Consulta: subjectFacets:"Ozone"
Registros recuperados: 28
Data/hora: 05/06/2024 03:46:09

Modelación de eventos extremos usando la distribución Dagum.
Provedor de dados: 32
Autores: Sexto Monroy, Benjamín.
En el presente trabajo se implementa la modelación de valores extremos con la metodolog  ía "block maxima", específicamente  en niveles m áximos diarios de ozono de la estaci ón Pedregal de la Cd. de M éxico de los años 2001 a 2008, usando la distribución Dagum que es de cola pesada y es usada generalmente como distribuci ón de ingreso, pero tiene un antecedente en el campo meteorol ógico, donde fue usado para modelar la cantidad de precipitaci ón pluvial. Una visualizaci ón general de los datos, hecha gr áficamente, revela una tendencia a la baja de los niveles m áximos diarios de ozono, por lo cual se decide realizar el an álisis por año. Mediante la prueba de Kolmogorov-Smirnov se prueba si las observaciones de cada año siguen la distribución Dagum. El...
Palavras-chave: Tendencia; Ozono; Valor Extremo; VGAM; Trends; Ozone; Extreme Value; Maestría; Estadística.
Ano: 2010
URL: http://hdl.handle.net/10521/364

Distribución espacial e impacto de aeropoluantes en la salud del bosque de conservación del Distrito Federal.
Provedor de dados: 32
Autores: Franco Islas, Yolanda.
Estudios y observaciones desarrollados por más de 30 años indican que las concentraciones de gases oxidantes que son emitidos diariamente a la atmósfera en la Ciudad de México, producen daños a la vegetación.  La defoliación prematura, el moteado y el bandeado clorótico del follaje, son los primeros síntomas de declinación de  Abies religiosa  y Pinus hartwegii.   El objetivo de esta investigación fue evaluar la distribución espacial y efectos de la contaminación atmosférica en los ecosistemas forestales suburbanos del Distrito Federal.  El muestreo se realizó por estrato forestal: Bosque de oyamel, pino, encino y mixto, en las épocas seca-fría 2011 y cálido-seca 2012.  Se establecieron 62 sitios circulares de 0.1 ha, se colocó un muestreador pasivo...
Palavras-chave: Ozono; Indicador de salud forestal; Índice ajustado de composición foliar; Índice de severidad de daño; Ozone; Forest health indicator; Adjusted index of foliage composition; Damage severity index; Doctorado; Forestal.
Ano: 2014
URL: http://hdl.handle.net/10521/2223

Estimación de Tendencias en Niveles Máximos de  Contaminación usando Regresión por Cuantiles a justando el efecto por variables meteorológicas
Provedor de dados: 32
Autores: Reyes Cervantes, Hortensia Josefina.
En este traba jo se proponen dos metodolog´ıas estad´ısticas de an´alisis basada en la  teor´ıa de valores extremos para modelar tendencias de contaminaci´  on, aplic´andose en  el caso particular de la contaminaci´on ambiental de la Ciudad de M´exico. En la pri-  mera metodolog´ıa, suponiendo que los datos de medici´on de ozono se pueden modelar  de acuerdo a un modelo param´etrico, pues existen las condiciones de regularidad para  la funci´on GVE, se pueden aplicar resultados de la teor´ıa asint´otica para investigar  si hay condiciones para que los par´ametros estimados tengan distribuci´on normal y  se pueda estimar la funci´on cuantil de la distribuci´on GVE. Para la funci´on cuantil  a diferentes niveles, en este caso para p = 0.05, se obtiene la...
Tipo: Tesis
Palavras-chave: Teor´ıa de valores extremos; Ozono troposf´erico; Excedencias; Ozono Theory of extreme values; Tropospheric ozone; Exceedances; Ozone.
Ano: 2012
URL: http://hdl.handle.net/10521/1054

