Santos, Brazil

Time filter

Source Type

Fernandes M.N.,Federal University of São Carlos | Paulino M.G.,Federal University of São Carlos | Sakuragui M.M.,Federal University of São Carlos | Ramos C.A.,Federal University of São Carlos | And 4 more authors.
Aquatic Toxicology | Year: 2013

Through integrating chemical, biochemical and morphological analyses, this study investigated the effects of multiple pollutants on the gill mitochondria-rich cells (MRCs) in two fish species, Astyanax fasciatus and Pimelodus maculatus, collected from five sites (FU10, FU20, FU30, FU40 and FU50) in the Furnas Hydroelectric Power Station reservoir. Water analyses revealed aluminum, iron and zinc as well as organochlorine (aldrin/dieldrin, endosulfan, heptachlor/heptachlor epoxide and metolachlor) contamination at all of the sites, with the exception of FU10. Copper, chrome, iron and zinc were detected in the gills of both species, and aldrin/dieldrin, endosulfan and heptachlor/heptachlor epoxide were detected in the gills of fish from all of the sites, with the exception of FU10. Fish collected at FU20, FU30 and FU50 exhibited numerous alterations in the surface architecture of their pavement cells and MRCs. The surface MRC density and MRC fractional area were lower in fish from FU20, FU30, FU40 and FU50 than in those from the reference site (FU10) in the winter, and some variability between the sites was observed in the summer. The organochlorine contamination at FU20 and FU50 was associated with variable changes in the MRCs and inhibition of Na+/K+-ATPase (NKA) activity, especially in P. maculatus. At FU30, the alterations in the MRCs were associated with the contaminants present, especially metals. A multivariate analysis demonstrated a positive association between the biological responses of both species and environmental contamination, indicating that under realistic conditions, a mixture of organochlorines and metals affected the MRCs by inhibiting NKA activity and inducing morphological changes, which may cause an ionic imbalance. © 2012 Elsevier B.V.

Sakuragui M.M.,Federal University of São Carlos | Paulino M.G.,Federal University of São Carlos | Pereira C.D.S.,Federal University of São Paulo | Pereira C.D.S.,Santa Cecilia University | And 3 more authors.
Environmental Pollution | Year: 2013

This study investigated the relationship between contaminant body burden and the oxidative stress status of the gills and livers of two wild fish species in the Furnas Hydroelectric Power Station (HPS) reservoir (Minas Gerais, Brazil). Gills and livers presented similar pathways of metals and organochlorine bioaccumulation. During June, organochlorines were associated with lipid peroxidation (LPO), indicating oxidative stress due to the inhibition of the antioxidant enzymes superoxide dismutase and glutathione peroxidase. In the most polluted areas, metal concentrations in the liver were associated with metallothionein. During December, contaminants in the gills and liver were associated with catalase activity and LPO. Aldrin/dieldrin was the contaminant most associated with oxidative damage in the livers of both species. This integrated approach shed light on the relationship between adverse biological effects and bioaccumulation of contaminants inputted by intensive agricultural practices and proved to be a suitable tool for assessing the environmental quality of man-made reservoirs. © 2013 Elsevier Ltd. All rights reserved.

Tonietto A.E.,Federal University of São Carlos | Lombardi A.T.,Federal University of São Carlos | Henriques Vieira A.A.,Federal University of São Carlos | Parrish C.C.,Memorial University of Newfoundland | And 2 more authors.
Water Research | Year: 2014

Cylindrospermopsis raciborskii is a cosmopolitan and potentially toxic planktonic Cyanobacteria that produces and exudes copious amounts of dissolved organic materials. This organism dominates the eutrophic reservoir Barra Bonita (Brazil), where it normally blooms throughout the year. This investigation focused on the characterization of such exudates analyzing their capacity to complex copper, zinc, lead and cadmium through the determination of ligand concentration (CL) and conditional stability constant (logK'ML), as well as elemental composition (C, H, N and S), the content of carbohydrates, proteins, lipids and dissolved organic carbon (DOC). The dissolved organic material was fractionated into 3 molecular weights (>30kDa; 30-10kDa; 10-3kDa) and each fraction was analyzed. The results showed that in the >30kDa and 30-10kDa fractions carbohydrates dominate over proteins and lipids. Different CL and logK'ML were obtained for the different molecular weight fractions of the excreted organic materials, suggesting high diversity of ligands. In the >30kDa, there were more complexing sites (CL) for Cu, but higher affinity (K') for Zn. In the 30-10kDa fraction, the higher CL was for Cd, but the greatest affinities were for Cu and Zn. In the 10-3kDa fraction, higher CL was obtained for Cd and Zn, while Cu and Cd had the highest strengths of association. In the environment, such diversity of ligands and strengths of association can result in a displacement of metals weakly bound to the EOM, and increase metal buffering capacity of the environment, supporting higher metal inputs before toxic effects are detected in the biota. © 2013 Elsevier Ltd.

Oliveira G.D.,Santa Cecilia University | Marinho M.M.F.,University of Sao Paulo
Zootaxa | Year: 2016

Moenkhausia abyss is herein described from the rio Amazonas basin lowlands. The new species can be distinguished from the congeners by presenting the combination of the following characters: a dark blotch located on the upper caudal-fin lobe and the lower lobe hyaline, 25-29 branched anal-fin rays, humeral spot rectangular, vertically oriented, extending horizontally through two or two and a half scales and located over the third to the fifth lateral line scales, five longitudinal scale rows above the lateral line, predorsal scales arranged in a single not interrupted median row and 30-34 perforated lateral line scales. Brief comments on Moenkhausia megalops are provided. Copyright © 2016 Magnolia Press.

