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Registros recuperados: 32
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45-and 70-base DNA supramolecular polymerizations on quartz crystal microbalance biosensor ArchiMer
Lazerges, Mathieu; Perrot, Hubert; Rabehagasoa, Niriniony; Antoine, Elisabeth; Compere, Chantal.
Supramolecular polymerizations of 45- and 70- base DNAs on the surface of an in-situ time-resolved 27 MHz quartz crystal microbalance biosensor.
Tipo: Text Palavras-chave: Sensor; Design; Kinetics; Immobilization; Hybridization.
Ano: 2005 URL: http://archimer.ifremer.fr/doc/2005/publication-1710.pdf
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Adsorption of p-cresol on Granular Activated Carbon CIGR Journal
Lalitendu Das; North Carolina State University Biological and Agricultural Engineering; Praveen Kolar; North Carolina State University; Jason Osborne; North Carolina State University Department of Statistics; John Classen; North Carolina State University Biological and Agricultural Engineering.
Swine farming emit several odorous volatile organic compounds, one of which is p-cresol. Considering the layout of a swine barn, adsorption is one of the most suitable technologies for mitigating organic pollutants. In this study, commercial granular activated carbon (GAC) was tested as an adsorbent for removing p-cresol from aqueous solution. The objectives were to: 1) determine the combined effect of temperature, pH, and adsorbent dose on adsorption, (2) investigate the effect of volatile fatty acids and aldehydes on adsorption of p-cresol, (3) determine adsorption kinetics and isotherms, (4) study the effect of solvent on adsorption, (5) propose a possible mechanism of adsorption, and (6) discuss practical implications and design calculations for...
Palavras-chave: Agricultural Engineering Adsorption; P-cresol; Activated carbon; Kinetics; Isotherms; RSM.
Ano: 2012 URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/2171
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Biosorption kinetics of a direct azo dye Sirius Blue K-CFN by Trametes versicolor Electron. J. Biotechnol.
Erden,Emre; Kaymaz,Yasin; Pazarlioglu,Nurdan Kasikara.
In this study, lyophilized Trametes versicolor biomass is used as a sorbent for biosorption of a textile dye, Sirius Blue K-CFN, from an aqueous solution. The batch sorption was studied with respect to dye concentration, adsorbent dose and equilibrium time. The effect of pH and temperature on dye uptake was also investigated and kinetic parameters were determined. Optimal initial pH (3.0), equilibrium time (2 hrs), initial dye concentration ( 100 mg l-1) and biomass concentration (1.2 mg l-1) were determined at 26�C. The maximum biosorption capacity (q max) of Sirius Blue K-CFN dye on lyophilized T. versicolor biomass is 62.62 mg/g. The kinetic and isotherm studies indicated that the biosorption process obeys to a pseudo-second order model and Langmuir...
Tipo: Journal article Palavras-chave: Biosorbent; Biosorption; Direct dye; Kinetics; Sirius Blue K-CFN; Trametes versicolor.
Ano: 2011 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582011000200003
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Biosorption of lead(II) and chromium(VI) on groundnut hull: Equilibrium, kinetics and thermodynamics study Electron. J. Biotechnol.
Qaiser,Suleman; Saleemi,Anwar R; Umar,Muhammad.
The biosorption of lead(II) and chromium(VI) on groundnut hull was investigated. Batch biosorption experiments were conducted to find the equilibrium time and biosorption capacity. Effect of parameters like pH, temperature and initial metal concentration was studied. The maximum biosorption capacity of lead(II) and chromium(VI) was found to be 31.54 ± 0.63 and 30.21 ± 0.74 mg g-1, respectively. The optimum pH for lead(II) and chromium(VI) removal was 5 ± 0.1 and 2 ± 0.1, respectively. The temperature change, in the range of 20 - 45ºC affected the biosorption capacity. The maximum removal of lead(II) was achieved at 20 ± 2ºC, where as maximum uptake of chromium(VI) was observed at 40 ± 2ºC. The biosorption data was fitted to the Langmuir and the Freundlich...
Tipo: Journal article Palavras-chave: Biosorption; Equilibrium; Groundnut hull; Kinetics; Thermodynamics.
Ano: 2009 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582009000400003
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Biotransformation of anthracene and fluoranthene by Absidia fusca Linnemann Electron. J. Biotechnol.
Villemain,Danièle; Guiraud,Pascale; Bordjiba,Ouahiba; Steiman,Régine.
