Consulta: subjectFacets:"Degradation"
Registros recuperados: 95
Data/hora: 10/06/2024 10:07:42

Crecimiento de cuatro cepas del género Rhizobium en presencia de hidrocarburos policíclicos aromáticos (HPA).
Provedor de dados: 32
Autores: González Paredes, Yessica.
Este estudio evaluó el crecimiento de cuatro cepas de Rhizobium en medio contaminado con fenantreno (PHE) o benzo[a]pireno (BaP) en concentraciones de 0, 10, 20, 40, 60, 80 y 100 µg mL-1. En la primera fase experimental, R. tropici CIAT899, R. tropici PRF81, R. leucaena CFN299 y R. etli CFN42 crecieron en condiciones in vitro o en simbiosis con Phaseolus vulgaris L. en presencia de PHE y BaP. El crecimiento in vitro de las cuatro cepas a las 24 h, disminuyó al aumentar las concentraciones de ambos HPA; sin embargo, el BaP fue más tóxico para su crecimiento. Las cuatro cepas ante 80 y 100 µg BaP mL-1 presentaron una fase de adaptación; para CIAT899 y PRF81 esta fase fue de 48 h, y para CFN299 y CFN42 esta fase fue de 72 y 96 h, respectivamente. La simbiosis...
Palavras-chave: Rizobios; Tolerancia; Adaptación; Simbiosis; Degradación; Fenantreno; Benzol [a] pireno; Rhizobia; Tolerance; Adaptation; Symbiosis; Degradation; Phenanthrene; Benzol [a] pyrene; Edafología; Maestría.
Ano: 2012
URL: http://hdl.handle.net/10521/1704

Evaluación del hongo Fomes sp. EUM1 en los residuos de cosecha mecanizada de la caña de azúcar.
Provedor de dados: 32
Autores: Olivera de la Cruz, Alex Ricardo.
La caña de azúcar representa una alternativa viable para contrarrestar la escasez de forrajes en temporadas de nortes y/o secas, ya que se produce en promedio 18.2 Ton/MS/ha-1 de residuos por parcela. Con el uso de la biotecnología se han desarrollado diferentes alternativas para la reducción de los componentes fibrosos e incrementar la degradación de los forrajes de baja calidad, destacando la utilización de bacterias, levaduras, hongos y enzimas. Por lo que el objetivo del presente trabajo fue evaluar la degradación de los residuos fibrosos de la caña de azúcar utilizando un tratamiento biológico a través del Hongo Fomes sp. EUM1, se estudió un diseño completamente al azar con arreglo factorial 3 tiempos de crecimiento (7, 10 y 13 días) y el segundo...
Palavras-chave: Hongo fomes sp. EUM1; Residuos de cosecha de caña; Degradación; Fungus fomes sp. EUM1; Cane crop residue; Degradation; Producción Agroalimentaria en el Trópico; Maestría.
Ano: 2013
URL: http://hdl.handle.net/10521/1898

Diagnóstico de la cuenca de la presa Madín, Estado de México.
Provedor de dados: 32
Autores: Castro Mendoza, Itzel.
Se presenta el diagnóstico de degradación de la cuenca de la presa Madín a través de la metodología Assesment of the Status of Human-Induced Soil Degradation (ASSOD). La presa Madín se encuentra en el Estado de México entre los municipios de Atizapán de Zaragoza y Naucalpan de Juárez; corresponde a la región hidrológica 26 Pánuco, en la Cuenca del Valle de México, Subcuenca Ciudad de México, por lo que la unidad de drenaje rematada en la presa corresponde a la categoría jerárquica de microcuenca y sus subsecuentes delimitaciones inferiores a unidades hidrográficas. Se delimitan en total cinco unidades hidrográficas (UH) a las cuales se les calculan los parámetros de caracterización hidrográfica y se determinan sus características biofísicas y...
Palavras-chave: ASSOD; Cuenca; Degradación; EUPS; USPED; Basin; Degradation; USLE; Hidrociencias; Maestría.
Ano: 2012
URL: http://hdl.handle.net/10521/1740

Parámetros de Transporte de Atrazina en un Andosol y un Vertisol de México
Provedor de dados: 32
Autores: Raymundo Raymundo, Elías.
Atrazina es el herbicida más utilizado en el mundo y el tercer herbicida más utilizado en México.  Atrazina tiene potencial cancerígeno en humanos. En varias partes del mundo esta sustancia se  ha detectado en aguas superficiales y subterráneas a niveles que rebasan las concentraciones  máximas permisibles para agua potable. Se ha realizado el presente estudio con la finalidad de  entender las particularidades de transporte de atrazina a través del perfil de un Andosol y un  Vertisol mexicanos y obtener los parámetros de transporte, los cuales permiten simular el  proceso de migración y mejorar las estrategias de aplicación para prevenir la contaminación  ambiental. Bajo condiciones de laboratorio, se condujeron columnas intactas y empacadas de  suelos...
Tipo: Tesis
Palavras-chave: Velocidad; Degradación; Adsorción; Columnas intactas y empacadas; Retardo; Doctorado; Hidrociencias; Velocity; Degradation; Adsorption; Intact and packed columns; Retardation.
Ano: 2008
URL: http://hdl.handle.net/10521/1308

La ecotoxicidad y el pasto japonesa (Leersia sp.) en la fitorremediación de un Gleysol contaminado con petróleo fresco, intemperizado y sulfatos.
Provedor de dados: 32
Autores: Arias Trinidad, Alfredo.
El estudio de ecotoxicidad y fitorremediación de un Gleysol (GL) contaminado con petróleo fresco (PF) e intemperizado (PI) y sulfatos solubles (S-SO4), se realizo para seleccionar indicadores de toxicidad biológicos, evaluar el potencial del pasto japonesa (PJ) en la descontaminación de estos suelos, la presencia de S-SO4 en su interacción con los hidrocarburos, las bacterias sulfato reductoras y actividad enzimática de la arilsulfatasa (ASA). Dos GLs se usaron para establecer los bioensayos (BIO). El BIO1 con nueve tratamientos [T1: 2 607 (biogénico), T2: 6 000, T3: 10 000, T4: 30 000, T5: 60 000, T6: 90 000, T7: 120 000. T8: 150 000 y T9: 180 000 mg kg-1 suelo seco de hidrocarburos totales de petróleo fresco (HTPF)]. El BIO2 con seis tratamientos [T1: 2...
Palavras-chave: Petróleo; Sulfatos; Bacterias; Enzimas; Degradación; Maestría; Producción Agroalimentaria en el Trópico; Oil; Sulfates; Enzymes; Degradation.
Ano: 2012
URL: http://hdl.handle.net/10521/1762

Evaluación nutricional de harina de nopal en dietas para borregos.
Provedor de dados: 32
Autores: Muciño Castillo, Gabriela.
La deshidratación del nopal es un método de conservación para alargar su vida útil y para mejorar su utilización como forraje en la alimentación de borregos. Los objetivos de este estudio fueron evaluar: 1) el contenido nutrimental, la degradación de la MS y la producción de gas in vitro de harinas de Opuntia robusta, Opuntia ficus indica var Copena F1, Opuntia albicarpa var Blanca San Martín, Opuntia megacantha var Roja San Martín y Opuntia ficus indica var Atlixco, y de dietas totalmente mezcladas conteniendo 0, 25 o 50 % (tratamientos) de harina de nopal (HN); 2) la respuesta productiva de 24 borregos Rambouillet (26.1±2.1 PV) alimentados con las tres dietas. El diseño experimental fue completamente al azar, los datos se analizaron con el procedimiento...
Palavras-chave: Harina de nopal; Dietas para borregos; In vitro producción de gas; Degradación; Dried prickly pear cactus; Diets for lambs; In vitro gas production; Degradation; Ganadería; Maestría.
Ano: 2014
URL: http://hdl.handle.net/10521/2305

Respuestas de Leucaena leucocephala en simbiosis con Rhizobium y/o micorriza en diferentes etapas de desarrollo durante la fitorremediación de fenantreno.
Provedor de dados: 32
Autores: Villegas Velázquez, Itzel.
En este estudio se evaluó la respuesta de semillas y plántulas de Leucaena leucocephala ante fenantreno (FEN), y el potencial de fitorremediación de FEN por la simbiosis tripartita Rhizobiun-Leucaena-Glomus, mediante el planteamiento de dos fases experimentales. En la primera fase, se evaluó el efecto de tres dosis de FEN (60, 80 y 100 mg L-1) y la inoculación de Rhizobium tropici CIAT 899 en semillas y desarrollo inmediato (10 días) de las plántulas de Leucaena. El FEN no afectó la conductividad eléctrica ni la germinación de semillas, mientras que Rhizobium estimuló la germinación únicamente a las 32 h. El FEN estimuló la longitud radical, pero redujo la longitud del tallo, inhibió la proliferación de pelos radicales y causó lesiones necróticas en...
Palavras-chave: Germinación; Desarrollo de plántulas; Actividad antioxidante; Compuestos fenólicos; Degradación; Germination; Seedling growth; Antioxidant activity; Phenolic compounds; Degradation; Maestría; Fisiología Vegetal.
Ano: 2011
URL: http://hdl.handle.net/10521/516

Caracterización del valor nutritivo de cinco especies de leguminosas del género Lupinus.
Provedor de dados: 32
Autores: Pablo Pérez, Maricela.
El objetivo del presente estudio fue conocer el potencial nutricional para la alimentación animal de cinco especies de Lupinus (L. montanus, L. exaltatus, L. campestris, L. hintonii, y Lupinus sp.). Plantas completas en floración (componente follaje) y fructificación (componentes: vainas y semillas) fueron recolectadas en la Región de Valles y Libres del Serdán, Puebla, durante julio y agosto de 2010, a una altitud entre 2486 y 3442 m. Los análisis realizados por componente fueron proteína cruda (PC), extracto etéreo (EE), cenizas (Ce), fibra detergente neutro (FDN), fibra detergente ácido (FDA), alcaloides totales (Alc), polifenoles totales (Pt), taninos condensados (Tc), degradación in situ de MS, MO, PC, FDN y FDA, composición mineral de semillas y su...
Palavras-chave: Lupinus; Leguminosa; Silvestre; Valor nutritivo; Composición química; Degradación; Legumes; Wild; Nutritive value; Chemical composition; Degradation; Producción Agroalimentaria en el Trópico; Maestría.
Ano: 2013
URL: http://hdl.handle.net/10521/1869

Evaluación de la degradación efectiva y el comportamiento productivo de ovinos de pelo alimentados con sacchamaiz.
Provedor de dados: 32
Autores: Godínez Juárez, Beatriz.
El objetivo de este trabajo fue el evaluar el efecto de inclusión de maíz (0, 10, 20, 30 y 40%) en alimentos a base de caña de azúcar fermentada en la degradación efectiva (DE) y el peso de ovinos de pelo corto. Las dietas, Saccharina, Saccharina +10, 20, 30, y 40% de maíz, fueron evaluadas. La DE e in situ de la material seca (MS) y la fibra detergente neutra (FDN) fueron evaluadas de acuerdo a un diseño completamente al azar con arreglo factorial. Se evaluó el consumo voluntario y la ganancia de peso en 24 ovinos (Kathadin x Pelibuey), de un peso promedio de 17 ±3 kg, con un arreglo completamente al azar. Con excepción de DE de MS y la tasa de degradación, el tratamiento al 10% presentó los niveles más altos de degradación in situ (MS=75.90%,...
Palavras-chave: Alimentación de ovinos; Degradación; Crecimiento animal; Ingestión voluntaria; Sheep feeding; Degradation; Animal growth; Voluntary intake; Producción Agroalimentaria en el Trópico; Maestría.
Ano: 2014
URL: http://hdl.handle.net/10521/2244

Respuestas de Leucaena leucocephala en simbiosis con Rhizobium y/o micorriza en diferentes etapas de desarrollo durante la fitorremediación de fenantreno.
Provedor de dados: 32
Autores: Villegas Velázquez, Itzel.
En este estudio se evaluó la respuesta de semillas y plántulas de Leucaena leucocephala ante fenantreno (FEN), y el potencial de fitorremediación de FEN por la simbiosis tripartita Rhizobiun-Leucaena-Glomus, mediante el planteamiento de dos fases experimentales. En la primera fase, se evaluó el efecto de tres dosis de FEN (60, 80 y 100 mg L-1) y la inoculación de Rhizobium tropici CIAT 899 en semillas y desarrollo inmediato (10 días) de las plántulas de Leucaena. El FEN no afectó la conductividad eléctrica ni la germinación de semillas, mientras que Rhizobium estimuló la germinación únicamente a las 32 h. El FEN estimuló la longitud radical, pero redujo la longitud del tallo, inhibió la proliferación de pelos radicales y causó lesiones necróticas en...
Palavras-chave: Germinación; Desarrollo de plántulas; Actividad antioxidante; Compuestos fenólicos; Degradación; Germination; Seedling growth; Antioxidant activity; Phenolic compounds; Degradation; Maestría; Fisiología Vegetal.
Ano: 2011
URL: http://hdl.handle.net/10521/516