Vaske Junior T.,Santa Cecilia University | Rotundo M.M.,Santa Cecilia University | Rotundo M.M.,University of Sao Paulo
Pan-American Journal of Aquatic Sciences | Year: 2012

Fifteen specimens of the pelagic stingray, Pteroplatytrygon violacea were caught in depth between 9 and 50 m off São Paulo State coast, among them the largest recorded size in nature with 90 cm disk width.

Valadao Vicente S.J.,University of Sao Paulo | Ishimoto E.Y.,University of Sao Paulo | Cruz R.J.,University of Sao Paulo | Seabra Pereira C.D.,Santa Cecilia University | Torres E.A.F.D.S.,University of Sao Paulo
Journal of Agricultural and Food Chemistry | Year: 2011

This study evaluated the acute effect of the administration of coffee brew in the activity of phase II antioxidant enzymes in the hepatic tissue of rats. A single dose of this beverage increased the activity of the enzymes SOD, CAT, and GPx; the maximum increase occurred 1 h after administration (19.1, 22.1, and 25.1%, respectively). These changes were statistically significant (p < 0.05), the response was shown to be dose-dependent (p < 0.05), and the return to basal levels took >4 h from the intervention, suggesting a long-term effect. The total antioxidant capacity of the hepatic tissue also exhibited a peak 1 h after the intervention (6.5%), but the increase was not statistically significant and the response was not dose-dependent due to the low exposure to coffee. These results indicate that coffee increases the activities of antioxidant enzymes, improving protection against oxidative stress. © 2011 American Chemical Society.

Vicente S.J.V.,Santa Cecilia University | Ishimoto E.Y.,University of Sao Paulo | Torres E.A.F.S.,University of Sao Paulo
Journal of Agricultural and Food Chemistry | Year: 2014

This study investigated the effect of a 28 day administration of coffee brew on the activity of antioxidant enzymes in rats. After this period of 2.0 mL/day dosages of this beverage, the activities of hepatic superoxide dismutase, catalase, and glutathione peroxidase increased 74.8, 59.4, and 135.2%, respectively, whereas the cytosolic level of Nrf2 increased 131.3%. At the same time, the total antioxidant capacity of the hepatic tissue increased 25.1%, improving the defensive status against oxidative stress. At the end of the experiment, the levels of biomarkers alanine transaminase and aspartate transaminase remained equal to the control group, and no changes were observed in the hepatic histoarchiteture of the animals, suggesting that the liver tissue was not impaired by the exposure to coffee. The changes in enzyme activities and antioxidant capacity were statistically significant (p < 0.05), indicating that coffee could be considered an important alternative against oxidative stress and its correlated degenerative diseases. © 2013 American Chemical Society.

Silvano R.A.M.,Federal University of Rio Grande do Sul | Silvano R.A.M.,Santa Cecilia University | Begossi A.,Santa Cecilia University | Begossi A.,University of Campinas
Neotropical Ichthyology | Year: 2012

We analyzed fishermen's local ecological knowledge (LEK) about the feeding habits, trophic interactions, habitats, fishing grounds, migration, and reproduction of nine coastal fishes in Búzios Island, southeastern Brazilian coast. We interviewed 39 fishermen using standardized questionnaires. Fishermen's LEK on habitat use and trophic interactions for the studied fishes agreed with the scientific literature, allowing the organization of reef and pelagic food webs. The interviewed fishermen mentioned that submerged rock formations would be important habitats for some large commercial fishes, such as Seriola spp., Caranx latus and Epinephelus marginatus. In some instances there was no scientific data to be compared with fishermen's LEK, and thus this kind of knowledge would be the only available source of information, such as for reproduction and migration of most of the studied fishes. We suggest herein ways to apply fishermen's LEK to develop and improve fisheries management measures, such as zoning of marine space, marine protected areas, and closed fishing seasons. Fishermen's LEK may be an important and feasible support to fisheries management and co-management. © 2012 Sociedade Brasileira de Ictiologia.

Da Silva Filho J.I.,Santa Cecilia University | Misseno Da Cruz C.,Centro Universitario Monte Serrat
IEEE Latin America Transactions | Year: 2016

Paraconsistent mathematics, also called Inconsistent Mathematics, is considered as the study of common mathematical objects, such as sets, numbers and functions, where some contradictions are allowed. Within certain conditions, Paraconsistent logic (PL), which is a non-classical Logic, presents as main property tolerance contradiction in its fundamentals without that the conclusions are invalidated. The PL in its structural form, which uses two annotation values-PAL2v, can be used to substantiate a Differential Calculus with Paraconsistent derivative of first and second order. We introduce here the Paraconsistent Partial Differential Equation (PPDE) aligned with processes of numerical methods for an example application in analysis with Explicit solution of temperature distribution in one-dimensional way. To obtain the results was used an analogy of application of PPDE with the law of heat conduction of Fourier, considering the same mathematical procedures of finite differences. © 2016 IEEE.

Toneli J.T.C.L.,Federal University of ABC | Monteiro L.B.,Santa Cecilia University | Briso M.A.J.,Federal University of ABC | Moraes Jr. D.,Santa Cecilia University
Chemical Engineering Transactions | Year: 2013

The thermal efficiency of a spray drying process is related to operating parameters such as the temperature and the mass flow rate of the inlet air of the dryer and the increase of these values will result in higher energy costs. The objective of this work was to evaluate the effect of recycling the outlet air of a pilot plant spray dryer with rotary atomizer on the thermal efficiency of the drying process. The results showed that the thermal efficiency is related to inlet air properties and it can be improved with the recirculation of the outlet air. Copyright © 2013, AIDIC Servizi S.r.l.

Loading Santa Cecilia University collaborators
Loading Santa Cecilia University collaborators