A strain of Absidia fusca was isolated from a pesticide-contaminated soil (Annaba, Algeria). The biotransformation capability of this strain towards two polycyclic aromatic hydrocarbons (PAHs): anthracene and fluoranthene was compared to that exhibited by another strain of A. fusca isolated from a non-contaminated milieu and considered as a control. The results obtained were statistically analyzed and showed that the strain isolated from the contaminated soil was more efficient than the control to remove anthracene from the medium, during all the kinetics (90% removed versus 45% after 24 hrs). Concerning fluoranthene, the amount removed by both strains was very high during the first 24 hrs however the control strain was slightly more efficient (94% versus...
Tipo: Journal article Palavras-chave: Absidia fusca; Anthracene; Biodegradation; Fluoranthene; Kinetics.
Ano: 2006 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582006000200004
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Chemical kinetics of aerobic soils and rice growth International Rice Research Institute
Kundu, Dilip Kumar.
346 l. : ill. Thesis (Ph.D.) -- Indian Agricultural Research Institute
Tipo: Thesis Palavras-chave: Rice; Soil; Soil chemistry; Kinetics; Aerobic conditions; Soil-plant interactions; Plant growth; Plant nutrition.
Ano: 1987 URL: http://hdl.handle.net/123456789/1311
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Cinética de sorção de fósforo em alguns solos de Minas Gerais. Repositório Alice
REIS, C.; FABRIS, J.D.; NOVAIS, R.F.; BAHIA FILHO, A.F.C.; SANTANA, D. P.; CURI, N.; COEY, J.M.D..
Os processos cineticos e termodinamicos envolvidos nos mecanismos de troca de fosforo no sistema fase solida-solucao do solo sao ainda pouco conhecidos. O proposito do presente trabalho foi investigar o comportamento dinamico do fosforo em sistemas multifasicos. Como fase solida, foram utilizadas as fracoes argila de onze amostras de duas pedossequencias do Estado de Minas Gerais: uma com litologia variando em proporcoes de rochas peliticas e de tufito; outra de arenito e de basalto. E proposto um modelo cinetico para descrever a dinamica de sorcao do fosforo. Estimaram-se as constantes de taxa de reacao (ki, i = + ou - 1, + ou - 2) de primeira ordem, para as duas primeiras etapas consecutivas do mecanismo multiplo de reacao. Na maior parte das amostras,...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Cinetica; Sorcao; Solos magneticos; Oxidos de ferro; Fosforo; Minas Gerais; Soils; Kinetics; Phosphorus; Sorption.
Ano: 1995 URL: http://www.alice.cnptia.embrapa.br/handle/doc/471663
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Comparative study for the kinetics of extracellular xylanases from Trichoderma harzianum and Chaetomium thermophilum Electron. J. Biotechnol.
Ahmed,Sibtain; Imdad,Syeda Sana; Jamil,Amer.
Xylanases assume special importance in the paper and pulp industry as they replace toxic chemicals such as chlorine and chlorine dioxide for developing eco-friendly processes. This study evaluated xylanases produced by two fungi, the mesophilic fungus Trichoderma harzianum and a thermophilic fungus Chaetomium thermophilum. Among the polymeric substrates studied for xylanase production by both the fungi, birch wood xylan was found to be the best inducer of xylanases. Xylanases induction was subject to glucose repression. Partially purified xylanases preparation from T. harzianum and C. thermophilum exhibited optimal activities at pH 5 and 6 and at 60ºC and 70ºC, respectively. The apparent Km and Vmax values for the partially purified xylanase from T....
Tipo: Journal article Palavras-chave: C. thermophilum; Kinetics; T. harzianum; Xylanase.
Ano: 2012 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582012000300003
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Continuous fluorescence recording as a way to improve Pacific oyster (Crassostrea gigas) models of paralytic shellfish toxin accumulation ArchiMer
Baron, Regis; Couedel, Marielle; Joret, Camille; Garen, Pierre; Truquet, Philippe; Masselin, Pierre; Bardouil, Michele; Lassus, Patrick.
A simple system was used to simulate the effect of alternating toxic (paralytic shellfish poisoning toxins) and non-toxic microalgal diets on oyster feeding behaviors and rates of toxin accumulation. These experimental conditions were meant to reflect, to some extent, the incoming and outgoing fluxes of toxic algae observed at the mouth of the Penze estuary (Northern Brittany, France). Physiological and toxicological parameters were estimated based oil fluorescence measurements recorded continuously at the outlet of each experimental tank, which contained a single oyster. Q(tox), this variable describes toxin uptake in oysters, it was used (instead of the toxin ingestion rate): i) in simple graphical analyses, ii) as well as in one- and two-compartment...
Tipo: Text Palavras-chave: Skeletonema costatum; Alexandrium minutum; Fluorescence; Modeling; Kinetics; Toxin uptake; Shellfish toxin; PSP.
Ano: 2006 URL: http://archimer.ifremer.fr/doc/2006/publication-1400.pdf
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Determination of drying characteristics and kinetics of bitter kola (garcinia kola) using page’s model CIGR Journal
Chinaka, Ehiem James.
