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| Registros recuperados: 27 | |
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| Tijerina Castro, Guillermo Daniel. |
| La degradación del suelo causada por la gran diversidad de contaminantes tóxicos orgánicos e inorgánicos está causando un deterioro que reduce la producción y calidad de alimentos; la fitorremediación es una tecnología para revertir estos daños. Al caracterizar 223 aislamientos bacterianos (velocidad de crecimiento, tamaño, producción de pigmentos, patogenicidad y efecto en la germinación), colectados en muestras de suelo y de raíz en nueve sitios del predio del Colegio de Postgraduados, Montecillo México, se encontró que 51.6% de los aislamientos fueron de muestras de suelo y 41.8% de raíz, en cuanto a velocidad de crecimiento se encontró que 31.8% fueron de crecimiento rápido, 37.6% intermedio y el 30.5% de crecimiento lento, por tamaño de la colonia... |
| Tipo: Tesis |
Palavras-chave: Fitorremediación; Patogenicidad; Bacillus; Fluorescentes; Acumulación; Maestría; Genética; Phytoremediation; Pathogenic effect; Fluorescent; Accumulation. |
| Ano: 2008 |
URL: http://hdl.handle.net/10521/1655 |
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| Kondajii, N; Menon, N. |
| It is understood that the rate of bioaccumulation and subsequent depuration of heavy metals in marine animals is influenced by the chemical state, as well as the kinetics of transformation between different species of chemical salts dissolved in water. The Indian Brown mussel, Perna indica, was exposed to copper nitrate and chloride, individually, to analyse the rate of accumulation, depuration, oxygen uptake and filtration rates. When supplied in very low quantities, environmentally realistic concentrations, the rate of accumulation of copper nitrate and chlorides showed variations. When the animals were transferred to sea water, these two salts did not show any clear cut differences in the depuration rate. Irrespective of the previous accumulation... |
| Tipo: Text |
Palavras-chave: Perna indica; Bivalvia; Chlorides; Copper; Mussel culture; Heavy metals; Marine pollution; Accumulation; Self purification. |
| Ano: 1992 |
URL: http://archimer.ifremer.fr/doc/1992/acte-1603.pdf |
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| Bustamante, Paco; Teissier, J.l; Warnau, M. |
| Laboratory radiotracer experiments were performed to study the uptake, assimilation and retention of americium (241Am) and cesium (134Cs) by the common cuttlefish Sepia officinalis. Uptake and loss kinetics of the radionuclides were measured following exposure through sediments, seawater and food at different stages of the animal's life cycle. Sediment was found to be a minor uptake pathway for both radionuclides in juveniles. Following a short seawater exposure, cuttlefish accumulated 241Am and 134Cs, but only to a limited extent (whole-body CF < 2). Among the cuttlefish organs, branchial hearts and their appendages displayed the highest degree of uptake for 241Am (CF = 42 and 16, respectively), but these tissues contained low percentage of total 241Am... |
| Tipo: Text |
Palavras-chave: Retention; Radionuclides; Cephalopods; Biokinetics; Accumulation. |
| Ano: 2006 |
URL: http://archimer.ifremer.fr/doc/2006/publication-1872.pdf |
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| Mounicou, S.; Frelon, S.; Le Guernic, A.; Eb-levadoux, Y.; Camilleri, V.; Fevrier, L.; Pierrisnard, S.; Carasco, L.; Gilbin, R.; Mahé, Kelig; Tabouret, Helene; Bareille, G.; Simon, O.. |
| This study aimed to determine uranium (U) pollution over time using otoliths as a marker of fish U contamination. Experiments were performed in field contamination (~20 μg L−1: encaged fish: 15d, 50d and collected wild fish) and in laboratory exposure conditions (20 and 250 μg L−1, 20d). We reported the U seasonal concentrations in field waterborne exposed roach fish (Rutilus rutilus), in organs and otoliths. Otoliths were analyzed by ICPMS and LA-ICP SF MS of the entire growth zone. Concentrations were measured on transects from nucleus to the edge of otoliths to characterize environmental variations of metal accumulation. Results showed a spatial and temporal variation of U contamination in water (from 51 to 9.4 μg L−1 at the surface of the water... |
| Tipo: Text |
Palavras-chave: Roach; Accumulation; Laser ablation ICP-MS. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00505/61622/65534.pdf |
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| Hess, Philipp; Abadie, Eric; Herve, Fabienne; Berteaux, Tom; Sechet, Veronique; Araoz, Romulo; Molgo, Jordi; Zakarian, Armen; Sibat, Manoella; Rundberget, Thomas; Miles, Christopher O.; Amzil, Zouher. |
