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Registros recuperados: 34
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ALTERATION OF NITROGEN CYCLING BY AGRICULTURAL ACTIVITIES, AND ITS ENVIRONMENTAL AND HEALTH CONSEQUENCES Gayana Botánica
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
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Alternative sanitization methods for minimally processed lettuce in comparison to sodium hypochlorite BJM
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
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Anti-fungal potential of ozone against some dermatophytes BJM
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
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Changes in PEP Carboxylase, Rubisco and Rubisco activase mRNA levels from maize (Zea mays) exposed to a chronic ozone stress Biol. Res.
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
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Comparison of White-rot Fungi and Ozone for Decolorization of Wastewater from Pulp and Paper Industry Thai Agricultural
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
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Controlling Ozone and Fine Particulates: Cost Benefit Analysis with Meteorological Variability AgEcon
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
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Dichlorvos (DDVP) residue removal from tomato by washing with tap and ozone water, a commercial detergent solution and ultrasonic cleaner Ciênc. Tecnol. Aliment.
HESHMATI,Ali; NAZEMI,Fatemeh.
Abstract Dichlorvos (DDVP) is one of the most consumption chlorinated organophosphate insecticide used on tomato. The knowledge about the influence of postharvest household processes on the levels of DDVP residues in vegetables is required to estimate dietary exposure. In this study, the removal of sprayed dichlorvos (DDVP) on tomato by washing with tap, ozonated water (in dosages of 2, 4 and 6 mg ozone/L), a commercial detergent solution (in concentration of 1, 2 and 3%) and ultrasonic cleaner (with power of 100, 200 and 300 W) was investigated. DDVP residue was determined by gas chromatography with electron capture detector. Washing processes led to the significant reduction of DDVP. The gradual increase in the percentage of the removal was observed due...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Dichlorvos; Pesticide; Ozone; Ultrasonic; Tomato.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-20612018000300441
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Distribución espacial e impacto de aeropoluantes en la salud del bosque de conservación del Distrito Federal. Colegio de Postgraduados
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
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Effect of oxidation–reduction potential on performance of European sea bass (Dicentrarchus labrax) in recirculating aquaculture systems ArchiMer
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
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Effect of the ozonization process on the quality of peanuts and crude oil AGRIAMBI
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
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Effectiveness evaluation of alternative sanitizers in microbiological quality of strawberry (Fragaria ananassa Duch Var. Oso Grande) after artificial contamination by Escherichia coli Ciênc. Tecnol. Aliment.
BASTOS,Renan Gomes; OLIVER,Josidel Conceição; GERMANO,Jaqueline de Lima; FERNANDES,Gislene Regina; VEIGA,Sandra Maria Oliveira Morais.
Abstract Washing and sanitization are considered particularly critical steps for the microbiological quality of fruits. At this stage, it is important to select the sanitizer which must have microbiological effectiveness. In the literature, there is a great interest on alternative sanitizers for microbiological quality control of food. This study aimed at verifying the effectiveness of sodium hypochlorite, ozone, ultrasound and citric acid as well as associations of ultrasound to the other techniques mentioned above in the microbiological quality control of strawberries cv. Oso Grande. In these trials, the fruits were initially subjected to artificial contamination by a strain of Escherichia coli ATCC 25922 and thereafter part of them was reserved as...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Sanitization; Strawberries; Citric acid; Ultrasound; Ozone.
Ano: 2019 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-20612019000600470
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Effects of ozone on lignin-derived compounds in pulp and paper mill effluent Thai Agricultural
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
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Eggshell microbiology and quality of hatching eggs subjected to different sanitizing procedures PAB
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
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Estimación de Tendencias en Niveles Máximos de Contaminación usando Regresión por Cuantiles a justando el efecto por variables meteorológicas Colegio de Postgraduados
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
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Estimación de tendencias en niveles máximos de contaminación usando regresión por cuantiles ajustando el efecto por variables meteorológicas Colegio de Postgraduados
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
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Evaluation of the thermo-assisted drying and decontamination system and ozone gas for sanitation of livestock transport vehicles. In: INTERNATIONAL PIG VETERINARY SOCIETY CONGRESS, 25., 2018, Chongqing. Repositório Alice
SATO, J. P. H.; PIGOZZO, R.; BRANDALISE, L.; LIMA, G. F. R.; CERIZOLLI, R.; KUCHIISHI, S. S.; KICH, J. D.; SIMÃO, G. M. R..
bitstream/item/179893/1/final8899.pdf
Tipo: Resumo em anais de congresso (ALICE) Palavras-chave: Total coliforms; Sanidade Animal; Transporte; Biossegurança; Coliforme; Desinfecção; Ozônio; Animal health; Animal transport; Biosecurity; Disinfection; Ozone.
Ano: 2018 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1093351
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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.) Ciência e Agrotecnologia
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
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Modelación de eventos extremos usando la distribución Dagum. Colegio de Postgraduados
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
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Modelación de eventos extremos usando la distribución Dagum. Colegio de Postgraduados
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
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Ozonated water in the post-harvest treatment of coffee fruits AGRIAMBI
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
Registros recuperados: 34
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