Lixiviación de atrazina en un vertisol del Bajío de Guanajuato, México
Provedor de dados: 32
Autores: Hernández Vargas, Juan.
La aplicación de plaguicidas en las áreas agrícolas puede causar contaminación ambiental. Por lo general los estudios sobre migración de plaguicidas en los terrenos agrícolas se realizan a través del muestreo periódico del suelo, agua y plantas. Tal enfoque es caro (150.00 USD solamente por análisis de un grupo químico de plaguicidas) y frecuentemente no permite pronosticar el nivel de contaminación potencial a futuro. Existen métodos para minimizar el costo de las investigaciones en campo a través de simulación matemática de los procesos de migración de plaguicidas ante todo en el suelo. Para aplicar estos métodos es necesario conocer algunos parámetros de transporte de plaguicidas en perfil del suelo. En el presente trabajo se realizaron experimentos...
Tipo: Tesis
Palavras-chave: Herbicida; Dispersividad; Velocidad; Degradación; Contaminación; Maestría; Hidrociencias; Herbicide; Dispersivity; Velocity; Degradation; Contamination.
Ano: 2008
URL: http://hdl.handle.net/10521/1633

Extractos enzimáticos fibrolíticos de Fomes sp. EUM1 y Cellulomonas flavigena en la alimentación de corderos.
Provedor de dados: 32
Autores: Torres Salado, Nicolás.
Se realizaron tres experimentos para evaluar el efecto de extractos enzimáticos fibrolíticos en el forraje de una dieta integral para corderos. En el primer experimento se evaluaron tres extractos de por su efecto en el crecimiento y la digestibilidad del alimento en corderos, utilizando dietas con 60 % de forraje (30 % rastrojo de maíz y 30 % heno de alfalfa). El diseño experimental fue completamente al azar, se usaron 20 corderos Pelibuey (peso inicial 26.14 kg) y para los tratamientos se adicionaron extractos enzimáticos (mL kg-1 materia seca, MS, de alimento): testigo (0 mL), 3.5 mL de extracto comercial de Trichoderma longibrachiatum, 21.1 mL de extracto de Fomes sp. EUM1 y 2.47 mL de extracto de Cellulomonas flavigena. Se realizó un ANOVA y las...
Palavras-chave: Enzimas fibrolíticas exógenas; Cellulomonas flavigena; Fomes sp.; EUM1; Consumo materia seca; Digestibilidad; Forraje; Ovinos; Exogenous fibrolytic enzymes; Dry matter intake; Degradation; Forage; Sheep; Ganadería; Doctorado.
Ano: 2013
URL: http://hdl.handle.net/10521/1903

Bridging the Gap Between Economics and Ecology
Provedor de dados: 7
Autores: Leefers, Larry; Michigan State University; leefers@pilot.msu.edu; Castillo, Gem; Michigan State University; Castil16@pilot.msu.edu.
Economics and ecology are often presented as opposing disciplines. Both fields have strengths and weaknesses. A new transdisciplinary field, ecological economics, attempts to bring together the strengths of both disciplines with a vision for a sustainable future. In this paper, we focus on one particular concept championed by ecological economists, natural capital. In particular, our interest is on the institutionalization of this concept through the United Nation's Satellite System for Integrated Environmental and Economic Accounting (SEEA). SEEA is an international convention that incorporates natural resource accounting as a complement to the traditional System of National Accounts (SNA). In the case of boreal forests, the stocks and flows of forest...
Tipo: Peer-Reviewed Reports
Palavras-chave: Boreal forest; Circumpolar resources; Degradation; Depletion; Ecological economics; Michigan; Natural capital; Natural resources accounting; SEEA; Sustainability; United Nations Environment Programme; World Bank.
Ano: 1998

Robustness and Resilience across Scales: Migration and Resource Degradation in the Prehistoric U.S. Southwest
Provedor de dados: 7
Autores: Anderies, John M; School of Human Evolution and Social Change and School of Sustainability, Arizona State University, USA; m.anderies@asu.edu; Hegmon, Michelle; School of Human Evolution and Social Change  Arizona State University, USA; Michelle.Hegmon@asu.edu.
Migration is arguably one of the most important processes that link ecological and social systems across scales. Humans (and other organisms) tend to move in pursuit of better resources (both social and environmental). Such mobility may serve as a coping mechanism for short-term local-scale dilemmas and as a means of distributing organisms in relation to resources. Movement also may be viewed as a shift to a larger scale; that is, while it may solve short-term local problems, it may simultaneously have longer term and larger scale consequences. We conduct a quantitative analysis using dynamic modeling motivated by an archaeological case study to explore the dynamics that arise when population movement serves as a link between spatial scales. We use the...
Tipo: Peer-Reviewed Reports
Palavras-chave: Degradation; Migration; Natural resources; Resilience; Vulnerability.
Ano: 2011

Resource degradation, marginalization, and poverty in small-scale fisheries: threats to social-ecological resilience in India and Brazil
Provedor de dados: 7
Autores: Nayak, Prateep K.; Faculty of Environment, University of Waterloo; pnayak@uwaterloo.ca; Oliveira, Luiz E.; Natural Resources Institute, University of Manitoba; oliveira_lec@yahoo.com.br; Berkes, Fikret; Natural Resources Institute, University of Manitoba; Fikret.Berkes@ad.umanitoba.ca.
Tipo: Peer-Reviewed Reports
Palavras-chave: Brazil; Degradation; Disempowerment; Exclusion; Exploitation; Fisheries; Human-environment disconnect; Identity; Impoverishment; India; Marginalization; Poverty; Resilience; Small-scale fishery; Social-ecological system.
Ano: 2014

IDENTIFICATION OF DESERTIFICATION- SENSITIVE AREAS IN THE BRAZILIAN NORTHEAST THROUGH VEGETATION INDICES
Provedor de dados: 70
Autores: Ferreira,Thomás R.; Pace,Frederico T. Di; Silva,Bernardo B. Da; Delgado,Jéssica R.
ABSTRACT: The aim of this study was to identify areas susceptible to drought and under desertification in the Brazilian Northeast, more specifically in the states of Alagoas, Pernambuco, and Sergipe. The study was based on the 2000-2014 time period, relative frequency, Vegetation Condition Index (VCI) dataset derived from MOD13Q1 products (vegetation indices derived from the Moderate Resolution Imaging Spectroradiometer sensor). The areas located within the desertification nucleus of Cabrobó, in the southwestern of Pernambuco and surrounding the Águas Belas municipality were considered susceptible to drought and desertification. Some municipalities in the countryside of Alagoas showed a very low relative frequency of VCI data (45-50%), and occurrence of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Degradation; Vegetation; Remote sensing.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162017000601190

Atrazine bound residues formation and dissipation in subtropical soil under swine wastewater application
Provedor de dados: 70
Autores: Gonçalves,Morgana S.; Sampaio,Silvio C.; Coelho,Silvia R. M.; Suszek,Floriano L.; Cordovil,Claudia M. D. S.
The effects of swine wastewater on atrazine dissipation and formation of bound residues in subtropical clay soil were investigated in this study. The experiment was carried out in laboratory, under room conditions, where samples of Rhodic Hapludox soil received 168.61 mg kg-1 of atrazine and were incubated for 60 days in the following treatments: T1 (sterilized soil + swine wastewater), T2 (sterilized soil + distilled water), T3 (Non sterilized soil + swine wastewater) and T4 (Non sterilized soil + distilled water). The extractable residues and bound residues of atrazine were extracted and analyzed by high performance liquid chromatography. The results showed no effect of swine wastewater on atrazine dissipation. However, the addition of swine wastewater...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Herbicide; Degradation; Sorption; Organic matter.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162012000600017

Compostagem de resíduos da produção e abate de pequenos ruminantes.
Provedor de dados: 14
Autores: OLIVEIRA, E. L. de; RODRIGUES, G. de S.; SANTIAGO, L. B.; SOUZA, H. A. de.
A compostagem se enquadra no processo biológico de reciclagem de nutrientes e surge como uma alternativa viável por reduzir o peso e o volume dos resíduos gerados. A compostagem é uma técnica de decomposição e sanitização da matéria orgânica à alta temperatura, pela ação de bactérias e fungos que transformam as carcaças em um produto útil, denominado de composto orgânico. Essa técnica é acessível ao produtor rural e as agroindústrias, tais como frigoríficos e abatedouros. O composto orgânico é um adubo que pode ser utilizado em áreas agrícolas, conforme Instrução Normativa nº 25 de 2009 do Ministério da Agricultura, Pecuária e Abastecimento, que trata da produção e do uso de compostos orgânicos. O uso de composto orgânico apresenta as vantagens de reduzir...
Tipo: Fôlder / Folheto / Cartilha (INFOTECA-E)
Palavras-chave: Resíduo de carcaça; Carcass utilization; Carcasses; Waste.; Composto orgânico; Compostagem; Matéria orgânica; Decomposição; Manejo; Caprino; Ovino; Organic compounds; Composting; Organic matter; Degradation; Goats; Sheep.
Ano: 2015
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1019361

Plano de recuperação de áreas degradadas do aproveitamento hidrelétrico (ahe) Corumbá, Goiás.
Provedor de dados: 14
Autores: SILVA, S. P. C.; CAVALCANTI, T. B.
bitstream/item/130276/1/PlanodeRecupdeareaPRADCOR.pdf
Tipo: Outras publicações técnicas (INFOTECA-E)
Palavras-chave: Area degradada; Recuperacao; Brasil; Corumba; Goias; Recuperation; Hydroeletric.; Hidrelétrica.; Area; Degradation; Brazil.
Ano: 1996
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/171625

Metodologias para mapeamento de pastagens degradadas no cerrado.
Provedor de dados: 14
Autores: SANO, E. E.; BEZERRA, H. da S.; BARCELLOS, A. de O.; ROSA, R.
RESUMO: Desde o início da década de 1970, o Bioma Cerrado vem sendo intensamente ocupado para a produção de carne bovina. Segundo dados do Censo Agropecuário do IBGE de 1995/1996, nesse ecossistema, existem 49,5 milhões de hectares de pastagens cultivadas concentradas nos Estados de Goiás (14.150.900 hectares), Mato Grosso do Sul (11.970.463 hectares) e Mato Grosso (8.884.790 hectares). A maioria das pastagens cultivadas do Cerrado vem apresentando níveis alarmantes de degradação, requerendo a implementação de um programa racional e economicamente viável de recuperação. Visando a fornecer subsídios para um programa dessa natureza,nesse estudo, avaliou-se a possibilidade de identificar os principais tipos de pastagens cultivadas do Cerrado e os seus...
Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E)
Palavras-chave: Degradação; Feed grasses.; Cerrado; Gramínea Forrageira; Pastagem Cultivada; Pastagem; Sensoriamento Remoto.; Degradation; Remote sensing; Pastures; Sown pastures.
Ano: 2002
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/559112

Influencia das atividades antropicas sobre os peixes da bacia hidrografica do rio Miranda, periodo de 1985 a 1987.
Provedor de dados: 14
Autores: RESENDE, E. K. de.
Face ao grande impacto causado pela mortandade macica de peixes ocorrida no rio Miranda em outubro de 1985, observada na regiao do Passo do Lontra, foi desenvolvido este trabalho, a partir de informacoes secundarias, com o objetivo de avaliar as possiveis fontes de contaminacao/degradacao existentes na bacia. As possiveis fontes provenientes do uso de defensivos agricolas, do uso da terra para as diferentes atividades agropastoris bem como as atividades industriais e o Impacto dos aglomerados urbanos na regiao foram avaliados. E parte de um projeto maior onde se efetua a caracterizacao limnologica da bacia e os estudos bio-ecologicos das principais especies de peixes de importancia comercial.
Tipo: Documentos (INFOTECA-E)
Palavras-chave: Mortandade; Ecofauna; Contamination.; Agrotóxico; Impacto Ambiental; Peixe.; Pantanal; Agrochemicals; Degradation; Fish; Mortality.
Ano: 1995
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/787793