Modelación de eventos extremos usando la distribución Dagum.
Provedor de dados: 32
Autores: Sexto Monroy, Benjamin.
En el presente trabajo se implementa la modelación de valores extremos con la metodolog  ía "block maxima", específicamente  en niveles m áximos diarios de ozono de la estaci ón Pedregal de la Cd. de M éxico de los años 2001 a 2008, usando la distribución Dagum que es de cola pesada y es usada generalmente como distribuci ón de ingreso, pero tiene un antecedente en el campo meteorol ógico, donde fue usado para modelar la cantidad de precipitaci ón pluvial. Una visualizaci ón general de los datos, hecha gr áficamente, revela una tendencia a la baja de los niveles m áximos diarios de ozono, por lo cual se decide realizar el an álisis por año. Mediante la prueba de Kolmogorov-Smirnov se prueba si las observaciones de cada año siguen la distribución Dagum. El...
Palavras-chave: Tendencia; Ozono; Valor Extremo; VGAM; Trends; Ozone; Extreme Value; Maestría; Estadística.
Ano: 2010
URL: http://hdl.handle.net/10521/364

Estimación de tendencias en niveles máximos de contaminación usando regresión por cuantiles ajustando el efecto por variables meteorológicas
Provedor de dados: 32
Autores: Reyes Cervantes, Hortensia Josefina.
En este traba jo se proponen dos metodologías estadísticas de análisis basada en la teoria de valores extremos para modelar tendencias de contaminación, aplicándose en el caso particular de la contaminación ambiental de la Ciudad de México. En la primera metodología, suponiendo que los datos de medición de ozono se pueden modelar de acuerdo a un modelo paramétrico, pues existen las condiciones de regularidad para la función GVE, se pueden aplicar resultados de la teoría asintótica para investigar si hay condiciones para que los parámetros estimados tengan distribución normal y se pueda estimar la función cuantil de la distribución GVE. Para la función cuantil a diferentes niveles, en este caso para p = 0.05, se obtiene la tendencia para las 20 estaciones...
Tipo: Tesis
Palavras-chave: Teoría de valores extremos; Ozono troposférico; Excedencias; Ozono; Doctorado; Estadística; Theory of extreme values; Tropospheric ozone; Exceedances; Ozone.
Ano: 2008
URL: http://hdl.handle.net/10521/1363

ALTERATION OF NITROGEN CYCLING BY AGRICULTURAL ACTIVITIES, AND ITS ENVIRONMENTAL AND HEALTH CONSEQUENCES
Provedor de dados: 73
Autores: Cleemput,Oswald van; Boeckx,Pascal.
The food demands of the increasing world population puts pressure on land use and N availability. In this paper an overview is given of the different N cycling processes affected by agricultural activities. Of the amount of N added to the soil, about half is removed from the field as harvested crop, while the remainder of the N is incorporated into soil organic matter or is lost to other parts of the environment. During the last decades there has been much research on environmental consequences of agricultural activities, mainly on emission of gaseous N compounds (NH3, NO, N2O and N2), but also on N leaching, runoff and erosion. Study of the factors controlling loss of N is complex because of their multiplicity and mutual interactions. More recently...
Tipo: Journal article
Palavras-chave: Acidification; Drinking water; Eutrophication; Greenhouse effect; Nitrogen loss; Ozone.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432005000200005

Processo de ozonização gasosa em milho e seu efeito na redução da micobiota e na degradação de aflatoxinas.
Provedor de dados: 14
Autores: FREITAS-SILVA, O.; CASTRO, I. M. de; TROBETE, F. M.; ASCHERI, J. L. R.; DIREITO, G. M.; PORTO, Y. D.
O presente trabalho estudou o efeito da aplicação de ozônio gasoso sobre a degradação das aflatoxinas AFB1, AFB2, AFG1 e AFG2 em milho, em três diferentes condições experimentais, de modo a se avaliar a viabilidade de um sistema-protótipo proposto para ozonização. A ozonização gasosa mostrou-se uma tecnologia não térmica eficaz para reduzir a contaminação por aflatoxinas em milho triturado. Os tratamentos com ozonização mais drásticos, ou seja, aqueles com maior concentração de ozônio, maior tempo de exposição e menor massa de grãos, apresentaram melhores resultados na redução da contaminação por aflatoxinas totais, alcançando valores próximos a 45%. Portanto, o sistema de ozonização proposto mostrou-se eficaz nas condições estudadas, podendo servir de...
Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E)
Palavras-chave: Descontaminação de micotoxinas; Aflatoxin decontamination; Ozônio; Zea Mays; Tecnologia de Alimento; Grão; Produto de Origem Vegetal; Ozone; Food technology; Vegetable products; Grains.
Ano: 2019
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1110442

