Spiked Sediment
Mostrando 1-12 de 13 artigos, teses e dissertações.
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1. Avaliação ecotoxicológica do fármaco Triclosan para invertebrados de água doce com ênfase em ensaios com sedimento marcado (\"spiked sediment\") / Ecotoxicological assessment of the pharmaceutical compound Triclosan to freshwater invertebrates with emphasis to spiked sediment tests
O aumento crescente da ocorrência de fármacos e produtos de cuidados pessoais (Pharmaceutical and Personal Care Products PPCPs) no ambiente aquático pode causar efeitos adversos à saúde humana e às comunidades aquáticas. O risco ambiental dos PPCPs, associado à possibilidade de efeitos sinérgicos entre estes compostos, assim como o aumento do uso de
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 10/02/2010
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2. Um novo método para quantificar mercúrio orgânico (Hg orgânico) empregando a espectrometria de fluorescência atômica do vapor frio
In this work a simple and sensitive procedure to extract organic mercury from water and sediment samples, using methylene chloride in acidic media followed by CVAFS quantification has been developed. The method was evaluated for possible interferents, using different inorganic mercury species and humic acid, no effects being observed. The detection limit for
Química Nova. Publicado em: 2006-12
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3. Fotoprodução de peroxidos de hidrogenio em aguas naturais sob a ação da luz solar
The photoproduction of hydrogen peroxide was investigated under simulated and natural conditions. Solutions containing a well characterised sediment and a commercial humic acid were used as sources of particulate matter and dissolved organic matter, respectively. In a 30 mg.L sediment suspension 0.31 mmol.L of H2O2 were generated after 5 h irradiation and 1.
Publicado em: 1994
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4. Partição do cadmio entre o sedimento e a agua intersticial
Cadmium partitioning in the interstitial water of some sediments was evaluated using two different analytical techniques: anodic stripping voltametry (ASV) and atomic absorption spectrophotometry (AAS). Four samples of different sediments were investigated in this work. Two samples from Paranoá Lake (DF), containning 14.6% and 16.8% of organic matter; a thi
Publicado em: 1991
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5. Recovery of putative taeniid eggs from silt in water associated with an outbreak of bovine cysticercosis
Degenerate taeniid-like eggs consistent with Taenia saginata were recovered from sediment in the water supply of a beef feedlot under quarantine for Cysticercus bovis. Nine degenerate eggs in total were recovered from 482 modified flotation assays. Flotation controls of sediment spiked with known numbers of T. saginata eggs had poor egg recoveries, supportin
Canadian Veterinary Medical Association.
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6. Detection of hepatitis A virus, rotavirus, and enterovirus in naturally contaminated shellfish and sediment by reverse transcription-seminested PCR.
A reverse transcription-PCR method was developed to detect enterovirus (EV), hepatitis A virus (HAV), and rotavirus (RV) RNAs in shellfish and sediment. The method was first tested under experimental conditions by using virus-spiked shellfish to evaluate assay sensitivity. The use of CC41 cellulose was found to be efficient for removing inhibitors of RV dete
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7. Sulfate-Reducing Bacteria: Principal Methylators of Mercury in Anoxic Estuarine Sediment †
Substrate-electron acceptor combinations and specific metabolic inhibitors were applied to anoxic saltmarsh sediment spiked with mercuric ions (Hg2+) in an effort to identify, by a direct approach, the microorganisms responsible for the synthesis of hazardous monomethylmercury. 2-Bromoethane sulfonate (30 mM), a specific inhibitor of methanogens, increased m
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8. Impact of Irradiation and Polycyclic Aromatic Hydrocarbon Spiking on Microbial Populations in Marine Sediment for Future Aging and Biodegradability Studies
Experiments were carried out to develop methods to generate well-characterized, polycyclic aromatic hydrocarbon (PAH)-spiked, aged but minimally altered sediments for fate, biodegradation, and bioavailability experiments. Changes in indigenous bacterial populations were monitored in mesocosms constructed of relatively clean San Diego Bay sediments, with and
American Society for Microbiology.
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9. Distribution of Hydrocarbon-Utilizing Microorganisms and Hydrocarbon Biodegradation Potentials in Alaskan Continental Shelf Areas
Hydrocarbon-utilizing microorganisms were enumerated from Alaskan continental shelf areas by using plate counts and a new most-probable-number procedure based on mineralization of 14C-labeled hydrocarbons. Hydrocarbon utilizers were ubiquitously distributed, with no significant overall concentration differences between sampling regions or between surface wat
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10. Transformations of chloroguaiacols, chloroveratroles, and chlorocatechols by stable consortia of anaerobic bacteria.
Metabolically stable consortia of anaerobic bacteria obtained by enrichment of sediment samples with 3,4,5-trimethoxybenzoate (TMBA), 3,4,5-trihydroxybenzoate (gallate [GA]), or 5-chlorovanillin (CV) were used to study the anaerobic transformation of a series of chloroveratroles, chloroguaiacols, and chlorocatechols used as cosubstrates. Experiments were car
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11. Detection and Quantification of Methyl tert-Butyl Ether-Degrading Strain PM1 by Real-Time TaqMan PCR
The fuel oxygenate methyl tert-butyl ether (MTBE), a widely distributed groundwater contaminant, shows potential for treatment by in situ bioremediation. The bacterial strain PM1 rapidly mineralizes and grows on MTBE in laboratory cultures and can degrade the contaminant when inoculated into groundwater or soil microcosms. We applied the TaqMan quantitative
American Society for Microbiology.
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12. Isolation and Characterization of Polycyclic Aromatic Hydrocarbon-Degrading Bacteria Associated with the Rhizosphere of Salt Marsh Plants
Polycyclic aromatic hydrocarbon (PAH)-degrading bacteria were isolated from contaminated estuarine sediment and salt marsh rhizosphere by enrichment using either naphthalene, phenanthrene, or biphenyl as the sole source of carbon and energy. Pasteurization of samples prior to enrichment resulted in isolation of gram-positive, spore-forming bacteria. The isol
American Society for Microbiology.