Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99


Any time

2020 ( 54 )

2019 ( 727 )

2018 ( 819 )

2017 ( 753 )

Custom range...

Search Results: 1 - 10 of 462616 matches for " Reginaldo A. Bertolo "
All listed articles are free for downloading (OA Articles)
Page 1 /462616
Display every page Item
A Method for Environmental Data Management Applied to Megasites in the State of Sao Paulo, Brazil  [PDF]
Marcos Barbosa, Reginaldo A. Bertolo, Ricardo Hirata
Journal of Water Resource and Protection (JWARP) , 2017, DOI: 10.4236/jwarp.2017.93021
Abstract: The management of contaminated areas with multiple sources of contamination (megasites) is among the biggest challenges for the Brazilian environmental agencies, especially because aquifers in big urban areas, like the Sao Paulo Metropolitan Region, are important sources of water for human supply purposes. One of the main reasons that hamper the proper management of urban environmental problems is a lack of a unified system where all information can be easily integrated into regional studies. To address this problem, a method for data integration and management using a Geographic Information System (GIS) was developed. This method was applied to the case of a regional contamination of an aquifer by chlorinated solvents at a former industrial district in Sao Paulo city, named Jurubatuba, but the final product might also be used for data management of contaminated areas for the entire State of Sao Paulo. The main result obtained was that the site-by-site approach for aquifer contamination management is ineffective. Furthermore, there are many other suspected and potential sources of contamination without any information available after more than 10 years since the contamination problem was discovered at the FIZ 131.
Environmental Forensic Investigation in the Residential Neighborhood Volta Grande IV, Volta Redonda, RJ, Brazil, Using TPH and PAHs Analyses in Soil Samples  [PDF]
José C. R. Gouvêa Jr., Fernando Sim?o e Silva, Reginaldo A. Bertolo, Tiago R. Moura, Stephen Emsbo-Mattingly
Journal of Environmental Protection (JEP) , 2019, DOI: 10.4236/jep.2019.107058
Abstract: This article presents the results of a forensic investigation concerning the origin of hydrocarbons detected in the subsurface soil of the residential neighborhood Volta Grande IV, Volta Redonda, RJ, Brazil. Previous investigations identified several areas with concentrations of volatile organic compounds (VOCs) and polycyclic aromatic hydrocarbons (PAHs) above the Brazilian regulatory standards of CONAMA 420/2009 within the study area. Concern was raised that these hydrocarbons might be derived from local steel mill wastes. This forensic investigation determined that the VOCs in the residential soil are associated with gasoline and possibly diesel fuel oil releases into the subsurface soils that are not associated with the steel mill waste. The PAHs in residential subsurface soil generally fell below background concentrations and are likely associated with regional soot. The PAHs in the three samples with concentrations above background (out of a total of thirty-six samples) exhibit compositional features similar to coal byproducts, such as tar and coke, possibly attributable to the steel mill operation. This work discusses the geoforensic data and chemical signatures that support these findings.
Biogeochemical processes and the diversity of Nhecolandia lakes, Brazil
Almeida, Teodoro I. R;Calijuri, Maria do Carmo;Falco, Patrícia B;Casali, Simone P;Kupriyanova, Elena;Paranhos Filho, Antonio C;Sigolo, Joel B;Bertolo, Reginaldo A;
Anais da Academia Brasileira de Ciências , 2011, DOI: 10.1590/S0001-37652011000200004
