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Registros recuperados: 27
Primeira ... 12 ... Última
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Accumulation and depuration of hydrocarbons in the mangrove oyster Crassostrea rhizophorae ArchiMer
Delcastillo, C; Corredor, J; Morell, J.
Adult specimens of Crassostrea rhizophorae were exposed to diesel oil dispersed in seawater. The experiment consisted of a 10 days contamination period and 15 days depuration period. Oyster samples were extracted, and analysed by gas chromatography and UV fluorescence spectroscopy. The concentrations of n-alkanes, branched alkanes, unresolved complex mixture (UCM) and aromatic hydrocarbons were determined. The oysters accumulated the hydrocarbons rapidly, reaching a maximum concentration of 387.5 ug/g (wet weight). After exposure to uncontaminated seawater, the oysters were able to reduce their hydrocarbon load to 5.6 ug/g. The data indicates that C. rhizophorae is capable of preferential accumulation and depuration of hydrocarbons. Apparently, the oysters...
Tipo: Text Palavras-chave: Crassostrea rhizophorae; Bivalvia; Fluorescence spectroscopy; Gas chromatography; Oyster culture; Hydrocarbons; Marine pollution; Accumulation; Self purification.
Ano: 1992 URL: http://archimer.ifremer.fr/doc/1992/acte-1602.pdf
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Accumulation du cadmium par Mytilus edulis en présence de bactéries marines sensibles ou résistantes à ce metal ArchiMer
Flatau, Gilles N.; Gauthier, Michel J.
The cadmium accumulation by the soft parts of the mussels increased in the presence of the sensitive strain, and was lower in the presence of the resistant strain, when only ionic metal was given to the mussels. The metal brought by previously contamined and killed bacteria was more accumulated by the different organs than when it was provided in the ionic form, and was more accumulated by viscera and gills when it was bound to the resistant bacteria.
Tipo: Text Palavras-chave: Cadmium; Accumulation; Moule; Bactéries marines; Résistance.
Ano: 1982 URL: http://archimer.ifremer.fr/doc/00306/41754/40965.pdf
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Accumulation of gamma-aminobutyric acid (GABA) in non-waxy and waxy rice germ during water soaking Thai Agricultural
Patcharee Tungtrakul; Warunee Varanyanond; Vipa Surojanametakul; Ladda Wattanasiritham.
Rice germ contains protein, vitamins, minerals, dietary fiber and gamma-aminobutyric acid (GABA). GABA has been proved to be effective for lowering the blood pressure of human being. It has neurotransmission functions and tranquilizer effects. determination of GABA in rice germ and brown rice were investigated by using low-amylose, high-amylose and waxy rice cultivars. Percentage of germ weight showed no relation to the GABA content. The amount and patterns of the GABA accumulation varied depending on the cultivar. GABA content in most of rice varieties increased during incubation. The accumulation of gamma-aminobutyric acid (GABA) in non-waxy and waxy rice germ during water soaking were determined by using 14 different cultivars. Water soaking can enrich...
Tipo: PhysicalObject Palavras-chave: Accumulation; GABA; Rice germ; Gamma-aminobutyric acid; Waxy rice; ข้าวเจ้า; ข้าวเหนียว; คัพภะ; กรดแกมมา-แอมิโนบิวเทริก; การแช่น้ำ.
Ano: 2006 URL: http://anchan.lib.ku.ac.th/agnet/handle/001/5140
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Accumulation versus remobilization of mercury in sediments of a contaminated lagoon IPB - Escola Superior Agrária
Ramalhosa, Elsa; Pato, P.; Monterroso, Paulo; Pereira, Eduarda; Vale, C.; Duarte, A.C..
This work discusses the extent of sediment mercury retention in the most contaminated sites in the lagoon, and its exportation to the water column as well as transfer to biogenic suspended particles and to sea bass (Dicentrarchus labrax). Therefore,the main question, with important environmental management implications, was to assess if mercury is effectively retained in the sediments or is progressively released to the water column in considerable amounts.