Quantificacao e modelagem da dinamica de decomposicao de residuos de especies de adubos verdes no cerrado.
Provedor de dados: 14
Autores: SOUSA JUNIOR, J. G.; CARDOSO, A. N.; SILVA, F. A. M.; CARVALHO, A. M.; SCOPEL, E.
bitstream/CPAC-2009/24432/1/p2003_34.pdf
Tipo: Fôlder / Folheto / Cartilha (INFOTECA-E)
Palavras-chave: Residues; Zero tillage.; Adubo Verde; Cerrado; Decomposição; Plantio Direto; Resíduo.; Green manures.; Degradation.
Ano: 2004
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/566058

Pastagens no cerrado: baixa produtividade pelo uso limitado de fertilizantes.
Provedor de dados: 14
Autores: MARTHA JUNIOR, G. B.; VILELA, L.
bitstream/CPAC-2009/23083/1/doc_50.pdf
Tipo: Documentos (INFOTECA-E)
Palavras-chave: Degradacao; Pecuaria de corte; Forage plants; Pasture; Management.; Adubação; Cerrado; Fertilidade do Solo; Manejo; Pecuária; Pastagem; Planta Forrageira.; Beef cattle; Degradation; Fertilizer application; Soil fertility.
Ano: 2002
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/566479

Recuperação e melhoramento de pastagens cultivadas em área de floresta amazônica.
Provedor de dados: 14
Autores: SERRÃO, E. A. S.; HOMMA, A. K. O.
bitstream/item/57650/1/DOCUMENTOS-17-CPATU.pdf
Tipo: Documentos (INFOTECA-E)
Palavras-chave: Recuperação; Degradação; Brasil; Pasture; Recuperation; Nutrient; Forest.; Floresta; Melhoramento; Pastagem; Nutriente; Solo.; Amazonia; Breeding; Degradation; Soil.
Ano: 1982
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/382267

Soil fauna and litter decomposition in primary and secondary forests and a mixed culture system in Amazonia.
Provedor de dados: 14
Autores: HÖFER, H.; MARTIUS, C.; BECK, L.; GARCIA, M. V. B.
Este relatório representa um relato das atividades efetuadas no segundo ano do projeto como também dos resultados obtidos dos dados de 1997-1998 e da primeira serie de experimentos de decomposição com sacos de liteira (serrapilheira). Baseado nos resultados ainda preliminares, as áreas de estudo podem ser organizadas numa série, começando da área de floresta primária FLO via um dos locais de plantação, POC, até o local de floresta secundária, SEC, e o segundo local de plantação, POA.
Tipo: Fôlder / Folheto / Cartilha (INFOTECA-E)
Palavras-chave: Brasil; Amazonas; Manaus; Tropical rain forest; Decomposição; Floresta Tropical Úmida; Matéria Orgânica; Solo; Degradation; Organic matter; Soil.
Ano: 1998
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/668179

Soil fauna and litter decomposition in primary and secondary forests and a mixed culture system in Amazonia.
Provedor de dados: 14
Autores: SHIFT PROJECT ENV 52.
The first months of the year were dedicated to preparatory work in Germany and in Brazil. In July we finished the unexpectedly time-and cost-intensive installation of a generator and no break system to maintain the functioning of extraction and analyzing equipment (Kempson and Berlese-extractor, C/N-analyzer and Infra-Red-Gasanalyzer IRGA) during the very frequent breakdowns of the power supply in the laboratory of the EMBRAPA institute. On 23/24 July the joint "central sampling program of macro-and mesofauna, oligochaeta and microflora which includes field and laboratory work was successfully tested. On 27 october the first litterbag series with 1008 litterbags containing air-dried Vismia-litter to evaluate site-specific decomposition rates was...
Tipo: Fôlder / Folheto / Cartilha (INFOTECA-E)
Palavras-chave: Brasil; Amazonas; Tropical rain forest; Cultivo Multiplo; Decomposição; Fauna Edáfica; Floresta Tropical Úmida; Matéria Orgânica; Degradation; Forest litter; Multiple cropping; Soil fauna.
Ano: 1998
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/667795

Comportamento ambiental de dois inseticidas em um solo de Mato Grosso do Sul: experimentação e modelagem matemática.
Provedor de dados: 14
Autores: SCORZA JUNIOR, R. P.; RIGITANO, R. L. de O.; FRANCO, A. A.
Informações sobre o comportamento de pesticidas são importantes para o conhecimento do seu destino ambiental e, consequentemente, para a avaliação da sustentabilidade dos sistemas de produção agrícolas. Este trabalho teve os seguintes objetivos: (i) quantificar a lixiviação de dois inseticidas (endossulfam e tiametoxam) em uma área de plantio de soja na região de Ponta Porã, MS; (ii) avaliar a degradação e sorção dos dois inseticidas no solo em estudo; e (iii) testar e calibrar os simuladores MACRO e PEARL para descrever os dados observados da lixiviação dos dois inseticidas nas condições consideradas. Amostras de solo para quantificação da lixiviação dos pesticidas foram coletadas nas profundidades de 0-10 cm, 10-30 cm, 30-50 cm, 50-70 cm e 70-100 cm aos...
Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E)
Palavras-chave: Degradação do solo.; Lixiviação.; Degradation; Leaching; Soil.
Ano: 2010
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/880300

Soil fauna and litter decomposition in primary and secondary forests and a mixed culture system in Amazonia.
Provedor de dados: 14
Autores: SHIFT PROJECT ENV 52 (Manaus-AM).
Estudo sobre a fauna do solo e decomposicao da serapinheira feito em tres diferentes ecossistemas na Amazonia central: (1) floresta primaria (FLO), (2) floresta secundaria (SEC), e (3) duas parcelas de cultivo misto (POA, POC). As pesquisas incluiram a avaliacao da producao e estoque de serapilheira, parametros do solo, fatores microclimaticos, abundancia e biomassa da fauna do solo, determinacao da respiracao no solo e biomassa microbiana, medidas das taxas de respiracao dos componenetes da fauna, e analises de micronutrientes. Apesar das diferencas observadas entre as areas de estudo, foi observado que em todas elas o sistema de decomposicao da serapilheira foi controlado pela macrofauna, e que, em todos os sistemas de cultivo estudados, as condicoes...
Tipo: Outras publicações técnicas (INFOTECA-E)
Palavras-chave: Brasil; Amazonas; Manaus; Sustainability; Agrossilvicultura; Conservação do Solo; Cultivo Multiplo; Decomposição; Desenvolvimento Sustentável; Fauna Edáfica; Fertilidade do Solo; Floresta Tropical Úmida; Serapilheira; Uso da Terra; Agroforestry; Degradation; Forest litter; Land use; Multiple cropping; Soil conservation; Soil fauna; Soil fertility; Tropical rain forests.
Ano: 1999
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/669549

A decomposição da matéria orgânica.
Provedor de dados: 14
Autores: DENICH, M.; BRANDINO, Z. G.; BLUM, E.
bitstream/item/57923/1/Doc40-p163-186.pdf
Tipo: Outras publicações técnicas (INFOTECA-E)
Palavras-chave: Biologia solo; Igarapé-Açu; Pará; Brasil.; Decomposição; Ecossistema; Matéria Orgânica.; Amazonia; Degradation; Ecosystems; Organic matter; Soil biology.
Ano: 1986
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/394727

Fixacao biologica de nitrogenio associada a pastagens de braquiaria e outras gramineas forrageiras.
Provedor de dados: 14
Autores: REIS JUNIOR, F. B. dos; TEIXEIRA, K. R. dos S.; REIS, V. M.
bitstream/CPAC-2009/24678/1/doc_52.pdf
Tipo: Documentos (INFOTECA-E)
Palavras-chave: Degradacao; Azospirullum; Feed grasses.; Capim Brachiaria; Fixação de Nitrogênio; Gramínea Forrageira; Pastagem.; Degradation; Pastures.
Ano: 2002
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/559174

Microrganismos de processos biológicos do solo: perspectiva ambiental.
Provedor de dados: 14
Autores: SIQUEIRA, J. O.; MOREIRA, F. M. de S.; GRISI, B. M.; HUNGRIA, M.; ARAUJO, R. S.
Organismos e processos biologicos do solo; Ciclagem dos elementos no solo; Aspectos biologicos da degradacao do solo; Reabilitacao de solos degradados.
Tipo: Capítulo em livro técnico (INFOTECA-E)
Palavras-chave: Microorganismos; Toxicidade do aluminio; Fixacao biologica do nitrogenio; Degradacao do solo; Brasil; Microorganism; Environmental; Biological nitrogen fixation; Mycorhiza.; Acidez; Ecologia; Matéria Orgânica; Micorriza; Microbiologia; Meio Ambiente; Solo.; Acidity; Degradation; Ecology; Brazil; Organic matter; Microbiology; Soil; Toxicity.
Ano: 1994
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/449290

Jatropha curcas cake: Detoxification process of Jatropha curcas cake.
Provedor de dados: 14
Autores: MENDONCA, S.
Degradation process of toxic compounds (phorbol esters) present in Jatropha curcas cake by cultivation of macrofungi, with formation of bioactive metabolites (polysaccharides, proteins, sterols, among others) in the pretreated biomass.
Tipo: Folders
Palavras-chave: Jatropha Curcas; Toxicity; Degradation; Cakes.
Ano: 2021
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/1132991

Integracao lavoura-pecuaria: atividades desenvolvidas pela Embrapa Cerrados.
Provedor de dados: 14
Autores: VILELA, L.; MIRANDA, J. C. C.; SHARMA, R. D.; AYARZA, M. A.
A regiao do Cerrado com 205 milhoes de hectares, em menos de tres decadas, transformou-se na principal area agricola do Brasil. Essa rapida transformacao foi possivel devido a investimentos expressivos do governo em infra-estrutura e programas de desenvolvimento para ocupar esse ecossistema aliados aos avancos tecnologicos em manejo de solo e selecao de cultivares adaptadas as condicoes edafoclimaticas da regiao. O crescimento da agricultura nessa regiao teve influencia positiva na geracao de riquezas e de empregos. No entanto, tem gerado impactos ambientais negativos como: compactacao, erosao e perda de materia organica do solo nos sistemas de cultivos anuais. Ao mesmo tempo, os problemas de degradacao de pastagens agravaram-se, sendo especialmente...
Tipo: Documentos (INFOTECA-E)
Palavras-chave: Degradacao; Plant production; Rotational cropping.; Cerrado; Lavoura; Manejo do Solo; Pecuária; Rotação de Cultura.; Animal production; Degradation; Soil management.
Ano: 1999
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/546469

Decomposicao de residuos organicos em capsulas porosas de ceramica e em sacos de tecido sintetico.
Provedor de dados: 14
Autores: DUBOC, E.; CEZAR, R. S.; SOUTO, L.; BARILLI, J.; BOAS, R. L. V.
bitstream/CPAC-2009/24434/1/p2003_45.pdf
Tipo: Fôlder / Folheto / Cartilha (INFOTECA-E)
Palavras-chave: Crop residue.; Adubação; Decomposição; Incubação; Resíduo Orgânico; Solo.; Fertilizer application; Degradation; Soil.
Ano: 2004
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/566352

Associação de bactérias promotoras de crescimento de plantas do gênero Azospirillum com diferentes espécies de brachiaria.
Provedor de dados: 14
Autores: REIS JÚNIOR, F. B. dos; TEIXEIRA, K. R. dos S.; URQUIAGA, S.; REIS, V. M.
ABSTRACT: The limitation of nitrogen is considered one of the most important factors to the pastures degradation. However there are evidences that pastures formed by some species of the genus Brachiaria could be benefit with the biological nitrogen fixation process (BNF), guaranteeing to these pastures higher longevity. The diazotrophic bacteria founded in association with these forage grasses were mainly species from the Azospirillum genus. The associations between these microrganisms and the plants are generally conditioned to the vegetation, therefore is possible that different genotypes of Brachiaria exercise a selective efffect on the populations of these, what could result in different BNF contributions. It was objectified to establish the influence...
Tipo: Documentos (INFOTECA-E)
Palavras-chave: Degredação.; Bactéria; Brachiaria; Fixação de Nitrogênio; Microbiologia do Solo; Pastagem.; Azospirillum amazonense; Degradation; Nitrogen fixation; Pastures; Microbiology; Soil.
Ano: 2003
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/567997