Single-layer drying characteristics and kinetics of garcinia kola was studied with slice thicknesses of 1mm, 3mm, 5mm and 7mm at temperatures 45oC, 55oC, 65oC and 75oC using natural convention laboratory oven . The results obtained revealed that garcinia kola slices dried in the falling rate period. Moisture ratio, characteristics drying rate constant, drying time, effective diffusivity and activation energy were significantly (p
Tipo: Info:eu-repo/semantics/article Palavras-chave: Agricultural & Bioresources Engineering/Postharvest Processing and Storage Engineering Garcinia kola; Kinetics; Diffusion; Activation energy; Page’s model.
Ano: 2014 URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/2987
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Effects of pyrogenic carbon feedstock and pyrolysis temperature on the oxidation kinetic and benzene polycarboxilic acids formation. Repositório Alice
CERQUEIRA, W. V.; RITTL, T. F.; PINHEIRO, M. A.; PEREIRA NETTO, A. D.; NOVOTNY, E. H..
Pyrogenic carbon (PyC) has a high potential to soil carbon sequestration. Among the methods used to quantify PyC, the method of benzene polycarboxilic acids (BPCA) is well-established. The oxidation step of this method is essential for a reliable PyC quantification. Up to now there are no studies on the influence of feedstock and pyrolysis temperature in the oxidation kinetic of PyC and BPCA formation; and then these are the purposes of this study. For this, different PyC were oxidised at 170 ºC during different times. The data showed similar kinetic curves for all PyC, but different BPCA production depending upon feedstock and pyrolysis temperature. All PyC showed maximum production of BPCA at 6-8 h under nitric acid oxidation at 170 ºC. We concluded that...
Tipo: Artigo em anais de congresso (ALICE) Palavras-chave: Cinética de oxidação; Biochar; Ácido benzenopolicarboxílico; Quantificação de carbono pirogênico; Ácido; Carbono; Oxidação; Kinetics; Oxidation; Carbon; Acids.
Ano: 2014 URL: http://www.alice.cnptia.embrapa.br/handle/doc/1001606
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Estimation of soil nitrogen supply in lowland rice soils based on mineralization kinetics under anaerobic incubation International Rice Research Institute
Samson, Marianne I..
xv, 86 l. : ill. Thesis (M.S.) -- University of the Philippines at Los Baños,
Tipo: Thesis Palavras-chave: Rice soils; Soil nutrient balance; Nitrogen; Mineralization; Lowlands; Kinetics; Incubation.
Ano: 1997 URL: http://hdl.handle.net/123456789/571
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Exploring methane-hydrate formation and dissociation in geologic materials through laboratory experiments: Kinetic behavior and morphology ArchiMer
Ruffine, Livio.
To gain in-depth understanding of natural gas hydrate behavior it is necessary to identify key parameters that affect their formation, distribution and destabilization within sediments. Hydrate formation kinetics in porous media is amongst the aspects which deserve important considerations as it may provide useful information on the formation history and the formation mechanisms of natural gas hydrate accumulations. Yet, it is at its early stage. In this paper, experiments on methane hydrate formation and dissociation in porous media are reported and discussed. The first part of this work is devoted to the investigation of the kinetics of methane hydrate formation within silica sand using a custom-design apparatus. The latter is suitable for investigating...
Tipo: Text Palavras-chave: Geologic matrices; Hydrate morphology; Kinetics; Methane hydrates; Novel apparatus.
Ano: 2015 URL: http://archimer.ifremer.fr/doc/00245/35580/34209.pdf
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Free radical-scavenging behaviour of some north-east Brazilian fruits in a DPPH system. Repositório Alice
RUFINO, M. do S. M.; FERNANDES, F. A. N.; ALVES, R. E.; BRITO, E. S. de.
2009
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Tropical fruits; Radical scavenger; DPPH; Kinetics.
Ano: 2009 URL: http://www.alice.cnptia.embrapa.br/handle/doc/631919
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Heavy metal uptake by agro based waste materials Electron. J. Biotechnol.
Qaiser,Suleman; Saleemi,Anwar R; Mahmood Ahmad,Muhammad.
Presence of heavy metals in the aquatic systems has become a serious problem. As a result, there has been a great deal of attention given to new technologies for removal of heavy metal ions from contaminated waters. Biosorption is one such emerging technology which utilized naturally occurring waste materials to sequester heavy metals from industrial wastewater. The aim of the present study was to utilize the locally available agricultural waste materials for heavy metal removal from industrial wastewater. The wastewater containing lead and hexavalent chromium was treated with biomass prepared from ficus religiosa leaves. It was fund that a time of one hr was sufficient for sorption to attain equilibrium. The equilibrium sorption capacity after one hr was...