Abstract: the pantanal of nhecolandia, the world's largest and most diversified field of tropical lakes, comprises approximately 10,000 lakes, which cover an area of 24,000 km2 and vary greatly in salinity, ph, alkalinity, colour, physiography and biological activity. the hyposaline lakes have variable phs, low alkalinity, macrophytes and low phytoplankton densities. the saline lakes have phs above 9 or 10, high alkalinity, a high density of phytoplankton and sand beaches. the cause of the diversity of these lakes has been an open question, which we have addressed in our research. here we propose a hybrid process, both geochemical and biological, as the main cause, including (1) a climate with an important water deficit and poverty in ca2+ in both superficial and phreatic waters; and (2) an elevation of ph during cyanobacteria blooms. these two aspects destabilise the general tendency of earth's surface waters towards a neutral ph. this imbalance results in an increase in the ph and dissolution of previously precipitated amorphous silica and quartzose sand. during extreme droughts, amorphous silica precipitates in the inter-granular spaces of the lake bottom sediment, increasing the isolation of the lake from the phreatic level. this paper discusses this biogeochemical problem in the light of physicochemical, chemical, altimetric and phytoplankton data.
Application of in situ chemical oxidation technique with potassium permanganate for the remediation of a shallow aquifer contaminated with chlorinated solvents
Alaine Santos da Cunha,Reginaldo Antonio Bertolo
Geologia USP : Série Científica , 2012, DOI: 10.5327/z1519-874x2012000300006
Abstract: In situ chemical oxidation is a method that is frequently being used for the remediation of contaminated areas, since it presents an adequate efficiency in the reduction of the contaminant mass, particularly chlorinated ethenes, in a relatively short period of time. This manuscript presents the results of the application of this method, using the injection of potassium permanganate as the remediation agent, in an impacted area with chlorinated organic compounds, especially 1,1-dichloroethene. The effectiveness of this remediation method is related to the complexity of the conceptual model of the contaminated site and to the conduction of specific studies in laboratory and pilot tests in field scale, prior to the accomplishment of the full-scale remediation. Therefore, this work contributes presenting a description of the procedures that are commonly used for conducting this kind of studies. In the case under study, it was estimated that the mass of 1.1-dichloroethene (1.1-DCE) was reduced from 15.53 to 1.81 kg in groundwater 22 months after the injection of potassium permanganate in the aquifer. The average concentrations of 1.1-DCE in groundwater decreased from 200 to 24 g/L, which value is lower than the environmental standard limit and also to the calculated target of remediation based on human-health risk assessment. Significant contamination rebounds were not identified in the aquifer after the injection of the chemical oxidant. The suitable results of the remediation in this case may be related to the relatively low aquifer heterogeneity and low original concentrations of the contaminant.
Natural occurrence of hexavalent chromium in a sedimentary aquifer in Urania, State of S?o Paulo, Brazil
Bourotte, Christine;Bertolo, Reginaldo;Almodovar, Marta;Hirata, Ricardo;
Anais da Academia Brasileira de Ciências , 2009, DOI: 10.1590/S0001-37652009000200009
Abstract: anomalous concentrations of hexavalent chromium have been detected in ground-water of the adamantina aquifer inat least 54 municipalities located in the northwestern region of the state of s?o paulo, southeast brazil, occasionallyexceeding the permitted limit for human consumption (0.05 mg.l-1). an investigation was conducted in the municipality of urania, where the highest concentrations of chromium were detected regionally. it was defined that the originof this contamination is natural, since high concentrations of chromium were detected in aquifer sandstones (averageof 221 ppm) and also in pyroxenes (6000 ppm), one of the main heavy minerals found in the sediments. besides, noother possible diffuse or point sources of contamination were observed in the study area. stratification of ground-waterquality was observed and the highest concentrations of cr6+ were detected at the base of the aquifer (0.12 mg.l-1),where ground-water shows elevated values for redox potential (472.5 mv) and ph (8.61). the origin of cr6+ in water may be associated with the weathering of pyroxene (augite), followed by the oxidation of cr3+ by manganese oxides. the highest concentrations of cr6+ are probably related to desorption reactions, due to the anomalous alkaline phfound in ground-water at the base of the aquifer.