Soil termites in primary forest, secondary forest and an agroforestry plantation system in central Amazonia.
Provedor de dados: 14
Autores: MARTIUS, C.; GOMES, E.; GARCIA, M. V. B.
Litter and soil termites were collected with soil cores (21cm diameter) in a primary forest site, a secondary forest site and two sites of a polyculture plantation system in central Amazonia (Brazil), in three-monthly intervals from 1997 to 1999. Termite genus diversity, abundance and biomass all were highest in the primary forest. The values in the secondary forest were half those of the primary forest, and they were lowest in the plantation systems, indicating that the latter sites may suffer from functional constraints concerning the process of organic residue decomposition.
Tipo: Capítulo em livro técnico (INFOTECA-E)
Palavras-chave: Brasil; Amazonas; Manaus; Tropical rain forest; Agrossilvicultura; Biomassa; Cultivo Multiplo; Cupim de Montículo; Decomposição; Fauna Edáfica; Floresta Tropical Úmida; Isoptera; Matéria Orgânica; Serapilheira; Termitidae; Agroforestry; Biomass; Degradation; Forest litter; Multiple cropping; Organic matter; Soil fauna.
Ano: 1999
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/669561

Natural Degradation and Biodegradation of Poly(3-Hydroxybutyrate-co-3-Hydroxyvalerate) in Liquid and Solid Marine Environments
Provedor de dados: 5
Autores: Deroine, Morgan; Cesar, Guy; Le Duigou, Antoine; Davies, Peter; Bruzaud, Stephane.
In this study, natural degradation and biodegradation of poly(3-hydroxybuyrate-co-3-hydroxyvalerate) (PHBV) films were followed in different marine environments. First of all, ageing of PHBV films was investigated in natural seawater for 180 days and degradation was followed by means of weight loss measurements, scanning electron microscopy (SEM), differential scanning calorimetry and steric exclusion chromatography. In a second part, biodegradation tests were performed on PHBV powder, by following carbon dioxide (CO2) release(,) to highlight the PHBV bioassimilation of marine microorganisms. Three different marine environments were considered for biodegradation tests: a solid inoculum with foreshore sand, a solid-liquid inoculum with sand and seawater and...
Tipo: Text
Palavras-chave: PHBV; Natural ageing; Degradation; Biodegradation; Seawater.
Ano: 2015
URL: http://archimer.ifremer.fr/doc/00296/40735/42020.pdf

Ageing mechanism and mechanical degradation behaviour of polychloroprene rubber in a marine environment: Comparison of accelerated ageing and long term exposure
Provedor de dados: 5
Autores: Le Gac, Pierre-yves; Le Saux, V.; Paris, M; Marco, Y.
Polymers are widely used in marine environments due to their excellent properties and good weathering resistance. Despite this extensive use, their long term behaviour in such an aggressive environment is still not well known. To assess the polymer durability within reasonable durations, it is essential to perform accelerated ageing tests to accelerate the degradation kinetics but without any modification of the degradation process. This study therefore proposes and validates accelerated ageing tests to study marine ageing of a silica-filled chloroprene rubber (CR) used for offshore applications. Several accelerated ageing protocols are investigated for temperatures ranging from 20 to 80 degrees C in renewed natural seawater. The ageing consequences are...
Tipo: Text
Palavras-chave: Chloroprene rubber; Degradation; Sea water; Silica; Accelerated ageing; Natural ageing.
Ano: 2012
URL: http://archimer.ifremer.fr/doc/00073/18429/20232.pdf

Pheopigment dynamics, zooplankton grazing rates and the autumnal ammonium peak in a Mediterranean lagoon
Provedor de dados: 5
Autores: Collos, Yves; Husseini Ratrema, Julie; Bec, Béatrice; Vaquer, André; Hoai, Thong Lam; Rougier, Claude; Pons, Virginie; Souchu, Philippe.
The dilution technique was used to estimate chlorophyll and pheopigment, net and gross production as well as zooplankton grazing over a 12-month period in a coastal lagoon in Southern France. Chlorophyll a (Cha) based gross growth rates of phytoplankton ranged from undetectable in February to 2.6 day(-1) in June, corresponding to 3.8 divisions per day. Cha-based grazing rates ranged from undetectable in February to 1.1 d(-1) in June. The seasonal growth pattern of picoplankton was similar to that of the whole community, with a peak in July, corresponding to four divisions per day. Grazing processes represented from 20 to 150% of the phytoplankton daily growth, and the grazing pressure was stronger on small phytoplankton cells than on larger cells. Gross...
Tipo: Text
Palavras-chave: Zooplankton; Ammonium; Pheopigments; Degradation; Growth; Phytoplankton.
Ano: 2005
URL: http://archimer.ifremer.fr/doc/2005/publication-727.pdf

Contribution of electroactive humic substances to the iron-binding ligands released during microbial remineralisation of sinking particles
Provedor de dados: 5
Autores: Whitby, Hannah; Bressac, Matthieu; Sarthou, Geraldine; Ellwood, Michael J.; Guieu, Cécile; Boyd, Philip W.
Iron is a key micronutrient in seawater, but concentrations would be negligible without the presence of organic ligands. The processes influencing the ligand pool composition are poorly constrained, limiting our understanding of the controls on dissolved iron distributions. To address this, the release of iron and iron‐binding ligands during the microbial remineralisation of sinking particles was investigated by deploying in situ particle interceptor/incubator devices at subsurface sites in the Mediterranean Sea and Subantarctic. Analyses revealed the pool of released ligands was largely dominated by electroactive humic substances (74 ± 28%). The release of ligands during remineralisation ensured that concurrently released iron remained in solution, which...
Tipo: Text
Palavras-chave: Iron; Ligand; Humic; Remineralisation; Particle; Degradation.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00618/72981/72055.pdf

Effects of extraction method and storage of dry tissue on marine lipids and fatty acids
Provedor de dados: 5
Autores: Sardenne, Fany; Bodin, Nathalie; Metral, Luisa; Crottier, Anais; Le Grand, Fabienne; Bideau, Antoine; Brisset, Blandine; Bourjea, Jerome; Saraux, Claire; Bonhommeau, Sylvain; Kerzerho, Vincent; Bernard, Serge; Rouyer, Tristan.
Various protocols are currently used to study marine lipids, but there is a growing interest in working on dry samples that are easier to transport. However, reference protocols are still lacking for dry samples. In order to make recommendations on this use, lipid classes and fatty acids (FA) obtained from six analytical protocols using two different tissue states (dry vs wet) and three extraction methods (automat vs manual potter vs leaving the solvent to work on tissue) were compared. Three dry storage modes of tissue (freezer vs gas nitrogen vs dry room) during one and three months were also compared. These comparisons were made on seven marine species with different lipid profiles, including fishes, crustaceans and mollusks. Lipid classes and FA...
Tipo: Text
Palavras-chave: Degradation; Freeze-drying; Lyophilization; Lipid class; Marine animal; Protocol.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00467/57898/60189.pdf

Etude de la dégradation et de la toxicité de la roténone en milieu marin
Provedor de dados: 5
Autores: Marcaillou-le Baut, Claire.
The use of rotenone as a means of predators eradication is necessary for the success of shrimps culture. Because these compound is a fish toxicant, some precautions have to be tacken in order to avoid the contamination of marine environment by the residual waters ; so the dissipation and the toxicity have been studied together in laboratory and in field assays. It appears that a delay of 15 days should be respected : this time is required for a total disappearing of the residual toxicity.
Tipo: Text
Palavras-chave: Aquaculture crevette; Roténone; Toxicité; Dégradation; Shrimps culture; Rotenone; Toxicity; Degradation.
Ano: 1987
URL: http://archimer.ifremer.fr/doc/00138/24949/23042.pdf

Accelerated ageing of polylactide in aqueous environments: Comparative study between distilled water and seawater
Provedor de dados: 5
Autores: Deroine, Morgan; Le Duigou, Antoine; Corre, Yves-marie; Le Gac, Pierre-yves; Davies, Peter; Cesar, Guy; Bruzaud, Stephane.
Pollution of nature by plastics is a major environmental problem and the challenge for the future is to manage the lifetime of polymers better. The aim of this study is to establish a baseline on degradation mechanism and degradation kinetics for lifetime prediction of polylactide (PLA) in a marine environment. The ageing of PLA was accelerated by raising temperature in distilled water, filtered and renewed seawater and natural seawater. Samples were immersed in distilled water for six months at different temperatures (25, 30, 40 and 50°C) in order to evaluate the influence of temperature on PLA degradation kinetics and to predict lifetime. Then, samples were immersed in seawater both in the laboratory and at sea, in order to compare the effects of...
Tipo: Text
Palavras-chave: PLA; Accelerated ageing; Hydrothermal ageing; Degradation.
Ano: 2014
URL: http://archimer.ifremer.fr/doc/00173/28376/26689.pdf

Editorial: Plastic Pollution
Provedor de dados: 5
Autores: Galgani, Francois; Pham, Christopher Kim; Reisser, Julia.
Tipo: Text
Palavras-chave: Plastic; Pollution; Models; Microplastics; Degradation.
Ano: 2017
URL: https://archimer.ifremer.fr/doc/00400/51138/51910.pdf

Properties of aminopeptidase produced by Euglena pisciformis cultured with potato protein
Provedor de dados: 19
Autores: Yamamoto, Shinro; Nishimura, Tohru; Mino, Yosuke; 山本, 紳朗; 西村, 透; 美濃, 羊輔.
Palavras-chave: Alkylating agent; Aminopeptidase; Degradation; Euglena pisciformis; Potato; Protein; Sulfhydryl reagent.
Ano: 1997
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/1308

Euglena pisciformisによるバレイショ蛋白質の吸収機構
Provedor de dados: 19
Autores: Yamamoto, Shinro; Nishimura, Tohru; Mino, Yosuke.
Palavras-chave: Aminopeptidase; Degradation; Euglena pisciformis; Potato; Protein.
Ano: 1997
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/1307

Coral reef degradation in the Indian Ocean. Status reports and project presentation 2000
Provedor de dados: 20
The temperatures of the world’s oceans are increasing at an accelerating rate. Recent estimates indicate that the magnitude of these increases might be as much as several degrees over the next century and undoubtedly, the impacts of these changes on the Earth’s ecosystems are likely to become increasingly obvious. Coral reefs have already shown dramatic responses to the increasing ocean temperatures. Under normal temperature conditions, reef-building corals, which form the foundation of coral reefs, are living very near the maximum sea temperatures that they can tolerate. If they are exposed to even modest increases in sea temperatures, perhaps only 1° C - 2° C, they become stressed and often ‘bleach’. This bleaching of corals is a response to stress, and...
Tipo: Report
Palavras-chave: Coral reefs; Degradation.
Ano: 2000
URL: http://hdl.handle.net/1834/309

Antarctic Psychrophile Bacteria Screening for Oil Degradation and Their Degrading Characteristics.
Provedor de dados: 20
Autores: Zheng, Zhou; Jin, Qing; Miao, Jinlai; Liu, Fangming.
Two hydrocarbon degrading bacteria NJ276 and NJ341 were screened from 385 Antarctic marine bacteria and their degrading characteristics were studied. Diesel oil as sole carbon source was used in this study. The results showed that the oil degradation rates of Antarctic psychrophile bacteria NJ276 and NJ341 were 23.47 % and 32.15 %, respectively, after 20 days culturation at 5 °C, and the rates were 43.95 % and 62.47 % respectively after 20 days culturation at 15 °C. The oil degradation abilities were enhanced remarkably with the increasing culture temperature. GC - MSs indicated the residual oil contained C15 - C21 7 alkyls after degradation by NJ276, and C16, C17 and C18 3 alkyls after degradation by NJ341. The 16S rDNA gene sequences homology and...
Tipo: Journal Contribution
Palavras-chave: Hydrocarbons; Degradation; Bacteria.
Ano: 2008
URL: http://hdl.handle.net/1834/5879

Fertilidad y fecundidad de Montastraea annularis en un arrecifes degradado
Provedor de dados: 20
Autores: Alvarado-Ch., E.; Acosta, A.
Este estudio determinó el ciclo gametogénico, fecundidad y fertilidad de Montastraea annularis en el arrecife de isla Grande, archipiélago de Nuestra Señora del Rosario, uno de los arrecifes más degradados del Caribe colombiano. La población de estudio se caracteriza por poseer colonias medianas (alrededor de 3379 cm2), con mortalidad parcial en 27 % de los ramets y totoal en el 10 % de los mismos. Las colonias presentan un alto número de ramets pequeños producto de la fisión (76 % menores a 50 cm2). Basado en las características de la estructura de tallas de la población mencionada, el objetivo de esta investigación fue explicar el bajo reclutamiento registrado en la zona, a través de la respuesta reproductiva de una población con dominancia de ramets...
Tipo: Journal Contribution
Palavras-chave: Degradation; Fecundity; Fertility; Gametogenesis; Degradation; Gametogenesis; Fecundity; Fertility; Http://aims.fao.org/aos/agrovoc/c_2159; Http://aims.fao.org/aos/agrovoc/c_27931; Http://aims.fao.org/aos/agrovoc/c_15725; Http://aims.fao.org/aos/agrovoc/c_2862.
Ano: 2009
URL: http://hdl.handle.net/1834/3610