Tipo: Article Palavras-chave: Mercury; Sediments; Accumulation; Remobilization.
Ano: 2006 URL: http://hdl.handle.net/10198/3956
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Assessment of the exposure pathway in the uptake and distribution of americium and cesium in cuttlefish (Sepia officinalis) at different stages of its life cycle ArchiMer
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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Biochemical effect of aquatic environmental pollution on the fishermen health OceanDocs
Saad, A.A.; El-Sekeily, A.M.; Moafy, N.M.; Youssef, A.I..
This study is an attempt to describe a human health risk assessment as a function of recreationl activities in relation to environmental pollution of El-Mex bay through studying the Haemoglobin-adducts (Hb-adducts) of three aromatic amines namely benzidine, alpha and beta naphthylamine as biomarker for exposure as well as biochemical effects of these pollutants on fishermen in this area, beside the determination of these substances in the tissues of 2 types of fish at the same area. The sturdy was conducted on 21 control male subjects and 78 volunteers fishermen, all the 99 subjects were chosen to be smokers. Blood glutathione content was significantly decreased in fislrermen compared with controls. On the other hand glutathione-S-transferase,...
Tipo: Journal Contribution Palavras-chave: Accumulation; Biological data; Pollution control; Aquatic environment; Health; Pollution control; Biological indicators; Http://aims.fao.org/aos/agrovoc/c_6078; Http://aims.fao.org/aos/agrovoc/c_25632.
Ano: 2004 URL: http://hdl.handle.net/1834/1211
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Biomassa, concentração e conteúdo de nutrientes em cinco espécies de Eucalyptus plantadas em solos de baixa fertilidade. Repositório Alice
SILVA, H. D. da; POGGIANI, F.; COELHO, L. C..
Com o objetivo de estimar a concentração de nutrientes nas folhas, ramos, casca, lenho e o conteúdo de nutrientes, em função da biomassa produzida no tronco, utilizou-se um ensaio de competição envolvendo as espécies Eucalyptus grandis (Hill) Maiden, E. saligna Smith, E. propinqua Deane et Maiden, E. dunnii Maiden e E. robusta Smith, com 10 anos de idade, todas de origem e procedências australianas, plantadas em solos arenosos e de baixa fertilidade, em Itirapina - SP. As espécies que produziram maiores quantidades de biomassa oriunda do tronco foram E. saligna e E. grandis. Os nutrientes concentraram-se, de forma decrescente, nas folhas, ramos, casca e lenho. E. grandis foi a que apresentou maior acúmulo de nitrogênio (N), fósforo (P) e potássio (K) e...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Nutriente; Concentracao; Acumulo; Eucalyptus grandis; Eucalyptus saligana; Eucalyptus propinqua; Eucalyptus dunnii; Eucalyptus robusta; Nutrient; Content; Accumulation.
Ano: 1983 URL: http://www.alice.cnptia.embrapa.br/handle/doc/282259
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Chemical analysis of some macrophytes in Mariut and Edku lakes, Egypt OceanDocs
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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Chemical composition of some marine algae from the mediterranean sea of alexandria, egypt OceanDocs
El-Sarraf, W.M.; El-Shaarawy, G..
No abstract is included
Tipo: Journal Contribution Palavras-chave: Accumulation; Bioaccumulation; Biochemical composition; Algae; Bioaccumulation.
Ano: 1994 URL: http://hdl.handle.net/1834/1243
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Cyanobacterial toxins in Portugal: effects on aquatic animals and risk for human health BJMBR
Vasconcelos,V.M..
