Biogenic Concentration
Mostrando 13-24 de 26 artigos, teses e dissertações.
-
13. Determinação de fontes de hidrocarbonetos policíclicos aromáticos e alifáticos em sedimentos de ambientes aquáticos
Numerical values of polycyclic aromatic hydrocabons and n-alkanes distribution indexes of sediments are important tools to elucidate the origins of hydrocarbons mixtures. Polycyclic aromatic ratios are sensitive indicators of petrogenic and pyrogenic inputs, while n-alkanes distribution usualy discriminates biogenic from petrogenic sources. The study area of
Publicado em: 2006
-
14. "Marcadores orgânicos geoquímicos em testemunhos de sedimento do Sistema Estuarino de Santos e São Vicente, SP: um registro histórico da introdução de hidrocarbonetos no ambiente marinho" / Geochemical organic markers in sediment cores of the Santos-São Vicente Estuary, SP: a historical register of the introduction of hydrocarbons in the marine environment
Estuarine areas are environments between land and ocean, where human activities are intensively developed. The Santos and São Vicente Estuary, located on the central portion of the coast of São Paulo state, has one of the most important industrial areas of Brazil. The increasing of urbanization and industrialization near the margins of Estuary, in the 50
Publicado em: 2005
-
15. Estudo do comportamento eletroquimico de aminas biogenicas na presença de carboxilatos utilizando eletrodo de gota pendente de mercurio
The interest in the redox chemistry of biogenic amines, particularly dopamine (DA), is based on the fact that many of these compounds are directly involved in neurotransmission processes and, consequently, related to neurological disorders, like Parkinson and Alzheimer s diseases. The electrochemical determination of phenolic compounds using solid electrodes
Publicado em: 2003
-
16. Identificação dos Principais Fatores de Controle do Aporte Atmosférico de Substâncias Inorgânicas no Maciço do itatiaia - RJ
The aim this work was to evaluate the atmospheric deposition of main ions in a remote site of Rio de Janeiro State (RJ). Dry/wet deposition were sampled weekly through automatic precipitation collectors in two sites in the Itatiaia National Park,during a complete seasonal cycle (January 1999 to January 2000). Sampling sites were located at the Itatiaia Natio
Publicado em: 2001
-
17. Caracterização dos fluidos H2S e agua em reservatorios carbonaticos
Reservoir fluids from two basins - Campos and Santos - of East Brazil margin have been studied. Samples from over 16 wells have been utilized in the fluid characterization. Water and hydrogen sulphide (H_) are fluids with large distribution in petroleum fields and may provide important informations for reservoir studies. High H2S concentratios are normally a
Publicado em: 1993
-
18. Effects of whole body vibration on biogenic amines in rat brain.
The effects of whole body vibration on the concentrations of noradrenaline (NA), dopamine (DA), and serotonin (5-HT) in the whole brain and brain regions of rats were investigated. Compared with control rats, vibration with 20 Hz frequency decreased the brain concentration of NA only when the acceleration (intensity) was increased to 5.0 G (p less than 0.05)
-
19. Accumulation of 1-trans-2,3-epoxysuccinic acid and succinic acid by Paecilomyces varioti.
The biogenic acids 1-trans-2,3-epoxysuccinic acid and succinic acid accumulate in decationized refiner's blackstrap molasses shake cultures of Paecilomyces varioti Bainier. The maximum accumulation of 1-trans-2,3-epoxysuccinic acid occurred in a medium which contained Cu2+ and Fe3+ at concentrations of 1.0 and 2.0 mM, respectively. The maximum accumulation o
-
20. The non-enzymatic hydrolysis of oligoribonucleotides VI. The role of biogenic polyamines.
Single-stranded oligoribonucleotides containing UA and CA phosphodiester bonds can be hydrolyzed specifically under non-enzymatic conditions in the presence of spermidine, a biogenic amine found in a wide variety of organisms. In the present study, the rate of oligonucleotide and tRNA(i)(Met)hydrolysis was measured in the presence of spermidine and other bio
-
21. Effect of Nitrate on Biogenic Sulfide Production
The addition of 59 mM nitrate inhibited biogenic sulfide production in dilute sewage sludge (10% [vol/vol]) amended with 20 mM sulfate and either acetate, glucose, or hydrogen as electron donors. Similar results were found when pond sediment or oil field brines served as the inoculum. Sulfide production was inhibited for periods of at least 6 months and was
-
22. Immobilization of Radionuclides and Heavy Metals through Anaerobic Bio-Oxidation of Fe(II)
Adsorption of heavy metals and radionuclides (HMR) onto iron and manganese oxides has long been recognized as an important reaction for the immobilization of these compounds. However, in environments containing elevated concentrations of these HMR the adsorptive capacity of the iron and manganese oxides may well be exceeded, and the HMR can migrate as solubl
American Society for Microbiology.
-
23. Spiperone: evidence for uptake into secretory granules.
Spiperone, a dopamine antagonist widely used as a specific ligand for dopamine and serotonin receptors, is actively accumulated into the F4C1 strain of rat pituitary tumor cells. The accumulation of 10 nM [3H]spiperone was linear for 3 min and reached a steady state after 10 min. Spiperone accumulation was reduced 50% by preincubation with 5 microM reserpine
-
24. Retinoic Acid Activates Monoamine Oxidase B Promoter in Human Neuronal Cells*
Monoamine oxidase (MAO) B deaminates a number of biogenic and dietary amines and plays an important role in many biological processes. Among hormonal regulations of MAO B, we have recently found that retinoic acid (RA) significantly activates both MAO B promoter activity and mRNA expression in a human neuroblastoma BE(2)C cell line. RA activates MAO B promot
American Society for Biochemistry and Molecular Biology.