Coral Reef Degradation In The Indian Ocean
Provedor de dados: 20
The reports in this volume summarize the extent of damage to the coral reefs of the Indian Ocean caused by the elevated temperatures in 1998. Most of the reports also contain information on the status of reefs 6 to 12 months after the events of 1998, thus describing the fate of dead corals, the first signs of recovery in some areas, and the secondary damage to other organisms dependent on the reef, such as fish. A brief summary of the results is given here.
Tipo: Report
Palavras-chave: Coral reefs; Degradation.
Ano: 1999
URL: http://hdl.handle.net/1834/316

Estudio de la contaminación con hidrocarburos de un ecosistema de manglar en cayo Santa María, Jardines del Rey, Cuba
Provedor de dados: 20
Autores: Bermúdez Acosta, Jelvys; González Delgado, Alejandro; Castro Hernández, Yoelvis; Ortiz Guilarte, Eudalys; Núñez Moreira, Roberto; Oramas García, Julio; García García, Yaliany.
El propósito de esta investigación fue estudiar la contaminación de un ecosistema de manglar impactado con hidrocarburos en el sector centro sur de Cayo Santa María, Jardines del Rey, Cuba. Para el estudio de los indicadores microbiológicos y fisicoquímicos fue diseñado un muestreo estratificado, donde se seleccionaron dos estratos y diez estaciones de muestreo, considerando los patrones de flujos de marea en pleamar y bajamar, así como el impacto perceptible de la contaminación. La determinación de las poblaciones de microorganismos heterótrofos totales (BHT) y degradadores de petróleo (BDP) en agua y sedimentos se realizó por el método de conteo de colonias, expresadas como UFC·mL-1 o UFC· g-1 según la matriz de análisis. El contenido de hidrocarburos...
Tipo: Journal Contribution
Palavras-chave: ASW; Cuba; Degradation; Dispersion; Hydrocarbons; Microorganisms; Pollution.
Ano: 2014
URL: http://hdl.handle.net/1834/5912

Cambio temporal en la estructura de la comunidad coralina del área de Santa Marta - Parque Nacional Natural Tayrona (Caribe colombiano)
Provedor de dados: 20
Autores: Martínez, S.; Acosta, A.
Several predictions have been made, about magnitude and direction of temporal changes in the coral community structure, during the last decade. However, few studies have demonstrated it quantitatively. In order to document such changes, the coral community structure was studied in four continental reefs in the Colombian Caribbean, two in the Santa Marta region: Punta Betín (PB) and Morro Grande Island (MO), and two in the Tayrona National Natural Park (PNNT): Granate cove (GR) and Gayraca bay (GA). Coral composition and cover were quantified in 2002 and compared to base line studies from 1989 (PB, MO &amp; GR) and from 1992 (GA). These variables were quantified by 20 m linear transects between 1.5 m and 29 m depth. After a decade, all reefs lost in average...
Tipo: Journal Contribution
Palavras-chave: Coral reefs; Degradation; Temporal variations; Community composition; Coral reefs; Degradation; Http://aims.fao.org/aos/agrovoc/c_1880; Http://aims.fao.org/aos/agrovoc/c_2159.
Ano: 2005
URL: http://hdl.handle.net/1834/2012

Degradation of the riparian wetlands in the Lake Victoria basin - Yala swamp case study
Provedor de dados: 20
Autores: Thenya, Thuita; Wassmann, Reiner; Verchot, Louis; Mungai, David.
Land degradation is as a result of broad range of scales and factors, which include biophysical, climatic, demographic and socio-economic. The aim of this paper was to provide an analysis of wetland utilisation, ecosystem degradation and their effect on the Lake Victoria (Kenya) ecosystem. This involved analysis of socioeconomic and remote sensed data. The main sources of wetland degradation in the Lake Victoria basin were identified as (1) farming activities, (2) grazing and macrophyte harvesting and (3) coupled with catchment degradation-deforestation. These factors were closely related to the demographic dynamics and unsustainable land utilisation practices. Socio-economic data provided valuable insight on the pattern of wetland utilisation and possible...
Tipo: Proceedings Paper
Palavras-chave: Riparian environments; Degradation; Wetlands; Inland waters; Catchment area; Remote sensing; Environmental effects; Socioeconomic aspects; Resource development; Sediment transport; Silting; Water pollution; Wetlands; Deforestation; Natural resources; Utilization; Land use; Pollutants.
Ano: 2006
URL: http://hdl.handle.net/1834/5313

Estudio de los procesos relacionados con la presencia de plaguicidas organoclorados en la Ciénaga Grande de Santa Marta
Provedor de dados: 20
Autores: Betancourt, J.M.; Ramírez-Triana, G.
The aim of this paper is to have an approach to the phenomena that take place in the lagoon complex of the Ciénaga Grande de Santa Marta (CGSM), which are related to the behavior of the remaining organochloride pesticides. Besides discussing the depuration processes, precipitation/sedimentation and the damping that are present in this coastal lagoon; with an environmental managing scope. The results analyzed were those obtained from the project called “Monitoring of the environmental conditions and the structural and functional changes of the vegetal communities and fishing resources during the rehabilitation of the CGSM”. The main removal type in the CGSM water system for organochloride compounds in the water column, occurs by  recipitation/sedimentation...
Tipo: Journal Contribution
Palavras-chave: Coastal lagoons; Sedimentation; Degradation; Pesticides; Degradation; Pesticides; Coastal lagoons; Sedimentation; Http://aims.fao.org/aos/agrovoc/c_2159; Http://aims.fao.org/aos/agrovoc/c_5739; Http://aims.fao.org/aos/agrovoc/c_1697; Http://aims.fao.org/aos/agrovoc/c_6926.
Ano: 2005
URL: http://hdl.handle.net/1834/2018

Water quality trends and input loads to Lake Nakuru
Provedor de dados: 20
Autores: Kulecho, Andrew; Muhandiki, Victor.
Water quality trends of Lake Nakuru, Kenya and its feeder streams were monitored in 2001-2004. Water samples were obtained from eleven stations in the lake and five points on inflowing streams. The items monitored were physico-chemical and biological components. The drainage basin was characterized by recurrence of dry spells throughout the period with water losses in the lake exceeding the amount received to cause a fall in water volume. The lake water salts content rose – conductivity and alkalinity reached 58 ms/cm and 5,200 mg/l respectively. PH was more or less constant (10.00 – 10.36). Daytime oxygen concentration in the mid-lake system rose (to greater than 20 mg/l) while remaining low in the inflow portions of the lake. On one occasion, the lake...
Tipo: Proceedings Paper
Palavras-chave: Water quality; Biomass; Mortality causes; Anthropogenic factors; Phytoplankton; Pollution effects; Degradation; Man-induced effects; Inland waters; Freshwater pollution; Physicochemical properties; Inflow; Environmental monitoring; Land use; Urbanization; Environmental impact; Pollution; Freshwater.
Ano: 2006
URL: http://hdl.handle.net/1834/5312

Carbon flows through meiobenthic nematodes in the Westerschelde Estuary
Provedor de dados: 27
Autores: Li, J.; Vincx, M.; Herman, P.M.J.
A time dynamic model was used to estimate carbon flows through nematodes in an intertidal benthic ecosystem in the Westerschelde Estuary, The Netherlands. The model calibrated the nematode biomass observed from March 1991 to February 1992. The forcing functions of the model included meiobenthos biomass, macrobenthos biomass, bacterial density, chlorophyll-a concentration, and other abiotic data such as temperature and day length. We estimate that the nematode population had a low level of standing stock 249 mg C m(-2), but a high level of carbon flow. It consumed 98 mg C m(-2) d(-1) and produced 22 mg C m(-2) d(-1). Defecation was 73 mg C m(-2) d(-1). Losses in respiration, excretion and natural death were only 3 mg C m(-2) d(-1). The annual P/B was 32 for...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Degradation; Ecology; Marine nematodes; Meiobenthos; Respiration.
Ano: 1997
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=7296

Het Schelde-estuarium als filter: een bioreactor van stofstromen
Provedor de dados: 27
Autores: Van Damme, S.; Meire, P.
The Scheldt estuary is exposed to large loads of carbon and nutrients. This leads to a eutrophication problem characterized by reduced oxygen concentrations and a huge efflux of CO&lt;sub&gt;2&lt;/sub&gt;. In the coastal waters a degradation of the foodchain is noted caused by excessive nutrient supply. The capacity of the estuary to polish the water is important but can not cope with the vast scale of the immissions. Restoration and development of tidal wetlands can contribute in several ways to restore the water quality. Increase of water treatment is expected to have positive ecological results. Nevertheless, restoration of the oxygen conditions might counteract some purifying processes.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Degradation; Estuaries; Eutrophication; Food chains; Nutrients (mineral); Water quality.
Ano: 2001
URL: http://www.vliz.be/imisdocs/publications/280697.pdf

Survival of pathogens on soybean debris under no-tillage and conventional tillage systems
Provedor de dados: 86
Autores: Almeida,Álvaro Manuel Rodrigues; Saraiva,Odilon Ferreira; Farias,José Renato Bouças; Gaudêncio,Celso Almeida; Torres,Eleno.
A study was conducted in the subtropical area of Southern Brazil to determine the survival of pathogens in soybean residues under conventional and no-tillage cultivation systems from March to September of 1998 and 1999. The pathogens most frequently isolated were Colletotrichum truncatum, Phomopsis spp., Cercospora kikuchii, Fusarium spp., Macrophomina phaseolina, and Rhizoctonia solani. Other fungi isolated were Myrothecium roridum, Penicillium sp., Chaetomium sp., Epicoccum sp., Corynespora cassiicola and Trichoderma sp. The percent of survival of each pathogen varied according to the month and the year. Survival of C. truncatum, Phomopsis spp. and C. kikuchii were significantly reduced (p&lt;0.05) from the first to the last evaluation either on buried...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cultivation; Crop residues; Degradation; Biomass; Plant diseases.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2001001000003

Fungi degrading metsulfuron methyl in agricultural soils of Argentina
Provedor de dados: 85
Autores: Vázquez,MB; Bianchinotti,MV.
Strains of Mucor, Penicillium and Trichoderma, able to use metsulfuron-methyl (MM) as a sole carbon and energy source, were isolated from agricultural soils in Argentina. This is the first time this ability is recorded in the Mucor or Trichoderma species. When the isolated strains were compared in relation to their capacity to use the herbicide, those of Trichoderma showed the best results. Because of this, they were selected for further assays. The effect of metsulfuron on growth in liquid media was tested. Also, the ability of conidia to germinate in water agar medium containing the target herbicide was evaluated. All the strains could grow from spores using only metsulfuron-methyl as a carbon and energy source. These strains of Trichoderma are promising...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Degradation; Herbicides; Soils; Sulfonylurea; Trichoderma.
Ano: 2013
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572013000100016

Environmental fate of S-Metolachlor: a review
Provedor de dados: 87
Autores: Zemolin,C.R.; Avila,L.A.; Cassol,G.V.; Massey,J.H.; Camargo,E.R.
S-metolachlor is a preemergent herbicide used for the control of annual grasses and small-seeded broadleaf weeds in more than 70 agricultural crops worldwide. Recently, Smetolachlor has been used to control imidazolinone-resistant red rice in rice-soybean rotation in lowland environments of the Southern Brazil. However, limited information concerning the environmental fate of S-metolachlor in lowland soil is available in the literature. Thus, this review was designed to describe the major transport and dissipation processes of Smetolachlor in attempting to improve weed management programs used in rice-soybean rotation and mitigate environmental contamination of lowland areas.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chloroacetamide; Degradation; Dissipation; Transport; Retention.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582014000300022

