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1-O-Alkylglyceryl Ether Lipids of the Gut Walls and Contents of an Abyssal Holothurian (Oneirophanta mutabilis)

Santos, Vera L. C. S.; Billett, David S. M.; Wolff, George A. (Brasil, 2002)

A study of the glyceryl ether composition of free lipids of gut walls and contents of an abyssal holothurian species, Oneirophanta mutabilis has been carried out. A series of saturated and unsaturated 1-O-alkylglyceryl ...
2-(2-Thiazolylazo)-p-cresol (TAC) as a reagent for the spectrophotometric determination of indium(III)

Ferreira, Sergio Luis Costa; Costa, Antonio Celso Spinola; Andrade, H. A. S. (Microchemical Journal, 1991)

The reaction between indium(III) and the 2-(2-thiazolylazo)-p-cresol (TAC) in aqueous methanol media at apparent pH 5.0–6.0 results in an intensely colored complex which is stable for at least 2 h. The composition is 1:2 ...
2-(2-Thiazolylazo)-p-Cresol (TAC) as a Reagent for the Spectrophotometric Determination of Titanium (IV)

Ferreira, Sergio Luis Costa; Costa, Antonio Celso Spinola; Andrade, Henrique A. S. (Mikrochim. Acta, 1993)

The reaction between titanium(IV) and 2-(2-thiazolylazo)-p-cresol- (TAC) in aqueous methanol media at apparent pH 4.0-5.6 results in a intensely coloured complex that is stable for at least 2 h. The combining ratio is 1 : ...
2-(2-Thiazolylazo)-p-cresol as a spectrophotometric reagent for vanadium determination in the presence of ascorbic acid

Teixeira, Leonardo Sena Gomes; Costa, Antonio Celso Spinola; Queiroz, Adriana Santana; Amorim, Adelaide Maria Mendonça; Bomfim, Osvaldo N.; Ferreira, Sergio Luis Costa (1998)

The present work describes the use of 2-(2-thiazolylazo)-p-cresol (TAC) as a spectrophotometric reagent for vanadium determination. TAC reacts with vanadium(IV) in the presence of ascorbic acid, forming a red complex with ...
A 2d model of the dynamic of the collision: i2-polymeric liquid surfaces of perfluorinatedpolyether (PFPE), polydimetilsiloxane (PDMS) and squalane

Leal, Alexandre Soares; Santos, Claudio Gouvea dos; Quintella, Cristina Maria Assis Lopes Tavares da Mata Hermida; Schor, Heloiza Helena Ribeiro (2007)

Este artigo apresenta um modelo em duas dimensões para o espalhamento de I2 pela superfície de líquidos poliméricos: poliéterperfluorado (PFPE), polidimentilsiloxano (PDMS) e esqualano. A função energia potencial adotada ...
2D QSAR studies on a series of bifonazole derivatives with antifungal activity

Mota, Sabrina G. R.; Barros, Tânia Fraga; Castilho, Marcelo Santos (2009)

Candida albicans (CA) é considerado como o principal patógeno oportunista em pacientes imunossuprimidos. A maior parte dos fármacos disponíveis para o tratamento de cepas resistentes são altamente tóxicos ou ineficazes. ...
4-Cyanopyridine and amide-N and amide-o linkage isomers of 4-pyridinecarboxamide on Trans-Chloro(1,4,8,11 tetraazacyclotetradecane)ruthenium(II/III)

Rocha, Zênis Novais da; Ferreira, Kleber Queiroz; Silva, Maristela; Oliveira, Érica Cristina de; Chiericato, Glaico; Tfouni, Elia (2001)

The synthesis, UV−vis spectra, and electrochemical behavior of the nitrile-bonded trans-[RuIICl(cyclam)(4-NCpyH+)](BF4)2 (4-Ncpy = 4-cyanopyridine; cyclam = 1,4,8,11-tetraazacyclotetradecane) and of trans-[RuIIICl(cyclam ...
7β-Oxygenated limonoids from Trichilia elegans ssp. elegans

Roque, Nídia Franca; Garcez, Fernanda R.; Garcez, Walmir S.; Castellano, Eduardo Ernesto; Zukerman Schpector, Julio (Elsevier, 2000-12)

Five 7β- and 7α-oxygenated obacunone-type limonoids were obtained on reinvestigation of the seeds of Trichilia elegans ssp. elegans: 7-deoxo-7β-acetoxykihadanins A and B, 7-deoxo-7β-hydroxykihadanins A and B and ...
A-type proanthocyanidin antioxidant from Dioclea lasiophylla

Barreiros, André Luís Bacelar Silva; David, Juceni Pereira de Lima; Queiroz, Luciano Paganucci de; David, Jorge Mauricio (Elsevier, 2000)

The A-type proanthocyanidin, epigallocatechin-(2β→7,4β→8)-epicatechin, together with the known epicatechin, luteolin 3′β-d-glucopyranoside, chrysoeriol 7β-d-glucopyranoside and 2-methylpentan-2,4-diol, were isolated from ...
About the SDS inclusion in PDMS/TEOS ORMOSIL: a vibrational spectroscopy and confocal Raman scattering study

Boaventura Filho, Jaime Soares; José, Nadia Mamede; Paschoal, A. R.; Ayala, Alejandro Pedro; Pinto, R. C. F.; Paschoal, C. W. A.; Tanaka, A. A. (2011)