Recherche et élimination des facteurs inhibiteurs de croissance dans les élevages piscicoles en circuit fermé
Provedor de dados: 5
Autores: Leonard, Noemie.
Recirculation of the water of fish rearing systems requires a biological treatment based on the nitrifying activity of autotrophic bacteria. In parallel heterotrophic bacterial populations utilise the organic substrate, produced by the fish, to grow. Opposite to the autotrophic populations, the heterotrophic bacteria (1) have a quick growth and (2) might contain fish pathogenic strains. The main aim was to characterise the heterotrophic bacteria populations ?.nd to understand (1) which parameters do control the dynamics of their populations and (2) their influence on the quality of the recirculating water. In a rearing system, the heterotrophic bacterial populations are stable in number and in genus, for a given operating mode. The bacteria are either...
Tipo: Text
Palavras-chave: Carbon; Gills; Bacterium; Humics substances; Fish; Ozone; Aquiculture; Carbone; Branchies; Bacterie; Substances humiques; Poisson; Ozone; Aquaculture.
Ano: 2000
URL: http://archimer.ifremer.fr/doc/2000/these-1728.pdf

Viral depuration of Mytilus galloprovincialis in ozone treated water
Provedor de dados: 5
Autores: Croci, L; Demedici, D; Franco, E; Gabrielli, R; Dipasquale, S; Toti, L.
The depuration effectiveness of Poliovirus 1 and HAV contamined mussels, when subjected to flowing ozonized water, was evaluated. Mussels were experimentally contamined and then depurated up to 72 hours using a pilot depuration system with ozone treated and untreated water. The results showed that viral infectivity titter decreased more rapidly in mussels subjected to ozonized water (from 10 super(4) TCID50 to 10 super(1.5) TCID50 per ml of Poliovirus 1 but in the following period it remained unchanged. Also HAV was detected in the mussels after 72 h of depuration.
Tipo: Text
Palavras-chave: Mytilus galloprovincialis; Bivalvia; Ozonation; Ozone; Viral diseases; Marine molluscs; Self purification.
Ano: 1992
URL: http://archimer.ifremer.fr/doc/1992/acte-1610.pdf

Effect of oxidation–reduction potential on performance of European sea bass (Dicentrarchus labrax) in recirculating aquaculture systems
Provedor de dados: 5
Autores: Li, Xian; Blancheton, Jean-paul; Liu, Ying; Triplet, Sebastien; Michaud, Luigi.
The direct impact of oxidation–reduction potential (ORP) on fish welfare and water quality in marine recirculating aquaculture systems (RAS) is poorly documented. In this study, the effects of the fish size (S1, S2, S3) and ORP level (normal, four successive levels) on the performance of European sea bass (Dicentrarchus labrax) were investigated. Three size fish were distributed into two RAS (RAS and RAS O3). Ozone was injected into RAS O3 to increase the ORP level. The ORP was stabilized to four successive levels: 260–300, 300–320, 320–350, and 300–320 mV in fish tanks during four periods (P1–4). At the last day of each period, the hematological parameters, plasma protein and mortality of sea bass were analyzed. Two-way ANOVA revealed that several...
Tipo: Text
Palavras-chave: ORP; Performance; European sea bass; RAS; Ozone.
Ano: 2014
URL: http://archimer.ifremer.fr/doc/00171/28201/26502.pdf

Eggshell microbiology and quality of hatching eggs subjected to different sanitizing procedures
Provedor de dados: 86
Autores: Clímaco,Winnie Luiza dos Santos; Melo,Érica de Faria; Vaz,Diego Pereira; Saldanha,Mariana Masseo; Pinto,Maria Fernanda Vieira da Silva; Fernandes,Letícia Carolina Cleto; Baião,Nelson Carneiro; Oliveira,Letícia Goulart de; Sant’Anna,Felipe Machado de; Souza,Marcelo Resende de; Lara,Leonardo José Camargos.
Abstract: The objective of this work was to evaluate the effect of different disinfection procedures as alternatives to formaldehyde fumigation on eggshell microbial load and quality of eggs from a 42-week-old Cobb commercial breeder flock. A total of 10,080 clean eggs collected from the nests were randomly distributed in a randomized complete block design, among the following treatment groups: 13.33 g m-3 formaldehyde fumigation, 5-10 ppm ozone fumigation, 6.36 mW cm-2 UV-C light irradiation, spraying with 1.56% hydrogen peroxide, spraying with 0.13% peracetic acid, spraying with water (wet control), and no disinfection procedure (dry control). Per treatment, eight samples of four eggs each were collected before and after the disinfection procedure, in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bacterial count; Ozone; Resistance force; Sanitizers; Thickness; UV light.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2018001001177