| Following a review of official control data on shellfish in France, Ingril Lagoon had been identified as a site where positive mouse bioassays for lipophilic toxins had been repeatedly observed. These unexplained mouse bioassays, also called atypical toxicity, coincided with an absence of regulated toxins and rapid death times in mice observed in the assay. The present study describes pinnatoxin G as the main compound responsible for the toxicity observed using the mouse bioassay for lipophilic toxins. Using a well-characterised standard for pinnatoxin G, LC-MS/MS analysis of mussel samples collected from 2009 to 2012 revealed regular occurrences of pinnatoxin G at levels sufficient to account for the toxicity in the mouse bioassays. Baseline levels of... |
| Tipo: Text |
Palavras-chave: Cyclic imines; Shellfish toxin; Accumulation; Liquid chromatography coupled to tandem mass spectrometry (LC-MS/MS); Unexplained mouse toxicity. |
| Ano: 2013 |
URL: http://archimer.ifremer.fr/doc/00158/26960/25255.pdf |
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| Meddeb, M.; Ben Othman, H.; Hadj Mabrouk, H.; Sakka Hlaili, A.. |
| Cette étude s’est intéressée à déterminer l’effet du Benzo [a]pyrène, un contaminant organique de la famille des HAP, sur la communauté bactérienne planctonique, au niveau de la lagune (zone faiblement polluée par le B[a]py) et le canal (zone très polluée par le B[a]py) de Bizerte en été et automne 2009. Des communautés bactériennes, collectées des deux stations, ont été maintenues en culture pendant 6 jours sous trois différents traitements, un témoin (non contaminé) et deux contaminations avec 0,5 mg l-1 (B[a]py1) et 1 mg l-1 (B[a]py2) du B[a]py. Au cours de l’incubation, l’abondance, le taux de production et le taux de croissance du bactérioplancton ont été déterminés. En juillet, le bactérioplancton a présenté, dans le milieu naturel de la lagune, une... |
| Tipo: Journal Contribution |
Palavras-chave: Nannoplankton; Accumulation; Biological production; Growth. |
| Ano: 2013 |
URL: http://hdl.handle.net/1834/5904 |
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| El Cafsi., M.; Kheriji., S.; Masmoudi., W.; Romdhane., M.S.. |
| Le suivi de l’évolution des lipides des alevins de Mugil cephalus en fonction de la salinité et de la température du milieu, montre qu’après acclimatation à 14°C, le rapport acides gras polyinsaturés/acides gras saturés, chez les alevins acclimatés à la basse salinité (0,5‰) augmente de 6,5%. D’autre part, nous avons noté une diminution de 65% de la masse des triacylglycérols et une augmentation de 37% de celle des lipides polaires. Par ailleurs, nous avons relevé que l’abaissement de la température du milieu de 26 à 14°C, entraîne une augmentation plus importante du rapport acides gras polyinsaturés/acides gras saturés à 0,5‰ qu’à 35‰. La diminution de la température du milieu provoque une augmentation respective de 365 et de 53%, de la masse des... |
| Tipo: Journal Contribution |
Palavras-chave: Biochemical composition; Salinity; Lipids; Fry; Fatty acids; Temperature; Accumulation; Mugil cephalus; Http://aims.fao.org/aos/agrovoc/c_35403. |
| Ano: 2000 |
URL: http://hdl.handle.net/1834/4296 |
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| El-Sarraf, W.M.. |
| Results of the investigation carried out in Lakes Mariut and Edku revealed that the trace metals concentrations in ceratophyllum demersum is relatively higher than that in Potamogeton pectinatus. The protein and trace metals in macrophytes collected from unpolluted areas is lower thjan that form polluted ones. Eichhornia crassipes can have a restricted role for the treatment of lake water. In Lake Edku, the results of chemical composition of sediments agree with the previous studies. The trace metal content of C. demersum was higher than that of P. pectinatus. The higher organic carbon level was recorded in stems of submerged plants and in leaves of floating ones. On the other hand, the high concentration of trace metal was observed in leaves of submerged... |
| Tipo: Journal Contribution |
Palavras-chave: Accumulation; Marine environment; Marine environment; Http://aims.fao.org/aos/agrovoc/c_4610. |
| Ano: 1995 |
URL: http://hdl.handle.net/1834/1244 |
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| Nachtigall,Gilmar Ribeiro; Dechen,Antonio Roque. |
| The nutrient accumulation curves of apple trees are good indicators of plant nutrient demand for each developmental stage. They are also a useful tool to evaluate orchard nutritional status and to estimate the amount of soil nutrient removal. This research aimed at evaluating the seasonality of nutrients in commercial apple orchards during the agricultural years of 1999, 2000, and 2001. Therefore, apple tree leaves and fruits of three cultivars 'Gala', 'Golden Delicious' and 'Fuji' were weekly collected and evaluated for fresh and dry matter, fruit diameter and macronutrient (N, P, K, Ca and Mg) and micronutrient (B, Cu, Fe, Mn, and Zn) concentrations. Leaf and fruit sampling started one or two weeks after full bloom, depending on the cultivar, and ended... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Malus domestica; Macronutrients; Micronutrients; Accumulation. |
| Ano: 2006 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162006000500012 |
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| Registros recuperados: 27 | |
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