Organically modified silicates (ORMOSILs) are attractive materials due to their vast applicability and easy synthesis. The doping of these materials with sodium dodecyl sulfate (SDS) is interesting in the search for good ...
Absolute Configurations and Enantiomeric Compositions of 2-Methyl-1-butanol and 2-Methyl-1-pentanol by 1H-NMR Spectrometry of their Diastereomeric Valine Esters

Andrade, Francisco A. de C. (1998)

Ésteres diastereoméricos da L-valina com o 2-methyl-1-butanol e o 2-methyl-1-pentanol foram examinados como derivados para a análise estereoquímica dos álcoois por ressonância magnética nuclear de prótons. A ausência de ...
Absolute Configuration and Enantiomeric Composition of Partially Resolved Mandelic, Atrolactic and Lactic Acids by 1H NMR of their (S)‑2‑Methylbutyl Esters

Andrade, Francisco A. de C.; Mendes, Maricleide P. de L.; Fonseca, Neuracy C. da (Journal of the Brazilian Chemical SocietyBrasil, 2013)

The mandelic, atrolactic and lactic acid esters of the (S)-2-methyl-1-butanol were examined as diastereomeric derivatives for the stereochemical analysis of the mentioned acids by 1H nuclear magnetic resonance (NMR) at 300 ...
Acetaldehyde and formaldehyde concentrations from sites impacted by heavy-duty diesel vehicles and their correlation with the fuel composition: Diesel and diesel/biodiesel blends

Rodrigues, Marina C.; Guarieiro, Lílian L. N.; Cardoso, Manuela Pedra; Carvalho, Luiz Souza; Rocha, Gisele Olímpio da; Andrade, Jailson Bittencourt de (2012)

The increasing of both industrialization and motorization of the world has led to a sharp rise in the demand for fossil fuels. Concern about the environmental impact caused by burning of these fuels has involved researchers ...
Acid and Superacid Solids for the Transformation of n-Butane

Oliveira, Alcineia Conceição; Essayem, Nadine; Tuel, Alain; Clacens, Jean-Marc; Taârit, Younes Ben (Reaction kinetics and catalysis letters, 2006)

Acid and superacid solids were evaluated in n-butane isomerization to produce isobutane. The combined dealumination and sulfatation of the starting Hmordenite zeolite improves the activity and selectivity of the catalyst.
Acidic Characterization of Copper Oxide and Niobium Pentoxide Supported on Silica–Alumina

Garcia, Fillipe Augusto da Costa; Braga, Valdeilson Souza; Dias, José Alves; Silva, Júnia Chaves Marinho e; Dias, Sílvia Cláudia Loureiro; Davo, Jorge L. B. (2007)

Copper oxide and niobium pentoxide were supported on silica–alumina with 2, 5, 10, 15 and 25 mass% loadings and 1:1 mass ratio of CuO:Nb2O5. XRD and BET measurements confirmed that monolayer coverage is reached with loadings ...
Acoplamento de cloreto de 4-nitrofenildiazônio com nucleófilos alifáticos: experimento integrado de síntese orgânica e cristalografia de raios X

Cunha, Silvio do Desterro; Marques, Monique F.; Rocha, Valéria; Lariucci, Carlito; Vencato, Ivo (Brasil, 2013)

This article describes an undergraduate experiment for the synthesis of p-nitrophenyldiazonium chloride and its coupling with acetylacetone and two enaminones, 4-phenylamino-pent-3-en-2-one and 4-amino-pent-3-en-2-one, in ...
Activity of nanocasted oxides for gas-phase dehydration of glycerol

Vasconcelos, Santiago J. S.; Lima, Cleanio L.; M. Filho, Josué; Oliveira, Alcemira Conceição; Barros, Eduardo B.; Sousa, Francisco F. de; Rocha, Maria da Graça Martins Carneiro da; Bargiela, Pascal; Oliveira, Alcineia Conceição (2011)

A series of nanocasted oxides were synthesised, and an analysis using basicity measurements provided evidence that low strength basic sites with high accessibility favoured the production of 1-hydroxyacetone from glycerol ...
Acute and persistent nociceptive paw sensitisation in mice: the involvement of distinct signalling pathways

Villarreal, Cristiane Flora; Funez, Mani I.; Figueiredo, Florêncio; Cunha, Fernando Q.; Parada, Carlos A.; Ferreira, Sérgio Henrique (Elsevier, 2009)

Aims Many fundamental pharmacological studies in pain and inflammation have been performed on rats. However, the pharmacological findings were generally not extended to other species in order to increase their predictive ...
Ação promotora do berílio em catalisadores da síntese do estireno

Barbosa, Mário Nilo Mendes; Carvalho, Marly Fernandes Araújo; Varela, Maria do Carmo Rangel Santos (1997)

Promotor action of beryllium in catalysts for styrene production. The catalytic dehydrogenation of ethylbenzene in presence of steam is the main commercial route to produce styrene. The industrial catalysts are potassium- ...
Ação promotora do zinco em catalisadores de síntese do estireno

Leite, Hugo Ernane Bonfim; Oliveira, Alcineia Conceição; Varela, Maria do Carmo Rangel Santos (2004)

Ethylbenzene dehydrogenation in the presence of steam is the main commercial route to produce styrene. The industrial catalyst is chromium and potassium-doped hematite, which easily deactivates with time due to potassium ...

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