Toxic cyanobacteria are common in Portuguese freshwaters and the most common toxins are microcystins. The occurrence of microcystin-LR (MCYST-LR) has been reported since 1990 and a significant number of water reservoirs that are used for drinking water attain high levels of this toxin. Aquatic animals that live in eutrophic freshwater ecosystems may be killed by microcystins but in many cases the toxicity is sublethal and so the animals can survive long enough to accumulate the toxins and transfer them along the food chain. Among these, edible mollusks, fish and crayfish are especially important because they are harvested and sold for human consumption. Mussels that live in estuarine waters and rivers where toxic blooms occur may accumulate toxins without...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Cyanobacteria; Toxins; Risk; Human health; Microcystins; Accumulation.
Ano: 1999 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X1999000300001
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DEFORESTATION AND ASSET ACCUMULATION AMONG SMALL SCALE FARMERS AgEcon
Takasaki, Yoshito.
This paper explores deforestation and asset accumulation among small scale farmers in tropical forests. In a two-state variable control model, forest clearing is an investment in land holdings and the productivity of forest clearing is a function of non-land assets like chainsaws. Comparative static analyses demonstrate that: (1) the addition of non-land asset accumulation options may or may not change the impacts of policy measures on deforestation, depending on labor market conditions; and (2) discount rate decreases (through for example credit subsidies) offer the prospect of a win-win scenario-- forest protection and asset accumulation-- only when an active labor market exits.
Tipo: Conference Paper or Presentation Palavras-chave: Deforestation; Accumulation; Community/Rural/Urban Development; Land Economics/Use; Resource /Energy Economics and Policy; Q12; O13.
Ano: 2000 URL: http://purl.umn.edu/21786
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Depuration of copper nitrate and chloride in the Indian brown mussel Perna indica ArchiMer
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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Determination of vanadium accumulation in onion root cells (Allium cep a L.) and its correlation with toxicity Biocell
Marcano,Letty; Carruyo,Ingrid; Fernández,Yusmary; Montiel,Xiomara; Torrealba,Zaida.
The vanadium is a metal that presents great interest from the toxicological point of view, because of the numerous alterations that can take place in different biological systems. This work evaluated the capacity of vanadium accumulation and its correlation with genotoxic effects in root cells of Allium cepa L. The bulbs were cultivated in renovated filtered water each 24 h, at a temperature of 25 ± 0.5 ° C, in darkness and constant aeration. Treatments were carried out under the same experimental conditions, using water solutions of vanadium of 25, 50, 75 and 100 µ g/g for 0, 12, 24, 48 and 72 h. A control was carried out where metal solution was substituted by distilled water. After the treatment, the meristems were fixed with alcohol - acetic acid (3:1)...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Root cells; Vanadium; Toxicity; Accumulation; GFAAS.
Ano: 2006 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0327-95452006000200001
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Effects of phosphorus on polyphosphate accumulation by Cunninghamella elegans BJM
Lima,Marcos Antonio Barbosa de; Nascimento,Aline Elesbão do; Souza,Wanderley de; Fukushima,Kazutaka; Campos-Takaki,Galba Maria de.
The content of inorganic polyphosphate and the polymeric degree of these compounds were evaluated during the growth of Cunninghamella elegans in medium containing varying orthophosphate (Pi) concentrations. For this purpose, a combination of chemical methods for polyphosphate extraction and ultrastructural cytochemistry were used. The orthophosphate and glucose consumption was also determined during the fungal cultivation. At Pi concentrations of 0.5, 2.5 and 0.0 g/L, the maximum amounts of biomass were 3.18, 3.29 and 0.24 g/L, respectively. During growth the cells accumulated Pi from the medium. At three days of growth the biomass consumed up to 100 and 95% of Pi from the media at initial concentrations of 0.5 and 2.5 g/L, respectively. Polyphosphate was...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Polyphosphate; Accumulation; Ultrastructural cytochemistry; Cunninghamella elegans; Ortophosfate.
