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| Registros recuperados: 35 | |
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| Awad, Hassan. |
| Although the determination of hydrocarbons in the marine environment is based usually on the same analytical steps, organic solvents extraction, column chromatography purification, and means for hydrocarbons detection and identification, the variations in the equipment and solvent systems included in the different established techniques hinder to obtain a global idea about the oil contamination state of the seas. Many authors and conferences declared the necessity of carrying out a comparative study on the efficiencies of the various published analytical techniques in this field. According to the facilities available in the laboratory, 25 applications of 16 published techniques were applied on a fixed weight of unique sample of sediments, mussels, fishes,... |
| Tipo: Text |
Palavras-chave: Analytical techniques; Hydrocarbons; Fluorescence spectroscopy. |
| Ano: 1977 |
URL: http://archimer.ifremer.fr/doc/1977/publication-1990.pdf |
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| Chouba, L.; Mzougui-Aguir, N.. |
| Dans l’objectif de déterminer l’état de la contamination organique et inorganique des sédiments superficiels de la frange côtière du golfe de Gabès, nous avons évalué les concentrations en hydrocarbures aromatiques totaux, en cadmium (Cd), en plomb (Pb) et en mercure (Hg). L’échantillonnage a été effectué à bord d’une barque motorisée, à l’aide d’une benne Van Veen au niveau de 25 stations. Les concentrations du Cadmium et du Plomb ont été déterminées par Spectrométrie d’Absorption Atomique à Four Graphite (Varian 220Z) alors que pour le Mercure les analyses ont été réalisées par Spectrométrie d’Absorption Atomique à vapeur froide. Les hydrocarbures totaux ont été analysés par UV-Fluorescence (UV-F). Les concentrations du Cadmium et du Mercure dans la... |
| Tipo: Journal Contribution |
Palavras-chave: Cadmium; Coastal waters; Hydrocarbons; Lead; Marine pollution; Mercury; Pollution monitoring; Sediments; Trace metals. |
| Ano: 2006 |
URL: http://hdl.handle.net/1834/4275 |
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| URRUTIA,ROBERTO; KOEN,SABBE; CRUCES,FABIOLA; POZO,KARLA; BECERRA,JOSE; ARANEDA,ALBERTO; VYVERMAN,WIM; PARRA,OSCAR. |
| Diatom, hydrocarbons and fatty acid sedimentary records were used for reconstructing the recent (last 150 years) palaeolimnological history of Laguna Chica of San Pedro (Concepción, VIII Región, Chile). Cluster analyses (Constrained Incremental Sum of Squares) on the diatom data revealed three distinct periods. The first period (1883-1940's) showed a pronounced increase in sedimentation rate and a slight increase in organic matter accumulation. In this period, eutrophic species (Aulacoseira granulata and Staurosira construens) became increasingly dominant. From the 1940s until the 1970s the diatom signal is more equivocal: after the initial decrease in the relative abundance of A. granulata and S. construens their numbers fluctuate without a clear pattern.... |
| Tipo: Journal article |
Palavras-chave: Diatoms; Hydrocarbons; Fatty acids; Paleolimnology; Land use. |
| Ano: 2000 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2000000400014 |
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| Simonato,Juliana D.; Fernandes,Marisa N.; Martinez,Cláudia B. R.. |
| The purpose of this work was to evaluate the effects of the water-soluble fraction of gasoline (WSFG) on the Neotropical freshwater fish Prochilodus lineatus. The WSFG was prepared by mixing gasoline in water (1:4) and animals were exposed for 6, 24 and 96h to 5% diluted WSFG or only to water. After exposure, blood was collected from the caudal vein and the gills were removed. The following parameters were analyzed: hematological (hemoglobin, hematocrit, number of red blood cells), osmo-ionic (plasma Na+, Cl- and K+ and plasma osmolarity), metabolic (total plasma proteins and glucose), endocrine (cortisol), density and distribution of chloride cells [CC] in the gills (immunohistochemistry), and branchial Na+/K+-ATPase (NKA) activity. Hemolysis was found to... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Chloride cells; Hematology; Hydrocarbons; Na+K+-ATPase; Osmoregulation; Stress response. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252013000300683 |
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| Chalén, F.. |
| Los hidrocarburos fueron investigados en el área costera del Litoral Ecuatoriano bajo el proyecto ODEPLAN del INP. La información evaluada corresponde al mes de octubre del 2003. Se programaron un total de 42 sitios para el muestreo de sedimentos de fondo, los cuales fueron demarcados con un GPS (Global Positional System). Las muestras de sedimentos fueron colectadas utilizando draga Van Veen, las mismas que fueron analizadas de acuerdo a la metodología señalada por UNIESCO/COI/PNUMA y leídas por Espectrofluometría. La zona mayormente monitoreada fue la Subárea A correspondiente al estuario externo del Golfo de Guayaquil, la misma que no se encontró significativamente contaminada, seguida de las Subáreas B y C, puesto que la mayoría de las concentraciones... |
