and confirmed the severity of the lesion after spinal cord narrowing. The results obtained after experimental compression of the spinal cord support the hypothesis that melatonin may be considered for use in clinical practice because of its protective effect on the secondary wave of neuronal death following the primary wave after spinal cord injury.
Zagatto A.M.,Federal University of Mato Grosso do Sul |
Gobatto C.A.,University of Campinas
International Journal of Sports Medicine | Year: 2012
The aim of this study was to verify the validity of the curvature constant parameter (W), calculated from 2-parameter mathematical equations of critical power model, in estimating the anaerobic capacity and anaerobic work capacity from a table tennis-specific test. Specifically, we aimed to i) compare constants estimated from three critical intensity models in a table tennis-specific test (Cf); ii) correlate each estimated W with the maximal accumulated oxygen deficit (MAOD); iii) correlate each W with the total amount of anaerobic work (W ANAER) performed in each exercise bout performed during the Cf test. Nine national-standard male table tennis players participated in the study. MAOD was 63.0(10.8) mL·kg 1 and W values were 32.8(6.6) balls for the linear-frequency model, 38.3(6.9) balls for linear-total balls model, 48.7(8.9) balls for Nonlinear-2 parameter model. Estimated W from the Nonlinear 2-parameter model was significantly different from W from the other 2 models (P<0.05). Also, none W values were significantly correlated with MAOD or W ANAER (r ranged from 0.58 to 0.51; P>0.13). Thus, W estimated from the 2-parameter mathematical equations did not correlate with MAOD or W ANAER in table tennis-specific tests, indicating that W may not provide a strong and valid estimation of anaerobic capacity and anaerobic capacity work. © 2012 Georg Thieme Verlag KG Stuttgart New York.
Marcato Junior J.,Federal University of Mato Grosso do Sul |
Tommaselli A.M.G.,São Paulo State University
ISPRS Journal of Photogrammetry and Remote Sensing | Year: 2013
The major contribution of this paper relates to the practical advantages of combining Ground Control Points (GCPs), Ground Control Lines (GCLs) and orbital data to estimate the exterior orientation parameters of images collected by CBERS-2B (China-Brazil Earth Resources Satellite) HRC (High-resolution Camera) and CCD (High-resolution CCD Camera) sensors. Although the CBERS-2B is no longer operational, its images are still being used in Brazil, and the next generations of the CBERS satellite will have sensors with similar technical features, which motivates the study presented in this paper. The mathematical models that relate the object and image spaces are based on collinearity (for points) and coplanarity (for lines) conditions. These models were created in an in-house developed software package called TMS (Triangulation with Multiple Sensors) with multi-feature control (GCPs and GCLs). Experiments on a block of four CBERS-2B HRC images and on one CBERS-2B CCD image were performed using both models. It was observed that the combination of GCPs and GCLs provided better bundle block adjustment results than conventional bundle adjustment using only GCPs. The results also demonstrate the advantages of using primarily orbital data when the number of control entities is reduced. © 2013 International Society for Photogrammetry and Remote Sensing, Inc. (ISPRS).
Potential use of cyclopoida (crustacea, copepoda) as trophic state indicators in tropical reservoirs [Uso potencial de cyclopoida (crusta cea, copepoda) como indicador de estado trófico em reservatórios tropicais]
da Silva W.M.,Federal University of Mato Grosso do Sul
Oecologia Australis | Year: 2011
The pelagic zones of fifty three São Paulo State reservoirs were sampled as a part of the project "Diversity of zooplankton in relation to conservation and degradation of aquatic ecosystems in the State of São Paulo'', within the Biota/Fapesp Program (1999 - 2003). The trophic state index (TSI) was calculated, using total phosphorus and chlorophyll a. The Cyclopoida (Copepoda) populations were analyzed, and richness and relative abundance of the dominant species determined. Most values of the TSI ranged from oligotrophic to mesotrophic. The species richness did not present linear relationships with the TSI values. Nine species of Cyclopoida were dominant. Thermocyclops decipiens was the most frequently dominant species, followed by T. minutus, Mesocyclops ogunnus, T. inversus, T. iguapensis, Microcyclops anceps, Tropocyclops prasinus, Microcyclops alius and Mesocyclops longisetus. Correlations between the abundances of different species were highly negative, with values over 85%, especially between the Thermocyclops species. The species that are potential bioindicators due to the relationship between their dominance and reservoir trophic state are the following: Thermocyclops decipiens and Tropocyclops prasinus as indicators of mesotrophic/eutrophic systems; Thermocyclops inversus and Microcyclops anceps as indicators of oligotrophic/mesotrophic systems, Thermocyclops minutus and T. iguapensis as indicators of oligotrophic systems and Mesocyclops ogunnus as indicator of eutrophic systems.
Santos S.R.,Federal University of Mato Grosso do Sul |
Maia G.,Federal University of Mato Grosso do Sul
Electrochimica Acta | Year: 2012
This study reports the use of cyclic voltammetry (CV), hydrodynamic voltammetry, and electrochemical impedance spectroscopy (EIS) to investigate horseradish peroxidase (HRP) direct adsorption onto a glassy carbon (GC) surface and the adsorption of HRP in the presence of polymyxin (PM) forming Nafion®-covered HRP-PM filmsonaGC surface. The bioelectrocatalytic behavior of these electrodes toward H 2 O 2 and O 2 reduction was also studied. The electrochemical reaction rate constant of HRP-PM/Nafion films was comparable to that of bare GC electrodes containing HRP and carbon nanotubes or HRP and graphene in their films. GC/HRP-PM/Nafion electrodes were sufficiently bioelectrocatalytic for H 2O 2 and O 2 reduction (even at pH 7 and 37 °C) - a feature that suggests their possible use as negative electrodes in biofuel cells. From EIS experiments, it was possible to estimate the resistance to electron hopping (R eh) between heme Fe 3+/Fe 2+ redox centers in HRP enzymes and between these and H 2O 2 or O 2 molecules. © 2012 Elsevier Ltd. All rights reserved.