Controlling Ozone and Fine Particulates: Cost Benefit Analysis with Meteorological Variability
Provedor de dados: 31
Autores: Shih,   Jhih-Shyang; Bergin,   Michelle S.; Krupnick,   Alan J.; Russell,   Armistead G.
In this paper, we develop an integrated cost-benefit analysis framework for ozone and fine particulate control, accounting for variability and uncertainty. The framework includes air quality simulation, sensitivity analysis, stochastic multi-objective air quality management, and stochastic cost-benefit analysis. This paper has two major contributions. The first is the development of stochastic source-receptor (S-R) coefficient matrices for ozone and fine particulate matter using an advanced air quality simulation model (URM-1ATM) and an efficient sensitivity algorithm (DDM-3D). The second is a demonstration of this framework for alternative ozone and PM2.5 reduction policies. Alternative objectives of the stochastic air quality management model include...
Tipo: Working or Discussion Paper
Palavras-chave: Ambient air; Ozone; Particulate matter; Risk management; Public policy; Cost-benefit analysis; Variability and uncertainty; Stochastic simulation; Stochastic multi-objective programming; Decision-making; National Ambient Air Quality Standards; Environmental Economics and Policy; C6; Q2; Q25; Q28.
Ano: 2003
URL: http://purl.umn.edu/10735

The Evolution of NOx Control Policy for Coal-Fired Power Plants in the United States
Provedor de dados: 31
Autores: Burtraw,   Dallas; Evans,   David A.
Emissions of nitrogen oxides (NOx ) contribute to formation of particulate matter and ozone, and also to acidification of the environment. The electricity sector is responsible for about 20% of NOx emissions in the United States, and the sector has been the target of both prescriptive (command-and-control) and flexible (cap-and-trade) approaches to regulation. We summarize the major NOx control policies affecting this sector, and provide some perspectives as to their effectiveness. While both prescriptive and flexible approaches continue to play an important role, significant new proposals have wholly embraced a cap-and-trade approach.
Tipo: Working or Discussion Paper
Palavras-chave: Emissions trading; Cap and trade; Air pollution; Cost-benefit analysis; Electricity; Particulates; Ozone; Nitrogen oxides; Acid rain; Environmental Economics and Policy; Q25; Q4; D62; Q28.
Ano: 2003
URL: http://purl.umn.edu/10645

Ozone Externalities on Crop Production: Insights from UK Farm Level Data
Provedor de dados: 31
Autores: Neeliah,   Harris; Shankar,   Bhavani.
Tropospheric ozone is an air pollutant thought to reduce crop yields across Europe. Much experimental scientific work has been completed or is currently underway to quantify yield effects at ambient ozone levels. In this research, we seek to directly evaluate whether such effects are observed at the farm level. We use both primal (production function) as well as dual (profit function) methods, with ozone as a fixed input, to explore the extent to which output and profits are affected by ozone in the UK. A panel dataset on UK farms is intersected with spatial data on ozone, and panel data production and profit function estimation methods are used. The production function does predict a statistically significant negative effect of ozone on wheat yields at...
Tipo: Conference Paper or Presentation
Palavras-chave: Ozone; Wheat; Crop production; Production function; Profit function; Crop Production/Industries; Resource /Energy Economics and Policy; Q4; P2.
Ano: 2005
URL: http://purl.umn.edu/24659

Source-Receptor Relationships for Ozone and Fine Particulates in the Eastern United States
Provedor de dados: 31
Autores: Shih,   Jhih-Shyang; Krupnick,   Alan J.; Bergin,   Michelle S.; Russell,   Armistead G.
A key question in developing effective mitigation strategies for ozone and particulate matter is identifying which source regions contribute to concentrations in receptor regions. Using a direct approach with a regional, multiscale three-dimensional model, we derive multiple source-receptor matrices (S-Rs) to show inter- and intrastate impacts of emissions on both ozone and PM2.5 over the eastern United States. Our results show that local (in-state) emissions generally account for about 23% of both local ozone concentrations and PM2.5 concentrations, while neighboring states contribute much of the rest. The relative impact of each state on others varies dramatically between episodes. In reducing fine particulate concentrations, we find that reducing SO2...
Tipo: Working or Discussion Paper
Palavras-chave: Source-receptor; Ozone; Particulate matter; Sensitivity analysis; Air quality simulation; National Ambient Air Quality Standards; Environmental Economics and Policy; Q2; Q25.
Ano: 2004
URL: http://purl.umn.edu/10572

