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| Registros recuperados: 10 | |
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| Bisognin,Dilson Antônio; Luz,Leandro Vinícius da; Lencina,Kelen Haygert; Santos,Clarissa Obem dos; Sautter,Cláudia Kaehler. |
| Abstract: The objective of this work was to evaluate different solvents and times in the ultrasound-assisted extraction of polyphenols, in order to quantify the total phenolic and flavonoid contents in and the antioxidant activity of mate (Ilex paraguariensis) leaves. The experiment was carried out in a completely randomized design, in a 8x3 (solvent x time of extraction) factorial arrangement. The solvent extractors were distilled water and aqueous solutions of ethanol, acetone, and methanol, acidified or not with hydrochloric acid, and the time of ultrasound-assisted extractions were 15, 30, and 45 min. All extractions were finished with a mechanical agitation of 30 min. Samples treated with acidified hydroalcoholic solvents resulted in higher values of... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Mate; Polarity; Polyphenols; Solvents. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2019000101601 |
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| Stancu,Mihaela Marilena. |
| ABSTRACT The aim of this study was to investigate the solvent tolerance mechanisms in Serratia marcescens strain IBBPo15 (KT315653). Serratia marcescens IBBPo15 exhibited remarkable solvent-tolerance, being able to survive in the presence of high concentrations (above 40%) of toxic organic solvents, such as cyclohexane, n-hexane, n-decane, toluene, styrene, and ethylbenzene. S. marcescens IBBPo15 produced extracellular protease and the enzyme production decreased in cells exposed to 5% cyclohexane, n-hexane, toluene, styrene, and ethylbenzene, as compared with the control and n-decane exposed cells. S. marcescens IBBPo15 cells produced carotenoid pigments and alteration of pigments profile (i.e., phytoene, lycopene) were observed in cells exposed to 5%... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Serratia marcescens; Solvents; Tolerance; Mechanisms. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132016000100704 |
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| Slunge, Daniel; Sterner, Thomas. |
| This paper studies the Swedish prohibition of the hazardous solvent Trichloroethylene (TCE). Sweden is alone in completely prohibiting its use. The ban has been at best a partial success and illustrates the dilemmas of policymaking. Use has declined but not stopped, largely because the decision to ban TCE was challenged in the courts. Recently, the EU Court of Justice decided in favor of Sweden's right to have a ban. This article analyzes abatement cost data to show that the cost of replacing TCE is low for most plants, although there appear to be a few firms for which it may be quite high. A cross-country comparison indicates that the Swedish ban was less effective than the very strict technical requirements in Germany or the tax used in Norway. A tax (or... |
| Tipo: Working or Discussion Paper |
Palavras-chave: Hazardous chemicals; Regulation; Environmental tax; Solvents; Environmental Economics and Policy; D62; L50; Q28; K32. |
| Ano: 2001 |
URL: http://purl.umn.edu/10516 |
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| Lourenço da Silva,A.; Elisabetsky,E.. |
| Experimental drugs and/or plant extracts are often dissolved in solvents, including propylene glycol. Nevertheless, there is evidence for psychoactive properties of this alcohol. In this study we found that in the hole-board test 10% propylene glycol did not modify the head-dipping behavior. However, 30% propylene glycol induced an increase in the number of head-dips (46.92 ± 2.37 compared to 33.83 ± 4.39, P<0.05, ANOVA/Student-Newman-Keuls), an effect comparable to that obtained with 0.5 mg/kg diazepam (from 33.83 ± 4.39 to 54 ± 3.8, P<0.01, ANOVA/Student-Newman-Keuls). These results demonstrate that 30% propylene glycol has significant anxiolytic effects in this model and therefore cannot be used as an innocuous solvent. |
| Tipo: Info:eu-repo/semantics/other |
Palavras-chave: Screening; Anxiolytic drugs; Propylene glycol; Diazepam; Solvents; Hole-board. |
| Ano: 2001 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2001000400016 |
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| Stancu,Mihaela Marilena. |
| Abstract Recently, there has been a lot of interest in the utilization of rhodococci in the bioremediation of petroleum contaminated environments. This study investigates the response of Rhodococcus erythropolis IBBPo1 cells to 1% organic solvents (alkanes, aromatics). A combination of microbiology, biochemical, and molecular approaches were used to examine cell adaptation mechanisms likely to be pursued by this strain after 1% organic solvent exposure. R. erythropolis IBBPo1 was found to utilize 1% alkanes (cyclohexane, n-hexane, n-decane) and aromatics (toluene, styrene, ethylbenzene) as the sole carbon source. Modifications in cell viability, cell morphology, membrane permeability, lipid profile, carotenoid pigments profile and 16S rRNA gene were... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Rhodococcus; Solvents; Morphology; Lipids; Carotenoids. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822015000401009 |
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| Quintero,Nathalia; Stashenko,Elena E.; Fuentes,Jorge Luis. |
| In this work, the toxicity and genotoxicity of organic solvents (acetone, carbon tetrachloride, dichloromethane, dimethylsulfoxide, ethanol, ether and methanol) were studied using the SOS chromotest. The influence of these solvents on the direct genotoxicity induced by the mutagens mitomycin C (MMC) and 4-nitroquinoline-1-oxide (4-NQO) were also investigated. None of the solvents were genotoxic in Escherichia coli PQ37. However, based on the inhibition of protein synthesis assessed by constitutive alkaline phosphatase activity, some solvents (carbon tetrachloride, dimethylsulfoxide, ethanol and ether) were toxic and incompatible with the SOS chromotest. Solvents that were neither toxic nor genotoxic to E. coli (acetone, dichloromethane and methanol)... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Antigenotoxicity; Genotoxicity; Interference; Mitomycin C; 4-nitro-quinoline-1-oxide; SOS chromotest; Solvents; Vitamin E. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572012000300018 |
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| Registros recuperados: 10 | |
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