| Tipo: Journal Contribution |
Palavras-chave: Hydrocarbons; Sediments; Organic compounds; Pollution; Hydrocarbon analysis. |
| Ano: 2010 |
URL: http://hdl.handle.net/1834/5373 |
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| Ximenes,A.A; Oliveira,G.A; Bittencourt-Cunha,P; Tomokyo,M; Leite,D.B; Folly,E; Golodne,D.M; Atella,G.C. |
| Lipid transport in arthropods is achieved by highly specialized lipoproteins, which resemble those described in vertebrate blood. Here we describe purification and characterization of the lipid-apolipoprotein complex, lipophorin (Lp), from adults and larvae of the cowpea weevil Callosobruchus maculatus. We also describe the Lp-mediated lipid transfer to developing oocytes. Lps were isolated from homogenates of C. maculatus larvae and adults by potassio bromide gradient and characterized with respect to physicochemical properties and lipid content. The weevil Lp (465 kDa) and larval Lp (585 kDa), with hydrated densities of 1.22 and 1.14 g/mL, contained 34 and 56% lipids and 9 and 7% carbohydrates, respectively. In both Lps, mannose was the predominant... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Callosobruchus maculatus; Lipophorin; Lipid transport; Oogenesis; Hydrocarbons. |
| Ano: 2008 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2008000100004 |
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| Mesa Mesa,Liliana; Falcón Hernández,José; Mulet De los Reyes,Alexander; Castellanos González,Juan Ramón. |
| ABSTRACT The coasts of Cuba are exposed to damage caused by the contamination by petroleum hydrocarbons. The coastal strip of the Gulf of Santiago de Cuba is an example of natural resources deterioration due to this contamination, which appears as one of its main environmental problems. In the present work, using gas chromatography, quantitative and qualitative analysis were performed based on the retention time values and the area under the chromatogram curve, which allowed characterizing the degree of contamination at four points of the bay of Santiago de Cuba: playa La Estrella (P1), “Guillermón Moncada” Port (P2) “Hermanos Díaz” Oil Refinery (P3), “Antonio Maceo” Thermoelectric Power Plant RENTE (P4). Retention times of individual peaks in... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Pollution; Hydrocarbons; Bay; Gas chromatography.. |
| Ano: 2021 |
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0122-97612021000100091 |
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| Ammar, M.S.A.; Ghobashi, A.A.; Omran, M.A.; Shaaban, A.M.. |
| Using Using SCUBA diving, surveying the coral reef communities at four sites, Red Sea Egypt was done. These sites are: Ras El Behar (polluted by petroleum oil), El-Hamraween (impacted by phosphate shipping), Shabrour Umm Gam’ar (harmed by recreational activities and has been suffering from the outbreak of Acanthaster planci during 1998) and Kalawy (a control site). The skeletal growth of the coral Stylophora pistillata was promoted greatly at the expense of other corals, in presence of chronic oil pollution (Ras El-Behar). In contrast, this species was completely suppressed in presence of phosphate and sulphur enrichment. Petroleum oil led to coral scarcity, space monopolization by one coral and increased sea urchins and algae. Coral reefs enriched with... |
| Tipo: Journal Contribution |
Palavras-chave: Field Study; Coral reefs; Hydrocarbons; Phosphates; Coral reefs; Hydrocarbons; Phosphates; Http://aims.fao.org/aos/agrovoc/c_1880; Http://aims.fao.org/aos/agrovoc/c_3719; Http://aims.fao.org/aos/agrovoc/c_35986. |
| Ano: 2007 |
URL: http://hdl.handle.net/1834/1909 |
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| Алёмов, С. В.; Бурдиян, Н. В.; Гусева, Е. В.; Шадрина, Т. В.; Енина, Л. В.; Сосновская, Р. В.; Волков, Н. Г.; Тихонова, Е. А.. |
| Проанализировано распределения бактерио-, мейо- и макрозообентоса в зависимости от физико-химических характеристик донных осадков бухты Южная (г. Севастополь, Чёрное море). Содержание нефтяных углеводородов составляло 607,2 – 1458,0 мг/100 г сух. осадка. В вершинной части бухты отмечено снижение концентраций нефтяных углеводородов. Общая численность гетеротрофных бактерий находилась в пределах 104 кл./г, плотность мейобентосного населения 9500 – 197800 экз./м2. Наибольшая средняя плотность мейобентоса приурочена к кутовой части бухты. Соотношение основных групп мейобентоса указывает на более благоприятные условия для существования мейобентосных организмов в вершине бухты. В составе макрозообентоса отмечен 31 таксон. Численность макрозообентоса не превышает... |
| Tipo: Journal Contribution |
Palavras-chave: Hydrocarbons; Benthos; Benthos; Hydrocarbons; Http://aims.fao.org/aos/agrovoc/c_878; Http://aims.fao.org/aos/agrovoc/c_3719. |
| Ano: 2007 |
URL: http://repository.ibss.org.ua/dspace/handle/99011/580 |
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| Registros recuperados: 35 | |
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