Effect of the ozonization process on the quality of peanuts and crude oil
Provedor de dados: 91
Autores: Alencar,Ernandes R. de; Faroni,Lêda R. D; Soares,Nilda F. F; Carvalho,Marta C. S; Pereira,Katiane F.
The purpose of this study was to evaluate the effect of ozone on the quality of peanut grains and crude oil extracted from these grains. Peanut samples of 1 kg were used, with a moisture content of 8.0% w.b. and stored in 3 L glass recipients. The ozonization process utilized ozone gas concentrations of 13 and 21 mg L-1, temperature of 25 °C, exposure periods of 0, 24, 48, 72 and 96 h, and a flow rate of 1.0 L min-1. Evaluation of peanut quality consisted of analysis for moisture content, electrical conductivity, lipid concentration and peanut color. The qualitative parameters of the crude oil evaluated were free fatty acids, peroxide index and iodine index. In general there was no alteration in peanut quality due to ozone, except for the coloration of the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ozone; Qualitative changes; Coloration.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662011000200009

Ozonated water in the post-harvest treatment of coffee fruits
Provedor de dados: 91
Autores: Brandão,Fernando J. B.; Biaggioni,Marco A. M.; Sperotto,Felipe C. S.; Fujita,Erika; Santos,Paula L.; Silva,Magnun A. P. da.
ABSTRACT Ozone is used in many countries for the treatment of effluents, becoming a viable alternative in sanitation of coffee wastewater. However, the strong ozone oxidation, responsible for its germicidal effect, can also compromise grain and beverage quality. The objective of this study was to evaluate the quality of Arabica coffee in different periods of treatment with ozonated water and its effect after drying. Coffee fruits were subjected to ozonation at regular intervals of 0, 5, 10, 20, and 30 min, with continuous stirring promoted by a recirculating water system at constant rate of 1 ppm of solubilized ozone. The design was completely randomized with five treatments and four replicates. After obtaining the data, the analysis of variance was...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Coffea arabica; Fungi; Ozone; Beverage quality.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662016000900862

Sensitivity of winter phytoplankton communities from Andean lakes to artificial ultraviolet-B radiation
Provedor de dados: 97
Autores: HELBLING,E. WALTER; VILLAFAÑE,VIRGINIA E.; BARBIERI,ELENA S.
During July of 1999 sampling was carried out in five Andean lakes to determine the sensitivity of winter phytoplankton communities to ultraviolet-B radiation (UV-B, 280-320 nm). The studied lakes, Moreno, El Trébol, Nahuel Huapi, Gutiérrez, and Morenito, located in the Patagonia region (41° S, 71° W, 800 m of altitude), had attenuation coefficients for UV-B that ranged from 0.36 m-1 (Lake Moreno) to 2.8 m-1 (Lake Morenito). The samples were inoculated with labeled carbon (NaH14CO3) and incubated in an illuminated chamber (UV-B = 0.35 W m-2, UV-A [320-400 nm] = 1.1 W m-2, and PAR [400-700 nm] = 10.8 W m-2) at 10 °C. The phytoplankton cells were exposed to UV radiation (280-400 nm) + PAR (quartz tubes), and to UV-A + PAR (quartz tubes covered with Mylar-D)....
Tipo: Journal article
Palavras-chave: Ultraviolet-B radiation; Photosynthesis; Phytoplankton; Ozone; Andean lakes.
Ano: 2001
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2001000200005

Comparison of White-rot Fungi and Ozone for Decolorization of Wastewater from Pulp and Paper Industry
Provedor de dados: 106
Autores: Vaithanomsat, P.; Apiwattanapiwat, W.; Siriacha, P.
Palavras-chave: Comparison; Ozone; Decolorization; Wastewater; Pulp; Paper; Industry.
Ano: 2006
URL: http://anchan.lib.ku.ac.th/agnet/handle/001/5018