Tipo: Journal article Palavras-chave: Biosorption; Ficus religiosa leaves; Hexavalent chromium; Kinetics; Lead; Wastewater.
Ano: 2007 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582007000300008
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Identification, utilization, and economic impact of maize germplasm tolerant to low levels of phosphorus and toxic levels of exchangeable aluminum in brazilian soils. Repositório Alice
MAGNAVACA, R.; BAHIA FILHO, A.F.C..
1996
Tipo: Resumo em anais de congresso (ALICE) Palavras-chave: Maize; Germplasm; Soils; Acid; Phosphorus; Aluminum; Kinetics; Absorption; Milho; Corn; Germoplasma; Solo acido; Fosforo; Aluminio; Absorcao.
Ano: 1996 URL: http://www.alice.cnptia.embrapa.br/handle/doc/472506
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Interspecific comparison of Cd bloaccumulation in European Pectinidae (Chlamys varia and Pecten maximus) ArchiMer
Metian, M; Warnau, M; Oberhansli, F; Teyssie, J; Bustamante, Paco.
The uptake and loss kinetics of Cd were determined in two species of scallops from the European coasts, the variegated scallop Chlamys varia and the king scallop Pecten maximus, following exposures via seawater, phytoplankton and sediment using highly sensitive radiotracer techniques (Cd-109). Results indicate that, for seawater and dietary pathways, C. varia displays higher bioaccumulation capacities in terms of uptake rate from water and fraction absorbed from ingested food (assimilation efficiency) than Pecten maximus. Regarding sediment exposure, P. maximus displayed low steady-state Cd transfer factor (TFSS < 1); however, once incorporated, a very large part of Cd transferred from sediment (92%) was strongly retained within R maximus tissues....
Tipo: Text Palavras-chave: Subcellular distribution; Scallops; Metal; Kinetics; Cadmium; Bivalves.
Ano: 2007 URL: http://archimer.ifremer.fr/doc/2007/publication-3581.pdf
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Kinetic analysis of inhibitor actions on enzymes. Repositório Alice
BRUNE, W.; FABRIS, J.D.; OLIVEIRA, A.C. de; OLIVEIRA, T.T.; NAGEM, T.J..
Um conjunto de dados, com alta dispersao experimental, de uma reacao de inibicao de uma peroxidase por quecertina foi usado para demonstrar o modo pelo qual e possivel, atraves de manipulacao grafica e de analise de regressao linear, obter resultados estatisticamente interpretaveis sobre o mecanismo da inibicao enzimatica. O modelo cinetico mais provavel da reacao foi estabelecido como sendo o de uma inibicao nao-competitiva mista. O procedimento estatistico aqui proposto (i) revelou-se relativamente simples, geral e metodo nao ambiguo de analise numerica em cinetica enzimatica envolvendo inibicao, baseado em regressoes lineares consecutivas, e que nao requer, necessariamente, o estabelecimento previo de uma hipotese do tipo de inibicao; (ii) pos em...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Michaelis-Menten; Cinetica; Inibicao; Kinetics; Inhibition.
Ano: 1997 URL: http://www.alice.cnptia.embrapa.br/handle/doc/92506
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Kinetic and isotherm studies of copper (II) removal from wastewater using various adsorbents OceanDocs
Abdel Wahab, O..
The present investigation deals with the utilization of marine green algae (GA), Ulva lactuca, and an activated carbon prepared from green algae (CGA) as adsorbents for the removal of copper from wastewater. A series of experiments were conducted in a batch system to evaluate the effect of system variables. The effect of pH, initial copper concentration, dose of adsorbents were considered. The optimal pH value of copper (II) adsorption onto GA and CGA was found to be pH 5.0. The maximum uptake capacities were 24.5 and 32.3 mg copper (II) per gram of GA and CGA, respectively. The efficiency of removal was slightly changed by replacing an aqueous solution by saline water or wastewater containing the same copper concentration. Adsorption kinetic data were...
Tipo: Journal Contribution Palavras-chave: Laboratory Study; Adsorption; Kinetics; Isotherms; Waste water; Adsorption; Http://aims.fao.org/aos/agrovoc/c_137.
Ano: 2007 URL: http://hdl.handle.net/1834/1910
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Kinetics and energetics of phosphate release from tropical soils determined by mixed ion-exchange resins. Repositório Alice
AGBENIN, J. O.; RAIJ, B. V..
bitstream/item/175245/1/Agbenin-Kinetics-2001.pdf
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Fosfato; Kinetics.
Ano: 2001 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1090429
Registros recuperados: 32
Primeira ... 12 ... Última
 

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