Water-Rock Interaction and the Hydrogeochemistry of Chromium in Groundwater from Multilevels Monitoring Wells in Urania, SP, Brazil
Reginaldo Antonio Bertolo,Leonardo Nobuo Oshima Marcolan,Christine Laure Marie Bourotte
Geologia USP : Série Científica , 2009,
Abstract: Anomalous natural concentrations of chromium, sometimes exceeding the potability limit (0.05 mg.L-1), have been detectedin the groundwater of Adamantina Aquifer in the municipality of Urania, and in a wide region of the western part ofthe State of S o Paulo. In order to identify the possible geochemical reactions that may explain the occurrence of chromiumin groundwater, chemical and mineralogical analyses were conducted in rock samples collected from deep boreholes drilledin the city of Urania. Multilevel monitoring wells were installed in the boreholes, and stratifi ed groundwater samples werecollected for chemical analyses. The analyses of the borehole samples indicated the occurrence of a geochemical anomaly ofchromium (average concentrations of 221 ppm) and pointed to chrome-diopside containing from 1,000 to 6,000 ppm Cr as themain reactive mineral that contributes to this anomaly. Groundwater chemical analyses indicated the occurrence of a hydrochemicalstratifi cation of the aquifer: waters from the base of the aquifer are alkaline (pH higher than 10) whereas in the shallowzone of the aquifer, pH is neutral to mildly acid. Chromium has been identifi ed in its hexavalent form, and prevails in theaquifer, reaching the maximum concentration of 0.13 mg.L-1. The geochemical reactions that explain the release of chromiumfrom the solid phase to the water probably involve the dissolution of Cr3+ minerals such as diopside, followed by a redox reactionthat oxidizes Cr3+ to Cr6+ and reduces manganese oxide minerals. Additionally, adsorption reactions may take place, anddesorption and mobilization of Cr6+ may be favored in some portions of the deep aquifer where pH is anomalously alkaline.
Lucy A. George,Emilia Bertolo,Carlos Lodeiro
Molbank , 2010, DOI: 10.3390/M702
Abstract: A new fluorescent di-imine compound containing two naphthalene groups has been synthesized by classical Schiff-base reaction between 2,2’-[1,3-phenylene-bis-(methyleneoxy)]dibenzaldehyde and 1-naphthylmethylamine. The new bischromophoric compound has been characterised by IR, NMR and MALDI-TOF MS spectroscopy. The photophysical characterization was carried out by UV-vis and fluorescence emission spectroscopy, using chloroform. The monomer and excimer bands, typical for the naphthalene in solution, are present in the emission spectra for the compound.
Efecto de la vitamina E en el proceso de hemostasia de individuos sanos Effect of vitamin E in haemostasis of healthy individuals
Mariana Villarroel Dorrego,A Barreto,A Bertolo,M Labernia
Acta Odontológica Venezolana , 2008,
Abstract: La vitamina E (VE) es una vitamina liposoluble que actúa como antioxidante y ha sido asociada a tiempos prolongados de sangramiento en individuos sanos. El objetivo del siguiente trabajo fue evaluar el efecto de la VE en el proceso de coagulación de personas sanas. Fueron incluidos en el estudio 211 individuos sanos sin historia de enfermedades que comprometieran la hemostasia y separados en dos grupos dependiendo de la ingesta o no de VE. Los datos epidemiológicos de cada paciente así como el tiempo de protrombina (PT) y el tiempo parcial de tromboplastina (PTT) fueron recolectados. Todos los datos fueron analizados mediante el programa estadístico SPSS versión 13.0 y las medias comparadas usando la prueba estadística t de student. 114 individuos consumian al menos 400mgrs diarios de VE por un lapso no menor de 3 meses (75 mujeres y 39 hombres, edad promedio de 53.82+1.7 a os) y 97 individuos que no consumian VE (55 mujeres y 42 hombres, edad media de 54.29+1.9 a os) fueron incluidos como grupo control. El grupo que consumía VE mostró valores de PT estadísticamente mayores que los controles (p=0.001) (14.3+0.23seg y 13.2+0.23seg respectivamente). Así mismo, los valores de PTT del grupo VE estuvieron estadísticamente por encima de los pacientes control (p<0.0001) (31.19+0.33seg y 28.69+0.18seg respectivamente). El presente estudio sugiere que el consumo contínuo de VE podría alterar los valores de PT y PTT en individuos sanos y por tal razón modificar el proceso de coagulación normal. Vitamin E (VE) is a fat-soluble vitamin that acts as an antioxidant and it has been associated to prolonged bleeding in healthy individuals. The aim of this study was to evaluate the effect of VE in haemostasis. 