Effects of ozone on lignin-derived compounds in pulp and paper mill effluent
Provedor de dados: 106
Autores: Kreetachat, T.; Damrongsri, M.; Vaithanomsat, P.
Palavras-chave: Effects; Ozone; Lignin-derived; Compounds; Pulp; Paper.
Ano: 2006
URL: http://anchan.lib.ku.ac.th/agnet/handle/001/5017

Structural responses of Ipomoea nil (L.) Roth 'Scarlet O'Hara' (Convolvulaceae) exposed to ozone
Provedor de dados: 39
Autores: Moura,Bárbara Bâesso; Souza,Sílvia Ribeiro de; Alves,Edenise Segala.
Troposphere ozone (O3) is an important photochemical pollutant due to its high reactivity and phytotoxicity. Plants can show microscopic damage caused by this gas before the detection of visible symptoms. The present study aimed to improve our knowledge concerning the effects of O3 on Ipomoea nil L. cv. Scarlet O'Hara leaves. Plants were exposed at a pollutant site in São Paulo city, with high levels of O3, and fumigation with O3 was also carried out. In plants exposed to the environment, without visible symptoms, hypersensitive response-like (HR-like) and protrusions in the cell walls was observed, indicating oxidative processes; in leaves with visible symptoms, there is epidermis breakdown and the palisade and spongy parenchyma collapse. Fumigation...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ozone; HR-like; Cell wall protrusions; Microscopic damage.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062011000100015

Changes in PEP Carboxylase, Rubisco and Rubisco activase mRNA levels from maize (Zea mays) exposed to a chronic ozone stress
Provedor de dados: 48
Autores: LEITAO,LOUIS; MAORET,JEAN-JOSÉ; BIOLLEY,JEAN-PHILIPPE.
We quantified the ozone impact on levels of Zea mays L. cv. Chambord mRNAs encoding C4-phosphoenolpyruvate carboxylase (C4-PEPc), ribulose-l,5-bisphosphate carboxylase/oxygenase small and large subunits (Rubisco-SSU and Rubisco-LSU, respectively) and Rubisco activase (RCA) using real-time RT-PCR. Foliar pigment content, PEPc and Rubisco protein amounts were simultaneously determined. Two experiments were performed to study the ozone response of the 5th and the 10th leaf. For each experiment, three ozone concentrations were tested in open-top chambers: non-filtered air (NF, control) and non-filtered air containing 40 (+40) and 80 nL L-1 (+80) ozone. Regarding the 5th leaf, +40 atmosphere induced a loss in pigmentation, PEPc and Rubisco activase mRNAs....
Tipo: Journal article
Palavras-chave: Carboxylase; Maize; MRNA; Ozone; Rubisco activase.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602007000200005

Short-term leaf responses of Nicotiana tabacum 'Bel-W3' to ozone under the environmental conditions of São Paulo, SE - Brazil
Provedor de dados: 52
Autores: Souza,Silvia Ribeiro de; Sant'Anna,Silvia Maria Romano; Rinaldi,Mirian Cilene Spasiani; Domingos,Marisa.
The present study aimed to study if the intensity and precocity of short-term leaf responses of Nicotiana tabacum 'Bel-W3' depended on the daily atmospheric levels of ozone and/or daily meteorological conditions in a State Park located in the city of São Paulo, SE Brazil. From 16 September to 14 October 2002, three lots of six potted plants were exposed for fourteen days. Leaf necrosis, atmospheric ozone concentrations and meteorological parameters were daily measured. The average percentage of leaf necrosis ranged from 5% to 20%. A 4th degree polynomial model was proposed to explain daily progress of leaf necrosis on plants. The average ozone levels were increased from morning (1.3-39.2 ppbv) to the midday (1.6-52.0 ppbv) and decreased in the evening...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Leaf necrosis; N. tabacum Bel-W3; Ozone; Meteorological parameters.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132009000100030

Ozone: an emerging technology for the seafood industry
Provedor de dados: 52
Autores: Gonçalves,Alex Augusto.
In recent years, increasing attention has been focused on the safety of foods, and in particular on the intervention methods to reduce and eliminate human pathogens from fresh product, especially fresh seafood. Traditional technology utilizes water with or without a sanitizing agent to wash fresh seafood. Chlorine is the most widely used sanitizing agent available for fresh product, but it has a limited effect in killing bacteria on seafood surfaces. An alternative treatment is being sought to improve food safety. Many research and industrial trials are underway to validate the use of ozone in the food industry. This article intends to show a clean technology to be applied in seafood industry and to show that many studies must be done to demonstrate the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Clean technology; Ozone; Seafood.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132009000600025