Ano: 2003 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822003000400016
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Effects of sub-lethal exposure of lead acetate on histopathology of gills, liver, kidney and muscle and its accumulation in these organs of Clarias gariepinus BABT
Al-Balawi,Hmoud Fares Alkahem; Al-Akel,Ali Sulaiman; Al-Misned,Fahad; Suliman,El Amin Mohamed; Al-Ghanim,Khalid Abdullah; Mahboob,Shahid; Ahmad,Zubair.
The aim of this work was to study the effects of sub-lethal exposure of lead acetate on the histopathology of the gills, liver, kidney and muscle and its accumulation in these organs of Clarias gariepinus. Results showed that lead accumulation in the tissues of C. gariepinus was dependent on the exposure period and lead concentration. Gills and liver were the predominant storage tissue and the order of accumulation in tissues was gill > liver > kidney > muscle. Some structural changes were observed in different organs, especially in the gills of the fishes exposed to lead acetate. Epithelial hypertrophy and epithelial lifting were apparent in the gills of exposed fishes. The degeneration of cytoplasm and secondary lamellae was also observed....
Tipo: Info:eu-repo/semantics/article Palavras-chave: Clarias gariepinus; Lead acetate; Accumulation; Histopathology.
Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132013000200015
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Effet du Benzo [a] pyrène sur la croissance et la production du bactérioplancton provenant du canal et de la lagune de Bizerte OceanDocs
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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Effets de la salinité et de la température du milieu sur le degré de saturation des acides gras et sur les différentes catégories lipidiques des alevins de Mugil cephalus. OceanDocs
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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Micronutrients accumulation at different maize development stages Ciência e Agrotecnologia
Borges,Iran Dias; Von Pinho,Renzo Garcia; Pereira,José Luiz de Andrade Rezende.
The study of micronutrients accumulation as a function of plant development stage is of fundamental importance to subsidize strategies for fertilizer application and minimum amount to maintain soil fertility. This study evaluated micronutrient accumulation in two maize cultivars at different development stages. The experimental design was randomized blocks with four replications in split-plots, with two maize hybrids as the plots and sampling time according to development stages as sub-plots. Maize accumulated minimum amounts of B, Cu, Mn, and Zn in the initial stages of development, and the maximum accumulated values were observed after 100 days seedling emergency. The evaluated hybrids accumulated maximum of Zn and Cu close to physiological maturity....
Tipo: Info:eu-repo/semantics/article Palavras-chave: Zea mays; Accumulation; Nutrients; Cultivars.
Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542009000400011
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Pinnatoxin G is responsible for atypical toxicity in mussels (Mytilus galloprovincialis) and clams (Venerupis decussata) from Ingril, a French Mediterranean lagoon ArchiMer
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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Presencia de veneno paralizante de moluscos en higado de caballa de la región costera bonaerense OceanDocs
Carreto, J.I.; Akselman, R.; Cucchi Colleoni, A.D.; Carignan, M.O.; Pájaro, M..
During november 1992 an intense bloom of the toxic dinoflagellate Alexandrium tamarense accurred in coastal waters from Mar del Plata, Argentina. Toxicity testing of Mytilus edulis populations of the region revealed high levels of paralytic shellfish poison. In order to study the possible PSP accumulation in mackerel (Scomber japonicus), mouse bioassay(AOAC) was performed in livers from individuals captured during December 1992. Liver extracts were lethal to mice; the sumptoms observed were typical of those caused by paralytic shellfish toxins. Although PSPS concentration is below the established limit for human consumption, it suggests that mackerel can accumulate PSP toxins from its food. On the basis of stomach content analysis of sampled mackerel and...
Tipo: Journal Contribution Palavras-chave: Toxicity; Accumulation; Algal blooms; Toxicity; Algal blooms; Http://aims.fao.org/aos/agrovoc/c_7826; Http://aims.fao.org/aos/agrovoc/c_32367.
Ano: 1993 URL: http://hdl.handle.net/1834/2572
Registros recuperados: 27
Primeira ... 12 ... Última
 

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