211 healthy individuals were included and separated into groups depending on the VE ingest. Epidemiological data, prothrombin time (PT) and activated partial thromboplastin time (PTT) were collected. Data was analysed using SPSS 13.0 and means compared by t student test. 114 individuals consuming VE regularly (75 women and 39 men, mean age 53.82+1.7 years) and 97 controls (55 women and 42 men, mean age 54.29+1.9 years) were evaluated. VE group showed PT values significantly higher (p=0.001) than controls (14.3+0.23sec and 13.2+0.23sec respectively), as well as statically augmented PTT times (p<0.0001) (31.19+0.33sec 28.69+0.18sec respectively). VE may alter PT and PTT values in healthy people and therefore modifies haemostasis.
The female body medicated and silenced: gender and performance
Reginaldo Teixeira Mendon?a
Saúde & Transforma??o Social , 2011,
Abstract: Medicines in our society are embedded in a dualistic perspective involving good and evil, the to cure and to cause disease. Thus, health professionals, when dealing with medicines, encounter this dilemma. However, in healthcare it is not always that this dualism is analyzed from the perspective of society, creating a biased view from the pharmaceutical laboratory, leading to the imposition of this on other issues related to medicine comnsumption. From this perspective, from a study conducted with elderly women patients in a psychiatric outpatient clinic in the city of Ribeir o Preto, SP/Brazil, it was sought to analyze the consumption of drugs within the pharmacological class of benzodiazepines and their relationships in the social life of these users. From this, it was found that benzodiazepines, in addition to being used as a pharmacological product, can also be comprehended as a mechanism of power, silencing social issues.
The in vitro effects of dexamethasone, insulin and triiodothyronine on degenerative human intervertebral disc cells under normoxic and hypoxic conditions
A Bertolo,L Ettinger,N Aebli,D Haschtmann
European Cells and Materials (ECM) , 2011,
Abstract: Degeneration of intervertebral discs (IVD) is one of the main causes of back pain and tissue engineering has been proposed as a treatment. Tissue engineering requires the use of highly expensive growth factors, which might, in addition, lack regulatory approval for human use. In an effort to find readily available differentiation factors, we tested three molecules – dexamethasone, triiodothyronine (T3) and insulin – on human IVD cells isolated after surgery, expanded in vitro and transferred into alginate beads. Triplicates containing 40 ng/ml dexamethasone, 10 nM T3 and 10 μg/ml insulin, together with a positive control (10 ng/mL transforming growth factor (TGF)-beta 1), were sampled weekly over six weeks and compared to a negative control. Furthermore, we compared the results to cultures with optimized chondrogenic media and under hypoxic condition (2% O2). Glycosaminoglycan (GAG) determination by Alcian Blue assay and histological staining showed dexamethasone to be more effective than T3 and insulin, but less than TGF-beta1. DNA quantification showed that only dexamethasone stimulated cell proliferation. qPCR demonstrated that TGF-beta1 and the optimized chondrogenic groups increased the expression of collagen type II, while aggrecan was stimulated in cultures containing dexamethasone. Hypoxia increased GAG accumulation, collagen type II and aggrecan expression, but had no effect on or even lowered cell number. In conclusion, dexamethasone is a valuable and cost-effective molecule for chondrogenic and viability induction of IVD cells under normoxic and hypoxic conditions, while insulin and T3 did not show significant differences.
Page 1 /462616
Display every page Item

Copyright © 2008-2017 Open Access Library. All rights reserved.