Carryover of Imazethapyr + Imazapic on Ryegrass and Non-tolerant Rice as Affected by Thickness of Soil Profile
Provedor de dados: 87
Autores: Bundt,A.D.C.; Avila,L.A.; Agostinetto,D.; Nohatto,M.A.; Vargas,H.C.
Herbicides used in Clearfield(r) rice system may persist in the environment, damaging non-tolerant crops sown in succession and/or rotation. These damages vary according to soil characteristics, climate and soil management. The thickness of the soil profile may affect carryover effect; deeper soils may allow these molecules to leach, reaching areas below the roots absorption zone. The aim of this study was to evaluate the effect of the thickness of soil profile in the carryover of imazethapyr + imazapic on ryegrass and non-tolerant rice, sown in succession and rotation to rice, respectively. Lysimeters of different thicknesses (15, 20, 30, 40, 50 and 65 cm) were constructed, where 1 L ha-1 of the imazethapyr + imazapic formulated mixture was applied in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Degradation; Imidazolinone; Lolium multiflorum; Leaching; Oryza sativa.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582015000200357

Traditional Representations of the Natural Environment and Biodiversity Conservation: Sacred Groves in Ghana
Provedor de dados: 31
Autores: Sarfo-Mensah,   Paul; Oduro,   William; Antoh Fredua,   Ernestina; Amisah,   Stephen.
Local cosmologies and traditional perceptions of the natural environment, especially forests, have been a major influence in the management of the natural resources and biodiversity amongst rural communities in the transitional zone of Ghana. Sacred groves, which are typical outputs of traditional conservation practices, derive from indigenous religious beliefs and perceptions of forest. Sacred groves are believed to be the abode of local gods, ancestral spirits and other super natural beings. These beliefs and perceptions have in the past strongly supported the conservation of biodiversity. However, changes in local cosmologies threaten the protection of rare species, habitats and ecological processes. Data from the study confirm evidence from several...
Tipo: Working or Discussion Paper
Palavras-chave: Sacred Grove; Cultural Artefact; Communal Resource; Degradation; Sustainability and Biodiversity; Institutional and Behavioral Economics; Q5.
Ano: 2010
URL: http://purl.umn.edu/92787

Hierarquizacao dos agropolos cearenses segundo o indice de degradacao ambiental
Provedor de dados: 31
Autores: Lima,   Joilson Silva; Cruz,   Carlos Eduardo Braga; Brito,   Ana Vladia Da Costa; Farias,   Renata Maria De Oliveira; Mayorga,   Maria Irles De Oliveira.
O presente estudo buscou hierarquizar os agropolos do Ceará segundo o seu índice de degradação ambiental. Foram utilizados dados secundários referentes aos municípios cearenses agrupados em agropolos. Foi identificado um conjunto de causas do fenômeno definido a partir de literatura especializada. Estas causas foram representadas por indicadores agrupados em três aspectos sendo 10 econômicos, 6 sociais e 6 ambientais. Foram construídos índices de degradação para cada aspecto. Os agropolos Inhamuns Norte, Cariri Oeste e Sertão de Canindé foram os mais susceptíveis à degradação quando analisados os três aspectos simultaneamente e devem ser priorizados pelas políticas ambientais. Alguns agropolos demandam medidas direcionadas no processo de mitigação da...
Tipo: Presentation
Palavras-chave: Degradação; Meio ambiente; Desenvolvimento sustentável; Degradation; Environment; Sustainable development; Environmental Economics and Policy.
Ano: 2008
URL: http://purl.umn.edu/119150

The restoration and protection of the swampy meadow within an agricultural landscape
Provedor de dados: 31
Autores: Mactaggart,   Barbara; Bauer,   Johannes; Goldney,   David; Rawson,   Andrew.
This paper addresses some implications our limited understanding of the swampy meadow landform has on agricultural production and sustainable water management. The ecological and hydrological consequences of current water management practices have lead to a revaluation of natural approaches as an alternative to instream engineering solutions. One such approach would be the restoration/rehabilitation of the swampy meadow. These landforms act as buffering agents for floods and droughts, allow for the re-hydration of the floodplains, and have further positive effects on enhancing biodiversity and improving agricultural productivity outcomes. In this paper we examine the many confusing terms used to label the swampy meadow and postulate that this confusion,...
Tipo: Article
Palavras-chave: Swampy meadow; Chain of ponds; Restoration; Legislation; Policy; Degradation; Farm Management.
Ano: 2006
URL: http://purl.umn.edu/122522

Glyphosate behavior in a Rhodic Oxisol under no-till and conventional agricultural systems
Provedor de dados: 90
Autores: Prata,Fábio; Lavorenti,Arquimedes; Regitano,Jussara Borges; Vereecken,Harry; Tornisielo,Valdemar Luiz; Pelissari,Adelino.
The behavior of glyphosate in a Rhodic Oxisol, collected from fields under no-till and conventional management systems in Ponta Grossa, Parana state (Brazil) was investigated. Both agricultural systems had been in production for 23 years. Glyphosate mineralization, soil-bound forms, sorption and desorption kinetics, sorption/desorption batch experiments, and soil glyphosate phythoavailability (to Panicum maximum) were determined. The mineralization experiment was set up in a completely randomized design with a 2 x 2 factorial scheme (two management systems and two 14C radiolabelled positions in the glyphosate), with five replicates. 14CO2 evolution was measured in 7-day intervals during 63 days. The glyphosate sorption kinetics was investigated in a batch...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Herbicide; Sorption; Degradation; Mineralization; Phytotoxicity; Panicum maximum.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832005000100007

Enhanced degradation of metalaxyl in Gley Humic and Dark Red Latosol
Provedor de dados: 90
Autores: Papini,S.; Andréa,M. M.
Enhanced degradation of the fungicide metalaxyl was investigated in two soils: a gley humic (GH) and a Dark Red Latosol (LE), collected at sites never exposed to the fungicide. The soil samples were treated with successive applications of metalaxyl as a commercial formulation and 14C-metalaxyl in laboratory. Metalaxyl biodegradation was analyzed during 63 days by means of radiometric techniques to verify biomineralization and degradation product formation from the applied 14C-metalaxyl. Although biomineralization (maximum of 14 and 8% in the GH and LE soils, respectively), and partial degradation (about 32 and 48%, respectively) were detected in both soils, enhanced degradation was verified only in the GH soil. Results proved that metalaxyl behaves...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Degradation; Fungicide; Biomineralization.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832000000200023

Simulation and validation of the ruminal digestion of carbohydrates in cattle from kinetic parameters obtained by in vitro gas production technique
Provedor de dados: 96
Autores: Silva Cabral,Luciano da; Campos Valadares Filho,Sebastião de; Detmann,Edenio; Zervoudakis,Joanis Tilemahos; Galati,Rosemary Lais; Paula Sousa,Daniel de; Souza,Alexandre Lima de.
This study aimed to validate the estimates of the ruminal degradation of total carbohydrates (TC), ruminal and total digestion of fibrous carbohydrates (FC) and microbial nitrogen flow in the abomasum evaluated by in vitro gas production technique (IVGP). Six ruminally and abomasally cannulated steers arranged in a double 3 × 3 latin square were used to measure described parameters with indigestible neutral detergent fiber (INDF) utilization as marker. Total and fibrous carbohydrates degraded in the rumen were estimated through digestion rates obtained for fibrous (FC) and non fibrous carbohydrates (NFC) using in vitro gas production technique, corrected for its respective ruminal and postruminal passage rates. The estimation of the total digestion of FC...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Degradation; Fiber; Flow; Microbial nitrogen; Passage rate.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982011000900020

Ruminal fermentation modification of protein and carbohydrate by means of roasted and estimation of microbial protein synthesis
Provedor de dados: 96
Autores: Andrade-Montemayor,Héctor; García Gasca,Teresa; Kawas,Jorge.
The animal meal prohibition as a protein source with low ruminal degradability in ruminant nutrition, creates the need to seek alternatives, as legume seeds, however, its protein, have a high degradability, which could generate losses of nitrogen in the rumen. Other problem in the legume seeds is the content of antinutritional factors such as protease inhibitors, tannins, phenolic compounds, lectins and some others, could affect the digestibility. One alternative to decrease the degradability of the protein and/or decrease the activity of some antinutritional factors is the use of different technological treatments such as roasting. Microbial protein synthesis is dependent on the availability of nitrogen or amino acids and of the degradable carbohydrate...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Carbohydrates; Degradation; Microbial protein synthesis; Protein; Roasted.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982009001300028

Nutritional value of hay from maize-crop stubble ammoniated with urea
Provedor de dados: 124
Autores: Moreira Filho,Miguel Arcanjo; Alves,Arnaud Azevêdo; Vale,George Emanuel Silva do; Moreira,Antonia Leidiana; Rogério,Marcos Cláudio Pinheiro.
The objective of this research was to evaluate the chemical composition and in situ degradability of hay stubble from a maize crop fertilized with 40; 120 or 200 kg N ha-1, ammoniated with urea. To evaluate in situ degradability, 4 g samples were incubated in nylon bags in the rumen of cattle for 6; 24 and 72 hours. The levels of acid detergent fiber (35.4% DM) and acid detergent insoluble nitrogen (18.5% of total N) decreased, resulting in 32.7% of DM and 9.6% of the total N, and crude protein (CP) increased from 5.2 to 9.7% of DM as a result of the ammoniation with urea. The degradation of dry matter (48.7%), CP (56.5%) and neutral detergent fiber (33.6%) increased with ammoniation, averaging 54.5 and 75.4, and 38.4% respectively, but was not influenced...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Degradation; Hay ammoniated; Maize-crop stubble as forage.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902013000400028

Carbon losses and soil property changes in ferralic Nitisols from Cuba under different coverages
Provedor de dados: 63
Autores: Hernández-Jiménez,Alberto; Vargas-Blandino,Dania; Bojórquez-Serrano,José Irán; García-Paredes,Juan Diego; Madueño-Molina,Alberto; Morales-Díaz,Marisol.
ABSTRACT The transformation of primary forestlands into lands under cultivation exerts an impact on the physical and chemical properties of the soils, leading to loss of carbon from the soil. The aims of this study were (1) to estimate the impact of different land use on organic carbon stock (OC-stock) and (2) to determine the clay percentage, the dispersion factor, and bulk density with regard to soil management. Thirty soil profiles were sampled as follows: four under primary forests with 80-100 years (old growth); two under secondary wood forests with 45-50 years; eight under secondary young forests with 15-25 years; four under pasture land with 15-20 years; and 12 under continuous cultivation for &gt; 50 years. We determined the changes in OC-stock in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Degradation; Carbon reserves; Physical properties; Tropical soils.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162017000400311

Passalid (Insecta: Coleoptera: Passalidae) collected from trunks of Scleronema micranthum (Malvaceae)
Provedor de dados: 36
Autores: ABREU,Raimunda Liege Souza de; RONCHI-TELES,Beatriz; VIANEZ,Bazilio Frasco; FONSECA,Claudio Ruy Vasconcelos da; GOUVEIA,Fernando Bernardo Pinto; SILVA,Ediene Borges da.
ABSTRACT Some beetles can attack the wood immediately after the tree is felled, but there are those that start their attack at different stages of wood degradation. Beetles of the family Passalidae belong to this latest category. The objective of this study was to assess the occurrence of beetles of this family in wood samples taken from trunks of Scleronema micranthum, a forest species from Central Amazon. The samples were exposed to biodegradation for 24 months on the forest ground of the Experimental Station of Tropical Silviculture of the National Institute for Amazonian Research, in Manaus, Amazon State, Brazil. During that period, 15 samples were removed from the experiment, every two months, for insect collection and evaluation of infestation. The...
Tipo: Info:eu-repo/semantics/report
Palavras-chave: Amazon wood; Beetle; Passalidae; Degradation.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672017000100071

The mineralogy and chemistry of the German and Portuguese tiles used to face a historic building in the Amazon region and their natural susceptibility to tropical weathering
Provedor de dados: 36
Autores: Costa,Marcondes L. da; Sanjad,Thais A.B.C.; Paiva,Rosildo S.
During the 19th century, the most prominent buildings of the city of Belém were faced entirely with tiles manufactured in Portugal and Germany, which now exhibit distinct degrees of degradation. The Pinho mansion is one of the most important of these buildings and was selected for the investigation of the action of the tropical Amazonian climate on the degradation of the tiles. To achieve this objective, the tiles were mapped for organic and inorganic degradation, and samples were collected for analysis. The minerals were determined by XRD, the chemical composition by classical wet methods and SEM/EDS, and the microorganisms under the microscope. The results show that the German and Portuguese tiles are quite different in their composition. While both...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: German and Portuguese tiles; Degradation; Tropical weathering; Amazon region.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672013000300008