Alternative sanitization methods for minimally processed lettuce in comparison to sodium hypochlorite
Provedor de dados: 58
Autores: Bachelli,Mara Lígia Biazotto; Amaral,Rívia Darla Álvares; Benedetti,Benedito Carlos.
Lettuce is a leafy vegetable widely used in industry for minimally processed products, in which the step of sanitization is the crucial moment for ensuring a safe food for consumption. Chlorinated compounds, mainly sodium hypochlorite, are the most used in Brazil, but the formation of trihalomethanes from this sanitizer is a drawback. Then, the search for alternative methods to sodium hypochlorite has been emerging as a matter of great interest. The suitability of chlorine dioxide (60 mg L-1/10 min), peracetic acid (100 mg L-1/15 min) and ozonated water (1.2 mg L-1 /1 min) as alternative sanitizers to sodium hypochlorite (150 mg L-1 free chlorine/15 min) were evaluated. Minimally processed lettuce washed with tap water for 1 min was used as a control....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Food safety; Chlorine dioxide; Peracetic acid; Ozone; Minimal processing.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822013000300002

Anti-fungal potential of ozone against some dermatophytes
Provedor de dados: 58
Autores: Ouf,Salama A.; Moussa,Tarek A.; Abd-Elmegeed,Alshimaa M.; Eltahlawy,Samar R.
ABSTRACT Dermatophytes are classified in three genera, Epidermophyton, Microsporum and Trichophyton. They have the capacity to invade keratinized tissue to produce a cutaneous infection known as dermatophytoses. This investigation was performed to study the effect of gaseous ozone and ozonized oil on three specific properties of six different dermatophytes. These properties included sporulation, mycelia leakage of sugar and nutrients and the activity of their hydrolytic enzymes. Generally, ozonized oil was found to be more efficacious than gaseous ozone. Microsporum gypseum and Microsporum canis were the most susceptible, while Trichophyton interdigitale and T. mentagrophytes were relatively resistant. The study revealed a steady decline in spore...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Dermatophytes; Dermatophytosis; Ozone; Hydrolytic enzymes; Ozonized oil.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822016000300697

The use of ozonized oil in the treatment of dermatophitosis caused by Microsporum canis in rabbits
Provedor de dados: 58
Autores: Daud,Fernanda Vasquez; Ueda,Suely Mitoi Ykko; Navarini,Alessandra; Mímica,Lycia Mara Jenné.
The ozone is effective against most microorganisms due to its high oxidant power. Low concentrations and short-term contact are sufficient to inactivate bacteria, mold, yeast, parasites, seaweeds, protozoa and fungi. Microsporum canis is an important agent of dermatophitosis in human and animal. The aim of the current study was to assess the efficacy of ozonized oil over Microsporum canis in rabbits. Eighteen male New Zealand white rabbits, weight ranging from 2 to 3.2 kg were depilated in the cranial dorso-lateral and right caudal, and cranial and left caudal regions. The regions were inoculated with Microsporum canis, excepting the right caudal region, and were denominated TM, O, OM and M, respectively. After seven days, the treatment of lesions in TM...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fungi; Microsporum; Oils; Ozone; Rabbits.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822011000100035

Influence of pH on the efficacy of ozonated water to control microorganisms and its effect on the quality of stored strawberries (Fragaria x ananassa Duch.)
Provedor de dados: 64
Autores: Ferreira,Wallas Felippe de Souza; Alencar,Ernandes Rodrigues de; Alves,Hanna; Ribeiro,Jaqueline Lamounier; Silva,Caroline Rosa da.
ABSTRACT Ozonation has been proposed as an alternative for the post-harvest treatment of plant products. Therefore, the objective of this study was to evaluate the influence of the pH on the efficacy of ozonated water to control microorganisms and to determine the possible effects of ozone on the quality of stored strawberries. To evaluate the influence of pH on ozonated water in Portola variety strawberries, the strawberries were divided into six batches. Three batches were exposed to ozonated water and three batches were exposed to non-ozonized water with different pH levels and an immersion time of 5 min. The pH values used were 3.0, 6.5 and 8.7. After the ozonation, the fruits were stored in a cold chamber at 5 °C for 6 days, and analyses were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ozone; Microbiological quality; Qualitative changes.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542017000600692