Net mineralization nitrogen and soil chemical changes with application of organic wastes with ‘Fermented Bokashi Compost’ - doi: 10.4025/actasciagron.v35i2.15133
Provedor de dados: 1
Autores: Boechat, Cácio Luiz; Universidade Federal do Rio Grande do Sul; Santos, Jorge Antonio Gonzaga; Universidade Federal do Recôncavo da Bahia; Accioly, Adriana Maria de Aguiar; Empresa Brasileira de Pesquisa Agropecuária.
The use of organic wastes in agricultural soils is one of the possible ways to employ these materials. The aims of this study were to evaluate the effectiveness of organic wastes and Fermented Bokashi Compost (FBC), to establish the most efficient use of organic wastes for a soil, changing the net nitrogen mineralization and soil chemical properties. The experimental design was completely randomized in a 6 x 2 x 5 factorial, being five organic wastes plus an control (soil without waste), with or without FBC, evaluated at 0, 7, 42, 70 and 91 days of incubation, with three replicates, under laboratory conditions. The organic wastes enhanced the soil chemical properties and increased nitrogen concentration in soil. However, the net nitrogen mineralization was...
Tipo: Experimento sob condições controladas de laboratório
Palavras-chave: 5.01.01.05-6 efficacy of microorganisms; Sewage sludge; Degradation; Fertility Fertilidade do Solo e Adubação.
Ano: 2013
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/15133

Chemical-bromatological composition and in vitro ruminal kinetics of sugar cane silage with maniçoba
Provedor de dados: 2
Autores: Carvalho, Francisco Allan Leandro de; Resende, Percivaldo Xavier; Benicio, Clístenes Amorim; Siqueira, Jackson de Oliveira; Menezes, Daniel Ribeiro; Queiroz, Mário Adriano Ávila.
The objective this study was to evaluate the effect of maniçoba supplementation in sugar cane silage with respect to chemical-bromatological composition and the in vitro degradation kinetics of the silage. This experiment was conducted in a completely randomized design with four treatments (maniçoba levels: 0, 20, 30, and 40%) and six repetitions. Silage samples were analyzed for their chemical-bromatological composition, digestible energy, metabolizable energy, total digestible nutrients, in vitro gas production and degradability parameters. The silage with higher inclusion level had better bromatological composition (p &lt; 0.05) than the silage without maniçoba for CP, NDF, ADF and MM (6.49, 56.64, 38.66 and 4.52% versus 2.21, 70.96, 49.95 and 2.78%)....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Degradation; Forage conservation; Gas production; Saccharum officinarum.
Ano: 2018
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/42569

Desempenho da tilápia-do-Nilo arraçoada com dietas contendo farinha de sangue bovino atomizado ou convencional - doi: 10.4025/actascianimsci.v33i3.10736
Provedor de dados: 2
Autores: Narváez-Solarte, Willian Vicente; Universidad de Caldas; Pezzato, Antonio Celso; Faculdade de Medicina Veterinária e Zootecnia, UNESP - Botucatu; Pezzato, Luiz Edivaldo; Faculdade de Medicina Veterinária e Zootecnia, UNESP - Botucatu; Barros, Margarida Maria; Faculdade de Medicina Veterinária e Zootecnia, UNESP - Botucatu; Polycarpo, Gustavo do Valle; Faculdade de Medicina Veterinária e Zootecnia, UNESP - Botucatu.
Foi avaliado o desempenho e os índices de rendimento da tilápia-do-Nilo (Oreochromis niloticus) alimentada com níveis crescentes de farinha de sangue atomizado (FSA) ou de farinha de sangue convencional (FSC) em dietas formuladas com base em aminoácidos digestíveis. Foram utilizados 252 alevinos, distribuídos num delineamento inteiramente casualizado, em esquema fatorial (2 x 4) + 1, duas classes de farinha de sangue com quatro níveis de inclusão de cada farinha na dieta, e uma dieta-controle, com quatro repetições. Os tratamentos consistiram em uma dieta-controle à base de farelo de soja, contendo 34% de proteína digestível (PD) e 3.200 kcal de energia digestível kg-1 (ED), mais quatro rações formuladas com FSA e quatro rações com FSC, com inclusões de 5,...
Tipo: Pesquisa acadêmica
Palavras-chave: Ciências Agrárias; Zootecnia; Aqüicultura; Nutrição e Alimentação Animal Aminoácidos; Desnaturação; Proteína; Oreochromis niloticus amino acids; Degradation; Protein; Oreochromis niloticus.
Ano: 2011
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/10736

Assessing the nutritional value of agroindustrial co-products and feed through chemical composition, in vitro digestibility, and gas production technique
Provedor de dados: 2
Autores: Olivo, Paula Martins; Santos, Geraldo Tadeu dos; Ítavo, Luís Carlos Vinhas; Silva Junior, Ranulfo Combuca da; Leal, Eduardo Souza; Prado, Rodolpho Martin do.
Agroindustrial co-products are a viable alternative for use in animal nutrition. Tests were conducted using eight different types of co-products and feed to evaluate the chemical composition, in vitro digestibility of dry matter, crude protein and neutral detergent fiber, and gas production by them. The co-products tested were: coffee hulls; pelleted citrus pulp; grape residue; soybean hulls; cottonseed; cassava foliage; and foods usually supplied to ruminants: corn silage and ground corn concentrate. Data of in vitro digestibility of dry matter, crude protein and neutral detergent fiber were tested by analysis of variance using the least square method; the results of gas production were interpreted by a non-linear regression by the Gauss-Newton method;...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Zootecnia; Nutrição de Ruminantes alternative feed; Degradation; Fermentation; Gas production.s.
Ano: 2017
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/34024

Sensitivity of understorey bird species in two different successional stages of the lowland Atlantic Forest, Brazil
Provedor de dados: 42
Autores: Loures-Ribeiro,Alan; Manhães,Marco A.; Dias,Manoel M.
The Atlantic Forest has a high destruction rate and there is little information available on some aspects of the neotropical bird biology. Changes in environment are important factors that affect the resources available to birds. We compared the species sensitivity level of understorey birds in two areas in distinct successional stages (primary and secondary sections). Two 100 ha plots of lowland Atlantic Forest were analysed between August and December 2006. Among 25 bird species recorded, thirteen had lower abundance in secondary forest, two in primary forest, and ten had not clear tendency. According to the criteria used, the percentages for species with low, and medium and high sensitivity to habitat change were 44% and 56%, respectively. The number of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Degradation; Neotropical birds; Point counts; South America; Tropical forest.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000300016

Influence of environmental quality of the tributaries of the Monjolinho River on the relative condition factor (Kn) of the local ichthyofauna
Provedor de dados: 49
Autores: Barrilli,Germano Henrique Costa; Rocha,Odete; Negreiros,Natalia Felix; Verani,José Roberto.
The relative condition factors (Kn) of the fishes Astyanax paranae, Phalloceros harpagos and Poecilia reticulata were used as a means of assessing the influence of environmental conditions on the well-being of sub - populations of these species, with the eventual aim of using them as bioindicators of disturbance in tributary streams of the Monjolinho River, in São Carlos - SP. The power-law curve generated by the length-weight relationship indicated a positive allometric growth for the three species studied. Overall, the canonical correspondence analysis (CCA) positively correlated average Kn of A. paranae with well oxygenated and oligotrophic environments, typical of conserved areas or near the natural state. For the average value of Kn obtained for...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biomonitoring; Condition factor; Length-weight relationship; Degradation; Bioindicators.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032015000100104

Penicillium expansum versus antagonist yeasts and patulin degradation in vitro
Provedor de dados: 52
Autores: Coelho,Alexandre Rodrigo; Celli,Marcos Giovani; Ono,Elisabete Yurie Sataque; Wosiacki,Gilvan; Hoffmann,Fernando Leite; Pagnocca,Fernando Carlos; Hirooka,Elisa Yoko.
Taking into account the preliminary antagonistic/biodegradation property showed by Pichia membranifaciens and Sporobolomyces roseus, which decreased the initial patulin concentration of 588.4 to 290.0 µg/mL, ability of P. ohmeri 158 in biocontrol against Penicillium expansum and patulin decrease in vitro was performed. The culture supernatant of P. ohmeri 158 was effective against 66.17% micelial growth, indicating antibiosis related with the killer phenomenon. The initial patulin concentration of 223 µg in the presence of P. ohmeri 158 cells was decreased over 83% of the original concentration, when incubated at 25ºC/2 days and &gt; 99% after 5 days incubation time, with undetectable patulin level after 15 days. The initial pH 4.0 decreased to pH 3.3...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Penicillium expansum; Antagonist yeasts; Biocontrol; Patulin; Degradation.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132007000400019

Dimethoate degradation in plants and during processing of yerba maté leaves
Provedor de dados: 52
Autores: Schmalko,Miguel E.; Ramallo,Laura A.; Ferreira,Darío; Berlingheri,Rubén D.
The objective of this research was to study degradation kinetics of dimethoate in plants of Ilex paraguariensis Saint Hilaire (or yerba maté) and during its processing. To determine dimethoate concentration, a capillary gas chromatography technique with a mass selective detector was used. Half-life times in plants ranked between 9.8 and 11.8 days. During processing, with a blanching and two drying steps, dimethoate concentration decayed to a 22.7% of its initial value (in dry basis); while during seasoning step (at 45°C), half-life time was 17.3 days. With these values, preharvest safety interval was determined.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Dimethoate; Pesticide; Degradation; Processing; Ilex paraguariensis; Yerba maté.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132002000600003

Analysis of the Insertion of Particular Photovoltaic Generation in the Low Voltage Installations, Under the Approach to Performance, Safety, Maintenance and Operation of the PVS
Provedor de dados: 52
Autores: Moraes,Fillipe Alexandre; Takeda,Othavio Toniasso.
ABSTRACT The growing use of Photovoltaic Solar Energy in Brazil, both in power plants and in distributed generation systems, brings with it a series of practical and technical questions that are not limited to the design and project of the systems. Environmental factors and resources related to the use, operation, maintenance, decommissioning and final disposal of the equipment and components that constitute them, should be taken into consideration, so that these systems maintain an adequate performance during their lifespan granting the safety for users, properties and avoid negative environmental impacts. Within the concept of Risk Analysis within the Life Cycle of these systems, the present study addresses a perspective of the growth of the use of Solar...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Photovoltaic Installations; Maintenance; Degradation; Reliability.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132018000200234

Reviewing Microbial Behaviors in Ecosystems Leading to a Natural Quorum Quenching Occurrence
Provedor de dados: 52
Autores: Zapata,Laura Sierra; Tabarez,Magally Romero; Álvarez,Javier Correa; Escobar,Valeska Villegas.
ABSTRACT Quorum sensing is considered one of the most important discoveries in cell-to-cell communication. Although revealed in Bacteria, it has been identified as well as a mechanism present in the other two domains, Eukaryota and Archaea. This phenomenon consists mainly of an exchange and sensing of "words" produced by each cell: chemical signals known as autoinducers. The process takes places at high cell densities and confined environments, triggering the expression of specific genes that manifest in a determined phenotype. Quorum sensing has a fundamental importance in the organisms' fitness in natural ecosystems since it activates many of the traits needed by cells to survive under specific conditions, and thus a wide variety of chemical signals,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Quorum Sensing; Autoinducers; Interference; Degradation; Microbial Ecology; Quorum Quenching.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132017000100409

Degradation and detoxification of three textile Azo dyes by mixed fungal cultures from semi-arid region of Brazilian Northeast
Provedor de dados: 52
Autores: Nascimento,Carlos; Magalhães,Danielly de Paiva; Brandão,Martha; Santos,André Batouli; Chame,Marcia; Baptista,Darcílio; Nishikawa,Marília; Silva,Manuela da.
The aim of this work was to study the degradation and detoxification of three textile azo dyes (Reactive Red 198, Reactive Red 141 and Reactive Blue 214) by mixed fungal cultures from semi-arid region of Brazilian Northeast. Sediment samples of twenty water reservoirs in the surroundings of Serra da Capivara National Park, area of environmental preservation in the caatinga in the State of Piauí, with semi-arid climate, were evaluated in order to select the consortia of fungi capable to degrade and detoxify these dyes. The mixed fungal culture from Caldeirão Escuridão (CE) reservoir was the most efficient in the degradation and detoxification of the dyes tested.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fungi; Mycoremediation; Azo dyes; Degradation; Detoxification.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132011000300024

[RETRACTED ARTICLE] Ginsenoside Rd inhibits IL-1β-induced inflammation and degradation of intervertebral disc chondrocytes by increasing IL1RAP ubiquitination
Provedor de dados: 56
Autores: Zhang,Wei-Jia; Liu,Ying; Wei,Jie-Shu; Wu,Ya-Li.
Many compounds of ginsenosides show anti-inflammatory properties. However, their anti-inflammatory effects in intervertebral chondrocytes in the presence of inflammatory factors have never been shown. Increased levels of pro-inflammatory cytokines are generally associated with the degradation and death of chondrocytes; therefore, finding an effective and nontoxic substance that attenuates the inflammation is worthwhile. In this study, chondrocytes were isolated from the nucleus pulposus tissues, and the cells were treated with ginsenoside compounds and IL-1β, alone and in combination. Cell viability and death rate were assessed by CCK-8 and flow cytometry methods, respectively. PCR, western blot, and immunoprecipitation assays were performed to determine...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ginsenoside Rd; IL-1β; Inflammation; Degradation; Intervertebral disc chondrocytes; IL1RAP ubiquitination.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2019000900602

In vitro degradation of linamarin by microorganisms isolated from cassava wastewater treatment lagoons
Provedor de dados: 58
Autores: Vasconcellos,S. P; Cereda,M. P.; Cagnon,J. R.; Foglio,M.A.; Rodrigues,R.A.; Manfio,G. P.; Oliveira,V. M.
This study aimed at isolating and characterizing of microorganisms able to use linamarin as sole carbon source. Thirty one microbial strains were isolated from manipueira, a liquid effluent of cassava processing factories. Among these strains, Bacillus licheniformis (isolate 2_2) and Rhodotorulla glutinis (isolate L1) were able to degrade 71% and 95% of added linamarin, respectively, within 7 days, showing high biodegradation activity and great potential for detoxification of cassava processing wastewaters.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bacillus; Degradation; Manipueira; Fertirrigation.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822009000400019

Biodegradation of cypermethrin by immobilized cells of Micrococcus sp. strain CPN 1
Provedor de dados: 58
Autores: Tallur,Preeti N.; Mulla,Sikandar I.; Megadi,Veena B.; Talwar,Manjunatha P.; Ninnekar,Harichandra Z.
Pyrethroid pesticide cypermethrin is a environmental pollutant because of its widespread use, toxicity and persistence. Biodegradation of such chemicals by microorganisms may provide an cost-effective method for their detoxification. We have investigated the degradation of cypermethrin by immobilized cells of Micrococcus sp. strain CPN 1 in various matrices such as, polyurethane foam (PUF), polyacrylamide, sodium alginate and agar. The optimum temperature and pH for the degradation of cypermethrin by immobilized cells of Micrococcus sp. were found to be 30 °C and 7.0, respectively. The rate of degradation of 10 and 20 mM of cypermethrin by freely suspended cells were compared with that of immobilized cells in batches and semi-continuous with shaken...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Degradation; Immobilization; Cypermethrin; Polyurethane foam; Micrococcus sp. strain CPN 1.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822015000300667

Rubber gloves biodegradation by a consortium, mixed culture and pure culture isolated from soil samples
Provedor de dados: 58
Autores: Nawong,Chairat; Umsakul,Kamontam; Sermwittayawong,Natthawan.
Abstract An increasing production of natural rubber (NR) products has led to major challenges in waste management. In this study, the degradation of rubber latex gloves in a mineral salt medium (MSM) using a bacterial consortium, a mixed culture of the selected bacteria and a pure culture were studied. The highest 18% weight loss of the rubber gloves were detected after incubated with the mixed culture. The increased viable cell counts over incubation time indicated that cells used rubber gloves as sole carbon source leading to the degradation of the polymer. The growth behavior of NR-degrading bacteria on the latex gloves surface was investigated using the scanning electron microscope (SEM). The occurrence of the aldehyde groups in the degradation...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Degradation; Natural rubber; Rubber glove; Rhodococcus.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822018000300481

Sphingomonas from petroleum-contaminated soils in Shenfu, China and their PAHs degradation abilities
Provedor de dados: 58
Autores: Zhou,Lisha; Li,Hui; Zhang,Ying; Han,Siqin; Xu,Hui.
Abstract Members of the Sphingomonas genus are often isolated from petroleum-contaminated soils due to their unique abilities to degrade polycyclic aromatic hydrocarbons (PAHs), which are important for in situ bioremediation. In this study, a combined phenotypic and genotypic approach using streptomycin-containing medium and Sphingomonas -specific PCR was developed to isolate and identify culturable Sphingomonas strains present in petroleum-contaminated soils in the Shenfu wastewater irrigation zone. Of the 15 soil samples examined, 12 soils yielded yellow streptomycin-resistant colonies. The largest number of yellow colony-forming units (CFUs) could reach 105 CFUs g-1 soil. The number of yellow CFUs had a significant positive correlation (p &lt; 0.05)...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Sphingomonas; Polycyclic aromatic hydrocarbons (PAHs); Degradation; Genus.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822016000200271

Activity of glycosidases from freshwater heterotrophic microorganisms on the degradation of extracellular polysaccharide produced by Anabaena spiroides (Cyanobacteria)
Provedor de dados: 58
Autores: Colombo,Vanessa; Vieira,Armando A.H.; Moraes,Gilberto.
The activity of specific glycosidases during the degradation of the extracellular polysaccharide (EPS) produced by Anabaena spiroides was determined using MUF-substrates (MUF-monosaccharides). Polysaccharide degradation was found to occur in a two-phase process. The first consisted of high enzymatic activity that consumed 41% of the EPS at a relatively high rate, while the second consumed the remaining polysaccharide (59%) at a slower rate. A transition phase from the higher to the slower degradation rates was marked by a replacement of bacterial populations from coccoid to bacillus cells. During the degradation process, the bacterial biomass increased with the decrease of EPS, as revealed by bacterial cell counts. The enzymatic activity detected through...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Anabaena spiroides; Glycosidases; Extracellular polysaccharides; Degradation; Heterotrophic microorganisms.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822004000100018

Microbial degradation of sulfentrazone in a Brazilian rhodic hapludox soil
Provedor de dados: 58
Autores: Martinez,Camila O.; Silva,Celia Maria M. S.; Fay,Elisabeth F.; Abakerli,Rosangela B.; Maia,Aline H. N.; Durrant,Lucia R.
Sulfentrazone is amongst the most widely used herbicides for treating the main crops in the State of São Paulo, Brazil, but few studies are available on the biotransformation of this compound in Brazilian soils. Soil samples of Rhodic Hapludox soil were supplemented with sulfentrazone (0.7 µg active ingredient (a.i.) g-1 soil) and maintained at 27ºC. The soil moisture content was corrected to 30, 70 or 100 % water holding capacity (WHC) and maintained constant until the end of the experimental period. Herbicide-free soil samples were used as controls. Another experiment was carried out using soil samples maintained at a constant moisture content of 70% WHC, supplemented or otherwise with the herbicide, and submitted to different temperatures of 15, 30 and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Herbicide; Degradation; Microorganisms; Half-life.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822010000100030

Degradation of textile dyes by cyanobacteria
Provedor de dados: 58
Autores: Dellamatrice,Priscila Maria; Silva-Stenico,Maria Estela; Moraes,Luiz Alberto Beraldo de; Fiore,Marli Fátima; Monteiro,Regina Teresa Rosim.
Abstract Dyes are recalcitrant compounds that resist conventional biological treatments. The degradation of three textile dyes (Indigo, RBBR and Sulphur Black), and the dye-containing liquid effluent and solid waste from the Municipal Treatment Station, Americana, São Paulo, Brazil, by the cyanobacteria Anabaena flos-aquae UTCC64, Phormidium autumnale UTEX1580 and Synechococcus sp. PCC7942 was evaluated. The dye degradation efficiency of the cyanobacteria was compared with anaerobic and anaerobic-aerobic systems in terms of discolouration and toxicity evaluations. The discoloration was evaluated by absorption spectroscopy. Toxicity was measured using the organisms Hydra attenuata, the alga Selenastrum capricornutum and lettuce seeds. The three...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Dyes; Toxicity; Discoloration; Cyanobacteria; Degradation.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822017000100025

Development and validation of a new and economical stability indicating RP-HPLC method for cefixime trihydrate
Provedor de dados: 60
Autores: Mathew,Ceema; Swathi,Bellamkonda; Ajitha,Makula; Babu,Puvvadi Sathesh.
ABSTRACT The present work describes the development of a new high performance liquid chromatographic (HPLC) method for the determination of Cefixime trihydrate under different stress conditons as specified by ICH. For the analysis, a Phenomenex (250 x 4.6 mm, 5 µm particle size) ODS column and a SPD 20 A UV detector at 289 nm was used. The selected mobile phase was 10 mM disodium hydrogen phosphate (with 0.5% TEA, pH adjusted to 6.3 with OPA) and methanol in the ratio of 75:25 (v/v) in isocratic mode at a flow rate of 1 mL.min-1.The linear regression analysis data for the calibration plots showed good linear relationship with r2 = 0.9997 in the concentration range of 5-100 μg.mL-1. The stress degradation was performed using acid, alkali, water, hydrogen...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: High Performance Liquid Chromatography/quantitative analysis; Degradation; Stability-indicating; Cefixime trihydrate/determination.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-82502016000100010

Screening of white rot fungal species for their capacity to degrade lindane and other isomers of hexachlorocyclohexane (HCH)
Provedor de dados: 118
Autores: Quintero,Juan C; Moreira,María T; Feijoo,Gumersindo; Lema,Juan M.
White-rot fungi have demonstrated a high capacity to degrade organic pollutants, including the insecticide lindane (y-HCH). The purpose of this study was to evalúate the degradative capacities of several white rot fungi species, Bjerkandera adusta, Irpex lacteus, Lentinus tigrinus, Phanerochaete chrysosporium, Phanerochaete sórdida, Phlebia radiata, Pleurotus eryngii, Poliporus cialatus, and Stereum hirsutum. Fungal tolerance to various concentrations of a-, (3-, y- and 8 isomers of hexachlorocyclohexane (HCH) was studied in both liquid and soil media samples. 8- and y-HCH isomers showed the highest inhibition of fungal growth of all HCH isomers. P. chrysosporium and B. adusta exhibited a high tolerance to HCH pollution. The 8- and y-HCH isomers were...
Tipo: Journal article
Palavras-chave: Hexachlorocyclohexane; Degradation; Pesticides; Bjerkandera adusta; White rot fungi.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202008000200005

In vitro fermentation of corn silage using rumen fluid buffered or not and different sample amounts
Provedor de dados: 65
Autores: Homem Junior,Antonio Carlos; Ezequiel,Jane Maria Bertocco; Perez,Henrique Leal; Almeida,Marco Tulio Costa; Paschoaloto,Josimari Regina; Carvalho,Vanessa Barbosa de; Cremasco,Leonardo Fernandes; Costa,Macella Borsonello da.
Methodological variations in the amount of sample incubated and the type of rumen fluid used are commonly observed. This study evaluated the effect of three sample amounts (0.6, 1.3 or 2.6g DM 100mL-1 of rumen fluid) incubated in rumen fluid buffered (BRF-buffered rumen fluid) or not (PRF-pure rumen fluid) on total gas volume (TV), methane (CH4) production, dry matter degradation (DM Deg) and final pH of corn silage incubated in vitro. The highest DM Deg was reached with the lowest amounts of sample (0.6 and 1.3g of DM 100mL-1 of rumen fluid). The sample amount of 2.6g associated with PRF reduced CH4 production (P&lt;0.05), compared with the amounts of 0.6 and 1.3g DM 100mL-1, which had similar CH4 production (P&gt;0.05). The use of BRF caused no effect on...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Degradation; Gas; Incubation; Methane; PH.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782015001202229

Rice husk derived waste materials as partial cement replacement in lightweight concrete
Provedor de dados: 64
Autores: Kawabata,Celso Yoji; Savastano Junior,Holmer; Sousa-Coutinho,Joana.
In this study rice husk ash (RHA) and broiler bed ash from rice husk (BBA), two agricultural waste materials, have been assessed for use as partial cement replacement materials for application in lightweight concrete. Physical and chemical characteristics of RHA and BBA were first analyzed. Three similar types of lightweight concrete were produced, a control type in which the binder was just CEMI cement (CTL) and two other types with 10% cement replacement with, respectively, RHA and BBA. All types of similar lightweight concrete were prepared to present the same workability by adjusting the amount of superplasticizer. Properties of concrete investigated were compressive and flexural strength at different ages, absorption by capillarity, resistivity and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Agricultural waste; Rice husk ash; Broiler bed ash; Degradation.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542012000500010